Abstract: A temperature-dependent capacitor comprises a first conductive plate, a second conductive plate located in a parallel-planar orientation to the first conductive plate, and a dielectric material located between the first conductive plate and the second conductive plate, the dielectric material having a temperature-dependent dielectric constant (?) value, wherein the temperature-dependent capacitor has a positive correlation of an operating temperature of the temperature-dependent capacitor to a capacitance value of the temperature-dependent capacitor.

Abstract: Apparatuses and methods for accelerating electrons including an electron source configured to provide a beam of electrons and an accelerator utilize electron cyclotron resonance acceleration (eCRA). The accelerator includes a radio frequency (RF) cavity having a longitudinal axis, one or more inlets, and one or more outlets and an electro-magnet substantially surrounding at least a portion of the cavity and configured to produce an axial magnetic field. At least one pair of waveguides couple the cavity to an RF source configured to generate an RF wave. The RF wave is a superposition of two orthogonal TE111 transverse electric modes excited in quadrature to produce an azimuthally rotating standing-wave mode configured to accelerate the beam of electrons axially entering the cavity with non-linear cyclotron resonance acceleration.

Abstract: This invention relates to a device for rapid focus control of one or more lasers. The controlled beam (5), is refracted by the dynamic refraction device (1) whose refractive index is set by its response to the control beam (3). The invention can be used for rapid focus and re-focus of a laser on a target as might be useful in such industries as flat panel television manufacturing, fuel injector nozzle manufacture, laser material processing/machining, laser scanning and indirect drive inertial confinement fusion.

Abstract: An HF generator has first and second solid-state switches. Each of the solid-state switches has first and second output connectors and is designed to switch a high-frequency electrical current between the first and second output connectors. Furthermore, the HF generator has a coaxial cable with first and second conductors. The first conductor successively has a first section and a second section in the longitudinal direction of the coaxial cable which are separated from one another by a first break point. The first output connector of the first solid-state switch is conductively connected to the second conductor, and the second output connector of the first solid-state switch is conductively connected to the first section. In addition, the first output connector of the second solid-state switch is conductively connected to the first section, and the second output connector of the second solid-state switch is conductively connected to the second section.

Abstract: Various apparatuses and methods for a vacuum electronic device are disclosed herein. In one embodiment, a vacuum electronic device includes a vacuum housing, an array of slow wave structures inside the vacuum housing sharing a common electron beam tunnel, an electron beam input port at a first end of the common electron beam tunnel, and an electron beam output port at a second end of the common electron beam tunnel.

Abstract: A resonant cavity with a bowtie shape supports an electromagnetic field used to deflect the trajectory of an electron beam passing through the cavity. The short transit time of the beam across the gap maintains the cavity fields at near-optimal phase, improving interaction efficiency even for relatively low-energy beams. High interaction impedance ensures good drive-power-to-deflection conversion efficiency. The uniform field achieved across the gap enforces uniform deflection across the beam profile to maintain beam quality. Multiple bowtie cavities can be arranged to allow arbitrary two-dimensional deflections.

Abstract: The disclosure generally relates to a method and apparatus for providing high-speed, low signal power amplification. In an exemplary embodiment, the disclosure relates to a method for providing a wideband amplification of a signal by forming a first transmission line in parallel with a second transmission line, each of the first transmission line and the second transmission line having a plurality of superconducting transmission elements, each transmission line having a transmission line delay; interposing a plurality of amplification stages between the first transmission line and the second transmission line, each amplification stage having an resonant circuit with a resonant circuit delay; and substantially matching the resonant circuit delay for at least one of the plurality of amplification stages with the transmission line delay of at least one of the superconducting transmission lines.

Abstract: A solid state power amplifier (SSPA) system may include a radio frequency (RF) input, an RF waveguide split block, multiple monolithic microwave integrated circuit (MMIC) power amplifier modules, and/or a heat spreader. An MMIC power amplifier module may include a backing, a board, at least one MMIC, and/or a cover. A method for dissipating heat within an SSPA may include receiving an RF signal, splitting the RF signal, amplifying multiple RF signals, combining the multiple RF signals, generating heat, and/or dissipating heat.

Abstract: An amplifier system includes a power divider for dividing an input RF signal into M RF signals of equal power and phase. The system has M low power selectable phase shifters each for phase shifting one of the M RF signals. M high power amplifiers are coupled to respective ones of the phase shifters. The system includes an M×N power distribution network having M input ports and N output ports, such as a Butler matrix. The M high power amplifiers are connected to a respective one of the M input ports of the distribution network. The phase of the M phase shifters may be adjusted to obtain a maximum output at the desired output with all the other outputs nulled.

Abstract: A radial power divider-combiner is disclosed. Such a radial divider-combiner may include a plurality of waveguides, each of which extends between a central monopole antenna and a respective peripheral monopole antenna. Such a waveguide may have a central portion with a height-to-width ratio of two, and a peripheral portion having an aspect ratio of one. To improve impedance-matching, a transformer portion may be disposed between the central portion and the peripheral portion. Such a transformer portion may have any number of sections, from one to infinity, with each section having a respective height between that of the central portion and that of the peripheral portion. In the extreme case, where the number of “sections” is infinite, the height of the transformer portion may vary linearly from that of the central portion and that of the peripheral portion.

Abstract: A radial power divider-combiner is disclosed. The divider-combiner includes a divider and a combiner. An input signal is provided to a transmission antenna that radiates the input signal inside the divider. Within the divider, the input signal is divided into a plurality of individual signals. The individual signals are received by receiving antennas and provided to respective amplifiers. The amplifiers amplify the respective individual signals by a desired amplification factor. The amplified individual signals are provided to a plurality of transmitting antennas within the combiner. Inside the combiner, the amplified individual signals are combined to form an output signal that is received by a receiving antenna in the combiner.

Abstract: A radial power divider-combiner is disclosed. The divider-combiner includes a divider and a combiner. An input signal is provided to a transmission antenna that radiates the input signal inside the divider. Within the divider, the input signal is divided into a plurality of individual signals. The individual signals are received by receiving antennas and provided to respective amplifiers. The amplifiers amplify the respective individual signals by a desired amplification factor. The amplified individual signals are provided to a plurality of transmitting antennas within the combiner. Inside the combiner, the amplified individual signals are combined to form an output signal that is received by a receiving antenna in the combiner.

Abstract: A radial power divider-combiner is disclosed. The divider-combiner includes a divider and a combiner. An input signal is provided to a transmission antenna that radiates the input signal inside the divider. Within the divider, the input signal is divided into a plurality of individual signals. The individual signals are received by receiving antennas and provided to respective amplifiers. The amplifiers amplify the respective individual signals by a desired amplification factor. The amplified individual signals are provided to a plurality of transmitting antennas within the combiner. Inside the combiner, the amplified individual signals are combined to form an output signal that is received by a receiving antenna in the combiner.

Abstract: A given high frequency electric power introduced into a cavity resonator is resonated in the long direction of the cavity resonator on an excited mode with a constant electric field intensity along the long direction of the cavity resonator. Then, a human body is set on a table 2 in the cavity resonator so that its body axis can match the long direction of the cavity resonator. Then, the resonated high frequency electric power is applied to the human body.

Abstract: A high frequency amplifier with the multi-space structure, amplifying various frequencies by a Gunn diode in the multi-space structure, composed of non-radiative dielectric waveguides of various different sizes. An amplifier circuit includes a Gunn diode inserted in a space between two metal plates of a certain distance from each other, a circulator which revolves input waves and determines transmission direction, a first non-radiative dielectric waveguide, which is connected to the circulator, sending the input waves from the input terminal to the circulator, a second non-radiative dielectric waveguide, which is connected to the circulator, sending the input signals from the circulator to the Gunn diode and sends the amplified signals from the Gunn diode back to the circulator; and a third non-radiative dielectric waveguide, which is connected to the circulator, sending the amplified signals, which come into the circulator through the second non-radiative dielectric waveguide, to the output terminal.

Abstract: A waveguide for amplifying electromagnetic radiation of a characteristic wavelength includes a first reflector, a second reflector, and a gain medium having a characteristic wavelength of emission disposed between the first and second reflectors. The first and second reflectors are spaced apart from each other to form a microcavity which is off-resonance with respect to the characteristic wavelength of light emitted by the excited gain medium.

Abstract: A cylindrical microwave cavity 12 has a pinched center 28, 30. Two apertures 28, 30, one in the center. of each face of the cylinder 10, provide access for a gas/powder mixture 124 having a dielectric coefficient depending on its density or some other measurement of interest. The faces 20, 22 of the cylinder 10 are much farther apart at the unpinched periphery, which comprises most of the volume of the cavity. The wider spacing allows an antenna 34 to be placed in the cavity 12, and provides a high Q-factor to maximize the sensitivity of the cavity 12. At the same time, certain resonance modes are greatly affected by a change in the dielectric coefficient of the gas/powder mixture 124 in the pinched portion 28, 30. The density of the powder or any other convenient variable may thus be servoed to any desired value. The powder 124 may be blown through the cavity 10, encased in tube 120 affixed to the cavity 12.

Abstract: An active RF cavity is defined by a conductive wall in which a plurality of solid state power amplifiers are mounted. The solid state power amplifiers induce an RF current at an inner surface of the wall to form an oscillating electromagnetic (EM) field within the cavity. Preferably, the power amplifiers are in the form of modules that contain a number of RF power chips. The structure operates as both a power combiner and a matching transformer and is powered by a relatively low voltage d.c. source. A high-amplitude field is generated using equipment that is more efficient and much lighter in weight than conventional equipment. Such a cavity may be applied in a drift tube linac, an RF quadrupole linac, a linac having aligned cavities, and in other types of particle accelerators, and as a high power RF amplifier with the EM waves piped out via a waveguide or a coaxial cable.

Abstract: There is disclosed a system for linearizing an RF amplifier by the application of suitable load impedances to its 2nd, 3rd, and higher order output signals, thereby reducing output distortion products and improving performance. Intermodulation Distortion (IMD) reduction results from controlled termination of harmonic tuned filters produced by impedance selection and/or filter detuning. Preferably the apparatus comprises parallel band-pass filters including a filter passing the fundamental signals only; a filter passing 2nd harmonics; and a filter passing the 3rd harmonics. These, and optionally higher order filters, are employed for suppressing harmonic frequencies and reducing IMD. Preferably all filters have sufficient isolation to prevent serious interaction between filters. Therefore a selected mismatch provided at each of the harmonic output ports linearizes the amplifier's output.

Abstract: Directional couplers 7.sup.1 -7.sup.20 are used to couple power from r.f. power amplifier modules 5.sup.1 -5.sup.20 to a transmission line 6 or other type of resonator, from which it is withdrawn by directional coupler 8. The power withdrawn from the continuous transmission line, which is an integral number of wavelengths at the operating frequency of the modules in length, is less than the power circulating around the transmission line 6. The balance load may be removed to enable the output load to be combined with the output of another r.f. power amplifier operating a different frequency so that e.g. sound and vision signals can be combined at an aerial and, in the latter case, means may be provided for improving the resonance of the main loop 6.

Abstract: The wave propagation signal transmission device according to the invention comprises two coupled distributed-constant wave propagation lines. The lines include active members of amplifying signals in transit in the form of linear and continuous components in parallel relationship. In particular, a cathode 318, and control grid 320, decoupling/accelerating screen grids 324, 326, receive, at E, HF signals to be amplified, and an anode 322 delivers, at S, amplified signals. Possible uses of the device according to the invention are high power and very wide band HF amplification and the generation of electromagnetic pulses very steep rise front and of long duration.

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

Abstract: Anisotropic plasma etching is accomplished utilizing a helical resonator operated at relatively low gas pressure. The use of this combination yields an extremely high flux of ionic species with resulting rapid anisotropic etching. A helical resonator in conjunction with suitable precursors is also quite useful for plasma induced deposition.

Abstract: The nonlinearity of the frequency response of a solid state power amplifier (SSPA) is obviated by effectively operating the SSPA at the 1 dB compression point, where the nonlinearity does not exist, and controllably reducing, downstream of the SSPA, the power output produced by the SSPA to the level required by the link. In particular, the output is reduced by controllably inserting a relatively thin tapered blade of ferrite material into a waveguide coupling section downstream of the SSPA. Preferably the ferrite material is comprised of a robust carbonyl steel of sufficient thickness to withstand the heat induced in the course of its absorbing microwave energy at the SSPA output, while being of a narrow or thin configuration and oriented for insertion into the absorbing section of waveguide so as to not effectively alter the characteristics of the signal profile of the electromagnetic wave.

Abstract: A microwave power combiner having a spherical region from which six rectangular waveguides extend oppositely along mutually orthogonal diameters. The long dimension of each waveguide cross section extends along a diagonal of a cube circumscribing the region and extends orthognally to this long dimension of the opposite waveguide. One waveguide is an input for an injection locking signal, and four waveguides are inputs for power to be combined in the region from oscillators controlled by the signal. No circulator is required, and the combined power may be output through the remaining waveguide or through the injection locking input waveguide. A number of the combiners may be connected with the output of one combiner serving as an injection locking input or as one power input to another of the combiners.

Abstract: A power combiner includes an input power splitter driving a plurality (N) of amplifiers. The amplifier outputs have Z.sub.0 output impedance and are coupled by transmission (TX) lines of Z.sub.0 characteristic impedance to the junction point of a lossless power combiner. Short-circuiting switches located .lambda./4 from the junction power disconnect failed amplifiers from the combiner. According to the invention, a number M<N of the shorting switches are open during normal operation, so the impedance presented by the parallel TX lines at the junction of the combiner is Z.sub.0 /M. An impedance transformer associated with the combiner transforms the junction point impedance Z.sub.0 /M to Z.sub.0 at the combined output port, for example, by a .lambda./4 line having an impedance .sqroot.Z.sub.o.sup.2 /M.

Abstract: A resonant cavity arranged for an electron beam to pass therethrough, is made of two spaced apart parallel substantially planar members movable with respect to each other in a direction perpendicular to their major surfaces, at least one of said members having a delay line structure on its inner face within the gap between said two members. Means are arranged for moving the members relative to each other so as to vary the spacing between said members, whereby the oscillation frequency is tuned easily. The resonant cavity can be used to realize wide-band extended interaction oscillators and klystron amplifiers.

Abstract: A microwave amplifying apparatus includes a waveguide which is shorted at one end and supplied with a TM mode or a TE mode signal, a pickup probe mounted on the waveguide for converting the signal into a TEM mode signal, and microstrip lines and field effect transistors, or amplifier elements, for amplifying the TEM mode signal. A matching device is arranged on the shorted waveguide adjacent to an incidence side with respect to the pickup probe while an input terminal of the first-stage amplifier element is directly interconnected to an output terminal of the pickup probe. The device is, therefore, free from a signal loss otherwise developed between the pickup probe and the initial-stage amplifier element. The matching device consists of three conductive rods which are spaced a quarter-wavelength distance from each other, and three lock nuts for fixing the conductive rods.

Abstract: Improved apparatus and method are provided for the coherent amplification and injection of radio-frequency (rf) energy into a load cavity using a plurality of amplifier tubes. A plurality of strip line cavities (30, 32, 34, 36, 40, 42, 44) are laterally joined to define a continuous closed cavity (48), with an amplifier tube (50, 52, 54, 56, 58, 60, 62, 64) mounted within each resonant strip cavity. Rf energy is injected into the continuous cavity (48) from a single input (70) for coherent coupling to all of the amplifier tubes for amplification and injection into the load cavity (76).

Abstract: Apparatus and method for generating and controlling the electric field within the cavity of a particle beam accelerator. A power splitter divides a common drive signal into separate branches each driving separate RF amplifiers. The output of each amplifier is coupled, through a circulator, to a separate input launcher within the cavity. The high Q of the cavity causes the signal from each launcher to combine to form an undistorted field pattern within the cavity regardless of small amplitude and phase differences at each launcher. Total power control is maintained by changing the phase in one or more of the separate branches, or by chopping the power applied to the amplifiers in the controlled branches. To improve efficiency, the input launchers in branches which are turned off by the chopping technique may be shorted to ground during the turned off interval.

Abstract: Radially fed microwave signal combiner/distributor apparatus comprising a central coaxial connector which is coupled via radially extending paths to several circumferential coaxial connectors which are equiangularly disposed on the circumference of a circle surrounding the central connector, the apparatus including a generally discoidal microwave transmission cavity through which the paths extend, which cavity communicates at the center thereof with the central coaxial connector and which cavity communicates at the circumferential periphery thereof with the circumferential coaxial connectors via a conductive annulus, which annulus is spaced away from the internal circumferential periphery of the cavity, and to which annulus the inner conductors of the circumferential coaxial connectors are electrically connected at locations equiangularly spaced around the annulus.

Abstract: A high-frequency amplifier device according to this invention comprises a high-frequency amplifier portion, a high-frequency input portion which is formed of a waveguide and which can transmit polarized signals orthogonal to each other, two detector portions which are inserted in the waveguide of the input portion and which respectively and independently detect the polarized wave signals orthogonal to each other, an irreversible circuit to which the polarized wave signals detected by the detector portions are individually input and which selectively and switching delivers one of the polarized wave signals to the high-frequency amplifier portion and returns the other polarized wave signal to the input portion, and a switching control mechanism for switching and controlling transmitting directions of the irreversible circuit in response to a control signal externally applied.

Abstract: A method and arrangement for enhancing the level of supplied microwave energy including a resonant ring capacitively coupled to a microwave coupling device effective for connecting to a microwave transmission line, the arrangement being mounted in a shield structure. Amplification is effected by IMPATT diodes capacitively coupled to the resonant ring. The microwave coupling device is variably setable with respect to the transfer structure, thereby promoting the establishment of impedance matching therebetween.

Abstract: An IMPATT diode mounted in a double-tuned resonant cavity to exhibit stability by suppressing subharmonic frequencies is disclosed. A foreshortened quarter wavelength section is connected to the diode to form an equivalent parallel resonant circuit at one end thereof. At the other end of the quarter wavelength section is an odd-quarter wavelength tuning slug which provides a section which exhibits a second, series equivalent resonant circuit. To provide increased stability at subharmonic frequencies, a half-wavelength tuning slug is disposed adjacent to the odd-quarter wavelength section. The half wave tuning slug is virtually transparent at the operating frequency, but is a quarter-wavelength at the first subharmonic, and thus exhibits a high resistance at the subharmonic frequency.

Abstract: A tuning system employs a specific resonant circuit which includes two electrodes confronting each other through a dielectric interposed therebetween. Each of the two electrodes has at least one bent portion to present a lumped-constant inductance and has a desired equivalent electrical length. The two electrodes respectively have common terminals located out of mutually confronting positions so that voltage signals induced by mutual inductance between the electrodes will be opposite in phase so as to thereby produce a parasitic distributed-constant capacitance. The two electrodes form a two-terminal circuit network having a first terminal disposed at a desired position on one of the two electrodes and the common terminals as a second terminal. The first terminal of the resonant circuit is connected to a feedback amplifier, an amplifier, or a mixer so as to form a tuning oscillator, a tuning amplifier or a mixer.

Abstract: A plurality of negative resistance devices is spaced below a cylindrical center conductor of a single coaxial cavity. Each negative resistance device has a bias device connected to it by a bias wire. Extending radially through the outer wall of the coaxial cavity is a coax cable with an RF coupling probe. A tuning screw is place axially through the interior of the center conductor for tuning the frequency of the power combiner.

Abstract: A waveguide amplifier circuit has two semiconductor amplifier elements in a first waveguide circuit, a second waveguide circuit which is perpendicular to the first waveguide circuit and a termination circuit arranged at an end, remote from the semiconductor amplifier elements, of the second waveguide circuit. An abnormal oscillation component between the two semiconductor amplifier elements is attenuated by the second waveguide circuit and the termination circuit, thereby obtaining a high power output.

Abstract: The invention relates to an output amplifier for a transmitting tube, having an operating frequency located in the FM- and the VHF- frequency bands. In order to match the output impedance of the preamplifier to the input impedance of the output amplifier the output amplifier includes a broad-band impedance transformer. Mechanical and electrical flexibility is obtained by using an impedance transformer formed from series/parallel arrangements of coaxial cables. The impedance transformer needs little room and nevertheless provides a broadband impedance match.

Abstract: A distributed inductive reactance is coupled to a terminating impedance at the interface of a combiner probe with a resonant cavity. The distributed reactance is implemented by a metal insert having a cavity interface and having a coupling portion, which is coaxial with a cylindrical dielectric and with a cylindrical cavity in an end of the terminating impedance.

Abstract: Disclosed is an electric oscillation generator comprising an exciter and an output amplifier stage utilizing a vacuum tube connected in a common-grid circuit. A section of the input circuit of the vacuum tube is connected to the output of the exciter. The exciter is made as a power supply through a compensating-voltage producing device connected in series with said section of the input circuit and having an output voltage opposite in phase to the voltage across said section of the input circuit of the vacuum tube.

Abstract: A diplexer is disclosed for use in remotely fed intermediate regenerators or repeaters of broad-band transmission systems with coaxial cable sections. The diplexer has a high circulating attenuation at high frequencies. Since sections of the regenerator are at a remote feed potential and are connected to the inner conductor of the feed cable, a plurality of high-voltage stable feed-through capacitors as well as line inductors are required for decoupling the regenerator from noise voltages. In view of a lower expense and simpler structure, a diplexer is provided according to the invention which, at its carrier body, contains a tubular body with a material having a high dielectric constant and corresponding dielectric strength. The stripped feed cable is conducted through its free inside diameter, said tubular body being continuously metallized on the inside and by sections on the outside. It also contains ferrite rings at the outside at sections of the outer tubular body which are free of the metallization.

Abstract: A combiner for power combining electromagnetic energy is disclosed. At least two electromagnetic cavities are positioned having intercavity coupling among all cavities: each cavity is tangent to all other cavities and/or external transmission line connections are employed to enhance/provide intercavity coupling. Each cavity contains within it at least one power generating device. An input/output port is connected via a nonreciprocal device to an output load and an injecting oscillator which usually has a lower power level than that of the free-running combiner and a higher spectral purity. The cavities are intentionally tuned to at least two different frequencies. For the two cavity and three cavity embodiments, a greater bandwidth is obtained compared with prior art combiners where the cavities are tuned to the same frequency. The power loss is slight.

Abstract: A divider/combiner amplifier circuit divides input power through a sectored coaxial line to a plurality of longitudinal parallel channels spaced around the circumference of a cylinder; the power in each channel is amplified by a semiconductor device; and the amplified power is combined in another sectored coaxial line. A microwave waveguide connected to the input and output of each amplifying device confines the microwave energy of the operating mode to the longitudinal channel formed by said waveguide. Each waveguide extends longitudinally along the cylinder and each is circumferentially spaced from its neighboring waveguide by a space which forms a cut-off waveguide to the operating mode.

Abstract: A divider/combiner amplifier circuit divides input power through a sectored coaxial line to a plurality of longitudinal parallel channels spaced around the circumference of a cylinder; the power in each channel is amplified by a semiconductor device; and the amplified power is combined in another sectored coaxial line. A microwave waveguide connected to the input and output of each amplifying device confines the microwave energy of the operating mode to the longitudinal channel formed by said waveguide. Each waveguide extends longitudinally along the cylinder and each is circumferentially spaced from its neighboring waveguide by a space which forms a cut-off waveguide to the operating mode.

Abstract: A microstrip integrated circuit reflection amplifier utilizing packaged diodes and permitting some gain and bandwidth adjustment. A 3 db quadrature coupler has two of its ports connected to substantially identical reflection amplifiers. The reflection diodes are adjustably mounted in brackets perpendicular to the dielectric substrate of the microstrip network and may be moved in and out along the microstrip circuit to provide for some gain correction and bandwidth adjustment.

Abstract: An RF tank circuit for a transmitter power amplifier stage including a half-wave length "folded" coaxial transmission line as an anode tuning device. The tank circuit has a grounded outer conductor and an ungrounded inner conductor, the latter to be operated at a high RF potential. The outer conductor is connected electrically to a third conductor which is adjustably extensible into the ungrounded inner conductor, hence, suggesting a folded effect for the outer conductor and the third conductor in combination. The third conductor has a bellows which can be expanded or contracted by drive means disposed exteriorly of the cavity, thereby to fine-tune the cavity to a selected frequency. The third conductor has mounting means which permit its extension into the inner conductor to be variable, thus allowing for coarse adjustment of the bandwidth, prior to the fine-tuning accomplished by suitable bellows-drive controls.

Abstract: A resonant circuit arrangement for anode resonant circuits in radio frequency output amplifiers. A transmitter tube is formed with a cylindrical grid electrode and, coaxial therewith, a hollow cylindrical anode member encircling the grid electrode. A first circular metal disk extends perpendicularly from the grid electrode beyond the anode member. A second circular metal disk, with a smaller external diameter than the first, extends perpendicularly from the outer surface of the anode member. A hollow metal cylinder extends from the peripheral edge of the first circular metal disk past the second circular metal disk. A third circular metal disk extends from the hollow metal cylinder parallel with the first and second circular metal disks and on the side of the second disk opposite the first disk. A fourth circular metal disk is positioned between and parallel to the third and fourth disks.

Abstract: A device to suppress the generation of second harmonic frequencies in a power amplifier tank circuit such as may be used in a radio frequency transmitter. The present invention employs a device connected between the outer conductor (which is normally at ground potential) and the inner conductor. Specifically, the device utilizes a metal strap, such as a copper strap, which is connected to the inside surface of the outer conductor in an electrically conductive manner and which is also connected to a capacitor disk movably mounted with respect to the inner conductor. The capacitor disk is mounted to an insulating arm or rod and may be projected back and forth within the space between the outer and inner conductors, thereby adjusting the impedance of the device. By sliding the rod toward the inner conductor, the loop formed by the copper strap becomes more straightened thereby changing the inductance of the circuit.

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 microwave oscillator/amplifier includes a plurality of TEM transmission lines each with a negative resistance device at one end and a lossy, matched termination at the other end. A resonant cavity is coupled to each TEM line so as to induce a parallel resonance on the lines at the region of coupling. Structural means are provided for maintaining the characteristic impedance of the TEM lines uniform along the length of said lines. Fabrication of a device in which the TEM line characteristic impedance was uniformly maintained along the line length at five times the optimum negative resistance of said negative resistance device is noted. Suggested levels of characteristic impedance are relatively low compared to prior art devices, none of which are known to attempt maintenance of characteristic impedance uniform along the length of the TEM transmission line.