Multiband multimode compact antenna system

Details Multiband multimode compact antenna system Multiband multimode compact antenna system

2007-11-20

2007-11-20

Phan, Tho (Department: 2821)

Communications: radio wave antennas

Antennas

With radio cabinet

C343S7000MS, C343S741000

Reexamination Certificate

active

11476470

ABSTRACT:
An antenna system for use in a communications device, such as a mobile phone. The antenna system has a multiband GSM antenna operating at GSM850, GSM900, GSM 1800 and GSM 1900 that has a short-circuited section located between a separate UMTS antenna and a UMTS receive diversity antenna. As such, large electrical isolation between the two UMTS antennas can be achieved. The UMTS antennas can be short-circuited microstrip loop antennas, IFA, PIFA, ILA or PILA antennas. These antennas are well-isolated antennas instead of coupled antennas. As such, the diversity antenna is well isolated from the main antenna despite its close proximity to the main antenna. Well-isolated antennas have little mutual coupling and, therefore, are easier to design than coupled antennas, because isolated antennas can be tuned independently from each other.

REFERENCES:
patent: 6597317 (2003-07-01), Talvitie
patent: 2005/0057406 (2005-03-01), Ohara et al.
patent: 2005/0190108 (2005-09-01), Lin et al.
patent: 2005/0270238 (2005-12-01), Jo et al.
patent: 2006/0170600 (2006-08-01), Korva
patent: 2007/0008222 (2007-01-01), Wang et al.
patent: 2007/0109201 (2007-05-01), Licul et al.

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