Input-Reflectionless Quasi-Elliptic-Type Single- and Dual-Band Bandpass Filters Based on Passive Channelized Principles
An approach to design quasi-elliptic-type planar filters with single-and dual-band bandpass transfer functions and input-absorptive capabilities is presented. Two-branch channelized passive circuit configurations are exploited for this purpose, in which the low-order reflective-type filtering profil...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universidad de Alcalá (UAH) |
| Repositorio: | e_Buah Biblioteca Digital Universidad de Alcalá |
| Idioma: | inglés |
| OAI Identifier: | oai:ebuah.uah.es:10017/67129 |
| Acceso en línea: | http://hdl.handle.net/10017/67129 https://dx.doi.org/10.1109/TCSI.2022.3207880 |
| Access Level: | acceso abierto |
| Palabra clave: | Absorptive filter Bandpass filter Channelized filter, dual-band filter Lossy filter Microstrip filter Multi-band filter Planar filter Quasi-elliptic-type filter Reflectionless filter Signal-interference filter Transmission zero Transversal filter Electrónica Electronics |
| Sumario: | An approach to design quasi-elliptic-type planar filters with single-and dual-band bandpass transfer functions and input-absorptive capabilities is presented. Two-branch channelized passive circuit configurations are exploited for this purpose, in which the low-order reflective-type filtering profile of their branches is converted into the desired sharp-rejection input-reflectionless filtering action in the overall circuit. This is achieved by means of fully-destructive and frequency-selective transversal signal-interference effects at the total input and output accesses of the channelized filter, respectively. The theoretical operational principles of the proposed concept of single/dual-passband input-reflectionless two-branch channelized filter are detailed, along with design considerations for their RF transmission-line-based implementation. Besides, its generalization to N-channel architectures is also analyzed. Furthermore, as the fundamental elements of the devised channelized filtering philosophy to increase selectivity, alternative solutions to realize their output phase-delay sections for a more-flexible control of the transmission zeros in the overall transfer function are discussed. For experimental-demonstration purposes, two microstrip proof-of-concept prototypes are developed and measured. They consist of 3-GHz single-band and 2.58/3.43-GHz dual-band designs with input-quasi-reflectionless spectral ratio above 2.5:1 and 3:1, respectively. |
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