Wideband Cavity-Backed Slot Antenna Based on Multi-Resonant Modes

Abstract

In this paper, a cavity-backed slot antenna (CBSA) with broadband performance is proposed. The design is constructed by three resonators, which consists of two resonances from the stepped slot and one resonance from the cavity. As a result, all of these modes are triggered to move towards similar frequency range each other and simultaneously excited in the single cavity resonator. As such, the impedance bandwidth could be enhanced by utilizing the impedance matching of three modes in proper frequency range. Finally, compared with the traditional single resonant CBSA, the bandwidth (|S11|<-10dB) of the proposed multimode CBSA is enhanced transform 1.4% into 12%. Furthermore, the antenna composed of all metal structure still retains the merits of zero dielectric loss performance.