| 摘要 |
PROBLEM TO BE SOLVED: To raise isolation between a low-frequency communication system and a high-frequency communication system. SOLUTION: A high-frequency switching module includes: a branching filter circuit having a low-pass filter and a high-pass filter; a first switching circuit to be connected to the low-pass filter; a second switching circuit to be connected to the high-pass filter; and a low-pass filter arranged in a transmission route. The transmission line of the switching circuit which is mainly constituted of: the branching filter circuit; the LC circuit of the low-pass filter; a diode; and the transmission line, is formed in a dielectric layered body through the use of an electrode pattern. The electrode pattern constituting the LC circuit is connected to the electrode pattern constituting the transmission line via a via-hole over a plurality of dielectric body layers. The high-frequency switching module further includes ground electrodes G11, G12, G13 between via-hole electrodes Hi, Ho which connect the electrode pattern of the capacitors C2, C3, C4 constituting the high-pass filter of the branch filter to the electrode pattern of a quarter-wave transmission line at the reception route side of thee first switching circuit. COPYRIGHT: (C)2005,JPO&NCIPI
|
