Analysis of cavity back antennas with characteristic modes

Abstract

The objective of the communication is to present the latest advances made by the authors in the design of cavityback directive antennas in the sub-6 GHz band, with Ultra-Wide Band characteristics [1,2]. A thorough study of several open cavity geometries was conducted, resulting in the determination of the characteristic modes, including currents, radiated fields, and frequency response. The theory of characteristic modes has had a great impact, due to its rigor [3] and applicability to antennas in the microwave band [4].