Abstract: There is a manufacturing limit on how small ceramic coaxial resonators can be produced, which leads to a limit on the frequency of resonance for these resonators. One technique to double the effective frequency of a ceramic coaxial resonator is to couple each end of a resonator to a Colpitts oscillator, the oscillators being balanced and out-of-phase by 180°. During operation, the resonator is effectively divided in half with a virtual ground forming in the center. This allows a single resonator to operate as two resonators of half the original size. Hence, the oscillation frequency for each of these balanced oscillators is doubled when compared to the frequency of similar oscillators that have separate ceramic coaxial resonators of similar size.

Abstract: A dielectric resonator system having a dielectric element and a purified alumina attachment assembly both housed within a metallic resonant casing. Attachment assembly is at least 99.5% pure alumina. Attachment assembly couples dielectric element to the casing. Dielectric element is an internally threaded ring or disk. Attachment assembly includes an externally threaded alumina support member coupled to the internally threaded dielectric element.

Abstract: A dielectric resonator includes a cavity member formed of an electrically conductive material and a dielectric core disposed in the cavity member. The resistance against heat cycle fatigue in bonding portions between the dielectric core and the cavity member is enhanced without causing increases in material cost and production cost. An electrode is formed on each end face of the dielectric case, or on the end face of each flange portion of the dielectric core. A metal foil having a cover portion for covering each end face, and having a spring portion which may be bent along the outer edge of the flange portion is connected to the dielectric core by bonding the cover portion of the metal foil to the end face using an electrically conductive adhesive. Thereafter, the spring portion of the metal foil is soldered to the inner surface of the cavity wall. The metal foil has a portion raised toward the inner surface of the cavity wall, and the inside of the raised portion is filled with an adhesive.

Abstract: The present invention provides a high frequency dielectric filter which can realize high stability, the least loss of functionality, and mass-productiveness. In a high frequency dielectric filter adopting a TM mode, a resonator fixing plate 3 is used for fixing a dielectric resonator 2 and a case 1 and hence, they are firmly fixed both in the longitudinal direction and the lateral direction of the resonator. Accordingly, a high frequency dielectric filter which is stable against vibration and impact is provided.

Abstract: A resonator having a variable resonance frequency. The resonator includes a cavity enclosed by a conducting wall. A resonating element and a conductive plate are located within the cavity. A photoconductive element is connected between two points on the conductive plate. The resonator also includes a light source for irradiating the photoconductive element with light of the predetermined wavelength. In the preferred embodiment, the conductive plate is circular and includes a gap, the photoconductive element connecting two points on the gap and the resonating element is a cylindrical dielectric resonator element having a TE01&dgr; mode electromagnetic field distribution. The circular conductive plate is preferably placed parallel to the top surface of the cylindrical dielectric resonator substantially midway between the top surface and the inner surface of the conducting wall. The diameter of the circular plate is preferably greater than that of the cylindrical dielectric resonator.

Abstract: Plural resonators formed on a dielectric substrate constitute a filter. The resonant frequency of each resonator is adjusted to a target frequency by accumulating dielectric material on the resonator. The degree of such adjustment is substantially proportional to the amount of the dielectric material. The resonators are originally designed to have a resonant frequency that is a little higher than the target frequency. The resonant frequency of each resonator deviates from the designed target because of various factors in manufacturing processes. Each resonant frequency is measured, its deviation from the target is calculated, and the amount of the dielectric material required to eliminate such deviation is determined before the adjustment process. Accordingly, the adjustment is easily performed without measuring the resonant frequency during the adjustment process.

Abstract: A filter of microwave and millimetric bands with spurious characteristic controlled is disclosed. A filter circuit on a top surface of the substrate including resonators electromagnetically resonating and coupled at a resonance frequency at a microwave band and a millimeter wave band, for filtering an input signal from the connectors through the resonator and outputting the filtered signal through the connector. The filter circuit is contained in a metal box including a top plate confronting the top surface and the filter circuit, side walls, and a bottom plate. An inside surface of the top plate has a shape other than a flat plane to control the spurious characteristic, that is, a protrusion. The bottom plate of the metal box may be coalesced. The spurious characteristic may be controlled by a hollow portion in the top plate. The protruding portion may be provided to the side walls. The spurious frequency may be controlled by a dielectric plate in the space in the shielding.

Abstract: There is a manufacturing limit on how small ceramic coaxial resonators can be produced, which leads to a limit on the frequency of resonance for these resonators. One technique to quadruple the effective frequency of a ceramic coaxial resonator is to couple four resonators into a ring configuration, each of the resonators having an electrical length of 90°. Further, each of the resonators has an amplifier coupled in parallel, these amplifiers having phase shifts approximately equal to 90° and further being controlled by a tuning voltage VTUNE. In operation, four oscillation signals are generated at the same frequency but out-of-phase by a factor of 90°. When combined, the resulting signal is an oscillation signal at four times the frequency of the original oscillation signals. At the same time, one of the oscillation signals used in the combination can be sampled and be used for feedback purposes within a PLL-FS.

Abstract: A laminated type dielectric filter including a first stage symmetric type strip line resonator and a last stage symmetric type strip line resonator each having at least two resonating elements arranged to oppose one another via dielectric layers, said resonators being aligned in a direction perpendicular to a stacking direction in which said resonating elements are stacked, an input electrode for coupling the first stage symmetric type strip line resonator to an input terminal, an output electrode for coupling the last stage symmetric type dielectric filter to an output terminal, an earth electrode substantially surrounding an outer surface of the laminated type dielectric filter, plural interlayer earth electrodes connected to the earth electrode, and one or more coupling electrode for coupling said plural symmetric type strip line resonators, said the resonating elements, input electrode, output electrode, interlayer earth electrodes and coupling electrodes are isolated by means of dielectric layers, and el

Abstract: A coupling network and a method are described for widening the varactor diode tuning band of microstrip dielectric resonators, for instance in microwave oscillators or in filtering arrangements. The present invention substantially provides for modifying the single-line asymmetric structure of a conventional network still utilizing a single varactor diode mounted on the plane of the microstrip circuit. In other words, the transmission line is duplicated thus creating a dipole structure which assures a tighter coupling with the dielectric resonator. Thanks to the duplication of the transmission line and to the fact that the center of the dipole is the location where currents are higher, it is possible to obtain far wider tuning bands as compared with a known and conventional configuration.

Abstract: A dielectric resonator comprises electrodes formed on both the main surfaces of a dielectric substrate and a thin film multi-layer electrode of thin film conductor layers and thin film dielectric layers having fixed thickness alternately laminated which constitutes at least one of the electrodes, and is characterized in that by giving abrasive treatment or etching treatment to the external portion of the dielectric substrate and the external portion of the electrodes formed on both the main surfaces of the dielectric substrate the end portions of the electrode is made in an electrically open-circuited condition. In this way, a dielectric resonator making effective use of the characteristic of low loss of the thin film multi-layer electrode is presented.

Abstract: A dielectric duplexer or multiplexer in which a conducting film is formed on a dielectric block in a dielectric waveguide resonator, and a through-hole is formed in the dielectric block. The unloaded Q is set by selecting the outside dimensions of the dielectric block. The resonance frequency is set by selecting the size and location of the through-hole as well as the outside dimensions of the dielectric block. A terminal electrode is formed on the outer surface of the dielectric block. A coupling hole is formed in the dielectric block and a coupling electrode is formed on the inner surface of the coupling hole. One end of the coupling electrode is connected to the terminal electrode and the other end of the coupling electrode is either connected to the conducting film formed on the outer surface of the dielectric block or terminated inside the dielectric block.

Abstract: A dielectric resonator device is disclosed in which characteristics of a plane circuit type dielectric resonator device applicable to miniaturization is included; non-loading Q0f a resonator is increased so as to decrease insertion loss in the case of forming a band pass filter, or the like; reduce changes in filter characteristics with respect to changes in structural dimensions of the length of the resonator, the gap between the resonators, or the like; and increase freedom in adjustment of resonant frequency to enhance production efficiency. In this arrangement, on each main surface of a dielectric plate are disposed an electrode having mutually opposing openings, which serve as a rectangular-slot mode dielectric resonator; in which the length of the resonator is longer than the half-wave length in the resonant frequency used so as to resonate in a higher mode.

Abstract: A multiple-mode dielectric resonator in which a combined dielectric block formed of a plurality of dielectric elements combined into a crossed shape is used to cause three resonance modes along a plane defined by two of the dielectric elements, and in which the resonant frequency of each mode is determined, or a multiple-mode dielectric resonator in which the degree of coupling between predetermined resonance modes is determined. If first and third resonance modes are two TM110 modes having different lines of symmetry of electric field distributions, and if a second mode is a TM111 mode, dielectric-cut portions are formed in the combined dielectric block, for example, at positions where the electric field distribution of the first resonance mode is concentrated while the electric field distributions of the second and third resonance modes are not concentrated, thereby selectively determining the resonant frequency of the first resonance mode.

Abstract: The dielectric notch filter of the invention includes: a transmission line for transmitting a high-frequency signal; input and output terminals provided at both ends of the transmission line; a ground conductor for supplying a ground potential; and a dielectric resonator connected to the ground conductor and the transmission line. The dielectric notch filter further includes an impedance matching element connected to the ground conductor and the transmission line in parallel with the dielectric resonator. The dielectric resonator includes: a cavity connected to the ground conductor; a dielectric block provided in the cavity; a coupling device coupled with an electromagnetic field produced in the cavity; and a coupling adjusting line for connecting the coupling device to the transmission line and for adjusting the degree of electromagnetic coupling.

Abstract: The bandpass filter according to the present invention includes a housing having a plurality of cavities, wherein said plurality of cavities are isolated from each other by partitions and wherein each said partition have a coupling window; input/output connectors formed at both ends of said housing so as to pass output signals from a transmitter; coupling loops connected to said input/output connectors so as to excite an applied signal power and to combine resonance modes; dielectric resonators installed in said cavities of said housing so as to resonate a signal power transmitted from said coupling loop to the desired frequency band, said dielectric resonators including: a first resonator group formed in both said cavities which are adjacent to said coupling loops; and a second resonator group formed in said cavities which are positioned between both said cavities which are adjacent to said coupling loops, wherein said resonators of said second resonator group are stepped resonators; a plurality of frequency

Abstract: A microwave resonator comprising a cavity (7) with a dielectric resonator device (8, 11) including a movable dielectric tuning body (11), which is mechanically coupled to an electrical motor (28). The tuning body is carried by an electrically nonconductive rod (12, 13) which is provided with a resiliently biassed (19) clamping element (15) adapted to clamp the plunger (11) against a stop means (14) on the rod.

Abstract: A filter apparatus includes an enclosure defining a plurality of cavities. A pair of resonators are located in a corresponding pair of the cavities. The filter apparatus further includes an elongated coupling structure operatively interposed between the pair of resonators. The elongated coupling structure is spaced from each of those resonators uniformly along its length.

Abstract: A conducting film is formed on a dielectric block in a dielectric waveguide resonator, and a through-hole is formed in the dielectric block. The unloaded Q is set by selecting the outside dimensions of the dielectric block. The resonance frequency is set by selecting the size and location of the through-hole as well as the outside dimensions of the dielectric block. A terminal electrode is formed on the outer surface of the dielectric block. A coupling hole is formed in the dielectric block and a coupling electrode is formed on the inner surface of the coupling hole. One end of the coupling electrode is connected to the terminal electrode and the other end of the coupling electrode is either connected to the conducting film formed on the outer surface of the dielectric block or terminated inside the dielectric block. The above structure allows an increase in the degree of freedom in the design of the characteristics including the resonance frequency and unloaded Q of the dielectric waveguide resonator.

Abstract: A dielectric resonator designed so that there is substantially no loss in a conductor on the surface of a casing forming a shielded cavity, and so that the unloaded Q and the resonant frequency can be changed independently of each other. A cylindrical dielectric block having a pair of electrodes formed respectively on its two opposite surfaces is disposed in a metallic shielded-cavity casing so that one of the electrodes is in contact with an inner bottom surface of the shielded-cavity casing. This electrode is electrically connected to the shielded-cavity casing by soldering or the like. Input/output connectors are coupled to the other electrode on the cylindrical dielectric block.

Abstract: A dielectric filter provided in this invention has insertion-loss characteristics of 2 dB or lower in the range of 1 to 2% of a specific band. The dielectric filter includes an upper case and a lower case, a dielectric substrate, an electrode formed on mutually opposing surfaces thereof, and a plurality of pairs of openings formed in the electrodes on the two opposing surfaces, so as to form a plurality of dielectric resonators, and input-output couplers for coupling to each of an input-stage dielectric resonator and an output-stage dielectric resonator among the plurality of dielectric resonators. In the input-stage and output-stage dielectric resonators, the opening of the electrode is rectangular or polygonal, whereas in at least one of the dielectric resonators other than the input-stage and output-stage dielectric resonators, it is substantially circular.

Abstract: A resonator includes an insulating plate having a circular through hole, an arc-shaped conductor line formed in the periphery of the through hole and on the top face of the insulating plate or in the inner wall of the through hole, a first electrode connected to one end of the conductor line and a second electrode connected to the other end of the conductor line wherein both first electrode and the second electrode are provided on a side face of the insulating plate.

Abstract: The present invention provides a high-frequency dielectric ceramic composition having both high dielectric constant (∈r) and high Q value, and excellent temperature stability of the resonance frequency. The high-frequency dielectric ceramic composition contains a rare earth element (Ln), Mg, Ta, Ti and M (M is at least one of Ca and Sr) and has a composition represented by the composition formula aLnOx/2-bMgO-cTaO5/2-dMO-eTiO2, wherein a, b, c, d, e and x are mol % in the ranges of 0.100≦a≦0.350, 0.067≦b≦0.233, 0.033≦c≦0.117, 0.150≦d≦0.400, 0.150≦e≦0.400, a+b+c+d+e=1, and 3≦x≦4, respectively.

Abstract: A dielectric resonator filter operating in a magnetic dipole mode includes a plurality of dielectric resonators disposed in a plurality of dielectric resonator cavities. A plurality of coupling mechanism provide an in-line coupling factor between respective resonators of electrically adjacent dielectric resonator cavities. At least one cross-coupling device provides cross-coupling between respective resonators of non-adjacent dielectric resonator cavities. A magnitude and sign of the in-line coupling factors and the cross-coupling factor, provide a dielectric resonator filter, for which a desired amplitude and phase response can be provided.

Abstract: A bandpass filter having three waveguide cavities probelessly coupled in a tri-section for producing an asymmetric response about a passband. In another aspect, the bandpass filter also includes first and second waveguide tri-sections coupled in series via a common waveguide cavity, providing a bandpass waveguide filter having transmission zeroes on only one side a filter passband.

Abstract: A dielectric filter includes a case, a substrate having microstrip lines formed thereon, and a dielectric plate having non-electrode parts serving as dielectric resonators. The case includes a supporting part for supporting the lower surface of the dielectric plate and includes a side wall surrounding the side faces of the dielectric plate wherein the supporting part and the side wall are formed in an integral fashion. The substrate is bonded to the case and the dielectric plate is mounted on the supporting part of the case. A metal cover is then placed on the case such that the opening of the case is closed with the cover. In the dielectric filter constructed in the above-described manner, warping of the case for supporting the dielectric plate is suppressed and thus the stress exerted on the dielectric plate is reduced. As a result, the dielectric plate is prevented from being separated from the case and also prevented from having a crack.

Abstract: In a dielectric resonator device, electrodes having electrode non-formation sections opposite to each other and having substantially the same shape and size are formed on the opposite main faces of a dielectric plate. The portion of the dielectric plate sandwiched between the electrode non-formation sections opposite to each other is used as a dielectric resonator section. Further, the characteristics of the dielectric resonator device are adjusted by attaching dielectric chips inside of the dielectric resonator section or between adjacent dielectric resonator sections.

Abstract: The dielectric notch filter of the invention includes: a transmission line for transmitting a high-frequency signal; input and output terminals provided at both ends of the transmission line; a ground conductor for supplying a ground potential; and a dielectric resonator connected to the ground conductor and the transmission line. The dielectric notch filter further includes an impedance matching element connected to the ground conductor and the transmission line in parallel with the dielectric resonator. The dielectric resonator includes: a cavity connected to the ground conductor; a dielectric block provided in the cavity; a coupling device coupled with an electromagnetic field, produced in the cavity; and a coupling adjusting line for connecting the coupling device to the transmission line and for adjusting the degree of electromagnetic coupling.

Abstract: A tuning assembly for tuning the resonant frequency of a dielectric resonator in a cavity. The assembly includes a first resonator body (21) secured to a tubular sleeve portion (33) mounted in an opening (14a) of a mounting wall (14). The sleeve portion (33) is spring loaded so as to exert a clamping force on the first resonator body (21). A second resonator body (22) is secured to a shaft (35) which is journalled inside the tubular sleeve portion (31). The tubular sleeve portion (33) and the shaft (35) are axially slidable in relation to each other, whereby the position of one of the resonator bodies (22) is precisely adjustable in relation to the other resonator body (21).

Abstract: A dielectric filter includes a shielding cavity frame having electric conductivity, a dielectric having electrodes formed on two opposing faces and disposed in the shielding cavity frame, and external coupling means, wherein the external coupling means includes an electric probe at least a part of which is covered with a covering dielectric.

Abstract: A dielectric resonator including a substantially columnar dielectric, thin film multi-layer electrodes each formed around two faces opposite to each other of the dielectric, and a concave portion formed substantially evenly on the peripheral side-face of the dielectric.

Abstract: Electrodes are formed on respective two main surfaces of a dielectric sheet wherein each electrode has an opening formed at a location corresponding to the location of the opening formed in the other electrode. The part defined by the openings serves as a dielectric resonator. Coupling lines are formed directly in the electrode opening. Transmission lines are formed on a circuit board. The coupling lines and the corresponding transmission lines are connected to each other via bonding wires. This structure makes it possible to minimize the external Q of a resonant circuit using the dielectric resonator. If an oscillator is produced using this resonant circuit, it is possible to achieve a large frequency modulation with and large output.

Abstract: A dielectric filter includes electrodes formed on both principal surfaces of a dielectric substrate wherein each electrode has a plurality of openings which are formed so that the locations of the plurality of openings formed in one electrode disposed on one principal surface of the dielectric substrate correspond to the locations of the openings formed in the other electrode disposed on the other principal surface of the dielectric substrate. The dielectric substrate is disposed between upper and lower conductive cases. A non-electrode coupling part is formed between openings thereby coupling resonators with each other or coupling a resonator with input/output means. Thus, the invention provides a resonator which can be easily coupled to another resonator or input/output means and also provides a filter having a wide-band characteristic.

Abstract: Proposed are a resonator which can easily establish coupling with input/output means, an external circuit, etc., and a filter, duplexer and communication apparatus each having a wide-band frequency characteristic. Electrodes having polygonal openings defined therein are formed in both principal planes of a dielectric substrate such that the openings are positioned to face each other. The dielectric substrate is arranged with the aid of spacers between a metal-made upper conductor case and a lower conductor case having a shield conductor formed therein, the upper and lower conductor cases being positioned to face each other with gaps left relative to the dielectric substrate. Portions of the dielectric substrate between pairs of the openings facing to each other serve as resonance areas and are coupled respectively with input/output electrodes.

Abstract: A dielectric resonator device having characteristics of a plane circuit type dielectric resonator device applicable to miniaturization. Non-loading QD of a resonator is increased so as to decrease insertion loss in the case of forming a band pass filter, or the like. Changes in filter characteristics with respect to changes in structural dimensions of the length of the resonator, the gap between the resonators, or the like, are reduced. There is an increase in the freedom in adjustment of resonant frequency to enhance production efficiency. In this arrangement, on each main surface of a dielectric plate is disposed an electrode having mutually opposing openings, which serve as a rectangular-slot mode dielectric resonator; in which the length of the resonator is longer than a half-wave length at the resonant frequency being used so as to resonate in a higher mode.

Abstract: A dielectric resonator which is not easily influenced by vibration and can stably obtain excellent performance is disclosed.

Abstract: A dielectric resonator allowing size reduction and easy modulation of coupling between adjacent resonating sections and electrodes is provided. A configuration is such that electric conductors 2a and 2b having openings on two main faces of a dielectric substrate 2 are arranged so as to oppose each other. Electrodes 5 and 6 are respectively formed on one main face each of supporting members 3a and 3b, the supporting members 3a and 3b are arranged via spacers 9 so as to oppose each other and so as to be apart from each other with a predetermined spacing in the thickness direction of the dielectric substrate 2 for the dielectric substrate 2, first and second conductor plates 4a and 4b are arranged apart with a predetermined spacing from the supporting members 3a and 3b, and the dielectric substrate positioning between the openings opposing each other is used as a resonating section.

Abstract: A TE0&ggr;&dgr; mode dielectric resonator (12) includes a cylindrical dielectric disk (32, 32′, 32″) having top and bottom ends (20, 22) spaced apart by a closed curve wall (24). The dielectric disk has an effective dielectric constant greater than 40. An axially aligned hole (36) is formed through the disk (32) between the top and bottom ends (20, 22). A conductive wall (34, 34″) is formed at or slightly beyond the wall (24) but does not cover the top and bottom ends (20, 22). The hole (36) has a preferred diameter between 0.21 and 0.4 times the diameter of the disk (32, 32′, 32″). The disk may be configured as a heterogeneous composite of dissimilar materials which exhibit increasing dielectric constant at increasing radial distance and increasing Q at decreasing radial distance.