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Compact microstrip square-loop dual-mode bandpass filter design with wideband response

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4 Author(s)
Ting-Shan Lv ; Wireless Commun. Lab., Univ. of Macau, Macau ; Si-Weng Fok ; Cheong, P. ; Kam-Weng Tam

In this paper, a dual-mode bandpass filter using square-loop resonator is proposed for wideband applications. By introducing two capacitive stepped-impedance inner arms along the square-loop resonator, a wide passband response is achieved. In addition, the degradation of the insertion loss over the passband can be enhanced by a pair of tight coupling feed lines located at two perpendicular positions of the square ring. In order to demonstrate the performance of the proposed filter structure, a prototype filter is designed at 5 GHz with 74% fractional bandwidth. Good agreement is obtained between simulations and measurements.

Published in:

Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on

Date of Conference:

Nov. 30 2008-Dec. 3 2008

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