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

Ching Her Lee; Chung I.G. Hsu; Pi Hung Wen

doi:10.1002/mop.28138

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

Ching Her Lee, Chung I.G. Hsu, Pi Hung Wen

Graduate Institute of Communication Engineering

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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.

Original language	English
Pages (from-to)	555-559
Number of pages	5
Journal	Microwave and Optical Technology Letters
Volume	56
Issue number	3
DOIs	https://doi.org/10.1002/mop.28138
Publication status	Published - 2014 Mar 1

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1002/mop.28138

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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.",

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