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access icon openaccess Modelling and validation of a simple and compact wide upper stop band ultra-wideband bandpass filter

A compact ultra-wideband (UWB) bandpass filter (BPF) is proposed based on end coupled microstrip transmission line, defected ground structure and defected microstrip structure. The experimental filter shows a fractional bandwidth of 110% at a centre frequency, with two observable transmission zeros (attenuation poles) at 2.1 and 11.7 GHz. Measured results exhibit an UWB passband from 3.02 to 10.6 GHz with mid-band insertion loss of 1.8 dB and group delay variation <0.45 ns. The BPF achieves a wide stopband with < −18 dB attenuation up to 20 GHz.

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      • 1. Federal Communications Commission: ‘Revision of part 15 of the commission's rules regarding ultra-wideband transmission systems’. Technical Report, ET-Docket 98–153, FCC02–48, April 2002.
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http://iet.metastore.ingenta.com/content/journals/10.1049/joe.2014.0202
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content/journals/10.1049/joe.2014.0202
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