Abstract: The invention relates to a method and a device for generating high-power electromagnetic radiation. A transmission antenna of a transmission device capable of emitting an electromagnetic transmission wave is arranged in a reverberation cavity comprising openings. The method includes determining an electromagnetic temporal waveform F focused in a desired direction of focus outside the cavity; and emitting an electromagnetic transmission wave E having temporal waveform F into the cavity using the transmission device.

Abstract: The present invention is directed to a piezo-electrically actuated membrane (ex.—a tuner) configured for use with a tunable cavity filter. The piezo-electrically actuated tuner may be formed of printed circuit board materials and may be placed over the cavities of the tunable cavity filter. Further, the piezo-electrically actuated tuner may promote high level performance of the tunable cavity filter, while allowing the tunable cavity filter to be tunable across wide bands.

Abstract: The present invention relates to a flexible cap system optimized for thermally-compensated technology microwave resonators. More specifically, this invention proposes a multiple-membrane flexible wall system for thermally-compensated filters and OMUX. The use of a multi-membrane flexible wall, in particular as sealing cap for a resonant cavity of an OMUX channel, makes it possible: to reduce the thermal resistance of the flexible wall, while maintaining an equivalent level of mechanical stresses exerted on said wall for a given displacement; or to reduce the mechanical stresses exerted on the flexible wall for a given displacement, while maintaining one and the same thermal resistance for said wall; or to increase the deformation of the flexible wall by maintaining an equivalent level of mechanical stresses and by maintaining an equivalent thermal resistance.

Abstract: A recess waveguide microwave chemical plant for production of ethene from natural gas and a process for production of ethene using the plant. The plant includes a recess waveguide, a mode transducer and coupling orifice plate, an adjustable short-circuiting plunger, and a chemical reactor; wherein with the recess waveguide as a main body, the mode transducer and coupling orifice plate is at the left side of the recess waveguide, the adjustable short-circuiting plunger is at the right side of the recess waveguide, and the chemical reactor is across the recess waveguide.

Abstract: A system for accurate automatic satellite acquisition by a portable satellite terminal. The system includes a software program that coordinates inputs from several measurement aids to control antenna position. These aids include a GPS receiver, antenna azimuth, elevation and polarization angle sensors, and the terminal's modem, DVB receiver and spectrum analyzer, which contains a beacon detector also serving as Receive Signal Strength Indicator (RSSI). For satellite recognition, the spectral analysis and RSSI function are complemented by the lock/unlock indications provided by the modem and the DVB receiver. Under the control of the software program, the modem, DVB receiver and spectrum analyzer, in conjunction with an extensive database of satellites and their signal characteristics, provide the means for reliable validation of final alignment.

Abstract: A method for fabrication of a filter includes forming an input transformer pole in a first substrate by forming a first conductive via, forming an output transformer pole in the first substrate by forming a second conductive via, forming one or more filter poles in the first substrate between the input transformer pole and the output transformer pole by forming one or more conductive vias in the first substrate between the input transformer pole and the output transformer pole, fabricating one or more tuning elements on a second substrate, wherein the number of tuning elements corresponds to the number of filter poles between the input transformer pole and the output transformer pole, and bonding the second substrate to a top surface of the first substrate so that each tuning element on the second substrate is aligned with and overlays a filter pole on the first substrate.

Abstract: An actively tunable waveguide-based iris filter having a first part including a first portion of a deformable iris filter cavity having an inlet and an outlet; a second part operatively coupled with the first part and including a second portion of the deformable iris filter cavity having a deformable membrane operatively coupled with the first portion of a deformable iris filter cavity; the first portion and the second portion together forming the deformable iris filter cavity of the tunable waveguide-based iris filter; and means for moving the deformable membrane, whereby movement of the deformable membrane changes the geometry of the deformable iris filter cavity for causing a change in the frequency of a signal being filtered by the filter. The tunable filter is fabricated using a MEMS-based process including a plastic micro embossing process and a gold electroplating process. Prototype filters were fabricated and measured with bandwidth of 4.05 GHz centered at 94.79 GHz with a minimum insertion loss of 2.

Abstract: Disclosed is a method and apparatus for tuning a microwave apparatus. The chamber volume of the microwave apparatus can be changed by moving a flexible portion of a flexible wall while a perimeter portion of the flexible wall remains fixed.

Abstract: The aim of the invention is to provide a cavity resonator that has a great variable frequency area of a resonance frequency and is provided with good quality. Such a cavity resonator is provided with a round cross-section. The H11n in wave mode acting as the resonance wave mode exists in said resonator which is separated into two components with regard to the cross-sectional plane (5) thereof. The two cavity components (1, 2) can be displaced against each other in the direction of the common longitudinal axis (7) thereof.

Abstract: A tuning door is fabricated for a resonant cavity of a high frequency apparatus. Contact fingers are formed around the edge of a conductive plate. The plate is then fixed to a support by, for example, double sided adhesive tape. The conductive plate is part of the interior surface of the resonant cavity. The fingers may be formed in one operation, for example, by photoetching and are fully integral with the active surface to give optimum electrical conduction between them. Other types of high frequency apparatus may use contact fingers to provide electrical conduction between a movable wall and an adjacent conductive surface.

Abstract: The present matching circuit chip has an integrated shape comprising a first transmission line, a second transmission line and a third transmission line, wherein one end of the first transmission line, one end of the second transmission line and one end of the third transmission line are connected to one another, a first filter connection terminal is connected to the other end of the first transmission line, an antenna terminal is connected to the other end of the second transmission line, and a second filter connection terminal is connected to the other end of the third transmission line, whereby the second transmission line converts the characteristic impedances of the first and third transmission lines so that the impedance matching between the antenna terminal and the first filter connection terminal can be attained, and so that the impedance matching between the antenna terminal and the second filter connection terminal can be attained.

Abstract: A plurality of end caps engagable with a microwave cavity each have an underside configured differently to cause the microwave cavity to have different electrical responses depending on which end cap engages the microwave cavity. A microwave device includes a cylindrical cavity and an end cap movable within the cavity to change its axial position within the cavity thereby varying the volume and the electrical response of the cavity.

Abstract: An electromagnetic wave component uses one or more diaphragms secured to the interior of a waveguide structure to tune its resonant frequency, with each diaphragm engaged by one or more adjustment members that deform it. The adjustment members are preferably screws that are threaded through the structure to push and/or pull on the diaphragms, thereby tuning the electromagnetic wave component. The shift in the resonant frequency of the electromagnetic wave component due to temperature-induced dimensional changes is mitigated if the materials used for the diaphragm, the adjustment members and the structure which houses the diaphragm are chosen to have an appropriate combination of thermal coefficients of expansion.

Abstract: There is disclosed a radio frequency device having a housing, a cover disposed atop the housing, and a rod. A fastener such as a nut is attached to the rod and engages the cover. When the fastener is rotated, the cover moves with respect to the housing, thereby changing the volume of the cavity defined by the housing. In this fashion, the device may be tuned to different frequencies. In alternative embodiments, the rod is internally threaded and receives a screw that engages the cover. When the screw is rotated, the volume of the cavity is changed and the device may be tuned.

Abstract: The invention relates to a resonator coupling and a radio frequency filter, which comprise a transmission line resonator (106), preferably a helix resonator, having an upper and lower end, a transmission line (108, SL3) for coupling to the resonator, and a tap point (121), at which the transmission line (108, SL3) and the transmission line resonator (106) are in direct contact with each other, whereby the transmission line (106) is divided at the tap point (121) into a lower and upper part, the lower part comprising a first part (SL1) and the upper part comprising a second part (SL2). A coupling element (SL4) is placed at the tap point (121) in parallel with the transmission line resonator (106), coupled (M1) electromagnetically to the transmission line resonator (106), thus improving the stop/pass ratio of the filter.

Abstract: A multiplecavity klystron, which has a wide range of frequencies in which it can be used and is capable of operating at high frequencies, comprises first and second resonant cavities. At least one of resonant frequencies in TEM and TE11 modes of the second resonant cavity is lower than the operating frequency of the first resonant cavity, and the other of resonant frequencies in TEM and TE11 modes of the second resonant cavity is different from the operating frequency of the first resonant cavity.

Abstract: A simply structured cavity resonator for a multi-cavity klystron which can position a movable tuning element at a location where the element should be located with respect to a widthwise direction of the element. The cavity resonator of the multi-cavity klystron includes a cavity envelope, and a movable tuning element slidable on upper and lower internal surfaces of the cavity envelope. Each of left and right internal surfaces of the cavity envelope have continuously formed first and second areas. A spacing between the first areas of the left and right internal surfaces of the cavity envelope is equal to a width of the movable tuning element, while a spacing between the second areas of the left and right internal surfaces of the cavity envelope is larger than the width of the movable tuning element. The second areas correspond go an available frequency band.

Abstract: A microwave applicator device for continuous heat treatment of elongate products comprises an applicator housing that defines a generally rectangular waveguide cavity and at least one excitation system for exciting the cavity with microwaves propagating in TE.sub.01 transverse electric mode, the system including at least one microwave generator associated with a feed waveguide connected to the cavity via a window formed through a wall of the cavity. The front and rear walls of the feed waveguide are respectively connected to the front and rear edges of the window, and the feed waveguide is associated with a guide flap extending in the cavity in the vicinity of the rear edge of the window, and with a guide member provided substantially facing the window.

Abstract: A thermally compensating microwave cavity is provided. An active device that generates microwaves is disposed within this microwave cavity such that microwaves are emitted within the cavity. A first portion of these microwaves travels in one direction from the active device and forms a broad bandwidth signal. A section portion of the microwaves travels toward a reflecting member and is reflected. Once reflected, this second portion combines with and compensates the first portion. A temperature dependent bellows is utilized to displace the active device and the reflecting member relative to one another. Accordingly, as the signal emitted by the active device changes with temperature, the reflecting member is displaced by the bellows to properly reflect the second portion of the microwaves such that it combines with and properly compensates the signal.

Abstract: A microwave applicator device for the treatment of sheet or lap products comprising a housing defining a parallelepipedal waveguide cavity with dimensions a.times.b.times.L in an orthogonal coordinate system Ox, Oy, Oz, the housing being aligned along Oz and provided with slots for passing the product to be treated into the cavity along a plane parallel to the Ox, Oz plane, and means a microwave generator for exciting the cavity in Transverse Electric Mode, in order to create an electric field (E) internal to the cavity along a direction substantially parallel to Ox. The housing is such that the dimension a of the cavity is greater than a value substantially equal to the dimension b of the cavity.

Abstract: An autotuning combiner particularly for use in combining signals for radio telephony transmission. The combiner has a series of filter cavities each with an adjuster for fine-tuning the cavity to an input carrier signal. The combiner cavities are stabilized from positional drift in the absence of a carrier signal by means of a mechanical brake which holds the adjuster or a pilot signal generator which simulates the absent carrier signal.

Abstract: Three lead screws are provided for adjusting the position of a traversing plate. Each of the three lead screws is threaded through a collar that is press fitted through the center of one of three pinion gears. A sun gear meshes with all three pinion gears and transversely moves the three lead screws upon actuation of a drive gear. The drive gear meshes with the sun gear and is driven by a handle or servo motor. When the handle or servo motor rotates the drive gear, the sun gear rotates causing the three pinion gears to rotate, thus causing transverse movement of the three lead screws and, accordingly, transverse movement of the transversing plate. When the drive gear rotates, the traversing plate is driven in and out of a microwave cavity. Thus, the length or size of the cavity can be tuned while maintaining the traversing plate in an exact parallel relationship with an opposing plate on another end of the cavity.

Abstract: A concept previously used for providing anti-rotational locking of complementary threaded devices is utilized in a RF tuning cavity to minimize anti-microphonic disturbances of the prior art caused by inconsistent ohmic contact between the prior art adjustable length threaded portions. The use of a resilient locking strip embedded longitudinally into the threads of an adjustable resonator provides substantially constant electrical or ohmic contact between the two threaded portions so as to maintain a standing wave in the tuning element. The longitudinal design of the locking strip is such as to prevent or minimize movement of the extremity of the threaded resonator which movement can also effect the resonant frequency.

Abstract: Apparatus is disclosed in which a ring of microwave amplifiers are spaced around the top of a cavity closure structure containing upper and lower splitter and combiner cavities. The inputs and outputs of the amplifiers are connected by, respectively, input and output coaxial couplers to points in, respectively, the splitter and combiner cavities which are spaced radially outward of, and equiangularly around the centers of these cavities. In operation, input microwaves are distributed by the splitter cavity and input couplers to the amplifiers to be amplified by them in parallel, and the several microwave outputs of the amplifies are merged together by the output couplers and combiner cavity to provide a single amplified output. On the upper and lower sides of the splitter and combiner cavities are rigid metal plates with flat surfaces facing towards these cavities, and on the lower and upper sides of the splitter and combiner cavities are sheet metal dishes.

Abstract: A coaxial coupler unit has an outer conductor fastened to the outside of a first rigid metallic wall on one side of a microwave cavity, and the unit also has an inner conductor having at its front end an axially-fixed, angularly-turnable pin axially extending through a port in such first wall through said cavity to be inserted on the cavity's opposite side in a hole in a second deformable metallic wall bounding such side of the cavity. The pin has helical threads thereon engaging helical threads on the inside of the hole. The pin may, while remaining axially fixed, be angularly turned in opposite directions to displace the deformable cavity wall in opposite axial directions relative to the rigid cavity wall to thereby tune the cavity.

Abstract: An apparatus 10 with gears (22a, 22b, 22c, 25) for adjusting the position of a plate (13) in a cavity (12) and a rack (51) and gear (53) for moving a probe (15) into and out of the cavity is described. The apparatus includes knobs (34, 55) for controlling the movement of the plate and probe. Micrometers (37, 52) measure the precise position of the plate and probe in the cavity. The apparatus allows very precise tuning for selection of a mode of radiofrequency wave in the cavity and fine tuning within the mode.

Abstract: A microwave metallic cavity, whose resonating frequency is stabilized versus operating temperature variations. Stabilization is achieved by implementing the cavity with a conical base having a thickness and a coefficient of linear expansion smaller than that of the cavity cylindrical body. In this way the volume enclosed by the conical base to in inverse ratio versus operating temperature variations, so as to compensate for the variation in volume of the cavity cylindrical body, which results in stabilization of the resonating frequency.

Abstract: A microwave oscillator having very low phase noise characteristics has a reflection oscillator circuit coupled to a right-circular cylindrical resonant cavity designed to operate in the TE.sub.011 mode. The resonator length L and inner diameter D are restricted to a range of values such that (D/L).sup.2 is less than 2.5 but greater than 1.7. To suppress the TM.sub.111 resonant modes in the resonator, two techniques are employed. A single tuning post is disposed on either resonator end plate at a point where the TM.sub.111 electric field Z-component is a maximum. The post length is adjustably fixed to maximize the output microwave power at the cavity output port. Each end plate also has a continuous gap separating each plate from the housing to suppress electric field currents of the TM.sub.111 mode flowing on the inner surface of the resonator.

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 dominant TEM mode and a pair of spatially orthogonal TE.sub.11 modes suitably excited at the input ports of a coaxial waveguide commutator portion of a coaxial waveguide commutation feed network are employed to generate a commutatable low-sidelobe amplitude distribution at symmetrically disposed peripheral output ports of the coaxial waveguide commutator. The resulting low-sidelobe amplitude distribution can be used to feed radiating elements of an associated circular phased array antenna. The coaxial waveguide commutator is configured, inter alia, with a linearly tapered inner conductor surrounded by a uniform tube outer conductor to achieve a smoother TEM-dominant mode characteristic impedance transition from the input port plane to the output port plane thereof. Employment of this feed geometry, in conjunction with balanced four-port feeding of the coaxial waveguide commutator which inhibits the higher order TE modes, increases the bandwidth capability while maintaining low insertion loss.

Abstract: The invention concerns temperature stabilized resonant microwave cavities not requiring hermetic sealing and easy to be frequency adjusted, which essentially consist of a hollow body, a tuning screw, a plug and auxiliary lateral devices for coupling to the diode as well as of a termination, and are characterized in that the hollow body is filled with amorphous quartz. This hollow body consists preferably of an internal thin cartridge or vest made of precious alloy (Invar or Super Invar) forced into the hollow room of a thick support made of less precious material (aluminum).

Abstract: The invention provides a microwave feeder or applicator, that is to say a resonant chamber for coupling to a source of microwaves, arranged for the microwave treatment of a sample of material, comprising two main conductive walls extending parallel to a common axial direction and each having two projections and a central part joining the two projections, the projections of the two walls facing one another in pairs whereas the central parts of the two walls likewise face one another and define a region in which there is a local increase in the distance between the two main walls; a first conductive end wall forming a short-circuit and extending in a plane forming a cross-section of the main walls; a second conductive end wall forming a second short-circuit extending in a plane forming a cross-section of the main walls, and a coupling means for supplying microwave energy to the feeder, the dimensions of the cavity formed by the main end walls being arranged so that the cavity resonates almost exclusively in the

Abstract: A microwave apparatus comprising n aligned cavities 1 in each of which one of the walls is formed by a plunger 2 integral with a shaft 3. The n shafts 3 bear against n aligned stops 5. Several lines of n stops 5, against which the shafts 3 successively bear, are carried by a support 10 which in one illustrative embodiment comprises a cylinder of revolution the axis of rotation 00' of which is orthogonal to the shafts 3 of the plungers 2, the degree of penetration of each stop 5 with the support 10 being adjustable to adjust the resonance frequencies of the cavities.