Browsing by Author "Pandeeswari, Ramasamy"

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    A compact non-bianisotropic complementary split ring resonator inspired microstrip triple band antenna
    (Electromagnetics Academy, 2018-02-13) Pandeeswari, Ramasamy
    A Compact Non-Bianisotropic Complementary Split Ring Resonator (NB-CSRR) based microstrip triple band antenna is presented in this paper. The antenna has a simple structure compared to other antennas for triple band operation. The antenna consists of a microstrip-fed NBCSRR loaded radiating element and partial ground plane. The designed antenna has a compact size of 29.4 mm × 26 mm × 1.6 mm. Two NBCSRR slots are etched on the radiating patch. Bottom NB-CSRR is used to generate new resonance, and top NB-CSRR is used to improve the return loss. The measured data show that the antenna covers the frequency ranges of 2.5 GHz–3.61 GHz, 4.06 GHz– 4.69 GHz, 4.80 GHz–6.07 GHz with impedance bandwidth of (< −10 dB) of 1.11 GHz, 0.63 GHz and 1.27 GHz. The results show that the antenna can cover WLAN and C band applications.
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    A Novel CSRR Loaded Compact ACS Fed Monopole Antenna for Sub-6 GHz 5G Applications
    (Electromagnetics Academy, 2022-09-09) Reddy, Mekala Ananda; Jency, Albert Ruth; Shabdita, Sharma; Pandeeswari, Ramasamy
    The design of a Complementary Split Ring Resonator (CSRR) embedded compact Asymmetric Coplanar Strip (ACS) fed monopole antenna is presented in this paper. By incorporating the ACS feed, a substantial reduction of 27% in antenna dimensions is achieved. Further miniaturization of 68.6% is obtained by embedding CSRR on the designed patch and a trapezoidal ground. The overall size of the antenna is 13.2 × 27 × 1.6 mm3, and it is printed on an FR4-epoxy substrate. The antenna operates with a resonant frequency of 3.6 GHz and a bandwidth of 3.3 GHz (3.2-6.5 GHz). Thus it is appropriate for sub-6 GHz 5G applications. It exhibits a return loss of -28 dB and a gain of 2.8 dBi at the resonant frequency. The antenna is fabricated, and the measured results match well with the simulated ones. Being a simple, cheap, and uniplanar structure, the proposed antenna can meet the requirements of a modern wireless communication system.
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    Asymmetric Coplanar Strip-Fed Electrically Small Metamaterial Inspired Antenna for Quadband Operation
    (Electromagnetics Academy, 2022-10-25) Pillai, Prathibha N; Pandeeswari, Ramasamy
    This article presents a novel electrically small asymmetric coplanar strip (ACS) fed metamaterial inspired antenna for quad band operation. A metamaterial inspired open split ring resonator (OSRR) is the radiator which is fed using ACS to obtain four operating bands. The proposed antenna with a compact size of 18 mm × 15.5 mm × 1.6 mm is fabricated and tested. The experimental results are in good compliance with simulated ones. The proposed electrically small antenna has a radian sphere (ka) of 0.65 and achieves an average gain of 2.24 dBi with requisite radiation properties suitable for WiMAX and WLAN applications.
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    Complementary Folded Line Metamaterial Loaded MIMO Antenna for S-Band Applications
    (Electromagnetics Academy, 2024-11-29) Mood, Yugender; Pandeeswari, Ramasamy
    This paper introduces a MIMO antenna featuring a complementary folded-line metamaterial (CFL-MTM) design, It wants to reduce mutual interaction among very close microstrip patch antenna components. The antenna elements have an edge-to-edge spacing of roughly 0.0933λ0 (7 mm). By integrating CFL-MTM elements into the antenna structure, the antenna achieves negative permittivity and permeability characteristics, resulting in a compact size of 37 × 44 × 1.6 mm3. The antenna is suitable for S band applications, covering a bandwidth of approximately 3.121–4.277 GHz (1156 MHz). The incorporation of CFL-MTM results in a negative refractive index area, which effectively controls and reduces mutual coupling between the antenna parts. The antenna’s dimension is optimized by keeping the CFL-MTM smaller than the resonant wavelength. Furthermore, the characteristics of the suggested MIMO antenna, such as ECC, CCL, and TARC, are assessed to show that it is suitable for S-band applications.
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    Complimentary split ring resonator inspired meandered CPW-fed monopole antenna for multiband operation
    (Electromagnetics Academy, 2017-12-01) Pandeeswari, Ramasamy
    A novel design of Meandered Coplanar waveguide (CPW) fed CSRR loaded multiband antenna is presented in this paper. A compact triple-band antenna is designed by etching CSRR slots on the radiating element. The proposed antenna shows good performance at all resonant frequencies. The simulation results are discussed and compared with the measured ones. The effects of CSRR loading on the radiating element are explained. Parametric studies are carried out and explained in detail. The proposed antenna is fabricated and measured, and the results are compared with the simulated ones. CSRR permittivity characteristics are explained to validate the results. The proposed antenna can be used for C-band, Wireless Local Area Network (WLAN) and International Telecommunications Union (ITU) applications.
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    Design and analysis of open complementary split ring resonators loaded monopole antenna for multiband operation
    (Electromagnetics Academy, 2017-10-12) Daniel, Raphael Samson; Pandeeswari, Ramasamy; Raghavan, Singaravelu
    This paper describes a compact triple-band monopole antenna based on Open Complementary Split Ring Resonators (OCSRRs) for Wireless Local Area Network (WLAN) and Worldwide interoperability Microwave Access (WiMAX) applications. The monopole antenna with engraved ground plane is used to cover WLAN frequencies (2.67 GHz and 5.47 GHz). The resonant frequency of WiMAX (3.43GHz) is achieved by introducing OCSRR in the monopole antenna. In order to achieve multiband and good impedance matching, OCSRRs are introduced in the rectangular monopole antenna. The prototype antenna is fabricated on an FR-4 substrate having dimension of 29.4 × 26 × 1.6mm3. Simulated and measured results are shown in good equivalence. The dipole radiation pattern is obtained in the elevation plane (E-plane), and omnidirectional radiation pattern is obtained in the azimuthal plane (H-plane). Parametric analysis of OCSRRs is studied to attain the best results. The proposed antenna has adequate advantages, including compact size, multiband, and impedance matching.
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    Design and analysis of open complementary split ring resonators loaded monopole antenna for multiband operation
    (Electromagnetics Academy, 2017-10-12) Daniel, Raphael Samson; Pandeeswari, Ramasamy; Raghavan, Singaravelu
    This paper describes a compact triple-band monopole antenna based on Open Complementary Split Ring Resonators (OCSRRs) for Wireless Local Area Network (WLAN) and Worldwide interoperability Microwave Access (WiMAX) applications. The monopole antenna with engraved ground plane is used to cover WLAN frequencies (2.67 GHz and 5.47 GHz). The resonant frequency of WiMAX (3.43GHz) is achieved by introducing OCSRR in the monopole antenna. In order to achieve multiband and good impedance matching, OCSRRs are introduced in the rectangular monopole antenna. The prototype antenna is fabricated on an FR-4 substrate having dimension of 29.4 × 26 × 1.6mm3. Simulated and measured results are shown in good equivalence. The dipole radiation pattern is obtained in the elevation plane (E-plane), and omnidirectional radiation pattern is obtained in the azimuthal plane (H-plane). Parametric analysis of OCSRRs is studied to attain the best results. The proposed antenna has adequate advantages, including compact size, multiband, and impedance matching.
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    Design and Optimization of Substrate Integrated Waveguide Bandpass Filter with T-Shape Slots Using Artificial Neural Networks
    (Electromagnetics Academy, 2023-03-15) Rayala, Ranjit Kumar; Pandeeswari, Ramasamy; Raghavan, Singaravelu
    The present paper describes a substrate integrated waveguide (SIW) bandpass filter with a T-shape slot on the upper layer, which exhibits a wide-band frequency response. The parameters of the filter are optimized by using Multi-Layer Perceptron artificial neural network (MLP-ANN) that uses Levenberg-Marquardt (LM) algorithm. A comparison is made between ANN optimized results and simulated results, and they result in minimum mean square error (MSE). A physical prototype is fabricated using printed circuit board (PCB) process, and measurements are conducted using the network analyzer. The measured results obtained agree well with the estimated ones. The filter shows a wide-band response with a transmission bandwidth of 8.96 GHz, ranging from 6.10 to 15.06 GHz with a fractional bandwidth of 81.4%. Furthermore, the insertion loss of the filter in the entire passband is varied from −0.4 dB to −0.2 dB, and the return loss is more than −10 dB. © 2023, Electromagnetics Academy. All rights reserved.
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    Metamaterial Perfect Absorber Using Vanadium Oxide Hexagonal Ring Structure
    (Electromagnetics Academy, 2022-08-17) Reddy, Mekala Ananda; Praveena, Namanathan; Gunavathi, Nagarajan; Pandeeswari, Ramasamy
    A Metamaterial Terahertz perfect absorber is proposed in this letter. The structure comprises Vanadium oxide (VO2) resonator hexagonal rings placed on top of a silicon dioxide (SiO2) substrate in a concentric pattern on a metal ground layer, with 1 THz and 6 THz operating frequency. Numerical studies are done by an electromagnetic solver. The results show almost perfect absorption, with 112% average absorption at different incident polarization angles, in the range of 1.64 to 6.1 THz. The optimization is carried out on physical dimensions for maximum absorption results. The proposed design can be used as a highly efficient absorber in applications like solar energy harvesting, cloaking, sensing, imaging technology, and EMC projects.
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    SRR and NBCSRR Inspired CPW Fed Triple Band Antenna with Modified Ground Plane
    (Electromagnetics Academy, 2018-01-12) Pandeeswari, Ramasamy
    In this paper, a novel CPW-fed triple band metamaterial inspired antenna with modified ground plane is presented. The metamaterial inspired structures such as split ring resonator (SRR) and non bianisotropic complementary split ring resonator (NBCSRR) are embeded in this antenna for triple band operation. The proposed antenna with a compact size of 25 × 31.7 × 1.6mm3 is fabricated and tested. The antenna with good radiation characteristics is suitable for WIMAX, C band and WLAN applications. The simulated and measured results are discussed and are in good agreement with each other.