Miniature High- Double-Spiral

A new class of low insertion-loss miniaturized filters using slot-line resonators is proposed. Miniaturization is achieved by terminating the slot line with a double-spiral inductive termina- tion at both ends. Using this miniaturized resonator, both positive and negative couplings may be realized, and therefore, both stan- dard coupled-line and cross-coupled quasi-elliptic filters are realiz- able. The unloaded of these slot-line filters is considerably higher than that of miniaturized microstrip filters of comparable dimen- sions due to the inherent higher of the slot line. To demonstrate the validity of the design procedures and the performance charac- teristics, two different types of filters were fabricated and tested. One is a four-pole Chebyshev filter and the other is a quasi-elliptic filter where, in each case, the full-wave simulations show very good agreement with measurements.

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