Patent ID: 6970718
Filing Date: 2005-11-29
Classification: H04B

Abstract:
1. A mobile communications terminal apparatus, comprising: a switch apparatus for switching between signal paths and including: a diplexer having a first signal terminal forming a transmission/reception signal terminal shared by signals of at least said first, second and third frequency bands, a second signal terminal for outputting a signal of said first frequency band separated from a received signal, a third signal terminal for outputting a remaining signal after said signal if said first frequency band is separated, wherein said received signal inputted to said first signal terminals, is divided between said second and third signal terminals, and transmission signals to be inputted to said second and third signal terminals are combined and outputted to said first signal terminal; a first high-frequency switch connected to said second signal terminal of said diplexer; and a second high-frequency switch connected to said third signal terminal of said diplexer, wherein said first high-frequency switch includes a plurality of switching means respectively configured with diodes for selectively switching between two signal terminals for connection to said second signal terminal of said diplexer, and said second high-frequency switch includes at least three switching means respectively configured with FETs selectively switching between at least three signal terminals for connection to said third signal terminal of said diplexer, wherein said first signal terminal of said diplexer of the switch apparatus is connected to an antenna; a transmission/reception circuit for said signal of said first frequency band is connected to said two signal terminals of said first high-frequency switch; a transmission/reception circuit for said signal of said second and third frequency band is connected to said at least three signal terminals of said second high-frequency switch; and short circuit means having serially connected FETs connected between one of said three signal terminals and electrical ground and having a terminal for receiving a control signal for controlling said serially connected FETs to connect said one of said three signal terminals to electrical ground.