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Methode und Vorrichtung zur adaptiven Entkopplung von Ueberkopplungen bei Mehrfachantennen

IP.com Disclosure Number: IPCOM000028144D
Published in the IP.com Journal: Volume 4 Issue 5 (2004-05-25)
Included in the Prior Art Database: 2004-May-25
Document File: 1 page(s) / 22K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Due to the increasing importance of wireless communication future communication devices will have to support many different standards and systems, for example WLAN (Wireless Local Area Network), UMTS (Universal Mobile Telecommunications System), GSM and others. Therefore, also the number of antennas and their placement density is going to increase. This causes problems because the impedance matching of neighboring antennas strongly influences their radiation efficiency and impedance bandwidth. This effect increases proportionally with decreasing distance. Up to now no solution is known. It is herby proposed to decouple unused antennas in a multi-antenna transceiver by using a switchable impedance matching network. Decoupling of unused antennas minimizes the performance loss of the active antenna. The antennas can be turned active or inactive individually by switching to an impedance block instead of the transmitter or vice versa. Such an arrangement can be seen in figure 1.

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Methode und Vorrichtung zur adaptiven Entkopplung von Ueberkopplungen bei Mehrfachantennen

Idea: Dr. Reinhold Braam, DE-Bocholt; Carlos Civeira Muñoz, DE-Bocholt

Due to the increasing importance of wireless communication future communication devices will have to support many different standards and systems, for example WLAN (Wireless Local Area Network), UMTS (Universal Mobile Telecommunications System), GSM and others. Therefore, also the number of antennas and their placement density is going to increase. This causes problems because the impedance matching of neighboring antennas strongly influences their radiation efficiency and impedance bandwidth. This effect increases proportionally with decreasing distance. Up to now no solution is known.

It is herby proposed to decouple unused antennas in a multi-antenna transceiver by using a switchable impedance matching network. Decoupling of unused antennas minimizes the performance loss of the active antenna. The antennas can be turned active or inactive individually by switching to an impedance block instead of the transmitter or vice versa. Such an arrangement can be seen in figure 1.

The adjustment of the impedance level can be made by predefined values based on the actual and individual design and the selected frequency range. Alternatively an adaptable adjustment of the antenna decoupling can be realized by measuring the coupled electromagnetic power into the inactive antennas and then adjusting the impedance...