A SINGLE-LAYER SINGLE-PATCH DUAL-POLARIZED HIGH-GAIN CROSS-SHAPED MICROSTRIP PATCH ANTENNA

Abstract

This letter introduces a microstrip patch antenna with a single layer and a single patch. The antenna is dual-polarized and has a high-gain design. The design starts with a microstrip patch antenna in the form of a cross, with the characteristic of high gain. A model of an antenna array is developed to provide an understanding of its mechanism and the theoretical constraints. Additionally, the central portion of the patch in the form of a cross is eliminated in order to decrease the degree of sidelobes. Subsequently, a high-gain antenna with dual polarization is developed using the modified cross-shaped patch as its foundation. Furthermore, a strip in the form of a cross is used to enhance isolation. Ultimately, a prototype is constructed and assessed to validate our concept. The tests indicate that the suggested antenna has an impedance bandwidth of 1.8% from 4.74 to 4.83 GHz, with a maximum realized gain of 12.47 dBi at 4.77 GHz. The isolation between the two ports exceeds 24.8 dB inside the passband. The suggested antenna has a compact size, measuring 1.44λ0 × 1.44λ0 × 0.024λ0.