期刊
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
卷 28, 期 9, 页码 798-800出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LMWC.2018.2856400
关键词
Absorptive filter; balanced filter; bandpass filter (BPF); bandstop filter (BSF); differential-mode filter; dual-band filter; multiband filter; reflectionless filter; stub-loaded filter
资金
- Spanish Ministry of Economy and Competitiveness [TEC2017-82398-R]
- National Science Foundation [1731956]
- National Natural Science Foundation of China [6182200033]
Microwave planar balanced single-/dual-band bandpass filters (BPFs) with symmetrical quasi-reflectionless differential-mode behavior are presented in this letter. They are made up of a direct single-/dual-band BPF branch with virtually short-ended stubs in differential-mode operation, whose input and output accesses are loaded with stub-loaded-type single-/dual-band bandstop filter (BSF) branches that are terminated with a resistor. These BSF branches exhibit a quasi-complementary transfer function with regard to the one of the BPF branch and absorb the differential-mode inputsignal energy not transmitted by the filter to achieve quasi-reflectionlesss capabilities. The theoretical foundations of the proposed balanced quasi-absorptive single-/dual-band BPFs and synthesis examples are given. Furthermore, for experimental-demonstration purposes, microstrip prototypes of 3-GHz secondorder single-band and 2.85/3.15-GHz first-order dual-band BPFs are manufactured and characterized.
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