109 results about "Coaxial resonators" patented technology

A radio frequency (RF) coaxial resonator feeding a saltshaker-like gas distributing electrode assembly forms a capacitively coupled plasma source. This apparatus can generate plasma of high density over a wide pressure range and large process window. The system may be used as a remote radical-rich plasma source for materials surface processing.

The present invention incorporates triple-mode, mono-block resonators that are smaller and less costly. The size reduction has two sources. First, the triple-mode mono-block resonator has three resonators in one block. This provides a 3-fold reduction in size compared to filters currently used which disclose one resonator per block. Secondly, the resonators are not air-filled coaxial resonators as in the standard combline construction, but are dielectric-filled blocks. The coupling between modes is accomplished by the corner cuts. One oriented along the Y axis and one oriented along the Z axis. In addition, a third corner cut along the X axis can be used. Corner cuts are used to couple a mode oriented in one direction to a mode oriented in a second mutually orthogonal direction. Each coupling represents one pole in the filter's response. Therefore, the triple-mode mono-block discussed above represents the equivalent of three poles or three electrical resonators.

The invention belongs to the field of electromagnetic parameter testing for microwave and millimeter-wave materials, and relates to an open coaxial resonator, in particular to a novel method for testing the microwave complex permittivity of high-loss liquid and powder materials. According to the method, the resonance frequency and quality factor at the front and the back of a tested microwave material are loaded through the open coaxial resonator, a piece of wine glass furniture is arranged on the open coaxial resonator, the thickness of a sample is loaded, and therefore the complex permittivity of the sample to be tested is calculated. A testing system built according to the method comprises the open coaxial resonator, probes, converters from an SMA to another coaxial connector, cables, a vector network analyzer and the wine glass furniture, wherein the six parts are connected to form the system; the length of the part, extending deep into the resonator, of each probe is adjusted through a coupling adjuster; the quality factor of the system is made maximal at a resonance frequency point, and the resonance frequency f0 and quality factor Q0 of the system at the time are recorded; the material to be tested is placed into the wine glass furniture, flatness of the upper surface of the sample is guaranteed, the thickness d of the sample is measured, and the resonance frequency f1 and quality factor Q1 of the system after the sample is loaded are recorded. The complex permittivity of the material to be tested is calculated according to the parameters obtained previously.

The invention discloses a resonator utilizing medium block loading. The resonator comprises a resonance cavity, a resonance rod, a loading round disc, a tuning bolt and loading media. The resonator utilizing medium block loading loads media provided with high dielectric constant between the loading round disc and an upper cover plate of a coaxial resonator, effectively reduces resonant frequency of the resonator, enables size of the resonator to be reduced by over a half at most, achieves miniaturization of the resonator, and effectively saves production cost. Size of the coaxial cavity resonator is reduced, power capacity of the resonator is simultaneously increased, and the coaxial cavity resonator is guaranteed to have the advantage of being high in power capacity. The resonator utilizing medium block loading further has the advantages of metal resonators and media resonators.

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.

The invention provides a system and method of testing complex dielectric constant of a material based on a gradient coaxial resonator. The system comprises the gradient coaxial resonator and a coupling device. The method comprises the steps: 1) testing and recording resonant frequency f0 and quality factor Q0 in a corresponding cavity working mode when no sample is loaded; 2) measuring diameter DSand thickness dS of a sample under test, placing the sample in a sample area, and testing and recording resonant frequency fS and quality factor QS in the corresponding cavity working mode when the sample is loaded; 3) using resonator perturbation theory to calculate complex dielectric constant of the material under test. The system and method have the advantages that high-precision testing of complex dielectric constant at normal temperature is achieved for a microwave dielectric material, required cavity size and sample size for low frequency testing can be reduced, a sealed-bottom tube clamp can also be used to test the complex dielectric constant of liquid and powdery materials.

A large power microwave plasma torch includes a tuned coaxial resonator, a rectangular waveguide with a wavequide / coaxial converting device to be structure blocked up and down by a door-knob block a door-knob structure locked up and down by a door-knob block and a medium line and con closely with top bottom surfaces of the rectangular wavequide, the said resonator is composed of an top and bottom cavities coaxial with the converter and placed at either side of the waveguide and the converter, one end of the inner conductor is plug in the low cavity, the other end passes through the medium single line, door-knob block and the up cavity, a resonator sort circuit piston is set along the axial line between inner and outer conductors, one end of the waveguide is set with a micro wave source and a waveguid a microwave source and a waveguide shout circuit piston at the other.

A RF device such as a tower mounted amplifier (TMA), mast-head amplifier (MHA), or Tower Mounted Boosters (TMB) includes a housing having a plurality of cavities and an input and an output, the input being coupled to the antenna and the output being coupled to a base station. The housing includes a transmission path holding multiple coaxial resonators. The housing further includes multiple receive paths including at least one path having a plurality of cavities, each cavity containing a dielectric resonator. The metallic transmit resonator nearest the antenna input is coupled to the first dielectric resonator via a common resonant wire. The last dielectric resonator in the receive path is coupled to a first metallic resonator of a downstream clean-up filter via another common resonant wire.

The invention discloses a coupling device of a metal coaxial cavity and a medium resonant cavity. A cavity wall is arranged between a metal coaxial resonator and a medium resonator and divides a cavity body into the metal coaxial cavity and the medium resonant cavity. The two cavities are coupled through a reversed-L-shaped coupling window or a 7-shaped window, wherein the reversed-L-shaped coupling window or the 7-shaped window is formed by the cavity wall and the top face and the side faces of the cavity. A good coupling effect can be obtained, meanwhile, the shape of the coupling window is regular, machining process is simple, and production efficiency is high.

The invention discloses a harmonic-suppression differential band-pass filter based on mixed media and an coaxial resonator and solves the problem that a differential filter based on a dielectric resonator in the prior art has poor harmonic wave performance such as a low differential mode stop band width and a low common mode rejection level. The filter disclosed by the invention comprises a metal chamber, two dielectric resonators and one coaxial resonator, two differential excitation structures and multiple microwave coaxial joints, wherein the two differential excitation structures are firmly disposed beside the two dielectric resonators respectively, have a one-to-one correspondence relation, and carry out excitation coupling with the two dielectric resonators according to the Ampere's right handed screw rule; the multiple microwave coaxial joints are disposed on the outer wall of the metal chamber, connected to the two differential excitation structures and used for connection with external communication equipment; and one of the two differential excitation structures is a differential excitation signal input structure, and the other differential excitation structure is a differential excitation signal output structure. The filter disclosed by the invention can improve harmonic wave performance of the differential filter based on the dielectric resonator, which is specifically embodied in increase of the differential mode stop band width and the common mode rejection level.

A radio for use in microwave datalink applications in which a common local oscillator is used for both a final radio frequency (RF) up-converter stage and an initial RF down converter stage. The frequency of the common local oscillator corresponds to an integer multiple of a local oscillator needed for an earlier up-converter or later down converter stage. The circuit can be used to provide a radio frequency carrier in a 30 GHz band using Coaxial Resonator Oscillators (CRO's) that lend themselves to a planar microstrip circuit implementation.

A multi-mode resonator device can be reduced in size even while increasing the number of resonators while including either a semi-coaxial resonator or a coaxial resonator. Coupling between a TEM mode as a resonance mode of the semi-coaxial resonator and a TM mode as another resonance mode can be facilitated, which enables coupling between the resonators at a predetermined coupling strength. Inside a cavity with a cover, a conductive rod and a dielectric core are disposed so as to substantially equalize a quasi-TEM-mode resonant frequency generated by the cavity and the conductive rod and a quasi-TM-mode resonant frequency generated by the cavity and the dielectric core. A coupling adjusting block is arranged at a place where the magnetic field of one of two coupling modes generated by the quasi-TEM and quasi-TM modes is strong and that of the other mode is weak. The invention also provides a filter, duplexer, and a communication apparatus using the resonator device.

The invention discloses a microwave plasma igniter for an automobile engine, which belongs to the technical field of microwave application. The invention provides seven microwave plasma igniters with different structures for the automobile engine igniter, and achieves extreme field intensity at an exciter end by using an electromagnetism principle that the voltage amplitude is maximum at the end of a quarter coaxial resonator. A top structure at the end of an inner conductor can further enhance the field intensity, thereby breaking down surrounding oil gas mixture and generating the plasma and igniting. Afterwards the rapid movement of electrons of the plasma in a combustor quickly realizes the volume combustion of the whole combustor and full combustion of the oil gas mixture. The engine igniter provided by the invention has a similar external profile to the conventional spark plug, and can directly replace the conventional spark plug ignition system on the basis of not changing an engine cylinder structure. The work center frequency is 2.45GHz. The engine igniter is designed integrally, and has the characteristics of high efficiency, low cost, easy mass production and the like.

An ultra wideband dual-frequency combiner includes a combination port (Port 1), a first port (Port 2) a second port (Port 3), two coaxial resonator band pass filters and two direct current channels. The first direct current channel is connected between the first port (Port 2) and the combination port (Port 1). The second direct current channel is connected between the second port (Port 3) and the combination port (Port 1). One end of the first coaxial resonator hand pass filters (610, 611) is electrically connected with the first port (Port 2) via a first blocking capacitor. One end of the second coaxial resonator hand pass filter (620, 621) is electrically connected with the second port (Port 3) via a second blocking capacitor. The other ends of the first coaxial resonator band pass filter and the second coaxial resonator band pass filter are connected with the combination port (Port 1) via a third blocking capacitor. The blocking capacitors are parameter distributed capacitors.

The present invention provides a semi-coaxial resonator and a filter device, which can restrain resonance frequency variation caused by temperature variation without Q value reduction. A resonator (3) which has a gradually reducing diameter from a base to a top part opposite with a cover (8) and is provided with a sphere at the top is provided at a bottom surface of a housing that is closed by the cover (8). An electric wave is transmitted from an input connector (4) to the resonator (3) through a coupling plate (5). The electric wave excited by the resonator (3) is output from a coupling plate (7) and an output connector (6). The linear expansion coefficients of the housing (1) and the cover (8) are larger than that of the resonator (3). A sheath current of the resonator (3) is same from bottom to top so the Q value does not reduce. Because of the sphere at the top, even when a clearance between the cover (8) and the top of the resonator (3) reduces by temperature variation, the top capacitance does not increase. Therefore the resonance frequency variation caused by temperature variation can be restrained.

A method for constructing a distributed element coaxial resonator includes folding a coaxial resonator to provide a structure having a decreased physical length compared to its electrical length. In various embodiments, the resonator is tuned to affect a standing wave when excited by a signal of a specific wavelength. The coaxial resonator includes inner, middle and outer conductor sections, wherein the characteristic impedance is maintained throughout the resonator.

The invention relates to an improved high frequency filter having the following features: the high frequency filter has a transmission behavior with a coupling impedance resonance with at least one null point at a frequency (fs), wherein the null point at the frequency (fs) can be set by specifying and/or preselecting a defined capacitive (12/') and inductive (12/'') coupling between two coaxial resonators (15) directly following one another on a signal path (10).

A coaxial wide-band filter is arranged in a rectangular metal cavity, and comprises an input radio frequency connector, an output radio frequency connector, a plurality of open-ended quarter-wave coaxial resonators arranged on a metal wall at the lower side, coupling short rods, thick rod taps, tuning screws and a cavity covering plate, which the input radio frequency connector and the output radio frequency connector are arranged on a left metal wall and a right metal wall of the cavity, each coupling short rod is arranged between any two adjacent coaxial resonators, the thick rod taps connect conductors inside the radio frequency connectors, an input end resonator and an output end resonator, and the tuning screws are respectively arranged above the opened ends of the coaxial resonators. Due to the adoption of the short rods for coupling, the coupling strength between every two adjacent resonators is largely improved, and a wider transmission band can be achieved. Cross coupling exists between the separated resonators, the filter has asymmetric frequency response, and the suppression degree outside a higher end of the transmission band is high.

A coaxial resonator comprises a housing with walls which are metallically conductive at least on the inner side, with an injection and tapping opening and with a tube rejecting from a wall of the housing into its inner space, being metallically conductive and being conductively connected with said wall. The tube ends at a distance from the inner surface of the opposite wall and comprises a metallic tuning body which is axially displaceable. The risk that intermodulation products are produced which are caused by abraded parts produced during the displacement of the tuning body is prevented in such a way that the tuning body is held coaxially in the tube by way of a rod made of dielectric material, without contacting the tube conductively, and that the end of the rod averted from the tuning body is configured for displacing the tuning body.

Provided are a coaxial resonator as well as a dielectric filter, a wireless communication module, and a wireless communication device, using the resonator, wherein the Q value in a first resonant mode is large, and a space between a resonance frequency of the first resonant mode and a resonance frequency of a second resonant mode is large. The coaxial resonator is provided with a dielectric block, a first inner conductor arranged on the inner surface of a first through hole which is formed from a first main surface to a second main surface opposing thereto of the block, one end of the inner conductor being connected to a reference potential, and an outer conductor arranged on a side surface of the dielectric block so as to surround the first inner conductor and connected to the reference potential, wherein a low-permittivity portion having permittivity lower than that of the surrounding dielectric block is formed between the first inner conductor and the outer conductor in a manner to surround the first inner conductor. Thereby, the coaxial resonator wherein the Q value in the first resonant mode is large and the frequency space between the resonance frequency of the first resonant mode and the resonance frequency of the second resonant mode is large, can be obtained.

The invention discloses a coaxial resonator tuning structure capable of reducing a micro discharging risk. The coaxial resonator tuning structure comprises an end socket and a base, wherein the end socket is divided into a tuned end (11) and a tuning end (12); the base is provided with a hollow pipe (21); and the size of an outer contour of the hollow pipe (21) is consistent with the size of the tuned end (11). The end socket and the base are sleeved coaxially to be arranged in a coaxial resonator so as to form an inner conductor and an outer conductor of the coaxial resonator. According to the invention, under the condition that the coaxial resonator is not disassembled, the frequency of the resonator can be tuned continuously, so that the coaxial resonator meets various requirements of high-power designs.

A mixed-mode cavity filter is disclosed. The disclosed cavity filter includes: at least one first cavity configured to hold a metal coaxial resonator; and at least one second cavity configured to hold a dielectric resonator, where a first coupling window is formed in a wall formed between the first cavity and the second cavity, the first coupling window includes a horizontal window formed parallel to a bottom portion and a vertical window formed perpendicularly to the bottom portion, and the horizontal window and the vertical window overlap each other in at least a partial area. A mixed-mode filter according to an embodiment of the invention can achieve a small size and a light weight while providing low losses.

The measuring device has a microwave measurement field, where two, particularly three microwave resonators with lateral openings are arranged on different positions around the article or the material strand in the circumferential direction of the article or the material strand. The microwave resonators expose the article or the material strand to microwave measurement field on one side. The microwave resonator is designed as an open coaxial resonator. An independent claim is included for a method for testing a longitudinally axially conveyed rod-shaped article or material strand of the tobacco processing industry for testing a position of an object, particularly a liquid-filled capsule, inserted in the article or the material strand.

The present invention relates to a microwave filter comprising a plurality of coupled resonators (2a-2e, 22a-22g), wherein the plurality of coupled resonators (2a-2e, 22a-22g) includes at least one coaxial resonator (2a-2e, 22a-22b, 22g) comprising a housing having a lower end wall (4, 24), a sidewall (5, 25) extending upwardly from the lower end wall (4, 24) and an upper end wall (3, 23) and an inner conductor (6, 26) disposed within the housing and extending upwardly from the lower end wall (4, 24) along the longitudinal axis of the housing. At least one of the coaxial resonators (2a-2e, 22a-22b, 22g) comprises in its lower end wall (4, 24) and/or in its upper end wall (3, 23) a coupling means (7d, 8, 32) for effecting electromagnetic coupling of the respective coaxial resonator (2a- 2d, 22b, 22g) with an adjacent resonator.