Abstract: A first signal path has one or a plurality of coils arranged in series, the coils being connected to the output of a first amplifier. A second signal path has the same number of coils as the coils of the first signal path, the coils being arranged in series and connected to the output of a second amplifier. Coupling paths have capacitors and couple the first signal path and the second signal path at both ends of the corresponding coils on the first signal path and the second signal path. A SW controlling unit switches a switch to a contact when a signal is input from the first amplifier and switches the switch to a contact when a signal is input from the second amplifier.

Abstract: An antenna receives an RF signal and an RF signal at different frequency bands. An oscillator outputs a local oscillator signal at a frequency f1. An oscillator outputs a local oscillator signal at a frequency f2. A modulator modulates the frequency based on the local oscillator signal at the frequency f1 and the local oscillator signal at the frequency f2, and generates a plurality of local oscillator signals at different frequencies. A frequency converter mixes the plurality of local oscillator signals, at different frequencies, generated by the modulator, with the RF signal and the RF signal, and generates baseband signals of the RF signal and the RF signal. A signal processor performs a predetermined process for the baseband signals generated by the frequency converter.

Abstract: A first signal path has one or a plurality of coils arranged in series, the coils being connected to the output of a first amplifier. A second signal path has the same number of coils as the coils of the first signal path, the coils being arranged in series and connected to the output of a second amplifier. Coupling paths have capacitors and couple the first signal path and the second signal path at both ends of the corresponding coils on the first signal path and the second signal path. A SW controlling unit switches a switch to a contact when a signal is input from the first amplifier and switches the switch to a contact when a signal is input from the second amplifier.

Abstract: A first casing and a second casing movably connected to the first casing are provided. PAs amplify a transmit signal. FET switches are provided between the ground and respective transmission paths connecting the PAs and an antenna. When an intermediate voltage is applied, the FET switch has a capacitance according to the applied intermediate voltage. An open or close detection unit acquires the impedance of the antenna corresponding to the positional relationship of the first casing and the second casing. A control unit turns one of a plurality of switches ON and applies the intermediate voltage to the FET switches to achieve a capacitance whereby the impedance of the PA arranged on the transmission path where the switch is ON and the impedance of the antenna are matched based on the impedance of the antenna acquired by the open or close detection unit.

Abstract: A first casing and a second casing movably connected to the first casing are provided. PAs amplify a transmit signal. FET switches are provided between the ground and respective transmission paths connecting the PAs and an antenna. When an intermediate voltage is applied, the FET switch has a capacitance according to the applied intermediate voltage. An open or close detection unit acquires the impedance of the antenna corresponding to the positional relationship of the first casing and the second casing. A control unit turns one of a plurality of switches ON and applies the intermediate voltage to the FET switches to achieve a capacitance whereby the impedance of the PA arranged on the transmission path where the switch is ON and the impedance of the antenna are matched based on the impedance of the antenna acquired by the open or close detection unit.

Abstract: A wireless communication device including an amplifying unit amplifying a transmission signal, a transmission unit configured to transmit the transmission signal amplified through the amplifying unit, a regulating unit configured to regulate a load of the amplifying unit, and a control unit configured to control the regulating unit so that the regulating unit regulates the load of the amplifying unit to attain a load impedance determined based on, a) a power ratio of the transmitted transmission signal to a reflected signal reflected from the transmission unit, and b) at least one of a value of a current passing through the amplifying unit and a gain of the amplifying unit.