A self‐quadruplexing antenna for quad‐band wireless applications

Abstract

This paper presents a compact self‐quadruplexing antenna (SQA) designed through the utilization of substrate‐integrated rectangular cavity (SIRC) technology for quad‐band applications. It operates at four distinct frequencies, which are 3.29, 4.27, 5.20, and 5.72 GHz. The antenna's maximum gains were estimated to be 5.09, 6.46, 5.79, and 6.21 dBi at their respective operating frequencies. The proposed antenna has minimum 24.42 dB isolation among the any two resonance frequencies. Moreover, variation in the patch length enables individual control over all resonant frequencies. The proposed antenna exhibits high isolation, compactness, and independent impedance control, making it well‐suited for compact and planar radio frequency systems.