Abstract: A signal delay assembly for a high power linear amplifier, using feedforward circuitry to reduce distortion, comprises an interdigital delay line unit with included directional couplers. The structure of the interdigital delay line is substantially in a parallelepiped housing. A co-axial connector constructed as an integral part of the delay unit is used for signal connection to the amplifier.

Abstract: A dielectric resonator block has at least three resonators and coupling device for coupling the adjacent resonators. A reactance element is added in parallel to the coupling device to provide an attenuation pole. A capacitor block of a dielectric material is provided which has through-holes to form hole electrodes and a surface electrode so that two coupling capacitances are provided. One of the two coupling capacitances serves as the reactance element. One of the hole electrodes of the capacitor block is connected with an external connector, and the other hole electrodes are connected with the resonators.

Abstract: A multipole bandpass filter (40) comprises a first microstrip split-ring resonator (12), having at least a first edge and a second edge, the first edge having a gap (20) therein, and an input. The bandpass filter (40) also comprises a second microstrip split-ring resonator (14), having at least a first edge and a second edge, the second edge of the second microstrip split-ring resonator comprising a gap (26) therein and a balanced output (30, 32). The bandpass filter also includes at least one straight line quasi-combline resonator (22), disposed between the first microstrip split-ring resonator, and the second microstrip split-ring resonator.

Abstract: Improved Q factor for stripline and microstrip filters can be realized by increasing the thickness of conductive paths. Increased conductive paths in a stripline and microstrip filter can be realized by forming slots (20) in a block of dielectric material (12) which permit an increased thickness of transmission path thereby improving the Q factor of the material by reducing at least resistive losses.

Abstract: An airline transmission structure in a low temperature co-fired ceramic ("LTCC"). A cavity is made within the LTCC structure. Ground planes surround the cavity. Electronic processing circuitry, such as an airline filter, is suspended within the cavity. Transmission lines are provided to connect the electronic circuitry to the electronic signals (typically microwave) which require processing. Full integration of the airline filter with other electronic circuitry in a single LTCC package is also shown.

Abstract: An interdigital resonant cavity filter structure is foled to provide two adjacent chambers physically positioned side by side and electrically connected in series with each other. A center plate divides the two chambers with a slot at one end of the structure to permit the two chambers to function as one resonant cavity in a folded relation to each other. Each chamber includes interdigital resonators which are related to the overall resonant cavity to produce a band pass filter action within the folded resonant cavity. The input of the filter structure is applied through a port of a circulator connected to one end of the resonant cavity and the output is taken from another port of the circulator. The opposite end of the resonant cavity is terminated in the characteristic impedance of the resonant cavity thereby causing the overall structure to operate as a high quality notch filter.

Abstract: A dielectric block filter construction having resonating cavities formed therein to form one half wave-wavelength resonators thereby. The resonating cavities span opposing side surfaces of the dielectric block forming the dielectric block filter to define openings at the opposing side surfaces. Outer surfaces of the dielectric block, including the opposing side surfaces having the openings defined thereat, are coated with an electrically-conductive material except for portions of one side surface of the dielectric block about peripheral surfaces of input and output couplers formed on the one surface. Because the opposing outer surfaces are coated with the electrically-conductive material, the opposing outer surfaces of the dielectric block are self-shielding to prevent propagation of electromagnetic radiation through openings defined by the resonating cavities of the dielectric block.

Abstract: A microwave band-pass filter of interdigital type employing microstrip lines and a filter characteristic adjusting method thereof are disclosed. The microwave band-pass filter includes plural stages of resonant lines. Furthermore, the resonant line includes a short-circuit portion, an open portion and a connection portion. The short-circuit portion has its one end grounded and the open portion has its one end open. The connection portion is interposed between the short-circuit portion and the open portion and has its width gradually increased from both sides of the short-circuit portion to both sides of the open portion.

Abstract: A microstripline interdigital planar filter has a number of microstripline coupled resonators in an inhomogeneous medium consisting a soft dielectric substrate, and a high dielectric constant, high Q ceramic superstrate. The resonators are printed on the soft substrate as thick copper strips. The rectangular shaped, silver-coated aluminum housing dimensions are chosen so as to give the highest available unloaded Q factor of the resonators. The high dielectric constant of the superstrate is chosen so as to give a very small resonator length resulting in a very small filter size. The input and the output ports are located at right tapping points on the two outermost resonators. The tapping points are chosen so as to match the loaded Q factor of the filter. Previous filters are physically larger and cannot achieve the same high level of performance characteristics as filters of the present invention.

Abstract: A bandpass/lowpass filter comprises a bandpass filter with two or more resonators with the first and last resonators coupled to associated connectors. Corresponding lowpass filters are positioned within the first and last resonators, wherein each lowpass filter comprises a plurality of low impedance and high impedance elements. A disk emanates from each of these integrated lowpass filters so as to couple the filtered electromagnetic energy to the bandpass filter. The overall result is an integrated filter having a desired bandpass with significant suppression of spurious frequencies. The overall integrated filter is significantly smaller than conventional filters using external inline lowpass filters.

Abstract: An integrated down converter and interdigital filter apparatus having a down converter and a number of interdigital filters mounted on the same printed circuit board and installed in the watertight housing. The housing of each interdigital filter is cut from sheet metal, with a conductive surface on the printed circuit board as one side. A method for construction of the interdigital filter is also set forth.

Abstract: A bandpass filter is disclosed which comprises a pair of opposing, first and second dielectric substrates each having an outer surface provided with a ground conductor, and a conducting resonator member provided between the first and second dielectric substrates and including a plurality of parallel resonator fingers each having an open circuit end and a base end electrically connected to said ground conductor, characterized in that a part of the ground conductor is removed to form an opening therein between adjacent two fingers, thereby to increase the bandwidth of frequency to which the filter responds.

Abstract: A comb-line band-pass filter with circular cross section is made up of internal rods constituting the resonators of the filter and brought to resonance by the use of tuning screws and alternating with coupling screws. In the filter the rods are inserted in such a manner that each one is rotated in relation to the preceding one by an angle of 0.degree.<.alpha.<90.degree. while the coupling screws are placed at an intermediate angle. For equal electrical characteristics the length of the filter is also a function of the rotation angle of the rods.

Abstract: An integrated local oscillator interdigital filter apparatus in a down converter is mounted on the same printed circuit board. The housing of the interdigital filter is cut from sheet metal, with a conductive surface on the printed circuit board as one side. A method for construction of the interdigital filter is also set forth.

Abstract: A UHF bandpass filter, comprising resonators, each of which is arranged in a respective cavity and which are coupled to one another via tracks etched on a printed circuit.

Abstract: A combline stripline filter includes a number of conductive strips, each connected to ground on one end and capacitively loaded to ground at the other end. Input and output pads will make a surface mountable connection to a printed circuit board. Tuning is provided for by removing ground over the extension ends of the outside resonators. The center resonators are tuned by removing metal from areas on the cover that are connected to the resonators by plated through holes. Undesired capacitance is compensated for by rounding the ends of the resonators and the opposing ground planes.

Abstract: A deformable or flexible diplexer element provides a common input to two separate bandpass filter arrays. The construction of the element and the associated diplexer filter containers are designed such that the average distance between each end of the element and its associated resonator can be easily adjusted to optimize coupling therebetween. With the individual adjustment and associated variable coupling, the filter responses are individually optimized to the appropriate frequencies.

Abstract: A diplexer having receive and transmit sections connected to a common port comprises square-cross section cavities arranged in rows and columns. At least three adjacent cavities form a triangular group in which the non-adjacent cavities are cross-coupled. The cross coupling means comprises an inductive loop or a capacitative probe. Adjacent cavities in each section are also coupled, on folded paths, by irises. Cavity wall thickness is reduced where possible. The antenna port is diplexed to both sections by a T-branch connector having wire sections which are tapped into central resonators at a predetermined distance above electrical ground. Low pass filters with non-overlapping peak responses provide further isolation between the sections.

Abstract: A high frequency band-pass filter which includes a single resonator or a plurality of resonators adapted to pass a high frequency signal of a predetermined frequency band region, and an active element device electrically coupled with one or the plurality of the resonators so as to present a negative resistance when the resonator is in a resonant state.

Abstract: A dielectric ceramic body for use in a band-pass filter. The ceramic body has a plurality of through holes formed to extend transversely from one side surface to another side surface which is opposite to the one side surface and arranged in series along a longitudinal direction of the body. Slits are formed on one of the aforementioned two side surfaces between respective two holes. The slits have depths which increase toward end portions of the ceramic body.

Abstract: A dielectric filter includes a single block made of dielectric material having three or more through holes, in each of which an inner conductor is deposited, to define three or more dielectric resonators coupled in a cascade manner. Coupling holes are each formed between a pair of neighboring dielectric resonators. A bypass circuit, having a reactance component, is provided for connecting between two or more coupling holes; or for connecting the through hole of the dielectric resonator and a coupling hole; or for connecting the input terminal and one or more through holes of the dielectric resonators or the coupling holes. By selecting the holes to be interconnected and the value of the reactance of the bypass circuit, it is possible to provide a filter having a frequency characteristic in a desired format, including at least one pole at a selected point in an attenuation region thereof, without any increase in the number of dielectric resonator stages of the dielectric filter.

Abstract: A microwave band pass filter comprises a band pass filter of the coaxial type which is formed by connecting plural coaxial type resonators in series through capacitors, and another band pass filter of the comb line type connected in series to the coaxial type band pass filter, wherein lower cutoff frequencies for the coaxial type band pass filter are included in a pass band for the comb line type band pass filter while higher cutoff frequencies for the comb line type band pass filter are included in a pass band for the coaxial type band pass filter, so that the skirting characteristic can be made sharp at high and low bands even with fewer resonator stages.

Abstract: An interdigital line type dielectric filter acting as a bandpass filter at radio frequencies has a dielectric body on which a grounding electrode is formed. Two parallel exciter lines extend through the block. Several resonant lines are juxtaposed to one another between the exciter lines. One short-circuited end of each resonant line is connected to the grounding electrode, while the other open end is not connected to it. The short-circuited end and the open end of any one of the resonant lines are disposed on opposite sides of those of its neighboring one resonant line. Those portions of the block which are in the vicinities of the open ends of the resonant lines are cut out so that the open ends are exposed.

Abstract: Microwave filters which have the best electrical characteristics for small volumes are required in radio communications particularly in traffic broadcast communication links and the invention provides filters formed as comb line or interdigital line filters in which the inner resonator conductors are formed as flat spirals.

Abstract: A dielectric filter comprises holes provided on a dielectric block, an inner conductor formed inside each hole, an earth electrode formed outside the dielectric block, a short-circuit electrode to connect the inner conductor with the earth electrode, input and output terminals inserted in the holes, a projection of dielectric material provided on the dielectric filter, one electrode formed on one surface of the projection and connected to the earth electrode, and other electrode formed on other surface of the projection and connected to the inner conductor, thereby large capacitance is formed between both electrodes and the dielectric filter can be formed in small size.

Abstract: A stripline filter includes a cylindrical substrate made of a dielectric material and having inner and outer surfaces with opposite ends thereof opened. A ground electrode is deposited on the inner surface, and on the inner surface, interdigitated electrodes are deposited. Alternately, the ground electrode may be deposited on the outer surface, and the interdigitated electrodes may be deposited on the inner surface. Thus, the stripline filter can be arranged in a compact size. Also, the ground electrode provided on the outer surface prevents electromagnetic waves generated from the interdigitated electrodes from being emitted out.

Abstract: A dielectric filter (FIG. 16) for frequencies higher than VHF band comprising a closed conductive housing (112), a pair of input and output means provided at both the extreme ends of said housing (112), a dielectric body (111) with a plurality of linear parallel grooves (118) arranged in said housing (112), a plurality of conductive linear means (113) with the length of approximately 1/4 wavelength mounted in said dielectric body (111) between said grooves (118) so that one end of said resonators (113) is fixed to the common plane of the housing (112), a capacitor means (114, 115) provided between the other end of resonators (111,113,118) and said conductive housing (112) so that an electrode (115) of said capacitor may be trimmed by a laser beam to adjust the resonating frequency of each of said resonators (111,113,118) and a plurality of conductive rods (137) provided in said grooves (118) for improving the spurious characteristics of the filter.

Abstract: A microwave filter which is optimized to reduce its dimensions, weight, cost, and manufacturabiity includes a filter body which is preferably manufactured by pressure die-casting of an aluminum alloy. In the filter body are formed a plurality of cavities in which resonators as well as tuning and connection screws are located. The cavities are so located with respect to each other that a line which joins the centers thereof appears as the series of connected line segments which are inclined with respect to each other at angles which exceed 90.degree.. To compensate the filter for the relatively larger coefficient of expansion associated with the use of die-castable alloys, the resonators and tuning screws employ materials which are different than that used in the filter body. Electrical losses are minimized by varying, from cavity to cavity, the ratio of the diameter of the cavity to that of the resonator. The weight of the filter is further reduced by cavities or voids which are formed therein.

Abstract: A duplexer includes an integral interdigital transmitter filter and parallel interdigital receiver filter in a common housing. A three-quarter wavelength antenna transformer section couples rf energy from the transmitter filter to an antenna and also couples rf energy from the antenna to the receiver filter and to an antenna cable connector.

Abstract: The invention provides electromagnetic resonators and high frequency filters constructed from these resonators which are formed by parallelepipeds made from a dielectric material, each of these parallelepipeds being covered with at least two metalizations disposed parallel to the direction of movement of an electromagnetic wave.

Abstract: A duplexer includes an integral interdigital transmitter filter and parallel interdigital receiver filter in a common housing. A three-quarter wavelength antenna transformer section couples rf energy from the transmitter filter to an antenna and also couples rf energy from the antenna to the receiver filter and to an antenna cable connector. The receiver filter selectivity is improved by providing a notch resonator between a receiver transformer section and the housing, and the transmitter filter selectivity is improved by providing a notch resonator between a transmitter resonator and the housing.

Abstract: A capacitor arrangement which is especially suited for use in an electronically tunable narrow band tuned cavity filter includes two capacitor plate portions which are juxtaposed one another to form a capacitor. One of the capacitor plate portions may be provided with a recess and with an internally threaded bore which opens into the recess, and an externally threaded trimmer slug may be received in the bore and extend to a greater or lesser degree into the recess and thus to contribute to a greater or lesser degree to the total capacitance of the capacitor. A dielectric spacer may be interposed between the capacitor plate portions to determine the size of the gap therebetween and to maintain the gap size constant.

Abstract: A dielectric filter (FIG. 16) for frequencies higher than VHF band comprising a closed conductive housing (112), a pair of input and output means provided at both the extreme ends of said housing (112), a dielectric body (111) with a plurality of linear parallel grooves (118) arranged in said housing (112), a plurality of conductive linear means (113) with the length of approximately 1/4 wavelength mounted in said dielectric body (111) between said grooves (118) so that one end of said resonators (113) is fixed to the common plane of the housing (112), a capacitor means (114, 115) provided between the other end of resonators (111,113,118) and said conductive housing (112) so that an electrode (115) of said capacitor may be trimmed by a laser beam to adjust the resonating frequency of each of said resonators (111,113,118) and a plurality of conductive rods (137) provided in said grooves (118) for improving the spurious characteristics of the filter.

Abstract: Microwave devices are fabricated by a method wherein a block of dielectric material is conformed to the physical configuration of a required microwave device, and it is then coated with electrically conductive material. Portions of the coating material are removed from predetermined regions of the block to implement a predetermined microwave device. One microwave device fabricated in accordance with the foregoing method is shown, and comprises an interdigital bandpass filter in which the block is shaped and drilled with a line of parallel holes to define the physical configuration of an interdigital filter in which the interiorly-coated drilled holes comprise resonator rods within a microwave cavity formed by the exteriorly-coated remaining portions of the dielectric material block. Coating material is removed from end portions of the rods formed by the coated holes in order to fine-tune the filter to a desired center frequency in the band of operation.

Abstract: An electronically tunable narrow band tuned cavity filter includes a housing which bounds a tuned cavity, a plurality of resonator bars secured to the housing, extending across the tuned cavity and having respective extensions that pass through respective openings of the housing to the exterior of the tuned cavity, and a set of tuning capacitor plates for each of the resonator bars. The tuning capacitor plates associated with the respective resonator bar are arranged outside the tuned cavity around the extension in a compartment surrounding the opening, together with respective switching networks driven by an electronic drive and operative for including the capacitor plates in or excluding the same from electric circuit with the respective resonator bar. The capacitor plates may be directly juxtaposed with associated facets of the extension to form respective tuning capacitors therewith.

Abstract: The present invention provides an improved microwave integrated circuit filter for electromagnetic waves. The filter includes a waveguide and three, four or more resonators spaced from one another and extending from the waveguide. Means, which may include a conductive ribbon, are provided electromagnetically coupling nonadjacent resonators.

Abstract: The disclosure relates to improved filter networks for use in the microwave region employing TTL logic and capable of changing a network from a "bandpass state" to an "all-stop state", or an "all pass state", or from a "low-pass state" to an "all pass state". Provision is also made for the increase or decrease in the selectivity of a low-pass filter.

Abstract: An improved distribution constant type electrical filter which is so arranged that columnar or cylindrical dielectric units each having conductive wires axially extended through it, are inserted into through openings formed in a dielectric material block and provided on their inner peripheral faces with inner electrically conductive layers for electrostatic coupling between the conductive wires and the inner electrically conductive layers.

Abstract: A comb-line type dielectric filter in which a plurality of resonator holes are made in a dielectric block at predetermined intervals and coupling adjustment holes are made between the resonator holes, the interior surfaces of the resonator holes and the surface of the dielectric block being entirely or partly covered with a conductor film. The coupling adjustment holes are disposed apart from the line joining the centers of the resonator holes, and a coupling adjusting member made of metal or dielectric material is inserted into each coupling adjustment hole.

Abstract: A system of slow wave structures for coupling a first electromagnetic circuit to a second electromagnetic circuit includes an inner slow wave structure and an outer slow wave structure concentric with the inner structure. The outer structure is configured to provide for a greater phase velocity of electromagnetc waves than the inner structure, the phase velocities for each structure being proportional to the circumference of each structure so that the rate of circulation of a wavefront about the common axis of the two structures is the same for a wave propagating about the inner structure and a wave propagating about the outer structure. The structures are terminated in their characteristic impedances to provide for wave propagation in one direction without reflections.

Abstract: A high frequency filter for frequencies higher than the VHF band comprises a closed conductive housing, a pair of input and/or output means like an antenna provided at both the extreme ends of said housing, a plurality of resonators arranged on a straight line between said antennas, each of said resonators having an elongated inner conductor and a cylindrical dielectric body surrounding said inner conductor, one end of each of said resonators being fixed on the single plane of the housing and the other end of each of said resonators being free standing, and the length between each of the resonators being defined according to the specified coupling coefficient for the desired characteristics of the filter.The present filter utilizes the coupling effect between resonators by the displacement current relating to surface TM mode and the conductive current relating to TEM mode. Therefore, no coupling means for providing the coupling between resonators is provided.

Abstract: Stripline filters and the like have one or more elongated resonator conductors positioned on a dielectric substrate which is backed by a ground plane conductor, with the response frequency being dependent primarily on the length of the resonator. A wide apron conductor is connected to the grounded end of the resonator and to the ground planes. The resonator and apron can be formed by use of a mask such that errors in alignment of the mask do not change the length of the resonator or the point of connection to the grounding apron. The apron, because of its width, has low transmission line impedance to the ground plane which is not changed by changes in configuration or position of the mask, so that it effectively grounds the resonator at the end thereof connected to the apron. A second dielectric substrate backed by a ground plane conductor may be placed on the resonator conductor.

Abstract: A method of fabrication and apparatus are disclosed for realizing a high-frequency non-transverse electromagnetic (non-TEM) mode interdigital band-pass filter. The filter has interdigital microstrip resonators R.sub.i separated a constant distance H from a ground plane by a propagation medium. The method of fabrication allows the W.sub.i /H.sub.i and S.sub.i,i+1 /H.sub.i dimensions of the filter to be obtained. The method starts by determining the self and mutual admittance values Y.sub.i,i and Y.sub.i,i+1, respectively, of each resonator R.sub.i. An estimate for W.sub.i /H.sub.i for each resonator can be made, if desired, using a single microstrip approach. The W.sub.i /H.sub.i estimates are used to obtain the S.sub.i,i+1 /H.sub.i value for each adjacent pair of resonators R.sub.i,R.sub.i+1. The S.sub.i,i+1 /H.sub.i values are used to obtain the values for Y.sub.f and/or Y.sub.fe for each resonator R.sub.i. The values for Y.sub.f and/or Y.sub.fe are used to calculate the value for Y.sub.

Abstract: A temperature-compensated microwave integrated circuit device such as a delay line in which the phase delay imparted to signals coupled through the delay line is substantially constant over a wide range of temperatures. A dielectric substrate is provided, with strip conductors on one surface defining a desired device configuration such as a multi-pole Butterworth filter configuration. The substrate is enclosed within a support frame with the lower side of the substrate positioned upon the bottom surface of the enclosure forming a ground plane. A conductive plate is attached to the top cover of the enclosure through a layer of compensating material. As the temperature changes, the layer of compensating material expands or contracts, thereby varying the height of the conductive plate above the substrate, which changes the electromagnetic field pattern of signals propagating along the delay line and, consequently, the propagation velocity.

Abstract: A microwave distributed-constant filter of a band-pass characteristic having at least one attenuation pole comprises resonator rods, each of which has an open and a shorted end and of which two first are inductively coupled in series through at least one second resonator rod. The first resonator rods are capacitively coupled direct to each other with a projection attached adjacent on at least one of the first resonator rods to the open end thereof. The first resonator rods may be coupled directly to input and output terminals of the filter. Alternatively, two third resonator rods may be interposed between the respective ones of the first resonator rods and the input and the output terminals. The third resonator rods may be inductively coupled direct to each other.

Abstract: In a band pass filter having a plurality of helical resonators each including a quarter-wavelength winding, at least two of the helical resonators are substantially shielded from each other by a partition wall, while the corresponding two quarter-wavelength windings which are shielded from each other are electrically connected to each other through a lead line which is insulated from the shield casing, thereby improving the cut off characteristic of the filter to cut off the applied signal more rapidly in the high frequency region of the band being filtered than in the low frequency region.

Abstract: The specification describes a vacuum device utilizing the multipacting phenomenon in a special insulated-electrode microwave comb-line structure and functioning as a high speed, single pole, single throw, RF switch with the exception that in the off condition, power is absorbed in the device.

Abstract: Stripline filters and the like have one or more elongated resonator conductors positioned on a dielectric substrate which is backed by a ground plane conductor, with the response frequency being dependent primarily on the length of the resonator. A wide apron conductor is connected to the grounded end of the resonator and to the ground planes. The resonator and apron can be formed by use of a mask such that errors in alignment of the mask do not change the length of the resonator or the point of connection to the grounding apron. The apron, because of its width, has low transmission line impedance to the ground plane which is not changed by changes in configuration or position of the mask, so that it effectively grounds the resonator at the end thereof connected to the apron. A second dielectric substrate backed by a ground plane conductor may be placed on the resonator conductor.