Ravi Gangwar | Indian School of Mines, Dhanbad (original) (raw)
Papers by Ravi Gangwar
Present day heavy ion accelerators use bunched ion beams of sub-nanosecond time scale for beam ac... more Present day heavy ion accelerators use bunched ion beams of sub-nanosecond time scale for beam acceleration. In order to monitor its longitudinal profile, fast faraday Cups are employed. Owing to the advent of microstrip technology and its fabrication process, planar structures have become easier to fabricate. A novel design using the same is developed with a special provision for mounting edge launch connectors through a microstripline, followed by a microstrip to stripline transistion to again a microstrip structure in the beam interaction hole. The entire structure is a 50 Ω is bidirectional. An experimental study on via placement around central strip has also been conducted to not only ensure the field containment around the strip but also for bandwidth enhancement. To measure ion beam currents from 10-100 nA and a bunch width of 1ns, device has been beam interaction hole of around 10mm. 3 dB bandwidth is measured >6 GHz with a rise time of ~60 ps. The devices are also provid...
In this paper design and development of triangular dielectric resonator antenna (TDRA) has been i... more In this paper design and development of triangular dielectric resonator antenna (TDRA) has been investigated. The coaxial probe feed at the center of the ground plane has been used for excitation of the TDRA. For the fabrication 50 Ω coaxial probe has been fitted at the centre of ground plane. The input characteristics of the proposed antenna have been extracted through Ansoft HFSS simulation software, which are compared with experimental results. Also, the radiation characteristics of the proposed TDRA has been found through Ansoft HFSS simulation software and compared with experimental results. The simulated results have been in good agreement with experimental results. The near field distribution has been observed at resonant frequency 5.8 GHz. It is apparent from near field analysis that the coaxial probe excites TM10-1 dominant mode fields in the antenna elements. The proposed antenna provides nearly 10.34% bandwidth (S11| < −10 dB) at a resonant frequency of 5.8 GHz with 6....
2017 IEEE Conference on Antenna Measurements & Applications (CAMA), 2017
In this article, a wideband hybrid multiple input multiple output (MIMO) cylindrical dielectric r... more In this article, a wideband hybrid multiple input multiple output (MIMO) cylindrical dielectric resonator antenna (CDRA) is studied. The wideband isolation is achieved with the help of novel circular ring shaped defected ground structure. The proposed MIMO antenna operates in the frequency range 3.7GHz-7.25GHz. Isolation of proposed MIMO antenna (S12) is less than −17dB over the entire operating band. The proposed antenna is found suitable for WLAN and WiMAX applications.
IET Microwaves, Antennas & Propagation, 2020
This study explains a novel wideband curvilinear Sierpinski fractal geometry (CSFG) based cylindr... more This study explains a novel wideband curvilinear Sierpinski fractal geometry (CSFG) based cylindrical dielectric resonator antenna. CSFG provides wider bandwidth by the combination of two important concepts: (i) reduction in volume to the surface area of the complete radiating structure, which in turn reduces the Q-factor; (ii) generation of two radiating modes inside the radiating structure HEM 11δ and TM 01δ . The prototype of the proposed antenna is fabricated for verifying the simulated results. Measured reflection coefficient (| S 11 |) shows that the proposed antenna structure operates over the frequency range 2.2–3.5 GHz with the fractional bandwidth of 45.61%. Diversified radiation pattern, i.e. monopole (due to TM 01δ mode) and broadside (due to HEM 11δ mode) is also an important feature of the proposed antenna structure. The antenna design is relevant for WLAN (2.5 GHz) and WiMAX (3.3 GHz) applications.
AEU - International Journal of Electronics and Communications, 2021
Abstract A triple-band polarization-independent conformal absorber for C- and X-frequency bands h... more Abstract A triple-band polarization-independent conformal absorber for C- and X-frequency bands have been presented. The designed absorber comprises a Jerusalem cross resonator at the center, surrounded by a quarter part of a square rings resonator with different sizes at each corner on a metal grounded dielectric substrate. The unit cell size is 0.23λo× 0.23λo and thickness of λo/153 at frequency 6.16 GHz. The absorption peaks were obtained at frequencies 6.16 GHz, 9.22 GHz, and 11.6 GHz with absorptivity 95%, 96 %, and 97%, respectively. It exhibited full wave at half maximum (FWHM) bandwidths of 160 MHz bands (6.04 GHz – 6.20 GHz, 240 MHz (9.09 GHz – 9.33 GHz), and 260 MHz (11.57 GHz -11.83 GHz), respectively. The designed absorber is shown four-fold symmetry, which makes it polarization independent. Normalized impedance and surface current distributions for all three absorption frequencies are analyzed for understanding the absorption phenomenon. The designed absorber has been tested for the curved surfaces with different central angles to show its conformal behavior, and it is perceived that measured results and simulated results have good agreement between them.
Microwave and Optical Technology Letters, 2018
In this article, a dual-sense circularly polarized (CP) hybrid antenna is reported. The proposed ... more In this article, a dual-sense circularly polarized (CP) hybrid antenna is reported. The proposed hybrid antenna comprises of an asymmetrical square ring-shaped printed line and a rectangular dielectric resonator (RDR). The asymmetricity present in the square ring is responsible for creating CP radiation with the opposite sense characteristics in the proposed antenna. Also, modified printed ring is used to excite TE 111 mode in the loaded RDR. This loading enhances the overall impedance bandwidth of the proposed antenna. For practical verification, a prototype of the proposed antenna is fabricated and tested. The measured outcomes indicate a close concurrence with the simulated outcomes. The proposed antenna works over the frequency range 3.28 GHz-5.78 GHz with a fractional bandwidth of 55.18%. Dual CP wave with dual-sense characteristics (Axial Ratio < 3 dB) are created in the frequency range 3.81-4.28 GHz and 4.98-5.28 GHz respectively. These responses make the proposed antenna suitable for WLAN and WiMAX applications.
Microwave and Optical Technology Letters, 2018
AEU - International Journal of Electronics and Communications, 2018
IEEE Antennas and Wireless Propagation Letters, 2019
This work presents a novel partial reflector surface (PRS) structure to improve the isolation and... more This work presents a novel partial reflector surface (PRS) structure to improve the isolation and correlation coefficient values between cylindrical dielectric resonator antennas (cDRAs) for multiband multiple-input-multiple-output (MIMO) applications. To achieve multiband characteristics, three different groups of cDRA are proposed to cover 5.2 GHz, 5.5 GHz and 5.8 GHz bands, respectively. Each group has two cDRAs. So, three groups (i.e six cDRA) are placed at the top of the substrate and each cDRA is excited using a co-planer waveguide (CPW) fed conformal strip-line. To achieve improved isolation, three different phase gradient frequency selective surfaces (FSS) are designed which operate at 5.2 GHz, 5.5 GHz and 5.8 GHz bands, respectively. This phase gradient FSS is utilized as a superstrate above each group of DR elements. As a result, two different far-field patterns are achieved from each group of antenna elements which deliver improved isolation as well as low field correlation. This exclusive technique offers more than 12 dB of enhancement in isolation values and more than 70% improvement in envelope correlation coefficient (ECC) values, thus guaranteeing improved MIMO performance.
Microwave and Optical Technology Letters, 2018
IEEE Antennas and Propagation Magazine, 2018
IETE Technical Review, 2019
Journal of Circuits, Systems and Computers, 2018
The aim of the paper is to propose a design and analysis of multi-element multi-segment triangula... more The aim of the paper is to propose a design and analysis of multi-element multi-segment triangular dielectric resonator antenna (MEMS TDRA) with Radar Cross-Section (RCS). The proposed antenna has been excited through coaxial probe feed. The coaxial probe feed excites TM[Formula: see text] dominant mode fields within the TDR elements. A general guideline for wide bandwidth and high gain has been prepared for designing of MEMS TDRA. The model of the proposed MEMS TDRA has been studied through simulation (Ansoft HFSS software) and fabricated for measurement. The simulated antenna performance has good agreement with the measured one. The proposed MEMS TDRA performance has been compared with some similar type of previously published structure and found wider bandwidth and higher gain. The proposed MEMS TDRA provides monopole-like radiation pattern with nearly 39% bandwidth ([Formula: see text] dB). The average gain of 6.0 dBi has been found over the entire bandwidth. The RCS analysis ha...
IET Microwaves, Antennas & Propagation, 2018
This work presents a four-element, eight-port cylindrical dielectric resonator antenna (cDRA) wit... more This work presents a four-element, eight-port cylindrical dielectric resonator antenna (cDRA) with multi-directional pattern diversity for wireless access point applications. Initially, a dielectric resonator is fed by two different feeding techniques to create two simultaneous orthogonal patterns. This primary radiator is combined with similar radiators in a cross-configuration to obtain an eight-port multiple-input-multiple-output (MIMO) antenna system. The antenna elements are placed in such a way that each radiator of the proposed antenna can radiate in a different direction so that the field correlation between the antenna elements is minimum. The proposed diversity antenna consists of four antenna elements and eight polarised ports. Isolation between the ports is improved by generating orthogonal modes in each cDRA and exciting each cDRA to radiate in a different direction. The similarity in simulated and measured results confirm that the proposed eight-port diversity antenna is useful for the frequency ranges between 5.6 and 5.9 GHz for wireless local area network (WLAN) applications.
International Journal of RF and Microwave Computer-Aided Engineering, 2018
Progress In Electromagnetics Research C, 2016
In this article, a dual-polarized hybrid cylindrical dielectric resonator antenna (CDRA) is studi... more In this article, a dual-polarized hybrid cylindrical dielectric resonator antenna (CDRA) is studied. A ring-shaped patch along with an inverted L-strip is used to excite two different hybrid modes (HE 11δ and HE 12δ-like mode) in CDRA. HE 12δ mode in CDRA is very advantageous in terms of gain and radiation characteristics. The proposed antenna design shows triple-band characteristics, i.e., 1.88-2.06 GHz, 2.29-2.58 GHz and 2.9-3.93 GHz with the fractional bandwidth of 9.13%, 11.9% and 30.16%, respectively. Due to inverted L-strip, it shows circular polarization characteristics within the frequency range 3.3-3.55 GHz (AR < 3 dB). The simulated results are practically verified by using archetype of proposed antenna structure. The proposed antenna design is applicable to WLAN (2.4 GHz) and WiMAX (2.5/3.5 GHz) applications.
International Journal of RF and Microwave Computer-Aided Engineering, 2017
This communication investigates composite cylindrical dielectric resonator antenna (CDRA) for var... more This communication investigates composite cylindrical dielectric resonator antenna (CDRA) for various wireless applications. Three important features of proposed antenna design are (i) realization of two different hybrid modes, that is, HEM 11d and HEM 12d mode in CDRA with the help of modified annular ring printed line (work as both magnetic dipole and electric dipole), both the hybrid modes support broadside radiation characteristics (ii) suppression of HEM 21d mode, in order to reduce the cross-polarization level in H-plane of other hybrid modes (HEM 11d and HEM 12d mode) by an amount of 8-10 dB (iii) creation of triple-band attribute using the concept of composite antenna. The proposed antenna design has been fabricated and practically tested. Simulated outcomes show good agreement with measured outcomes. It works in three frequency bands, that is, 2.25-2.79 GHz, 3.1-4.0 GHz, and 5.05-5.6 GHz. The designed antenna structure is appropriate for WLAN and WiMAX applications.
2016 Twenty Second National Conference on Communication (NCC), 2016
In this paper, a dual segment two element wideband cylindrical dielectric resonator antenna array... more In this paper, a dual segment two element wideband cylindrical dielectric resonator antenna array with annular shaped corporate feed network is presented. To enhance impedance bandwidth, multisegmentation concept with shifted center has been pragmatic. Annular shaped microstrip parallel feed with quarter wave transformer etched on a single side of the copper grounded substrate (εr=4.4) is used to excite the dielectric resonator antenna. With this arrangement, approximately 46.8 % impedance bandwidth is achieved for the proposed cylindrical DRA array. The proposed antenna array gives the appreciable gain and better radiation characteristics at resonant frequencies. To validate the proposed design, a prototype of the proposed antenna array is fabricated, according to the optimized dimensions. Simulation is performed using Ansys HFSS simulation software and a close agreement between simulation and measured results has been observed.
International Journal of Microwave and Wireless Technologies, 2016
A probe feed wideband multi-element dual segments quarter cylindrical dielectric resonator antenn... more A probe feed wideband multi-element dual segments quarter cylindrical dielectric resonator antenna (q-CDRA) in composite forms have been proposed. The q-CDRA has been introduced by splitting CDRA into four uniform quarters and multi-segmentation approach has been castoff for further improvement in bandwidth of q-CDRA. The dual segments q-CDRA has been designed and analyzed using theoretical analysis and Ansoft HFSS simulation software. Further the dual segment multi-element q-CDRAs in composite form have been designed. A coaxial probe has been placed at the center of the ground plane for the excitation of proposed multi-element and multi-segmented composite form of q-CDRA, which excite TM01δ mode in the proposed antenna. The input characteristics and radiation patterns of the proposed composite antennas have been studied and their results are compared with corresponding experimental results. Prototype of single, two, and four elements dual-segment composite q-CDRAs have been fabrica...
Present day heavy ion accelerators use bunched ion beams of sub-nanosecond time scale for beam ac... more Present day heavy ion accelerators use bunched ion beams of sub-nanosecond time scale for beam acceleration. In order to monitor its longitudinal profile, fast faraday Cups are employed. Owing to the advent of microstrip technology and its fabrication process, planar structures have become easier to fabricate. A novel design using the same is developed with a special provision for mounting edge launch connectors through a microstripline, followed by a microstrip to stripline transistion to again a microstrip structure in the beam interaction hole. The entire structure is a 50 Ω is bidirectional. An experimental study on via placement around central strip has also been conducted to not only ensure the field containment around the strip but also for bandwidth enhancement. To measure ion beam currents from 10-100 nA and a bunch width of 1ns, device has been beam interaction hole of around 10mm. 3 dB bandwidth is measured >6 GHz with a rise time of ~60 ps. The devices are also provid...
In this paper design and development of triangular dielectric resonator antenna (TDRA) has been i... more In this paper design and development of triangular dielectric resonator antenna (TDRA) has been investigated. The coaxial probe feed at the center of the ground plane has been used for excitation of the TDRA. For the fabrication 50 Ω coaxial probe has been fitted at the centre of ground plane. The input characteristics of the proposed antenna have been extracted through Ansoft HFSS simulation software, which are compared with experimental results. Also, the radiation characteristics of the proposed TDRA has been found through Ansoft HFSS simulation software and compared with experimental results. The simulated results have been in good agreement with experimental results. The near field distribution has been observed at resonant frequency 5.8 GHz. It is apparent from near field analysis that the coaxial probe excites TM10-1 dominant mode fields in the antenna elements. The proposed antenna provides nearly 10.34% bandwidth (S11| < −10 dB) at a resonant frequency of 5.8 GHz with 6....
2017 IEEE Conference on Antenna Measurements & Applications (CAMA), 2017
In this article, a wideband hybrid multiple input multiple output (MIMO) cylindrical dielectric r... more In this article, a wideband hybrid multiple input multiple output (MIMO) cylindrical dielectric resonator antenna (CDRA) is studied. The wideband isolation is achieved with the help of novel circular ring shaped defected ground structure. The proposed MIMO antenna operates in the frequency range 3.7GHz-7.25GHz. Isolation of proposed MIMO antenna (S12) is less than −17dB over the entire operating band. The proposed antenna is found suitable for WLAN and WiMAX applications.
IET Microwaves, Antennas & Propagation, 2020
This study explains a novel wideband curvilinear Sierpinski fractal geometry (CSFG) based cylindr... more This study explains a novel wideband curvilinear Sierpinski fractal geometry (CSFG) based cylindrical dielectric resonator antenna. CSFG provides wider bandwidth by the combination of two important concepts: (i) reduction in volume to the surface area of the complete radiating structure, which in turn reduces the Q-factor; (ii) generation of two radiating modes inside the radiating structure HEM 11δ and TM 01δ . The prototype of the proposed antenna is fabricated for verifying the simulated results. Measured reflection coefficient (| S 11 |) shows that the proposed antenna structure operates over the frequency range 2.2–3.5 GHz with the fractional bandwidth of 45.61%. Diversified radiation pattern, i.e. monopole (due to TM 01δ mode) and broadside (due to HEM 11δ mode) is also an important feature of the proposed antenna structure. The antenna design is relevant for WLAN (2.5 GHz) and WiMAX (3.3 GHz) applications.
AEU - International Journal of Electronics and Communications, 2021
Abstract A triple-band polarization-independent conformal absorber for C- and X-frequency bands h... more Abstract A triple-band polarization-independent conformal absorber for C- and X-frequency bands have been presented. The designed absorber comprises a Jerusalem cross resonator at the center, surrounded by a quarter part of a square rings resonator with different sizes at each corner on a metal grounded dielectric substrate. The unit cell size is 0.23λo× 0.23λo and thickness of λo/153 at frequency 6.16 GHz. The absorption peaks were obtained at frequencies 6.16 GHz, 9.22 GHz, and 11.6 GHz with absorptivity 95%, 96 %, and 97%, respectively. It exhibited full wave at half maximum (FWHM) bandwidths of 160 MHz bands (6.04 GHz – 6.20 GHz, 240 MHz (9.09 GHz – 9.33 GHz), and 260 MHz (11.57 GHz -11.83 GHz), respectively. The designed absorber is shown four-fold symmetry, which makes it polarization independent. Normalized impedance and surface current distributions for all three absorption frequencies are analyzed for understanding the absorption phenomenon. The designed absorber has been tested for the curved surfaces with different central angles to show its conformal behavior, and it is perceived that measured results and simulated results have good agreement between them.
Microwave and Optical Technology Letters, 2018
In this article, a dual-sense circularly polarized (CP) hybrid antenna is reported. The proposed ... more In this article, a dual-sense circularly polarized (CP) hybrid antenna is reported. The proposed hybrid antenna comprises of an asymmetrical square ring-shaped printed line and a rectangular dielectric resonator (RDR). The asymmetricity present in the square ring is responsible for creating CP radiation with the opposite sense characteristics in the proposed antenna. Also, modified printed ring is used to excite TE 111 mode in the loaded RDR. This loading enhances the overall impedance bandwidth of the proposed antenna. For practical verification, a prototype of the proposed antenna is fabricated and tested. The measured outcomes indicate a close concurrence with the simulated outcomes. The proposed antenna works over the frequency range 3.28 GHz-5.78 GHz with a fractional bandwidth of 55.18%. Dual CP wave with dual-sense characteristics (Axial Ratio < 3 dB) are created in the frequency range 3.81-4.28 GHz and 4.98-5.28 GHz respectively. These responses make the proposed antenna suitable for WLAN and WiMAX applications.
Microwave and Optical Technology Letters, 2018
AEU - International Journal of Electronics and Communications, 2018
IEEE Antennas and Wireless Propagation Letters, 2019
This work presents a novel partial reflector surface (PRS) structure to improve the isolation and... more This work presents a novel partial reflector surface (PRS) structure to improve the isolation and correlation coefficient values between cylindrical dielectric resonator antennas (cDRAs) for multiband multiple-input-multiple-output (MIMO) applications. To achieve multiband characteristics, three different groups of cDRA are proposed to cover 5.2 GHz, 5.5 GHz and 5.8 GHz bands, respectively. Each group has two cDRAs. So, three groups (i.e six cDRA) are placed at the top of the substrate and each cDRA is excited using a co-planer waveguide (CPW) fed conformal strip-line. To achieve improved isolation, three different phase gradient frequency selective surfaces (FSS) are designed which operate at 5.2 GHz, 5.5 GHz and 5.8 GHz bands, respectively. This phase gradient FSS is utilized as a superstrate above each group of DR elements. As a result, two different far-field patterns are achieved from each group of antenna elements which deliver improved isolation as well as low field correlation. This exclusive technique offers more than 12 dB of enhancement in isolation values and more than 70% improvement in envelope correlation coefficient (ECC) values, thus guaranteeing improved MIMO performance.
Microwave and Optical Technology Letters, 2018
IEEE Antennas and Propagation Magazine, 2018
IETE Technical Review, 2019
Journal of Circuits, Systems and Computers, 2018
The aim of the paper is to propose a design and analysis of multi-element multi-segment triangula... more The aim of the paper is to propose a design and analysis of multi-element multi-segment triangular dielectric resonator antenna (MEMS TDRA) with Radar Cross-Section (RCS). The proposed antenna has been excited through coaxial probe feed. The coaxial probe feed excites TM[Formula: see text] dominant mode fields within the TDR elements. A general guideline for wide bandwidth and high gain has been prepared for designing of MEMS TDRA. The model of the proposed MEMS TDRA has been studied through simulation (Ansoft HFSS software) and fabricated for measurement. The simulated antenna performance has good agreement with the measured one. The proposed MEMS TDRA performance has been compared with some similar type of previously published structure and found wider bandwidth and higher gain. The proposed MEMS TDRA provides monopole-like radiation pattern with nearly 39% bandwidth ([Formula: see text] dB). The average gain of 6.0 dBi has been found over the entire bandwidth. The RCS analysis ha...
IET Microwaves, Antennas & Propagation, 2018
This work presents a four-element, eight-port cylindrical dielectric resonator antenna (cDRA) wit... more This work presents a four-element, eight-port cylindrical dielectric resonator antenna (cDRA) with multi-directional pattern diversity for wireless access point applications. Initially, a dielectric resonator is fed by two different feeding techniques to create two simultaneous orthogonal patterns. This primary radiator is combined with similar radiators in a cross-configuration to obtain an eight-port multiple-input-multiple-output (MIMO) antenna system. The antenna elements are placed in such a way that each radiator of the proposed antenna can radiate in a different direction so that the field correlation between the antenna elements is minimum. The proposed diversity antenna consists of four antenna elements and eight polarised ports. Isolation between the ports is improved by generating orthogonal modes in each cDRA and exciting each cDRA to radiate in a different direction. The similarity in simulated and measured results confirm that the proposed eight-port diversity antenna is useful for the frequency ranges between 5.6 and 5.9 GHz for wireless local area network (WLAN) applications.
International Journal of RF and Microwave Computer-Aided Engineering, 2018
Progress In Electromagnetics Research C, 2016
In this article, a dual-polarized hybrid cylindrical dielectric resonator antenna (CDRA) is studi... more In this article, a dual-polarized hybrid cylindrical dielectric resonator antenna (CDRA) is studied. A ring-shaped patch along with an inverted L-strip is used to excite two different hybrid modes (HE 11δ and HE 12δ-like mode) in CDRA. HE 12δ mode in CDRA is very advantageous in terms of gain and radiation characteristics. The proposed antenna design shows triple-band characteristics, i.e., 1.88-2.06 GHz, 2.29-2.58 GHz and 2.9-3.93 GHz with the fractional bandwidth of 9.13%, 11.9% and 30.16%, respectively. Due to inverted L-strip, it shows circular polarization characteristics within the frequency range 3.3-3.55 GHz (AR < 3 dB). The simulated results are practically verified by using archetype of proposed antenna structure. The proposed antenna design is applicable to WLAN (2.4 GHz) and WiMAX (2.5/3.5 GHz) applications.
International Journal of RF and Microwave Computer-Aided Engineering, 2017
This communication investigates composite cylindrical dielectric resonator antenna (CDRA) for var... more This communication investigates composite cylindrical dielectric resonator antenna (CDRA) for various wireless applications. Three important features of proposed antenna design are (i) realization of two different hybrid modes, that is, HEM 11d and HEM 12d mode in CDRA with the help of modified annular ring printed line (work as both magnetic dipole and electric dipole), both the hybrid modes support broadside radiation characteristics (ii) suppression of HEM 21d mode, in order to reduce the cross-polarization level in H-plane of other hybrid modes (HEM 11d and HEM 12d mode) by an amount of 8-10 dB (iii) creation of triple-band attribute using the concept of composite antenna. The proposed antenna design has been fabricated and practically tested. Simulated outcomes show good agreement with measured outcomes. It works in three frequency bands, that is, 2.25-2.79 GHz, 3.1-4.0 GHz, and 5.05-5.6 GHz. The designed antenna structure is appropriate for WLAN and WiMAX applications.
2016 Twenty Second National Conference on Communication (NCC), 2016
In this paper, a dual segment two element wideband cylindrical dielectric resonator antenna array... more In this paper, a dual segment two element wideband cylindrical dielectric resonator antenna array with annular shaped corporate feed network is presented. To enhance impedance bandwidth, multisegmentation concept with shifted center has been pragmatic. Annular shaped microstrip parallel feed with quarter wave transformer etched on a single side of the copper grounded substrate (εr=4.4) is used to excite the dielectric resonator antenna. With this arrangement, approximately 46.8 % impedance bandwidth is achieved for the proposed cylindrical DRA array. The proposed antenna array gives the appreciable gain and better radiation characteristics at resonant frequencies. To validate the proposed design, a prototype of the proposed antenna array is fabricated, according to the optimized dimensions. Simulation is performed using Ansys HFSS simulation software and a close agreement between simulation and measured results has been observed.
International Journal of Microwave and Wireless Technologies, 2016
A probe feed wideband multi-element dual segments quarter cylindrical dielectric resonator antenn... more A probe feed wideband multi-element dual segments quarter cylindrical dielectric resonator antenna (q-CDRA) in composite forms have been proposed. The q-CDRA has been introduced by splitting CDRA into four uniform quarters and multi-segmentation approach has been castoff for further improvement in bandwidth of q-CDRA. The dual segments q-CDRA has been designed and analyzed using theoretical analysis and Ansoft HFSS simulation software. Further the dual segment multi-element q-CDRAs in composite form have been designed. A coaxial probe has been placed at the center of the ground plane for the excitation of proposed multi-element and multi-segmented composite form of q-CDRA, which excite TM01δ mode in the proposed antenna. The input characteristics and radiation patterns of the proposed composite antennas have been studied and their results are compared with corresponding experimental results. Prototype of single, two, and four elements dual-segment composite q-CDRAs have been fabrica...