Optimization-Free Design Equations for Narrowband Equal-Division Filtering Power Divider With Pre-Specified Filtering Response and Wideband Isolation
- Authors
- Lee, Boyoung; Nam, Seunggoo; Lee, 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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