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Microstrip-line millimetre-wave bandpass filter using interdigital coupled-line

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3 Author(s)
S. W. Wong ; South China University of Technology, People's Republic of China ; Z. N. Chen ; Q. -X. Chu

An interdigital microstrip coupled-line bandpass filter is proposed for millimetre-wave application. A quadruple-mode microstrip-line resonator is designed to constitute the passband. The interdigital coupled-line sections are designed as the input/output network of the resonator. Meanwhile, sharp selectivity of the passband is achieved. As design examples, the in-band and out-of-band performances of a filter prototype using low-cost single-layer microstrip-lines has been designed and experimentally examined. The measured results show that the filter achieves a passband insertion loss of 1.07 dB at 40 GHz, the lower- and upper-stopband rejections are larger than 18 dB and 3 dB fractional bandwidth is 20%.

Published in:

Electronics Letters  (Volume:48 ,  Issue: 4 )