Patent ID: 6832097
Filing Date: 2004-12-14
Classification: H04B,H04W

Abstract:
A radio communication apparatus for varying a transmission power in accordance with a reception power in a range not exceeding a predetermined maximum transmission power, comprising:a variable amplifier configured to amplify a transmit signal, the gain of the variable amplifier being variable upon amplification; a first antenna; an antenna switching unit detachable to a second antenna and configured to select one of the first and second antennas if the second antenna is attached to the apparatus; and a transmission power controller configured to control the gain of the variable amplifier such that if the antenna switching unit selects the first antenna and a standard gain determined in accordance with the reception power does not exceed a first predetermined limit value determined by the maximum transmission power and power loss at the first antenna, the gain of the variable amplifier is set to the standard gain; if the antenna switching unit selects the first antenna and the reference gain exceeds the first limit value, the gain of the variable amplifier is set to the first limit value; if the antenna switching circuit selects the second antenna and the standard gain does not exceed a second predetermined limit value determined by correcting the first control value based on a difference between a power loss at the first antenna and a power loss at the second antenna, the gain of the variable amplifier is set to the standard gain; and if the antenna switching unit selects the second antenna and the standard gain exceeds the second limit value, the gain of the variable amplifier is set to the second limit value.