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This paper presents optimized balanced microstrip filters, in terms of size and design simplicity, by combining multi-section mirrored stepped impedance resonators (SIRs) and interdigital capacitors. The mirrored SIRs provide the necessary transmission zeros (for both the differential- and common-mode responses) to simultaneously achieve a broad stopband for the differential mode and efficient common...
In this work, it is shown that complementary spiral resonators (CSRs) etched in the ground plane of a microstrip line are useful for the implementation of band pass filters with very small dimensions and wide stop bands. By combining the CSRs with two series capacitive gaps and inductive vias, two transmission zeros arise. By properly allocating such transmission zeros at both sides of the pass band...
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