A wideband mechanically and electrically tunable negative resistance oscillator is disclosed wherein a low Q cavity is coupled to a high Q cavity at one end thereof by a narrow gap. A negative resistance R.F. diode is disposed in the low Q cavity in good heat conducting relationship with a massive heat sink. At the other end of the high Q cavity there is the mechanical frequency adjusting structure for tuning the high Q cavity over a wide frequency range. At one side of the high Q cavity, there ...

A circuit for the operation of an avalanche diode in the TRAPATT mode includes a capacitor connected in shunt with the diode and charged from a high impedance current source to a voltage which produces oscillations across the capacitor. Means are provided for varying the charging rate of the capacitor to vary inversely the frequency of the TRAPATT oscillations.

An active device comprises an IMPATT diode arranged on a heat sink block, a coaxial cavity resonator whose inner conductor of coaxial line is the supply means for supplying a DC bias to the oscillator element, a resonance circuit formed of that part of the inner conductor which is around the oscillator element, a step waveguide to which an output from the resonance circuit is transmitted through an output coupling part formed of the inner conductor and the outer wall of the coaxial cavity resona...

A pulsed high frequency, high power negative resistance oscillator is provided which does not change its instantaneous frequency due to pulsing to any perceptible amount and thus achieves a near perfect sin x/x frequency spectrum. The oscillator can produce up to 10 watts peak power with state of the art Gunn diodes and has a very high frequency stability with change in temperature.

A solid state oscillator in which a coaxial side arm is attached to a waveguide at an appropriate position in a manner to intersect it at right angles thereto; A Gunn diode, Impatt diode or like solid state oscillation device is provided at the intersecting portion, the solid state oscillation device having connected thereto the tip of an inner conductor of the coaxial side arm. The space in the waveguide in the neighborhood of the place where the solid state oscillation device is disposed is ma...

An improved combiner of microwave power out of a plurality of coaxial diode oscillators is shown to be made up of a circular cylindrical cavity dimensioned to operate in the TM.sub.020 mode at a selected microwave frequency, with such oscillators being disposed about the periphery of both end planes of such cavity and each individual one of such oscillators being reentrant at an angle of 180.degree. so as to double the number of such oscillators as compared with the number of straight coaxial di...

A power combiner using a circularly cylindrical cavity, dimensioned to support the TM.sub.020 mode, to combine the power from coaxial diode oscillators is shown to comprise: (a) a first plurality of such oscillators disposed about the periphery of such cavity; (b) a second plurality of such oscillators disposed in coincidence with the first spatial null in the electric field in such cavity; and (c) a plurality, similar in number to the second plurality of such oscillators, of electrically conduc...

A microwave oscillator suitable for millimeter wavelengths comprises a Gunn diode (3) coupled to a waveguide (1) by a resonant-cap structure (5,6). The diode (3) generates microwave energy both at a fundamental frequency f.sub.o which is below the cut-off frequency of the waveguide (1) and at a second harmonic frequency 2f.sub.o above cut-off. To control the generation of microwave energy at 2f.sub.o, energy at f.sub.o is coupled into the waveguide (1) from an adjacent further waveguide (9) abov...

A circuit for the operation of an avalanche diode in the TRAPATT mode including a resonator resonant at an integral multiple of the TRAPATT frequency of operation and being provided with a predetermined capacitance. The predetermined capacitance is charged from a high impedance current source to a voltage which produces TRAPATT oscillations of current in the diode. The oscillations of current of TRAPATT or fundamental frequency excite the resonator to provide oscillations at the resonant frequen...

A microwave combiner assembly is described incorporating a coaxial transmission line having a plurality of diodes exhibiting negative resistance at high frequency mounted between the center conductor and the outer conductor of the transmission line. Each diode is mounted on a segment forming a portion of the center conductor which are separated by slots containing lossy dielectric. A signal is capacitively coupled from each diode by capacitively coupling each segment to a common center conductor...