Abstract
In this paper, a microstrip combline bandpass fllter (BPF) with a broad upper stopband performance is presented. The proposed fllter is based on the design of a bandpass fllter cascaded with a defected microstrip structure (DMS) bandstop fllter. The bandstop characteristic is realized using T-shaped DMS at the external input and output coupling transformers. The measured and simulated electrical performances are in good agreement and demonstrate broad upper stopband bandwidth. The proposed fllter is also compared with the characteristic of a conventionally designed fllter to highlight the advantages of the proposed approach.
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