Wireless terminal position detecting device and method

Details Wireless terminal position detecting device and method Wireless terminal position detecting device and method

2007-06-12

2007-06-12

Chen, Shih-Chao (Department: 2821)

Communications: radio wave antennas

Antennas

With vehicle

C307S010100, C340S005610

Reexamination Certificate

active

10919882

ABSTRACT:
A wireless terminal position detecting device for a portable device includes a plural n-number of transmission antennas disposed such that a portion of their reachable areas overlap, a signal dividing device for dividing a request signal into the plural n-number of divided parts, and a signal distributing device for causing the divided parts of the request signal to be transmitted sequentially from these transmission antennas. The position of the portable device is detected based on an answer signal returned from the portable device in response to the request signal.

REFERENCES:
patent: 6208239 (2001-03-01), Muller et al.
patent: 6552649 (2003-04-01), Okada et al.
patent: 6700476 (2004-03-01), Okada et al.
patent: 6778065 (2004-08-01), Asakura et al.
patent: 2003/0058086 (2003-03-01), Hara
patent: 2004/0046451 (2004-03-01), Shibagaki et al.
patent: 2004/0061660 (2004-04-01), Yoshida et al.
patent: 2004/0085189 (2004-05-01), Nagai et al.
European patent application No. 04 020 149.3-2220, Examination Report dated Sep. 26, 2005.

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