Design of a Multimode MIMO Antenna Using Characteristic Modes

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 5Language: englishTyp: PDF

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Antonino-Daviu, E.; Cabedo-Fabres, M.; Ferrando-Bataller, M. (Instituto de Telecomunicaciones y Aplicaciones Multimedia (iTEAM), Universidad Polit├ęcnica de Valencia, Edificio 8G, Camino de Vera, s/n 46022 Valencia, Spain)
Gallo, M.; Bozzetti, M. (Politecnico di Bari, via Orabona 4, 70125 Bari, Italy)

In this communication, the design procedure of a multimode Multiple-Input Multiple-Output (MIMO) antenna is presented. The antenna consists of a metallic ring antenna operating with different orthogonal modes, whose performance in a MIMO system is similar to traditional antenna arrays. Thus, a compact MIMO antenna is obtained, which is very suitable for mobile terminals. A modal analysis of the antenna is carried out first by means of the Theory of Characteristic Modes, in order to identify the different radiating modes of the antenna. Then a set of feeding configurations is proposed so as to excite these modes. As the modes must operate in the same frequency band, a loading technique is used in the antenna in order to shift the resonance frequency of the modes to the proper band.