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Abstract In this paper, A novel four-pole
microstrip bandpass filter (BPF) with sharp
attenuations and wide stopband is developed
through a combined use of composite
resonators and stepped impedance resonators (SIRs).
By using a full-wave
electromagnetic simulator, the filter is designed
with a midband frequency of 1.0 GHz
and a fractional bandwidth of 2%. The measured
frequency response of the filter
agrees well with the simulated result, and shows
a transmission zero at about 0.9GHz
,1.1GHz, and 1.15GHz, respectively. The
transition from the passband to the stopband
is thereby sharp and deep. Moreover,a very wide
stopband is observed and
it is found that up to approximately 6.7GHz (6.7f0),
the stopband attenuations are
larger than 30dB.
Keyword - Bandpass filter, composite resonator,
stepped impedance resonator,
transmission zero, wide stopband
 ・A
Novel Bandpass Filter with Sharp Attenuations and
Wide Stopband Developed Through the Combined Use
of Composite Resonators and Stepped Impedance
Resonators
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