Abstract: A production method for a band-pass micro-strip filter which need not conduct an adjusting process on the central frequency in a pass band based on the frequency characteristics of a filter that have been previously measured and inspected after the filter is produced. The production method for a micro-strip filter includes the step of adjusting, in the production process, a resonator length according to the thickness and capacitance of a substrate that have been measured in advance.

Abstract: A continuously variable waveguide filter (100). The variable waveguide filter can include at least one waveguide filter cavity (154, 156, 158) and a fluid dielectric (108) having a permittivity and a permeability at least partially disposed within the waveguide filter cavity (154, 156, 158). At least one composition processor (101) is included and adapted for dynamically changing a composition of the fluid dielectric (108) to vary at least one electrical characteristic. A controller (136) is provided for controlling the composition processor (101) in response to a waveguide filter control signal (137).

Abstract: A BPF 20, which is a filter circuit, is formed by arranging a plurality of wiring patterns 21a, 21b and 22a to 22c on a substrate 10. Also, a freely movable impedance control rod 26 is formed so as to interfere with characteristics of the wiring patterns 21a, 21b and 22a to 22c of the BPF 20 without touching them. Interfering with the characteristics means cutting the passage of the frequency at the BPF 20, so that switching depends on whether the frequency is passed or cut.

Abstract: The present invention provides a small, thin filter circuit showing a desired filter characteristic which is highly accurate, and producible with a high efficiency. The filter circuit includes a pair of dielectric insulating layers 2 and 3, upper and lower, each having a ground pattern 11 (16) formed on the main side thereof, and an inner wiring layer 4 formed between the dielectric insulating layers 2 and 3 and having capacitively coupled resonator conductive patterns 6 and 7 each connected at one end thereof to the ground patterns 11 and 16 via inter-layer connecting vias 12 and open-circuited at the other end.

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 high-frequency device comprises a dielectric substrate, a filter element which has a plurality of resonating elements made of a first superconductor film on the dielectric substrate, a dielectric plate which faces the dielectric substrate substantially in parallel with the substrate and covers the plurality of resonating elements, and a spacing adjusting member configured to control the spacing between the dielectric plate and the dielectric substrate. The high-frequency device enables the pass-band frequency of the filter to be adjusted with high accuracy without variations in the skirt characteristic or ripple characteristic.

Abstract: This invention provides tunable devices incorporating the dielectric CaCu3Ti4O12. CaCu3Ti4O12 is especially useful in tunable devices such as phase shifters, matching networks, oscillators, filters, resonators, and antennas comprising interdigital and trilayer capacitors, coplanar waveguides and microstrips.

Abstract: An artificial electro-ferromagnetic meta-material demonstrates the design of tunable band-gap and tunable bi-anisotropic materials. The medium is obtained using a composite mixture of dielectric, ferro-electric, and metallic materials arranged in a periodic fashion. By changing the intensity of an applied DC field the permeability of the artificial electro-ferromagnetic can be properly varied over a particular range of frequency. The structure shows excellent Electromagnetic Band-Gap (EBG) behavior with a band-gap frequency that can be tuned by changing the applied DC field intensity. The building block of the electro-ferromagnetic material is composed of miniaturized high Q resonant circuits embedded in a low-loss dielectric background. The resonant circuits are constructed from metallic loops terminated with a printed capacitor loaded with a ferro-electric material. Modifying the topology of the embedded-circuit, a bi-anisotropic material (tunable) is examined.

Abstract: A device responsive to an electromagnetic signal includes a conductor for conducting the electromagnetic signal, a magnetic structure disposed proximate the conductor to enable gyromagnetic interaction between the electromagnetic signal and the magnetic structure and a transducer disposed on the magnetic structure for controlling a domain pattern in the magnetic structure.

Abstract: A ferro-electric filter and method of tuning same. The filter includes a switch for switching between quarter wave resonator and half wave resonator modes. The filter also includes a ferro-electric component for tuning the resonant frequency. The method includes applying a switching control signal to the switch for switching between resonant frequencies and applying a tuning control signal for tuning the resonant frequency.

Abstract: A novel transceiver is provided which allow for either a transmitter or receiver to be dynamically switched between two different frequency bands by use of a novel switchable lowpass filter.

Abstract: The present invention quantifies and reduces losses in tunable bandpass filters having ferro-electric capacitors. Given a required insertion loss and the quality factor of a resonator, the geometric losses resulting from a particular topology for the ferro-electric capacitor and the metal losses are accounted for to quantify the allowable ferro-electric losses.

Abstract: An interconnect module and a method of manufacturing the same is described comprising: a substrate, an interconnect section formed on the substrate, and a variable passive device section formed on the substrate located laterally adjacent to the interconnect section. The interconnect section has at least two metal interconnect layers separated by a dielectric layer and the variable passive device has at least one moveable element. The moveable element is formed from a metal layer which is formed from the same material and at the same time as one of the two interconnect layers. The moveable element is formed on the dielectric layer and is released by local removal of the dielectric layer. Additional interconnect layers and intermediate dielectric layers may be added.

Abstract: A circuit is provided wherein the electronic properties of the circuit are varied by a magnetic actuator. The circuit includes a fixed substrate and a movable substrate. The magnetic actuator comprises a magnetic driver on an upper surface of the fixed substrate that is substantially overlapped by an HTS reaction plate on the lower surface of the fixed substrate. A tuning current applied through a continuous strip of HTS material in the magnetic driver induces a repulsive magnetic force causing the movable substrate to move with respect to the fixed substrate.

Abstract: A variable RF filter (102) which includes one or more filter elements (104,106). The filter elements (104,106) can be formed from a structure selected from the group consisting of stripline, microstrip, and buried microstrip. A fluid dielectric (108) and a fluid control system (150) for selectively moving the fluid dielectric from a first position to a second position are provided. In the first position, the fluid dielectric (108) is electrically and magnetically coupled to the filter elements (104,106) to produce a first filter response. In the second position, the fluid dielectric (108) is electrically and magnetically decoupled from the filter elements (104,106) to produce a second filter response distinct from the first filter response. The first position can be defined by a bounded region located adjacent to the filter elements (104,106) and the second position is defined by a fluid storage reservoir (170).

Abstract: A voltage-controlled tunable comb-ring type filter which includes a plurality of resonators and wherein the plurality of resonators include a first of at least two combline type resonators, a first of at least one ring type resonator coupled to the first of at least two combline type resonator, a second of the at least two combline type resonator coupled to the first of at least one ring type resonator and cross coupled to the first of at least two combline type resonators, and at least one of the plurality of resonators includes at least one variable capacitor. An input transmission line is connected with at least one of the plurality of resonators and an output transmission line is connected with at least one of the resonators.

Abstract: Thin type TEM dual-mode rectangular-planar dielectric waveguide bandpass filter is disclosed. The bandpass filter disclosed in the specification is constituted of a dielectric block 11 having a top surface, a bottom surface and first to fourth side surfaces, a metal plate 12 to be in a floating state substantially entirely formed on the top surface of the dielectric block 11, a metal plate 13 to be grounded formed on the bottom surface of the dielectric block 11, and exciting electrodes 14 and 15 formed on the bottom surface of the dielectric block 11. The metal plate 13 has a removed portion 16 exposing a part of the bottom surface of the dielectric block 11. The removed portion 16 destroys the symmetry of the resonator structure of each mode so that a coupling between the dual-mode is provided. According to this structure, because the exciting electrodes 14 and 15 are formed on the bottom surface of the dielectric block 11, thickness of the dielectric block 11 can be easily reduced.

Abstract: A method for easily adjusting the frequency of an attenuation pole in a dual-mode band pass filter which is very compact and greatly increases coupling strength while maintaining a great deal of freedom of design. The dual-mode band pass filter includes a metal film partially disposed on a main surface of a dielectric substrate or disposed inside of the dielectric resonator so as to define a resonator. An opening is formed in the metal film to couple two resonance modes. Input/output coupling circuits are coupled to the metal film. At least one of coupling portions of the input/output coupling circuits or input/output portions thereof are moved in a direction along a perimeter of the metal film.

Abstract: A high-frequency filter for use in a superhigh frequency band such as of microwaves and millimeter waves has a substrate, a metal conductor disposed on a first main surface of the substrate, a resonator comprising a transmission line of a coplanar structure which is made of the metal conductor, and input and output lines disposed on a second main surface of the substrate transversely across the resonator and electromagnetically coupled to the resonator. The resonator may be a coplanar line resonator (coplanar waveguide resonator) or a slot line resonator. The high-frequency filter has a steep attenuating gradient in filter characteristics. The high-frequency filter may be combined with variable-reactance devices such as variable-capacitance diodes for electronically controlling the filter characteristics.

Abstract: This invention provides a notch filter including a main transmission line, a coupling mechanism, and at least one electrically tunable resonator coupled to the transmission line through the coupling mechanism. A tunable dielectric varactor or a microelectromechanical variable capacitor is provided in each of the resonators. Wireless telephone handsets that include the filter are also included.

Abstract: A voltage-controlled tunable multilayer filter which comprises a first resonator on a first layer of dielectric material or low-temperature-co fired-ceramic; a second resonator coupled to said first resonator on a second layer of dielectric material or low-temperature-co fired-ceramic; a third resonator located on a third layer of dielectric material or low-temperature-co fired-ceramic coupled to said second resonator and cross coupled to said first resonator; an input transmission line connected to said first resonator; an output transmission line connected with said third resonator; and a variable capacitor in at least one of said resonators.

Abstract: A method for the design of tunable filters is disclosed. MEMS switches are used to alter the resonant frequency of one or more resonators. By tuning the resonant frequency of the resonators, the filter's characteristics also are tuned. Furthermore, MEMS switches are used to alter the input coupling, including direct input coupling and capacitive input coupling. Direct input coupling is altered by using the MEMS switches to select different input connection points. Capacitive input coupling is altered by using MEMS switches to add additional input capacitance to an input coupling capacitor.

Abstract: A high-frequency device comprises a dielectric substrate, a filter element which has a plurality of resonating elements made of a first superconductor film on the dielectric substrate, a dielectric plate which faces the dielectric substrate substantially in parallel with the substrate and covers the plurality of resonating elements, and a spacing adjusting member configured to control the spacing between the dielectric plate and the dielectric substrate. The high-frequency device enables the pass-band frequency of the filter to be adjusted with high accuracy without variations in the skirt characteristic or ripple characteristic.

Abstract: A tunable ferroelectric component and a narrowband resonant circuit for measuring the loss of the ferroelectric component. The ferroelectric component may be a capacitor integrated in the resonant circuit. The testing method eliminates other sources of loss to isolate the loss due to the ferroelectric material and to demonstrate that this loss is low.

Abstract: A high frequency filter design for the GHz frequency range is provided. The high frequency filter comprises at least a microstrip design that incorporates both transverse and lateral couplings between the filters resonators. The high frequency filter further incorporates an opened or fully enclosed enclosure over the strip line or microstrip circuitry and may be manufactured on a relatively thick dielectric substrate having a thickness that is greater than about a twentieth of the filter's band-pass wavelength in the dielectric substrate. The high frequency filter design provides a small, easily reproducible filter design better than prior art microstrip filters.

Abstract: A radio-filter of combline structure with a capacitor compensation circuit, having a transmission line filter with at least one pair of transmission lines arranged between input and output terminals for filtering the input signals through the input terminal to select signals of a given frequency band delivered to the output terminal, each of the transmission lines having a via-hole at each of its ends, a capacitor compensator of lumped element connected through one of the via-holes to one of the transmission lines for providing capacitance between the transmission line and ground, and a ground layer connected to the other via-hole not connected with the transmission line to ground the transmission line.

Abstract: A high-frequency filter device includes at least one filter to be connected to a high-frequency stage of a wireless apparatus. The filter includes a voltage-controlled variable frequency resonance element which is made of a resonance element and a voltage-controlled variable impedance element electrically connected to the resonance element. The high-frequency filter device includes a control section for controlling a voltage applied to the variable impedance element, and a signal monitoring section for outputting a control signal, with which the voltage is controlled, to the control section based on frequency data as to an oscillating frequency of a local oscillator of the wireless apparatus. The signal monitoring section controls a band frequency of the at least one filter based on the frequency data in such a manner that the band frequency is adaptively changed.

Abstract: The present invention tunes a coupled resonator filter to a given tuning specification using a reference filter that was previously tuned to the specification. A method of tuning a subject filter comprises determining a frequency change for each resonator of the subject filter and applying each determined change to the respective resonator, such that the subject filter is tuned to the specification. The frequency changes are determined from frequency-pushing interactions between combinations of resonators in either the reference or subject filter. A system for tuning the subject filter comprises a measurement system, a tuning program stored in a system memory, and a controller that controls the measurement system and executes the tuning program. The tuning program comprises instructions that preferably implement the tuning method. A tuned coupled resonator filter comprises a plurality of resonators that are adjusted in accordance with the method or using the tuning system.

Abstract: By using ICs with combined inputs for the VHF-high bandpass circuit and the UHF bandpass circuit, undesirable resonances occur which are caused by one of the tuned circuits. The problem is solved by providing a switching means for decoupling the UHF bandpass circuit from the combined inputs when a VHF-high band signal is received by the VHF-high bandpass circuit. The switching means comprises a switch coupled between the UHF bandpass circuit and the common inputs.

Abstract: A ferro-electric filter and method of tuning same. The filter includes a switch for switching between quarter wave resonator and half wave resonator modes. The filter also includes a ferro-electric component for tuning the resonant frequency. The method includes applying a switching control signal to the switch for switching between resonant frequencies and applying a tuning control signal for tuning the resonant frequency.

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: An electronic filter includes a first microstrip line hairpin resonator including first and second arms, a first varactor connected between a first end of the first arm and a first end of the second arm of the first microstrip line hairpin resonator, a first capacitor connected between a second end of the first arm and a second end of the second arm of the first microstrip line hairpin resonator, the first and second arms being coupled to provide a first transmission zero, an input coupled to the first microstrip line hairpin resonator, a second microstrip line hairpin resonator including third and fourth arms, a second varactor connected between a first end of the third arm and a first end of the fourth arm of the second microstrip line hairpin resonator, a second capacitor connected between a second end of the third arm and a second end of the fourth arm of the second microstrip line hairpin resonator, the third and fourth arms being coupled to provide a second transmission zero, and an output coupled to th

Abstract: A method for the design of tunable filters is disclosed. MEMS switches are used to alter the resonant frequency of one or more resonators. By tuning the resonant frequency of the resonators, the filter's characteristics also are tuned. Furthermore, MEMS switches are used to alter the input coupling, including direct input coupling and capacitive input coupling. Direct input coupling is altered by using the MEMS switches to select different input connection points. Capacitive input coupling is altered by using MEMS switches to add additional input capacitance to an input coupling capacitor.

Abstract: The present invention quantifies and reduces losses in tunable bandpass filters having ferro-electric capacitors. Given a required insertion loss and the quality factor of a resonator, the geometric losses resulting from a particular topology for the ferro-electric capacitor and the metal losses are accounted for to quantify the allowable ferro-electric losses.

Abstract: A radio frequency electronic filter includes an input, an output, and first and second resonators coupled to the input and the output, with the first resonator including a first voltage tunable dielectric varactor and the second resonator including a second voltage tunable dielectric varactor. The resonators can include a lumped element resonator, a ceramic resonator, or a microstrip resonator. Additional voltage tunable dielectric varactors can be connected between the input and the first resonator and between the second resonator and the output. Voltage tunable dielectric varactors can also be connected between the first and second resonators.

Abstract: A duplexer is provided that includes a first tunable bandpass filter, a second tunable bandpass filter and means for coupling the first bandpass filter and the second bandpass filter to an antenna. The duplexer is operated by tuning the first tunable bandpass filter to provide a passband corresponding to an assigned transmit frequency, and tuning the second tunable bandpass filter to provide a passband offset from an assigned receive frequency, when the duplexer is operated in a transmit mode. When the duplexer is operated in a receive mode, the first tunable bandpass filter is tuned to provide a passband offset from an assigned transmit frequency and the second tunable bandpass filter is tuned to provide a passband corresponding to the assigned receive frequency.

Abstract: A voltage-controlled tunable filter includes at least two cavity resonators electrically coupled to each other. A voltage tunable dielectric capacitor is positioned within each of the resonators. Connections are provided for applying a control voltage to the voltage tunable dielectric capacitors. An input is coupled to the one of the resonators, and an output is coupled to the other resonator.

Abstract: Resonator electrodes are provided on the upper face of a dielectric substrate. The ratios (W1/L1) and (W3/L3) of the electrode widths W1 and W3 to the electrode lengths L1 and L3 of the resonator electrodes of the first and last stages are set at substantially 1.05<W/L<1.95. Lead-out electrodes are connected to the resonator electrodes of the first and last stages on the opposite sides of the center axis which is a straight-line axis passing through the center positions of the resonator electrodes of the first and last stages. Thereby, an attenuation pole is generated on the lower band side of the pass-band.

Abstract: A high-frequency filter device includes at least one filter to be connected to a high-frequency stage of a wireless apparatus. The filter includes a voltage-controlled variable frequency resonance element which is made of a resonance element and a voltage-controlled variable impedance element electrically connected to the resonance element. The high-frequency filter device includes a control section for controlling a voltage applied to the variable impedance element, and a signal monitoring section for outputting a control signal, with which the voltage is controlled, to the control section based on frequency data as to an oscillating frequency of a local oscillator of the wireless apparatus. The signal monitoring section controls a band frequency of the at least one filter based on the frequency data in such a manner that the band frequency is adaptively changed.

Abstract: A series of switchable and tunable filters is provided. The filters are manufactured using coplanar waveguide fabrication techniques and micro-electro-mechanical (MEM) system switches. By making a MEM switch conductive to connect two portions of a filter element, a filter inductor is implemented. By making the MEM switch non-conductive, a filter capacitor is implemented. This results in smaller filters that can be either switched between a band pass filter and a low pass filter or switched between operating ranges.

Abstract: A notch filter made up from laminated dielectric, which attenuates a specific frequency of a signal to be transmitted, comprises two terminals for input or output a signal to be transmitted, a line connected between those terminals, two resonators each having one end connected to ground and an other end, two first coupling capacitors, and a second coupling capacitor. Each end of the line is connected to the other end of the resonator through the first capacitor. The second capacitor couples said two resonators each other.

Abstract: A method is disclosed which allows the electrical characteristics of a microstrip line filter or the like to be reliably measured using a two-dimensional measuring jig, even if components thereof to be measured are small in size and are not discrete components. A first ground electrode is formed substantially over the entire bottom surface of a dielectric substrate, and resonator electrodes are disposed on the top surface of the dielectric substrate. Input/output electrodes are each connected to a first-stage resonator electrode and a last-stage resonator electrode. Second ground electrodes conductively connected to the first ground electrode are disposed beside each of the input/output electrodes. By this structure, each of the input/output portions is provided with a grounded coplanar guide configuration.

Abstract: An electronic filter includes a substrate, a ground conductor, a plurality of linear microstrips positioned on a the substrate with each having a first end connected to the ground conductor. A capacitor is connected between a second end of the each of the linear microstrips and the ground conductor. A U-shaped microstrip is positioned adjacent the linear microstrips, with the U-shaped microstrip including first and second extensions positioned parallel to the linear microstrips. Additional capacitors are connected between a first end of the first extension of the U-shaped microstrip and the ground conductor, and between a first end of the second extension of the U-shaped microstrip and the ground conductor. Additional U-shaped microstrips can be included. An input can coupled to one of the linear microstrips or to one of the extensions of the U-shaped microstrips. An output can be coupled to another one of the linear microstrips or to another extension of one of the U-shaped microstrips.

Abstract: Electronic filters include an input, an output and a plurality of resonators series coupled between the input and the output. Each of the resonators is coupled to a tunable capacitance. In addition, a coupling means is provided between non-adjacent ones of the resonators. The resonators can include microstrip resonators, stripline resonators, resonant cavities, or other types of resonators. The tunable capacitance can be provided by tunable dielectric varactors or microelectromechanical variable capacitors. Another tunable capacitor can be included in the coupling means to provide a tunable notch response.

Abstract: A high-frequency filter device includes at least one filter to be connected to a high-frequency stage of a wireless apparatus. The filter includes a voltage-controlled variable frequency resonance element which is made of a resonance element and a voltage-controlled variable impedance element electrically connected to the resonance element. The high-frequency filter device includes a control section for controlling a voltage applied to the variable impedance element, and a signal monitoring section for outputting a control signal, with which the voltage is controlled, to the control section based on frequency data as to an oscillating frequency of a local oscillator of the wireless apparatus. The signal monitoring section controls a band frequency of the at least one filter based on the frequency data in such a manner that the band frequency is adaptively changed.

Abstract: A strip line directional coupler includes a controlled amount of potting compound applied to establish a desired coupling factor between at least two cooperating strip lines. In one embodiment the strip line directional coupler is positioned in a housing that is filled with the potting compound until the desired coupling factor is established. A network analyzer monitors the coupling factor as the potting compound is added. Once the desired coupling factor is established, the flow of potting compound into the housing is automatically terminated.

Abstract: A patch filter element has an electrically-insulating substrate with an electrically conductive region on a first surface of said substrate, and a slot such as a crossed slot dividing the conductive region into a plurality of triangular sections. A mode coupling device, such as a cutout corner of a triangular section, induces orthogonal modes of vibration of an electromagnetic field about the plurality of sections. The ferroelectric oxide is disposed in the slot for adjusting a dielectric constant of the oxide in accordance with a bias voltage applied across the slot between adjacent ones of the sections for turning the patch filter element. Metallic walls may be constructed along edges of the slot for increased capacitance.

Abstract: A micro-resonator ferrite microstrip coupling filter that has reduced susceptibility to variations in the manufacturing process, as well as from changes due to mechanical or environmental stress, and allows for an assembly process that can be easily automated. The filter comprises bottom and top substrates with conductive ground planes on one side of the substrates and microstrip conductors on the other side of the substrates, with the conductors of both substrates being orthogonal to each other. A circuit block is disposed between the bottom and top substrates such that the circuit block contacts the sides of the substrates containing microstrip conductors. Multiple YIG spheres are inserted into round orifices on the circuit block and positioned between the bottom and top substrates. A magnetic field is applied orthogonally to the conductors.

Abstract: A filter device includes a super-conducting type filters connected in series with each other and is accommodated in a vacuum chamber. Operating temperatures of the filters are controlled to different temperatures from the outside of the vacuum chamber independently of each other. Each filter varies its filtering characteristics, particularly its central frequency of pass-band, in correspondence with the operating temperature, while maintaining the same pass-band width. As the filters operated at the different operating temperatures provide different filtering characteristics, the combined or resulting filtering characteristics of the filtering device can be adjusted as desired even after the filtering device is installed at a mobile telecommunication base station.

Abstract: A tunable electrical filter constructed pursuant to the teachings of the present invention includes: (a) a plurality of resonator units coupled between an input locus and an output locus; and (b) a plurality of tunable dielectric varactor units; respective individual varactor units of the plurality of varactor units being coupled between respective pairs of the plurality of resonator units, coupled between the plurality of resonator units and the input locus, and coupled between the plurality of resonator units and the output locus.