Patent ID: 6720833
Filing Date: 2004-04-13
Classification: H03B,H03C,H03D

Abstract:
A modulator comprising an oscillating circuit and a resonator portion, said resonator portion comprising:a reflective circuit board; a coupling line which is disposed on the reflective circuit board; a coupled load which is coupled to one end of said coupling line; a dielectric resonator which is disposed on said reflective circuit board, and which is magnetically coupled with said coupling line; a window portion which is formed in the undersurface of said reflective circuit board directly beneath said coupling line; a waveguide resonator which is disposed on the undersurface of said reflective circuit board in the region that includes said window portion, and which is magnetically coupled with said coupling line; and a varactor diode which is inserted between the opposite signal conductor surfaces of said waveguide resonator, and to which the input signal terminal is connected, wherein the other end of said coupling line constitutes the output port of the resonator portion, and is connected to the input port of said oscillating circuit, and the side of said coupled load that is not coupled to said coupling line is grounded.