Wide bandwidth microstrip antenna with defected patch surface for low cross polarization applications

Abstract

A simple and single element wide slot dipole loaded shorted rectangular microstrip antenna has been proposed and investigated experimentally for broad impedance bandwidth and improved cross polarized (XP) radiation compared to maximum co‐polarized (CP) gain without changing the co‐polarized (CP) radiation pattern. Around 23‐35 dB isolation between CP and XP radiation along with 25% impedance bandwidth is achieved with the proposed structure. The measured gain of the antenna is around 6.2 dBi over the entire band. The present antenna is very simple and easy to manufacture. Unlike the other structures, the present one is free from back radiation in terms of XP fields. The design of the antenna structure is theoretically justified and rigorously analyzed. The present investigation provides an insightful, clear visualization‐based understanding of the concurrent improvement in both the impedance bandwidth and XP performance with the present structure.

Design and analysis of wideband U-slot patch antenna with U-shaped parasitic elements

“…4.0 mm. The reason for the increase of f 1 is similar to the case for parameter G V , that is, it can also be derived from (10) to (12) that the increase of G U leads to a decrease of C V when other parameters in Table 1 are fixed, while C 1 , C P1 , and L 1 are almost kept unchanged, thus C m is decreased. From (26), the resultant upward frequency shifts for f 1 is observed.…”

“…Many researchers have devoted to broaden the bandwidth, and some techniques have been proposed and applied, including substrate with low permittivity (e.g., air substrate) and increasing the substrate thickness; incorporating coplanar parasitic elements 1,2 or stacked structures; 3,4 specific feeding techniques, such as L-shaped probe feed, 5 T-shaped probe feed, 6 and crossshaped probe; 7 cutting slots in the patch, such as U-slot, 8,9 E-shaped slot, 10 V-slot, 11 and other shapes of slots. [12][13][14][15] However, microstrip antennas with low permittivity substrate have the disadvantage of large volume, which limits its application in some space limited cases. Increasing the substrate thickness has the limitation of further increase in bandwidth due to the inductance from the fed probe.…”

Low Cross-Polarization Improved-Gain Rectangular Patch Antenna

“…In addition, the size of the aperture type unit cell used to develop the proposed superstrate is nearly 27% compact than the reference [23] unit cell which significantly reduces the overall structure. The proposed work uses the DPS for the narrowband application but it is also effective for the wideband cross-polarization reduction without affecting the gain of the antenna, as reported in [24]. The width of a rectangular patch antenna is shorted to the ground using a shorting-pin and an optimized thin slot is incorporated near to the shorting-pin, resulting in co-cross-polarization isolation of more than 30 dB in the elevation plane.…”

Novel double fractal patches structure Antenna-in-Package based on LTCC technology for 2.4 GHz applications

“…However, dielectric antennas are also facing the problem of impedance bandwidth, especially in high dielectric constant material antennas. For resolving this issue, many researches have been made in recent years, for example, a meander line structure in, a ladder structure in and other structures in …”

“…For resolving this issue, many researches have been made in recent years, for example, a meander line structure in, 8,9 a ladder structure in 10,11 and other structures in. 12,13 In this article, a novel AiP system based on LTCC technology for 2.4 GHz applications is designed. Double fractal antennas structure is designed in antenna part for realizing miniaturization, air cavities are designed for realizing broadband and a packaging cavity for integrated with components and IC chips.…”