Decoupling and Matching Network for Miniaturised 3-Port Antenna Arrays Based on 180 degree Couplers

Conference: INICA 2007 - International ITG-Conference on Antennas
03/28/2007 - 03/30/2007 at Munich, Germany

Proceedings: INICA 2007

Pages: 4Language: englishTyp: PDF

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Volmer, Christian; Weber, Jörn; Stephan, Ralf; Blau, Kurt; Hein, Matthias A. (Technische Universität Ilmenau, Institute for Information Technology, PO Box 100565, 98684 Ilmenau, Germany)

In ordinary antenna arrays the spacing between radiators is usually chosen λ/2. In order to use antenna arrays in small mobile platforms, the overall dimensions and hence the radiator separation must be reduced, which aggravates the problem of mutual coupling between radiators. Results are highly distorted beam patterns and greatly reduced radiation efficiency. We propose a simple method to design a decoupling and matching network for a three element antenna array with a radiator separation of λ/4, which excites the orthogonal eigenmodes of radiation of the antenna array.