Low-Pass and Bandpass Filters With Ultra-Broad Stopband Bandwidth Based on Directional Couplers

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Título: Low-Pass and Bandpass Filters With Ultra-Broad Stopband Bandwidth Based on Directional Couplers
Autor/es: Gómez-García, Roberto | Sánchez-Soriano, Miguel Ángel | Sánchez-Renedo, Manuel | Torregrosa-Penalva, Germán | Bronchalo, Enrique
Grupo/s de investigación o GITE: Grupo de Microondas y Electromagnetismo Computacional Aplicado (GMECA)
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal
Palabras clave: Bandpass filter (BPF) | Bandstop filter (BSF) | Branch-line hybrid | Directional coupler | Hybrid ring | Low-pass filter (LPF) | Microstrip filter | Signal interference | Transmission zero (TZ) | Transversal filtering section (TFS) | Wideband filter
Área/s de conocimiento: Teoría de la Señal y Comunicaciones
Fecha de publicación: dic-2013
Editor: IEEE
Cita bibliográfica: IEEE Transactions on Microwave Theory and Techniques. 2013, 61(12): 4365-4375. doi:10.1109/TMTT.2013.2281965
Resumen: The design of planar sharp-rejection low-pass and bandpass filters (LPFs and BPFs) featuring a very broad stopband is addressed in this paper. For the LPF case, two new classes of bandstop signal-interference transversal filtering section (TFS) consisting of power directional couplers in reflection mode are proposed. In the BPF application, additional short-circuit stubs are inserted at the TFS input/output accesses. Based on these filtering cells, the devised LPF and BPF approaches are then derived from the cascade of multiple TFSs with frequency-contiguous stopbands. Thus, an overall attenuated band showing an ultra-large spectral width and deep rejection levels through the generation of several transmission zeros (TZs) is synthesized. Furthermore, such unprecedented filtering performances are obtained for much lower circuit complexity than available solutions. The operating principle of the conceived LPF and BPF topologies and guidelines for their realization are detailed. This includes formulas for their analytically designable TZs. For practical validation, three LPF prototypes and one wideband BPF circuit are also fabricated in microstrip technology and tested.
Patrocinador/es: This work was supported by the Spanish National Board of Scientific and Technological Research under Project TEC2010-21520-C04-02 and Project TEC2010-21520-C04-04.
URI: http://hdl.handle.net/10045/53914
ISSN: 0018-9480 (Print) | 1557-9670 (Online)
DOI: 10.1109/TMTT.2013.2281965
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2013 IEEE
Revisión científica: si
Versión del editor: http://dx.doi.org/10.1109/TMTT.2013.2281965
Aparece en las colecciones:INV - GMECA - Artículos de Revistas

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