Patent ID: 7593703

Claim:
A frequency switch for use in a multiband and/or multistandard power amplifier module, comprising: at least two output ports, a first output port being arranged within a first output path and a second output port being arranged within a second output path, said output ports being connected with a common input port via said output paths, each output path being provided with at least one RF block, each RF-block including a capacitor, a switching element and a quarter-wave line section, whereby the capacitor is connected in series with the switching element and the quarter-wave line section, and the quarter-wave line section is connected in series with an output port, wherein for each RF-block a predetermined frequency band is selected and the length of said quarter-wave line section is matched to said selected frequency band in order to block incoming signals in said selected frequency band if the switching element of the corresponding RF-block is switched on.