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Compact bandpass filter with sharp cut-off using grooved parallel coupled microstrip lines
Conference paper

Compact bandpass filter with sharp cut-off using grooved parallel coupled microstrip lines

J. Marimuthu, A. Abbosh and B. Henin
2013 IEEE Antennas and Propagation Society International Symposium (APSURSI)
2013 IEEE Antennas and Propagation Society International Symposium (APSURSI) (Orlando, FL, 07/07/2013–13/07/2013)
2013
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Abstract

A compact novel bandpass filter with sharp cut-off frequency and two transmission zeros is proposed. To be compact in size, the proposed filter is constructed using L-shaped grooved parallel coupled microstrip line (PCML) with appropriate middle resonator and short circuited via. The via is introduced to initiate a sharp lower cut-off frequency with a transmission zero at a specific frequency. The design is further improved by placing a groove at the center of the PCML structure. The groove creates sharp upper cut-off frequency with a transmission zero at specific frequencies. The filter designed at the center frequencies 2.4 GHz with bandwidths of around 400 MHz and sharp cutoff bands with 50% reduction in overall size compared with the traditional design approach.

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