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| Number | Title | Issue Date |
| 7889030 | Passive temperature compensation of silicon MEMS devices The invention relates to MEMS devices. In one embodiment, a micro-electromechanical system (MEMS) device comprises a resonator element comprising a semiconducting material, and at least one trench formed in the resonator element and filled with a material comprising... | 02/15/2011 |
| 7671708 | Mechanical temperature-compensating device for a phase-stable waveguide The present invention relates to a mechanical compensating device for a waveguide (1). More precisely, the present invention provides a technology for ensuring phase stability in a waveguide (1) subject to expansions and contractions owing to temperatu... | 03/02/2010 |
| 7439830 | Constant contact pressure PIM interface An interface that provides minimum changes in contact pressure over a thermal range is disclosed. The interface is a mated joint of given material, typically metallic, joined by a mechanical fastener or fasteners. The fastener(s) create contact pressure at the joint... | 10/21/2008 |
| 7427906 | Constant contact pressure PIM interface An interface that provides minimum changes in contact pressure over a thermal range is disclosed. The interface is a mated joint of given material, typically metallic, joined by a mechanical fastener or fasteners. The fastener(s) create contact pressure at the joint... | 09/23/2008 |
| 7375605 | Method and device for compensating the temperature of circular resonators A method and an arrangement for temperature compensation at circular resonators with dual mode utilization, which includes a material with a low coefficient of thermal expansion and for which the tensile or compressive forces are transferred to the resonator wall an... | 05/20/2008 |
| 7358835 | Constant contact pressure PIM interface An interface that provides minimum changes in contact pressure over a thermal range is disclosed. The interface is a mated joint of given material, typically metallic, joined by a mechanical fastener or fasteners. The fastener(s) create contact pressure at the joint... | 04/15/2008 |
| 7352263 | Method and mechanism for tuning dielectric resonator circuits The invention comprises a technique and associated mechanisms by which dielectric resonator circuits, such as filters, can be tuned in both frequency, bandwidth or both without the need for irises, tuning screws and/or tuning plates. In accordance with the invention... | 04/01/2008 |
| 7352264 | Electronically tunable dielectric resonator circuits In order to permit electronic tuning of the frequency of a circuit including dielectric resonators, such as a dielectric resonator filter, tuning plates are employed adjacent the individual dielectric resonators. The tuning plates comprises two separate conductive p... | 04/01/2008 |
| 7310031 | Dielectric resonators and circuits made therefrom A dielectric resonator having variable cross-section, preferably varying monotonically, and, most preferably, the resonator being in the shape of a truncated cone. Such shapes displace the H11 mode from the TE mode in the longitudinal direction of the con... | 12/18/2007 |
| 7295638 | Communication device A direct sequence spread spectrum (DSSS) receiver (100) consistent with certain embodiments has a frequency generator (112) that generates a local oscillator signal without use of a piezoelectric crystal. A frequency converter (108) receives the... | 11/13/2007 |
| 7253708 | Radio frequency cavity resonatory with heat transport apparatus An RF cavity resonator that includes: a resonator chamber for containing an RF field; an RF coupling element coupled to the resonator chamber for introducing the RF field into and extracting the RF field from the resonator chamber; a tuning assembly for causing the ... | 08/07/2007 |
| 7250833 | Method and apparatus for stabilizing the temperature of dielectric-based filters A dielectric-based filter includes a thermally insulated housing, at least one filter formed from a dielectric material disposed inside the insulated housing, and a temperature maintenance device having a heating component and a cooling component for maintaining the... | 07/31/2007 |
| 7248127 | Crystal oscillator A quartz crystal oscillator in which phase noise is reduced includes: a resonance circuit having a quartz crystal unit and a split capacitor connected to the crystal unit; a transistor for oscillation having its base connected to the node of the crystal unit and the... | 07/24/2007 |
| 7227434 | Tuning screw assembly The present invention relates to a tuning screw assembly comprising a sleeve (100) with internal threads for engaging a tuning screw (200) having external threads. The sleeve comprises a first threaded portion (32) which is axially displaced in ... | 06/05/2007 |
| 7224248 | Ceramic loaded temperature compensating tunable cavity filter A high Q RF cavity resonator loaded with a ceramic disc, the resonator comprising an inner conductive post having a length less than a quarter wavelength. The resonance frequency of the resonator is tunable by changing a distance between a) an outer plate and b) a c... | 05/29/2007 |
| 7193489 | Radio frequency cavity resonator with heat transport apparatus An RF cavity resonator (400) that includes: a resonator chamber (410) for containing an RF field; an RF coupling element (450, 452) coupled to the resonator chamber for introducing the RF field into and extracting the RF field from the resonator... | 03/20/2007 |
| 7183881 | Cross-coupled dielectric resonator circuit A cross-coupled dielectric resonator circuit. Resonator circuits in accordance with the invention may be used to build low-loss compact filters, oscillators, and other circuits, particularly microwave circuits. The resonators are arranged relatively to each other wi... | 02/27/2007 |
| 7164222 | Film bulk acoustic resonator (FBAR) with high thermal conductivity The specification discloses embodiments of an apparatus comprising a film bulk acoustic resonator (FBAR) filter comprising a piezoelectric membrane having a portion thereof sandwiched between a first electrode and a second electrode, the piezoelectric membrane being... | 01/16/2007 |
| 7117133 | Photonic band gap structure simulator A system and method for designing photonic band gap structures. The system and method provide a user with the capability to produce a model of a two-dimensional array of conductors corresponding to a unit cell. The model involves a linear equation. Boundary conditio... | 10/03/2006 |
| 7106152 | Dielectric resonator, dielectric filter, and method of supporting dielectric resonance element A dielectric resonator has a metallic casing having an opening, a metallic cover which covers the opening, and a dielectric resonance element having a pair of flat surfaces formed opposite from each other, one of the pair of flat surfaces being brought into contact ... | 09/12/2006 |
| 7088203 | Slotted dielectric resonators and circuits with slotted dielectric resonators In accordance with the principles of the present invention, a resonator puck is provided with one or more vertical and/or horizontal, radial slits that improve the quality factor, Q, of circuits constructed from the resonators. Preferably, the slits are very narrow ... | 08/08/2006 |
| 7078990 | RF cavity resonator with low passive inter-modulation tuning element A tunable RF cavity resonator having reduced generation of passive inter-modulation, the tunable RF cavity resonator including a cavity body, a fixed tuning post at a first end of the cavity body, a dielectric rod in the fixed tuning post interior space with a first... | 07/18/2006 |
| 7061345 | Filter circuit with series and parallel elements Filter circuitry is provided with a series element and a parallel element. The filter circuitry transmits signals that fall within a certain passband and attenuates signals that don't fall within the certain passband. The series element is comprised of a resonance e... | 06/13/2006 |
| 7043115 | Tunable optical filter A tunable filter having a resonator with a resonant frequency dependent upon a variable gap is provided. The variable gap may be controllably altered by use of an actuator. The resonator is a high Q resonator that may be formed by a ring resonator, microsphere, micr... | 05/09/2006 |
| 6967540 | Synthesizers incorporating parascan TM varactors A synthesizer incorporating voltage tunable capacitors, comprising at least one resonator coupled into a base circuit of a bipolar transistor, the at least one resonator including at least one voltage tunable capacitor; the bipolar transistor including a collector w... | 11/22/2005 |
| 6960969 | Resonant cavity device converting transverse dimensional variations induced by temperature variations into longitudinal dimensional variations A resonant cavity device comprises a waveguide body having a lateral wall extending in a longitudinal direction, having a first coefficient of thermal expansion, and delimiting a resonant cavity in conjunction with opposite first and second end walls. The first end ... | 11/01/2005 |
| 6933811 | Resonator and high-frequency filter The resonator of the present invention includes a cylindrical dielectric and a conductor film covering the surface of the dielectric in close contact therewith. The conductor film is constructed of a cylindrical portion and two flat portions, and is formed by subjec... | 08/23/2005 |
| 6897746 | Phase stable waveguide assembly A waveguide assembly for operation over a range of temperatures includes a waveguide body and a plurality of restraining strips coupled to the waveguide body. The waveguide body includes a pre-curved narrow sidewall of material having a first coefficient of thermal ... | 05/24/2005 |
| 6882252 | Multi-layer microwave resonator A multi-layer microwave resonator (10) comprises a cavity (12) having an inner surface formed from an electrically conductive material. Pieces (16a-16e) of dielectric materials stacked on top of each other form a conriguous ... | 04/19/2005 |
| 6801107 | Vacuum electron device with a photonic bandgap structure and method of use thereof A vacuum electron device with a photonic bandgap structure that provides the ability to tune the behavior of the device to a particular mode of a plurality of modes of propagation. The photonic bandgap structure comprises a plurality of members, at least one of whic... | 10/05/2004 |
| 6742240 | Method for attaching resonator part A method for attaching an additional object to a resonator body. The method includes the steps of (1) placing the additional object in a recess of a pushing part of an extrusion machine; (2) pressing the pushing part against a bloom of a resonator body; and (3) pull... | 06/01/2004 |
| 6734766 | Microwave filter having a temperature compensating element A microwave filter having a temperature compensating element includes a housing wall structure, a filter lid, a resonator rod, a tuning screw and the temperature compensating element. The housing wall structure defines a cavity. The filter lid closes the cavity. The... | 05/11/2004 |
| 6727787 | Method and device for achieving a high-Q microwave resonant cavity A device for manipulating microwave radiation includes a substrate that defines the shape of a surface for reflecting microwave radiation. The device also includes a metal fitting. The fitting conforms to the defined shape, and provides the surface that reflects mic... | 04/27/2004 |
| 6603374 | Waveguide resonator device and filter structure provided therewith For fixing a dielectric insert in a waveguide, clamping bodies are provided which contact the dielectric insert on its outer periphery only tangentially. The dielectric insert is fixed in a wave propagation direction by a supporting element. In a further ... | 08/05/2003 |
| 6600393 | Temperature-compensated rod resonator A temperature-compensated rod resonator, comprising a housing (10) having electrically conducting walls, including at least one electrically conductive resonator rod (14) extending from a bottom wall (11) towards a top wall (13), a temperature-compensatin... | 07/29/2003 |
| 6580933 | Frequency stable resonator with temperature compensating layers A resonator for rf frequencies, especially microwave, in telecommunications systems, with an extremely stable resonant frequency over a desired operating temperature range, of predetermined width (Y) and thickness (X) and having a predetermined length (Z)... | 06/17/2003 |
| 6535087 | Microwave resonator having an external temperature compensator An externally temperature-compensated microwave resonator comprises a microwave resonator and an external temperature compensator. The microwave resonator is a multi-cavity waveguide. The cavities are configured side-by-side and coupled through irises. Th... | 03/18/2003 |
| 6529104 | Temperature compensated high power bandpass filter A bandpass filter makes use of at least one waveguide cavity that is thermally compensated to minimize drift of a resonant frequency of the cavity with thermal expansion of cavity components. The compensation relies on deformation of the shape of at least... | 03/04/2003 |
| 6529094 | Dielectric resonance device, dielectric filter, composite dielectric filter device, dielectric duplexer, and communication apparatus A dielectric resonance device includes a cavity body, a support base disposed inside the cavity body, and a dielectric core supported by the support base. A stepped portion is provided inside the cavity body such that a gap between the outer circumferenti... | 03/04/2003 |
| 6518858 | Resonator, filter, duplexer, and communication apparatus A resonator includes a conductive casing provided with a threaded screw hole, a screw at least partially inserted into the casing, and a fixing member fixing the screw and having a threaded screw hole. In the resonator, the linear expansivity of the casin... | 02/11/2003 |
