299 results about "RF and microwave filter" patented technology

A method of designing a microwave filter using a computerized filter optimizer, comprises generating a filter circuit design in process (DIP) comprising a plurality of circuit elements having a plurality of resonant elements and one or more non-resonant elements, optimizing the DIP by inputting the DIP into the computerized filter optimizer, determining that one of the plurality of circuit elements in the DIP is insignificant, removing the one insignificant circuit element from the DIP, deriving a final filter circuit design from the DIP, and manufacturing the microwave filter based on the final filter circuit design.

A microwave filter is formed from an electromagnetic band gap structure. The electromagnetic band gap structure includes a periodic array of metal features (16, 42, 44, 50) formed within a dielectric matrix (14, 52). A defect feature (17, 48) is formed within the periodic array of metal features (16, 42, 44, 50) in order to create a pass band within a stop band region.

The invention provides a dual-mode microwave filter, comprising a rectangular resonator of length l, height b, and width a operating in two distinct modes (m, 0, n) and (p, 0, q) from a single family of modes and presenting the same direction as the E field, and wherein coupling and mode excitation discontinuities are inductive and in the same direction.

A method of designing an acoustic microwave filter comprises selecting a filter section based on frequency response requirements. The filter section includes an input, an output, and a plurality of circuit elements. The circuit elements have at least in-line acoustic resonators or in-shunt acoustic resonators. The method further comprises selecting a value for each circuit element, selecting a number of filter sections, and cascading the selected number of filter sections to create a cascaded filter circuit design, such that at least one pair of immediately adjacent filter sections are connected to each other via their inputs or their outputs. The method further comprises adding parasitic effects to the cascaded filter circuit design to create a pre-optimized filter circuit design, optimizing the pre-optimized filter circuit design to create a final filter circuit design, and constructing the acoustic microwave filter based on the final filter circuit design.

A three dimensional (3D) fractal structure with H as the mother element is hereby disclosed. Such a 3D structure can act as selective total microwave reflectors or selective microwave filters in transmission. When excited through current injection, such a 3D fractal structure can act as highly efficient antenna for radiating or detecting pre-determined microwaves, with the relevant wavelength much larger than the size of the radiation or detection structure.

A microwave filter comprising a plurality of resonator cavities (1, 10) arrangement in more than two adjacent rows and more than two adjacent colunms; each resonator cavity is coupled with at least a sequential adjacent resonator cavity for providing a main path for an electromagnetic energy to be transmitted from a first resonator cavity (1) to a last resonator cavity (10). The electromagnetic energy is injected in the first resonator cavity (1) by an input terminal (20) through an input coupling and the electromagnetic energy is extracted from the last resonator cavity (10) by an output terminal (21) through an output coupling, the first (1) and last (10) resonator cavities are non-sequential adjacent cavities.

The invention relates to the technical field of coaxial resonant cavity microwave filters and duplexers, in particular to a coaxial resonant cavity mixed coupling method. The method is characterized in that: a conductor shell is arranged; at least two resonant cavities are arranged in the conductor shell; the top of the conductor shell is sealed by a conductor cover plate; a conductor resonant rod is arranged in each resonant cavity, wherein the upper end of the conductor resonant rod is provided with a cavity and the lower end of the conductor resonant rod is in a rod body structure, the bottom end of the rod body structure is fixedly arranged in the resonant cavity through a fastening screw to form a vertical structure with the bottom surface of the resonant cavity, and the conductor resonant rod is a conductor and is contacted with the conductor shell to form short circuit; a tuning screw is arranged on the conductor cover plate; the tuning screw is adjusted from top to bottom and extends into the cavity body on the upper end of the conductor resonant rod; and the electromagnetic coupling intensity between the resonant cavities is finely tuned through a fine tuning screw. According to the coaxial resonant cavity mixed coupling method, the frequency selection characteristics of the filters and the duplexers are improved.

The invention discloses a microwave filter auxiliary debugging method based on kernel machine study, which mainly solves the problem that the prior art that does not construct a relationship model between the bolt adjustment amount and variable quantities of a coupling matrix. The method comprises the following steps: extracting the coupling matrix and processing data according to parameters of afilter S in engineering measurement to obtain normalized data sample sets of the bolt adjustment amount and the variable quantities of the coupling matrix; constructing the model of the influences ofthe bolt adjustment amount on the variable quantities of the coupling matrix by using the kernel machine study algorithm according to the sample sets; constructing an optimal adjustment model of the bolt adjustment amount of the filter according to the study model of the machine; and solving the optimal adjustment model to obtain the adjustment amount of each adjusting bolt of the filter. The method can rapidly and accurately carry out auxiliary debugging of the filter, and can be used for auxiliary debugging of mass-produced filters.

The invention discloses an inductance coupling device for a TE01delta mode dielectric resonator, relating to a radio frequency and microwave filter in the technical field of wireless communication. The inductance coupling device comprises a traditional tuning screw (1), a nut (2), a dielectric tuning disk (3), a resonator (4), a base (5), a low-loss screw (6), a cavity (7), a cover plate (8), and a coupling window (10). The inductance coupling device is characterized by being provided with an inductance coupling ring (9) and an earthing screw (11); the coupling ring (9) is in a bending shape to be not less than 1 / 4 circular and not more than 1 / 3 circular and is attached to the resonator (4); and the coupling ring (9) is fixed on the cavity (7) through the earthing screw (11). The inductance coupling ring for enhancing coupling is only provided, thus the inductance coupling device is simply realized and brings certain convenience for the design of the filter; and the inductance coupling ring is used to remarkably improve the coupling amount between the dielectric resonators and conveniently realizes the control over the coupling amount.

The invention provides a method and apparatus for a adaptively predistorted filter which has a transfer function that satisfies performance criteria specified for at (east one property of the filter. The transfer function is obtained by adaptively predistorting the transfer function poles to meet the performance criteria such that at least one of the poles is shifted by a unique amount.

Multi-function receivers are disclosed in which high dynamic range active microwave filters using nanoscale devices are disposed within a switched channelizer stage. In an embodiment the receiver includes an input low noise amplifier, a switched channelizer comprised of active filters utilizing nanoscale devices, an output amplifier, a mixer, and an analog to digital converter. Additionally, the use of highly selective active filters in the channelizer allows for the optional elimination of the mixing stage, improving cost and overall volume.

A microwave filter has a plurality of resonators and at least one transmission line mounted on a substrate having a ground plane. The filter can have input and output couplings that are transmission lines formed on the substrate or it can have input and output probes. The resonators have one or more gaps extending entirely therethrough, the gaps splitting the resonators into two or more slices. The transmission lines extend into the gap to couple energy into or out of a resonator or between two adjacent resonators. The transmission lines can have tapered ends or can be located off center so that they are closer to one side of a gap than to another side.

In wireless communications, many radio frequency bands are used. For each frequency band, there are two frequencies, one for transmitting and the other for receiving. As the band widths are small and separation between adjacent bands is also small, many band pass filters with different band pass frequencies are required for each communication unit such as mobile handset. The invention provides tunable film bulk acoustic resonators TFBARs containing semiconducting piezoelectric layers and methods for tuning and adjusting the resonant properties. When a DC biasing voltage is varied, both the depletion region thickness and neutral region thickness associated in the semiconducting piezoelectric layers varies leading to changes in equivalent capacitances, inductance and resistances and hence the resonance properties and frequencies. A plurality of the present TFBARs are connected into a tunable oscillator or a tunable and selectable microwave filter for selecting and adjusting of the bandpass frequency by varying the biasing voltages.

Microwave transmission unit, especially a microwave filter (1), and including a cabinet (2) with a first coaxial connector (3) and a second coaxial connector (4), where both coaxial connectors include an inner conductor (6) and an outer conductor (7), said cabinet (2) being made of a non-conducting material, such as plastics, and coated with a metal layer. The microwave transmission unit (1) includes a lightning conductor (5) which is dimensioned so as to conduct lightning current without being damaged to any serious extent, and which is electrically connected to the outer conductor (7) of the first coaxial connector (3) and to the outer conductor (7) of the second coaxial connector (4).

An acoustic microwave filter comprises an input and an output, and a plurality of acoustic resonators coupled between the input and the output. The difference between the lowest resonant frequency and the highest resonant frequency of a plurality of resonators in the filter is at least 1.25 times the frequency separation of the resonator with the highest resonant frequency in the plurality of resonators. Another acoustic microwave filter comprises an input and an output, and a plurality of acoustic resonators coupled between the input and the output to form a passband. The frequency difference between a local minimum or a local maximum of a return loss magnitude of the acoustic microwave filter and the edge of the passband is at least once the frequency separation of the resonator with the highest resonant frequency.

The invention discloses an automatic assembling technology and device of a microwave filter tuning screw. The device comprises a machine frame module, a gasket feeding module, a nut feeding module, a tuning screw feeding module, a machine vision module, a platform module and an assembling mechanical arm module. A nut, a gasket and a screw are used for finishing the feeding action at the same time, the efficiency is extremely high, and the nut, the gasket and the screw are positioned at the same time through detachable product jig; the two-step strategy is adopted in the feeding method of the screw, and by means of a material pipe, the whole automatic assembling device is not directly provided with vibrating discs comprising the tuning screw, the structure is simple, the stability of the whole device is high, and the stability and the reliability of the whole device are prevented from being affected by vibration of the vibrating discs; the defects that the efficiency of an existing manual work assembling mode is low, the error rate is high and the homogeneity of products is poor are overcome, and a foundation is laid for the follow-up automatic adjusting resonant frequency procedures of a microwave filter.

A method of designing an acoustic microwave filter in accordance with frequency response requirements comprises generating a modeled filter circuit design having a plurality of circuit elements comprising an acoustic resonant element defined by an electrical circuit model that comprises a parallel static branch, a parallel motional branch, and one or both of a parallel Bragg Band branch that models an upper Bragg Band discontinuity and a parallel bulk mode function that models an acoustic bulk mode loss. The method further comprises optimizing the modeled filter circuit design to generate an optimized filter circuit design, comparing a frequency response of the optimized filter circuit design to the frequency response requirements, and constructing the acoustic microwave filter from the optimized filter circuit design based on the comparison.

A slot-line dual-band bandpass filter comprises a microwave medium dielectric slab substrate, upper microstrip transmission lines and lower slot-line resonators. A third spiral slot-line stub and a first spiral slot-line stub are loaded to a first open ring slot-line resonator to form an open ring slot-line resonator with the loaded spiral slot-line stub. A fourth spiral slot-line stub and a third spiral slot-line stub are loaded to a second open ring slot-line resonator to form an open ring slot-line resonator with the loaded spiral slot-line stub. The two open ring slot-line resonators with the loaded spiral slot-line stub are coupled to input and output feeders by means of clearance coupling and vertical coupling. The slot-line dual-band bandpass filter allows for independent control of central frequency of two bands and circuit miniaturization; power carrying capacity of the microwave filter is improved; microwave filter bandwidth control is realized; stop-band characteristic of the filter is improved effectively; the slot-line dual-band bandpass filter is compact in design and easy to integrate.

The embodiment of the invention provides a photoelectric oscillator. The photoelectric oscillator comprises a swept source, a phase modulator and a band-stop optical filter. The phase modulator carries out phase modulation for a swept-frequency optical signal to generate a first intermediate signal with positive and negative first-order sidebands; the band-stop optical filter filters away any sideband in the first intermediate signal; the photoelectric detector is connected with the band-stop optical filter to receive an output signal of the band-stop optical filter, to convert the output signal into a periodic swept-frequency microwave signal with the central frequency adjustable and to feed the periodic swept-frequency microwave signal to the phase modulator after the periodic swept-frequency microwave signal is amplified; the swept source, the phase modulator and the band-stop optical filter compose a band-pass swept-frequency microwave filter; the central frequency of the band-pass swept-frequency microwave filter is equal to the difference between the central frequency of the swept source and the central frequency of the band-stop optical filter. Therefore, the embodiment of the invention solves the technical problem of how to generate the periodic swept-frequency microwave signal with low phase noise, good correlation and adjustable central frequency.

The invention discloses an optoelectronic oscillation loop-based microwave two-third frequency division method, which comprises the following steps: performing primary carrier suppression optical double-sideband modulation on a photocarrier by use of a microwave signal to be subjected to frequency division, then performing secondary carrier suppression optical double-sideband modulation on a primarily modulated optical signal by use of an oscillation signal, converting a secondarily modulated optical signal into an electrical signal by use of a photodetector, causing the electrical signal to pass through a microwave amplifier, a phase shifter and a microwave filter, dividing the electrical signal into two paths as an oscillation signal and two-third frequency division output respectively,and forming positive feedback oscillation in a two-third frequency division oscillation mode in an optoelectronic oscillation loop, thereby obtaining stable two-third frequency division output. The invention also discloses an optoelectronic oscillation loop-based microwave two-third frequency division device. According to the method and the device, two-third frequency division of any microwave signal can be implemented in an optical domain, and the advantages of great bandwidth, low noise, low spur and little interference to the outside are achieved.

A microwave bandstop filter having a magnetic strip formed over dielectric material. The magnetic resonant frequency is controlled by an induced magnetic anisotropy in the magnetic strip of the microwave bandstop filter. The magnetic anisotropy field is induced by an anisotropic surface texture formed on the surface of the magnetic strip itself, or formed on an underlying layer. Alternatively, the anisotropic surface texture could be formed on both an underlying layer and on the magnetic strip itself. This induced magnetic anisotropy field allows the resonant frequency of the microwave filter to be controlled over a wide frequency range and make high frequency operation possible without reliance on the application of an externally applied magnetic field.

The present invention provides an SSPPs type microwave band-pass filter, and relates to the microwave filter technology field. The filter adopts a three-segment type structure, the first segment is a coplanar waveguide segment, the second segment is a transition segment transformed from the coplanar waveguide segment to an SSPPs segment, and the third segment is the SSPPs segment, wherein the SSPPs segment adopts a novel child-mother composite groove structure characterized by arranging the child groove structures which are periodic, are in mirror symmetry and are arranged parallelly in the mother grooves. By the number and the geometric sizes of the child grooves, the sub-wavelength bound effect of a microwave electric field can be improved further, and the band-notched characteristic of the SSPPs filter is more excellent. The filter can be widely used in the microwave communication systems, such as the micro-strip circuits of L-wave band to X-wave band, a microwave base station, etc.

The invention provides a dual-mode microwave filter, comprising a rectangular resonator of length l, height b, and width a operating in two distinct modes (m, 0, n) and (p, 0, q) from a single family of modes and presenting the same direction as the E field, and wherein coupling and mode excitation discontinuities are inductive and in the same direction.

The invention provides an auxiliary debugging method and equipment for microwave filters and storage equipment. The method comprises the following steps of: obtaining a dissipation parameter through changing a bolt length of a microwave filter in electromagnetic simulation software or a screw length of a practical filter, so as to form sample data; extracting a mixed element from the dissipation parameter; obtaining a data set Data between a mixed element feature and the screw length; training the data set to establish a reverse electromechanical characteristic model Dmodel between the mixed element feature and the screw length; and inputting an ideal mixed element designed by a generalized Chebyshev synthetic method into the model to obtain an ideal length of the screw. The auxiliary debugging method and equipment for microwave filters and the storage equipment are used for realizing an auxiliary debugging method for microwave filters. The method provided by the invention is capable of shortening the debugging time and improving the debugging efficiency.

The present invention relates to a method of constructing a microwave filter (1, 10) comprising a plurality of coupled resonators (2) and to a microwave filter manufactured by the method. A microwave filter (1, 10) is constructed by providing a plurality of individual resonators (2) and mechanically connecting the plurality of resonators (2) to form the filter (1, 10). Each of the resonators (2) is formed in one piece at least with a bottom wall (4) and a sidewall (5) laterally encircling the bottom wall (4) and extending upwardly therefrom. Furthermore, a plurality of coupling means (7, 11) is provided between the individual resonators (2). Accordingly, a microwave filter (1, 10) manufactured by the method comprises a plurality of coupled resonators (2) mechanically connected to form the filter (1, 10), wherein each of the plurality of resonators (2) is formed separately in one piece at least with a bottom wall (4) and a sidewall (5) laterally encircling the bottom wall (4) and extending upwardly therefrom, and wherein a plurality of coupling means (7, 11) is provided between the individual resonators (2).

The invention discloses a quadruplicated frequency injection locking photoelectric oscillator. The quadruplicated frequency injection locking photoelectric oscillator comprises a dual-parallel mach-zehnder modulator (DPMZM), a light source, a photoelectric detector, a phase shifter, a microwave filter, a microwave amplifier and a power divider, wherein one radio frequency input port of the DPMZM is connected with a single-frequency injection signal, the light source is used for providing a light carrier for the DPMZM, an input end of the photoelectric detector is connected with an output end of the DPMZM by a fiber delay line, the phase shifter is used for adjusting a phase of an electrical signal, the microwave filter is used for filtering the electrical signal and is a narrow-band filterof which passband is around a quadruplicated frequency of the single-frequency injection signal, the microwave amplifier is used for amplifying the electrical signal, the power divider is used for dividing the electrical signal into two paths after the phase shifter, the microwave filter and the microwave amplifier, one path is input to the other radio frequency input port of the DPMZM, and the other path is used as an oscillation signal output of the quadruplicated frequency of the single-frequency injection signal. By the quadruplicated frequency injection locking photoelectric oscillator,stable output of the quadruplicated frequency of the injection signal can be achieved, and the quadruplicated frequency injection locking photoelectric oscillator is simple in structure and low in implementation cost.

The invention discloses a photoelectricity oscillator based on narrow-band double-peak phase shift fiber bragg grating and a method thereof. The photoelectricity oscillator based on the narrow-band double-peak phase shift fiber bragg grating and the method thereof comprise a wavelength tunable laser, a polarization controller, a single-arm Mach-Zehnder modulator, an erbium-doped fiber amplifier, the narrow-band double-peak phase shift fiber bragg grating, a high-speed photoelectric detector, a microwave amplifier and a microwave coupler. The wavelength tunable laser, the polarization controller, the single-arm Mach-Zehnder modulator, the erbium-doped fiber amplifier, the narrow-band double-peak phase shift fiber bragg grating and the high-speed photoelectric detector are sequentially connected through optical fibers. The high-speed photoelectric detector, the microwave amplifier, the microwave coupler and a radio frequency input end of the single-arm Mach-Zehnder modulator are sequentially connected through microwave coaxial lines. An output port of the microwave coupler is a microwave signal output end. According to the photoelectricity oscillator based on the narrow-band double-peak phase shift fiber bragg grating and the method thereof, long optical fibers and a high Q value high pass microwave filter needed in a traditional photoelectricity oscillator to improve signal Q values and purity of frequency spectrum are avoided. Meanwhile, the photoelectricity oscillator based on the narrow-band double-peak phase shift fiber bragg grating and the method thereof have the advantages of being simple and compact in structure, easy to integrate and the like.

The invention discloses a wideband continuously tunable photoelectric oscillator based on excited Brillouin scattering effect, aiming at providing a wideband continuously tunable photoelectric oscillator. A carrier wave of a light single-sideband modulation signal in the photoelectric oscillator is subjected to phase shift by the excited Brillouin scattering effect in an optical fiber; the change of the phase shift quantity of a microwave signal in an annular cavity of the photoelectric oscillator is realized through beat frequency of the carrier wave of the light modulation signal and a positive first-order sideband or a negative first-order sideband in the position of a light detector; and the continuously tunable wideband of the output signal frequency of the photoelectric oscillator is finally realized in combination with a tunable microwave filter at the same time.

A microwave filter is provided that includes a transmission line having a signal input port and a signal output port, a stub connected to the transmission line between the input port and the output port, and a spurline embedded in the stub. The microwave filter is configured to substantially attenuate a frequency while substantially passing at least one predetermined odd harmonic of the frequency.