R. Gayathri Rajaraman - Academia.edu (original) (raw)

Papers by R. Gayathri Rajaraman

In this paper the design of a multi resonant patch antenna is presented. The conventional antenna... more In this paper the design of a multi resonant patch antenna is presented. The conventional antenna is modified by removing small triangular slots from its patch. This attempt is continued in order to make the antenna radiate at WIMAX, Public and Private Bands with adequate gain and Bandwidth. The proposed antenna has an omnidirectional pattern with radiating efficiency greater than 85% in all the three bands of resonances.

A compact floral patterned antenna using a novel metamaterial structure (CSRR) in its ground plan... more A compact floral patterned antenna using a novel metamaterial structure (CSRR) in its ground plane is presented. These metamaterial structures miniaturize the antenna, inducing tetra resonances. The antenna resonates at 4.735, 5.185, 6.08, 6.71 GHz with adequate gains of 2.87, 3.05, 3.76, 4.30 dB’s and a bandwidth of 56, 75, 50, 110 MHz in its resonances. The proposed antenna is targeted to create resonances in Radar and public Bands of frequency spectras. Key Antenna parameters obtained from the simulator are presented along with detailed discussions in this paper

International Journal of Advanced Research in Computer Science, 2017

Two different antenna models are presented in this paper They are designed with Spiral resonators... more Two different antenna models are presented in this paper They are designed with Spiral resonators (SR); One with SR on Ground and another with SR’s on Patch. In Model I, A compact dual band triangular patch antenna using a novel metamaterial structure in its ground plane is designed. The role of the metamaterial structure is to miniaturize the antenna, inducing multi resonances. The antenna resonates at 5.46, 6.02 GHz with adequate gains of 3.2, and 5.6 dBs respectively. Key Antenna parameters obtained from the simulator are presented along with detailed discussions. In Model II, A novel dual band triangular patch antenna designed using Spiral resonators (SR) in its patch is presented. The metamaterial structure (SR) used in this design effectively reduces the size of conventional patch resulting in dual resonances with wide apart spectras. The antenna is found to resonate at 10.38, 13.99 GHz with gains of 3.6 and 5.4 dBs respectively. The antenna has an Omnidirectional pattern and ...

International Journal of Advanced Research in Computer Science, 2017

The design of a tetra band resonant antenna using Koch iteration is presented in this paper. The ... more The design of a tetra band resonant antenna using Koch iteration is presented in this paper. The concept is a fusion technology involving fractal antenna with slots on the radiating patch. Four bands of resonances are optimized by using an FEM based simulator. Koch Fractals are simulated up to iteration two. Circular slots and triangular slots are also etched on the patch to freeze the required spectras. The designed antenna resonates at 2.61, 6.25, 8.21, 14.58 GHz. The gains are found to be adequate in all the bands with Omnidirectional Patterns. Keywords: Microstrip Patch Antenna, Fractal Antennas, Linear Polarization, Wireless Applications

International journal of scientific research in science, engineering and technology, 2018

Conventional Patch antennas when etched with regular geometry resonates at a lower frequency. Ini... more Conventional Patch antennas when etched with regular geometry resonates at a lower frequency. Initially patch was found to resonate at 2.4 GHz. In this paper, by creating a simple L shaped structure on the patch the antenna is found to resonate at 1.92 i.e. in PCS spectra. The simulated model and its analysis are presented.

International journal of scientific research in science, engineering and technology, 2017

Many techniques for multiresonances were formulated by researchers of which kotch fractals are on... more Many techniques for multiresonances were formulated by researchers of which kotch fractals are one. Kotch fractal first iteration is attempted in this paper. Further modifications are done by creating certain slots on patch while swastik shaped slots are created on its ground plane. The modified antenna is found to resonate At 6.28, 6.88, 7.6, 11.68, 14.8, 16.96 GHz Frequencies which finds application in satellite communication, radiolocation.

Printed antennas particularly Microstrip antennas has very attractive features in it and hence ha... more Printed antennas particularly Microstrip antennas has very attractive features in it and hence has a variety of applications. The main idea in drafting this paper is to give an over view of works carried in this type of antenna research.

A novel dual band triangular patch antenna designed using Spiral resonators (SR) in its patch is ... more A novel dual band triangular patch antenna designed using Spiral resonators (SR) in its patch is presented. The metamaterial structure (SR) used in this design effectively reduces the size of conventional patch resulting in dual resonances with wide apart spectra. The antenna is found to resonate at 10.38, 13.99 GHz with gains of 3.6 and 5.4 dBs respectively. The antenna has an Omnidirectional pattern and good directivity at the resonant bands. Keywords: Triangular Microstrip patch antenna, linear polarization, wireless applications

In this paper, the design of a Wide band, compact, miniaturized patch antenna for WLAN, WIMAX app... more In this paper, the design of a Wide band, compact, miniaturized patch antenna for WLAN, WIMAX applications is presented. The conventional patch antenna is designed to resonate at 2.785 GHz. The proposed rectangular patch is initially modified by chamfering the lower radiating edge (to make it much more compact). Further, the proposed antenna has two U shaped slots etched over the patch and a U shaped slot on the microstrip feed line. Besides this, a spiral resonator is also etched over its ground plane. This antenna has dual resonances one at 2.476 GHz and another at 2.54 GHz with a gain of 4.5 dB, 5.09 dB respectively. The percentage of miniaturization is found to be 27.38%, 20.89% for the two band of resonances.

Complementary split ring resonators (CSRR) (planar structures hence easily realizable nature) exh... more Complementary split ring resonators (CSRR) (planar structures hence easily realizable nature) exhibit negative permittivity. The Design of a Novel Dual band Patch Antenna using CSRR and fractal concept is presented in this paper. The Kotch fractals are effectively implemented; circular, triangular slots are also further etched on the patch. The antennas radiating feature is improved by loading its ground plane with an innovative material named Metamaterial (Complementary Split Ring Resonator) Confirming an Omnidirectional pattern with radiating efficiency greater than 99, 86% respectively in the bands of its resonances. The model yields adequate Gain, Directivity at its resonances. The Key antenna parameter analysis (with the aid of commercial E.M simulator) carried out is also presented. Keywords: Microstrip Patch Antenna, Linear Polarization, Wireless Applications, Fractal, Koch, CSRR.

Journal of Signal Processing, 2019

Conventional Microstrip Patch Antennas have a PEC ground plane and because of this reason its ban... more Conventional Microstrip Patch Antennas have a PEC ground plane and because of this reason its bandwidth is always narrow. In this paper, a novel triple band antenna model is presented in which L shaped patterns are etched on its ground plane making it a magnetic plane, resulting in superior radiating features due to effective elimination of surface waves (because of slots in its ground plane). The proposed antenna resonates at three frequencies, i.e., 2.36, 3.42, 4.46 GHz. This antenna has an adequate gain of 4.6, 4.5, 3.3 dBs respectively at its resonances, exhibiting linear Polarization.

components; are loaded onto a microstrip patch and effectively utilized for obtaining wideband be... more components; are loaded onto a microstrip patch and effectively utilized for obtaining wideband behavior through staggered resonances and for radiator size reduction. A basic inset-fed patch antenna is loaded with a pair of CSRR on both the sides with a small change in dimension leading to closely overlapping resonances resulting in a wide bandwidth. Additionally, a spiral resonator is inscribed in the ground-plane under the patch metallization to suppress surface waves and to improve the radiation characteristics. The antenna is simulated and optimized using Ansys HFSS®, a benchmarked commercial software. Analyzed results of the proposed antenna are presented. Satisfactory impedance and radiation characteristics are obtained with ~ 87 % radiation efficiency and 6% miniaturization.

In this paper we present a novel miniaturized dual-band patch antenna based on the metamaterial c... more In this paper we present a novel miniaturized dual-band patch antenna based on the metamaterial concept. Complementary split ring resonators, which are excellent structures for miniaturization; along with spiral resonators are used in the proposed design for obtaining a compact dual-band patch antenna. The original patch which is designed to resonate at 2.86 GHz is found to resonate at 1.92 GHz & 2.44 GHz when loaded with three pairs of square complementary ring resonators. Further its ground is also loaded with a spiral resonator yielding a relatively compact antenna structure. The present design has been tuned to the above two bands which finds application in PCS and WLAN applications. The percentage of miniaturization obtained is 51.4 % & 17.6 % respectively. The proposed antenna achieves an efficiency of 80% & 37% in the two bands of resonance.

Printed antennas particularly Microstrip antennas has very attractive features in it and hence ha... more Printed antennas particularly Microstrip antennas has very attractive features in it and hence has a variety of applications. The main idea in drafting this paper is to give an over view of works carried in this type of antenna research.

In this paper the design of a multi resonant patch antenna is presented. The conventional antenna... more In this paper the design of a multi resonant patch antenna is presented. The conventional antenna is modified by removing small triangular slots from its patch. This attempt is continued in order to make the antenna radiate at WIMAX, Public and Private Bands with adequate gain and Bandwidth. The proposed antenna has an omnidirectional pattern with radiating efficiency greater than 85% in all the three bands of resonances.

A compact floral patterned antenna using a novel metamaterial structure (CSRR) in its ground plan... more A compact floral patterned antenna using a novel metamaterial structure (CSRR) in its ground plane is presented. These metamaterial structures miniaturize the antenna, inducing tetra resonances. The antenna resonates at 4.735, 5.185, 6.08, 6.71 GHz with adequate gains of 2.87, 3.05, 3.76, 4.30 dB’s and a bandwidth of 56, 75, 50, 110 MHz in its resonances. The proposed antenna is targeted to create resonances in Radar and public Bands of frequency spectras. Key Antenna parameters obtained from the simulator are presented along with detailed discussions in this paper

International Journal of Advanced Research in Computer Science, 2017

Two different antenna models are presented in this paper They are designed with Spiral resonators... more Two different antenna models are presented in this paper They are designed with Spiral resonators (SR); One with SR on Ground and another with SR’s on Patch. In Model I, A compact dual band triangular patch antenna using a novel metamaterial structure in its ground plane is designed. The role of the metamaterial structure is to miniaturize the antenna, inducing multi resonances. The antenna resonates at 5.46, 6.02 GHz with adequate gains of 3.2, and 5.6 dBs respectively. Key Antenna parameters obtained from the simulator are presented along with detailed discussions. In Model II, A novel dual band triangular patch antenna designed using Spiral resonators (SR) in its patch is presented. The metamaterial structure (SR) used in this design effectively reduces the size of conventional patch resulting in dual resonances with wide apart spectras. The antenna is found to resonate at 10.38, 13.99 GHz with gains of 3.6 and 5.4 dBs respectively. The antenna has an Omnidirectional pattern and ...

International Journal of Advanced Research in Computer Science, 2017

The design of a tetra band resonant antenna using Koch iteration is presented in this paper. The ... more The design of a tetra band resonant antenna using Koch iteration is presented in this paper. The concept is a fusion technology involving fractal antenna with slots on the radiating patch. Four bands of resonances are optimized by using an FEM based simulator. Koch Fractals are simulated up to iteration two. Circular slots and triangular slots are also etched on the patch to freeze the required spectras. The designed antenna resonates at 2.61, 6.25, 8.21, 14.58 GHz. The gains are found to be adequate in all the bands with Omnidirectional Patterns. Keywords: Microstrip Patch Antenna, Fractal Antennas, Linear Polarization, Wireless Applications

International journal of scientific research in science, engineering and technology, 2018

Conventional Patch antennas when etched with regular geometry resonates at a lower frequency. Ini... more Conventional Patch antennas when etched with regular geometry resonates at a lower frequency. Initially patch was found to resonate at 2.4 GHz. In this paper, by creating a simple L shaped structure on the patch the antenna is found to resonate at 1.92 i.e. in PCS spectra. The simulated model and its analysis are presented.

International journal of scientific research in science, engineering and technology, 2017

Many techniques for multiresonances were formulated by researchers of which kotch fractals are on... more Many techniques for multiresonances were formulated by researchers of which kotch fractals are one. Kotch fractal first iteration is attempted in this paper. Further modifications are done by creating certain slots on patch while swastik shaped slots are created on its ground plane. The modified antenna is found to resonate At 6.28, 6.88, 7.6, 11.68, 14.8, 16.96 GHz Frequencies which finds application in satellite communication, radiolocation.

Printed antennas particularly Microstrip antennas has very attractive features in it and hence ha... more Printed antennas particularly Microstrip antennas has very attractive features in it and hence has a variety of applications. The main idea in drafting this paper is to give an over view of works carried in this type of antenna research.

A novel dual band triangular patch antenna designed using Spiral resonators (SR) in its patch is ... more A novel dual band triangular patch antenna designed using Spiral resonators (SR) in its patch is presented. The metamaterial structure (SR) used in this design effectively reduces the size of conventional patch resulting in dual resonances with wide apart spectra. The antenna is found to resonate at 10.38, 13.99 GHz with gains of 3.6 and 5.4 dBs respectively. The antenna has an Omnidirectional pattern and good directivity at the resonant bands. Keywords: Triangular Microstrip patch antenna, linear polarization, wireless applications

In this paper, the design of a Wide band, compact, miniaturized patch antenna for WLAN, WIMAX app... more In this paper, the design of a Wide band, compact, miniaturized patch antenna for WLAN, WIMAX applications is presented. The conventional patch antenna is designed to resonate at 2.785 GHz. The proposed rectangular patch is initially modified by chamfering the lower radiating edge (to make it much more compact). Further, the proposed antenna has two U shaped slots etched over the patch and a U shaped slot on the microstrip feed line. Besides this, a spiral resonator is also etched over its ground plane. This antenna has dual resonances one at 2.476 GHz and another at 2.54 GHz with a gain of 4.5 dB, 5.09 dB respectively. The percentage of miniaturization is found to be 27.38%, 20.89% for the two band of resonances.

Complementary split ring resonators (CSRR) (planar structures hence easily realizable nature) exh... more Complementary split ring resonators (CSRR) (planar structures hence easily realizable nature) exhibit negative permittivity. The Design of a Novel Dual band Patch Antenna using CSRR and fractal concept is presented in this paper. The Kotch fractals are effectively implemented; circular, triangular slots are also further etched on the patch. The antennas radiating feature is improved by loading its ground plane with an innovative material named Metamaterial (Complementary Split Ring Resonator) Confirming an Omnidirectional pattern with radiating efficiency greater than 99, 86% respectively in the bands of its resonances. The model yields adequate Gain, Directivity at its resonances. The Key antenna parameter analysis (with the aid of commercial E.M simulator) carried out is also presented. Keywords: Microstrip Patch Antenna, Linear Polarization, Wireless Applications, Fractal, Koch, CSRR.

Journal of Signal Processing, 2019

Conventional Microstrip Patch Antennas have a PEC ground plane and because of this reason its ban... more Conventional Microstrip Patch Antennas have a PEC ground plane and because of this reason its bandwidth is always narrow. In this paper, a novel triple band antenna model is presented in which L shaped patterns are etched on its ground plane making it a magnetic plane, resulting in superior radiating features due to effective elimination of surface waves (because of slots in its ground plane). The proposed antenna resonates at three frequencies, i.e., 2.36, 3.42, 4.46 GHz. This antenna has an adequate gain of 4.6, 4.5, 3.3 dBs respectively at its resonances, exhibiting linear Polarization.

components; are loaded onto a microstrip patch and effectively utilized for obtaining wideband be... more components; are loaded onto a microstrip patch and effectively utilized for obtaining wideband behavior through staggered resonances and for radiator size reduction. A basic inset-fed patch antenna is loaded with a pair of CSRR on both the sides with a small change in dimension leading to closely overlapping resonances resulting in a wide bandwidth. Additionally, a spiral resonator is inscribed in the ground-plane under the patch metallization to suppress surface waves and to improve the radiation characteristics. The antenna is simulated and optimized using Ansys HFSS®, a benchmarked commercial software. Analyzed results of the proposed antenna are presented. Satisfactory impedance and radiation characteristics are obtained with ~ 87 % radiation efficiency and 6% miniaturization.

In this paper we present a novel miniaturized dual-band patch antenna based on the metamaterial c... more In this paper we present a novel miniaturized dual-band patch antenna based on the metamaterial concept. Complementary split ring resonators, which are excellent structures for miniaturization; along with spiral resonators are used in the proposed design for obtaining a compact dual-band patch antenna. The original patch which is designed to resonate at 2.86 GHz is found to resonate at 1.92 GHz & 2.44 GHz when loaded with three pairs of square complementary ring resonators. Further its ground is also loaded with a spiral resonator yielding a relatively compact antenna structure. The present design has been tuned to the above two bands which finds application in PCS and WLAN applications. The percentage of miniaturization obtained is 51.4 % & 17.6 % respectively. The proposed antenna achieves an efficiency of 80% & 37% in the two bands of resonance.

Printed antennas particularly Microstrip antennas has very attractive features in it and hence ha... more Printed antennas particularly Microstrip antennas has very attractive features in it and hence has a variety of applications. The main idea in drafting this paper is to give an over view of works carried in this type of antenna research.