Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Compact Sized High Gain and Ultra-Wideband HMSIW cavity backed Slot Antenna for Ku-band Applications(Institute of Electrical and Electronics Engineers Inc., 2022) Puli, N.; Goud, M.; Kandasamy, K.This paper proposes half-mode substrate integrated waveguide cavity-based slot antenna with high gain and ultra-wideband characteristics. The compact size of 38.4mm X 8mm X 0.787mm and high gain is achieved using the narrow rectangular half-mode SIW cavity. A periodic arrangement of the bubbled slots is introduced to obtain wideband operation with an impedance bandwidth of 2.16GHz i.e., from 13.5 GHz to 15.66 GHz. In addition, the proposed design provides gain varying from 9.5 dBi to 10.6 dBi in the required frequency of operation. Radiation pattern reveals that the front-to-back ratio (FTBR) of 19.56 dB and radiation efficiency greater than 93%, is accomplished over the complete band of operation. The proposed antenna is best suitable for small satellite designs in Ku-band and is designed on an Rogers RT/Duroid 5880 substrate (with a thickness of 0.787 mm) and simulations were carried out in the Computer simulation technology studio suite. The simulation results demonstrates novel antenna design with adequate gain and bandwidth requirements for high gain practical applications. © 2022 IEEE.Item A Novel Compact Wideband Planar Antenna Design for FOPEN Radar Applications(Institute of Electrical and Electronics Engineers Inc., 2023) Shetty, A.K.; Goud, M.; Kandasamy, K.; Srihari, P.This paper presents a compact antenna operating in the L-band for foliage penetration (FOPEN) radar applications. The antenna structure is built using a planar technology having two dielectric layers and three metallic layers. Further, it consists of a modified near-field resonant parasitic (MNFRP) mesh structure on the top layer, an MNFRP composite Egyptian axe dipole (CEAD) placed in the middle layer, and an L-shaped dipole as a feeding element in the bottom layer. In addition, the two substrates: Roger 4003C and Roger 4350B, are sandwiched between the three metallic layers. Thereafter, the L-shaped dipole is excited separately with the MNFRP CEAD and MNFRP Mesh structure to provide resonance at two different frequencies (1.3 GHz and 1.8 GHz) in the upper portion of the L-band. Besides that, the overlapping nature of the proposed antenna structure yields enhanced bandwidth. The overall dimension of the antenna is approximately 0.41 λ X 0.41 λ × 0.0038 λ. The simulation results reveal that the proposed antenna structure produces a 550 MHz impedance bandwidth(-10dB) with 2.13 dBi gain and achieved the voltage standing wave ratio (VSWR) of 1.12. The simulations are carried out using the computer simulation tool (CST) microwave studio suite. © 2023 IEEE.Item Dual-Functional Metasurface Reflector for Wideband Polarization Conversion and RCS Reduction Applications(Institute of Electrical and Electronics Engineers Inc., 2023) Goud, M.; Kandasamy, K.; Majumder, B.A wideband polarization transforming reflective metasurface with dual functionality is proposed in this work. It converts the incident TE(Transverse Electric)/TM(Transverse Magnetic) waves into circularly polarized waves in a portion of the operating band and also into TM/TE waves respectively waves at the remaining frequency spectrum. The proposed unit cell's front side comprises of tapered rectangular metal connected with a circular patch and backside by a metal ground. Proposed structure exhibits circular polarization (CP) conversion from 13.5-20.9 GHz and cross polarization (XP) conversion from 11.12-12.64 and 23.32-34.65 GHz. The proposed meta-atom and 90 degree rotated image are used to construct checkerboard metasurface with 10 × 10 elements for RCS reduction. It is inferred from the simulation results that a significant reduction in RCS is observed in the LP-XP band. The dimensions of the realized meta-atom are 0.297 × 0.297 × 0.062 λ03 (where λ0 is dependent on lowest operating frequency), and is best suitable for future wireless communication and RCS reduction application simultaneously. © 2023 IEEE.Item Broadband Linear to Circular and Multi-Band Cross Polarization Conversion Reflective Metasurface for Ku, K and Ka Band Applications(Institute of Electrical and Electronics Engineers Inc., 2023) Goud, M.; Kandasamy, K.; Majumder, B.This work proposes a low-profile reflective meta-structure to convert incident linearly polarized (LP) waves to circularly polarized (CP) waves with broadband characteristics and also into cross polarized waves with narrowband characteristics. The unit cell in the proposed design consists of a tapered rectangular metal strip along the diagonal and a square patch at the center. When an X-polarized or Y-polarized wave impinges on the meta-structure, it converts into circular polarization in Ku, K and lower portion of spectrum in the Ka-band. This meta-atom exhibits cross polarization conversion from 10.98-12.15 GHz, 31.62-34.26 GHz and 34.95-37.2 GHz. The dimensions of the optimized unit cell are 0.292 × 0.292 × 0.062 λ0·3 mm (where λ0 is calculated based on lowest operating frequency) with axial ratio bandwidth 77.76% can be used for the future wireless communication, also when the actual and mirror meta-atom arranged in checkerboard format can be used for RCS reduction application. © 2023 IEEE.Item Novel Reflective Phased Meta-Atom Array for Beam Forming along Multiple Planes(Institute of Electrical and Electronics Engineers Inc., 2024) Paul, P.; Goud, M.; Kandasamy, K.; Majumder, B.In this paper a novel beam-forming technique for focused microwave power transmission (MPT) at specific frequencies that enables far-field transmission at three directions in the elevation plane is proposed. A simple and planar phased metasurface comprising of an array of subwavelength meta-unit cells is designed to focus the microwave energy at 4.2 GHz at desired angles in the azimuthal and elevation planes. The beam formed is made to focus energy at 0° by a suitably designed meta surface. The phase profile of the meta-atom array is then suitably tuned, to split the RF energy at elevation angles of 70° and -70° directions in azimuthal planes of 45°, 135°,225° and 315°. This ensures the compatibility of the designed reflective array surface with antenna radiators and hence, allows for the availability of power at different directions of focus. This functionality can be used to focus or deflect power in case of sensors placed at different locations in the far-field proximity of the main radiator. A patch antenna radiating at 4.2 GHz is used to conduct the simulation study using CST Microwave Studio. © 2024 IEEE.