325 results about "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 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 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.

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.

The invention discloses a microwave photon filter of a multi-wavelength light source and a tuning and reconfiguring method of the microwave photon filter. The microwave photon filter of the multi-wavelength light source comprises a multi-wavelength light source generator and a microwave filter device. The microwave filter device comprises a phase modulator, an adjustable dispersion compensator, a first erbium-doped optical fiber amplifier, a photoelectric detector and a vector network analyzer. A comb-shaped optical fiber of the multi-wavelength light source generator is a programmable optical filter. By observing response curve of the network analyzer, dispersion value of the adjustable dispersion compensator is adjusted, time delay between adjacent optical wavelengths of adjacent multi-wavelength light is changed continuously, and central continuous tuning of the microwave photon filter can be realized. The number of comb-shaped pass bands is set by the programmable optical filter to change the number of emitting wavelengths, and adjustment of the bandwidth of the microwave photon filter is realized. Tunable capacity and reconfigurability of the microwave photon filter are realized, and the microwave photon filter can be more flexibly used for the microwave signal processing system.

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.

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 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 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.