Ultrabroadband 8 × 8 Butler matrix designed with the use of multisection directional couplers and phase correction networks

Autor: Slawomir Gruszczynski, K. Sachse, S. Kuta, Krzysztof Wincza
Rok vydání: 2012
Předmět:
Zdroj: Microwave and Optical Technology Letters. 54:1375-1380
ISSN: 0895-2477
DOI: 10.1002/mop.26805
Popis: An innovative approach that allows for realization of ultrabroadband 8 × 8 Butler matrices has been proposed. It is shown that such a matrix can be divided into two pairs of identical 4 × 4 submatrices, which appropriately connected constitute an ultrabroadband 8 × 8 Butler matrix. To achieve broadband operation in terms of amplitude multisection symmetrical coupled-line directional couplers are used. Moreover, it has been shown that all the required broadband phase shifters can be realized with the use of tandem connections of two 3-dB/90° directional couplers in conjunction with Schiffman C-sections. To achieve that, four intentionally selected crossovers have been realized as tandem connections of two 3-dB/90° coupled-line directional couplers and appropriate Schiffman C-sections have been added to the outer channels within each 4 × 4 submatrix. The proposed concept has been used for the design of an 8 × 8 Butler matrix operating in the frequency range 1.8–12 GHz and the measurements of the manufactured network are shown. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1375–1380, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26805
Databáze: OpenAIRE