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On the Design of Compact Dual Band Rejection Filters using Circular Open Loop Resonators

Keywords: open-loop-resonator , band pass filter , band rejection filter , multi band pass filter

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In this article, we describe the design of band pass and band rejection filter of a circular shape for UWBcommunication applications. The dual band rejection rejection and multiband have been achieved by usingcircular shape multi-armed open-loop resonators. Each resonator pair of arms creates a reject band in the transmission response. Broad band stop is obtained using one circular open-loop resonator By properly adjusting the multireject bands, appropriate multi-transmission bands are created. This filter is fabricated with optimized dimension and tested. The measurement results are compared with simulated results. Both are in closed agreement. The diameter of the circular open loop resonators, its width and spacing are the crucial parameters decide the bandwidth of the signal


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