Abstract: A two-terminal field effect transistor device which is capable of operation as an oscillator including a field effect transistor connected in a two-terminal manner. The transistor has the usual drain source and gate electrodes and oscillating instability is provided by means of an inductance means of value so as to provide this circuit instability to enable circuit oscillations. The two-terminal arrangement is enabled by means of essentially interconnecting the gate and drain electrodes by way of said inductance means.

Abstract: A combined mounting and tuning structure for a dielectric resonator comprised of a stack of a dielectric resonator body, a resilient body of dielectric material and an electrical tuning conductor. A fastening means preferably in the form of a dielectric screw threadedly engaged in a base wall of an enclosure and by turning the fastening means, the tuning conductor is brought closer to the resonator, and the resonant frequency of the resonator is thereby adjusted while also providing a clamping force on the stack so as to maintain its position relative to the base wall. The dielectric resonator tuner of the invention is shown in oscillator and filter circuit embodiments.