Bandwidth Enhancing Sleeve-Arm Feed for Patch Antenna and its Characteristic Modes Analysis

摘要

Characteristic modes analysis (CMA) provides an antenna's radiation potential with clear physical insights. This paper applies the analysis to show the mechanisms of expanding the bandwidth of a rectangular patch antenna by applying a new feeding structure. Simulated results proved a higher order mode was brought down to a lower frequency and worked with the fundamental mode by tuning the physical dimensions of a new sleeve-arm feeding architecture. The new feeding achieved over 35% of fractional bandwidth from 3.13 GHz to 4.54 GHz, in which and boresight Gain>4.8 dBi.