Wideband Omnidirectional Filtering Antenna Based On Coupled-line Structure

Abstract

A novel omnidirectional filtering antenna with great filtering characteristics is presented. Firstly, a wideband bandpass filter (BPF) with Butterworth functional response based on coupled-line structure is designed and numerically analyzed. Then, a disc type omnidirectional antenna is proposed. When they are integrated together by using co-design approach, the signals from BPF couple to the antenna, thus, the omnidirectional filtering antenna is realized. The proposed antenna can provide a good frequency selectivity and high stopband suppression performance.