Maciej Jasinski;Adam Lamecki;Roberto Gómez-García;Michal Mrozowski
{"title":"RF-Input-Quasi-Reflectionless Filtering Dispersive-Delay Structures Based on Complementary-Diplexer Architectures","authors":"Maciej Jasinski;Adam Lamecki;Roberto Gómez-García;Michal Mrozowski","doi":"10.1109/TMTT.2025.3542251","DOIUrl":null,"url":null,"abstract":"The theoretical design and practical development of a family of high-order bandpass filtering dispersive-delay structures (DDSs) with radiofrequency (RF)-input-quasi-absorptive capabilities are presented. They consist of RF complementary-diplexer-based circuits, in which the main channel is a reflective-type bandpass filtering DDS and the resistively terminated auxiliary channel exhibits a bandstop filtering response with a quasi-complementary frequency profile with regard to that of the main channel. In this manner, the out-of-band/non-transmitted RF-input-signal power echoed by the main channel is mostly dissipated by the loading resistor of the auxiliary channel. As a fundamental constituent circuit block arranged in in-series-cascaded configurations for high-order reflective-type bandpass filtering DDS realizations, a triplet coupled-resonator network with one frequency-dependent coupling (FDC) is used. Its transmission properties are nearly transferred to the total RF-input-quasi-absorptive bandpass filtering DDS, which preserves the patterned group-delay/phase-variation response of the main channel. The theoretical design method of the devised RF-input-quasi-reflectionless bandpass filtering DDSs is detailed and exemplified with fifth- and seventh-order synthesis examples. It is based on a two-step design process, as follows: 1) separate polynomial/coupling-matrix synthesis of the main and auxiliary channels for the desired bandpass filtering DDS specifications in transmission and the complementary bandstop filtering functionality, respectively, and 2) coupling-matrix optimization of the overall RF-input-quasi-absorptive bandpass filtering DDS. Furthermore, for experimental demonstration purposes, a 2-GHz microstrip prototype of the previously designed RF-input-quasi-reflectionless fifth-order filtering DDS that features a stepped-type group-delay response is manufactured and characterized.","PeriodicalId":13272,"journal":{"name":"IEEE Transactions on Microwave Theory and Techniques","volume":"73 6","pages":"3319-3333"},"PeriodicalIF":4.5000,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Microwave Theory and Techniques","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/10907267/","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
The theoretical design and practical development of a family of high-order bandpass filtering dispersive-delay structures (DDSs) with radiofrequency (RF)-input-quasi-absorptive capabilities are presented. They consist of RF complementary-diplexer-based circuits, in which the main channel is a reflective-type bandpass filtering DDS and the resistively terminated auxiliary channel exhibits a bandstop filtering response with a quasi-complementary frequency profile with regard to that of the main channel. In this manner, the out-of-band/non-transmitted RF-input-signal power echoed by the main channel is mostly dissipated by the loading resistor of the auxiliary channel. As a fundamental constituent circuit block arranged in in-series-cascaded configurations for high-order reflective-type bandpass filtering DDS realizations, a triplet coupled-resonator network with one frequency-dependent coupling (FDC) is used. Its transmission properties are nearly transferred to the total RF-input-quasi-absorptive bandpass filtering DDS, which preserves the patterned group-delay/phase-variation response of the main channel. The theoretical design method of the devised RF-input-quasi-reflectionless bandpass filtering DDSs is detailed and exemplified with fifth- and seventh-order synthesis examples. It is based on a two-step design process, as follows: 1) separate polynomial/coupling-matrix synthesis of the main and auxiliary channels for the desired bandpass filtering DDS specifications in transmission and the complementary bandstop filtering functionality, respectively, and 2) coupling-matrix optimization of the overall RF-input-quasi-absorptive bandpass filtering DDS. Furthermore, for experimental demonstration purposes, a 2-GHz microstrip prototype of the previously designed RF-input-quasi-reflectionless fifth-order filtering DDS that features a stepped-type group-delay response is manufactured and characterized.
期刊介绍:
The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design.