Switch device and portable communication terminal

  • US 20030181167A1
  • Filed: 09/26/2002
  • Published: 09/25/2003
  • Est. Priority Date: 02/19/2001
  • Status: Active Grant
First Claim
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1. A switch apparatus for switching between signal paths of at least a first, second and third frequency bands, wherein said switch apparatus is characterized by comprising:

  • a diplexer having a first signal terminal which is a transmission/reception signal terminal shared by said 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 the remaining signal after said signal of said first frequency band is separated, wherein said received signal inputted to said first signal terminal 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 has a plurality of switching means respectively configured with diodes, and selectively switches between two signal terminals to be connected to said second signal terminal of said diplexer, and said second high-frequency switch has at least three switching means respectively configured with FETs, and selectively switches between at least three signal terminals to be connected to said third signal terminal of said diplexer.

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