| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent an interfering wave having a frequency f (f>0) corresponding to a difference between a center frequency f<SB POS="POST">R</SB>of a passband of a receiving filter and a center frequency f<SB POS="POST">T</SB>of a passband of a transmitting filter from entering the receiving filter, while reducing an insertion loss in the passband of the receiving filter. <P>SOLUTION: An auxiliary inductor element 25 is disposed between a ground and a junction between a first series arm 21 and a second series arm 21 disposed in series between an antenna port 1 and a reception port 3. A capacitance value of the first series arm 21, a capacitance value of the second series arm 21 and an inductance value of the auxiliary inductor element 25 are each set such that a configuration comprising the first series arm 21, the second series arm 21 and the auxiliary inductor element 25 becomes a high pass filter having an attenuation range located at the frequency f. <P>COPYRIGHT: (C)2013,JPO&INPIT |
