| 摘要 |
The present invention provides a modulator which has a high degree of modulation and a good modulation sensitivity. The modulator comprises an oscillating circuit and a resonator portion, and this resonator portion comprises 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 the coupling line, a dielectric resonator which is disposed on the reflective circuit board and which is magnetically coupled with the coupling line, a window portion which is formed in the undersurface of the reflective circuit board directly beneath the coupling line, a waveguide resonator which is disposed on the undersurface of the reflective circuit board in the area that includes the window portion, and which is magnetically coupled with the coupling line, and a varactor diode which is inserted between the opposite signal conductor surfaces and of the waveguide resonator, and to which the input modulating signal terminal is connected. The other end of the coupling line constitute the output port of the resonator portion, and is connected to the input port of the oscillating circuit, and the end portion of the coupled load that is not coupled to the abovementioned coupling line is grounded.
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