Radio communication device

Details Radio communication device Radio communication device

1999-02-10

2001-02-27

Le, Hoanganh (Department: 2821)

Communications: radio wave antennas

Antennas

With radio cabinet

C343S906000, C455S090300

Reexamination Certificate

active

06195052

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to radio communication devices. In particular, this invention relates to, but is not necessarily limited to, a radio communication device using an antenna for transmitting or receiving radio frequency (RF) signals.
BACKGROUND OF THE INVENTION
Radio communication devices are known to operate with antennae for transmitting or receiving radio frequency (RF) signals within a communication environment. Typically, these antennae are designed to transmit or receive the signals found within desired bandwidths of RF frequencies. As a result, signals not found within the desired bandwidths are not transmitted or received as efficiently.
As is known in the art of antenna design, impedance mismatch between an antenna and circuitry of a radio communication device causes a loss in the power of a signal being transmitted or received. For a transmitted signal, reflection of such a signal back to the circuitry typically accounts for some of the loss. Generally, reflected power of a transmitted signal does not cause any problems when its magnitude is small relative to the magnitude of what is transmitted. However, when the impendance mismatch exceeds a tolerable limit, the reflected power may damage sensitive components of the circuitry.
For radio communication devices with detachable antennae, mismatch conditions due to improper antenna connection or absence of a required antenna can also cause problems of reflected power. Typically, the absence of an antenna results in an open circuit mismatch condition where a transmitted signal is totally reflected. Consequently, this open circuit mismatch condition can seriously damage sensitive components. In the absence of feedback to users, these mismatch conditions may cause the user to perceive incorrectly that a radio communication device is faulty.
SUMMARY OF THE INVENTION
It is an object of this invention to overcome or at least alleviate at least one of the problems associated with radio communication devices using antennae.
According to one aspect of the invention, there is provided a radio communication device, said device comprising:
a controller; and
an antenna mount having a plurality of electrical contacts, at least one of said electrical contacts being coupled to said controller and at least one other of said electrical contacts being coupled to a reference voltage.
According to another aspect of the invention, there is provided an antenna for a radio communication device, said antenna comprising:
at least one conductive track, said conductive track being for connecting at least some of a plurality of electrical contacts of said device.


REFERENCES:
patent: 5852421 (1998-12-01), Maldonado
patent: 5861854 (1999-01-01), Kawahata et al.
patent: 5969685 (1999-10-01), Hayes et al.
patent: 5986607 (1999-11-01), Rudisill
patent: 6028568 (2000-02-01), Asakura et al.

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