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This paper reports an investigation of performance enhancement for electronically tunable microstrip filter. Based on the effects of lossy components on passband response of a bandpass filter, a new concept to improve the performance (passband flatness and selectivity) is proposed. Unlike other techniques published, this new concept results in nonuniform Q distribution by loading lumped elements to...
This paper presents a new type of microstrip quasi-elliptic function bandpass filter built in parallel feed configuration with a pair of open-loop dual-mode resonators. By employing this new coupling scheme, it is flexible to implement different single- or dual-band filtering characteristics. As an example, a three-pole quasi-elliptic function filter of this type with a finite-frequency transmission...
A miniaturized microstrip dual-mode filter with different responses is developed in this letter. A coupling and routing scheme is presented to model the operations of this filter. The new filter reduces the occupied area up to 33% compared with the conventional one at 1.89 GHz. Meanwhile, the proposed circuit enables the second harmonic response to be effectively suppressed. A demonstrator filter...
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