Patent ID: 7383023

Claim:
A communication apparatus which communicates a signal, comprising: a transmission object signal level changing unit which changes a level of a signal which becomes, as to each of plural channels, a transmission object of each channel; a transmission filter unit which carries out filtering for a signal of each channel, of which a level was changed by the transmission object signal level changing unit, by a filtering characteristic for allowing passage of a frequency component of each channel, as to each of the plural channels; a transmission signal coupling unit which couples signals of the plural channels, for which filtering was carried out by the transmission filter unit; an antenna which transmits a signal which was coupled by the transmission signal coupling unit, by wireless; a coupled signal dividing unit which divides a part of the coupled signal which is outputted from the transmission signal coupling unit to the antenna, into a plurality of signals; a level detection filter unit which carries out filtering each divided signal which was divided up by the coupled signal dividing unit, by a filtering characteristic which is tuned to an identical frequency to that of the filtering characteristic of the transmission filter unit, as to each of the plural channels; a signal level detecting unit which detects a level of a signal of each channel, which was obtained by filtering due to the level detection filter unit; and a transmission object signal level change mode controlling unit which controls a mode of changing a level of a signal which becomes a transmission object of each channel, by the transmission object signal level changing unit, on the basis of a level of a signal of each channel, which was detected by the signal level detecting unit.