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Balanced dual-band bandpass filter using microstrip resonator loaded with lumped-elements

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5 Author(s)
Young-Ho Cho ; Dept. of Electron. Eng., Sogang Univ., Seoul, South Korea ; In-Sung Jeon ; Xu-Guang Wang ; Sang-Won Yun
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We present a balanced dual-band bandpass filter (BPF). The proposed filter is established by using half-wavelength resonators loaded with a lumped series resonator. To verify the operation of the proposed resonator, the differential-and common-mode equivalent circuits are extracted and studied. Moreover, to enhance the common-mode suppression, a lumped resistor is added to the half-wavelength resonator with the lumped series resonator. Based on the proposed circuit, the desired differential-mode dual-band response is easily realized and the level of common-mode noise is minimized simultaneously. Two-pole balanced dual-band BPF with center frequencies of 1.3 GHz and 2.75 GHz is designed and the measured results agree well with simulated results.

Published in:

Microwave Conference Proceedings (APMC), 2011 Asia-Pacific

Date of Conference:

5-8 Dec. 2011