Abstract: A thin film resonator which combines a microstrip resonator structure and a coplanar resonator structure to form an integrated resonator structure. The resonant frequency of this resonator structure is independent of the substrate thickness within a certain thickness range. This resonator structure also has a very economical size, as compared to other existing resonator designs. Different coupling configurations between the resonators are shown with the resulting coupling coefficients. Also a two-pole, four-pole and an eight-pole filter are designed using the thin film resonator and the insertion loss and return loss characteristics for various filters are shown.

Abstract: A dielectric resonator device includes a dielectric substrate. Electrode films are formed on the front and back surfaces of the dielectric substrate, respectively. A TE010-mode resonator is constituted by two circular openings which oppose each other and which are formed in the electrode films. Two opposing slots formed in the electrode films constitute a planar dielectric transmission line (PDTL). The PDTL is connected to the TE010-mode resonator. An excitation section is formed by extending two portions of each electrode film on two side of each slot into each opening.

Abstract: A evanescent resonator device includes a short-circuited evanescent waveguide and loading capacitor. The evanescent waveguide of the resonator includes a single length of evanescent transmission line terminated in short circuit, a first support substrate having a predetermined dielectric constant, the first support substrate having a top surface and a bottom surface; a dielectrically loaded feed network including: (a) a second substrate arranged on the top surface of the first support substrate, the second substrate having a predetermined dielectric constant that is higher than the first support substrate; and (b) a metal strip arranged on an upper surface of the second substrate, so that the second substrate is arranged between the first support substrate and the second substrate. A ground plane is arranged on the bottom surface of the first support substrate, the support substrate includes a hollow metalized center area being open on an upper end closest to the second substrate.

Abstract: A printed circuit for processing radio frequency signals. The printed circuit includes a substrate. The substrate can be a meta material and can include at least one dielectric layer. The dielectric layer can have a first set of dielectric properties over a first region and a second set of dielectric properties over a second region. The dielectric permittivity and/or magnetic permeability of the second set of dielectric properties can be different than the first set of dielectric properties. The printed circuit also can include a single port resonant line and a ground coupled to the substrate. The dielectric properties can be controlled to adjust the size of the resonant line. The dielectric properties also can be controlled to adjust an impedance, quality factor and/or capacitance on the resonant line. Resonant characteristics of the resonant line can be distributed through the substrate.

Abstract: The present invention relates to a circuit for processing radio frequency signals. The resonant circuit includes a substrate. The substrate can be a meta material and can incorporate at least one substrate layer. A resonant line and at least one ground can be coupled to the substrate. An end of the resonant line can electrically shorted to the ground or electrically open with respect to ground. The substrate layer can include a first region with a first set of substrate properties and at least a second region with a second set of substrate properties. At least a portion of the resonant line can be coupled to the second region. The first and/or second set of substrate properties can be differentially modified to vary a permittivity and/or a permeability over a selected region. A third region can be provided with a third set of substrate properties as well.

Abstract: A planar resonator and method of manufacture provides contactless power transfer using at least two electrically isolated axis aligned conductive across the transfer interface in a coupled inductor or transformer configuration. Signal or power transfer is then accomplished by coupling of magnetic flux. The coupling of electric flux is also accomplished across a same interface and driven with the same conductive spiral-wound conductors. An interface of energy transfer(IOET) has a first spiral-shaped conductor arranged on the top surface of said IOET; a second spiral-shaped conductor arranged on the bottom surface of said IOET, has a vertical axis aligned with the first spiral-shaped conductor. The IOET and the first and second spiral-shaped conductors have a predetermined self-resonant frequency.

Abstract: Ring-shaped resonant elements include respectively conductor lines 2a, 2b, and 2c each formed on a substrate 1 along a full one turn of circumferential length of a ring. Each of the conductor lines 2a, 2b, and 2c has two end portions which additionally extend and which are located such that they closely adjoin each other in a width direction. The respective ring-shaped resonant elements are disposed in a concentric fashion. Capacitive parts are formed in areas in which two ends of respective conductor lines are located in close proximity to each other, and the other parts of the respective conductor lines function as inductive parts. Each conductor line operates as a half-wave transmission line whose both ends are electrically open. It is not needed to form a ground electrode on a surface of the substrate opposite to the surface on which the conductor lines are formed. Thus, a resonator can be formed using a very small number of constituent elements.

Abstract: A birdcage resonator has a pair of conductor rings separated from each other along a central axis and a plural number of axially disposed conductor rungs, which extend between the rings and are evenly spaced around the central axis. Each of the rungs has a sectional shape with thickness or a radial extension comparable to or greater than its width or its azimuthal extension. Measures of the width and thickness of the rungs may be determined by using them as parameters to calculate the values of Q factor from an analytical procedure to locate parameter value ranges corresponding to maximal Q. Geometric calculations for filling factor yield ranges of parameters providing for compromise parameter values. Saddle coils have been found to exhibit similar enhancement of Q with radially oriented conductor cross section.

Abstract: A microstrip resonator including a dielectric substrate, a resonance electrode on a first main surface of the dielectric substrate, and a ground electrode over an entire second main surface of the dielectric substrate. The resonance electrode includes a superconducting film and a metal film deposited in that order. The ground electrode includes a superconducting film and a metal film deposited in that order. The superconducting film functions as an electrode in low-temperature operation below a critical temperature, and the metal film functions as an electrode in high-temperature operation at or above the critical temperature. The length of the superconducting film of the resonance electrode is set to be longer than that of the metal film of the resonance electrode, so that the resonance frequency in low-temperature operation is substantially equal to the resonance frequency in high-temperature operation.

Abstract: A resonator, a filter, an oscillator, a duplexer, and a communication apparatus employing these devices have improved efficiency characteristics in confining an electromagnetic field in an opening of an electrode, suppressed current concentration, and minimized conductor loss. Electrode patterns are formed near short-circuited positions in a slot so that the slot will be divided into smaller-width slot lines. Consequently, the efficiency in confining the electromagnetic field is improved, and conductor loss is minimized.

Abstract: A dual-mode resonator comprises a dielectric substrate having a region divided into four quadrants, and a ring resonator forming quadrangularly symmetrical configurations within the four quadrants of the region. The symmetrical configurations may be formed from folded sections of the resonator, so that parallel lines with opposite currents that cancel to minimize the far-field radiation of the filter structures. The symmetrical configuration can also be meandered, so that opposite currents in parallel line segments within each meander and the line segments that interconnect the meanders cancel to minimize the far-field radiation of the filter structures. One resonator can be used in a two-pole dual-mode filter structures, or multiple resonators can be used in more complex dual-mode filter structures.

Abstract: In order to compensate changes in the resonant frequency of the resonator occurring owing to fluctuations in the distance between the reference distance (ds) and an actual distance (ds±&Dgr;ds) in an RF strip line resonator with a strip line (10) which is arranged at a desired distance (ds) from a metallic conductor (11), the strip line (10) is curved. This curvature induces eddy currents in the conductor (11). The eddy currents bring about a reduction in the inductance of the RF strip line resonator. The smaller/larger the distance between the strip line and the metallic conductor becomes, the smaller/larger this inductance becomes.

Abstract: A high frequency filter having steep skirt characteristics using a sapphire R-plane substrate. The filter comprises a substrate having first and second faces. The first face is a sapphire R-plane. A grounded conductive layer is formed on the second face of the substrate. A pair of input/output terminals is formed on the first face. In embodiments, hairpin-shaped resonating portions are formed between the pair of input/output terminals. Each of the resonating portions has at least one long side. Each long side of the resonating portions makes an angle of &psgr; with <11-20> direction of a sapphire substrate. The angle &psgr; satisfies relations 0°≦&psgr;≦30°. In embodiments, the resonating portions are asymetric, J-shaped, or rectangular with an opening.

Abstract: A transmission line, a resonator, a filter, a duplexer, and a communication apparatus efficiently minimize power losses due to edge effects, thereby having superior loss-reduction characteristics. A continuous line and a plurality of thin lines each having a predetermined length and branching from both sides of the continuous line are formed on a dielectric substrate. With this structure, edges of the individual thin lines substantially do not exist, so that losses due to edge effects can be efficiently minimized.

Abstract: In a method for manufacturing a filter including a plurality of resonators arranged in series, a shape of the resonators and a number of the resonators are determined, so that an amount of additional coupling coefficients between the resonators except for two adjacent ones of the resonators is smaller than a predetermined value. Then, an initial coupling coefficient function is calculated with respect to a distance between two adjacent ones of the resonators, and is set in a coupling coefficient function. Then, coupling coefficients between the resonators are calculated for desired filter frequency responses, and distances between the resonators having the calculated coupling coefficients are calculated in accordance with the coupling coefficient function. Then, a layout of the filter having the resonators with the calculated distances is designed, and a tentative filter is manufactured.

Abstract: A birdcage resonator has a pair of conductor rings separated from each other along a central axis and a plural number of axially disposed conductor rungs, which extend between the rings and are evenly spaced around the central axis. Each of the rungs has a sectional shape with thickness or a radial extension comparable to or greater than its width or its azimuthal extension. Measures of the width and thickness of the rungs may be determined by using them as parameters to calculate the values of Q factor from an analytical procedure to locate parameter value ranges corresponding to maximal Q. Geometric calculations for filling factor yield ranges of parameters providing for compromise parameter values. Saddle coils have been found to exhibit similar enhancement of Q with radially oriented conductor cross section.

Abstract: A transmission line, a resonator, a filter, a duplexer, and a communication apparatus efficiently minimize power losses due to edge effects, thereby having superior loss-reduction characteristics. A continuous line and a plurality of thin lines each having a predetermined length and branching from both sides of the continuous line are formed on a dielectric substrate. With this structure, edges of the individual thin lines substantially do not exist, so that losses due to edge effects can be efficiently minimized.

Abstract: A dual-mode band-pass filter having a greatly reduced size and a high design flexibility, includes a frame-shaped electrode pattern disposed on one surface or inside a dielectric substrate. A pair of input-output circuits are coupled to the frame-shaped electrode pattern. The plane shape and the line-width of the frame-shaped electrode pattern are configured so that two generated resonance modes are coupled to each other.

Abstract: A dished head and a wall part are integrally formed in one body by spinning, using a flat aluminum based material, and then a corrosion-proof protective coating is formed on the whole surface by the Irridite process to complete the canister. The combination of appropriate material selection and production process saves the processing time (man-hour) needed for forming resonator canisters and its surface treatment, improves the thermal conductivity, and consequently decreases individual differences of the radio frequency loss in resonator canisters.

Abstract: A resonator includes a hollow dielectric element having a hole therein, a helical line unit including a plurality of helical lines formed in the hole, and a ground electrode formed on an outer surface of the dielectric element.

Abstract: A high-frequency dielectric ceramic member is composed of an oxide ceramic containing Mg, Ba, Re, Ti, and 0, wherein Re is at least one element selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Dy, and Er. The oxide ceramic is represented by the formula aMgO-bBaO-cRe2On-(100-a-b-c)TiO2, wherein n=3 when Re is La, Nd, Sm, Eu, Dy, or Er, n=11/3 when Re is Pr, and n=4 when Re is Ce, wherein a, b, and c, in mole percent, satisfy the relationships 10.0≦a≦62.0, 0<b≦14.0, and 0<c≦16.5. A dielectric resonator, a dielectric filter, a dielectric duplexer, and a communication device, each including the high-frequency dielectric ceramic member, are also disclosed.

Abstract: The present invention relates to a three-order filtering structure. Each resonator includes an inductive portion and a capacitive portion. The inductive portion of the second resonator is folded that the inductive portion of the first resonator is coupled to the inductive portion of the third resonator forming a trisection filtering structure. The cross-couple between resonator 1 and 3 adds additional finite transmission zero below the passband.

Abstract: A band-pass filter includes a metal film provided on a dielectric body. The shape and size of the metal film and the coupling points of input-output coupling circuits are selected such that first and second resonance modes are generated. The metal film has protruding portions or concavities provided thereon such that resonance electric field strength in the first or second resonance mode is controlled to couple the first and second resonance modes to each other.

Abstract: A dielectric resonator includes a high-frequency dielectric ceramic containing a first ceramic having an adhesive strength of 70 newtons or more per 2 millimeter square to metallic coatings and a second ceramic having an adhesive strength of less than 70 newtons per 2 millimeter square to metallic coatings. The dielectric ceramic has composition in which the condition 10≦{A/(A+B)}×100 <100 is satisfied, where A represents the volume of the first ceramic and B represents the volume of the second ceramic.

Abstract: A resonator for use in a radio frequency filter including a substantially planar resonant portion that is substantially elliptical in plan. The resonant portion is mounted on a dielectric substrate. The resonator is configured to operate in at least a mode in which resonance occurs with a radial current and with substantially no current along the edge of the resonant portion. A filter comprising a plurality of the resonators is also disclosed.

Abstract: A dielectric resonator includes a slot line constructed by providing a slot electrode having a spiral slot at either an external face of a dielectric layer or inside the dielectric layer and a shielding conductor provided at a predetermined distance from the slot electrode. The slot line is employed as a resonant line so as to provide a dielectric resonator, an inductor, a capacitor, a dielectric filter, an oscillator, and/or a communication device.

Abstract: A printed bandpass filter is mounted on a precision substrate to eliminate the need for post-fabrication tuning. The filter input is capacitively coupled to a series of quarter wavelength resonators and the filter output. The quarter wavelength resonators are printed as spirals to reduce filter size. The resonators define the bandpass characteristics of the filter. The filter also weakly couples the input signal to the filter output in a manner to cancel the signal image. Mechanical clips mitigate thermal stress on solder connections when the precision substrate mounted on a second printed circuit board.

Abstract: Low loss tuners including a conductive tuning element and an electrical insulator may be used in conjunction with superconducting or any other resonant elements that form couplerions of RF filters. The low loss tuners prevent currents induced on the conductive tuning element from shorting to ground and causing heating and Q degradation in the RF filter.

Abstract: A dielectric resonance element comprises a dielectric member integrally formed and composed of first and second plate portions which intersect each other such that respective center lines of the plate portions are coincident with each other. The first and second plate portions cause TE01&dgr; resonance modes to develop, in which the electric field vectors of the TE01&dgr; resonance modes are turned in the in-plane directions of the plate portions.

Abstract: A method of producing a band-pass filter includes selecting the shape of a metallic film and the connection points of input-output coupling circuits such that first and second resonance modes are generated in a metallic film provided on a dielectric substrate. At least a portion of the resonance current or the resonance electric field in at least one of the resonance modes is made discontinuous such that the first and second resonance modes are coupled.

Abstract: A resonator, a filter, and a duplexer are provided which are capable of very effectively suppressing the power loss caused by the edge effect, and which allow a great reduction in the overall size to be achieved. Also, a communication device including the above-mentioned filter or duplexer is provided. A ground electrode is formed over the bottom surface of a dielectric substrate, and a multiple spiral line pattern is formed on the top surface thereof. A radial line pattern is further formed on this surface with an insulation layer interposed therebetween. By thus disposing the radial pattern adjacently to the multiple spiral resonator constituted of the above-mentioned multiple spiral line, an electrostatic capacitance is added to the multiple spiral resonator. This reduces the occupation area of the resonator on the substrate, and improves the loss reduction effect.

Abstract: A stacked type dielectric resonator includes a plurality of stripline conductors disposed in a dielectric substrate composed of a plurality of stacked dielectric layers. Ground electrode portions are continuously formed on portions of the dielectric substrate. Via holes are provided to electrically connect the respective stripline conductors to portions of the round electrode disposed on an upper or lower surface, and another portion of the ground electrode is connected to at least one side surface.

Abstract: A dual mode band-pass filter includes a dielectric body having first and second main surfaces, a metal film partially disposed on the first main surface of the dielectric body or at a predetermined level in the dielectric body, the metal film having any one of an opening, a protrusion, and a cut-out arranged to combine two resonant modes, at least one ground electrode disposed on the second main surface or in the interior of the dielectric body so as to be opposed to the metal film with a portion of the dielectric body being disposed therebetween, and a pair of input-output coupling circuits that are coupled with different portions of the metal film. The dielectric body includes a dielectric ceramic containing a ceramic and a glass as main constituents, capable of being fired simultaneously with Cu, Ag, or Au, and having a Q value of more than approximately 300 at about 10 GHz.

Abstract: A band pass distributed element filter having real and imaginary transmission zeros by sequentially connecting half wavelength microstrip resonators and adding a cross coupling circuit has been difficult to implement as a planar circuit on the same plane, since the cross coupling circuit crosses one of the resonators. The distributed element filter is constructed by sequentially connecting n half wavelength microstrip resonators (n is an even number equal to or more than 4) each formed from a straight or hairpin microstrip line, wherein the number of straight microstrip lines and the number of hairpin microstrip lines are both odd, and wherein quarter wavelength straight microstrip lines for external circuit connection are coupled to the first and n th resonators, respectively, and a cross coupling circuit is connected to the microstrip lines of these resonators or to the ends coupled to the microstrip lines.

Abstract: A dual mode band pass filter is constructed to be very compact and such that the coupling strength and bandwidth can be easily and widely adjusted while maintaining sufficient freedom of design. A metal film for forming a resonator is arranged on a first main surface of a dielectric body or at a certain height in the dielectric body. At least one ground electrode is arranged such that the ground electrode is opposed to the metal film via the dielectric body. The metal film is connected to input/output coupling circuits. In the region where the metal film is opposed to the ground electrode, two portions are partially provided. Each of these two portions has a relative permittivity that is different from the relative permittivity of the remaining portion, in order to couple two resonance modes.

Abstract: A method of producing a band-pass filter includes selecting the shape of a metallic film and the connection points of input-output coupling circuits such that first and second resonance modes are generated in a metallic film provided on a dielectric substrate. At least a portion of the resonance current or the resonance electric field in at least one of the resonance modes is made discontinuous such that the first and second resonance modes are coupled.

Abstract: A dielectric resonator includes a slot line constructed by providing a slot electrode having a spiral slot at either an external face of a dielectric layer or inside the dielectric layer and a shielding conductor provided at a predetermined distance from the slot electrode. The slot line is employed as a resonant line so as to provide a dielectric resonator, an inductor, a capacitor, a dielectric filter, an oscillator, and/or a communication device.

Abstract: A high frequency ceramic compact includes Al, Ti and Mn as metallic elements and contains substantially no Al2TiO5 phase as determined by X-ray diffraction analysis and is obtained by firing at about 1310° C. or lower. A preferred high frequency ceramic compact is represented by the following formula and has a Q-value at 10 GHz of 10,000 or more: (100−x−y)AlO3/2−xTiO2−yMnO, wherein x and y are % by mole and x and y satisfy the following conditions: 3.0≦x≦9.0; and 0.1≦y≦1.0. These high frequency ceramic compacts have a relative dielectric constant of 20 or less, a Q-value at 10 GHz of 10,000 or more, and can optionally control the temperature coefficient of resonant frequency around 0 ppm/° C.

Abstract: A dual-mode band-pass filter having a greatly reduced size and a high design flexibility, includes a frame-shaped electrode pattern disposed on one surface or inside a dielectric substrate. A pair of input-output circuits are coupled to the frame-shaped electrode pattern. The plane shape and the line-width of the frame-shaped electrode pattern are configured so that two generated resonance modes are coupled to each other.

Abstract: A HE0&ggr;&dgr; mode dielectric resonator (12) includes a cylindrical dielectric disk (32) having top and bottom ends (20, 22) spaced apart by a closed curve wall (24). The dielectric disk (32) has a 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) is formed at the closed curved wall (24) but not the top and bottom ends (20, 22). The hole (36) has a preferred diameter less than 0.2 times the diameter of the disk. A tuning plug (30) is formed from a material having a dielectric constant less than 0.5 times the dielectric constant of the dielectric disk (32) and an unloaded quality factor greater than 2.0 times the unloaded quality factor of the dielectric disk (32). The tuning plug is inserted to a desired depth within the hole (36) of the dielectric disk (32).

Abstract: A resonator includes a hollow dielectric element having a hole therein, a helical line unit including a plurality of helical lines formed in the hole, and a ground electrode formed on an outer surface of the dielectric element.

Abstract: A stacked dielectric filter includes two sets of resonators arranged in a dielectric substrate constructed by laminating a plurality of dielectric layers, in which each of the resonators includes at least two resonance electrodes superimposed in a stacking direction. One of the resonance electrodes of the two resonance electrodes for constructing each of the resonators is formed to have a wide width as compared with the other resonance electrode. Accordingly, even when stacking deviations occur in the plurality of resonance electrodes during the production process, it is possible to decrease the variation of characteristics. Thus, it is possible to maximally exhibit the effect (high Q value, small size, and high performance) to be obtained by constructing the resonator by superimposing the plurality of resonance electrodes in the stacking direction.

Abstract: Electrodes having slot patterns, electrodes having strip patterns, or dielectric strips, for example, form transmission lines and resonator patterns on the upper faces of dielectric substrates or conductive substrates, for example. Resonators formed by the resonator patterns are arranged at the ends of the transmission lines at the end portions of the substrates. A pair of the resonators are electromagnetically coupled to each other, whereby the corresponding transmission lines are also connected to each other.

Abstract: A method and system for designing a radio frequency (RF) coil assembly is disclosed herein. The designing scheme or tool includes determining a self inductance by solving analytically or numerically two-dimensional boundary value problems s. The scheme further includes determining at least one mutual inductance by solving analytically or numerically the two-dimensional boundary value problems. The ratio of the mutual inductance and the self inductance represents a magnetic coefficient of coupling of the RF coil assembly.

Abstract: A high-frequency circuit device solves problems caused by a spurious mode reflection generated at a part where propagation of a spurious mode wave is prevented, with the result that propagation of the spurious mode wave such as a parallel plate mode wave is blocked. In the arrangement of the high-frequency circuit device, a leakage spurious mode wave radiates from a transmission line including at least two parallel planar conductors, and the leakage spurious mode wave is reflected by a spurious-mode reflection circuit disposed parallel to the transmission line. The distance between the transmission line and the spurious-mode reflection circuit is equivalent to the length in which a wave reflected by the spurious-mode reflection circuit is cancelled by the transmission line.

Abstract: A resonator including a lower substrate having a groove, a dielectric filling the groove, a material film formed on the inner wall of the groove, the material film for preventing the permittivity from suddenly changing between the lower substrate and the dielectric, an upper substrate that is combined with the lower substrate to form a cavity, a conductive thin film formed on the lower surface of the upper substrate to face the dielectric and having a slot in contact with the material film and exposing the dielectric, and a strip line for a wave-guide that is formed on the upper part of the upper substrate and is connected to the conductive thin film. According to the resonator, the size of a cavity corresponding to a given resonance frequency can be reduced by filling a cavity with a dielectric (or magnetic material).

Abstract: A resonator includes a hollow dielectric element having a hole therein, a helical line unit including a plurality of helical lines formed in the hole, and a ground electrode formed on an outer surface of the dielectric element.

Abstract: A method of tuning a microwave or RF circuit is given which comprises the steps of taking a microwave or RF circuit (20) located in a casing (57), said casing comprising a housing portion (32) and a window portion (50), said window portion (50) being substantially conducting at microwave/RF frequencies, and comprising at least one area that is substantially transparent at optical frequencies and, directing a laser beam (66) onto said microwave or RF circuit through said window portion (50) so as to alter the material properties of selected areas of said microwave or RF circuit (20). This permits microwave and RF circuits, including microwave filters, to be tuned without the need for tuning screws.

Abstract: A resonator including a lower substrate having a groove, a dielectric filling the groove, a material film formed on the inner wall of the groove, the material film for preventing the permittivity from suddenly changing between the lower substrate and the dielectric, an upper substrate that is combined with the lower substrate to form a cavity, a conductive thin film formed on the lower surface of the upper substrate to face the dielectric and having a slot in contact with the material film and exposing the dielectric, and a strip line for a wave-guide that is formed on the upper part of the upper substrate and is connected to the conductive thin film. According to the resonator, the size of a cavity corresponding to a given resonance frequency can be reduced by filling a cavity with a dielectric (or magnetic material).

Abstract: A dielectric laminated device, has a layered product including a plurality of dielectric layers; and a plurality of strip line conductors arranged in the interior of the layered product, wherein the thickness of at least part of the side part of at least one strip line conductor among the plurality of strip line conductors is thicker than that of the central part.