New Concept for Designing of Compact Parallel Coupled Bandpass Filter

This paper presents the design procedure of a bandpass filter based on parallel coupled half wave length resonator concept with full length coupling. For the purpose of miniaturization and to get high coupling the new model of parallel coupled bandpass filter has been introduced. Here, the third resonator is placed just beneath the first one & fifth beneath the third one. Similar condition is for even order resonators. Here, area of the microstrip filter is very less, i.e., it is a compact structure. Finally a bandpass filter having Fractional bandwidth of 20% is obtained. The proposed BPF filter has been fabricated and measured with an Agilent make vector network analyzer of model N5230A and also good agreement between simulated and measurement results have been obtained.