| 摘要 |
PURPOSE:To prevent the oscillation at an undesired mode by using an output line coupled electromagnetically to a dielectric resonator so as to extract an oscillated output in an MIC (microwave integrated circuit) microwave oscillator. CONSTITUTION:A GaAs FET11 as an oscillating element is used on an MIC substrate so as to form a band oscillator and a drain D is grounded directly. A gate electrode G of the oscillating element 11 and a land 6 for capacitor are connected via a resistor 5 and a line 1, and a dielectric resonator 4 coupled electromagnetically with the line 1 is provided. Further, in order to extract an oscillated output, an output line 12 coupled electromagnetically to the resonator 4 and placed close to the resonator 4 is provided. A source line 3 is adjusted so that the impedance of the oscillating element of said oscillator viewed from the gate 1 shows a negative resistance. Since the oscillating frequency depends on the resonator 4 only, the oscillation at the undesired mode is prevented. |
