Development of ultrawideband (UWB) communications systems requires the design of many different component functions, including bandpass filters (BPFs) with acceptable selectivity. To serve UWB communications applications, a compact UWB BPF with reasonable selectivity and an integral notched band was fabricated with two interdigital, coupled, three-line structures. Selectivity was improved by adding another signal path loaded by two short-circuit stubs. The filter exhibits sharp rolloff to its
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