Journal
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
Volume 25, Issue 10, Pages 648-650Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LMWC.2015.2463215
Keywords
Isolation; multiplexer; parallel-coupled line; rejection; transmission zero; triplexer; virtual short
Categories
Funding
- National Science Council of Taiwan [NSC 102-2221-E-415-002-MY3, MOST 103-2622-E-194-008-CC1]
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Design approach for simultaneously achieving impedance matching and enhancing the isolation of multiplexer has been proposed. The channel filters constituting the multiplexer utilize the T-shaped short-circuited resonators as resonant components and short-circuited parallel-coupled lines as inter-stage couplings. The embedded open-ended stubs of resonators intentionally placed along the main transmission path of each channel contribute the virtual-shorts by creating transmission zeros thereby making the matching and isolation improvement possible. A triplexer with satisfactorily high output isolation is designed and implemented to validate the concept.
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