Patent ID: 6389269
Filing Date: 2002-05-14
Classification: H04B

Abstract:
A transmitter for transmitting a radio frequency (RF) communication signal in a first RF band and in a second RF band comprising:A power amplifier (PA), having a PA output, said PA for amplifying said RF communication signal, in said first RF band and in said second RF band; a first transformer comprising a first node, a second node, a first transmission line coupled between said PA output and said first node, and a first parallel capacitor coupled between said first node and said second node, said first transformer for fully transforming the impedance of said RF communication signal in said second RF band to a first fully transformed impedance at said first node, and said first transformer for partially transforming the impedance of said second RF communication signal in said first RF band to a second partially transformed impedance at said first node; a first path having a third node, a fourth node and a fifth node, a second transmission line coupled between said first node and said third node, a second parallel capacitor coupled between said third node and said second node, a third transmission line coupled between said third node and said fourth node, a third parallel capacitor coupled between said fourth node and said second node, and a first filter coupled between said fourth node and said fifth node for passing only said communication signal in said first RF band; and a second path having a sixth node, a seventh node, a third filter coupled between said first node and said sixth node, a fourth transmission line coupled between said sixth node and said seventh node, a fourth parallel capacitor coupled between said seventh node and said second node and a second filter coupled between said seventh node and said fifth node, for passing only said second RF communication in said second RF band.