SUMMARY A novel method is proposed to
synthesize dual-band bandpass
filters (BPFs) from a prototype lowpass filter.
By implementing successive
frequency transformations and circuit conversions,
a new filter
topology is obtained which consists of only
admittance inverters and series
or shunt resonators, and is thereby easy to be
realized by using conventional
distributed elements. A microstrip dual-band BPF
with central frequencies
of 1.8 GHz and 2.4 GHz is designed and fabricated
using microstrip lines<
and stubs. The simulated and measured results
show a good agreement and
validate thereby the proposed theory.
key words: admittance inverter, dual-band filter,
frequency transformation
,microstrip line
・Synthesizing
Microstrip Dual-BandBandpass Filters Using
Frequency Transformation and Circuit Conversion
Technique
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