RF and microwave bandpass filters are key components for most of the recent communication systems. A conventional hairpin-line resonator size is normally very large. A Multifolded hairpin line resonator filter helps to reduce the size, if the required selectivity characterstrics are not critical. This paper presents the design, simulation, optimization and test results of a new class of a 4-pole multi-fold hairpin line microstrip resonator filter with 60-65% reduction in size and moderate selectivity compared to the conventional hairpin line resonator filters for L/S band communication systems. General TermsMicrostrip, substrate, RT-duroid, thermal conductivity, surface resistivity, heat distortion temperature.

We have realized four-pole, quarter wave, parallel coupled, microstrip band pass filters at 4035 ± 40 MHz, using high-temperature superconducting thin films of YBCO on both sides of 0.5 mm thick LaAlO3 substrates. The achieved results are close to the predicted results except for the return loss. Detailed results are presented in the paper.

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