期刊
2020 IEEE ASIA-PACIFIC MICROWAVE CONFERENCE (APMC)
卷 -, 期 -, 页码 418-420出版社
IEEE
DOI: 10.1109/APMC47863.2020.9331419
关键词
Absorptive filter; balanced filter; bandpass filter (BPF); high selectivity; multilayered circuit; reflectionless filter; vertical transition; wideband filter
资金
- Spanish Ministry of Economy, Industry, and Competitiveness (State Research Agency) [TEC2017-82398-R]
- GOT ENERGY TALENT (GET) fellowship programme
- EU [754382]
A type of input-reflectionless balanced wideband bandpass filter (BPF) using multilayered vertical transitions is presented. By means of two back-to-back cascaded vertical transitions, which are designed with open-circuited microstrip lines and short-circuited two-section microstrip stubs printed on the top and bottom layers, along with two shunt slotline-coupled microstrip sections, a high-order balanced wideband BPF with improved selectivity and intrinsic ideally-perfect common-mode suppression is firstly conceived. Subsequently, by inserting in this circuit two resistively-terminated microstrip T-junctions that are shunt connected with the open-circuited microstrip lines of the vertical transitions, an input-reflectionless behavior for the proposed balanced wideband BPF is then obtained. The RF operational principles of this engineered input-reflectionless balanced wideband BPF are detailed. For practical-validation purposes, a two-layered balanced BPF prototype is fabricated and characterized. It shows a measured differential-mode 3-dB fractional bandwidth of 65.5%, minimum power-matching level of 10.6 dB from DC to 5.2 GHz, and common-mode suppression levels higher than 29.1 dB within the whole passband of interest.
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