A Dual-Circularly Polarized Gap Waveguide-Based Linear Array Antenna for 60 GHz-Band

This paper deals with the design of a dual-circularly polarized (CP) linear array antenna based on gap waveguide for 60 GHz band. The radiating array is based on dual-slot fed cavities with septum polarizers to achieve both left hand circular polarization (LHCP) and the right hand circular polarization (RHCP) radiations. The simulated input reflection coefficient and gain of the proposed linear array antenna are below -10 dB and higher than 18.1 dB from 58 to 62 GHz, respectively. Also, the AR is less than 3 dB over the operating bandwidth.

I. Introduction

Recently millimeter wave frequency band has got the attention of the research community due to the availability of large continuous bandwidth which is suitable for many future wireless applications. With the development of novel technologies suitable for this frequency band, various wireless technologies have been proposed, such as high-speed internet, high-definition multimedia interface, high-definition video streaming, automotive radars, and wireless gigabit Ethernet [1]. For most of these wireless systems, the antennas play a critical role and should have high radiation efficiency, broad bandwidth properties, and high gain.