Patent ID: 7295814
Filing Date: 2007-11-13
Classification: H04B

Abstract:
1. An antenna switch circuit connected to a common antenna for switching the connection of said antenna to a transmission circuit or a receiving circuit in plural transmitting/receiving systems having different passbands, comprising a diplexer circuit comprising a low-pass filter and a high-pass filter; a first switch circuit connected to said low-pass filter and comprising pin-junction diodes, transmission lines and at least one capacitor for switching a transmitting line and a receiving line; a second switch circuit connected to said high-pass filter and comprising pin-junction diodes, transmission lines and at least one capacitor for switching a transmitting line and a receiving line; a third switch circuit comprising FET switches connected to said first switch circuit for switching said receiving line from said first switch circuit; and a fourth switch circuit comprising FET switches connected to said second switch circuit for switching said receiving line from said second switch circuit, wherein said third and fourth switch circuits share a control power terminal.