Abstract: An on-chip antenna switching scheme for Gigahertz frequencies where for the transmission path a first on-chip switching means is coupled between an on-chip power amplifier and an antenna. In the receiving path a second on-chip switching means at an input to an on-chip low noise amplifier (LNA) connects to ground. Coupled off-chip between the first switching means and antenna and antenna and the second switching means are impedance matching means and a half and a quarter wavelength line, respectively. In transmission mode both switching means are closed, in receiving mode both switching means are open. This allows for optimal transmission of the signal in either direction.