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In this paper, a new synthesis method for parallelcoupled line bandpass filter is presented. Design formulas are derived for a third-order bandpass filter with arbitrary coupledline image impedance. These formulas are more accurate than the conventional method to address the prediction bandwidth. Third-order parallel-coupled bandpass filters are designed and simulated to validate the theory.
A new miniature Dual Behavior Resonator (DBR) topology with capacitors placed in series between the feed lines and the stubs is demonstrated. Design equations are derived. For a proof-of-concept, a first-order prototype with a 1-GHz working frequency and 70% size reduction is realized, measured and compared to a classical DBR. The design method is simpler and more accurate compared to a miniaturized...
This paper describes and formulates a miniaturization approach for bandpass filters. Based on an illustrated miniaturizing principle of stubs, the general fundamental equations for a miniaturized narrow bandpass DBR filter are derived for the first time. Equations for the transmission zeros, the fundamental resonance frequency and the higher order resonance frequencies (poles) are, thus, provided...
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