Abstract: A Gunn diode oscillator tuning mechanism includes a waveguide wall formed with a cavity at the outside of the wall for accommodating a tuning mechanism. A tuning rod opening extends between the inside of the waveguide wall and the cavity to snugly accommodate a sapphire rod. A holder carries the fixed end of the sapphire rod and is slidable in the cavity. The holder is formed with a circumferential sectoral slot that engages an annular ring on the rotatable translatable shaft of a micrometer adjacent to the holder seated in a holding plate at the outside of the waveguide wall.

Abstract: An external motor is coupled to a tuning rod extending into a resonant cavity of a transmitter combiner. A microprocessor tuning control system generates motor control signals that cause the motor to rotate the tuning rod, varying the resonant frequency of the cavity so as to minimize the reflected power from the cavity. Incident and reflected power are detected by diodes in the transmitter cable connecter of the cavity. The standing wave ratio is computed and composed with a threshold value to determine if the cavity needs to be retuned. The microprocessor effectuates reading of digital numbers representing the incident and reflected power and makes a "best effort" attempt to tune the resonant frequency of the cavity to the transmitter frequency, using the motor to rotate the tuning rod.

Abstract: The microwave apparatus for processing dielectric materials includes a number of tunable cavity devices arranged vertically one above the other, each having a movable piston. Dielectric conduit means extend downwardly through all of the cavity devices, passing through the various movable pistons. Each tunable cavity device has a microwave generator associated therewith so as to supply controlled amounts of power at frequencies depending upon the type of material being processed. The processing is monitored by additional cavity devices, each having a movable piston. Whereas the pistons of the power cavity devices are positioned so as to cause the material being processed to absorb a maximum amount of microwave power, the pistons in the monitoring devices are positioned so that a detectable amount of power is reflected. The amount of reflected power is indicative of an electrical characteristic, such as moisture.

Abstract: A waveguide filter for use in a communication system that treats microwaves or millimetric waves comprises waveguides of a U-shaped cross section and a support on which the waveguides are longitudinally connected in series. Two inductor plates bear on each of the waveguides to form a waveguide resonator. Each inductor plate has first and second planes meeting at right angles. Thus, each inductor plate assumes an L-shaped form. Each first plane covers the corresponding longitudinal U-shaped end of the waveguides. Each second plane covers half of the corresponding open bottom of the waveguides, and has a tongue formed by two notches. This tongue can be bent and inserted into the corresponding waveguide to adjust the center frequency of the passband of the bandpass filter formed by the waveguide filter.

Abstract: A dielectric resonator device includes a casing for defining a chamber in which a dielectric resonator and a piezoelectric frequency adjusting unit are provided. A portion of the piezoelectric frequency adjusting unit is located adjacent the dielectric resonator. By the voltage applied to the piezoelectric frequency adjusting unit, the piezoelectric frequency adjusting unit changes its shape thereby changing the distance between the portion of the piezoelectric frequency adjusting unit and the dielectric resonator. Thus, the resonance frequency of the dielectric device can be controlled.

Abstract: A microwave resonator is disclosed which includes a temperature-compensating structure within the resonator cavity configured to undergo temperature-induced dimensional changes which substantially minimize the resonant frequency change otherwise caused by temperature-induced changes in the waveguide body cavity. The temperature-compensating structure includes both bowed and cantilevered structures on the cavity endwall, as well as structures on the cavity sidewall such as a tuning screw of temperature-responsive varying diameter.

Abstract: A standing-wave accelerator including a plurality of accelerating cavities arranged along the axis direction of the accelerator; a plurality of coupling cavities provided between the two-adjacent accelerating cavities; at least one of the coupling cavities is provided with a detuning device for detuning the coupling cavity; and the detuning device is provided to be inserted from a first wall of the coupling cavity to extend until it comes into contact with a second wall thereof, spacedly passed between a pair of inwardly projecting posts.

Abstract: A microwave tuning device including a cylindrical metal bush having an internal screw thread. A metal rod-like plunger is axially displaceable within the plastics bush. A plastics bush is fitted over one end of the plunger and fixed thereto by means of splines and grooves. The bush is inserted into the internal screw thread so as to form a corresponding mating screw thread on its outer periphery. A plurality of fingers extend from one end of the metal bush and resiliently engage the outer periphery of a plain portion of the plunger so as to provide resistance to unintentional rotation of the plunger in the metal bush and electrical interconnection therebetween.

Abstract: A transmitter combiner includes a plurality of adjacent square prism filters, each of which shares at least one square wall with another of filters. Tuning of the individual square prism filters is accomplished by adjusting the position of tuning rods located in the high electric field region of each cavity. Tuning of each filter is achieved by rotating a control rod perpendicular to and extending through a rectangular end wall to pivot the tuning rod in that filter. In one embodiment of the invention, the control rod extends through a conductive tube attached along a square wall of the filter and perpendicular to the rectangular wall. In another embodiment of the invention, the control rod extends from the center of the rectangular wall and supports the tuning element near the center of the cavity. Temperature compensation is accomplished by variation in the length of the control rod as a function of temperature to compensate for changes in the dimensions of the cavity with the temperature thereof.

Abstract: A dielectric resonance apparatus for resonating in a TM mode such as TM 110 or the like. The apparatus includes a case having therein at least two TM-mode dielectric resonators, these resonators being oriented in the case so that their magnetic fields intersect each other. The apparatus also comprises means for coupling the magnetic fields. The TM-mode dielectric resonators may be integrally or separately formed. Each adjacent pair of resonators may be magnetically interconnected by an irregularly shaped portion of the case, such as a depressed portion or a projecting portion, for influencing the respective magnetic fields of each resonator by a selected degree, such that different respective degrees of influence are obtained with respect to the even and odd modes to be produced by the two resonators.

Abstract: Microwave dielectric resonator apparatus which, for example, may be a microwave oscillator frequency stabilized by a dielectric resonator or may be a microwave filter whose critical frequency is determined by a dielectric resonator, has the dielectric resonator environmentally protected in a hermetic chamber. As the hermetic integrity of the chamber would be destroyed by having a tuning slug therein at the end of a screw threaded into a tapped hole through a chamber wall for rotation by a screwdriver outside the chamber, the tuning slug is instead located within a non-hermetic chamber at the end of a screw threaded into a tapped hole through a wall of the non-hermetic chamber serving also as an outer wall of a housing enclosing both chambers. The chambers have an interface which is transparent to microwave fields and proximate the dielectric resonator and tuning slug.

Abstract: A dielectric resonator employing TM.sub.010 mode or its variation mode, and including a cavity resonator and a columnar inner dielectric member accommodated within the cavity resonator a region being formed at an end face of the inner dielectric member so as not to contact the cavity resonator, and a resonant frequency adjusting member being adapted to be movable toward or away from the region, thus adjusting the resonant frequency through variation of a capacitance value in a path passing through the columnar dielectric member, the resonant frequency adjusting member, and the cavity resonator.

Abstract: A sample cavity resonator for NMR spectroscopy contains a pair of diametrically opposed paraxial post structures approximating a single turn inductance about the axially positioned sample. The posts are separately excited in 180 degree relative phases by respective coupling loops spaced between the corresponding post and the cavity wall. A slideable piston structure capacitively couples to the posts and provides cavity tuning.

Abstract: A box-shaped metal microwave oscillator is provided having two pairs of substantially parallel, confronting inner surfaces, the second pair perpendicular to the first pair to define an oscillator cavity. The forward end of the cavity is walled off with a slotted wall to permit only a portion of the oscillator energy to be emitted. The spacing of certain of the walls and the location of the oscillator components to the wall is described.

Abstract: A structure comprising a cascade of dual mode resonance cavities wherein each cavity has a pair of tuning screws located at 90.degree. to each other in a sectional plane of the cavity and a coupling screw located at 45.degree. to the tuning screws for coupling the two resonances supported by the cavity. Each cavity is coupled to the adjacent cavity by means of a coupling iris set at a determined angle relative to the angular position of the tuning screws of the cavity and the adjacent cavity is positioned at a determined angle relative to the angular position of the coupling iris which couples said cavity to the former one.

Abstract: In a microwave device, particularly a microwave local oscillator, frequency variations due to temperature changes are reduced by supporting the tuning element, for example a quartz or sapphire crystal, in the end of a tube of INVAR or other material having a low thermal coefficient of expansion. The tube projects into the cavity from a hole in one wall thereof. Preferably the tube is positively located relative to the cavity by means of an external lip on the tube abutting a shoulder formed by a reduced diameter part of the hold adjacent the cavity. The lip may be urged into positive contact with the shoulder by a spring washer acting between the end of the tube and the opposed end of a bush screwed into the hole.

Abstract: A frequency agile magnetron employs an altitude compensation vacuum envelope external to the vacuum envelope of the magnetron. The tuning assembly of the magnetron includes a tuning plunger coupled through a first bellows assembly to one end of a tuning shaft. The tuning shaft is coupled at its opposite end through a second bellows assembly to the compensation vacuum envelope. When the two bellows assemblies are identical, atmospheric forces acting upon the tuning shaft are balanced at any altitude. Translation of the tuning assembly is provided by an actuator such as a linear motor coupled to the tuning shaft. Improved transfer of heat from the resonant cavity is provided.

Abstract: A microwave oscillator with TM01.delta. dielectric resonator is disclosed. The oscillator operates with a TM01.delta. mode as contrasted with prior art techniques of TE01.delta. mode. This provides for an improved tuning range in excess of 10% of the operating frequency.

Abstract: Apparatus for frequency tuning a waveguide cavity comprises a retainer ring and a knob that are threaded onto a plunger in a spaced apart relationship, with the plunger extending into the cavity. Means is provided for preventing rotation of the plunger and for securely rotatably mounting the knob on the cavity. Set screws in threaded holes extending through the knob protrude into blind holes in the ring for mechanically coupling them together. Lightly threading the screws into the blind holes reduces backlash in the threads so that rotation of the knob, and thus the ring, causes smooth and even movement of the plunger in the cavity. Tightening the screws firmly in the blind holes binds the threads on the knob, ring and plunger for preventing further rotation of the knob and movement of the plunger.

Abstract: The method according to the invention comprises winding a metal wire substantially helically both round a fitting constituted by a flexible strip and around two rods arranged parallel to the fitting axis and on either side of the fitting. The rods are eliminated when the metal wire is wound. The fitting comprises means limiting the displacement of the wire in accordance with the fitting axis, which coincides with the axis of the helix according to which the wire is found. These means are constituted by two rows of slots made in the lengthwise direction on two opposite edges of the strip constituting the fitting.

Abstract: A dual mode directionally coupled band reject filter apparatus having coaxially aligned first and second cylindrical cavity members which are asymmetrically mounted to the broadwall of a waveguide. Both cylindrical cavity members include a plurality of tuning screws to establish elliptic-type responses.

Abstract: An improved coaxial K inverter is disclosed for use in forming coaxial microwave filters. A filter including a K inverter may be constructed using at least one resonator including a conductor terminated at one end by an apertured plate and coaxially surrounded by a dielectric material. The resonator may be enclosed in a conductive housing electrically coupled to the apertured plate and capacitively coupled at the other end of the conductor to an input terminal for receiving microwave energy. A second conductor terminated at one end in a second apertured plate is positioned within the housing such that the apertured plates are adjacent one another forming a K inverter. The other end of the second conductor is capacitively coupled to an output terminal forming the electrical output from the filter.

Abstract: In a temperature-stabilized microwave filter, each resonant cavity (5) is tuned by means of a tuning rod (10) of a thermally stable material. A first end of each tuning rod (10) extends into the respective cavity (5) without touching its surface. A second end is clamped, remotely of the cavity (5), into the filter body (1-2). At the position of this second end the filter body (1-2) has a bore (13) of substantially the same diameter as the tuning rod (10). The tuning rods (10) are clamped by pairs of retaining screws (15) accommodated in clearance holes in the filter body on one side of a longitudinal groove (21) intersecting the bore (13) and anchored into the filter body (1-2) on the other side of the groove (21).

Abstract: A band-reject filter comprises a resonator with an adjustable resonator rod which is mounted in proximity to a co-axial assembly. The coupling rod passes thru the inner conductor of the co-axial assembly and extends into the resonator. At the end of the rod inside the resonator there is a coupling disc. Means are provided to adjust the distance between the resonator rod and the disc. The frequency rejected by the filter can be adjusted by either adjusting the length of the resonator rod or by adjusting the distance between the disc and the resonator rod.

Abstract: A dielectric filter module having an open housing which supports screws for adjusting the characteristics of the dielectric filter. The dielectric filter, which includes an elongated dielectric block having internal cavities and a conductive film extending from the exterior surface of the block into the internal cavities, is mounted in an openended metal housing which surrounds three sides of the dielectric filter. Suitable housings can be inexpensively fabricated to the necessary length from segments cut from commercially available channel members having C-shaped or I-shaped cross-sections. Wires extend through the open ends of the housing to connector elements on the surface of the block adjacent its ends. The connector elements can be adhesively secured metal members or locally deposited regions of metallic film. Either threaded holes on the housing or nut members mounted on the housing can be used for supporting the adjustment screws.

Abstract: In a standing-wave coupled-cavity linear particle accelerator the energy of the emergent particles can be adjusted by making the accelerating fields in one section of the accelerator different from those in another section into which the rf drive power is introduced. To do this the adjoining end cavities of the two sections are coupled through a "side" cavity which is not traversed by the particle beam. The coupling coefficients of the side cavity to the two accelerating cavities are made unequal to create the difference in accelerating cavity fields. Asymmetrical coupling is realized by varying the extension of center conductor posts into the side cavity by means of a vacuum sealed mechanism for moving the center posts while maintaining microwave current connection between the center posts and the side cavity.

Abstract: The tuning device comprises a hollow cylindrical part and a moving rod which penetrates a cavity by passing from one side to the other of the hollow cylindrical member. This cylindrical member is fixed and integral with the cavity. It has an end located within the cavity, the end being longitudinally cut to form n slots (n being an integer greater than 1) for forming n elastic members, which are covered with an electrolytic silver deposit. Joined silver contacts are welded to the end of the elastic members to provide the contact with the moving rod and prevent poor conduction of surface currents due to wear to the electrolytic deposit at the contacts.

Abstract: An efficient higher order mode resonant combiner in which a higher order mode accumulator cavity is adjusted to have the real part of its input characteristic impedance to be so minimized as to be less than the characteristic impedance Z.sub.o of the input circuit. When an active device is matched to this low, minimized value of cavity input impedance a mismatch results between the active device power source and the input to the combiner at undesired higher order modal frequencies. This resultant mismatch at undesired modal resonances obviates the need for mode suppression devices within the cavity which devices as taught in the prior art had detrimental effect of the efficiency of the combiner.

Abstract: Bandstop (FIGS. 1-3) and bandpass (FIGS. 4, 5) filters are presented utilizing broad and narrow wall resonator coupling in a rectangular waveguide (11 and 37) at a common cross sectional reference plane. For the bandstop filter, the resonators (12, 13) are resonant at a common frequency f.sub.0 to provide a two-pole bandstop response in a filter of minimal longitudinal dimensions. For the compact bandpass filter, each tone rejection is provided by a pair of resonators (31, 35) coupling to the electromagnetic field signal at two points one from a broad wall and the other from a narrow wall of the waveguide (37) but displaced by some multiple of a half wavelength. Another pair of resonators (33, 34) are in common cross sectional plane relationship to the first pair but located on a wall of different width to provide rejection of a tone at the other end of the passband. The use of resonators with different resonant frequencies at a common cross sectional plane avoids possible interresonator coupling.

Abstract: A microwave filter includes a plurality of resonator cavities which are separated by walls and which have respective resonator rods, and trimming caps made of a dielectric substance are fixed to the respective resonator rods.

Abstract: A constant resistance network which exhibits frequency dependent characteristics consists of a cavity resonator having two coupling loops mounted parallel to the walls of the cavity. The resonant frequency of the cavity is primarily determined by the dimensions of a resonator plate whose frequency of resonance can be trimmed by adjusting the size of a slot. The network can be used for combining the different frequencies by arranging that one of the frequencies is at the resonant frequency of the plate. The network can be extended by the provision of additional resonator plates to provide a more complex frequency response.

Abstract: The components of a transistor oscillator are mounted on an end cap rotatably mounted on the outer tube of a cavity resonator which stabilizes the oscillator. The intensity with which a high frequency is applied to the cavity resonator is adjustable by rotation of the end cap.

Abstract: Cavity resonators, preferably thermocompensated, with a straight-line frequency tuning, tuning elements of which move along a straight-line forced trajectory, and microwave circuits that contain such cavity resonators. At least one tuning element is connected to the cavity, made up of structural elements that are displaceable along a forced trajectory when the elements are in a forced coupling with a straight guide path formed on the structural element. The latter can be swung around an axis which is perpendicular to the direction of movement of the tuning element, the latter being provided with a roller that bears against the guide path. The cavity resonators are furthermore provided with frequency-linear adjusting members that can be displaced along the straight forced trajectory on the latter, also provided with a roller which bears against the guide path that is in a forced coupling with the structural element.