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Abstract
In this paper, a compact and sharp-rejection low-pass filter is proposed and analyzed. By combining a stepped-impedance shunt open stub and two additional shunt open stubs, a compact low-pass filter with wide upper stopband and very high passband selectivity is realized. Wide stopband and sharp rejection characteristics are achieved by realizing three transmission zeros near the passband edges. This filter demonstrated very good measured characteristics at cut-off frequency ( of 2.49 GHz, including a low insertion loss of
dB, a wide stopband from 2.8 to 7 GHz and an attenuation slope of 49 dB/GHz. Experimental results also show a good agreement with the predicted results.
Acknowledgement
The authors would like to thanks Mr. S.W. Lan for sample preparation. Financial support of this study by the National Science Council of the Republic of China under Grant No. NSC 100-2221-E-272-003 is greatly appreciated.