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Novel Transmission-Line Circuit Configuration of Cross-Coupled Filter With Negative Coupling
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- Authors
- Hyunjong Choi, Minhyup Song, Juseop Lee
- Issue Date
- 2024-08
- Citation
- IEEE Transactions on Microwave Theory and Techniques, v.72, no.8, pp.4842-4853
- ISSN
- 0018-9480
- Publisher
- Institute of Electrical and Electronics Engineers
- Language
- English
- Type
- Journal Article
- Abstract
- This article presents a new quadruplet filter structure with a negative coupling capable of producing a pair of transmission zeros (TZs). More specifically, the presented structure is composed of coupled-lines and standalone lines, whose parameters are fully given in terms of the normalized coupling values, the center frequency, and the bandwidth. Hence, a filter design using our quadruplet filter schematic does not necessitate carrying out the coupling tests for finding initial dimensions of the lines constituting a filter. In addition, the length of all coupled-lines and standalone lines is a quarter wavelength, which makes a filter have no undesirable resonant peaks close to the passband. For demonstrating the presented filter structure, this work also provides the discussion on a microstrip filter example centered at 2 GHz having 7.5% bandwidth.
- KSP Keywords
- Center frequency, Circuit configuration, Coupled line, Cross-coupled filter, Filter Design, Microstrip filter, Negative coupling, Transmission line