Dual-Polarized mm-Wave Antenna Integrated within Microstrip PMC Packaging Cavity Environment

A dual-polarized cavity antenna is proposed within a back-to-back perfect magnetic conductor (PMC) packaging, created for two inverted microstrip feed lines with a common ground. For the x-polarized radiation (RF1), the cavity is excited via a slot etched in the ground, whereas a fork divider directly excites the cavity to generate orthogonal y-polarized radiation (RF2). The design and analysis are performed at 30 GHz. The antenna bandwidth is 3.5 GHz, covering 28.25 - 31.75 GHz with port-to-port isolation better than 40 dB. The broadside unidirectional radiation patterns are symmetrical for both polarizations. The antenna design is compactly restricted within the PMC packaging layers, without additional layers above the top radiating section.