In this work, dielectric resonator (DR) filters consisting of several cascaded resonators were investigated. The electromagnetic energy propagating in the TEM mode was transmitted through an air hole between neighboring resonators. The filter response as a function of the dimension and position of the air holes along the propagating direction are analyzed and discussed. Experimental studies on the microwave properties for fabricated filters are presented. In addition, the optimum design of a three-stage resonators is proposed. Based on experimental results, the one that could best fit the requirements of a mobile communication system at frequencies from 800 MHz to 900 MHz was found to have the following features: central frequency f0=819.5 MHz, S11=-31.13 dB, S21=-2.178 dB, bandwidth=25 MHz, attenuation at 750 MHz>50 dB. The dimensions of the filter were designed to be 24 mm×8 mm×10 mm.
|Number of pages||8|
|Journal||Proceedings of the National Science Council, Republic of China, Part A: Physical Science and Engineering|
|Publication status||Published - 1994 Sep 1|
All Science Journal Classification (ASJC) codes