Compact Lowpass Filter with Wide Stop-Band using Open Stubs-Loaded Spiral Microstrip Resonant Cell
关键词:
Low insertion loss, lowpass filter, microstrip resonator cell, open stubs-loaded, wide stop-band摘要
In this paper, a compact lowpass filter using open stubs-loaded spiral compact microstrip resonant cell (OSL-SCMRC) is presented. The proposed resonator is implemented to design the lowpass filter with the wide and high out-of-band rejection in the stop-band region. The lowpass filter has the insertion loss from DC to 5.29 GHz better than -0.1 dB and the return loss better than - 19.3 dB. Moreover, the lowpass filter is shown to suppress the harmonics with -20 dB attenuation level from 6.71 GHz to 16.73 GHz result in a 10.02 GHz rejection band. The proposed resonator has an improved slow-wave factor, low radiation and scattering, with a compact size. The filter is designed, fabricated and measured. There is a good agreement between the measured and the simulated S-parameters.
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参考
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