Flexible and miniaturized design of microstrip patch antenna with improved cross-polarized radiation

A simple and miniaturized design of rectangular microstrip patch antenna (RMPA) is presented with improved cross-polarization (XP) purity. This design approach is much more flexible to tune the resonance frequency of the antenna for its optimum performance. A complete design guideline based on theoretical analysis has been provided to estimate the antenna resonance frequency and corresponding resonant mode. The higher-order spurious mode, orthogonal to the co-polarized fields, has been identified as the source of XP radiation. The physical insight into the XP suppression has been thoroughly discussed and successfully applied for an optimum design. An improved antenna configuration has been realized without any perturbation in the radiating patch or the ground plane. Size, gain, and impedance matching of the proposed antenna have also been considered along with the suppression of XP value. This may be applicable to any conventional working RMPA by introducing very small possible changes. As much as 16 dB suppression of XP radiation is realized in the H-plane without affecting the co-polarized peak-gain value of 5.27 dBi. The proposed concept has been experimentally validated using a set of antenna prototypes. Measured results are closely corroborated with the simulated predictions. (C) 2020 Elsevier GmbH. All rights reserved

The Circular Microstrip Patch Antenna (CMPA) with Circular and Rectangular Slot Etched Ground Plane for Wireless Communication (HiperLAN/1 and HiperLAN/2)

In this paper, we propose a design of Circular Microstrip Patch Antenna (CMPA) with a circular slot with optimised radius 2.5 mm, and rectangular slot of optimised dimensions of length 10 mm and width of 0.5 mm are etched on the ground plane as Defected Ground Structure (DGS) similar to φ (phi) shape. The DGS concept is used to improve the bandwidth, impedance matching and the relocation of resonant frequency to make the compact CMPA. The size reduction of about 24% is achieved compared to the actual area required to resonate at 5.5 GHz. The bandwidth 600 MHz with respect to centre frequency 5.42 GHz which covers wireless bands such as HiperLAN/1 and HiperLAN/2. The percentage bandwidth of 11.07% and the average gain of 4 dBi are achieved

The wideband printed monopole antenna using defected ground structure for S and C band applications

In this Paper, a wideband printed monopole antenna (PMA) using defected ground structure has been proposed for S and C band applications. The conventional PMA is designed with the center frequency of 4 GHz using low-loss dielectric substrate Glass Epoxy (FR4) with dielectric constant (εr)= 4.4 and substrate thickness of 1.575mm. The band width of this PMA is enhanced by etching the two square shaped slots in the ground plane. The dimensions and the positions of the DGS slots are finalized by thorough optimization. The simulation results demonstrate more than 4.3 dBi peak gain with wide bandwidth of 5.2 GHz and ideal monopole radiations. The prototypes are fabricated and the experimental validation of the simulation results is under process

The E-shaped patch to enhance the bandwidth of printed monopole antenna for UWB

In this Paper, a printed monopole antenna (PMA) with an E-shaped patch has been proposed for UWB applications. The conventional PMA is designed with the center frequency of 6.77 GHz with wide bandwidth. The bandwidth is enhanced to cover the UWB band by modifying the rectangular patch in to E-shape. The rectangular slots in E-shape generates the resonating modes and it will help to enhance the bandwidth to cover UWB. The simulations demonstrate more than 3.99 dBi peak gain with UWB bandwidth (3.1- 10.6) GHz and excellent monopole radiations in both principal planes. A prototype has been fabricated using commercially available low-loss dielectric material FR4 (glass epoxy) with dielectric constant (εr)= 4.4. The experimental validation of predicted simulation results is under process