Radio communication terminal

摘要

A mobile communication terminal (100) has a switch (140A) that switches to either a path (T2) that supplies a transmission signal from a modulator-demodulator circuit (200) to a transmitting and receiving antenna (101) via a transmission filter (110A) and via a notch filter (120A) or a path (T1) that supplies the transmission signal to transmitting and receiving antenna (101) via the transmission filter (110A) and a switch (140B) that switches to either a path (R2) that supplies a reception signal from transmitting and receiving antenna (101) to the modulator-demodulator circuit (200) via a reception filter (110B) and a notch filter (120B) or a path (R1) that supplies the reception signal to the modulator-demodulator circuit (200) via the reception filter (110B).

主权项

1. A radio communication terminal, comprising:
a modulation unit for generating a first upward link modulated transmission signal transmitted by a first upward link frequency belonging to a first upward link frequency band used for an upward link communication in a first radio communication network, and for generating a second upward link modulated transmission signal transmitted by a second upward link frequency belonging to a second upward link frequency band used for an upward link communication in a second radio communication network, the second upward link frequency band including an entirety of the first upward link frequency band and an upward link non-overlapping frequency band differing from the first upward link frequency band; a transmitter antenna that transmits the first upward link modulated transmission signal and the second upward link modulated transmission signal; a transmission bandpass filter that passes a frequency component belonging to the second upward link frequency band; a transmission bandstop filter that attenuates a frequency component belonging to the upward link non-overlapping frequency band of the second upward link frequency band; a transmission switch that changes a path between the modulation unit and the transmitter antenna so that the first upward link modulated transmission signal is supplied to the transmitter antenna via the transmission bandpass filter and the transmission bandstop filter during communication with the first radio communication network and so that the second upward link modulated transmission signal is supplied to the transmitter antenna via the transmission bandpass filter during communication with the second radio communication network; a receiver antenna that receives a first forward link modulated reception signal modulated with a first forward link frequency belonging to a first forward link frequency band used for forward link communication in the first radio communication network and a second forward link modulated reception signal modulated with a second forward link frequency belonging to a second forward link frequency band used for forward link communication in the second radio communication network, the second forward link frequency band including a part of the first forward link frequency band and a forward link nor-overlapping frequency band differing from the first forward link frequency band; a demodulation unit for generating a first reception signal by demodulating the first forward link modulated reception signal and for generating a second reception signal by demodulating the second forward link modulated reception signal; a reception bandpass filter that passes a frequency component belonging to the first forward link frequency band and a frequency component belonging to the second forward link frequency band; a reception bandstop filter that attenuates a frequency component belonging to the first forward link frequency band and not belonging to the second forward link frequency band; and a reception switch that changes a path between the receiver antenna and the demodulation unit so that the first forward link modulated reception signal is supplied to the demodulation unit via the reception bandpass filter during communication with the first radio communication network and so that the second forward link modulated reception signal is supplied to the demodulation unit via the reception bandpass filter and the reception bandstop filter during communication with the second radio communication network.