Polarization Diverse Meandered Slot and Ring Antenna with Sum and Difference Beam Patterns

A novel multi-polarization 8-port slot antenna is presented in this work, designed to generate both sum and difference beam patterns. Moreover, based on this multi-port feeding, operation with both dual-vertical and dual-horizontal linear polarizations is made possible and this can support simultaneous transmission and reception. The antenna design features a configuration of meandered slots and micostrip rings on its upper layer. This multi-layer antenna exhibits a good impedance match at 2.4 GHz, achieving a gain of approximately 6 dBi. It is capable of generating sum and difference co-polarized beam patterns by simultaneously exciting adjacent ports. The design also utilizes a shared aperture for all 8 ports, thereby reducing complexity and size requirements. The performance of the antenna was also evaluated through simultaneous port excitation with isolation values in excess of 10 dB. Applications include in-band full-duplex antenna systems which require polarization diversity as well as sum and difference beam patterns.