Abstract: A strip transmission line for guiding a wave therein, including a strip-shaped inner conductor; an outer conductor surrounding the inner conductor with a clearance; a ferrite coating carried on at least one of the conductors; and at least one throughgoing slot provided in the inner and outer conductors for dividing the inner and outer conductors into at least two inner conductor sections and at least two outer conductor sections. The slots extend in a direction of wave propagation, whereby a variable current applied to the inner and outer conductors flows in one direction in one of the inner and outer conductor sections and returns in an opposite direction in another of the inner and outer conductor sections for generating a variable premagnetizing field within the strip transmission line between the inner and outer conductors to vary an electric length of the strip transmission line.

Abstract: A filter (102) with an adjustable bandwidth. The filter (102) has a predetermined passband and stopband, and an input (104), an output (106) and at least two resonator structures (116, 124), and a variable reactance element (108) for adjusting the bandwidth of the passband, coupled between the resonator structures (116, 124), whereby the frequency response is adjustable.

Abstract: A coupled capacitor substrate having thereon a plane capacitor which is integrally bonded on a dielectric resonator and a varactor which is mounted on the coupled capacitor substrate so as to couple the dielectric resonator via the plane capacitor.

Abstract: A transmission line resonator assembly (100) employs a method and apparatus for adjusting its resonant frequency. The transmission line resonator assembly (100) comprises a resonator portion (101) and an electrically conductive member (102). The resonator portion (101) is operable at the resonant frequency and includes a transmission line (103) that is disposed on a dielectric material (104). A first portion (106) of the transmission line (103) is electrically coupled to a signal common (109) by a first coupling impedance. The electrically conductive member (102) includes a first deflectable surface (113) lying substantially along a first plane (201) and is coupled to the resonator portion (101) and the signal common (109), such that the first deflectable surface (113) is positioned substantially adjacent to the transmission line (103).

Abstract: The present invention relates specifically to the temperature compensation of a resonator in which a rod or a conductor wound in the form of a cylindrical coil serving as an inner conductor is enclosed within a metal cover and in which the open end of the rod or the coil is spaced a given distance from the cover, thus forming a loading capacitance. A change in the resonant frequency caused by thermal expansion can be compensated for in that at the open end of the inner conductor within the housing there is provided a compensation plate (5), the center part (12) of which is spaced at a distance (a) from the top surface (4) of the housing and preferably in parallel therewith and which has at least at two opposite edge parts (8, 9) been attached to the top surface (4).

Abstract: An adjustable resonator arrangement comprises a main resonator (T1) and a secondary resonator (T2) reactively coupled thereto. The secondary resonator includes a switching element (S), e.g. a varactor, having at least two states. When the switching element is in a first state the secondary resonator behaves as a half-wave resonator having a resonant frequency f.sub.o substantially different to the resonant frequency f of the main resonator. Consequently the secondary resonator has no appreciable affect on the resonant frequency of the main resonator. However, when the switching element is in a second state, the secondary resonator behaves as a quarter-wave resonator having a resonant frequency 2*f.sub.o which is closer to the inherent frequency f of the main resonator and sufficiently close to cause a shift .DELTA.f in the effective frequency of the main resonator.

Abstract: A dielectric TEM resonator, whose resonant frequency is adjustable in both directions after being incorporated in a circuit, is disclosed. A first dielectric TEM resonator comprises a metal member disposed near an open end of a resonator body and coupled to an inner or outer conductor of the resonator body. The resonant frequency is adjusted by adjusting a distance between the open end and the metal member. A dielectric material of a second dielectric TEM resonator is partially exposed, and a dielectric board for mounting the resonator body is also exposed in a corresponding part to the exposed part of the dielectric material. The exposed part of the dielectric board is partially covered with a metal plate. The resonant frequency is adjusted by adjusting the covered area.

Abstract: A dielectric resonator (400) is formed, according to the invention, from a block of dielectric material having top, bottom, and side surfaces. A protuberance (407) is formed on at least the top surface of the block. Further, a hole (405) is formed through the block, which hole extends substantially from the apex of the protuberance, through the block, to the bottom surface. The hole and protuberance combine to form a mesa structure (604, 704). The bottom surface, side surface, and an interior surface of the hole (405) are coated with a conductive layer. Further, a conductive coating is selectively disposed on the top surface of the block, which coating at least partially covers the mesa (604, 704). A dielectric block resonator (400, 500) is thereby formed whose resonant characteristics are at least partially determined by the physical dimensions of the mesa (604, 704).

Abstract: A high-frequency coaxial resonator including a tubular dielectric member having a through hole and provided with inner and outer peripheral surfaces and a pair of end surfaces which axially oppose each other. An inner conductor is formed on the inner peripheral surface and an outer conductor is formed on the outer peripheral surface, the outer conductor extending onto one or both end surfaces of the tubular dielectric member so as to approach the inner conductor through a prescribed clearance, thereby forming a capacitance between the inner and outer conductors for adjusting the resonant frequency of the resonator.

Abstract: A coaxial resonator with a distributed tuning capacity. The resonator includes one outer conductor and one central conductor, both conductors having a symmetry of revolution around a predetermined central axis. The tuning capacitor is fully distributed along the axis of the resonator and includes at least two cylindrical armatures nested into each other and having the axis of the resonator as their central axis, one of the two armatures constituting one of the two conductors of the resonator. The coaxial resonator may find particular application for RMN magnetometer probes.

Abstract: A broadband, varactor-tuned shorted coax resonator is provided with a single point coupling port that facilitates coupling of discrete circuitry to the distributed resonator to form an oscillator. The coupling port is defined by adding a second shorted coax line across the end of the first. The outer conductors of the two lines are interconnected. The inner conductors of the two lines are serially coupled and define a coupling gap, either along their length or at their ends, across which discrete circuitry can be connected. In a preferred form of the invention, the discrete circuitry is positioned in a region within the periphery of one of the inner conductors in order to provide an electromagnetic shield for the circuitry.

Abstract: A broadband, varactor-tuned shorted coax resonator is provided with a single point coupling port that facilitates coupling of discrete circuitry to the distributed resonator. The coupling port is defined by adding a second shorted coax line across the end of the first. The outer conductors of the two lines are interconnected. The inner conductors of the two lines are serially coupled and define a coupling gap, either along their length or at their ends, across which discrete circuitry can be connected. In a preferred form of the invention, the discrete circuitry is positioned in a region within the periphery of one of the inner conductors in order to provide an electromagnetic shield for the circuitry.

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: A ceramic block filter (114,118) employs a novel tuning process which avoids the necessity of etching or abrading plating on the top surface of the block. Initially, the blocks (210) are prepared from a batch of ceramic material such that their height is intentionally longer than desired, so that the filter center frequency is slightly lower than desired. Next, an artwork mask (310) designed in accordance with pre-selected frequency related characteristics and desired performance specifications is used for applying an electrically conductive material (240) to the top surface of the block (210). Then, the center frequency and resonator length of the block (210) are measured and a new resonator length is calculated using the measured values. The bottom surface of the block (210) is next lapped to the new resonator length. Then, electrically conductive material is applied to the lapped bottom surface of the block (210).

Abstract: A sample head (1) with cage resonator includes an insert (51) which can be introduced into the cavity formed by the conductor sections (22) of the cage conductor and which increases the electric length of the cage resonator in such a manner that the cage resonator containing the insert assumes a resonant state at a second predetermined operating frequency f.sub.1, whereas without the insert introduced, it is resonant at a first predetermined operating frequency f.sub.o. By introducing or withdrawing the insert (51), it is therefore possible to operate a sample head of this type selectively with two different frequencies corresponding to the resonance frequencies of different nuclear species, for example the proton and the fluorine resonance.

Abstract: A filter having an improved frequency adjustment construction which is capable of conforming the frequencies of the resonators with better accuracy through improvements in the accuracy of the sizes of the electrodes used for frequency adjustment, and through better stabilizng of the filter characteristics through forming a positive connection between each electrode for adjustment use and the corresponding inner conductive film. Electrodes for adjustment use are formed on a base plate, which is a separate unit from the dielectric block, so as to connect them with the respective resonators through coupling members, whereby the size accuracy of the electrodes for adjustment use is improved so as to considerably improve the frequency adjustment accuracy. Also, the connection between the electrodes for adjustment use and the inner conductive films of the respective resonators is positively stabilized to improve the stability of the filter characteristics.

Abstract: A band-stop filter comprises a plurality of resonator units each comprised of an end-shorted coaxial resonator and a variable condenser connected in series therewith, a printed circuit board combining said resonator units in a multistage having thru-holes adjacent a bushing which isolates the inner conductor of the end-shorted coaxial resonator from the printed circuit board. A thru-hole conductor is provided in the thru-hole, and an adjusting screw having a radius is a little larger than the thru-hole. The adjusting screw can have both the proper torque and the electrical connection. The inner conductor surface of the resonator operates electrically as a stator and the adjusting screw operates as a rotor.

Abstract: A ceramic filter employs a novel tuning process which avoids the necessity of etching or abrading plating on the surface of the filter. The tuning is provided by determining a selected frequency related characteristic of the dielectric making up the block portion of the ceramic filter. For example, the quarter wave length frequency of the block may be measured. Next, plating artwork is designed in accordance with the determined selected frequency related characteristic. The artwork is then used for selectively applying a conductive material to a surface of the block in order to shift the determined selected frequency related characteristic to a desired (specified) frequency characteristic. By appropriately designing the artwork based on the determined selected frequency related characteristic, no etching or abrading to the plating on the block is required.

Abstract: A dielectric filter includes a plurality of coaxial resonators constituted by inner conductors formed on inner walls of a plurality of throughholes which are formed in parallel with each other on a dielectric block and an outer conductor which is formed on an outer surface of the dielectric block. A printed circuit board is disposed at a side of an open end of the dielectric block, and the printed circuit board and the dielectric block are accommodated in a metallic case which is electrically connected to the outer conductor. A projecting portion is formed on an inner surface of the metallic case to support the printed circuit board such that a predetermined gap can be formed between the printed circuit board and a bottom surface of the metallic case by the projecting portion, whereby a stray capacity is reduced. Therefore, it is possible to prevent resonant frequencies of the coaxial resonators from being changed or fluctuated, and thus a filter characteristic of the dielectric filter becomes good.

Abstract: A quarter-wave distributed-constant dielectric filter or resonator having a ceramic body which typically is composed principally of barium titanate. The ceramic filter body has one or more resonance holes extending therethrough. A conductive covering of silver or the like on the filter body has a portion formed on the surface defining each resonance hole. Mounted in each resonance hole is a prefabricated capacitor having a first terminal extending from within the resonance hole. The second terminal is electrically coupled to the conductive covering on the surface of the resonance hole. The capacitance of the capacitor or capacitors can be known before they are mounted to the filter body, so that the filter is readily manufacturable to exact electrical characteristics desired.

Abstract: A tunable ferrimagnetic resonator containing microwave filter with a plural piece housing is described. First and second body laminations are provided with channels and openings which form passageways and resonator receiving cavities when the laminations are assembled. These passageways and openings are preferably formed by chemical milling. Closure elements or shims overlay and close the ends of the resonator cavities. The body laminations and closure elements are of a nonmagnetic metal and are typically formed from flat thin sheets of material. Cover laminations, such as of plastic, clamp the closure and body laminations together and provide strength to the overall housing structure. Microwave filters of this invention are capable of being tuned up to 40 Gigahertz and higher.

Abstract: A dielectric filter and a method of manufacture. The filter includes a block of ceramic material having one or more holes extending from a top surface to a bottom surface, each of which is interiorly covered with conductive material so as to form an inner conductive layer. The bottom surface and side surfaces of the block are also covered with bottom and side conductive layers electrically connected to the inner conductive layers at the bottom surface. The inner conductive layer is further connected to spaced apart top conductive layer portions provided on the top surface of the block surrounding each hole. The top layer portions are spaced from each other and have an oblique edge portion which is capacitively coupled with, and obliquely faces an upper edge portion of the side conductive layers, the oblique edge facilitating adjustment of the resonant frequency by removal of a predetermined amount of conductive material therefrom.

Abstract: Coupled transmission line resonators, such as those in a solid-dielectric ceramic block filter, are fabricated with tuning regions formed by notches in the outer conductor extending longitudinally parallel with the inner conductors from both the low-impedance ends and the high-impedance ends of the resonators. Removing conductive material from the notches in the vicinity of the low-impedance ends of the resonators decreases their resonant frequencies; removing conductive material from the notches in the vicinity of their high-impedance ends increases their resonant frequencies. Sensitivity of tuning depends on the depth of the notches. By situating all tuning regions along a common side of a filter, tuning both higher and lower in frequency may be accomplished without a need to re-orient the filter in a production-line fixture.

Abstract: A ferrimagnetic resonator has improved high frequency response because a shorter, tapered pole shaft is substituted for the longer pole shafts of uniform dimensions in the prior art. This shorter, tapered shaft alleviates constrictions in the field of the magnetic flux, thus allowing for an improved flux density at the tip of the magnet and correspondingly improved high frequency operation of the ferrimagnetic resonator. In a preferred embodiment, the tip of the pole is replaced with a layer of a higher permeability, but also higher hysteresis, alloy to improve the flux density in the air gap where the ferrimagnetic crystal resonator elements reside. In alternative embodiments, the case end of the pole shaft can attain its greater dimensions because of sides that curve outward or that get larger in a series of steps.

Abstract: An adjustable electronic filter apparatus is disclosed comprising a dielectric block having one or more through-holes and having a conformal conductive coating substantially over all outside surfaces as well as each through-hole therein. Each through-hole so plated forms a resonator from a transmission line which includes an open portion, for providing capacitive reactance at a first end, and a short-circuited end as a base, for providing an associated distributed inductance at a second end thereof. A unique method of tuning the adjustable electronic filter, whether a single resonator, a plurality of resonators, or a plurality of intercoupled multi-resonator filters, is disclosed that permits bi-directional tuning for at least one resonator in each of the above exemplary embodiments. By selectively adjusting an inductive portion of the plating at the base of each resonator so tuned, a resonator is quickly and accurately adjusted to a desired frequency.

Abstract: A microwave diode tuning circuit including am IMPATT diode holder of coaxial form and an adjustable capacitor connected in a parallel resonant circuit by microstrip transmission line. The tuning circuit includes a stabilization network and a bias insertion network. Optionally, the tuning circuit may include a hybrid junction for coupling two such diode tuning circuits together. the diode holder includes an internally-externally threaded sleeve providing means for continuously adjusting, through a limited range, the inductance of the resonant circuit.

Abstract: A microwave filter comprising a rectangular ceramics block (30) having a plurality of elongated parallel holes (31-36) extending from the top surface to the bottom surface thereof. The holes are plated with conductive layers (37, 38), and flat conductive areas (39-44) coupled with the layers (37, 38) spatially disposed on the top surface of the dielectric block (30) surround opening ends of the holes (31-36). An input terminal and an output terminal are provided adjacent to the conductive areas (39, 44) at both the extreme sides of the dielectric block (30).

Abstract: A voltage tumble filter has several parallel coupled half wavelength lines. Each open end of a line is coupled to ground through a corresponding varactor. Voltage may be distributed to the varactors through a thin wire attached a quarter wavelength from each varactor.

Abstract: A dielectric resonator comprises a shield electrode defining a resonant space and cylindrical dielectric resonator element disposed and supported fixedly in the resonant space, to which an input and output are coupled. Into the hollow portion of the dielectric resonator element, a tuning unit made of a dielectric material is inserted so as to be displaceable in an axial direction therein. The tuning unit is coupled to a supporting axis which is displaceable axially, thus causing the tuning unit to displace in that direction. A resonance frequency of the dielectric resonator varies as the tuning unit displaces.

Abstract: A ceramic TEM resonator bandpass filter with varactor tuning is disclosed. The varactor is located within the resonator holes of a ceramic TEM resonator filter, and is positioned within said holes immediately above the upper extent of the metal plating forming the resonator in said resonator holes. The placement of the varactor in such a manner reduces the interference caused by the varactor in the interresonator coupling. A new apparatus for positioning the varactor within the resonator hole is disclosed and basically includes a conductive rod which at its top end receives the varactor.

Abstract: A multiresonator dielectric block filter is disclosed in which capacitive coupling between foreshortened resonators disposed in the dielectric block is controlled by an electrode strip coupled to the conductive material covering the majority of the dielectric block surface. The electrode strip extends at least partially between two adjacent resonators to control the capacitive coupling between the resonators.

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: Transmitter combining apparatus includes up to five RF filters (100) coupled to a microstrip combiner (300) for combining up to five input signals for application to a common antenna. The RF filter (100) includes a ceramic resonator (116) sandwiched between first and second compensating discs (114 and 120) and first and second shield plates (142 and 148) for temperature compensation, low loss mounting and heat sinking of the ceramic resonator (116). Good thermal contact between the ceramic resonator (116), discs (114 and 120) and shield plates (142 and 148) is produced by a compressive force exerted by springs (144-147) of shield plate (142) when the top cover (112) is attached to the aluminum housing (124). The resonant frequency of the RF filter is tuned by means of an aluminum tuning shaft (102) and ceramic tuning core (118) which are positioned by brass bushing (133) in top cover (112).

Abstract: A slot-line for a microwave device in which is mounted at least one diode connected in parallel between two metallic strips of the slot. At high frequencies (18 to 200 GHz), the inductance L of the diode connections presents a not-negligible impedance which makes it difficult to use the diode. The device in accordance with the invention comprises a slot-line reentrant circuit which provides compensation for the diode inductance and is constituted by a metallic section which is coplanar with the line and connected in series with the diode. The compensating section is short-circuited or open-circuited with respect to the metallic strip in which it is reentrant. The electrical length of the compensating section is adjustable by means of wire, conductive varnish or metal pads.

Abstract: An improved electrical trap construction for use in a high frequency circuit device, which is so arranged that a coaxial resonator is connected to a core pin of a coaxial connector mounted on a case which contains the device, so that main currents received from a hot signal line flow into or flow out of the coaxial resonator the inner conductive electrode layer of the coaxial resonator is in electrically conducting contact with the core pin of the connector so as to allow the coaxial resonator to provide parallel resonance at a frequency to be trapped.

Abstract: Apparatus for varying the magnetic field in a magnetic resonant element which comprises a magnetic yoke with one or more magnets mounted within the magnetic yoke so as to generate a substantially uniform magnetic field in the magnetic yoke and a plurality of magnetic resonance elements located in the magnetic field formed by the magnet and including adjusting means for varying the magnetic reluctance between the magnetic yoke and the magnet at a position which is opposite the position of the plurality of magnetic resonance elements. The magnetic reluctance can be varied to arrive at the desired strength of the magnetic field.

Abstract: An improved loop coupled YIG resonator has a coupling loop of three sections, a loop section partially encircling a YIG resonator, and two straight end sections. The end sections together with a ground plane enclosing one end of the resonator cavity form a transmission line, the characteristic impedance of which is determined by the distance of the end section above the ground plane. The characteristic impedance is chosen to match the transmission line input to which the coupling loop is connected.

Abstract: A quadruple tuned 400 MHz IF filter comprises a rectangular substrate having a foil pattern of four inductors formed on one side thereof with four leadless capacitors and three lead type coupling capacitors interconnected between the inductors and the foil to form a filter. The inductors are arranged in a generally U-shaped configuration with the input inductor and output inductor being located at the legs of the U adjacent to each other for providing electromagnetic coupling between the input and output of the filter to sharpen the response of the filter along the skirts of the response curve. A triple tuned filter includes three helical resonators that are coupled by mutual stray capacitances. Output to input coupling is achieved with two wires connected to the input and output helical resonators and positioned adjacent to the middle helical resonator.

Abstract: A radio frequency (rf) coil for an NMR device is disclosed in which at least two active sections each have a ground end connected to a common potential and a drive end opposite the ground end. The rf coil also includes at least one transmission line section for coupling the drive ends of two of the active sections. The coil is tuned to a resonant frequency by a variable capacitor connected to the drive end of one of the active sections. Two active sections may be arranged opposite each other about an axis and connected by a half wavelength transmission line to provide a linearly polarized magnetic field. Four active sections may be arranged 90.degree. apart from each other in a quadrature coil to provide a circularly polarized magnetic field. Each active section may include two wires, each connected at one end to a lower ground ring and having an opposite end adjacent an upper ground ring which provides a ground plane.

Abstract: A slotted line tunable microwave filter of the type having a metallic layer aving slot patterns thereon, and an insulating layer, the filter also including a variable bias D.C. magnetic field source, for imposing a magnetic field on a dielectric junction in the metallic layer, which may be varied to tune the filter resonant frequency.In one embodiment of the invention the slot pattern comprises a first set of slots and a second set of slots.The first set of slots comprises a first slot disposed coincident with a negative x axis and the second set of slots comprises a second slot disposed coincident with a positive x axis.

Abstract: A high frequency tuning filter having a grounding conductive layer on one side of a dielectric substrate and figure eight (8)-shaped resonance electrodes of an electrically conductive film layer on the other side is improved into a variable tuning filter for a high frequency circuit which has a plurality of resonators surrounded by figure 8-shaped grooves respectively which are each formed in the electrically conductive layer in such a manner that a portion of an electrically conductive layer small in width remains in the figure 8-shaped groove and the electrically conductive layer remains between the adjacent resonators, and which also has a region formed by removing a part of the grounding conductive layer over the resonators.

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: Coaxial filter having at least one of the internal and external conductors which is divided into sections (S.sub.1 to S.sub.4) separated by breaks having to form of annular slits whose thickness is very slight in relation to the wavelength.Each section comprises at least one reactive tuning element such as an open or short-circuited coaxial line portion and at least one switch element located in the vicinity of the corresponding break in order selectivity to short-circuit the said break or bring about the insertion of the corresponding reactive tuning element in response to electronic control devices.Application to telecommuncations.

Abstract: A capacitively shortened coaxial resonator for making nuclear magnetic resonance measurements includes inner and outer concentrically arranged metal cylinders. The cylinders define therebetween a sample region and are shorted electrically by a conductive cap which closes one end of the inner and outer cylinders. A capacitor is connected across the cylinders at the opposite open end and functions to resonate with the inductance of a coaxial conductor formed by the short circuited cylinders. Samples placed in the sample region are mounted on an air bearing and rotated by means of air holes formed in the inner and outer cylinders.

Abstract: An input signal is supplied to a first port of a non-reversible circuit and those frequency components of the input signal applied to a second port of the non-reversible circuit which differ from the resonance frequency of a resonance element connected to the second port are absorbed by a resistive terminating element connected to the second port. On the other hand, a frequency component of the input signal which coincides with the resonance frequency is derived at the third port of the non-reversible circuit. By changing the resonance frequency of the resonance element, the frequency component of the input signal which are provided to the third port can be altered.

Abstract: A microwave tuned cavity has a strip of temperature sensitive bi-metallic material plated with silver attached at one end to the inner surface for the tuned cavity and having its other end extending at an inclined angle to the center of the volume bounded by the inner surface of the tuned cavity. The housing of the tuned cavity expands as its temperature increases, tending to cause the resonant frequency of the cavity to decrease. The strip of bi-metallic material bends slightly as the temperature increases, causing its free end to move toward the surface on which the strip is mounted. This decreases the amount of capacitive loading of the resonant signal in the cavity, tending to increase the resonant frequency caused by thermal expansion of the housing. When the temperature decreases, the free end of the bi-metallic strip moves slightly toward the center of the cavity, thereby compensating for slight thermal contraction of the walls due to the decrease in temperature.

Abstract: A single hybrid junction discriminator is described for operation over a wide operating frequency range. The single hybrid discriminator uses a transmission line, phase shifters and fixed short circuits in providing a resonant cavity in the discriminator element to form a device that will measure near carrier frequency modulated noise on a carrier frequency. Only a minimum exchange of circuit components is required for changed carrier frequencies. With the phase shifter located in the signal channel, operation is a direct and easy process for quadrature detection. Component arrangement is critical to the operation of the single hybrid discriminator. The single hybrid discriminator is more sensitive than either the two hybrid or one hybrid and a directional coupler type discriminator because better usage is made of the available signal power.

Abstract: A dielectric filter in which a plurality of holes are made at predetermined intervals in a dielectric block of small dielectric loss, and a conductor film is formed on the surface of the dielectric block including the interior surfaces of the holes to constitute resonators using the conductor film on the interior surface of each hole as an inner conductor of the resonator and the conductive film on the outer peripheral surface of the dielectric block as an outer conductor, the resonance frequency of the resonators being based on the depth of each hole.

Abstract: A harmonic filtering device placed in a high frequency line connecting a radio transmitter to its load with at least one cell in parallel on the line, constituted by an anti-resonant circuit (at the transmission frequency of the transmitter) in series with a resistor, whose value is approximately 1/20th of the characteristic impedance of the line. This cell is made of a coaxial line with four conductors in which inset elements (short-circuit, capacitor, load) form the inductor and the capacitor of the anti-resonant circuit and the resistor. The resistor of this cell has no effect at the transmission frequency of the transmitter and creates insulation between the load and the transmitter for harmonic frequencies.

Abstract: A filter assembly for UHF or microwave frequency range includes a bottom cover plate, a top cover plate and an unitary cast multicell frame with each cell having a resonating rod integrally cast with the frame. Selected ones of the rod have taps which have been cast as integral parts of the single integrally cast multicell. Each tap may include a web cast as an integral part of the unitary cast frame, the webs being dimensioned to adjust the impedance ratio of RF energy coupled to the corresponding cell. The exterior of the top cover plate may have recesses adapted to receive circuit boards therein so that the taps to the resonating rods extending through the frame can be directly connected to the terminal of the circuit boards to eliminate cables to the circuits from the taps.