Compact Bandpass-Filtering Response Power Dividers with High Isolation and High Frequency Selectivity

Abstract

ABSTRACTA compact power divider integrated filtering response with high isolation and high frequency selectivity is presented in this article. The four short-circuited-loaded quarter-wavelength resonators are employed to construct the presented compact power divider. The presented divider can be viewed as an integration of a second-order dual-mode bandpass filter and the quasi-Wilkinson power divider. In order to improve the frequency selectivity of passband, the cross-coupling circuits between input port and output ports are used. A power divider with bandpass-filtering response is designed, fabricated, and measured. The operating central frequency of the fabricated power divider is at 2.43 GHz. The measured 3-dB insertion loss bandwidth is about 180 MHz and the measured minimum insertion loss is about 0.85 dB. The measured isolation between the output ports is around 30 dB.