Balanced and balun diplexers designed using center-grounded uniform-impedance resonators

ABSTRACT A balanced diplexer and a balun diplexer, both with high isolation, are proposed in this article. First, a balanced bandpass filter (BPF) operating in GSM (with a center frequency of 1.92 GHz) and the other in WLAN (with a center frequency of 2.45 GHz) were designed using ordinary uniform‐i...

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Bibliographic Details
Published in:Microwave and optical technology letters 2014-03, Vol.56 (3), p.555-559
Main Authors: Lee, Ching-Her, Hsu, Chung-I G., Wen, Pi-Hung
Format: Article
Language:English
Subjects:
balanced diplexer
Balancing
balun diplexer
center-grounded uniform-impedance resonator
high isolation
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Summary:ABSTRACT A balanced diplexer and a balun diplexer, both with high isolation, are proposed in this article. First, a balanced bandpass filter (BPF) operating in GSM (with a center frequency of 1.92 GHz) and the other in WLAN (with a center frequency of 2.45 GHz) were designed using ordinary uniform‐impedance resonators (UIRs) and center‐grounded UIRs. Next, the two balanced BPFs were combined through two T‐junctions to form a six‐port balanced diplexer. Finally, a five‐port balun diplexer was obtained by removing from the balanced diplexer one of the two T‐junctions along with the microstrip feeding lines connected to it and by carefully adjusting the structural dimensions of the other T‐junction. A satisfactory agreement is validated between simulated and measured results. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:555–559, 2014
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.28138