Abstract: A dielectric resonator capable of adjusting a resonance frequency, reducing occurrence of a mode jump if it is applied to an oscillator and being manufactured at a low cost. The dielectric resonator has a pair of upper and lower opposing conductive plates; a dielectric substrate disposed between the conductive plates; a first electrode formed on one surface of the dielectric substrate, the first electrode having a first opening; a second electrode formed on another surface of the dielectric substrate, the second electrode having a second opening corresponding to the first opening so that a resonator is formed by a portion of the dielectric substrate disposed between the first and second openings; and a variable capacitor located in a portion of the dielectric substrate in which an applied electromagnetic field is confined in and around the resonator.

Abstract: The invention relates to a lumped-constant resonator construction, and a method for adjusting a lumped-constant resonator construction. The lumped-constant resonator construction comprises at least one, preferably ceramic substrate (4), at least one capacitance means (5), and at least one inductance means (6). The capacitance means and the inductance means (6) are clearly locatable separately but operatively connected. The inductance means (6) comprises a conductive coating (11). In the lumped-constant resonator construction according to the invention, the inductance means (6) which comprises the conductive coating (11) and which is locatable separately from the capacitance means (5) is provided on a preferably bar-like ceramic body (7) mounted on the substrate (4).

Abstract: An inductive tuning disk for tuning a resonant frequency of a resonator of a microwave filter. The microwave filter includes a housing that encloses a cavity and a resonator therein. The resonator exhibits a magnetic field that appears in the cavity. The inductive tuning disk includes a dielectric base which is supported from a top wall of the housing by a support, and which is disposed within the cavity at an adjustable height above the resonator. The inductive tuning disk further includes an inductor ring which is disposed over a portion of a top surface of the dielectric base, and which is spaced apart from a center of the base. The inductor ring includes an electrically conductive material. The inductor ring interacts with the magnetic field to cause a resonant frequency of the resonator to vary as a function of the adjustable height. The disk may also be used to couple the magnetic energy between a pair of resonators of a filter.

Abstract: It is desirable to broaden a frequency adjusting range of a resonator, or an adjusting range of a coupling coefficient between two resonators, even in a downsized TM mode dielectric resonator by enhancing a ratio of frequency change relative to an amount of movement of a frequency adjusting dielectric rod, a frequency adjusting hole is formed in a direction orthogonal to a direction of an electric field which exists in a dielectric pillar at resonance, and a void is extended from the frequency adjusting hole in a direction that is orthogonal both to the electric field and also to the frequency adjusting hole. Thus the frequency adjusting range or the adjusting range of the coupling coefficient can be broadened even in a downsized TM mode dielectric resonator, even when the dielectric rod has a limited range of movement, without substantially enlarging the frequency adjusting dielectric rod.

Abstract: A dielectric resonator including a resonator disc, and a frequency controller, composed of an electrically conductive adjustment plate, and a dielectric adjustment body, which are movable by means of an adjustment mechanism with respect to a planar surface or planar surfaces of the resonator disc. In one embodiment a conductive adjustment plate and a dielectric adjustment plate are situated on opposite sides of the resonator disc. In another embodiment, one or more dielectric adjustment bodies are attached to an electrically conductive adjustment plate to form a hybrid structure. In both embodiments, the conductive adjustment plate and the dielectric adjustment plate or adjustment body are dimensioned and selected so that they have frequency adjustment curves which are substantially similar, but opposite with regard to their slopes of adjustment, so that the combined curve of frequency adjustment of the frequency controller is substantially linear.

Abstract: A frequency adjustment mechanism for a dielectric resonator in which a change of a unloaded Q is small by adjustment of a resonating frequency, a tuning rod may be stably fixed in place after the adjustment without using any adhesives or the like and it is possible to readily perform the re-adjustment. A hole 14 is provided at an axially central portion of the dielectric resonator 11 and the tuning rod 15 is threadingly inserted into the hole 14. A female screw thread 14a is formed in an inner circumferential surface of the hole 14, and a male screw thread 15a is formed on an outer circumferential surface of the tuning rod 15. Resin layers 16 and 17 are formed on surfaces of the female screw thread 14a and the male screw thread 15a, respectively. The tuning rod 15 is made of dielectric material having a low loss and a high dielectric constant. The resin layers 16 and 17 are made of resin material having an elasticity and a low loss.

Abstract: The invention relates to a resonator structure and radio frequency filter in which the resonating frequency of a transmission line resonator can be switched in a stepwise manner between at least three values. The switching is implemented as follows: a regulating element including a switch that has at least three states is arranged in connection with the resonator. The three states of the switch correspond to different values of the specific impedance and, hence, the resonating frequency of the transmission line resonator. The regulating element is in accordance with a known arrangement: it may be e.g. a coupling element formed of a strip line on the surface of a low-loss substrate or ceramic, or a side circuit including a capacitive and inductive element, coupled to the resonator.

Abstract: An inductive element having a selectable inductive value is connectable to a differential circuit. The inductive element is formed of transmission lines, and the inductive value of the inductive element is altered by trimming away portions of the transmission line while maintaining the inductive element in balance with the differential circuit.

Abstract: A high frequency ceramic waveguide bandpass filter (100) having: two or more waveguide resonators (102) stacked vertically, each adjacent waveguide resonator is coupled with a shunt capacitance, and includes: a plate of dielectric material having a top planar surface (108), a bottom planar surface (110), and four side surfaces (112, 114, 116 and 118); a metallized receptacle (120) on the planar surface (108) and the bottom planar surface (110), the metallized receptacles (120) defining capacitive probes; a metallization layer on substantially all the surfaces of the resonators (102) with the exception of an unmetallized area (124, 126) surrounding the capacitive probes; and the resonators (102) having a conductive interface adapted to electrically connect to an adjacent resonator.

Abstract: The invention provides a trimmable multi-terminal capacitor. The multi-terminal capacitor comprises a plurality of capacitors with each of the capacitors having a common terminal. The capacitors are formed on a layer of dielectric material having a common plate of conductive material disposed on its top surface, and a plurality of separate plates of conductive material disposed on its lower surface. The capacitance value of each of the capacitors is separately tunable to tight tolerances. The capacitor is particularly suited to be used in a voltage controlled oscillator (VCO) to couple a plurality of devices to a resonator.

Abstract: A resonance inductor of a resonant circuit is formed of a chip inductor and an inductance fine adjustment pattern. A resonance capacitor is formed of a plurality of chip layered capacitors connected in parallel to each other via connection patterns formed on a substrate. The connection patterns are sequentially disconnected to adjust the capacitance of the resonance capacitor. Then, the inductance fine adjustment pattern is partially removed to adjust the inductance of the resonance inductor.

Abstract: A dielectric resonator including a cylindrical dielectric resonator body having a concentric cylindrical recess. A resonance frequency controller includes an adjustment mechanism and a cylindrical dielectric adjustment body which is movable by means of the adjustment mechanism in the axial direction inside the recess of the resonator body for adjusting the resonance frequency. The frequency controller further includes a dielectric fine adjustment body attached to the adjustment mechanism and arranged inside the adjustment body so that the projection of the fine adjustment body at the end of the adjustment body within the recess in the resonator body can be adjusted by a movement of the adjustment mechanism. Thus, the frequency controller has two slopes of adjustment, whereby the adjustment is fast owing to the movement of both adjustment bodies and also extremely accurate owing to the fine adjustment function, which is achieved when the smaller adjustment body is moved alone.

Abstract: In a TM dual mode dielectric resonator apparatus including a cross-shaped TM dual mode dielectric resonator provided in an electrically conductive case, the cross-shaped dielectric resonator being comprised of first and second dielectric resonators, mode coupling means such as at least one groove or the like for coupling an operation of the first dielectric resonator with that of the second dielectric resonator is formed in the TM dual mode dielectric resonator. At least one first projection of a dielectric material for adjusting a coupling coefficient between the two dielectric resonators is formed on a portion of the crossing portion, wherein an adjustment amount of the coupling coefficient when the first projection is removed is previously determined.

Abstract: A high-frequency circuit device includes a varactor diode having a first terminal and a second terminal, a first strip line connected to the first terminal of the varactor diode, a voltage being applied to the varactor diode via the first terminal, a second strip line having a first end connected to the second terminal of the varactor diode, and a second open end. The second strip line has a length so as to obtain an equivalent strip line length taking into capacitances of the varactor diode and the second strip line. The equivalent strip line length determines a characteristic of the high-frequency circuit device.

Abstract: A dielectric resonator including a dielectric resonator disc, a frequency controller including an adjustment mechanism and a dielectric adjustment plate, which is substantially parallel with the resonator disc, and movable means of the adjustment mechanism in the perpendicular direction with respect to the resonator disc for adjusting the resonance frequency. The frequency adjuster includes a plurality of dielectric adjustment plates, which are substantially installed concentrically and parallel one after another. The mechanical engagement of the plates with each other and with the adjustment mechanism enabling movement of the adjustment plates both with respect to the resonator disc and to each other, so that the adjustment plates are arranged in layers on top of each other as the adjusting movement is proceeding. This results in improved linearity of frequency control and a longer adjustment distance, which both improve the adjustment accuracy.

Abstract: A force and/or motion generating arrangement comprises a body (16) of magnetostrictive material and means (10, 17) for feeding a magnetic flux through said body. Said means (10, 17) comprise a pair of opposite pole surfaces (14), which are located at a short distance from each other, said pole surfaces being connected to a source (17) of said magnetic flux and defining a gap (15) for receiving said body (16) therebetween and being arranged to feed the magnetic flux through said body (16) in a first direction (x), in which said body (16) has small dimensions in relation to its dimensions in at least one other direction (y), which is substantially perpendicular to said first direction and in which the body (16) may be brought to apply a force on and/or impart a motion to another object (19).

Abstract: A tunable microwave resonator, including walls delimiting a cavity, the walls including a first wall formed with an opening; a tuning screw extending in the opening, a cylindrical dielectric resonator disposed in the cavity, and a dielectric support projecting in the opening, the dielectric support acting as a spacer and rigidly connecting the dielectric resonator to the tuning screw. The cavity and the dielectric resonator are excitable in one or more resonant modes of an electromagnetic field, wherein a current induced by the resonant modes is transferred outside the cavity; and a toroidal extension formed on the first wall inside the cavity and surrounding the opening, the toroidal extension extending a given length inside the cavity, the toroidal extension reducing a thermal effect on the resonance frequency, and increasing mechanical stability.

Abstract: A dielectric resonator including a dielectric resonator body and a frequency controller for adjusting the resonance frequency by moving a conductive metal plane in the vicinity of the dielectric resonator body. The frequency controller has a cylindrical supporting block connected to a casing, and a second cylindrical supporting block gliding telescopically inside it by means of friction surfaces. To this second cylindrical supporting block, a ring-shaped conductive adjustment plane is connected. A second conductive adjustment plane, in turn, is connected to the adjustment mechanism and arranged in a center hole of the ring-shaped adjustment plane and attached to the second supporting block in a manner which transfers the movement of the adjustment mechanism so that it first moves the second adjustment plane for a predetermined adjustment range, and thereafter both adjustment planes together.

Abstract: A dielectric resonator including a dielectric cylindrical resonator disc, and a resonance frequency controller. The frequency controller includes a dielectric cylindrical adjustment disc provided on the resonator disc so that the adjustment disc is movable in the radial direction for controlling the resonance frequency of the resonator. The frequency controller further includes a dielectric fine adjustment disc, provided on the adjustment disc so that the fine adjustment disc is movable by a movement of an adjustment mechanism with respect to the adjustment disc for fine adjustment of the resonance frequency. Thus, the frequency controller has two slopes of adjustment, whereby the adjustment is fast due to the movement of both adjustment discs, and also extremely accurate due to the fine adjustment function, which is achieved when the thinner adjustment disc alone is moved.

Abstract: A double TM mode dielectric resonator has a broadened adjustable range of a coupling coefficient between two resonators. A dielectric pillar has two intersecting dielectric members in a space surrounded by a conductor, for guiding electric fields in an even mode and an odd mode in a resonance condition; a pair of coupling adjusting holes formed at respective intersections of the dielectric members in a direction orthogonal to a plane defined by the dielectric members; and a pair of coupling adjusting dielectric rods disposed respectively in the coupling adjusting holes for movement into and out of the coupling adjusting holes. The resonator may further have a pair of voids, each provided in a respective coupling adjusting hole and extending therefrom in a direction substantially orthogonal to a direction of an electric field passing through the respective coupling adjusting hole in the resonance condition, and also orthogonal to a direction in which the respective coupling adjusting hole extends.

Abstract: An advantageous embodiment of the invention is the filter of the receiver branch of the duplex filter in a multi-channel radio transmitter/receiver having reception and transmission bands composed of plural radio-frequency channels. In the first state of the filter, when the radio transmitter/receiver is only receiving radio signals, the width of the pass band of the filter corresponds to said reception band. In the second state, in which the radio transmitter/receiver additionally transmits radio signals, the pass band of the filter is switched by current control to cover only part of the reception band. By constructing the filter in the manner proposed it is possible to use current control in the first resonator in the filter of the receiver branch. Because of its power consumption current control is otherwise unsuitable for use in e.g. the duplex filter of a portable radio-telephone.

Abstract: A filter including a cavity, a resonator structure and having a plastic resonator support and plastic tuning assembly suitable for both manual and automatic tuning applications. The dielectric resonator structure comprises a substantially cylindrical ceramic resonator, and a plastic support having a plurality of spaced apart elements diverging from a shoulder of the plastic support, each of the elements terminating in a cantilevered stop, the cantilevered stops holding the ceramic resonator in a fixed relationship with respect to the plastic support and the cavity. A resonator tuning assembly is provided that comprises a substantially cylindrical ceramic tuning element and a plastic tuning shaft having a coupling means at a first end and being threaded along a portion of its length. A ceramic tuning element is affixed to the shaft at a second end.

Abstract: The present invention relates to a radio frequency filter the resonators (6,7) of which are made up of a wire wound into a cylindrical coil comprising a number of turns and of a surrounding casing (41). Finger-like projections (3) of an insulating plate (1) support the conical coils from the inside, and the coupling to the resonator is from a microstrip line (8), at a tap point (21), on the insulating plate. Each cylindrical coil has, adjoining the first turn, a straight portion (2) which is parallel to the axis of the cylindrical coil and extends towards the bottom plate (44) of the filter. On the inside surface of the bottom plate (44) there is a lead (51) one end (E) of which is short-circuited and the other end open, and the tip (12) of the straight portion (2) adjoining the cylindrical coil (6) is in contact with this lead (51).

Abstract: An impedance adjustment capacitor connected in parallel to a choke coil formed by a conductive pattern formed on a substrate adjusts the impedance of a control voltage applying circuit. A control voltage is applied via the choke coil to a variable capacitance diode included in a resonance circuit. This control voltage determines a resonance frequency.

Abstract: An oscillator (100) includes a resonator (218) having a mirco-strip (217). The micro-strip (217) couples an inductive component (221) to a capacitive portion (219). To tune the oscillator (100), a number of cuts are made on the pad (221) in order to restrict the signal flow. The width of these cuts determine the degree of restriction posed on the signal flow. This controllable restriction of the signal flow provides the circuit (100) with enhanced tunability.

Abstract: A notch filter includes a directional coupler (16) with an input port (17a), coupled output port (17b), coupled 0.degree. (17d) and direct 90.degree. (17c) ports. A cylindrical dielectric resonator (40) is supported by a spacer (58) above a ground plane (14) and dielectric substrate (12). A first microstrip transmission line includes a strip conductor (22) coupled at one end to the coupled 0.degree. port, and extending parallel to a tangent to the edge of the resonator at a central plane (44), terminating in an open-circuit (226). A second transmission line includes a strip conductor (24) coupled to the direct 90.degree. port (17c) and extending parallel to the first transmission line, on the other side of the resonator. The first and second transmission lines each have an electrical length .lambda./4 between the central plane (44) and their open-circuit terminations, to reflect a high current to the plane.

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: The design of a high Tc superconducting band reject tunable ferroelectric filter (TFF) is presented. The band reject TFF consists of a main microstrip line on a dielectric substrate. One or more half wavelength microstrip resonators, on a ferroelectric substrate, is coupled to the main microstrip line. At a resonant frequency of a resonator, a short circuit is presented on the main microstrip line resulting in a rejection of signal of that frequency. By applying a bias voltage to a resonator, the frequency of the resonator and, as such, the reject band of the filter is changed. Different resonators can be tuned to different frequencies.

Abstract: A voltage-controlled microwave oscillator having a field effect transistor (1) as an amplifier and having a varactor diode (2) as a frequency-determining element has high output power and a large enough frequency sweep in the microwave frequency range that S-parameter scatters of the active components have optimally little influence on the characteristic data of the oscillator. The varactor diode (2) is preceded by a tunable micro stripline filter (3) and the source electrode of the field effect transistor (1) is directly connected to ground in order to form a parallel feedback with the micro stripline filter (3).

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 routing barium-ferrite tuned resonator filter integrated with an image-enhanced, single-balanced mixer. The barium-ferrite tuned resonator filter is preferably a four-sphere barium-ferrite tuned preselector which is integrated with a harmonically mixed, image-enhanced, single-balanced mixer to provide a high level of dynamic range in a harmonically mixed front end. An input resonator of the preselector in combination with a dual PIN diode switch switches low-frequency input signals (e.g., 0 to 26.5 GHz) to a low-frequency output. For high-frequency input signals (e.g., 26.5 to 50 GHz), the four-sphere barium-ferrite tuned preselector is combined with the image-enhanced, single-balanced mixer which incorporates a GaAs monolithic diode bridge integrated circuit. This provides a front end component of a high-performance portable spectrum analyzer.

Abstract: A method of manufacturing a varactor circuit and a varactor circuit for tuning a dielectric resonator oscillator (DRO). The circuit pattern for the varactor circuit includes a minimum circuit pattern that is common to several circuit patterns for the varactor circuit that compensate for non-linearities in a connected non-linear varactor and provide the desired characteristics for the DRO. Other portions of the several circuit patterns are provided in isolated elements, each of which has a size and shape so that it does not resonate within the DRO's operating frequencies. The isolated elements are selectively connected to the minimum circuit pattern to form a suitable circuit pattern.

Abstract: A tunable microwave bandstop filter device comprises a main microwave transmission line (1), at least one filter cell comprising a coupled line segment (4) coupled to the main transmission line (1) and arranged parallel to and remotely from the latter, and also a tunable LC resonant circuit (5, 6). According to the invention, the tunable LC resonant circuit (5, 6) is placed between one of the ends of the line segment (4) and the main microwave transmission line (1).

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: A ring resonator device comprises a dielectric substrate, a back-grounded conductor attached to the dielectric substrate therebeneath, a ring-shaped conductor strip, provided on the dielectric substrate, for forming an inductance element, and a capacitive element unit provided on the dielectric substrate, for forming a capacitance element. The capacitive element unit includes a plurality of capacitive elements and the capacitive elements are arranged in a distributed way so as to be laid across both opposed sides of the ring-shaped conductor strip.

Abstract: There is disclosed a tunable notch filter which has a bandpass characteristic and where a tunable notch is added to the bandpass filter by placing a resonator outside the input or output probe of the bandpass filter. The bandpass filter is a resonant type of filter and comprises a plurality of parallel, spaced apart resonators. The tunable notch resonator is positioned near the input or output probe and operates to direct a substantial amount of energy from the filter at the frequency at which the notch resonator is tuned. In this manner a notch is created within the bandpass characteristic of the filter and which notch resonator can be tuned to provide the notch anywhere in the filter passband or above or below the band edges.

Abstract: A stripline device using at least one strip conductor and at least one ground plane separated therefrom by a dielectric substrate. The ground plane is caused to move relative to the strip conductor so as to change the propagation velocity of the stripline device. In a particular embodiment, a layer of piezoelectric material is positioned adjacent the ground plane and a voltage applied to the piezoelectric layer causes its dimensions to change and provide a changing air gap between the substrate and the ground plane to change the propagation velocity accordingly.

Abstract: A microwave resonator includes a superconducting signal conductor formed on a first dielectric substrate, and a superconducting ground conductor formed on a second dielectric substrate. The first dielectric substrate is stacked on the superconducting ground conductor of the second dielectric substrate. A temperature adjustable heater is mounted near to the second dielectric substrate, so that the resonating frequency .function..sub.o of the microwave resonator can be easily adjusted by controlling the temperature of the superconducting conductors by the adjustable heater.

Abstract: A microwave resonator includes a superconducting signal conductor formed on a first dielectric substrate, and a superconducting ground conductor formed on a second dielectric substrate. The first dielectric substrate is stacked on the superconducting ground conductor of the second dielectric substrate. A rod is adjustably provided to be able to penetrate into an electromagnetic field created by a microwave propagation through the superconducting signal conductor, so that the resonating frequency .function..sub.0 of the microwave resonator can be easily adjusted by controlling the position of a tip end of the rod.

Abstract: A filter utilizes a frequency selective, non-conductive, dielectric structure for filtering electromagnetic energy in the millimeter to far infrared frequency bands. The filter includes a non-conductive, high-dielectric, background material positioned to receive incident electromagnetic energy. A lattice structure comprised of a plurality of elongated elements formed of a non-conductive, high-dielectric material are disposed in a two-dimensional, periodic arrangement in the background material. The elements extend in parallel to one another through the background material for providing a range of frequencies over a band gap in which incident electromagnetic energy within the frequency range of the band gap is substantially prevented from propagating through the lattice structure. The dielectric structure can be adapted to operate as a band stop filter or a low pass filter.

Abstract: A multi-cavity dielectric filter 30 having a single housing 32 for a plurality of resonant cavities 65. The dielectric filter 30 has a plurality of dielectric resonators 42 placed inside housing 32, instead of in individual housings, wherein the resonators 42 are spaced a quarter wave apart and are electrically isolated from one another by conductive isolation plates 44 positioned therebetween. The isolation plates 44 do not make continuous mechanical contact with the interior conducting surface of housing 32, but rather are spaced from the inner surface 77 of housing 32, thereby making assembly of the filter much simpler than if a solid RF connection had to be made. The resonators 42 are positioned inside the housing 32 between the isolation plates 44 and are supported by low loss, low dielectric constant spacers 46. End walls 59 complete the cavity formation at the termination ends 79 of housing 32.

Abstract: A microstrip filter having a plurality of parallel resonant conductors mounted on a dielectric substrate is tuned by applying a portion of a hot-melt type glue to the filter surface. The glue is melted and then deposited on the conductors and spread across and along the conductors until the filter has a desired frequency response. The glue is then cooled until it becomes solid.

Abstract: A dielectric resonator structure includes a resonator made of a dielectric material. The resonator is supported between two support plates and can be displaced at least in one direction between the plates. At least one of the plates is made of a dielectric material so that the amount of the dielectric material of the support plate varies in the direction of displacement of the resonator.

Abstract: A helix resonator comprises a printed board (1) made of dielectric material, a resonator coil (2) having a high impedance end and a low impedance end and mounted on the printed board and formed by a conductor wound several turns to form a cylindrical coil, an electrically conducting cover (6) surrounding the resonator coil (2), and on the surface of the printed board a strip line (4) of electrically conducting material electrically coupled to the last or second last turn of the resonator coil (2) near the high impedance end.

Abstract: A dielectric resonator apparatus is provided with a dielectric resonator which has a generally spherical dielectric placed within a shield case having a rectangular cavity, and uses each resonance of a x mode, a y mode and a z mode of TE.sub.101, where an electric field is caused respectively around a x axis, a y axis and a z axis of a rectangular coordinate system predetermined in the dielectric, and an external coupling means for coupling the above described resonator to an external circuit, whereby the dielectric resonator apparatus, which has no-load Q larger than in the conventional embodiment, can be made smaller in size, and also, can realize three resonators with one apparatus.

Abstract: Disclosed is a TEM mode resonator having as a means for adjusting the resonance frequency a simple frequency adjusting mechanism appropriate for size reduction while permitting easy mounting of a varactor diode for varying the resonance frequency thereto. Below a strip transmission line 2 is provided a slot 7 having a length L perpendicular to the transmission line as located at an outer ground conductor surface 3 of a one-fourth wavelength type microstrip line resonator having its one end short-circuited. According as increasing the slot length L, the resonance frequency of the resonator reduces, which characteristic is utilized as a means for adjusting the resonance frequency. By connecting a varactor diode at a center portion of the slot line and varying the voltage applied to the diode, the resonance frequency can be varied.

Abstract: The invention relates to a dielectric resonator (3) comprising two cylindrical discs made of a dielectric material. In the invention, the discs (3A,3B) are positioned with their planar surfaces against each other, so that they are radially displaceable with respect to each other for varying the shape of the resonator (3) and for adjusting the resonance frequency (3).

Abstract: A mechanism for adjusting the resonance frequency of a dielectric resonator having TE.sub.01.delta. mode as its operation mode under the presence of the electromagnetic field including: a hole extending along the axis of the dielectric resonator; a tuning bar, made of a dielectric material of a low loss, having a male screw formed on the peripheral surface thereof; and a female screw, to engage the male screw, formed on the wall of the hole. The tuning bar is reciprocated in the hole with the tuning bar engaging the hole so as to adjust the resonance frequency.

Abstract: A low loss, fast switching, electronically tunable filter circuit which is microstrip compatible is obtained through the use of a resonant ring structure having two couplers, a low noise amplifier and a variable phase shifter. The tunable filter may advantageously be used in the receive channel of a transmit/receive module for phased arrays wherein the resonant frequency of the ring can be tuned anywhere in the operating frequency range so as to increase the dynamic range of the receiver.

Abstract: An arrangement for coupling microwave energy with a reaction chamber, including electrically stable tuning and being, within limits, tolerant against changes in critical dimensions and power fluctuations. A coaxial line between a hollow waveguide and the reaction chamber is of such a structure that it forms, at least together with the reaction chamber, a loss resonator for the microwave frequency employed. The coaxial line can comprise an absorber or, alternatively, can be made of a poorly conductive material. There is also the possibility of downgrading the quality of the resonator by leaving an annular gap between a metal plate and an outer conductor section.