Design Technique for Multilayered Filters Composed of LC Resonators.

In multilayer filter design, both the parasitic effects and the lack of fine-tunings may result in the error of component values, which has great influences on performance. In this paper, a design technique for multilayer filter composed of LC resonators is proposed. With this technique, influences of the error of component values may be reduced and the design procedure may be simplified. An elliptic filter composed of four LC resonators is used to demonstrate the proposed technique. Three experimental prototypes with different component values were fabricated for comparisons. Very good agreements between measured responses and designed responses can be observed. The measured parasitic resonances are higher than the third harmonic frequency. These facts show the effectiveness of the proposed technique.