76 results about "Ceramic resonator" patented technology

Systems, methods and apparatus are provided for conducting local wireless audio signal transmissions from a local audio signal source to a person within a local signal transmission area. In certain embodiments, the transmissions are conducted over the 900 MHz local transmission band to a portable receiver unit supported on the headband of a stereo headphone unit. The receiver unit serves to down convert the 900 MHz signal to a local frequency band which is received by an FM receiver of the receiver unit which serves to reproduce the audio signals therefrom which are, in turn, converted to acoustic signals by electroacoustic transducers of the headphone. A transmitter unit includes a ceramic resonator stabilized FM transmitter, as well a filter for suppressing high frequency noise in an audio modulation signal, a stereo audio multiplexing unit utilizing a 3fH subcarrier and an overmodulation detection unit. In certain embodiments, the receiver unit is powered by a rechargeable battery which is recharged from the transmitter unit.

Telephone line service type identification is provided to a telephone technician in the field by the placement of one or more tuned circuit(s) across the telephone line. In one embodiment, an inexpensive tuned circuit such as a ceramic resonator forms a telecom service resonator ID device which is placed across a telephone line, either at the central office or at the customer premises. Injection of a test current at a predetermined frequency, and a suitable amplitude of the same indicates to the technician aspects of telecom service to that particular telephone line (e.g., the existence of POTS, ISDN, and / or xDSL) and or use of the telephone line by a home network such as HPNA. In another embodiment, a telecom service transponder ID device is formed to provide line service identification to an interrogating line technician. The telecom service transponder ID device is activated when the test signal including an appropriate frequency is present to cause excitation in the telecom service transponder ID device. The resonator and transponder devices preferably have very high impedances at all frequencies except at the desired resonant frequency, and thus avoids violation of telephone service standards. The resonator or transponder ID devices may be placed anywhere along the telephone line, but preferably at the customer premises, or in installed equipment utilizing the telephone line. More than one resonation frequency may be implemented with parallel tuned circuits to indicate additional features of service on the telephone line (e.g., the number of services, the existence of a data service, etc.). The frequencies of resonance of the tuned circuits are preferably chosen to exist between the spectrum utilized by the various operating services. The transponder implementation may generate a simple low frequency response signal, or a more sophisticated specific data pattern using amplitude and / or frequency modulation.

A sensor is provided for the detection of a marker in a sample in which the sensor includes a high frequency 500 kHz-1 GHz piezoelectric ceramic resonator, with the system measuring resonant frequency change. In one embodiment, the piezoelectric sensor operates in the thickness extensional (TE) mode, with the high frequency and TE mode permitting fabrication of an exceptionally small size sensor capable of being arrayed in a handheld unit.

A MEMS resonator has a resonator mass in the form of a closed ring anchored at points around the ring. A set of ring comb electrode arrangements is fixed to the ring at locations between the anchor points, to couple the input (drive) and output (sense) signals to / from the resonator mass.

A compact and thin piezo-electric resonator is provided having a high air-tightness and available at a low cost, in which a piezo-electric resonator element is provided in a housing having a structure which permits adjustment of the frequency after sealing the housing. Further, a surface-mounting type piezo-electric resonator is provided, in which a piezo-electric resonator element is provided in a housing, having a structure which permits frequency adjustment through an opening provided in a base or a lid forming the housing.

The invention relates to the field of microwave communication, in particular to a combined filter. According to a combined filter employing a ceramic resonator grooving and coupling mode, each coaxial resonator comprises an open front-end surface of a non-conductive material and the other five surfaces are covered with a conductive material to form a conductive layer; two coaxial resonators at the outmost side comprise electrode surfaces of a signal input attenuator and a signal output attenuator; and coupling grooves are formed between cavity bodies of the coaxial resonators to form coupling of the filter. Adjustment on specific performance parameters of the filter is achieved through adjustment on the lengths of the coaxial resonators and the coupling grooves. The filter has the advantages of low loss and high inhibition; and second harmonics of a product are greatly improved.

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.

A combline filter has a ceramic resonator disposed inside at least one cavity wall. Because the resonator is implemented as a hollow rod, a tuning element may be inserted into an opening on the top of the rod to tune its frequency. A mounting element, inserted into an opening on the bottom of the rod secures its position inside a cavity resonator. Instead of soldering the resonator to the filter's walls, the resonator is supported above a bottom or side wall of the cavity resonator.

A resonator assembly is provided. The resonator assembly includes a conductive housing defining a cavity, and a resonator. The resonator is disposed within the cavity and has a longitudinal bore. A first tuning assembly has a longitudinal bore and is movably disposed along the bore of the resonator. A second tuning assembly is movably disposed along the bore of the first tuning assembly.

The invention is applicable to the field of filters, and provides a ceramic dielectric waveguide filter. The ceramic dielectric waveguide filter includes at least one ceramic resonator. A first blindhole with an upward opening is arranged downward in the upper surface of the ceramic resonator, and a second blind hole with a downward opening is arranged upward in the lower surface. The first blindhole and the second blind hole are oppositely arranged, and the first blind hole and the second blind hole are both used for frequency tuning. On the premise of keeping the working mode frequency ofthe ceramic resonator unchanged, the frequency of part of adjacent high-order modes can be raised and kept away from the working frequency, so as to improve the far end suppression performance of thefilter. In addition, the depth required for the first blind hole of the ceramic resonator provided by the invention can be reduced the under the same design size and working frequency, so that the ceramic resonator can be machined and formed, electroplated and debugged in the later period more easily.

The invention relates to an all-silicon clock generator realized on the basis of a complementary metal oxide semiconductor (CMOS) process. The all-silicon clock generator comprises a temperature compensation current source, a process compensation circuit, a V-I conversion circuit, a loop oscillating circuit and a shaping circuit the output ends of which are sequentially connected, wherein the temperature stabilizing current source is used for providing current after temperature compensation; the process compensation circuit is used for providing voltage for reducing the deviation of the CMOS process; the V-I conversion circuit is used for converting the compensated voltage to current output; the loop oscillating circuit generates clock signals with the corresponding frequency according tothe magnitude of the received current; and the shaping circuit is used for shaping the clock signals and outputting after frequency division. The invention adopts the temperature and process compensation circuits, thus ensuring that the CMOS clock circuit has favorable temperature and process stabilities and also has stronger power-supply rejection capacity. Besides, the circuit structure is simple, and the clock accuracy is high, so that the CMOS clock circuit can be substituted for a quartz crystal oscillator, a ceramic resonator and other circuits and used as a clock source.

A ceramic resonator plugging and soldering machine for plugging the chip is ceramic resonator into leading-wire bar and then soldering it is composed of the chip delivering unit consisting of spiral vibrating delivering device, linear vibrating delivering device, chip feeding rod and rotary disc type chip shifting device, the chip plugging unit consisting of chip holding block and chip plugging rod, the soldering unit, and the dynamic locating unit for leading-wire bar. The PLC is used for data processing and control of all said units.

The invention discloses a double-mode ceramic waveguide filter which adopts two ceramic resonators connected with each other side by side. By adopting the double-mode ceramic waveguide filter providedby the invention, two vertical electromagnetic fields are generated on one ceramic resonator to form two resonant cavities to generate two resonant frequencies respectively, so that the loss ratio ofthe double-mode ceramic waveguide filter is less compared with that of the existing ceramic waveguide filter, and the size of the double-mode ceramic waveguide filter can also be reduced to a half; the side end surfaces, back away from each other, of the ceramic resonator are each provided with a straight line region, the other side end surfaces, facing each other, of the ceramic resonators are each provided with a cross line region, and debugging holes and electric coupling holes are formed in the side surface connecting the two side end surfaces; the centers of the two regions are located in one straight line, the straight line region and the debugging holes are located on one horizontal plane; the electric coupling holes are located below the straight line region and form an included angle of 45 degrees, and the two debugging holes are located on same side of the two ceramic resonators; and the outer surfaces of the two ceramic resonators are wholly metallized to form a metal layer, and a metal layer in the straight line region and a metal layer in the cross line region are removed.

A triple-mode filter is disclosed, the triple-mode filter including a cavity for confining electromagnetic waves and a metallic block acting as a resonator within that cavity. The metallic block does not contact the conductive walls of the cavity, but is instead suspended by a support element. Triple-mode resonators may be combined to produce bandpass filters having three or more poles. In other configurations, triple-mode cavity metallic resonators may be coupled to triple-mode cavity ceramic resonators or to combline resonators to achieve various filtering functions and performances suitable for different applications.

Telephone line service type identification is provided to a telephone technician in the field by the placement of one or more tuned circuit(s) across the telephone line. In one embodiment, an inexpensive tuned circuit such as a ceramic resonator forms a telecom service resonator ID device which is placed across a telephone line, either at the central office or at the customer premises. Injection of a test current at a predetermined frequency, and a suitable amplitude of the same indicates to the technician aspects of telecom service to that particular telephone line (e.g., the existence of POTS, ISDN, and / or xDSL) and or use of the telephone line by a home network such as HPNA. In another embodiment, a telecom service transponder ID device is formed to provide line service identification to an interrogating line technician. The telecom service transponder ID device is activated when the test signal including an appropriate frequency is present to cause excitation in the telecom service transponder ID device. The resonator and transponder devices preferably have very high impedances at all frequencies except at the desired resonant frequency, and thus avoids violation of telephone service standards. The resonator or transponder ID devices may be placed anywhere along the telephone line, but preferably at the customer premises, or in installed equipment utilizing the telephone line. More than one resonation frequency may be implemented with parallel tuned circuits to indicate additional features of service on the telephone line (e.g., the number of services, the existence of a data service, etc.). The frequencies of resonance of the tuned circuits are preferably chosen to exist between the spectrum utilized by the various operating services.

A cavity filter having a ceramic resonator is disclosed. The disclosed cavity filter may include: a housing in which at least one cavity is formed and which has a ceramic resonator held in the cavity; a ceramic ring joined to an upper part of the ceramic resonator; and a cover joined to one side of the housing, where a through-hole is formed in the ceramic resonator to form a penetration from one side to the other side along one direction, and a metal layer is formed on a surface on the one side of the ceramic resonator, on a surface on the other side of the ceramic resonator, and on the inner perimeter of the through-hole. The disclosed cavity filter can provide the advantage that it can be manufactured as a compact structure.

The utility model relates to a new CMOS oscillator circuit, comprising a reference current source, a oscillating circuit and a delay unit wherein, the reference current source provides offset current to the oscillating circuit; the oscillating circuit generates a oscillating signal after receiving the offset current. The oscillating signal is changed into periodic signal after shaping and delaying by the delay unit while generates a feedback signal to the oscillating circuit. The oscillating signal with stable frequency is continuously output by the oscillating circuit under the offset current and the feedback signal to realize the continuous stable operation of the CMOS oscillator. The utility model has advantages that the combined circuit structure of threshold voltage current source and oscillating circuit allows good temperature property and high power supply suppressing ability, low power consumption, and a substitute of the ceramics resonator, crystal and crystal oscillator module, and a clock source.

The invention relates to an oscillator circuit structure which comprises a reference voltage module, a voltage stabilization module, a calibrated current source module and an oscillation module. The reference voltage module provides reference voltage for the voltage stabilization module, the calibrated current source module and the oscillation module; the voltage stabilization module provides working power source voltage for the calibrated current source module and the oscillation module; and the calibrated current source module provides a charge current source for the oscillation module. The oscillator circuit structure effectively reduces influence of changes of the power source voltage and environment temperature on frequency of an oscillator which is built in a complementary metal-oxide-semiconductor transistor (CMOS) integrated circuit so as to utilize the influence to provide a high-precision and high-stability clock for circuit working without needing to be externally connected with a quartz crystal resonator or a ceramic resonator, removes cost of a peripheral cell, reduces manufacturing and packaging cost of the COMOS integrated circuit, improves market competitiveness of a product, and is simple in structure, low in cost and wide in application range.

A piezoelectric ceramic composition mainly contains a component of the formula SrBi2Nb2O9 and includes Si in a proportion of more than 0 mol and equal to or less than about 0.3 mol relative to 1 mol of Bi in the main component of the formula. This piezoelectric ceramic composition can be fired at lower temperatures, exhibits a practicable electromechanical coefficient kt even when fired at firing temperatures of 1100 ° C. or less, and is useful as materials for piezoelectric ceramic filters, piezoelectric ceramic oscillators, piezoelectric ceramic resonators, and other piezoelectric ceramic devices. By using the piezoelectric ceramic composition, satisfactory piezoelectric ceramics can be obtained.

An elastic wave filter device has a center frequency of a reception frequency band. A plurality of parallel arms are connected to a portion of a series arm on a second signal terminal side of a portion in which a first series-arm resonator is provided. Series-arm resonators among the plurality of series-arm resonators other than the first series-arm resonator include a series-arm resonator having a resonant frequency higher than the resonant frequency of the first series-arm resonator. The resonant frequency of the first series-arm resonator is equal to the reception frequency band.

A differential crystal oscillator electronic circuit. Embodiments of the present invention include circuits comprising two substantially similar oscillator circuits. The oscillator circuits may be coupled to a common crystal or ceramic resonator. Embodiments of the present invention are especially well suited to implementation within integrated circuits where their superior common mode and supply rejection function beneficially in opposition to the naturally high coupling characteristics of integrated circuits. Further, by naturally furnishing differential signals, these low noise signals may be used directly by other differential circuits on an integrated circuit, without requiring additional single ended to differential conversion circuitry.

The ceramic resonator comprises: a cover plate, an intermediate splint, a backboard and a piezoelectric ceramic. The manufacturing method comprises: 1) according to the requirement of product, making the cover plate, backboard and intermediate plate; 2) after binding the cover plate with the intermediate splint on the worktable by using dedicated sticking, the piezoelectric ceramic vibrator is placed in the hole of the intermediate splint, then it is putted on the dedicated sticking worktable to bind with the backboard; after heating, forming a laminate sheet; 3) according to the size requirement of the product, the laminate sheet is cut into the product units; 4) the product units are putted into the dedicated evaporation clamper to make evaporation of end-face electrode in order to make the electrode of piezoelectric ceramic on-state to the external electrode.

Disclosed are embodiments of ceramic radiofrequency filters advantageous as RF components. The ceramic filters can include a ceramic stepped impedance resonator, wherein the inner diameter of the ceramic stepped impedance resonator can vary from one end to another end. The inner diameter can be, for example, tapered, sectioned, or stair-stepped in order to provide different impedances in the ceramic resonator.

There is provided a resonator having a piezoelectric ceramic resonator which has excellent free-fall resistance. The resonator comprises a piezoelectric ceramic resonator 2 with a vibrating electrode formed, and a substrate 3 which supports the piezoelectric ceramic resonator 2, wherein the piezoelectric ceramic resonator 2 satisfies the condition of U≧0.88×H+20.28, wherein U=maximum elastic energy (kJ / m3) per unit volume, and H=drop height (m) (H>1). The present invention can be applied to a resonator 1, wherein the substrate 3 has terminal electrodes 31, 32, and the piezoelectric ceramic resonator 2 is in electrical continuity with the vibrating electrode and is supported on the substrate 3 at both ends via a conductive stator 4.

A ceramic resonator radio frequency filter includes a printed circuit board, one or more first coaxial resonators disposed on the printed circuit board, and one or more second coaxial resonators disposed over the one or more first coaxial resonators so that the one or more first coaxial resonators and one or more second coaxial resonators are arranged in a stacked configuration. The one or more first coaxial resonators and second coaxial resonators electrically connected to the printed circuit board.

An elastic wave filter device has a center frequency of a reception frequency band. A plurality of parallel arms are connected to a portion of a series arm on a second signal terminal side of a portion in which a first series-arm resonator is provided. Series-arm resonators among the plurality of series-arm resonators other than the first series-arm resonator include a series-arm resonator having a resonant frequency higher than the resonant frequency of the first series-arm resonator. The resonant frequency of the first series-arm resonator is equal to the reception frequency band.