Low-Pass and Bandpass Filters With Ultra-Broad Stopband Bandwidth Based on Directional Couplers
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Title: | Low-Pass and Bandpass Filters With Ultra-Broad Stopband Bandwidth Based on Directional Couplers |
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Authors: | Gómez-García, Roberto | Sánchez-Soriano, Miguel Ángel | Sánchez-Renedo, Manuel | Torregrosa-Penalva, Germán | Bronchalo, Enrique |
Research Group/s: | Grupo de Microondas y Electromagnetismo Computacional Aplicado (GMECA) |
Center, Department or Service: | Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal |
Keywords: | 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 |
Knowledge Area: | Teoría de la Señal y Comunicaciones |
Issue Date: | Dec-2013 |
Publisher: | IEEE |
Citation: | IEEE Transactions on Microwave Theory and Techniques. 2013, 61(12): 4365-4375. doi:10.1109/TMTT.2013.2281965 |
Abstract: | 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. |
Sponsor: | 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 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2013 IEEE |
Peer Review: | si |
Publisher version: | http://dx.doi.org/10.1109/TMTT.2013.2281965 |
Appears in Collections: | INV - GMECA - Artículos de Revistas |
Files in This Item:
File | Description | Size | Format | |
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2013_Gomez_etal_IEEE-TMTT_final.pdf | Versión final (acceso restringido) | 1,84 MB | Adobe PDF | Open Request a copy |
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