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Content Provider | IEEE Xplore Digital Library |
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Author | Hung-Chih Hsu Ching-Her Lee Hsu, C.-I.G. Pi-Hung Wen |
Copyright Year | 2012 |
Description | Author affiliation: Department of Electrical Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan (Hsu, C.-I.G.) || Graduate Institute of Communications Engineering, National Changhua University of Education, Changhua 500, Taiwan (Hung-Chih Hsu; Ching-Her Lee; Pi-Hung Wen) |
Abstract | A new fourth-order balanced dual-band bandpass filter (BPF) designed using partially coupled bi-section λ/2 and λ/4 stepped-impedance resonators (SIRs) is proposed. To obtain the required differential-mode (DM) operation, the BPF is arranged symmetric with respect to the plane of symmetry and all the SIRs are designed to have the same odd-mode resonant frequencies. The common modes of the balanced BPF which are indeed the even modes of the λ/2 SIRs are naturally suppressed since the λ/4 SIRs do not resonate at these frequencies. In addition, the lower-impedance sections of both the λ/2 SIRs and λ/4 SIRs are placed alongside to work as an all-stop coupled-line section in common-mode (CM) operation to achieve a good overall CM response. For the fabricated prototype BPF circuit, the measured minimum insertion losses for the first and the second bands in DM (CM) operation are 2.2 (16.6) and 2.56 (23.75) dB, respectively. The measured CM insertion loss is found greater than 52 dB over the displayed frequency range of 1–7 GHz other than the two DM passbands. |
Starting Page | 244 |
Ending Page | 246 |
File Size | 393246 |
Page Count | 3 |
File Format | |
ISBN | 9781457713309 |
e-ISBN | 9781457713323 |
e-ISBN | 9781457713316 |
DOI | 10.1109/APMC.2012.6421560 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2012-12-04 |
Publisher Place | Taiwan |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Band pass filters Dual band Frequency measurement Couplings Resonant frequency Passband Loss measurement common-mode suppression Balanced dual-band BPF half-wavelength stepped-impedance resonator (SIR) quarter-wavelength SIR differential mode |
Content Type | Text |
Resource Type | Article |
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