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Optimization-Free Design Equations for Narrowband Equal-Division Filtering Power Divider With Pre-Specified Filtering Response and Wideband Isolation

Authors
Lee, BoyoungNam, SeunggooLee, Juseop
Issue Date
7월-2019
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
Filtering power divider; design equations; design theory; wide isolation performance
Citation
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, v.66, no.7, pp.2496 - 2507
Indexed
SCIE
SCOPUS
Journal Title
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume
66
Number
7
Start Page
2496
End Page
2507
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/64616
DOI
10.1109/TCSI.2019.2898465
ISSN
1549-8328
Abstract
In this paper, we present completely analytic design equations for a narrowband filtering power divider with an excellent isolation performance over a wide frequency range. For providing the complete design equations, the even-odd mode analysis on the circuits has been carried out. The design theory and equations allow a filtering power divider containing frequency-independent inverters to have infinite isolation over the entire frequency range. The presented design theory is significant in a sense that it enables designing a filtering power divider with a high isolation over a wide frequency range when the divider contains frequency-variant inverters in practice. Using the closed-form equations, all circuit element values and detailed physical dimensions of filtering power divider can be found based on a pre-specified filtering response. Therefore, our design method can provide a filtering power divider design guideline for the various specifications required by communications systems. For verifying the presented design method and analytic design equations, a third-order lumped-element narrowband filtering power divider has been designed, fabricated, and measured. We have also implemented a filtering power divider using microstrip resonators to verify that the presented design method and equations can be applied to distributed-element filtering power divider designs. The measured results have shown a good agreement with theoretical results.
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