Patent ID: 7106146
Filing Date: 2006-09-12
Classification: H01P

Abstract:
1. A high frequency switch comprising: a first semiconductor substrate; a first signal line provided on the first semiconductor substrate and having a first main line, and first branch lines that branch into four or more from the first main line via a first branch point and first transmission lines each having a length of a ¼ wavelength of a signal propagated over the first branch lines, said each first transmission line being contained in part of said each first branch line; and first switching elements each of which is shunt-connected between the first branch line on the end side of the first transmission line as viewed from the first branch point of the first signal line, and a ground end and electrically connects or shuts off the first branch line and the ground end in accordance with a control signal; wherein connecting points of the first switching elements at the two first branch lines are spaced such that isolation corresponding to the frequency of the signal reaches between 25 dB and 35 dB at the ends of the two first branch lines, and the first switching element to which a control signal is applied, is provided between the two first branch lines, and first resistors and first capacitors connected in series are further provided and shunt-connected between first control signal lines connected to control electrodes of the first switching elements and the ground end.