Design of an equal division single-band filtering power divider based on ring resonator band-pass filter

Abstract

In this paper a ring resonator (RR) based band pass filter (BPF) is integrated in the power divider for simultaneous filtering and equal division functions. The proposed co-axial feeding mechanism for the RR ensures the BPF response. Exploiting band-pass characteristics and matching the filter to 70.7 Ω, the RR BPF is integrated in place of the conventional quarter wave transformer in the power divider. In order to ensure good output isolation and return loss (RL), a 50Ω extended transmission line and a resistor is used. Experimental validation was carried out by fabricating the proposed filtering divider. The simulated and measured S-parameter responses were found in good agreement at the fundamental design frequency of 3 GHz and fractional bandwidth of 15%.