Abstract: A dielectric waveguide which has a pair of dielectric substrates affixed to each other and a pair of electrically-conductive layers on the external surfaces of the two dielectric substrates. Each dielectric substrate has a projecting part that is thicker than other parts. A propagating region is formed where the projecting parts on the two opposing dielectric substrates are put together. Furthermore, a circuit is formed on the contact surface between the dielectric substrates. The circuit may include an electronic component. A part of the circuit is arranged in the propagating region so as to provide electromagnetic-field coupling between the circuit and the dielectric waveguide.

Abstract: A combined test fixture and spatial-power-combined amplifier includes a base, a first waveguide mounting flange engaged to said base, a second waveguide mounting flange engaged to said base, a waveguide input fixed to said first flange, a waveguide output fixed to said second flange, an amplifier array disposed between said first flange and second flange, said array comprising a plurality of semiconductors for amplifying a signal, and a spacer for spacing apart said semiconductors. A plurality of amplifier cards constitute the array, with the cards being disposed in various arrangements which include a linearly stacked arrangement and radially stacked arrangement. The first and second waveguide mounting flanges are constructed to slide along the base to enable the amplifier array to be easily changed.

Abstract: A conducting film is formed on a dielectric block in a dielectric waveguide resonator, and a through-hole is formed in the dielectric block. The unloaded Q is set by selecting the outside dimensions of the dielectric block. The resonance frequency is set by selecting the size and location of the through-hole as well as the outside dimensions of the dielectric block. A terminal electrode is formed on the outer surface of the dielectric block. A coupling hole is formed in the dielectric block and a coupling electrode is formed on the inner surface of the coupling hole. One end of the coupling electrode is connected to the terminal electrode and the other end of the coupling electrode is connected to the conducting film formed on the outer surface of the dielectric block. The above structure increases the degree of freedom in the design of the characteristics, including the resonance frequency and unloaded Q, of the dielectric waveguide resonator.

Abstract: An NRD waveguide band-pass filter apparatus is provided which is simple in construction, which can be easily manufactured as well as being small in size and light in weight, and which operates in a single operating mode. The NRD waveguide band-pass filter apparatus includes a plurality of NRD waveguide resonators arrayed in such a way that each two adjacent NRD waveguide resonators are electromagnetically coupled to each other. A plurality of arrayed rectangular dielectric waveguides are interposed between an upper surface portion and a lower surface portion of a rectangular dielectric housing, which are parallel to each other. The upper surface portion and the lower surface portion and the plurality of arrayed rectangular dielectric waveguides are formed integrally, thus forming the housing. A first superconducting electrode and a second superconducting electrode are formed on the outer surfaces of the upper surface portion and the lower surface portion, respectively.

Abstract: A waveguide device for transmitting and processing microwave signals includes a plate structure having recesses forming waveguides for the transmitting the microwave signals between microwave components. The plate structure includes a body plate and covering plates for connection to opposite surfaces of the body plate. The body plate and the covering plates form delimiting surfaces for the waveguides, and the microwave components can be positioned in the body plate or the covering plates.

Abstract: An antenna-shared distributor is provided such that a non-conductor section is provided in a part of two conductor planes, a dielectric resonator which resonates in the HE111 mode is disposed between the conductor planes, and first and second dielectric strips whose respective end portions face the dielectric resonator are disposed, forming first and second dielectric lines and further, a voltage-controlled oscillator and a mixer are connected to the first and second dielectric lines, respectively.

Abstract: An antenna includes a cylindrically shaped dielectric resonator placed on a longitudinally extended axis of an elongated dielectric strip disposed on a planar conductor and another planar conductor having an opening covers the dielectric strip with the opening on the dielectric resonator. There may be another dielectric strip placed perpendicularly to the first dielectric strip such that the dielectric resonator is where the lines longitudinally extended from the axes of both dielectric strips will cross.

Abstract: A method and apparatus for efficiently interconnecting a large number of high frequency high bandwidth signals includes two interface plates (100, 200), each having two substantially coplanar faces, a mating face (110, 210) and a non-mating face (120, 220). Each interface plate has waveguides (116, 216) disposed between the coplanar faces such that when the mating faces of the interface plates are brought together, a plurality of waveguide connections are made. An energy absorbing gasket (300) having a hole pattern matching the waveguide pattern is disposed between the mating faces of the interface plates so that reflections caused by misalignment and non-coplanarity of faces can be reduced.

Abstract: The present invention is directed to a system for using the ductwork of a building for transmitting electromagnetic radiation. The system includes a device for introducing electromagnetic radiation into the ductwork such that the ductwork acts as a waveguide for the electromagnetic radiation. The system also includes a bi-directional coupler positioned to re-radiate the electromagnetic radiation around an obstacle. The system further includes a device for enabling the electromagnetic radiation to propagate beyond the ductwork. The present invention is also directed to a method for transmitting electromagnetic radiation using the ductwork of a building and a method for designing a system for transmitting electromagnetic radiation in the ductwork of a building.

Abstract: An intersect-line apparatus has two conductor plates. An HE-mode dielectric resonator and four dielectric strips to be coupled to the resonator are disposed between the two conductor plates. The adjacent four dielectric strips are spaced from each other substantially at 90 degrees. Accordingly, signals propagating in two strip lines positioned substantially at 180 degrees and signals propagating in the remaining two strip lines cross each other within the dielectric resonator without interfering with each other.

Abstract: A diode circuit in a dielectric waveguide device designed to improve the facility with which a circuit substrate is mounted in the dielectric waveguide, to make matching between a dielectric waveguide and a diode easier, and to reduce conversion losses, and a detector and a mixer using such a diode circuit. A conductor pattern is disposed so as to intersect a pair of dielectric strips substantially perpendicularly to the same, and two filter circuits are formed in the dielectric pattern on opposite sides of the dielectric strips, thereby forming a resonance circuit. A diode is mounted in the resonance circuit in series with the conductor pattern.

Abstract: A small and inexpensive planar dielectric line that can be easily connected to electronic parts, such as ICs, and has smaller conduction losses. The planar dielectric line includes a dielectric substrate having first and second surfaces opposedly facing each other. A first slot having a predetermined width is interposed between first and second electrodes on the first surface of the dielectric substrate. A second slot having the same width as the first slot is disposed between third and fourth electrodes on the second surface of the dielectric substrate. The first and second slots opposedly face each other. The permittivity and the thickness of the dielectric substrate are determined so that a planar electromagnetic wave can propagate in a propagation region of the substrate interposed between the first and second slots while being substantially totally reflected on the first surface of the substrate adjacent to the first slot and the second surface of the substrate near the second slot.

Abstract: A dielectric waveguide has a dielectric member disposed between a pair of parallel conductor flat surfaces, such that a propagating region and a non-propagating region are formed. The spacing between the conductor flat surfaces in the non-propagating region is determined to be smaller than that in the propagating region. The above-mentioned spacings and the dielectric constant of the dielectric member are determined such that the cut-off frequency of the LSM.sub.01 mode propagating through the propagating region is lower than the cut-off frequency of the LSE.sub.01 mode and that electromagnetic waves of both the LSM.sub.01 mode and the LSE.sub.01 mode are cut-off in the non-propagating region, so that any transmission loss attributable to a mode conversion between the LSM.sub.01 mode and LSE.sub.01 mode occurring at, for example, a bend of the waveguide is eliminated so as to facilitate production of the waveguide having a desired bend angle and radius of curvature.

Abstract: A wiring board of the present invention is equipped with a laminated waveguide as a high-frequency signal transmission line.

Abstract: The present invention is directed to a system for using the ductwork of a building for transmitting electromagnetic radiation. The system includes a device for introducing electromagnetic radiation into the ductwork such that the ductwork acts as a waveguide for the electromagnetic radiation. The system also includes a device for enabling the electromagnetic radiation to propagate beyond the ductwork. The present invention is also directed to a method for transmitting electromagnetic radiation using the ductwork of a building and a method for designing a system for transmitting electromagnetic radiation in the ductwork of a building.

Abstract: A nonradiative planar dielectric line exhibits low transmission losses and is easily connectable to electronic components. A first slot is provided between two electrodes on a first main surface of a dielectric plate. A second slot is provided between two electrodes on a second main surface of the dielectric plate. A first conductor is electrically connected to the electrodes on the first main surface and also covers the first slot. A second conductor is electrically connected to the electrodes on the second main surface and also covers the second slot. An integrated circuit using the above type of dielectric line is also provided. Thus, apparatuses using the above dielectric lines or integrated circuits are miniaturized.

Abstract: A waveguide feed is fabricated by first creating a lead frame (10) from a piece of conductive material. The lead frame (10) is shaped by bending arms (22) and probe portions (18) on the lead frame (10) into a desired shape. The lead frame (10) is then placed in a mold and dielectric molding material is added around relevant portions of the lead frame (10). After the dielectric molding material has solidified, excess molding material and extraneous portions of the lead frame (10) are removed from the molded feed assembly. The assembly can then be connectorized and inserted into a waveguide.

Abstract: A multilayer dielectric line circuit in which a dielectric line circuit has a multilayer structure so as to be easily formed with a small overall size. In one form of the invention, first and second dielectric strips and first and second dielectric resonators are provided between respective adjacent pairs of conductor plates. The first dielectric strip and the first dielectric resonator, the first and second dielectric resonators, and the second dielectric resonator and the second dielectric strip are each coupled electrically or magnetically so as to couple the respective dielectric strips in the different layers.

Abstract: A method for designing an aperiodic grating structure for mode conversion and control which is based upon an inverse scattering optimization procedure. In accordance with this method, no predetermined shape or material variation of the grating structure is assumed. A constrained domain of all surfaces and material variations is searched to find an optimum aperiodic conversion surface profile for maximum conversion efficiency into the required output mode(s) or optimum control. Accordingly, the present method results in the design of rough surfaces or non-homogeneous structures for mode conversion and control. Because this method relies on scattering produced by short, forceful field perturbations, it is possible to achieve very small conversion lengths which are much less than one grating period.

Abstract: A technique for forming imbedded microwave structures in a microwave circuit package is presented. In one method, windows are punched, stamped or molded into metal laminate plates. A metal laminate layer is formed by fusing each of the metal laminate plates one on top of another, preferably using a diffusion bonding technique. The metal laminate layer is fused on top of a metal base plate, which is adhered to a ceramic substrate, and a shielded cover is fused on top of the metal laminate layer to form the imbedded waveguide structure as the base plate, metal laminate plates, and cover plate are fused together. In another method, indented cavities are formed in a shielded cover. The shielded cover is then fused, preferably using a diffusion bonding technique, to a metal base plate, which is adhered to a ceramic substrate.

Abstract: The ease of mounting a circuit board on a nonradiative dielectric line is improved, the degree of freedom of conductor film patterns formed on the circuit board is increased, and the degree of integration can be easily increased to fit within a small size. Dielectric strips are provided between the two conductor plates positioned in parallel to each other, and a circuit board is positioned parallel to the conductor plates. The conductor patterns on the circuit board and the transmission waves of the nonradiative dielectric line are electromagnetically coupled to each other.

Abstract: A dielectric-line component (such as an oscillator or circulator) has a dielectric strip between a pair of electrically conductive flat-plates. The component is to be combined with another dielectric-line component which also has dielectric strips between a pair of conductive plates. When these components are assembled, a pair of conductive plates of the respective two components opposedly face each other at a first position, while the other pair of conductive plates of the respective two components opposedly face each other at a second position. The first and second positions are displaced from each other in the vertical direction and in the length direction in relation to the conductive plates. Further, the opposing faces of the dielectric strips of the two components are positioned in an area defined by the first and second positions, either between the first and second positions or at one of the first and second positions, for example.

Abstract: A feed system for an antenna has a set of inner and outer coaxial waveguides which apply, respectively, both higher and lower frequency radiations to a common radiating aperture provided by a horn and shroud which envelops radiating apertures of the individual feed waveguides. Each of the feed waveguides carries signals having a bandwidth of an octave. Lower frequency radiation to be transmitted by the outer coaxial feed waveguide is applied thereto by a set of four waveguides of a launcher which launches a wave with a desired propagation mode into the outer feed waveguide. Each of the launch waveguides is initially a rectangular double-ridged waveguide for increase bandwidth. The ridging is reduced to a condition of no ridging in the outer feed waveguide by a transition to a single inner ridge which terminates in a tapered star-shaped combination ridge within the outer feed waveguide.

Abstract: A transmission medium consists of a dielectric waveguide shielded by a metal guide. The guide is particularly suitable for providing low insertion loss, convenient transfer of power from one such transmission line to another and for the trouble free handling of high power levels at many hundreds of watts. This type of transmission medium may be used to provide low loss combination of power signals that is low loss, compact while containing the solid state power amplifying elements (MMICs) and capable of high power.

Abstract: An electromagnetic wave propagation structure, suitable for the transmission of an electromagnetic wave and the formation of resonators within filters, is constructed of both high and low dielectric-constant materials wherein the high dielectric-constant is in excess of approximately 80 and the low dielectric-constant is less than approximately 2. A boundary between the high and the low dielectric-constant materials serves as an electric wall to waves propagating in the low dielectric-constant material and as a magnetic wall to waves propagating in the high dielectric-constant material. This permits substitution of the high dielectric-constant material for metal elements, such as resonators and feed structures in filters. Furthermore, the use of a cladding of dielectric material of one of the foregoing dielectric ranges about a core of material of the other of the foregoing dielectric ranges enables construction of waveguides having rectangular and circular cross-sections.

Abstract: Systems and methods for guided wave antennas are described. Apparatus is disclosed comprising: a dielectric nonphotoconductive waveguide defining a principle axis; a grating carrier connected to the dielectric nonphotoconductive waveguide, the grating carrier i) including a photoconductive material and ii) defining a photoconductive axis that is substantially parallel to the principle axis; a spatial light modulator optically connected to the layer of photoconductive material; and a source of illumination optically connected to the spatial light modulator and the layer of photoconductive material.

Abstract: A nonradiative dielectric line is provided which solves problems concerning the relative positioning of the parts, mass production, and variations in electrical characteristics of a dielectric strip, and which makes integral molding using injection molding technology possible. A height of a dielectric in the propagation area is made higher than the height in the non-propagation area, and a dielectric layer having a low dielectric constant is provided in the non-propagation area. Thus, the thickness of the dielectric layer in the non-propagation area can be increased.

Abstract: A scanning antenna is disclosed including: a rotatable cylinder having an outer surface; a continuously, or steppingly, varying period conductive grating pattern of separated strips on the outer surface, the varying conductive grating pattern of separated strips defining a grating axis; and a first elongated dielectric waveguide defining a first waveguide axis, the first elongated dielectric waveguide being located proximally adjacent and alongside the varying conductive grating pattern of separated strips so as to evanescently couple electromagnetic signals with the first elongated dielectric waveguide. The scanning antenna provides advantages in that the gain is high.

Abstract: An innovative nonradioactive dielectric waveguide (NRD guide). Protrusions are separately formed on a surface of a dielectric strip. Recesses corresponding to the protrusions are formed on a parallel conductive plate. The dielectric strip is set between top and bottom parallel conductive plates such that the small protrusions on the dielectric strip are fitted into the recesses on the bottom parallel conductive plate.

Abstract: In high frequency apparatus such as for example an rf resonant cavity or a waveguide, it is often necessary to include a slot to permit a probe or other member to be located in the high frequency region and be moveable along the slot. Sealing means arranged adjacent to the slot and around the probe permits movement of the probe whilst minimising the open aperture area of the slot, hence preventing or reducing leakage through it. In one embodiment of the invention, the sealing means comprises a metallic mesh and in another it includes an elastomer material which is loaded with metallic material and/or carries a metallic mesh.

Abstract: A waveguide evanescent mode filter is integrated with a monolithic microwave integrated circuit (MMIC) by forming both the MMIC circuitry and the waveguide filter on a single substrate that forms a common ground plane for both elements. The waveguide has a superstructure with an interior recess that is contoured to provide a desired cutoff frequency. The underlying portion of the ground plane can form the lower portion of the waveguide itself, and can also be contoured to define the cutoff frequency. Adjustable attenuation is provided by a resistive card that can be inserted by different amounts into the waveguide.

Abstract: Dielectric circuit components such as a dielectric strip, dielectric blocks and dielectric ring inserted between conductive plates are molded from a thermoplastic material. As the thermoplastic material, thermoplastic resin is used which has a dielectric constant not greater than 2.4. The dielectric circuit components may be injection-molded from an injection-moldable high polymer material which contains fluorine and has a melting point not greater than 300.degree. C.

Abstract: The ease of mounting a circuit board on a nonradiative dielectric line is improved, the degree of freedom of conductor film patterns formed on the circuit board is increased, and the degree of integration can be easily increased to fit within a small size. Dielectric strips are provided between the two conductor plates positioned in parallel to each other, and a circuit board is positioned parallel to the conductor plates. The conductor patterns on the circuit board and the transmission waves of the nonradiative dielectric line are electromagnetically coupled to each other.

Abstract: A waveguide seal assembly for a waveguide joint is fabricated in separate parts, including a relatively small inner conductive part for surrounding the coupled waveguide openings in the joined waveguide flanges of two joined waveguide sections, an outer conductive part having a central opening which permits the outer part to fit over the inner part such that an intermediate gap is formed between the inner and outer parts, and a gas sealing element, suitably in the form of an O-ring, fitted into this intermediatex gap. Preferably, an O-ring groove is provided on the outer perimeter of the inner conductive part for retaining the O-ring when the seal assembly is installed. Also, preferably the inner conductive part is slightly thicker than the outer part to ensure good electrical contact at the coupled waveguide openings.

Abstract: A dielectric resonator capable of resonating at a predetermined resonance frequency has a dielectric substrate, a first electrode formed on a first surface of the dielectric substrate and having a first opening, a second electrode formed on a second surface of the dielectric substrate and having a second opening, a first conductor plate disposed by being spaced apart from the dielectric substrate by a predetermined distance, and a second conductor plate disposed by being spaced apart from the dielectric substrate by a predetermined distance. The region of the dielectric substrate defined between the first and second electrodes, a free space defined between the first electrode and the first conductor plate and another free space defined between the second electrode and the second conductor plate are cut-off regions for attenuating a high-frequency signal having the same frequency as the resonance frequency.

Abstract: A leakage dielectric waveguide includes a housing made of plane-shaped electrical conductors located parallel to each other, and a dielectric strip for propagating a high-frequency wave between the parallel electrical conductors, wherein the dielectric strip is provided within the housing. The housing is arranged to be asymmetrical, thereby leaking and radiating a high-frequency wave propagating through the dielectric strip. The housing is preferably further composed of the plane-shaped parallel electrical conductors and a side wall. A plane antenna includes the above-mentioned leakage dielectric waveguide, and a projecting device for projecting the high-frequency wave toward a free space in response to a high-frequency wave being projected from the dielectric waveguide.

Abstract: A high-frequency integrated circuit which operates in a microwave band or in a millimeter wave band. The high-frequency integrated circuit has a plurality of devices with respective nonradiative dielectric waveguides such as an oscillator, a coupler, etc., and a substrate on which these devices are surface-mounted. Each of the devices has a pair of parallel conductors, a dielectric strip which is disposed between the conductors and propagates a high-frequency electromagnetic wave, a mounting surface which is formed on one of the conductors and is in contact with the substrate, and an end surface which is defined by an end of the conductors so as to be vertical to a traveling direction of the electromagnetic wave propagated in the dielectric strip and at which an end of the dielectric strip is exposed. The devices with a nonradiative dielectric waveguide are evaluated separately, and thereafter, the devices are surface-mounted on the substrate close to or in contact with one another.

Abstract: A microwave antenna comprises a single moded metal waveguide tapering inwardly to a cutoff dimension near the distal end thereof. The antenna also comprises a first solid dielectric waveguide mounted coaxially within the distal end portion of the metal waveguide and tapering outwardly toward the inwardly tapering portion of the metal waveguide. The first dielectric waveguide extends beyond the distal end of the metal waveguide in the axial direction. The antenna also comprises a second dielectric waveguide surrounding the first dielectric waveguide beyond the distal end of the metal waveguide and having a dielectric constant lower than the dielectric constant of the first dielectric waveguide. A distal end portion of the first dielectric waveguide tapers inwardly toward the axis thereof, to launch signals propagating toward the distal end of the first dielectric waveguide into the second dielectric waveguide.

Abstract: An NRD guide circuit is assembled by arranging, on a lower conductive plate, a positioning member of a material (e.g., foaming styrol resin, foaming urethane or the like) having a dielectric constant smaller than that of a dielectric strip, followed by placing such component parts of the NRD guide circuit as a dielectric strip at a position delimited by the positioning member, whereafter an upper conductive plate is secured thereto.

Abstract: The invention relates to a resonator shell construction, comprising at least two metallic shell modules (41-44) connected to each other to form a modular shell construction, each module enclosing at least one resonator cavity (42-52). The modules comprise wall portions (41a-41c, 42a-42c, 43a-43c, 44a-44c) projecting from the modules, said wall portions being connected to one or more modules, whereby one or more new resonator cavities (61-68) are formed between the modules.

Abstract: A waveguide absorber which withstands high mechanical and thermal loads is typified in that a member (4) exhibiting absorber material is clamped between waveguide walls (5, 6) in such a way that at least one wall region (5) adjoining the member (4) is constructed flexibly, and that a force acting on the flexible wall region (5) presses the latter against the member (4).

Abstract: A high-frequency integrated circuit which operates in a microwave band or in a millimeter wave band. The high-frequency integrated circuit has devices with a nonradiative dielectric waveguide such as an oscillator, a circulator, etc., and a mount case with a nonradiative dielectric waveguide in which these devices are mounted. Each of the devices with a nonradiative dielectric waveguide has a couple of conductors, a dielectric strip which is disposed between the conductors and propagates a high-frequency electromagnetic wave in a specified mode, a mounting surface which is formed on one of the conductors, and an end surface which is formed on an end of the conductors so as to be vertical to a traveling direction of the electromagnetic wave propagated in the dielectric strip and on which an end of the dielectric strip is exposed. The devices with a nonradiative dielectric waveguide are evaluated separately, and thereafter, the devices are mounted in the mount case individually.

Abstract: An antenna device for receiving a radio wave transmitted from a communication satellite, converting the received radio wave into an electric signal, amplifying the signal, and outputting the amplified signal to a receiver is capable of quickly resuming a radio wave reception in the event of a failure. The antenna device includes a converter assembly having a straight waveguide and a twisted waveguide for supplying polarized radiowaves in the same direction to two LNBs, which are oriented in the same direction and fixed to a fixing adapter that is slidably mounted on a holder unit. Even when one of the LNBs suffers a failure, the other normal LNB can be used as a spare LNB and simply moved to replace the malfunctioning LNB. Therefore, any malfunctioning LNB can be replaced easily for quick resumption of a radio wave reception. A satellite communication reception system employs such an antenna device.

Abstract: A measuring jig which is used to measure characteristics of a device with a nonradiative dielectric waveguide which operates in a microwave band or in a millimeter wave band. The measuring jig has a mount section on which a device with a nonradiative dielectric waveguide is to be mounted, and a converting section which connects the device to an external circuit. The converting section has a couple of parallel conductors, a dielectric strip which is disposed between the conductors and propagates a high-frequency electromagnetic wave in a specified mode, and an end surface which is formed on an end of the conductors so as to be vertical to a traveling direction of the electromagnetic wave propagated in the dielectric strip and on which an end of the dielectric strip is exposed.

Abstract: A unitary waveguide element is employed in a light weight waveguide antenna. The waveguide element has a waveguide portion having a front wall with slots formed across it at predetermined locations, a continuous back wall, and substantially continuous broad walls. A first flange is formed on one of the broad walls lying in a plane that extends in the width direction. A pair of flanges are formed on the other broad wall that lie in planes that are displaced slightly from the first flange, so that when the waveguide element is superposed onto the next successive element, these flanges overlap with the second flanges straddling the first flange. The flanges are then bonded with epoxy or an equivalent agent. A rivet box is formed on the proximal side of the back wall and permits attachment of the waveguide element in precise alignment to a predrilled backing plate with rivets or other suitable fasteners. The rivets do not penetrate into the waveguide portion of the element.

Abstract: A scanning antenna is disclosed including: a rotatable cylinder having an outer surface; a varying period conductive grating pattern of separated strips on the outer surface, the varying conductive grating pattern of separated strips defining a grating axis; and a first elongated dielectric waveguide defining a first waveguide axis, the first elongated dielectric waveguide being located proximally adjacent and alongside the varying conductive grating pattern of separated strips so as to evanescently couple electromagnetic signals with the first elongated dielectric waveguide. The scanning antenna provides advantages in that the gain is high.

Abstract: A flexible waveguide tube is applicable for a desired millimeter wave band with maintaining sufficient strength for satellite application. The flexible waveguide tube includes a bellows portion and flexing at the bellows portion. The flexible waveguide tube further comprises a dielectric body disposed within the waveguide tube, the dielectric body being placed in spaced apart relationship with at least one inner peripheral surface of the bellows portion.

Abstract: A semiconductor device includes a substrate having a microwave semiconductor element, a microwave transmission line disposed on the substrate and electrically connected to the microwave semiconductor element, and a waveguide terminal structure disposed in the substrate and connected to an end of an external waveguide, wherein an end of a signal conductor of the microwave transmission line is included in the waveguide terminal structure. Input and output of microwave signals between the semiconductor device and an external device are carried out simply by applying an end of the external waveguide to the waveguide terminal structure. As a result, even when the substrate of the semiconductor device warps, an input-output characteristic evaluation of the semiconductor device is carried out with high stability.

Abstract: A dielectric waveguide has a pair of parallel flat metallic plates spaced from each other, a dielectric strip sandwiched between the parallel flat metallic plates, and a wave absorber sandwiched between the parallel flat metallic plates and extending parallel to the dielectric strip. The wave absorber has a tapered portion which is progressively closer to the dielectric strip in a direction away from an inlet end of the wave absorber. The wave absorber has a side surface which may be held in contact with a side surface of the dielectric strip to provide a termination for eliminating reflections of input electromagnetic waves applied to the nonradiative dielectric waveguide, or may be spaced from a side surface of the dielectric strip to provide an attenuator for attenuating the power of input electromagnetic waves applied to the nonradiative dielectric waveguide.

Abstract: A microwave waveguide is presented which includes a gas tight seal which provides pressure isolation between two portions of the waveguide. In accordance with an important feature of this invention, an upper flange includes a threaded axial opening for receiving and retaining a threadably mated dielectric filling material. If the thread pitch is small relative to the signal wavelength, the threaded section has essentially the same electrical characteristics as a smooth waveguide. The resulting structure provides an economical and practical method of retaining a solid dielectric filling material in a waveguide against high pressure without changing the effective diameter of the waveguide. In accordance with another feature of this invention, a novel high pressure seal is provided between the upper and lower flanges in the area surrounding the threaded axial opening.