| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide multi-mode communication equipment which has devices such as a low-noise amplifier (LNA) of a reception circuit prevented from being broken down by leaking power and is capable of obtaining a satisfactory reception sensitivity. <P>SOLUTION: The multi-mode communication equipment provided with a first transmission circuit 11 and a first reception circuit 12 corresponding to a first mobile communication system and a second transmission circuit 13 and a second reception circuit 14 corresponding to a second mobile communication system independently of each other includes cut off frequency variable filters 18 and 17 for suppressing leakage of transmission output power of the transmission circuits 11 and 13 to the reception circuits 14 and 12 of each other, a cut off frequency storage part 22 for storing cut off frequencies of the cut off frequency variable filters 18 and 17 corresponding to the transmission output powers of the transmission circuits 11 and 13, and a cut off frequency control part 23 for changing and controlling cut off frequencies of the cut off frequency variable filters 18 and 17 in accordance with transmission output powers. The cut off frequencies are adjusted to such degrees that the amount of attenuation in a frequency band for use can be secured at least. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
