| 摘要 |
PURPOSE:To attain more stable oscillation even when a FET except a package FET is used by connecting a drain terminal of the FET to ground via an inductor and connecting a source terminal of the FET via a capacitor to ground. CONSTITUTION:A microwave oscillator causes the oscillation at the resonance frequency of a dielectric resonator 5 by means of a resonance circuit comprising the dielectric resonator 5 having a high Q and a strip line 4. An inductor 2 acts like increasing the negative resistance at the oscillation frequency caused at a gate terminal under the drain ground condition of a chip FET 1. Further, a capacitor 14 acts like increasing the negative resistance further at the oscillating frequency caused at the gate terminal 11 of the chip FET 1. Moreover, the drain terminal 13 of the FET 1 is connected to ground via the inductor 2 having a proper element value and the capacitor 4 having a proper capacitance whose one terminal is connected to ground is connected to the source terminal 12 of the FET 1 to obtain a stable oscillator.
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