High-frequency switch

摘要

A high-frequency composite part, comprises a multilayer board formed by laminating a plurality of dielectric layers (a-m); a high-frequency switch (SW) for switching between the connection of a transmitting circuit (Tx) and an antenna (ANT) and the connection of a receiving circuit (Rx) and the antenna (ANT); and an amplifier (AMP1) at the side of the transmission circuit (Tx) for amplifying a transmission signal and sending it to the high-frequency switch (SW). A transmission line (STL2) at the side of the receiving circuit (Rx) of the high-frequency switch (SW) and a transmission line (STL3, STL4) of the amplifier (AMP1) are built in the multilayer board at different portions in plain view in order to avoid an undesired high-frequency-coupling of transmission signals to the receiving circuit. <IMAGE>