A 60 GHz Circularly Polarized Multilayer 16-Element Antenna Array

This paper presents an antenna array that achieves circularly polarized radiation within the span of frequencies between 57.24 GHz and 64.8 GHz with a realized gain of 14.2 dBic. The presented array is composed of 16 radiating elements that are stacked on a multilayer dielectric topology to achieve compact size and enable the appropriate phase distribution between the radiating elements. Each radiating element is further composed of four sub-elements that are series-fed with sequential rotation through an aperture- coupled feeding technique. The antenna array is fabricated and tested to prove its validity in terms of impedance matching, realized circularly polarized gain, and axial ratio bandwidth.