Patent ID: 7212788

Claim:
An RF front end architecture, comprising: a set of multiple antenna ports; multiple power amplifier PA devices configured to feed signals to at least one of the antenna ports; multiple low noise amplifier LNA devices configured to receive signals from at least one of the antenna ports, wherein each LNA device is paired with one of the PA devices and configured to receive signals from the antenna port to which its paired PA device is configured to feed signals; a transmit/receive switch coupled between each paired PA and LNA and its corresponding antenna port; and antenna diversity switches connected to inputs of the PA devices and/or outputs of the LNA devices, wherein said transmit/receive switch, for each paired PA and LNA, comprises: a shunt switch that grounds an output of the PA device; a first ¼ wavelength wire or equivalent network connected to an output of the PA device and the shunt switch at one end and connected to the antenna port at another end; and a second ¼ wavelength wire or equivalent network connected to an input of the LNA device at one end and connected to the antenna port at another end.