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Synthesis of dual-band bandpass filters using successive frequency transformations and circuit conversions

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6 Author(s)
Xuehui Guan ; Sch. of Commun. & Inf. Eng., Shanghai Univ., China ; Zhewang Ma ; Peng Cai ; Kobayashi, Y.
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A novel method is proposed to synthesize dual-band bandpass filters (BPFs) from a prototype low-pass filter. By implementing successive frequency transformations and circuit conversions, a new filter topology is obtained which consists of only admittance inverters and series resonators, and is thereby easy to be realized by using conventional distributed elements. A dual-band BPF with center frequencies of 1.8GHz and 2.4GHz is designed and fabricated using microstrip lines and stubs. The simulated and measured results show a good agreement and validate the proposed theory.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:16 ,  Issue: 3 )