Compact UWB Bandpass Filter With Improved Upper-Stopband Performance

In this letter, a novel ultra-wideband (UWB) bandpass filter with compact size and improved upper-stopband performance has been studied and implemented using multiple-mode resonator (MMR). The MMR is formed by attaching three pairs of circular impedance-stepped stubs in shunt to a high impedance mic...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2009-01, Vol.19 (1), p.27-29
Main Authors: Binyan Yao, Binyan Yao, Yonggang Zhou, Yonggang Zhou, Qunsheng Cao, Qunsheng Cao, Yinchao Chen, Yinchao Chen
Format: Article
Language:English
Subjects:
Applied sciences
Band pass filters
Bandpass filter (BPF)
Bandpass filters
Circuit properties
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Frequency
Frequency filters
High impedance
Impedance
Insertion loss
interdigital couple line
Joining
Joining processes
Microstrip filters
Microstrip lines
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwave filters
Microwaves
multiple-mode resonator (MMR)
Noise levels
Oscillators, resonators, synthetizers
Passband
Performance enhancement
Resonator filters
Retarding
Ultra wideband technology
ultra-wideband (UWB)
upper-stopband
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Summary:In this letter, a novel ultra-wideband (UWB) bandpass filter with compact size and improved upper-stopband performance has been studied and implemented using multiple-mode resonator (MMR). The MMR is formed by attaching three pairs of circular impedance-stepped stubs in shunt to a high impedance microstrip line. By simply adjusting the radius of the circles of the stubs, the resonant modes of the MMR can be roughly allocated within the 3.1-10.6 GHz UWB band while suppressing the spurious harmonics in the upper-stopband. In order to enhance the coupling degree, two interdigital coupled-lines are used in the input and output sides. Thus, a predicted UWB passband is realized. Meanwhile, the insertion loss is higher than 30.0 dB in the upper-stopband from 12.1 to 27.8 GHz. Finally, the filter is successfully designed and fabricated. The EM-simulated and the measured results are presented in this work where excellent agreement between them is obtained.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2008.2008558