H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/47
H04B 1/04 (2006.01) H04B 1/40 (2006.01)
Patent
CA 2003831
ABSTRACT The invention provides a radio communication apparatus, which includes means for preventing unwanted and unnecessary radiation at the start of a radio transmission. The apparatus of the present invention has a simple delay circuit for slowly increasing the voltage applied to an amplifier in a transmission unit including an oscillator, which generates a high-frequency signal of a desired carrier, a buffer, and the amplifier to which is input the high-frequency signal from the oscillator via the buffer and which amplifies the signal and transmits data via an antenna. The delay circuit is connected to a voltage line applied to the amplifier and slowly increases the voltage at the start of the radio wave transmission. The input impedance of the amplifier is prevented from sharply changing and is only allowed to change slowly. The change of the input impedance of the amplifier is translated into a change of load impedance of the oscillator, the amount of such impedance change being decreased by the operation of the buffer. Thus, it is possible to prevent the generation of unnecessary radiation at the start of the radio wave transmission.
Borden Ladner Gervais Llp
Yonei Yoshiyuki
LandOfFree
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