High-Isolation and High-Rejection Microstrip Diplexer With Independently Controllable Transmission Zeros

A high-isolation and high-rejection microstrip diplexer based on the stub-loaded resonators with independently controllable transmission zeros has been presented. The transmission zero is an inherent characteristic of the stub-loaded resonator. By allocating properly these transmission zeros at the...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2014-12, Vol.24 (12), p.851-853
Main Authors: Chen, Chi-Feng, Lin, Cheng-Yu, Tseng, Bo-Hao, Chang, Sheng-Fa
Format: Article
Language:English
Subjects:
Band-pass filters
Bandpass
Bandpass filter (BPF)
diplexer
Diplexers
Filtering theory
Microstrip
Microwaves
Noise levels
Passband
Rejection
Resonant frequency
Resonators
Simulation
Stability
stub-load resonator
transmission zero
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Summary:A high-isolation and high-rejection microstrip diplexer based on the stub-loaded resonators with independently controllable transmission zeros has been presented. The transmission zero is an inherent characteristic of the stub-loaded resonator. By allocating properly these transmission zeros at the specific frequencies, the output isolation and out-of-band rejection of the diplexer can thus be improved simultaneously. For demonstration, a diplexer with third-order Chebyshev bandpass response has been designed and fabricated with microstrip technology. The measured results are in good agreement with the simulated predictions, showing that output isolation and out-of-band rejection both exceeding 70 dB are achieved.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2014.2361684