Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2005-05-24
2005-05-24
Chin, Vivian (Department: 2682)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S575100, C455S550100, C455S552100, C455S562100, C455S025000, C455S101000
Reexamination Certificate
active
06898449
ABSTRACT:
A conventional mobile communications device typically employs a non-directional antenna so that the antenna offers a satisfactory gain irrespective of how the device is used, resulting in much radiation of electromagnetic waves from the antenna toward the human body. Using a directional antenna instead of a non-directional antenna reduces the radiation of electromagnetic waves from the antenna toward the human body, but lowers the antenna gain in a stand-by state and thus increases the risk of failing to receive an incoming call. According to the invention, a mobile communications device has a non-directional antenna, a directional antenna, a transmitter/receiver section, a switch for switching states of connection between the non-directional and directional antennas and the transmitter/receiver section, and a control circuit for controlling the switch. This reduces the radiation of electromagnetic waves from the antenna toward the human body but nevertheless ensures a satisfactory antenna gain even in a stand-by state.
REFERENCES:
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Birch & Stewart Kolasch & Birch, LLP
Chin Vivian
Sharp Kabushiki Kaisha
Tran Tuan
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