Abstract: A compact, dual series waveguide feed network is disclosed which has application to monopulse radar antennas and is usable in applications requiring compact and light weight feed networks. The network in accordance with the invention uses phase shifters at the phase reversal points of the secondary (42) feed lines to establish a 180.degree. relative phase difference with the corresponding phase reversal point of the primary feed line. No phase shifters are used in the crossguide feed lines (44). Because of the invention's phase shifter arrangement, crossguide lines (44) may be located directly opposite each other instead of being staggered as in prior techniques; hence the size of the network is reduced and resolution is increased. Also, the primary and secondary feed lines may be located closer together because there are no phase shifters with associated matching and transition devices located in the crossguide feed lines.

Abstract: A polarizer for connection to a first and a second wave guide includes a feed tube and the first wave guide connected laterally to the feed tube whereby a long dimension of the wave guide extends in the direction of the axis of the feed tube. A short circuiting element is disposed in the feed tube between the connection of the first wave guide and one end of the feed tube. The second wave guide extends parallel to the first one and is laterally connected with a wide side to that one end of the feed tube, closing the same. The wide dimensions of the two wave guides are turned by 90.degree.. The second wave guide is short circuited at its end, and a trimming pin is disposed on the second wave guide in axial alignment with the axis of the tube. The other end of the feed tube is connected to a single wave guide. The wave guides may have rectangular or elliptical cross section.

Abstract: A dual mode circularly polarized horn radiator is useful in the testing of radiation apparatus in an anechoic chamber. The horn has a buffered radiating aperture which permits a plurality of the horns to be arranged in an array with minimal mutual coupling between the horns. The radiating aperture is located at an end of a conic section, of low flare angle, and has a diameter of one free-space wavelength of the radiation to be radiated from or received at the horn. This permits use of the horn for measurement of near field radiation pattern of apparatus under test. The horn includes an orthomode tee having mutually perpendicular rectangular waveguides extending therefrom, and being coupled thereby to a circular port. A polarizer connects the circular port of the tee to the conic section, and includes two sets of diametrically opposed pins for conversion of both right-hand and left-hand circular polarizations to linearly polarized radiation.

Abstract: A reduced size waveguide directional coupler assembly includes a first rectangular waveguide which is adapted to receive signal at an input port. A conductive septum parallel with a broad wall of the rectangular waveguide divides the signal into two portions flowing in first and second channels within the first waveguide. The septum may be centered between the broad walls, in which case the two signal portions and channel dimensions are the same, or the septum may be off-center, resulting in dissimilar amplitudes of the two signal portions. The coupler also includes a second waveguide. Branch waveguides or other coupling apertures open from the first channel into the second waveguide. That energy not flowing to the second waveguide from the first channel may be routed to an independent output port, or may be recombined with the energy flowing in the second channel and routed to a combined output port.

Abstract: A filter system is composed of two identical filters coupled between an input waveguide and an output waveguide to provide a 4-port directional filter characteristic operable with quasi-elliptic linear modes of electromagnetic propagation within each of the filters. Each of the filters may be constructed of a plurality of cavities arranged serially, one behind the other, with one of the cavities in each of the filters being employed for coupling electromagnetic power between the two waveguides. The coupling is accomplished by use of a transverse slot and a longitudinal slot in each of the waveguides, the slots extending through sidewalls of the waveguides into walls of the cavity in each of the filters for symmetric and antisymmetric coupling, respectively, of longitudinal and transverse components of a transverse electric wave in each of the waveguides.

Abstract: An antenna exciter for two different frequency bands which consists of two polarization switches (3, 4) arranged axially one behind the other and of a feed horn (5). The polarization switches (3, 4) are circular tubes of different inside diameters, the diameters being the same over the entire length. To each polarization switch (3, 4) there can be connected, spaced axially from each other, two wave guides (6, 7, 8, 9) 90.degree. apart from each other. Opposite the wave guide (9) adjacent the feed horn (5) a stop closed by a short-circuit plate (12) is arranged in the corresponding polarization switch (4). Between the feed horn (5) and the adjacent wave guide (9) and between the points of connection of the two wave guides (8, 9) of the larger polarization switch (4), two axially extending webs lying diametrically opposite each other and of a predetermined dimension are arranged therein.

Abstract: The invention relates to a rotary microwave joint device comprising a main circular waveguide constituted by two portions (10, 11) situated as extensions to each other and rotatable relative to one another about their axis of symmetry, each of said two portions (10, 11) being provided with at least one access which is orthogonal thereto, and mechanical means enabling a circularly polarized wave to be obtained in the main waveguide. The invention is applicable to space telecommunications.

Abstract: A device is provided for adding to signals of the same frequency but of any phases and amplitudes. The device has two inputs and two outputs. The outputs each deliver a combination of the signals fed to the input. In a particular application, corresponding to reinjection of a recovery signal from a linear accelerator, the combination is an addition. At a first output of the device the whole of the added signal is recovered for reinjection, at a second output of the device the signal is zero. The efficiency of the device is total.

Abstract: A variable microwave power divider which includes an orthomode transducer having a first section capable of supporting a vertically polarized wave and a second section capable of supporting two orthogonal linearly polarized waves. Suitable probes for inserting or extracting RF energy are coupled to each section. A similar orthomode transducer is connected to the first transducer through a circular hollow waveguide with the transducers being angularly offset from one another a predetermined angular amount. A septum is positioned within the waveguide which is fixed thereto at one end with the other end being controlled to a predetermined spiral configuration in order to direct RF energy flowing through the waveguide to the sections of one transducer in a determinable manner.

Abstract: Inside a parallelepipedic guide section there is provided at least one partition located so as to divide the inner volume of the guide section into a main waveguide portion capable of supporting an orthogonally polarized signal and two secondary waveguide portions extending in the same direction as the main waveguide portion. The secondary waveguide portions are so dimensioned such that one of these waveguide portions is capable of supporting a horizontally polarized signal and that the second waveguide portion is capable of supporting a vertically polarized signal.

Abstract: A coupler for extracting energy in the TE.sub.21 mode from a circular waveguide propagating energy in both the TE.sub.11 and TE.sub.21 modes, characterized in that an annular iris on the inner circumference of the waveguide and a longitudinally stepped transition portion of the waveguide define therebetween a TE.sub.21 mode resonant cavity which is coupled via a narrow axially extending rectangular slot contained in the wall portion of the waveguide which defines the cavity. At least one external resonant chamber may be provided on the waveguide through which the TE.sub.21 mode energy is extracted and transmitted to a detector thereof via the slot, which chamber cooperates with the resonant cavity to define a multiple resonant filter for improving the matching to the TE.sub.21 mode while reducing the perturbation to the TE.sub.11 mode.

Abstract: A launcher of cross-polarized electromagnetic radiation is provided with increased bandwidth by inserting a set of axially directed ridges on the interior surfaces of waveguide walls of the launcher for concentrating electric fields of radiations of the different polarizations. A first radiation radiated by a probe in a back section of the launcher waveguide propagates forward into a front section of the launcher waveguide. A second radiation is radiated into the front section by a probe therein, there being a vane disposed in the front section for inhibiting the propagation of the second radiation into the back section. The front section is flared to provide a larger exit aperture at a front end of the front section. A second and a fourth of the ridges are tapered towards the back section to permit a smooth transition in the propagation of the first radiation into the front section.

Abstract: A suspension and drive system for a mechanical microwave power divider for spacecraft applications. The mechanical power divider includes a control which extends longitudinally therethrough. Torsion springs connect each end of the control rod to fixed surfaces and an electromagnetic control is coupled to the control rod to rotate it to a predetermined angular position. A selectively energizeable friction brake surrounds at least a portion of the control rod for holding it in a predetermined angular position.

Abstract: In a waveguide structure, there is provided a waveguide section rotatable about its longitudinal axis and an electric DC stepper motor arrangement. The rotor of such an arrangement is constituted by magnetic returns fixedly mounted on the waveguide section, and has a rotation axis which coincides with the longitudinal axis of the section. The rotor is therefore rotatable with the waveguide section about the longitudinal axis of the same. The motor arrangement further includes a stator provided with a plurality of poles which cooperate with the magnetic returns to rotate the waveguide section so as to adjust as desired its angular position. When the waveguide section has a circular cross section and is provided with two diametrically opposed lines of tuning screws, the waveguide structure forms a microwave polarizer which can be used in a variable power combiner.

Abstract: This invention relates to two embodiments of microwave polarization control networks. The first produces two sets of orthogonal linear polarizations and constitutes a two position transfer switch and a directional coupler having two ports alternating as input and isolated ports and two ports alternating as through and coupled output ports. The transfer switch is connected to switch an input to one or the other of the two ports alternating as input and isolated ports and couple the other to a termination. An ortho-mode transducer junction, having two input ports, has one input port coupled directly to one of the output ports of the directional coupler and the other input port connected in series through a 0.degree./180.degree. phase shifter to the other output port of the directional coupler. A dual mode waveguide is employed for transmitting a variable polarization output from the ortho-mode junction. In another embodiment, the transfer switch is not employed, and a 90.degree.

Abstract: For high power application of overmoded waveguide, air cooling is provided by applying air flow to the overmoded waveguide either directly or indirectly, through an air inlet which does not significantly disturb the internal electromagnetic fields.

Abstract: A cavity resonator coupling type power distributor/power combiner can be used as a distributing amplifier or a combining unit. A first cavity resonator, having a single coupling terminal, and a second cavity resonator having a plurality of coupling terminals, are coupled by a coupling window or a coupling rod. As a result, a wide bandwidth of microwave electric power can be distributed or combined.

Abstract: A waveguide power combiner or splitter (divider) includes a common waveguide having an axis skewed relative to the axes of a line array waveguides. A sectoral parabolic reflector is oriented with its focus at a port of the common waveguide with its axis parallel with the axes of the waveguides of the array for reflecting signals from the focal point to create a locus of constant phase at the ports of the waveguide array, whereby signal power originating at the common waveguide is divided equally among the waveguides of the waveguide array. A waveguide power amplifier includes a power splitter as described above, and an amplifier module located in each waveguide of the waveguide array to amplify the power therein to produce amplified signal in an output waveguide array. The amplified signals from the amplifier modules are combined by a second reflector driven by the output waveguide array and reflected to a common output port.

Abstract: A compact waveguide power combiner/divider is characterized by low reflection and dissipation losses. The device includes a radial waveguide having an inlet opening and a plurality of radial outlet openings, and a coupling pin is arranged in the radial waveguide to couple energy from the inlet opening with the radial waveguide. A mode suppression device is connected with the radial waveguide and contains a plurality of radially arranged slots corresponding with the outlet openings. A tuning mechanism arranged within the radial waveguide optimizes the coupling of undesired modes with the slots. An undesired mode absorption device is arranged in cooperation with the slots of the mode suppression device so that undesired modes are isolated from desired modes with low reflection and dissipation losses.

Abstract: A matched lossless reciprocal five-port junction can be constructed as a tapered five-fold symmetric star. The dimensions of the leads are tapered in toward the center, such that the cutoff frequency is the upper band frequency divided by 1.66.

Abstract: A method and device for transducing multiple rectangular TE.sub.10 modes to circular TE.sub.01 mode. Multiple TE.sub.10 modes are transitioned into an intermediate mode which is transitioned into a circular TE.sub.01 mode and vice versa. Unique pyramidal structure provides overmoded high power operation without cooling and/or pressurization.

Abstract: A generally fan shaped electrically conducting base member defining a waveguide cavity with a waveguide input/output in communication with the cavity at the apex thereof and a plurality of output/input waveguides in communication with the cavity equal angularly spaced along the arc of the base member. The inputs and outputs are formed in the plane of the cavity so that losses are substantially reduced and all of the output/input waveguides are equally spaced along radii of the base member and are of equal length so that signals at the outlets thereof are of equal amplitude and phase without requiring phase shifters and the like.

Abstract: A device for distributing and combining microwave electric power which is used, for example, in a high power microwave amplifier and combines or distributes microwave electric power between a first microwave path such as a standard waveguide and a plurality of second microwave paths such as a plurality of waveguides or MIC transmission lines. The device comprises a horn whose throat portion is coupled to the first microwave path, a oversized waveguide coupled to the opening portion of the horn at one end and coupled to the plurality of the second microwave paths, and, for example, a dielectric lens, or one or more reflectors, for uniformalizing the phases of the microwave signals distributed by the horn or for adjusting the phases of the microwave signals output from the second microwave paths.

Abstract: The configuration of a waveguide antenna feed is determined by a shaped body of solid dielectric material which is coated with a conductive material. The conductive material functions as a waveguide wall for constraining electromagnetic wave propagation within the dielectric body. The body includes a mode converter and a coupler to a lead-in structure. A polarization converter, if desired, can be integral with the dielectric body.

Abstract: A microwave coupler for coupling microwave energy from a first waveguide to a second waveguide disposed side by side along a propagation length includes a common coupling means, and specifically, orifices along the propagation length wherein the coupling orifices are sized to promote coupling of a favored field mode of electromagnetic energy according to a Bessel function distribution of energy along the length of the waveguide. The Bessel function distribution provides for wideband, low-loss coupling of the favored field mode and maximal isolation from non-favored field modes. The invention is particularly useful for extracting a type TE.sub.21 circular mode signal from a signal containing TE.sub.11 and TE.sub.21 circular modes wherein the TE.sub.21 mode signals are used for generating elevational and azimuthal tracking signals.

Abstract: A phase-shifter apparatus which imposes a desired phase shift on an electromagnetic wave traveling through a waveguide, and divides the power in an output waveguide into two parts. The phase shifter apparatus includes a quarter-wave plate for changing the polarization of the linearly polarized wave to a circularly polarized wave, a rod of ferromagnetic material with a magnetic field for imposing a desired phase shift on the circularly polarized wave traveling through the rod, a quarter-wave plate for converting the circularly polarized wave to a linearly polarized wave, and a septum polarizer in the output wave guide for dividing the power. The output waveguide has the power divided between two ports, and independent phase shifts are imposed on the electromagnetic waves of each port.

Abstract: A cavity resonator coupling-type power distributor/power combiner includes a first cavity resonator operatively resonating with a cylindrical T.sub.O,n,O mode, and a plurality of second cavity resonators arranged on the periphery of the first cavity resonator and extending radially and symmetrically with respect to the first cavity resonator. The second cavity resonators each have the same shape and size so that magnetic-field coupling is established between the first cavity resonator and each of the second cavity resonators, for distributing or combining microwave power in a microwave amplifier.

Abstract: A frequency multiplier for electromagnetic waves in which multiples of the input frequency propagate, while the input frequency evanesces. A rectangular waveguide or other suitable wave conveying element with a cut-off frequency above the input frequency but below the output frequency contains the multiplying structure. The input frequency is multiplied using a post located in the waveguide or other element adjacent to the source of input waves. The post may define a multiplier gap between one of its surfaces and a wall of the waveguide or other element, in which case the multiplier gap may contain a multipactor between its surfaces which generates multiples of the input frequency. The multiplier gap may alternatively contain a non-linear element responsive to a high electric field, such as a ferroelectric material, which also generates multiples of the input frequency. Alternatively, the post may be surrounded by a non-linear element of ferromagnetic material responsive to a strong magnetic field.

Abstract: A circuit component for separating and/or combining two pairs of high-frequency signal waves lying in different frequency bands, the waves of each pair having the same frequency but mutually orthogonal planes of polarization, comprises two mutually identical and aligned 3dB couplers bracketing a filtering assembly between them. Each 3dB coupler has a central guide of square cross-section surrounded by four collateral guides, each connected with the central guide by a coupling guide letting only the waves polarized in one plane--regardless of frequency--pass therebetween. The filtering assembly has sets of baffles in line with the central and collateral guides of both couplers, these baffles defining slots giving passage to only the waves of one of the two bands while reflecting the others.

Abstract: A system is disclosed for coupling orthogonal polarized microwave signals from a reflector to signal processing circuits. The system includes successively a horn, a bandpass filter, a polarizer, a mode separator, and a housing for containing the circuits. The system is constructed from two half-shells. The horn, bandpass filter and polarizer form a waveguide portion which is coupled to the circuits by the mode separator.

Abstract: A waveguide structure carrying microwaves with two mutually orthogonal planes of polarization and in two different frequency bands, transmitted and received by an associated antenna, comprises two orthomode transducers in the form of coaxial cylindrical guide members of different inner diameters, the smaller-diameter transducer terminating in a short-circuiting end wall while the larger-diameter transducer, adjoining same at an annular shoulder, extends to a feed horn confronting a reflector. Each transducer is formed with two elongate peripheral access slots, opening onto respective rectangular-section branches, which are longitudinally bisected by mutually perpendicular axial planes while being relatively offset in axial direction.

Abstract: A variable ratio power combiner employs, as its major coupling component, one or more septum polarizers and associated 90.degree. differential phase shifters or quarter waveplates in place of conventional OMTs. Advantageously, a septum polarizer is a relatively simple component that serves the same function as an OMT and polarizer combination. Because it has an essentially T-shaped configuration, it can bring a pair of waveguide arms together in the same plane back-to-back, so that the resulting power combiner may provide the desired symmetrical coupling. Normally the variable ratio power combiner requires only symmetrical inputs for the sources and not both symmetrical inputs and outputs, so that only a single septum polarizer and associated quarter waveplate are employed, with an OMT used for the output. For a completely symmetrical configuration, however, the other OMT may be replaced by a separate septum polarizer/rotatable quarter waveplate arrangement.

Abstract: A crossed waveguide type polarization separator comprises a crossed waveguide for propagating orthogonal linear polarized waves, at least one conductor septum fitted in the crossed waveguide to totally reflect only one polarized wave in the linear polarized waves, at least one subwaveguide for receiving one linear polarized wave formed by the total reflection of the conductor septum, and a waveguide for receiving the other linear polarized wave which is not reflected by the conductor septum.

Abstract: A microwave transmission system for multipath propagation operating according to the angle diversity principle and comprising a transmitting and receiving device including a reflector antenna and a waveguide exciter horn wherein a fundamental mode and modes of a higher order can propagate, a mode coupler following the exciter horn for separating the energy components of the main mode and the higher order modes, and receiving and combining devices for obtaining the best signal from the received energy components of the various modes. The exciter horn is dimensioned so that at least two independent modes of a higher order or combinations thereof having the same polarization as the main mode can be excited in the waveguide exciter horn in addition to the main mode.

Abstract: The present invention provides an apparatus for the simultaneous application of pressure and microwaves to a curable assembly, comprising (1) a continuous press including two endless press belts forming a nip region, the press belts being disposed to apply pressure to curable assemblies inserted therebetween, and including an inlet and an outlet for the passage of curable assemblies, (2) a press chamber defined by the two substantially parallel belt surfaces in the nip region and by two side walls, (3) means to apply microwaves to the curable assemblies from at least one microwave generator through a waveguide forming an interface with the press chamber located in an opening in a side wall, and (4) dam means at the interface between the waveguide and the press chamber to withstand the lateral pressure exerted thereon by curable assemblies being pressed, and which effectively permits propagation of microwaves into the press chamber.

Abstract: a tri-mode coupler (80) for developing from a received signal including three waveguide propagation modes the three tracking signals (i.e. sum signal, elevation signal, and azimuth signal) used in a high-frequency monopulse tracking system and for transmitting a signal at a different frequency, the coupler comprises broadband means such as a two-arm turnstile junction (84) coupling a first circular waveguide section (82) to an E-plane folded hybrid junction (90) for separating out one waveguide mode of the received signal and receiving the signal to be transmitted, and a second circular waveguide section (86) of smaller diameter than the first waveguide section and coupling the latter section to an additional E-plane folded hybrid junction (88) for separating out the two additional waveguide modes of the received signal.

Abstract: A microwave apparatus comprises a waveguide section including a stepped septum. The septum is positioned so as to divide the waveguide into two channels. The steps comprise a plurality of first steps which advance progressively in one direction and at least one second step, or the equivalent, which follows the first steps and which returns in an opposite direction. The invention is intended to enable the production of a circularly polarized microwave signal without requiring the use of phase adjustment techniques.

Abstract: The invention provides a mode coupler arrangement comprising a main waveguide coupled via arrays of slots to two sets of subsidiary waveguides over a common length. One set of subsidiary waveguides is such as to support one mode of propagation and the other set another mode of propagation. In a preferred embodiment the slots in one set of subsidiary guides are staggered by (1.lambda./4) relative to the slots in the other set of subsidiary guides and the guides of one set are longer than the guides of the other set.For TE11 communications mode signals, the two sets of subsidiary guides are of different frequency, with each subsidiary guide arranged such that its variation of wavelength with frequency coincides with that of the main waveguide only in the frequency band for which that subsidiary guide is provided.

Abstract: A millimeter wave transmitting and receiving head having an excellent technical quality, which is inexpensive to produce and has minimum overall dimensions. The head has for example a guide with a square cross-section connected by a duplexer provided with fins to two guides having rectangular cross-sections and with crossed polarizations. One of the rectangular guides is semicircular so that it can receive through an opening an orifice of the other rectangular guide. A symmetrical mixer having two diodes receives the signal from the two guides and has two outputs. A Gunn diode-type or avalanche-type oscillator serves as the transmitter and the local signal generator. The head is completed by a receiving amplifier and an antenna for constituting a transmitter-receiver. A radar can be obtained by addition of a quarter-wave plate level with antenna.

Abstract: A novel arrangement to achieve high power amplification of a microwave signal by summing the contributions of many small power amplifiers. This arrangement comprises the equivalent of a divider network to distribute an incoming signal to an arbitrary number of small power amplifiers, and a combiner to sum the outputs of all amplifiers into a single output. This arrangement combines the series-fed circuit concept with a dual mode transmission media (a transmission line capable of transmitting two independent orthogonal modes, for example, the circular waveguide TE.sub.11 mode) for the divider and combiner.

Abstract: A polarization separator or diplexer for ultra-high frequencies utilizing waveguide sections of rectangular and/or round cross-section in which the signals passing through are phase synchronized over a particular frequency range and which can be manufactured very inexpensively and is operable over a broad frequency band and wherein the arms of the series branching waveguides and the E and H offset portions have a ratio of the narrow to wide sides of at least 1:4 and the first portion of the double branching for providing a connection and transition to the coaxial waveguide comprises an impedance level transformer which has variations in the cross-section of the inner conductor and the outer conductor.

Abstract: A multiple channel amplifier providing both gain and/or phase shift to a microwave signal is formed of a set of transmission lines connected in parallel by means of a power splitter at the input end and a power combiner at the output end of the set of transmission lines. The transmission lines are disposed in a cylindrical array of electrically conducting bars which support amplifying and/or phase shifting elements between the bars and withdraw heat from the amplifying and/or phase shifting elements. The transmission lines may be slotted or severed for directing power flow towards an output terminal of the amplifier. The amplifying and/or phase shifting elements are conveniently mounted on a set of heat sinks to form modules, each of which is readily inserted and detached from the cylindrical array.

Abstract: A multiple channel amplifier providing both gain and/or phase shift to a microwave signal is formed of a set of transmission lines connected in parallel by means of a power splitter at the input end and a power combiner at the output end of the set of transmission lines. The transmission lines are disposed in a cylindrical array of electrically conducting bars which support amplifying and/or phase shifting elements between the bars and withdraw heat from the amplifying and/or phase shifting elements. The transmission lines may be slotted or severed for directing power flow towards an output terminal of the amplifier. The amplifying and/or phase shifting elements are conveniently mounted on a set of heat sinks to form modules, each of which is readily inserted and detached from the cylindrical array.

Abstract: A multiple channel amplifier providing both gain and/or phase shift to a microwave signal is formed of a set of transmission lines connected in parallel by means of a power splitter at the input end and a power combiner at the output end of the set of transmission lines. The transmission lines are disposed in a cylindrical array of electrically conducting bars which support amplifying and/or phase shifting elements between the bars and withdraw heat from the amplifying and/or phase shifting elements. The transmission lines may be slotted or severed for directing power flow towards an output terminal of the amplifier. The amplifying and/or phase shifting elements are conveniently mounted on a set of heat sinks to form modules, each of which is readily inserted and detached from the cylindrical array.

Abstract: A power amplifier that divides input power among a plurality of parallel channels through a radial line divider, amplifies the power in each channel with three terminal devices, and combines the amplified power in a radial line combiner to produce an output signal. The radial line divider/combiner includes a radial transmission line having a plurality of sectors symmetrically disposed around the inner radius of a supporting annular substrate. The sectors are connected to respective three terminal devices through microstrip transmission lines, and are isolated from laterally adjacent sectors by thin film isolation resistors.

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

Abstract: A modular microwave power combiner having a plurality of identical microwave diode amplifier circuits grouped in sets within the body of a modular unit which are electrically coupled in parallel to a central cavity sized to be resonant at a single frequency to minimize mismoding thereby enhancing combiner efficiency. A number of waveguides are provided for coupling of the microwave diode in each amplifier circuit to the resonant cavity, and the waveguides are situated on one side of a PC board at the top of each modular unit. Since each of the modular units is essentially identical in physical size and shape, the overall power output of the power combiner can be increased by merely adding additional modular units. The individual modular units are sized to fit top-to-bottom such that the respective resonant cavities are spaced apart by one-half wavelength (.lambda./2) for the parallel electrical coupling of all of the resonating cavities.