Radio apparatus and method having a d.c. component signal superposed on a transmission signal
AssigneeNEC Corporation
InventorYUJI YAJIMA
Life of this patent
Estimating the term…
Abstract
In a radio apparatus including a transmitter unit and an antenna unit, a detector is located in the vicinity of an antenna in the antenna unit rather than in the transmitter unit. The detector supplies a rectified signal from a transmission wave which is to be radiated from the antenna and the rectified signal is supplied to a control circuit in the transmission unit as a feedback component. A control signal is then determined by the control circuit based on the rectified signal and supplied to a variable attenuator to increase/decrease power of the transmission wave.
Claims17
A radio apparatus including an antenna unit which radiates a transmission signal and a transmitter unit which supplies the transmission signal to the antenna unit through a line between the transmitter unit and the antenna unit,
- the antenna unit comprising:
- a coupler which partially extracts the transmission signal to produce an extracted signal;
- and
- a rectifying circuit which rectifies the extracted signal into a d.c. component signal and superposes the d.c. component signal on the transmission signal;
- the transmission unit comprising:
- a separating circuit which separates the d.c. component signal from the transmission signal.
A method of controlling a radio apparatus including an antenna unit which radiates a transmission signal and a transmitter unit which supplies the transmission signal, the antenna unit and the transmitter unit being connected electrically from each other, the method comprising the steps of:
- partially extracting, at the antenna unit, the transmission signal;
- rectifying, at the antenna unit, the extracted signal into a d.c. component signal;
- superposing, at the antenna unit, the d.c. component signal on the transmission signal;
- and
- separating, at the transmitter unit, the d.c. component signal from the transmission signal.
A method of controlling an antenna unit remote from a transmitter unit, the antenna unit which radiates the transmission signal and the transmitter unit which supplies the transmission signal being included in a radio apparatus and connected electrically from each other, the method comprising the steps of:
- partially extracting the transmission signal;
- rectifying the extracted signal into a d.c. component signal;
- and
- superposing the d.c. component signal on the transmission signal.
A method of controlling a transmitter unit, the transmitter it which supplies a transmission signal and an antenna unit which radiates the transmission signal being included in a radio apparatus and connected electrically from each other, the method comprising the step of:
- receiving a d.c. component signal via the transmission signal from the antenna unit;
- and
- separating the d.c. component signal from the transmission signal.
Dependencies are inferred from the claim text.