Two Compact Resonators for Microstrip Equalizers
A rectangular spiral microstrip resonator and a miniaturized hairpin resonator are proposed for use in microstrip planar equalizer respectively. The whole circuit area of the proposed resonators are smaller than the conventional resonators. A high frequency structure simulator is used to show that these two compact resonators are suitable to realize microstrip planar equalizer. Simulated results indicate that the equalizer with hairpin resonator can be frequency tunable; and the equalizer with spiral resonator not only can be frequency tunable but also can be attenuation tunable, this can solve the frequency and attenuation offset during the fabrication. At last, a microstrip equalizer composed of this spiral resonator is designed and analyzed, the experiment results are also given in the paper.