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Abstract - A novel compact ultra-wideband
(UWB) bandpass
filter (BPF) using a microstrip stepped-impedance
four-modes
resonator is developed in this paper. By
controlling the resonant
frequencies of the first four modes of the
resonator, we get four
transmission poles within the passband of the
filter. Moreover, by
enhancing the coupling between the resonator and
the
input/output feed lines, we obtain two additional
transmission
poles. As a consequence, we realize a UWB
bandpass filter that
has six transmission poles in its passband,
although only one
resonator is utilized. A design method, based on
network analysis
and optimization in the z-domain, is established
to determine the
circuit and geometrical parameters of the filter.
The measured
filtering characteristics of the filter show good
agreement with
the theoretical predictions and satisfy well the
Federal
Communications Commission’s indoor limit.
Index Terms - Ultra-wideband, bandpass filter,
multiplemodes
resonator, transmission poles, z-transform.
・A
Novel Compact Ultra-Wideband Bandpass Filter
Using a Microstrip Stepped-Impedance Four-Modes
Resonator
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