Miniaturized dual-band zeroth-order resonance antenna with zero refraction characteristic

Abstract

A novel dual-band patch antenna based on metamaterial transmission line (TL) with zero refraction characteristic is proposed. The metamaterial TL proposed is constructed by a series capacitive gap between two metal patches combined with a complementary single Archimedean spiral resonator (CSASR) etched in the ground plane. The equivalent circuit model is applied to analyze the proposed antenna. The dispersion curve is calculated and analyzed, indicating that the TL has two balanced zeroth-order resonant (ZOR) frequencies on which the antenna operates. The particularity is that the proposed TL performs zero refraction (ZR) characteristic in the working bands. For verification, an antenna sample is fabricated and measured. Numerical and experimental results agree well with each other. The two operating bands are respectively 420 and 440 MHz lower than those of the same sized antenna with a traditional complementary split ring resonator (CSRR).