pradyot kala - Academia.edu (original) (raw)

Papers by pradyot kala

Journal of critical reviews, 2019

International Journal of Rf and Microwave Computer-aided Engineering, Mar 27, 2020

A novel zeroth-order resonator (ZOR) meta-material (MTM) antenna with dualband is suggested using... more A novel zeroth-order resonator (ZOR) meta-material (MTM) antenna with dualband is suggested using compound right/left handed transmission line as MTM. In this article, suggested antenna consists of patch through series gap, two meander line inductors, and two circular stubs. The MTM antenna is compact in size which shows dual-band properties with first band centered at 2.47 GHz (2.05-2.89 GHz) and second band is centered at 5.9 GHz (3.70-8.10 GHz) with impedance bandwidth of (S 11 < − 10 dB) 34.69% and 72.45%, respectively. At ZOR mode (2.35 GHz), the suggested antenna has overall dimension of 0.197λ o × 0.07λ o × 0.011λ o with gain of 1.65 dB for ZOR band and 3.35 dB for first positive order resonator band which covers the applications like Bluetooth (2.4 GHZ), TV/Radio/Data (3.700-6.425 GHz), WLAN (5-5.16 GHz), C band frequencies (5.15-5.35, 5.47-5.725, or 5.725-5.875 GHz) and satellite communication (7.25-7.9 GHz). The radiation patterns of suggested structure are steady during the operating band for which sample antenna has been fabricated and confirmed experimentally. It exhibits novel omnidirectional radiation characteristics in phi = 0 plane with lower cross-polarization values.

Proceedings of SPIE, Apr 16, 1998

ABSTRACT Using the beat-length measurement technique an experimental method is described to deter... more ABSTRACT Using the beat-length measurement technique an experimental method is described to determine the modal birefringence characteristics of fundamental type of elliptical core polarization maintaining fibers.

ABSTRACT In recent years, the science of fractal geometry has grown into a vast area of knowledge... more ABSTRACT In recent years, the science of fractal geometry has grown into a vast area of knowledge, with almost all branches of science and engineering gaining from the new insights it has provided. In this paper modified Sierpinski fractal patch behavior has been presented and discussed. The antenna had a log periodic behavior, the log period being related to the self-similarity scale factor of the antenna. These are simulated using IE3D and analyzed in order to obtain the better understanding of antenna fractal behavior. In the Improved Design, to increase the radiating area, small triangles are drawn outside on three sides of each equilateral triangle. So total side length has been increased from 27mm to 45 mm. Now the total perimeter for improved design is 135 mm as it was for conventional antenna 81mm, keeping the antenna size same. The Sierpinski fractal antenna with wide band behavior characteristics has been successfully designed and implemented. The proposed fractal antenna has been designed with fifth iteration. The results exhibits the wide band characteristics in the range from 2.9 GHz to 4.1 GHz corresponds to 45.47% improvement in bandwidth as it is 36.37 % for the conventional antenna. The measured radiation of the proposed antenna is linearly polarized and stable throughout the band.The antenna has smooth VSWR characteristics in the band 2.95 GHz to 3.7 GHz. It has VSWR value i.e. 1.544 for improved design, as it was for conventional antenna 1.566 at 2.95 GHz. There is 2.2 % improvement in VSWR.

The objective of this work is to develop a simple method to calculate the input impedance and rad... more The objective of this work is to develop a simple method to calculate the input impedance and radiation pattern of short-circuited quarter wavelength long cylindrical-rectangular microstrip patch antenna. It is also to study the effect of the size of cylinder as well as the parameters of dielectric substrate. In this study we would like to take into account the problems of resonance and radiation of a short-circuited quarter wavelength cylindrical-rectangular microstrip patch antenna. Transmission line model is used to calculate the input impedance of the patch, while the combination of array theory and cavity model is used to calculate its radiation pattern. The volume covered by electric and magnetic walls change with radius of the magnetic plane. It is observed that the beam-width, resonant frequency, and resonant resistance decrease with cylinder radius. Peak radiated power increases with cylinder radius, but beyond the critical angle, radiated power decreases with cylinder radius. Critical angle increases with cylinder radius and substrate permittivity. It is also observed that difference of peak radiated power decreases with substrate permittivity, and power radiation beyond 90 0 is possible for cylindrical rectangular patch. The bandwidth is not sensitive to curvature but it decreases as substrate permittivity increases.

Lecture notes in electrical engineering, Jun 9, 2018

This paper presents a wideband antenna for millimeter-wave application. In modern era, all wirele... more This paper presents a wideband antenna for millimeter-wave application. In modern era, all wireless devices are multipurpose and versatile, so this requires a wideband antenna to perform different tasks. A single antenna is used rather than more antennas in a device, to reduce the size and cost of the device. Proposed antenna has a wide bandwidth of operating frequency bandwidth at 31.47–38.9 GHz, respectively. Gain about 7 dBi with voltage standing wave ratio (VSWR) is less than 2 at operating frequency 35.8 GHz. Design is simulated by high-frequency structural simulator (HFSS).

The objective of this paper is to develop a comparative analysis of rectangular and triangular cy... more The objective of this paper is to develop a comparative analysis of rectangular and triangular cylindrical microstrip patch antenna. In this study we would like to take into account the problems of resonance and radiation of cylindrical rectangular and triangular microstrip patch antenna. Design procedure involves parameters related to cylindrical microstrip elements to realize the desired resonant frequency, input impedance, radiation patterns etc. Transmission line model is used to calculate the input impedance of the patch, while cavity model is used to calculate its radiation pattern. For a cylindrical-rectangular microstrip antenna, it is observed that the beam-width, resonant frequency, and resonant resistance decrease with cylinder radius. The bandwidth is not sensitive to curvature but it decreases as substrate permittivity increases. Triangular microstrip antennas are a good substitute for rectangular microstrip antennas, especially in microstrip array designs, due to their similar radiation properties and because the triangular patch is physically smaller than the rectangular patch

2016 11th International Conference on Industrial and Information Systems (ICIIS)

This paper proposes a novel class of conformal antenna having a triangular patch fabricated over ... more This paper proposes a novel class of conformal antenna having a triangular patch fabricated over a cylindrical surface for 4.78 GHz frequency application. Antenna is designed using Teflon in order to achieve the highest possible characteristics like gain and return loss with ease in conformal antenna designing. The motivation for this work was to devise a radiation element which has ability to conform to cylindrical shapes and for flexible BAN (Body area Network) and RFID applications. Also, this paper shows the advantage of triangular patch antenna as compared to rectangular patch design when fabricated on cylindrical substrate. We show that Teflon is not only cost efficient, as compare to other substrates, but also, shows good radiation characteristics with respect to simulated results and has tolerable limitations for operating temperature and excitation. Full wave approach is used to study designing equations for the radiating conformal patch. Finally, some numerical and graphical results are simulated and presented for the discussed application.

Lecture Notes in Electrical Engineering, 2018

An investigation into the design of Giuseppe Peano fractal patch antenna and reactive impedance s... more An investigation into the design of Giuseppe Peano fractal patch antenna and reactive impedance surface (RIS) is presented in this study. We investigate the properties and possibilities of application of RIS-based Giuseppe Peano fractal geometry for the antenna miniaturization, bandwidth increment, gain improvement, resonance frequency decrement and return loss decrement of microstrip patch antennas and compare its performance with those of the simple rectangular antenna. RIS has been realized using two-dimensional metallic patches printed on a metal-grounded substrate. The fractal antenna not only has a large effective length, but the contours of its shape can generate a capacitance or inductance that can help to match the antenna to the circuit. RIS is equal to the parallel combination of inductor and capacitor. RIS increases the equivalent value of inductor and capacitor; hence, the resonance frequency decrease, bandwidth increase and antenna radiation performance improved significantly.

Design Engineering, Sep 24, 2019

INFORMATION TECHNOLOGY IN INDUSTRY, 2021

This paper presents a combination of an inductive coupling technique and coplanar ground plane mi... more This paper presents a combination of an inductive coupling technique and coplanar ground plane microstrip filter. Here, inductive coupling technique is used to overcome the unwanted radiation loss generated by the gap between the co-planar ground plane and the transmission line which improves filter characteristics. A defected ground structure (DGS) is integrated with the proposed filter to achieve a tri-bandpass characteristic (1.85, 3.53, and 5 GHz) without hampering the filter performance. The experimental results of the proposed filter are found in good agreement with simulated results.

Lecture Notes in Electrical Engineering, 2018

This paper presents a wideband antenna for millimeter-wave application. In modern era, all wirele... more This paper presents a wideband antenna for millimeter-wave application. In modern era, all wireless devices are multipurpose and versatile, so this requires a wideband antenna to perform different tasks. A single antenna is used rather than more antennas in a device, to reduce the size and cost of the device. Proposed antenna has a wide bandwidth of operating frequency bandwidth at 31.47–38.9 GHz, respectively. Gain about 7 dBi with voltage standing wave ratio (VSWR) is less than 2 at operating frequency 35.8 GHz. Design is simulated by high-frequency structural simulator (HFSS).

In this paper, the effect of curvature of the host plane on radiation of an equilateral triangula... more In this paper, the effect of curvature of the host plane on radiation of an equilateral triangular microstrip patch antenna (ETMSA) was studied. Here, cavity model is used to find electric field components at the edge of the patch while aperture method is used for the calculation of radiation pattern. Curvature of host plane hardly affects broadside (XZ-plane) radiation pattern of ETMSA while a significant effect was observed on its radiation pattern along cylindrical ground axis (YZ-plane).

AEU - International Journal of Electronics and Communications, 2021

Abstract A compact short ended coplanar waveguide (CPW) feed dual-band antenna encouraged with me... more Abstract A compact short ended coplanar waveguide (CPW) feed dual-band antenna encouraged with metamaterial using composite right/left-handed transmission line (CRLH - TL) technique presented here. The antenna designed to operate at series resonance as the performance of the antenna categorised by the combination of series (Lse, Cse) elements. This proposed antenna embraces two novel hexagonal ring resonators (HRR) connected to patch in order to excite higher-order modes, results in bandwidth expansion from 53.2% (fc = 7.03 GHz) to 84.07% (fc = 8.29 GHz). In addition to this, antenna is compact with an electrical size of 0.149 λ 0 × 0.22 λ 0 × 0.01 λ 0 at f 0 = 2.23 GHz. The simulated averaged radiation efficiencies of the proposed antenna throughout the first band and the second band are 85.3% and 93.2% respectively. Also, the measured result indicates that the antenna intended to operate over the frequency bands 2.19 – 2.33 GHz and 4.83 – 10.87 GHz with 10dB fractional bandwidth of 5.73% and 74.54% respectively with a measured peak gain of 1.29dB at 2.23 GHz and 4.81dB at 7.7 GHz. It observed that the measured results are worthy promising with the simulated one. Due to these attributes, the proposed antenna is an aspirant for recent wireless communication like Bluetooth, WLAN/Wi-Fi band, HiperLAN1 (5.15–5.3 GHz), HiperLAN2 (5.47–5.72 GHz) and for X – Band Applications.

International Journal of RF and Microwave Computer-Aided Engineering, 2020

A novel zeroth-order resonator (ZOR) meta-material (MTM) antenna with dualband is suggested using... more A novel zeroth-order resonator (ZOR) meta-material (MTM) antenna with dualband is suggested using compound right/left handed transmission line as MTM. In this article, suggested antenna consists of patch through series gap, two meander line inductors, and two circular stubs. The MTM antenna is compact in size which shows dual-band properties with first band centered at 2.47 GHz (2.05-2.89 GHz) and second band is centered at 5.9 GHz (3.70-8.10 GHz) with impedance bandwidth of (S 11 < − 10 dB) 34.69% and 72.45%, respectively. At ZOR mode (2.35 GHz), the suggested antenna has overall dimension of 0.197λ o × 0.07λ o × 0.011λ o with gain of 1.65 dB for ZOR band and 3.35 dB for first positive order resonator band which covers the applications like Bluetooth (2.4 GHZ), TV/Radio/Data (3.700-6.425 GHz), WLAN (5-5.16 GHz), C band frequencies (5.15-5.35, 5.47-5.725, or 5.725-5.875 GHz) and satellite communication (7.25-7.9 GHz). The radiation patterns of suggested structure are steady during the operating band for which sample antenna has been fabricated and confirmed experimentally. It exhibits novel omnidirectional radiation characteristics in phi = 0 plane with lower cross-polarization values.

Journal of Circuits, Systems and Computers, 2020

In this paper, we discussed about the work done by researchers for the enhancement of performance... more In this paper, we discussed about the work done by researchers for the enhancement of performance of a multiband BPF by introducing different defected ground structure (DGS) geometries. A DGS structure on a conventional inductively coupled band pass filter is used to miniaturize the resonator. By introducing a DGS on the transversal dimension of the CPW, it enhances filter performance. The DGS cell also transforms a single band to a multiband BPF by using this structure. The design technique of the filters with the DGS can be explained at very high frequencies in GHz ranges and give very accurate simulated and measured results.

International Journal of RF and Microwave Computer-Aided Engineering, 2019

In this article, a novel omnidirectional compact dual band metamaterial-inspired antenna with CPW... more In this article, a novel omnidirectional compact dual band metamaterial-inspired antenna with CPW feed has been proposed for application of GSM 1800 (1.71-1.785 GHz/1.805-1.879 GHz), GSM 1900 (1.85-1.91 GHz/1.93-1.99 GHz), UMTS (1.92-2.17 GHz), WLAN/Wi Fi (4.9, 5, 5.9 GHz), HiperLAN1 (5.15-5.3 GHz), and HiperLAN2 (5.47-5.72 GHz) using a combination of meander line inductor and interdigital capacitor (IDC). The antenna consists of complimentary right/left handed (CRLH) transmission line on both sides of patch to excite zeroth order mode (n = 0).

Journal of Information and Optimization Sciences, 2019

In this paper an efficient high performing cost-effective, compact size BPF is designed for wirel... more In this paper an efficient high performing cost-effective, compact size BPF is designed for wireless application is designed. There are various technologies have been introduced from time to time to address these concerns which also include those in the field of microwave filters like Photonic Band Gap structures (PBG), defected ground structures (DGS), fractals, metamaterial and so on to resonate for multiband frequencies. The simulated structure resonates at 1.

This paper presents a theoretical study of the different characteristics of an L-probe fed planar... more This paper presents a theoretical study of the different characteristics of an L-probe fed planar rectangular microstrip patch antenna mounted on a cylindrical ground structure. A transmission line model is used for the calculation of its input impedance. The radiation pattern of the structure is obtained by aperture method. Effect of ground curvature and different parameters of L-probe (vertical length) are studied. It is found that L-probe provides a wide-band impedance bandwidth which is further enhanced by mounting the patch on a cylindrical ground plane. A curved grounding structure can increase the 3 dB beamwidth of a planar-rectangular patch. Theoretical results are compared with existing experiments results and a very good agreement is observed.

This paper presents the designing of a rectangular microstrip antenna using Multi Layer Preceptro... more This paper presents the designing of a rectangular microstrip antenna using Multi Layer Preceptron (MLP) neural network model. The model was trained for 40 set of input-output (length of patch-resonant frequency) parameters. The output error and time delay (no. of epochs) were optimized by changing the learning rate and momentum term. In case of testing the output of the present model (resonant frequency) is found in good agreement with theoretical results.

Journal of critical reviews, 2019

International Journal of Rf and Microwave Computer-aided Engineering, Mar 27, 2020

A novel zeroth-order resonator (ZOR) meta-material (MTM) antenna with dualband is suggested using... more A novel zeroth-order resonator (ZOR) meta-material (MTM) antenna with dualband is suggested using compound right/left handed transmission line as MTM. In this article, suggested antenna consists of patch through series gap, two meander line inductors, and two circular stubs. The MTM antenna is compact in size which shows dual-band properties with first band centered at 2.47 GHz (2.05-2.89 GHz) and second band is centered at 5.9 GHz (3.70-8.10 GHz) with impedance bandwidth of (S 11 < − 10 dB) 34.69% and 72.45%, respectively. At ZOR mode (2.35 GHz), the suggested antenna has overall dimension of 0.197λ o × 0.07λ o × 0.011λ o with gain of 1.65 dB for ZOR band and 3.35 dB for first positive order resonator band which covers the applications like Bluetooth (2.4 GHZ), TV/Radio/Data (3.700-6.425 GHz), WLAN (5-5.16 GHz), C band frequencies (5.15-5.35, 5.47-5.725, or 5.725-5.875 GHz) and satellite communication (7.25-7.9 GHz). The radiation patterns of suggested structure are steady during the operating band for which sample antenna has been fabricated and confirmed experimentally. It exhibits novel omnidirectional radiation characteristics in phi = 0 plane with lower cross-polarization values.

Proceedings of SPIE, Apr 16, 1998

ABSTRACT Using the beat-length measurement technique an experimental method is described to deter... more ABSTRACT Using the beat-length measurement technique an experimental method is described to determine the modal birefringence characteristics of fundamental type of elliptical core polarization maintaining fibers.

ABSTRACT In recent years, the science of fractal geometry has grown into a vast area of knowledge... more ABSTRACT In recent years, the science of fractal geometry has grown into a vast area of knowledge, with almost all branches of science and engineering gaining from the new insights it has provided. In this paper modified Sierpinski fractal patch behavior has been presented and discussed. The antenna had a log periodic behavior, the log period being related to the self-similarity scale factor of the antenna. These are simulated using IE3D and analyzed in order to obtain the better understanding of antenna fractal behavior. In the Improved Design, to increase the radiating area, small triangles are drawn outside on three sides of each equilateral triangle. So total side length has been increased from 27mm to 45 mm. Now the total perimeter for improved design is 135 mm as it was for conventional antenna 81mm, keeping the antenna size same. The Sierpinski fractal antenna with wide band behavior characteristics has been successfully designed and implemented. The proposed fractal antenna has been designed with fifth iteration. The results exhibits the wide band characteristics in the range from 2.9 GHz to 4.1 GHz corresponds to 45.47% improvement in bandwidth as it is 36.37 % for the conventional antenna. The measured radiation of the proposed antenna is linearly polarized and stable throughout the band.The antenna has smooth VSWR characteristics in the band 2.95 GHz to 3.7 GHz. It has VSWR value i.e. 1.544 for improved design, as it was for conventional antenna 1.566 at 2.95 GHz. There is 2.2 % improvement in VSWR.

The objective of this work is to develop a simple method to calculate the input impedance and rad... more The objective of this work is to develop a simple method to calculate the input impedance and radiation pattern of short-circuited quarter wavelength long cylindrical-rectangular microstrip patch antenna. It is also to study the effect of the size of cylinder as well as the parameters of dielectric substrate. In this study we would like to take into account the problems of resonance and radiation of a short-circuited quarter wavelength cylindrical-rectangular microstrip patch antenna. Transmission line model is used to calculate the input impedance of the patch, while the combination of array theory and cavity model is used to calculate its radiation pattern. The volume covered by electric and magnetic walls change with radius of the magnetic plane. It is observed that the beam-width, resonant frequency, and resonant resistance decrease with cylinder radius. Peak radiated power increases with cylinder radius, but beyond the critical angle, radiated power decreases with cylinder radius. Critical angle increases with cylinder radius and substrate permittivity. It is also observed that difference of peak radiated power decreases with substrate permittivity, and power radiation beyond 90 0 is possible for cylindrical rectangular patch. The bandwidth is not sensitive to curvature but it decreases as substrate permittivity increases.

Lecture notes in electrical engineering, Jun 9, 2018

This paper presents a wideband antenna for millimeter-wave application. In modern era, all wirele... more This paper presents a wideband antenna for millimeter-wave application. In modern era, all wireless devices are multipurpose and versatile, so this requires a wideband antenna to perform different tasks. A single antenna is used rather than more antennas in a device, to reduce the size and cost of the device. Proposed antenna has a wide bandwidth of operating frequency bandwidth at 31.47–38.9 GHz, respectively. Gain about 7 dBi with voltage standing wave ratio (VSWR) is less than 2 at operating frequency 35.8 GHz. Design is simulated by high-frequency structural simulator (HFSS).

The objective of this paper is to develop a comparative analysis of rectangular and triangular cy... more The objective of this paper is to develop a comparative analysis of rectangular and triangular cylindrical microstrip patch antenna. In this study we would like to take into account the problems of resonance and radiation of cylindrical rectangular and triangular microstrip patch antenna. Design procedure involves parameters related to cylindrical microstrip elements to realize the desired resonant frequency, input impedance, radiation patterns etc. Transmission line model is used to calculate the input impedance of the patch, while cavity model is used to calculate its radiation pattern. For a cylindrical-rectangular microstrip antenna, it is observed that the beam-width, resonant frequency, and resonant resistance decrease with cylinder radius. The bandwidth is not sensitive to curvature but it decreases as substrate permittivity increases. Triangular microstrip antennas are a good substitute for rectangular microstrip antennas, especially in microstrip array designs, due to their similar radiation properties and because the triangular patch is physically smaller than the rectangular patch

2016 11th International Conference on Industrial and Information Systems (ICIIS)

This paper proposes a novel class of conformal antenna having a triangular patch fabricated over ... more This paper proposes a novel class of conformal antenna having a triangular patch fabricated over a cylindrical surface for 4.78 GHz frequency application. Antenna is designed using Teflon in order to achieve the highest possible characteristics like gain and return loss with ease in conformal antenna designing. The motivation for this work was to devise a radiation element which has ability to conform to cylindrical shapes and for flexible BAN (Body area Network) and RFID applications. Also, this paper shows the advantage of triangular patch antenna as compared to rectangular patch design when fabricated on cylindrical substrate. We show that Teflon is not only cost efficient, as compare to other substrates, but also, shows good radiation characteristics with respect to simulated results and has tolerable limitations for operating temperature and excitation. Full wave approach is used to study designing equations for the radiating conformal patch. Finally, some numerical and graphical results are simulated and presented for the discussed application.

Lecture Notes in Electrical Engineering, 2018

An investigation into the design of Giuseppe Peano fractal patch antenna and reactive impedance s... more An investigation into the design of Giuseppe Peano fractal patch antenna and reactive impedance surface (RIS) is presented in this study. We investigate the properties and possibilities of application of RIS-based Giuseppe Peano fractal geometry for the antenna miniaturization, bandwidth increment, gain improvement, resonance frequency decrement and return loss decrement of microstrip patch antennas and compare its performance with those of the simple rectangular antenna. RIS has been realized using two-dimensional metallic patches printed on a metal-grounded substrate. The fractal antenna not only has a large effective length, but the contours of its shape can generate a capacitance or inductance that can help to match the antenna to the circuit. RIS is equal to the parallel combination of inductor and capacitor. RIS increases the equivalent value of inductor and capacitor; hence, the resonance frequency decrease, bandwidth increase and antenna radiation performance improved significantly.

Design Engineering, Sep 24, 2019

INFORMATION TECHNOLOGY IN INDUSTRY, 2021

This paper presents a combination of an inductive coupling technique and coplanar ground plane mi... more This paper presents a combination of an inductive coupling technique and coplanar ground plane microstrip filter. Here, inductive coupling technique is used to overcome the unwanted radiation loss generated by the gap between the co-planar ground plane and the transmission line which improves filter characteristics. A defected ground structure (DGS) is integrated with the proposed filter to achieve a tri-bandpass characteristic (1.85, 3.53, and 5 GHz) without hampering the filter performance. The experimental results of the proposed filter are found in good agreement with simulated results.

Lecture Notes in Electrical Engineering, 2018

This paper presents a wideband antenna for millimeter-wave application. In modern era, all wirele... more This paper presents a wideband antenna for millimeter-wave application. In modern era, all wireless devices are multipurpose and versatile, so this requires a wideband antenna to perform different tasks. A single antenna is used rather than more antennas in a device, to reduce the size and cost of the device. Proposed antenna has a wide bandwidth of operating frequency bandwidth at 31.47–38.9 GHz, respectively. Gain about 7 dBi with voltage standing wave ratio (VSWR) is less than 2 at operating frequency 35.8 GHz. Design is simulated by high-frequency structural simulator (HFSS).

In this paper, the effect of curvature of the host plane on radiation of an equilateral triangula... more In this paper, the effect of curvature of the host plane on radiation of an equilateral triangular microstrip patch antenna (ETMSA) was studied. Here, cavity model is used to find electric field components at the edge of the patch while aperture method is used for the calculation of radiation pattern. Curvature of host plane hardly affects broadside (XZ-plane) radiation pattern of ETMSA while a significant effect was observed on its radiation pattern along cylindrical ground axis (YZ-plane).

AEU - International Journal of Electronics and Communications, 2021

Abstract A compact short ended coplanar waveguide (CPW) feed dual-band antenna encouraged with me... more Abstract A compact short ended coplanar waveguide (CPW) feed dual-band antenna encouraged with metamaterial using composite right/left-handed transmission line (CRLH - TL) technique presented here. The antenna designed to operate at series resonance as the performance of the antenna categorised by the combination of series (Lse, Cse) elements. This proposed antenna embraces two novel hexagonal ring resonators (HRR) connected to patch in order to excite higher-order modes, results in bandwidth expansion from 53.2% (fc = 7.03 GHz) to 84.07% (fc = 8.29 GHz). In addition to this, antenna is compact with an electrical size of 0.149 λ 0 × 0.22 λ 0 × 0.01 λ 0 at f 0 = 2.23 GHz. The simulated averaged radiation efficiencies of the proposed antenna throughout the first band and the second band are 85.3% and 93.2% respectively. Also, the measured result indicates that the antenna intended to operate over the frequency bands 2.19 – 2.33 GHz and 4.83 – 10.87 GHz with 10dB fractional bandwidth of 5.73% and 74.54% respectively with a measured peak gain of 1.29dB at 2.23 GHz and 4.81dB at 7.7 GHz. It observed that the measured results are worthy promising with the simulated one. Due to these attributes, the proposed antenna is an aspirant for recent wireless communication like Bluetooth, WLAN/Wi-Fi band, HiperLAN1 (5.15–5.3 GHz), HiperLAN2 (5.47–5.72 GHz) and for X – Band Applications.

International Journal of RF and Microwave Computer-Aided Engineering, 2020

A novel zeroth-order resonator (ZOR) meta-material (MTM) antenna with dualband is suggested using... more A novel zeroth-order resonator (ZOR) meta-material (MTM) antenna with dualband is suggested using compound right/left handed transmission line as MTM. In this article, suggested antenna consists of patch through series gap, two meander line inductors, and two circular stubs. The MTM antenna is compact in size which shows dual-band properties with first band centered at 2.47 GHz (2.05-2.89 GHz) and second band is centered at 5.9 GHz (3.70-8.10 GHz) with impedance bandwidth of (S 11 < − 10 dB) 34.69% and 72.45%, respectively. At ZOR mode (2.35 GHz), the suggested antenna has overall dimension of 0.197λ o × 0.07λ o × 0.011λ o with gain of 1.65 dB for ZOR band and 3.35 dB for first positive order resonator band which covers the applications like Bluetooth (2.4 GHZ), TV/Radio/Data (3.700-6.425 GHz), WLAN (5-5.16 GHz), C band frequencies (5.15-5.35, 5.47-5.725, or 5.725-5.875 GHz) and satellite communication (7.25-7.9 GHz). The radiation patterns of suggested structure are steady during the operating band for which sample antenna has been fabricated and confirmed experimentally. It exhibits novel omnidirectional radiation characteristics in phi = 0 plane with lower cross-polarization values.

Journal of Circuits, Systems and Computers, 2020

In this paper, we discussed about the work done by researchers for the enhancement of performance... more In this paper, we discussed about the work done by researchers for the enhancement of performance of a multiband BPF by introducing different defected ground structure (DGS) geometries. A DGS structure on a conventional inductively coupled band pass filter is used to miniaturize the resonator. By introducing a DGS on the transversal dimension of the CPW, it enhances filter performance. The DGS cell also transforms a single band to a multiband BPF by using this structure. The design technique of the filters with the DGS can be explained at very high frequencies in GHz ranges and give very accurate simulated and measured results.

International Journal of RF and Microwave Computer-Aided Engineering, 2019

In this article, a novel omnidirectional compact dual band metamaterial-inspired antenna with CPW... more In this article, a novel omnidirectional compact dual band metamaterial-inspired antenna with CPW feed has been proposed for application of GSM 1800 (1.71-1.785 GHz/1.805-1.879 GHz), GSM 1900 (1.85-1.91 GHz/1.93-1.99 GHz), UMTS (1.92-2.17 GHz), WLAN/Wi Fi (4.9, 5, 5.9 GHz), HiperLAN1 (5.15-5.3 GHz), and HiperLAN2 (5.47-5.72 GHz) using a combination of meander line inductor and interdigital capacitor (IDC). The antenna consists of complimentary right/left handed (CRLH) transmission line on both sides of patch to excite zeroth order mode (n = 0).

Journal of Information and Optimization Sciences, 2019

In this paper an efficient high performing cost-effective, compact size BPF is designed for wirel... more In this paper an efficient high performing cost-effective, compact size BPF is designed for wireless application is designed. There are various technologies have been introduced from time to time to address these concerns which also include those in the field of microwave filters like Photonic Band Gap structures (PBG), defected ground structures (DGS), fractals, metamaterial and so on to resonate for multiband frequencies. The simulated structure resonates at 1.

This paper presents a theoretical study of the different characteristics of an L-probe fed planar... more This paper presents a theoretical study of the different characteristics of an L-probe fed planar rectangular microstrip patch antenna mounted on a cylindrical ground structure. A transmission line model is used for the calculation of its input impedance. The radiation pattern of the structure is obtained by aperture method. Effect of ground curvature and different parameters of L-probe (vertical length) are studied. It is found that L-probe provides a wide-band impedance bandwidth which is further enhanced by mounting the patch on a cylindrical ground plane. A curved grounding structure can increase the 3 dB beamwidth of a planar-rectangular patch. Theoretical results are compared with existing experiments results and a very good agreement is observed.

This paper presents the designing of a rectangular microstrip antenna using Multi Layer Preceptro... more This paper presents the designing of a rectangular microstrip antenna using Multi Layer Preceptron (MLP) neural network model. The model was trained for 40 set of input-output (length of patch-resonant frequency) parameters. The output error and time delay (no. of epochs) were optimized by changing the learning rate and momentum term. In case of testing the output of the present model (resonant frequency) is found in good agreement with theoretical results.