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Rotationally symmetric microstrip-line millimetre-wave bandpass filter with two transmission zeros

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3 Author(s)
Wong, S.W. ; Coll. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China ; Chen, Z.N. ; Chu, Q.-X.

A rotationally symmetric short-circuited stub-loaded structure is proposed. This structure is used to design a dual-mode microstrip-line bandpass filter. Moreover, two transmission zeros are generated near the lower and upper cutoff frequency edges of operating millimetre-wave bands. As design examples, the in-band and out-of-band performances of one filter prototype using single layer microstrip-lines have been designed and experimentally examined. The measured results show that the filter achieves a passband insertion loss of 0.97 dB at 40 GHz and lower- and upper-stopband rejection of larger than 24 dB.

Published in:

Electronics Letters  (Volume:47 ,  Issue: 22 )