Abstract: A frequency stabilized oscillator includes a rectangular resonant cavity having a ground or short circuit wall, an H wall, and a top wall having an inductive window therein. A solid-state oscillating device such as a GUNN diode is attached at one end thereof to the short circuit wall, and a disk type dielectric resonator is supported from the short circuit wall and is located substantially adjacent the solid-state oscillating device so as to electromagnetically couple with the oscillating device. The inductive window is located so as to be in substantially overlying relationship with the dielectric resonator. A strip conductor is attached to the upper end of the oscillating device and extends through the H wall to the exterior of the oscillator to thereby provide a DC supply terminal for the oscillating device. The H wall of the resonant cavity is isolated from the DC supply applied to the strip conductor by means of a thin insulating layer between the strip conductor and the H wall.

Abstract: The description covers temperature stabilized resonant microwave cavities not requiring hermetic sealing and easy to be frequency adjusted. Essentially, they consist of a pure quartz body with a metallized surface, except for small superficial areas used for the couplings.

Abstract: An electromagnetic cavity filter (10) is formed by at least two cavities (12) having electrically conductive walls (40, 15). When more than two cavities (12) are employed, their midpoints do not have to be colinear; rather, it is sufficient that the angle formed by the midpoints of any three successively coupled cavities is an integral multiple of 90.degree.. Thus, a folded "engine block" geometry can be realized such that the filter's input cavity (12) is proximate to the output cavity (12). This allows a canonic filter response. Each cavity (12) is the equivalent to two filter poles because two orthogonal modes of electromagnetic radiation can resonate therewithin. Electrically nonadjacent modes of proximate cavities (12), as well as electrically adjacent modes, can be coupled, permitting elliptic filter functions. Electrically nonadjacent modes are coupled by means of an iris (30) opening between the two cavities (12).

Abstract: An equalizer cavity apparatus which is directionally coupled to a rectangular waveguide utilizes a circular waveguide with an adjustable RF absorber therein to lower the quality factor, Q, of the equalizer cavity.

Abstract: A dielectric resonator has a sector shape, and a filter has a signal source for emitting signal to be filtered, signal receiver for receiving the filtered signal and a path defined between the signal source and the signal receiver. At least one sector shaped dielectric resonator is disposed in the path.

Abstract: A cylindrical ENDOR cavity with RF saddle coils disposed axially is symmetrized by shielding the end portions of the saddle coil within cylindrical conducting rings or cylinder portions whereby the Q of the cavity is substantially enhanced.

Abstract: A test head for ENDOR-triple experiments comprising a cylindrical cavity resonator provided with means for exciting the TM.sub.110 mode and a spiral arranged in concentric relation to the cavity axis and connected to the inner conductor of a coaxial line. The walls of the cavity resonator (5) are provided at two diametrically opposite points with projections (4) projecting into the interior of the cavity resonator, consisting preferably of a poorly conductive material and extending over the full height of the cavity resonator. The projections are formed by tubes (14) recessed into the walls of the cavity resonator and enclosing sections (20, 21) of the turns of a modulation coil (19) intended for modulating a D.C. magnetic field (B.sub.0) existing in the cavity resonator in vertical relation to the plane comprising the projections.

Abstract: A device for cooling a superconductive resonator has a tube for containing liquid coolant and a diffusion weld connecting an outer face of the tube with the resonator wall in a heat-exchanging relationship therewith.

Abstract: A piezoelectric resonator comprises a crystal having an outer peripheral portion connected to a central portion by an intermediate zone which is short in the radial direction, is hollowed out over its major part and has at least two connector bridges between the outer and central portions. Electrodes are arranged facing one of the main portions of the crystal which then forms the vibrating portion of the resonator. The non-vibrating main portion serves as a support for the crystal. The surfaces of the connector bridges are continuous with the corresponding surfaces of the vibrating portion.

Abstract: A cubical device includes six square sides connected to form a cube. Each side has an electrically conductive inner surface electrically connected to the other inner surfaces. A plurality of electric field probes attached to coaxial connectors centrally mounted on respectively perpendicular sides of the cube extend into the volume bounded by the cube. In one embodiment of the invention, three opposing pairs of electric field probes extend into the volume from opposite sides of the cube. The electrical cube then functions as three independent bandpass filters, each having a "Q" determined by the volume. In another embodiment of the invention, an output probe extends into the cavity at a predetermined angle and senses the standing wave patterns produced in response to the electric field probes, whereby the cubical apparatus functions as a bidirectional combiner for up to three channels.

Abstract: Compactness and substantially optimum electrical performance are realized in a microwave filter incorporating a housing (21, 22) including an interior surface that forms an enclosed cavity having planar cross sections substantially elliptical in shape (FIG. 3). At least one axis of each ellipse monotonically increases in length with perpendicular distance from a first surface (23) toward a second surface (24). A dielectric resonator (11) is positioned in a predetermined relationship within the cavity and at least two terminal members (30,35) extend from outside the housing (21,22) into the cavity. Electromagnetic coupling between the housing (21,22) and the dielectric resonator (11) is minimized to afford substantially optimum electrical performance of the microwave filter.

Abstract: A rotary coupler of the non-contact type has folded resonant spaces when seen in radial section. A large central lead aperture may be provided.

Abstract: In a microwave delay equalizer for an input signal of a microwave frequency having an inevitable delay distortion, a directional coupler and a pair of resonators are placed, respectively, on a center area of a conductive base member and on those side areas thereof which lie on both sides of the center area. The coupler comprises a pair of distributed-constant elements electromagnetically coupled to each other either with an air space or a dielectric plate interposed therebetween and to the respective resonators to derive from the input signal supplied to one of the elements a delay equalized output signal in the other element. Each element has a length equal to an odd multiple of a quarter wavelength of the signal travelling therealong. Each resonator consists of at least one resonance piece.

Abstract: This invention relates to a cylindrical, electron beam collector that efficiently couples the microwave energy out of a high power microwave source while stopping the attendant electron beam. The interior end walls of the collector are a pair of facing parabolic mirrors and the microwave energy from an input horn is radiated between the two mirrors and reassembled at the entrance to the output waveguide where the transmitted mode is reconstructed. The mode transmission through the collector of the present invention has an efficiency of at least 94%.

Abstract: A band rejection coaxial filter for use with a coaxial transmission line, for example, comprises a casing made of a conductive material and having an internal geometry selected to be in a cut off state with respect to the frequency of a signal being transmitted along the coaxial transmission line. The casing is coupled to the coaxial transmission line and a leakage coaxial cable is provided in the casing, so as to be coupled to the coaxial transmission line through the casing. The leakage coaxial cable is formed of a plurality of leakage openings spaced apart from each other a quarter wave length of the resonance frequency of the resonators in the axial direction for allowing for leakage of the transmission signal. A corresponding plurality of dielectric resonators are provided spaced apart a given distance from and faced to the leakage openings, so that a portion of the transmission signal of the frequency determined by the dielectric resonators is trapped.

Abstract: A filter for very short electromagnetic waves is disclosed in which a plurality of resonators are formed in a row with each resonator containing two filter circuits. The resonators are operated in a dual mode and the filter circuits are arranged in an electrical sequential manner. First and last filter circuits in a direction of the transmitted energy are provided with input and output lines, respectively. At least one additional coupling is provided between at least two filter circuits which do not directly follow one another in electrical sequential fashion. At least one of the resonators provides two filter circuits which are not adjacent with respect to one another in electrical sequential fashion and are coupled via an additional coupling.

Abstract: A filter for very short electromagnetic waves having a plurality of resonators which are coupled to one another and which are operated in the dualmode. The first and last resonators, as viewed in the direction of energy transmission, are provided with connection lines for the supply and discharge of electromagnetic energy. An additional coupling is provided between at least two filter circuits which are not directly consecutive in the electrical mode of operation and the individual resonators are arranged in juxtaposed rows. The resonators are arranged to be mechanically symmetrical relative to the center of the circuit, and the equivalent circuit diagram on which the construction is based is selected to be asymmetrical in respect of the element values, in such a manner that the number of additional couplings agrees with the theoretically determined, minimum number of additional couplings.

Abstract: The single-sided microwave applicator has a section of a microwave waveguide with an open end for receiving microwave energy and an end which is electrically shorted. A slot is located in one of the wide sides of the waveguide extending along the center line from the shorted end. A conductive ridge is mounted within the waveguide extending upward from the other side through the slot. One end of the ridge is connected to the shorted end of the waveguide, while the other end of the ridge is tapered from a point within the slot. The slot is generally in the order of 3/4 to 1 inch and at least 21/2 inches long, when the operating frequency is 2450 MHz. Since one end of the waveguide is shorted, standing waves are produced resulting in a non-uniform field having at least one maximum along the length of the slot. The electric field produced is non-radiating and its strength diminishes exponentially above the slot.