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.

Abstract: A dipole antenna is inserted into a waveguide to couple EM energy into and out of a waveguide. The dipole antenna is printed on a substrate of a module that contains electronic components. The substrate includes a coupled coplanar strip transmission line connecting the dipole antenna to a slotline. EM energy is electromagnetically coupled between the slotline and a microstrip transmission line. The EM energy is provided to and from the hermetically sealed electronic components by the microstrip transmission line.

Abstract: A nonradiative dielectric waveguide which includes a first housing and a second housing. The first housing and the second housing respectively include first and second dielectric units and conductor electrodes. The first and second dielectric units are respectively integrally formed with first and second planar portions, and first and second dielectric strip line portions extending outwardly from said first and second planar portions and by a predetermined height, with abutting faces generally parallel with the conductor electrodes and being provided at top portions of said dielectric strip line portions. The conductor electrodes are respectively formed in close contact with faces of the first and second dielectric units remote from the abutting faces. The first and second housings are overlapped so as to make the abutting faces confront each other. The first and second dielectric strip lines portions cooperate to propagate electromagnetic waves.

Abstract: A phase shifter for shifting the phase angle of microwaves traveling in a waveguide of a microwave circuit. The phase shifter includes a dielectric plate which has first and second parallel surfaces, a distal edge, a proximate edge, a leading edge, and a trailing edge where each of the edges defines the outer bounds of the first and second parallel surfaces. The dielectric plate is shaped like a parallelogram lacking any right angles and is made of a microwave low loss dielectric material such as polystyrene or polytetrafluoroethylene. The height of the dielectric plate is less than one half the height of the waveguide side wall and the length is less than one guide wavelength long. The phase shifter fine tunes a resonating microwave circuit and provides approximately three-quarters of an inch adjustment of microwave circuit length.

Abstract: A microwave assembly having molded thermoplastic components that are first assembled into an enclosure, and then electroless copper plated to provide for RF conductivity. Assemblies are made by bonding bare thermoplastic components, after which the bonded assembly is electroless copper plated. The components are made of an injection molding material, polyetherimide, or a high strength, high temperature thermoplastic. The components are assembled using a one component epoxy adhesive, for example. All components are designed to be self locating to aid in assembly. A bonding fixture is used to apply clamping pressure to the components while the adhesive cures. After bonding, the waveguide assembly has its critical flange surfaces finish machined prior to plating.

Abstract: A fixture for determining RF characteristics of a dielectric medium comprises a first coupler having an RF through-window with input and output ports, the input port connectable to a waveguide input. A second coupler has an RF through-window with input and output ports, the output port connectable to an output waveguide. A plurality of rods are aligned with the axes of the input and output waveguides and connect the output port of the first coupler to the input port of the second coupler. Each rod is passable through the dielectric media and mates with the input port so as to form a continuous waveguide passing through the dielectric media.

Abstract: Waveguide filters having a laminated dielectric structure for resonating at a predetermined frequency and having a series of longitudinally spaced resonators. A selected plural number of individual layers of high dielectric low temperature co-fired ceramic are laminated into a monolithic structure and then plated with a conductive material. Each of the individual layers is dimensioned and the number of layers is selected so that the unit resonates at the predetermined frequency. A waveguide filter is also described where a select plural number of contiguous layers of low temperature co-fired ceramic are laminated and plated with a conductive material. A series of vertically placed vias are positioned so as to form a perimeter of a waveguide filter. A plurality of individual layers of low temperature co-fired ceramic are laminated to the monolithic structure to form a laminated unit so that electrical components and the waveguide filter can be integrated into a single package.

Abstract: A method of fabricating a microwave waveguide component wherein a plurality of joinable thermoplastic members are first formed. The members, when joined, comprise a microwave waveguide component having an internal surface that is adapted to be plated. The thermoplastic members are then bonded together. Then, the internal surface is plated to form the finished microwave waveguide component. The present method forms microwave components from plated, injection molded thermoplastic and reaction injection molded thermosetting plastics. In particular, the plastic components made using the present invention exhibit comparable electrical performance, as measured by voltage standing wave ratio (VSWR) and insertion loss, decreased device weight and cost, and reliable and repeatable manufacturability when compared with devices formed using metals, conventional thermosetting plastics that have been metallized, and molded, plated and soldered thermoplastics.

Abstract: A hermetically sealable millimeter waveguide launch transition feedthrough for channelling high frequency electrical signals in a circuit which includes at least one waveguide. An aperture is formed in one wall of the waveguide and a conductive pin passes through the aperture. The pin is sealed therein by a dielectric material which surrounds the pin so as to isolate it from the waveguide wall. A probe head is disposed at one end of the conductive pin and within the waveguide. The opposite end of the pin contains a second probe head or other circuit connector. The transition may be effectively implemented in waveguide-to-waveguide or waveguide-to-device applications as well as in colinear device housing applications.

Abstract: In a pulse compression device, the pulses to be compressed being frequency modulated, the device comprises at least one transmission line, the cut-off frequency of which varies along its axis of propagation and means for the separation of an incident wave and a reflected wave, loaded by the transmission line and receiving the pulses to be compressed which get reflected along the transmission line, the variation of the cut-off frequency and the frequency modulation of the pulses being matched with each other. Application: high power pulse compression in microwave transmission. FIG. 3a.

Abstract: A short horn antenna (10) adapted for array use includes a rectangular waveguide with broad upper (12) and lower (14) walls and narrow side walls (16, 18), defining a radiating aperture (20) and a feed end closed off by a shorting plate (22). A stepped upper ridge (26) has a slot (50) adjacent the shorting plate, and a shorter stepped lower ridge (46) has a corresponding slot. An unbalanced transmission line (75) extends through the shorting wall, and the smaller conductor (76) extends into the waveguide as an electric probe (60). The probe includes a first portion (64), extending parallel to the waveguide axis (8) and into the slot in the upper ridge. The probe (60) also includes a second portion (66) extending at an angle (90.degree.) relative to the first portion (64) of the probe (60).

Abstract: A variable width waveguide scanner includes a pair of spaced apart waveguides defined by U-shaped sleeves each having an open end. A U-shaped plunger having spaced apart parallel first and second arms is coupled to the waveguides such that the arms are received by the open ends of the sleeves and are reciprocatingly slidable in the sleeves. A plurality of radiating elements in the form of spaced apart slots are formed in an end wall of each waveguide.

Abstract: An improved radiofrequency wave apparatus (10) which provides a relatively large diameter (on the order of magnitude 500 millimeters) plasma (56) for the coating of a material on a surface of a substrate (50) is described. The apparatus has a movable stage (54), which is used to change the position of the substrate with respect to the plasma. The radiofrequency waves are preferably microwaves or UHF waves (2.45 GHz or 915 MHg). The apparatus has a probe (30) which is mounted along the longitudinal axis (A--A) through a sliding short (16). The apparatus operates in the TM mode and is particularly useful for uniformly coating a relatively large surface of the substrate (or a number of smaller surfaces of substrates at the same time) with a material which is formed in the plasma. The apparatus has been used for depositing diamond films on a number of substrates (Si, Si.sub.3 N.sub.4 and the like).

Abstract: A microwave power combiner includes a first plate having disposed in a first surface thereof a first plurality of grooves and a second plate having disposed in a first surface of said second plate a second plurality of grooves, with said second plate being mated to said first plate and with said first plurality of grooves in the first plate disposed in alignment with the second plurality of grooves in the second plate to provide a plurality of waveguide regions. The waveguide regions are further disposed to provide a plurality of hybrid Ts preferably matched hybrid Ts or magic Ts which are selectively interconnected to form an integrated combiner structure. A first surface of the plate is used to mount a plurality of IMPATT diode modules whereas the second opposite surface of the composite plate is used to mount a heat sink thereby providing a thermal path between the diode modules through the composite plates to the heat sink.

Abstract: The disclosed waveguide branch separating filter can be modularly constructed of a basic frequency separating filter and of a filter expansion unit. Both the basic frequency separating filter as well as the filter expansion unit are composed of a reactively terminated (including short circuit) feeder waveguide to which the separating filters are coupled. The expansion of the basic frequency separating filter occurs in largely disturbance-free fashion during operation in that the reactive termination (including short circuit) thereof is mechanically replaced by the filter expansion unit and is electrically simulated during the refitting by a short-circuit plate or by short-circuit pins.

Abstract: A data processing system and housing are disclosed having reduced electromagnetic energy emissions. A central processor is mounted within a generally rectangular conductive outer case which includes one or more apertures for receiving and mounting electronic subassemblies such as: diskette drives; fixed disk drives; tape drives; and, optical disk readers. A conductive waveguide assembly having at least one waveguide is then mounted within the conductive outer case with one end of the waveguide mated conductively to the aperture within the conductive outer case. Electromagnetic energy from the electronic subassembly or from within the conductive outer case must then traverse the conductive waveguide prior to emission from the data processing system housing through the aperture therein. The shielding effect of requiring electromagnetic emissions to traverse an internal waveguide will provide substantial attenuation of electromagnetic interference.

Abstract: A microwave power combiner includes a first plate having disposed in a first surface thereof a first plurality of grooves and a second plate having disposed in a first surface of said second plate a second plurality of grooves, with said second plate being mated to said first plate and with said first plurality of grooves in the first plate disposed in alignment with the second plurality of grooves in the second plate to provide a plurality of waveguide regions. The waveguide regions are further disposed to provide a plurality of hybrid Ts preferably matched hybrid Ts or magic Ts which are selectively interconnected to form an integrated combiner structure. A first surface of the plate is used to mount a plurality of IMPATT diode modules whereas the second opposite surface of the composite plate is used to mount a heat sink thereby providing a thermal path between the diode modules through the composite plates to the heat sink.

Abstract: A hermetically sealed radio frequency feedthrough device is disclosed. The feedthrough includes a first ring of a glass material which bonds to a radio frequency device housing when heated. A second ring is also provided, the second ring does not melt and thereby contains the glass material to desired areas during heating.

Abstract: An electron-wave coupled semiconductor device, in particular a semiconductor switching device, comprises a first layer of semiconducting material having a first bandgap, and a second layer of material formed on said first semiconducting layer and having a second bandgap greater than the first said bandgap. First and second electron waveguides are formed alongside but spaced apart from each other in the first semiconductor layer adjacent the boundary between this layer and said second layer. A gate region extends over said second layer transverse to and over said electron waveguides. First contact means provides input connections to said first and second electron waveguides on one side of said gate region and further contact means provides separate output connections from said first and second electron waveguides on the opposite side of the gate region from said first contact means.

Abstract: A noncontacting waveguide backshort is provided for use with frequencies of interest between 1 and 1000 GHz including a relatively rugged metallic bar movably mounted within the waveguide in a MYLAR insulator. A series of regularly shaped and spaced circular or rectangular openings are made in the metallic bar to form sections of high impedance alternating with sections of the bar having low impedance. This creates a periodic impedance variation which serves to provided an adjustable short circuit in a waveguide for the frequencies of interest.

Abstract: The invention relates to matching asymmetrical discontinuities in transmission lines to give low reflection coefficients (less than five percent) over a wide frequency band (corresponding to at least an octave in wavelength). A group of asymmetrical discontinuities, such as impedance steps in a waveguide, are matched by considering a reference plane whose position varies with frequency at which the reflection coefficient for waves transmitted in one direction is equal to that for waves transmitted in the opposite direction. Matching elements are then provided which have a reflection coefficient at the reference plane which is equal and opposite to the reflection coefficient of the discontinuities. Matching is less difficult if the distance between the steps is less than a quarter of a guide wavelength at all frequencies in the wide band mentioned above and such an arrangement is a "reduced quarter wave transformer".

Abstract: A system for transmitting broadband data signals between a mobile element and a fixed control station utilizes a fixed hollow tube forming a fixed waveguide for microwaves provided with a continuous longitudinal center slot and a movable hollow tube carrying the moving element and forming a moving waveguide for microwaves. The movable hollow tube has a longitudinal axis which forms an angle with the longitudinal axis of the fixed hollow tube and is equipped with an electric antenna penetrating into the center slot of the fixed hollow tube and coupled to the movable hollow tube via a coaxial cable-to-waveguide transition. The movable hollow tube is also provided with an elongated center slot parallel to its longitudinal axis and cooperates with a transmit and/or receive antenna for transmitting the microwave radiation to the mobile element linked thereby with the fixed control station.

Abstract: A housing (100), that is suitable for use in a automated manufacturing and/or testing environment, is constructed and arranged to substantially enclose and shield a trimmable electrical circuit (107) from radio frequency interference external to the housing (100). At least a portion of the housing (100) is constructed and arranged to shield while contemporaneously allowing a laser beam (114) to pass therethrough so as to focus on at least a portion of the trimmable electrical circuit (107) and thereby laser trim the trimmable electrical circuit (107).

Abstract: First and second aluminum members are joined by the steps of(a) dissolving and removing completely the aluminum oxide layer from the surface of each of the first and second members to be joined and replacing each of the aluminum oxide layers with a layer consisting essentially of zinc;(b) plating at least one of the zinc layers with a non-alloy cadmium;(c) assembling and retaining together the first and second aluminum members so that the surfaces to be joined are held in contact with one another and placing the aluminum members in a vacuum; and(d) heating the members while in the vacuum thereby forming a bond between the first and second aluminum members.

Abstract: A waveguide is provided which can include a bearing supporting a probe or other equipment for rotation. In order to prevent particles of the waveguide metal or waveguide cleaning materials embedded in the metal from entering the bearing, a window is fitted across the waveguide at a selected position between two waveguide sections or at each of a number of positions, the window being transparent to microwave transmission, being capable of transmitting pressure and being capable of filtering particles of a diameter in excess in 0.005 inch (0.013 cm).

Abstract: The apparatus comprises a waveguide having one end with an outside rim in the form of a test flange having a plane front surface defining a calibration plane and intended to be applied against a plane surface of a sample of material to be tested, a generator coupled to the waveguide to inject microwaves therein, and means for detecting the waves reflected by the material. At least the terminal portion of the waveguide including the test flange for application against the material to be tested at very high temperature is made of an electrically conductive refractory composite material, such as a carbon/carbon or a carbon/ceramic composite material.

Abstract: The microwave transmission between wave guide regions (a, b) having different internal gas pressures and/or different fill-gas compositions, that is to say, the coupling or outcoupling of microwaves of such a wave guide region into another region is improved in that between the wave guide regions at least a single pumping stage (6, 7, 8, 9) is inserted. The wave guide (1) is connected to the pumping stages preferably via the slots (2, 3, 4, 5) which do not virtually outcouple the microwave power.

Abstract: A hollow waveguide (1) for electromagnetic microwaves supports an adaptation chamber (2) on one side thereof. The chamber includes a frame structure (7) and a cover member (8) and is provided with an adapter line (11). The hollow waveguide is a ridge waveguide having a longitudinally extending ridge (4). The chamber (2) is connected electrically to an outer conductor (18) of a coaxial line (3), through which the arrangement is supplied with power with an electromagnetic microwave (S). One end (12) of the adapter line (11) is connected electrically to the adaptation chamber (2), whereas the other end (16) is connected electrically to a centre conductor (17) of the coaxial line (3). The ridge waveguide (1) is supplied with power from the adaptation chamber (2) through a transverse slot (19) and emits microwaves to the surroundings through longitudinally extending slots (6).

Abstract: A microwave filter is composed of a set of circular cylindrical cavities arranged in cascade array and interconnected by irises having cross-slotted apertures for coupling electromagnetic power in two orthogonal TE.sub.113 modes. An input port is formed in a first of the cavities and an output port is formed in a last of the cavities. Each port is constructed as a transition between a section of rectangular waveguide and a section of circular waveguide, the section of circular waveguide being a portion of the first cavity and the last cavity, respectively, in the input and the output ports. The cross-sectional aspect ratio of the rectangular waveguide is 2:1. The ratio of a diameter of the cavity to length, as measured along a cylindrical axis in each cavity, is 0.26 thereby to provide for increased bandwidth while minimizing dispersion and transmission loss.

Abstract: A waveguide low pass filter is composed of an assembly of an outer waveguide, an inner waveguide shorter in length than the outer waveguide, and a printed circuit filter substrate. The outer and inner waveguides have split block constructions. The inner waveguide is mounted within the outer waveguide so as to form a constriction within the outer waveguide limiting propagation of energy within the outer waveguide to the fundamental TE.sub.10 waveguide mode. The printed circuit filter substrate is mounted to extend longitudinally between the assembled split halves of the respective outer and inner waveguides, and is constructed of a substantially planar dielectric substrate element and upper and lower conductive plate elements on the substrate and lying in the plane thereof. The conductive plate elements define a tapered dual ridge transformer section. The lower plate element has longitudinally spaced vertical slots formed therein defining an open stub slotted filter array.

Abstract: A waveguide bandpass filter employs a waveguide section and a printed cirt filter assembly having a dielectric substrate positioned in the waveguide between the narrow walls thereof and a row or array of half-wavelength conductive metal plate elements lying in a surface plane of the dielectric substrate that is oriented substantially parallel to narrow walls and orthogonal to broad walls of the waveguide. The half-wavelength conductive metal plate elements, defining a parallel resonant array, are spaced in non-conductive relation from one another and from the broad and narrow walls of the waveguide so as to divide and transform a dominant waveguide propagation mode into a transformed propagation mode that approximates upper and lower microstrip sections interconnected by a metallic conductor.

Abstract: A method of creating an access to a waveguide arrangement in order to couple measuring signals into and/or out of the waveguide arrangement includes providing a cover for covering an opening in a waveguide wall of the waveguide arrangement at a location suitable as a measuring signal access, removing the cover, and replacing the cover with another cover equipped with a coupling device.

Abstract: The converter disclosed is interposed between a generator of electromagnetic waves and circular, output waveguide propagating the TE.sub.01 mode. It is formed by the series mounting of a rectangular waveguide, having one of its end closed and a circular waveguide propagating the TM.sub.01 mode, connected to the rectangular waveguide by a lateral opening, in such a way that the axes of the two waveguides are perpendiuclar, also included in the series mounting is a group of intermediate waveguides placed after the circular waveguide, distributed in a ring before its free end. Each intermediate waveguide is formed by a sequence of waveguide pieces working in the rectangular TE.sub.10 mode and gradually offset in rotation with respect to one another, in the same direction. The overall offset among the pieces of one and the same intermediate guide will be 90.degree.. The converter can be applied to the conversion of modes in high power microwave transmission circuits.

Abstract: Waveguide apparatus in which a dielectric substrate is placed between sections of a waveguide. The dielectric substrate incorporates slots arranged in a linear fashion and having extended portions, there being a narrow gap between adjacent slots. This enables accurate control of radiation losses through the dielectric layer sandwiched between the sections of the waveguide to be achieved.

Abstract: A microwave transmission line is provided including a class of dielectric terials known as relaxor dielectrics having very high dielectric constants of greater than 1000, low dielectric loss and large variations of the real part of the dielectric constant with varying temperature. The phase of a microwave signal passed through such a transmission line is modulated by subjecting the transmission line to light that is absorbed in the dielectric layer causing a variation in the dielectric constant and a change in the velocity of the continuous microwave signal passing through the transmission line.

Abstract: A process for joining first and second aluminum sheets in which the bonding surfaces of the aluminum sheets have their aluminum oxide layer replaced by a zinc layer and the zinc layers are plated with a non-alloy metal bonding material such as cadmium. The first and second aluminum sheets are then assembled and fastened together with an engaging means for holding the sheets together, and then the assembled sheets are placed in a vacuum. The sheets are subsequently heated in the vacuum thereby creating a bond of cadmium between them, removed from the vacuum, and then passivated.

Abstract: Disclosed is a device to combine or divide the power values of electromagnetic signals and, more particularly, a device of the radial mode. In a combiner/divider which comprises two metallic disks defining an annular space of propagation, each channel is separated from the adjacent channel by a radial slot which is placed in the lower disk and extends from the central aperture to the peripheral ring. Furthermore, each channel thus defined has a radial ridge. The invention can be applied to transmitters, notably those used in radars.

Abstract: According to the invention, the conducting collector wall (23) on which the electrons are collected is surrounded by a coil winding (36) which is supplied with a periodically varying current, creating a slightly divergent axial magnetic field whose amplitude is periodically variable with time. The electron trajectories strike the collector wall at a grazing, nearly tangential angle, broadening the zone of impact, and the zone of impact is swept back and forth along the length of the collector, further spreading the power to be dissipated on a greater surface of the collector. Application to realization of very high power tubes or moderate power tubes with reduced collector dimensions.

Abstract: A wide band large dynamic range current sensor operable to measure current leakage in an external conductor utilizing a magnetostatic spin wave delay line (MSW) device is described. The measurable changes in well known electromagnetic properties of ferrite films, as utilized in MSW devices when these films are exposed to external current induced magnetic fields, results in a current sensitive detection device. A method of current detection using this device is also described. Specific, low power microelectronic applications as well as, high power, local and remote current detecting embodiments are included.

Abstract: A fabricated dielectric aperture assembly includes a first layer of electrically conductive material having an opening therethrough to define a first aperture, a second layer of electrically conductive material spaced from the first electrically conductive layer and having an opening therethrough to define a second aperture and a plurality of solid dielectric layers interposed between the first and second layers of electrically conductive material. The first and second layers of electrically conductive material with the multiple layers of dielectric material interposed therebetween form a generally laminar assembly. A grid-like structure is embedded in the laminar assembly and extends between the first and second electrically conductive layers. The grid-like structure has an inner wall, an outer wall portion, an interior bounded by the inner wall and a plurality of openings extending from the inner wall to the outer wall.

Abstract: A waveguide termination includes a rectangular waveguide having a pair of spaced-apart broad walls and a pair of narrow walls equally spaced from a plane of symmetry. The termination has a block or wedige of absorber material. The width of the absorber material is approximately half the width of the waveguide as measured between the narrow walls. The absorber material is located asymmetrically in the waveguide so that substantially all of the absorber material is on one side of the plane of symmetry.

Abstract: Arrays of printed circuit elements are placed in the E-plane inside waveges to reflect and pass selected bands of frequencies. The elements make no contact with the guide walls but are suspended on dielectric substrates and are held in place with foam dielectric.

Abstract: An integrated semiconductor arrangement of the coupling type between a photodetector D and a light wave guide G.sub.1, operating in a band of given wavelengths, containing on the surface of a semiconductor substrate S of a III-V compound one after the other a confining layer C.sub.0 of III-V compound and a transparent layer C.sub.1 of a III-V compound for the operating wavelengths having an index superior to that of the confining layer, the light waveguide G.sub.1 being realized in layer C.sub.1, and also containing an absorbing layer C.sub.3 of a III-V compound for the operating wavelengths having an index superior to that of the waveguide, in which layer C.sub.3 the photodetector is realized, characterized in that the absorbing layer C.sub.3 is deposited on top of the transparent layer C.sub.1 such that the photodetector is formed on the surface of the light wave guide G.sub.1 and coupled to the latter in parallel with its axis over a given coupling length L.sub.

Abstract: A nearly square waveguide below cutoff has a microstrip substrate disposed diagonally therein. A first shunt capacitance is provided by either a conductor formed on the microstrip substrate or a conductor disposed in the waveguide perpendicular to the microstrip substrate. A dielectric window is disposed in the end to provide a shunt capacitance at the opposite end of the waveguide.

Abstract: A waveguide filter (100) is provided for functioning as a cable feed-through for previously terminated cables (50). Waveguide filter feed-through (100) includes a housing (110) of predetermined length having a plurality of bores (130, 140) extending therethrough. One of the bores (140) being centrally located, with each of the other bores (130) being located radially about the central bore (140). Each of the radially located bores (130) form an individual waveguide when a plug (120) is inserted within the central bore (140). Each of the waveguide passages (130) include a longitudinal passage extending the full length of housing (110) and opening into the central bore (140).

Abstract: A transmission line comprising a multi-layer dielectric slab structure including: a dielectric substrate layer (30) having a thickness d.sub.s and permittivity .epsilon..sub.s ; a conductive ground plane (31) on the bottom surface of the dielectric substrate layer (30); a dielectric guiding layer (32) having a thickness h and permittivity .epsilon..sub.g, where .epsilon..sub.g >.epsilon..sub.s, attached to the top surface of dielectric substrate layer (30); at least one elongated and relatively narrow dielectric loading strip layer (33) having a width W, thickness d.sub.1, and permittivity .epsilon..sub.1, where .epsilon..sub.g >.epsilon..sub.1, attached to the top surface of the dielectric guiding layer (32); and a conductive coating (34) on the top surface of the dielectric loading strip layer (32). Such a structure permits single mode propagation over a relatively wide frequency band.

Abstract: A microwave device including a half wave plate for a microwave power combiner, attenuator or variable coupler divider having a circular waveguide portion and a pair of cavities disposed opposite to one another and each coupled to a plurality of slots formed in a wall between said cavities and said circular waveguide. The half wave plate is used to obtain a phase shift in the signals provided to one end of the circular waveguide and is preferably mounted for rotary motion about the center axis of the circular waveguide.

Abstract: A monolithically integrated waveguide-photodiode combination for optical communications systems includes a carrier substrate of n-conductive semiconductor material, a further layer of the same material in whose surface is formed a strip-shaped n-conductive absorption layer, and of a waveguide formed thereon. A p-doping is diffused into the waveguide through the n-conductive absorption layer and a photodiode is thereby formed. A contact for the positive electrode of the photodiode is applied over the p-conductive region and the contact for the negative electrode is applied to the free side of the carrier substrate. The waveguide is covered by a cover layer along its top surface.

Abstract: A duplexer for use in a feed network for a satellite communications antenna is made in waveguide form and comprises two plate halves each with a pattern of channels on one surface, the pattern on one half being the mirror image of the pattern on the other. When the two halves are assembled with the patterned faces juxtaposed, a receive filter and a transmit filter with receive, transmit and common ports are obtained. Each filter has a main waveguide and several short-circuited half wavelength stubs in serial connection to the main waveguide. The joint between the two halves bisects the waveguide broadwall and is, therefore, of no electrical significance. The simplicity of the design lends itself to fabrication as part of a bigger integral assembly consisting of duplexers and other feed components. After manufacture, no further tuning is necessary.

Abstract: A device for absorbing resonances in a large circular cavity such as a microwave rotary joint that utilizes a horizontally positioned resonance absorber positioned in the balun cavity to absorb the resonances or undesired modes. The resonance absorber forms a folded slot with a resistor across its arms to interrupt the circumferential flow of current in the rim of the cavity without affecting the normal desired mode.