Improvement of Stopband Property of Parallel Coupled Microstrip Bandpass Filters by Use of Open Stubs
Keywords:
Bandpass filer, parallel coupled, spurious response, stub.Abstract
In this paper a novel method is presented for
suppressing spurious response of parallel coupled microstrip
filters. This technique is based on introducing open stubs to the
filter. A third order filter is presented with central frequency at
3GHZ. The filter insertion is less than 1 dB. The harmonic
suppression at the first and second harmonic is more than 20 dB
and 25 dB, respectively. The performance of the new filter is
also compared with characteristic of a conventionally designed
filter to highlight the advantages of the proposed designed filter
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