Front end module

Abstract

A front end module (2) comprises: a triplexer (11) for separating the AMPS band, the PCS band and the GPS band from one another; a duplexer (12) for separating transmission signals and reception signals in the AMPS band from each other; and a duplexer (13) for separating transmission signals and reception signals in the PCS band from each other. The duplexers (12, 13) each include an acoustic wave element that functions as a filter. A single multilayer substrate is used to integrate the triplexer (11) and the duplexers (12, 13). The triplexer (11) is made up of conductor layers located inside or on the surface of the multilayer substrate.

Description

technical field [0001] The present invention relates to a front-end module for processing transmission signals and reception signals in communication devices such as cellular phones. Background technique [0002] In recent years, mobile phones (cellular phones) have entered the third generation, and it is becoming necessary not only to have a simple call function, but also to have a high-speed data communication function that can transmit e-mail and image data. In addition, a position detection function is also required. [0003] For example, in the United States, there is a law obliging cellular phones to have a location detection function. In the United States, for example, there are two frequency bands of about 800MHz to 900MHz frequency band used in AMPS (Advanced Mobile Phone System) and about 1800MHz to 2000MHz frequency band used in PCS (Personal Communications Service: Personal Communications Service). (dual band: dual frequency band) code division multiple access (...

AI Technical Summary

Problems solved by technology

Therefore, like the front-end module described in Japanese Patent Application Laid-Open No. 2002-101005, the high-frequency module described in Japanese Patent Application Laid-Open No. 2002-43977 also has the problem that it cannot adapt to the CDMA method.

Images