RADIO FREQUENCY SWITCH MODULE FOR MULTI-BAND, CONNECTING COMMON ANTENNA TO TRANSMITTING CIRCUIT OR RECEIVING CIRCUIT AMONG TRANSMITTING AND RECEIVING SYSTEMS DIFFERENT IN PASS BAND

摘要

PURPOSE: A radio frequency switch module for multi-band is provided to reduce the size of a dual-band cellular phone by realizing a small chip in a laminated structure. CONSTITUTION: A band separation circuit(2) is formed of filter circuits each having an LC circuit, with one end connected with a common antenna. Switching circuits switch transmission circuits and receiving circuits of transmission and receiving systems, each including switching elements and transmission lines. A laminated body includes a plurality of dielectric layers, pattern electrodes printed on the dielectric layers, a terminal electrode formed on a surface of the laminated body, and a chip element packed on a top side of the laminated body. A transmission system has a low pass filtering function provided by low pass filter circuits. The low pass filter circuit includes pattern electrodes printed on the dielectric layers. The pattern electrodes of the band separation circuit(2) and the pattern electrodes of the low pass filter circuit are individually formed in a horizontal direction of the laminated body.