The design of bandpass filter that uses disk resonator and parallel coupled lines

In this paper, the bandpass filter design that uses a disk resonator and parallel coupled lines is proposed. The purpose of design is to apply the disk resonator's equivalent circuit which has been introduced in our previous paper [1]. The filter design method is based on the general J-inverterbased equivalent circuit of 2-pole bandpass filter. The design relative equations have been derived and to verify the accuracy and practicality of the design method, the 2-pole bandpass filter having a center frequency of 2.2GHz and bandwidth of 20MHz has been designed. As results, the simulated performances of Circuit and EM-simulation show an excellent agreement with each other.