A Low-Profile Polarization-Adjustable Ring Slot Antenna for Millimeter-wave Applications

TL;DR

This paper presents a low-profile, polarization-adjustable ring slot antenna for 28 GHz millimeter-wave applications, featuring high gain, multiple polarization states, and simple design suitable for future wireless systems.

Contribution

It introduces a dual-port, polarization-controllable antenna with a hybrid mode generated by ring slots, offering multiple polarization states without complex feeding networks.

Findings

Maximum gain of 13 dBi at 28 GHz

Supports six polarization types through phase control

Features low-profile, low-cost, single-layer design

Abstract

In this letter, a dual port antenna with polarization adjustability is proposed. The loading effect of four ring slots stimulates a hybrid mode in the antenna that generates eight magnetic monopoles with high gain in boresight. Due to symmetrical configuration, adding a 90 degree-rotated port provides a dual polarized antenna. Through controlling the phase difference between the two ports, six types of polarization can be demonstrated. A prototype is fabricated and measured in 28 GHz. Antenna shows a maximum gain of 13 dBi, X% bandwidth and a good cross-polarization level in all polarization states. Distinct features including low-profile, low-cost, single-layered and no feeding network makes the antenna a suitable candidate for upcoming millimeter-wave applications.