Stub-loaded square-ring antenna for circular polarization applications

Abstract

In this paper, a simple mechanism for circular polarization (CP) operation is introduced for a square-ring antenna. The proposed antenna consists of a simple square ring with a short-circuited stub and a T-shaped feeding structure. A square-ring antenna is loaded with a short-circuited stub. This antenna shows dual resonance (f₁ and f₂) with linear polarizations that are orthogonal to each other. The second resonant frequency (f₂) is controlled without varying the first resonant frequency (f₁) by adjusting the dimensions of the short-circuited stub. By choosing suitable dimensions for the stub, the two resonant frequencies are close to each other, and two orthogonal resonant modes with a 90° phase difference are excited. As a result, good CP is achieved.

Keywords:

• Square-ring antenna
• circular polarization (CP)

Disclosure statement

No potential conflict of interest was reported by the authors.