Improved polarization purity for circular microstrip antenna with defected patch surface

Abstract

A simple and compact microstrip antenna of circular geometry with circular cut defected patch surface has been proposed for significant suppression of cross-polarized (XP) radiation compared with maximum co-polarized gain without affecting the co-polarized radiation pattern at its dominant mode. This will enhance the polarization purity in the radiation performance of the proposed antenna. About 27–28 dB isolation between co-polarized and XP radiations is achieved with the proposed structure. The present structure is simple and easy to develop commercially. The investigation of the new structure is carried out with a view to eliminate orthogonal resonance, which is generally attributed for high XP radiation from the microstrip patch antenna with conventional circular geometry. Comprehensive study on the resonance and radiation characteristics of the new geometry is presented. The present investigation provides an insightful visualization-based understanding of XP suppression with the present structure.

A compact, ultrawide band planar antenna with modified circular patch and a defective ground plane for multiple applications

“…Perfect matching over the entire bandwidth is reported by introducing a circular disk elements in the radiator, UWB characteristics has been reported . For achieving the UWB characteristics for multiple applications, microstrip‐fed antenna designs and circular and elliptical coplanar fed slots have been suggested . Two bands (2.4‐6.1 GHz and 9.4‐13.8 GHz) have been achieved with parasitic slot and patch .…”

“…Bandwidth enhancement was reported due to tilted patch and defected partial ground plane . By introduction of CPW‐fed circular slot, broadband characteristics have been achieved with increased radiation performance . By reducing the ground plane effects by cutting a notch from the radiator in the small printed antenna, the UWB characteristics have been demonstrated .…”

“…15,16 For achieving the UWB characteristics for multiple applications, microstrip-fed antenna designs and circular and elliptical coplanar fed slots have been suggested. 17,18 Two bands (2.4-6.1 GHz and 9.4-13.8 GHz) have been achieved with parasitic slot and patch. 19 Due to the introduction of a crossslot in patch and a T-shaped element in ground plane, the resulting wideband antennas show stable radiation pattern.…”

A compact ultra‐wide band planar antenna with corrugated ladder ground plane for multiple applications

“…UWB characteristics has been achieved by introducing circular disc patches in the antenna . Broadband characteristics are achieved by CPW‐fed circular slot in the antenna . Such a large bandwidth is reported due to impedance matching at the higher frequencies.…”

Improved Cross-Polarized Radiation and Wide Impedance Bandwidth From Rectangular Microstrip Antenna With Dumbbell-Shaped Defected Patch Surface

“…1. Defected patch structure to improve XP radiation performance is relatively new technique and firstly it is employed for circular patch geometry by present authors [16]. Earlier, no literatures are found where XP reduction issues are addressed by cutting slots on the patch.…”