Patent ID: 8125302
Filing Date: 2012-02-28
Classification: H01P

Abstract:
1. A signal selecting device, comprising: two input/output ports; N resonating parts having a ring conductor having a length equal to one wavelength at a resonant frequency or an integral multiple thereof and a plurality of switches each of which is connected to a different part of said ring conductor at one end and to a ground conductor at the other end; N+1 impedance transforming parts that adjusts impedance; and a controlling part that controls the state of said plurality of switches, wherein N is an integer equal to or larger than two, said N+1 impedance transforming parts said N resonating parts are disposed in series alternately between said two input/output ports, and said different part of each of said ring conductors is not a point where each of said ring conductors couples with a conductor transmitting a signal inputted into one of said input/output ports.