Abstract: A micro-resonator ferrite microstrip coupling filter that has reduced susceptibility to variations in the manufacturing process, as well as from changes due to mechanical or environmental stress, and allows for an assembly process that can be easily automated. The filter comprises bottom and top substrates with conductive ground planes on one side of the substrates and microstrip conductors on the other side of the substrates, with the conductors of both substrates being orthogonal to each other. A circuit block is disposed between the bottom and top substrates such that the circuit block contacts the sides of the substrates containing microstrip conductors. Multiple YIG spheres are inserted into round orifices on the circuit block and positioned between the bottom and top substrates. A magnetic field is applied orthogonally to the conductors.

Abstract: A spherical resonator device includes a resonant sphere around which transducers for electrical coupling are metallized layers on a flat surface shaped to provide exposure of a sphere to a quasi constant field. In particular, the pattern comprises a transmission line of non-constant width in the region proximate to the sphere where a taper is provided which increases in width with distance from the sphere.

Abstract: A ferrite resonating device operative for example as an oscillator or filter includes a mechanism for mechanically varying the position of a permanent magnet while maintaining a fixed main gap in which a ferrite resonating element is placed so that wide tuning can be achieved while maintaining electrical parameters substantially constant.

Abstract: A frequency synthesizer is described which operates over a wide frequency range at high resolution and variable step size without trading off between spurious frequency rejection and phase noise suppression. The synthesizer includes a magnetically-turned YIG oscillator which generates a desired output frequency from a received tuning signal. The output signal is fed back into a phase locked loop which generates the tuning signal. The phase locked loop includes a harmonic mixer for mixing the output signal with a reference frequency F.sub.2. The mixer receives a base frequency signal and a harmonic select signal resulting in the generation of the reference signal, F.sub.2. The mixed signal is input to a programmable divider, then to a phase detector which receives another reference signal, F.sub.1. The phase detector output is the tuning signal which is coupled to the YIG oscillator. Both reference frequencies, F.sub.1 and F.sub.2, are derived from a common base frequency.

Abstract: An electronically tunable solid-state microwave frequency source comprises a transmission-absorption filter incorporated within a magnetic structure. The transmission-absorption filter is employed with a tunable solid-state oscillator and tunable solid-state multiplier to provide a continuously tunable microwave signal source with enhanced spurious signal attenuation over a multiple-octave tuning range. The filter structure comprises a sphere of monocrystalline garnet such as yttrium iron garnet (YIG) and two coupling loops disposed in the field region of an adjustable field DC magnet. The coupling loops are disposed orthogonal to the magnetic field and to each other. In a specific embodiment the first coupling loop is operative to receive at its input the fundamental frequency signal and at its output is grounded, and the second coupling loop is operative to receive a harmonic input signal at its input and to convey a desired output signal at its output.

Abstract: A solid-state microwave signal amplifying and multiplying apparatus capable of substantially continuous tuning over an extended frequency range in the microwave region. A single gallium arsenide metal semiconductor field-effect transistor (MESFET) is switchably coupled by means of PIN diodes through selected output matching networks consisting of relatively narrowband frequency sections. Bias to the MESFET is provided through PIN diodes in a manner to select a linear (fundamental frequency) or nonlinear (multiplied frequency) operating region. In this manner a single microwave active device may be utilized with a plurality of passive networks to achieve extremely wideband amplification meeting good amplification and impedance matching criteria.