Patent ID: 8416032

Claim:
A semiconductor switch comprising: a main line; a plurality of branch lines branching from said main line at the same branch point; switching devices, each switching device being shunt-connected between one of said branch lines and ground, and operated by a control voltage so that said branch line is electrically connected to and disconnected from ground in response to the control voltage; a main terminal connected to a first end of said main line; and branch terminals, each branch terminal being connected to a first end of one of said branch lines, wherein impedance of a first of said branch lines, as seen from said branch point, is conjugately matched to a combination of impedance of said main line and all other of said branch lines, as seen from said branch point, said first of said branch lines transmits an RF signal, all other of said branch lines block the RF signal, each of said branch lines includes a first transmission line and has a first switching device connected to said first transmission line, a first end of said first transmission line is connected to said branch point, a second end of said first transmission line is connected to the branch terminal of said branch line, a first end of said first switching device is connected between said second end of said first transmission line and said branch terminal, a second end of said first switching device is grounded, and said main line has a lower characteristic impedance than said first transmission line.