Frequency-transformation-based co-designed lowpass-single/multi-passband-highpass RF filters
The theoretical design and practical development of RF analog filtering devices with co-integrated lowpass, single/multi-band bandpass, and highpass transfer functions is reported. For this purpose, two different classes of generalized frequency transformation that convert the equivalent normalized...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universidad de Alcalá (UAH) |
| Repositorio: | e_Buah Biblioteca Digital Universidad de Alcalá |
| Idioma: | inglés |
| OAI Identifier: | oai:ebuah.uah.es:10017/65202 |
| Acceso en línea: | http://hdl.handle.net/10017/65202 https://dx.doi.org/10.1109/TCSI.2024.3382094 |
| Access Level: | acceso abierto |
| Palabra clave: | Analog filter Absorptive filter Bandpass filter Co-designed circuit Filtering power divider Frequency transformation Highpass filter Lowpass filter Lumped-element filter Microstrip filter Microwave filter Multi-functional circuit Planar filter Reflectionless filter RF filter transmission zero (TZ) Telecomunicaciones Telecommunication |
| Sumario: | The theoretical design and practical development of RF analog filtering devices with co-integrated lowpass, single/multi-band bandpass, and highpass transfer functions is reported. For this purpose, two different classes of generalized frequency transformation that convert the equivalent normalized lowpass filter prototype into the desired RF filter with several co-designed filtering actions are proposed. They realize a frequency mapping of the reactance of a normalized unitary capacitor into that of a one-port single/multi-resonance cell with added lowpass and highpass filtering capabilities. For these devised frequency transformations, the theoretical foundations and various illustrative filter examples designed at the ideal-circuit-model level are presented. In addition, higher-selectivity filter architectures based on the generation of additional out-of-band transmission zeros (TZs) by means of cross-coupling techniques are shown. Afterwards, the extension of this design methodology to RF multi-functional filtering components, such as input-reflectionless /absorptive filters based on complementary-diplexer circuit networks and two-way filtering power-distribution circuits, is also demonstrated. Furthermore, two design examples of distributed-element and inverterless lumped-element RF filters are provided. Besides, for the distributed-element circuit, a proof-of-concept microstrip prototype is manufactured and measured as experimental validation. |
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