55 results about "Passband filter" patented technology

This invention belongs to the field of microwave passive device technology and discloses a dual-passband millimeter-wave filter power divider based on a gap waveguide, comprising a metal bottom cover layer and a metal top cover layer arranged from bottom to top; wherein, the metal top cover layer includes a top cover and a top cover frequency division structure disposed on the top cover; the metal bottom cover layer includes a bottom cover and a bottom cover frequency division structure, a filtering structure, and a power divider network structure disposed on the bottom cover. The dual-passband millimeter-wave filter power divider based on a gap waveguide provided by this invention solves the technical problems of existing dual-passband filter power dividers, such as high design optimization requirements, narrow dual-frequency bands, difficulty in flexibly changing frequency bands, and high processing requirements.

The invention relates to the technical field of communication, in particular to a miniaturized wide-passband filter based on an EMSIW and a microstrip resonator. According to the miniaturized wide-passband filter, the two EMSIW cavities are adopted, the size of the filter can be effectively reduced, high-order modes TE120, TE210, TE220 and TE130 cannot be propagated in the EMSIW cavities, and therefore the filter has a wide stop band. Two microstrip resonators are embedded at a coupling window between two EMSIW cavities, and four-order quasi-elliptical filtering response is realized under the condition that no extra circuit area is occupied. Compared with other EMSIW filters, the filter has the advantages of being small in size, wide in passband, wide in stop band and good in selectivity, and has potential application value in a communication system.

The embodiment of the utility model relates to the technical field of communication, and particularly discloses a dual-passband filter and communication equipment, the dual-passband filter comprises a substrate and a topological structure, and the topological structure is arranged on the substrate. The topological structure comprises an input end, an output end, a first parallel line, a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line, a first open-circuit branch knot and a second open-circuit branch knot, the input end is connected with one end of the first parallel line, the other end of the first parallel line is connected with the output end, and the output end is connected with the third microstrip line. The other end of the first parallel line, the first micro-strip line, the second micro-strip line and the first open-circuit branch knot are connected in sequence, and one end of the first parallel line, the third micro-strip line, the fourth micro-strip line and the second open-circuit branch knot are connected in sequence. By means of the mode, the topological structure is simple and compact, and miniaturization of the dual-passband filter is facilitated.

This invention relates to the field of dual-passband filter technology and discloses an ultra-narrowband high-temperature superconducting symmetrical dual-channel filter. The invention establishes a high-order coupled topology based on CT and CQ units, enabling free adjustment of the zero positions between the two sub-passbands and the introduction of a pair of transmission zeros out of the dual-passband filter, thus achieving good sideband suppression between sub-passbands and throughout the entire dual-passband filter.

Methods and apparatus for optical filtering are provided. In one example, an apparatus includes a spatial light modulator (102) having a two-dimensional array of square, rectangular, or rhombic pixels, and a controller (110) coupled to the spatial light modulator (102). The controller (110) may be configured to write image data (114) representing an image to the spatial light modulator (102) to control the spatial light modulator (102) to display the image for a frame period, and during the frame period, spatially reposition the image across a plurality of locations over the array of pixels, each single position of the plurality of positions is maintained for a respective time period, wherein the respective time period is selected according to one or more non-negative coefficients of an anti-aliasing filter transfer function (402).

The invention discloses a single-cavity dual-passband SIW filter based on capacitance loading, which comprises a first metal layer, a first dielectric layer, a bonding layer, a second dielectric layer and a second metal layer which are stacked, and a second metalized through hole group with three interference through holes which are sequentially arranged along the Y direction, the second interference through hole is formed in the central axis of the SIW resonant cavity in the Z direction, and the first interference through hole and the third interference through hole are symmetrically formed in the two sides of the second interference through hole; the second dielectric layer is provided with a first metal column and a second metal column, and the first metal column and the second metal column are arranged in a central symmetry mode with the central axis of the second interference through hole as the center. According to the SIW filter provided by the invention, independent adjustment of two passbands can be realized in a single SIW resonant cavity, the requirements of miniaturization and passband selectivity are met, and the utilization rate of a cavity mode is improved.

An optoelectronic oscillator (100) and a signal processing method, which relate to the technical field of optoelectronics. In the optoelectronic oscillator (100), an electro-optical modulator (110), an optoelectronic detector (120), a first filter (130) and a power divider (140) form an optoelectronic oscillation loop. Compared with a conventional single-passband filter, the first filter (130) in the optoelectronic oscillation loop has an additional low-frequency passband, and thus can excite a pulse train of the low-frequency passband and a pulse train of a bandpass band in the optoelectronic oscillation loop. Since the oscillation of a pulse signal can automatically narrow a pulse train to form an ultrashort pulse train, when the pulse train excited by the bandpass band has undergone pulse narrowing by means of an oscillation mechanism in the optoelectronic oscillation loop, the pulse train excited by the low-frequency passband may further undergo pulse narrowing, such that the optoelectronic oscillator (100) can generate a microwave pulse train which is shorter than that of a conventional optoelectronic oscillator, that is, an ultrashort microwave pulse train.

The invention belongs to the technical field of electromagnetic fields and microwaves, and particularly relates to a design method of an asymmetric three-passband filter based on a frequency-variable coupling structure. According to the method, a frequency-dependent coupling structure is applied to the design of the asymmetric three-passband filter based on the REMEZ-like algorithm, and after a frequency-dependent coupling matrix corresponding to a topological structure is converted into a non-frequency-dependent coupling matrix, all unknown parameters of the frequency-dependent coupling matrix are optimized and solved through a constrained nonlinear minimization function; therefore, an original cross coupling path is eliminated; and the generated N-1 transmission zeros can be generated and independently controlled by the frequency-variable coupling structure, so that the topological structure of the filter is simplified, and the debugging complexity is reduced. The three-passband filter with different orders, return losses and bandwidths can be synthesized in different passbands and specified transmission zero points, an in-line topological structure is achieved, the difficulty of filter design and simulation is lowered, and the degree of out-of-band rejection and isolation between the passbands is greatly improved.

The invention discloses a circuit and a method for improving interference of local oscillator phase discrimination stray on a receiver. The circuit comprises a clock input, a local oscillator unit, a filtering and amplifying unit and a frequency conversion unit which are connected in sequence. The filtering and amplifying unit is formed by connecting a pre-amplifier, an adjustable filtering unit and a post-amplifier in series; the adjustable filtering unit comprises a passband filtering and trap wave network to realize secondary suppression. The circuit can dynamically switch paths according to spurious offset, so that phase discrimination spurious is remarkably suppressed at a specific frequency point, local oscillator signals in a wide frequency range are compatible, low insertion loss and power fluctuation are kept, and the contradiction between bandwidth and performance is effectively balanced. The receiver local oscillator is realized by adopting conventional components and switch structures, does not need a special process, is easy to be integrated into an existing receiver local oscillator circuit, and has good compatibility.

Hybrid lattice filters with acoustic baluns are disclosed. In one aspect, a hybrid lattice filter may be formed using acoustic elements. The hybrid lattice filter may operate with acoustic baluns such as coupled resonator filters (CRF) or stacked crystal filters (SCF). To achieve the desired common mode rejection, an additional rejection or low common mode intermediate impedance network may be supplied between the acoustic balun and the hybrid lattice filter. By combining the acoustic balun with the low common-mode intermediate impedance network and the hybrid lattice filter, a passband filter with a desired bandwidth may be created.

The application discloses a dual-passband filter based on a copper-based micro-processing technology, which comprises a coaxial outer conductor and a coaxial inner conductor located inside the coaxial outer conductor, an input end feeder and an output end feeder are connected to the coaxial inner conductor, the coaxial inner conductor comprises a first quarter-wavelength transmission line, a second quarter-wavelength transmission line, a first half-wavelength transmission line and a second half-wavelength transmission line, the first quarter-wavelength transmission line and the second quarter-wavelength transmission line are coupled with the first half-wavelength transmission line and the second half-wavelength transmission line at the same time, and the first half-wavelength transmission line and the second half-wavelength transmission line are coupled with each other. The application has the beneficial effects that the transmission loss is small, and the signal shielding property is high.

The embodiment of the utility model relates to the technical field of communication equipment, and particularly discloses a topological structure, a wide dual-passband filter and communication equipment, comprising a first parallel five-line and a second parallel five-line which are connected in sequence, and a first microstrip line and a sixth microstrip line which are symmetrically connected between the first parallel five-line and the second parallel five-line, the first micro-strip line is symmetrically connected with the second micro-strip line and the fourth micro-strip line, the second micro-strip line is sequentially connected with the third micro-strip line and the first short-circuit branch, the first short-circuit branch is grounded, the fourth micro-strip line is sequentially connected with the fifth micro-strip line and the second short-circuit branch, the second short-circuit branch is grounded, and the sixth micro-strip line is symmetrically connected with the seventh micro-strip line and the ninth micro-strip line. The seventh microstrip line is sequentially connected with the eighth microstrip line and a third short-circuit branch, the third short-circuit branch is grounded, the ninth microstrip line is sequentially connected with the tenth microstrip line and a fourth short-circuit branch, and the fourth short-circuit branch is grounded. Through the above mode, the embodiment of the utility model can obtain the wide dual-passband filter with small size and high selectivity based on the topological structure design.

The invention provides a photoelectric oscillator and a signal processing method. The invention relates to the technical field of photoelectricity, and in the photoelectric oscillator, an electro-optical modulator, a photoelectric detector, a first filter and a power divider form a photoelectric oscillation loop. Compared with a conventional single-passband filter, the first filter in the photoelectric oscillation loop has the advantages that a low-frequency passband is added, and a pulse sequence of the low-frequency passband and a band-pass passband can be excited in the photoelectric oscillation loop. Due to the fact that oscillation of the pulse signal can automatically narrow the pulse sequence to form the ultra-short pulse sequence, on the premise that the pulse sequence excited by the band-pass passband passes through an oscillation mechanism in the photoelectric oscillation loop to narrow the pulse, the pulse sequence excited by the low-frequency passband can further narrow the pulse, and the ultra-short pulse sequence is formed. Therefore, the photoelectric oscillator can generate a microwave pulse sequence which is shorter than that of a conventional photoelectric oscillator, namely an ultra-short microwave pulse sequence.

The invention discloses an AMC loaded dual-passband waveguide filter for satellite communication, particularly relates to the technical field of wireless communication, and solves the problem that although a metal waveguide dual-passband filter is widely applied to the field of satellite communication due to the advantages of low loss, large power capacity, high Qu value and the like in the prior art, the filter cannot be applied to the field of satellite communication. However, the defect of huge volume also exists in the prior art. According to the technical scheme, resonant cavities are arranged, and the two resonant cavities are coupled through a coupling window. The input port and the output port both adopt WR-62 standard waveguides, are externally coupled with the resonant cavity through coupling windows respectively, and are the same in size; the relative size at the first high-order mode is reduced by more than 50%, and a good miniaturization design scheme is shown to meet the application requirement of satellite load miniaturization.

The invention provides a dual-passband filter. The dual-passband filter comprises a top metal layer, an upper dielectric plate, a middle metal layer, a lower dielectric plate and a bottom metal layer which are sequentially stacked from top to bottom, the middle metal layer comprises at least two capacitor loading patches; the metalized through hole array penetrates through the upper-layer dielectric plate and the lower-layer dielectric plate, the top end is connected with the top-layer metal layer, and the bottom end is connected with the bottom-layer metal layer; the at least two short-circuit conductive columns are located below the two capacitor loading patches respectively, the top ends of the short-circuit conductive columns are connected to the capacitor loading patches, and the bottom ends of the short-circuit conductive columns are connected to the bottom metal layer; the top metal layer comprises a resonance part, and the edge of the resonance part is provided with a first window. The dual-passband filter provided by the invention realizes independent regulation and control of dual passbands while satisfying miniaturization.

The application provides a hybrid mode based substrate integrated waveguide dual-passband filter, belonging to the microwave field, comprising a top metal layer, a middle dielectric layer and a bottom metal layer arranged in sequence from top to bottom; the middle dielectric layer is provided with first to fourth resonant cavities in the form of isosceles right-angled triangles formed by uniformly arranged metal via columns along the diagonal and the parallel direction of the side of the middle dielectric layer; two gaps are respectively reserved on the metal via columns between the first resonant cavity and the second resonant cavity, between the second resonant cavity and the third resonant cavity and between the third resonant cavity and the fourth resonant cavity, one of the gaps is located at the right angle of the triangle, and the other gap is located at the middle of the right angle side of the triangle; two metal tuning columns are respectively arranged in the first resonant cavity and the fourth resonant cavity, and one metal tuning column is respectively arranged in the second resonant cavity and the third resonant cavity; the oblique sides of the first resonant cavity and the fourth resonant cavity are respectively connected with a microstrip line on the top metal layer; and the filter realizes the filtering effect of four-order dual-passband under the condition that the size of the filter is unchanged.

The application discloses a kind of topology structure of small center frequency ratio of double-passband filter and filter, and the topology structure includes microstrip line, one end of the microstrip line is symmetrically connected with the one end of first parallel five lines and the one end of second parallel five lines, the other end of the microstrip line is symmetrically connected with the one end of first short-circuit stub and the one end of second short-circuit stub;The other end of the first parallel five lines is connected with input end, the other end of the second parallel five lines is connected with output end, the other end of the first short-circuit stub and the other end of the second short-circuit stub are grounded respectively.The application solves the problem that the center frequency ratio of two channels of existing double-passband filter is large.

The invention discloses an on-chip optical switching structure based on a flat passband filter array and a control method of the on-chip optical switching structure. The on-chip optical switching structure comprises an input / output waveguide array, a wavelength division multiplexing optical switch array composed of flat passband filters and a switch control unit. The control method comprises the steps of coupling multi-wavelength signals through an input / output waveguide array, determining propagation paths of different wavelength signals through a dynamic multi-wavelength routing strategy, demultiplexing the multi-wavelength signals through an on-chip reconfigurable flat passband filter, recombining the signals of different wavelengths of the same target port at the same time, and combining the signals of different wavelengths with the same target port at the same time. And the optical switch array is calibrated by combining optical power measurement signal feedback, so that full-automatic, low-loss and low-crosstalk switching of multi-wavelength high-speed signals is realized. The complexity of the on-chip wavelength division multiplexing optical switch array and the power consumption of a control system can be effectively reduced, and the bandwidth density of a chip is improved.

The invention relates to a flat passband filter circuit based on high-order cascading. The circuit comprises a high-order high-pass filtering module and a high-order low-pass filtering module which are cascaded in sequence to form a one-way processing path from a signal input end to a signal output end. Wherein the orders of the high-pass module and the low-pass module are not less than 6, and the cut-off frequencies of the high-pass module and the low-pass module are respectively set as the lower limit and the upper limit of a passband, so that a flat passband range is cooperatively defined. A Sallen-Key Butterworth structure is preferably adopted, and resistance-capacitance parameters of all levels are optimized, so that the excellent performance that the amplitude fluctuation in a passband is less than + / -0.5 dB and the roll-off rate of a transition band is greater than 80dB / octave is realized while high selectivity is ensured. The filter circuit provided by the invention effectively solves the contradiction between uneven passband and smooth transition band of the traditional band-pass filter, and is suitable for a precision electronic system with high requirements on signal fidelity and adjacent channel suppression.

Methods and apparatus for optical filtering. In one example, a device includes a spatial light modulator having a two-dimensional array of square, rectangular, or diamond pixels, and a controller coupled to the spatial light modulator. The controller can be configured to write image data representing an image to the spatial light modulator to control the spatial light modulator to display the image for a frame period, and during the frame period, spatially reposition the image on the array of pixels over a plurality of positions, each individual position of the plurality of positions being maintained for a respective time period, wherein the respective time period is selected according to one or more non-negative coefficients of an anti-aliasing filter transfer function.

The present invention discloses a bandwidth-reconfigurable low-pass filter, comprising: a resonant circuit, a control circuit, and a filter circuit; wherein the resonant circuit and the control circuit constitute a magnetically coupled resonator; the magnetically coupled resonator is used to generate a tunable zero point to change the passband of the filter; the filter circuit changes its passband based on the tunable zero point generated by the magnetically coupled resonator, with the passband range specifically determined by the tunable zero point; by changing the control voltage of the control circuit to change the tunable zero point, the passband width of the low-pass filter is changed, thereby achieving reconfiguration of the low-pass filter. The present invention utilizes the resonant circuit and the control circuit to form a magnetically coupled resonator. Simply by changing the control voltage introduced by the magnetically coupled resonator, the passband width of the filter can be changed, and the filter has a large reconfiguration range; the magnetically coupled resonator achieves bandwidth reconfiguration using only a small layout area.

According to the present disclosure, an acoustic wave filter is provided. The acoustic wave filter has a pass band and is configured to filter a radio frequency signal. The acoustic wave filter comprises a series resonator and a shunt resonator, the shunt resonator having a primary mode defined by a resonant frequency of the shunt resonator and a secondary mode defined by a longitudinal mode of the shunt resonator, the primary mode defining a lower edge of the pass band and the secondary mode being of a higher frequency than the primary mode. A corresponding radio-frequency module and wireless mobile device comprising said acoustic wave filter are also provided.

This invention discloses a dual-passband filtering balun, relating to the field of radio frequency wireless technology. It includes: a single-passband filtering balun comprising: a top microstrip, ground metal I, ground metal II, a bottom microstrip, and multiple metal vias; a first interlayer dielectric is disposed between the top microstrip and ground metal I, a second interlayer dielectric is disposed between ground metal I and ground metal II, and a third interlayer dielectric is disposed between ground metal II and the bottom microstrip; the multiple metal vias penetrate from top to bottom through the top microstrip, the first interlayer dielectric, ground metal I, the second interlayer dielectric, ground metal II, the third interlayer dielectric, and the bottom microstrip; windows of the same size are drilled at the center of ground metal I and ground metal II; both the top microstrip and the bottom microstrip have two single-passband resonant cavities; a coupling resonant cavity is added below each of the single-passband resonant cavities to obtain the dual-passband filtering balun. This invention provides greater coupling strength and greater design freedom.

The embodiment of the utility model relates to the technical field of communication equipment, and particularly discloses a topological structure, a wide dual-passband filter and communication equipment, which comprise an input end, an output end, a first parallel line, a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line, a first open-circuit branch knot and a second open-circuit branch knot, one end of the first parallel line is connected with one end of the first microstrip line and one end of the third microstrip line, the other end of the first microstrip line is connected with the input end, the other end of the third microstrip line is connected with the second open-circuit branch knot, and the other end of the first parallel line is connected with one end of the second microstrip line and one end of the fourth microstrip line. The other end of the second microstrip line is connected with the first open-circuit branch knot, and the other end of the fourth microstrip line is connected with the output end. Through the above mode, the embodiment of the utility model can obtain a miniaturized wide dual-passband filter based on the above topological structure design.

According to the present disclosure, a passband filter is provided. The passband filter has a series branch, where the series branch comprises a set of one or more resonators having a resonant frequency sufficiently away from the passband of the filter such that spurious modes, of the set of one or more resonators, that are associated with the resonant frequency are outside of the passband of the filter; a set of one or more reactive components in series with the set of one or more resonators, the set of one or more reactive components having a resonant frequency sufficiently away from the passband of the filter such that the spurious modes of the set of one or more reactive components, that are associated with the resonant frequency are outside of the passband, and such that the resulting combined resonant frequency of the series combination of the set of one or more resonators and the set of one or more reactive components is within the passband of the filter.

The embodiment of the present application relates to the technical field of communication, and discloses a filter, the filter comprises a third microstrip line, one end of the third microstrip line is connected with one end of a first parallel line, one end of a second parallel line and one end of a third parallel line, and the other end of the third microstrip line is connected with one end of a third open-circuit branch; the other end of the first parallel line is connected with an input end and one end of a first microstrip line, and the other end of the first microstrip line is connected with one end of a first open-circuit branch; the other end of the second parallel line is connected with an output end and one end of a second microstrip line, and the other end of the second microstrip line is connected with one end of a second open-circuit branch; and the other end of the third parallel line is grounded. Through the above mode, the wide double-passband filter has the characteristics of good selectivity, compact structure, high isolation, small insertion loss, small passband center frequency ratio and the like.

In one implementation, a wireless communication device includes a first transceiver configured to generate a transmit signal and a band pass filter (BPF) select circuit configured to filter the transmit signal by a one of a first BPF with a relatively high-frequency passband or a second BPF with a relatively low-frequency passband. The wireless communication device includes a second transceiver configured to receive a received signal filtered by the other one of the first or second BPF. Having the transmit and received signals filtered by two different passband filters improves the isolation between the transmitter and receiver. Another implementation configures the first transceiver to include its own set of first and second BPFs, and the second transceiver to also include its own first and second BPFs.

The invention provides a high-selectivity dual-passband filter based on a triangular hairpin ring resonator and a manufacturing method, and solves the problems that an existing dual-passband filter is large in circuit size, poor in passband control flexibility and insufficient in selectivity. The filter comprises a transmission line substrate, two microstrip feeder lines, two microstrip feeder lines and two triangular hairpin ring resonators. The resonators are connected through double hairpin structures to form a dual-mode resonator, are symmetrically distributed about the coupling gap, and realize electromagnetic coupling with the transmission line through the coupling gap. Two passbands are respectively formed by odd-mode resonance and even-mode resonance, and a transmission zero point is generated between the passbands by adjusting a coupling gap, so that the isolation and the selectivity are effectively improved. The overall size of the filter is only 17.45 mm * 8.7 mm, the dual-passband characteristic with the center frequency of 4.36 GHz and 6.85 GHz is achieved, the insertion loss is smaller than 0.2 dB, the return loss is superior to-20 dB, and the filter has the advantages of being small in size, high in selectivity, controllable in passband and the like. The method is suitable for the wireless communication fields of double-frequency wireless local area network (WLAN), satellite communication and the like.

The application relates to a miniaturized double-ridge double-mode dielectric waveguide resonator and a filter containing the resonator. The resonator comprises a frequency adjusting blind hole at the center of the upper surface, and upper and lower ridges which are arranged on the left and right sides of the frequency adjusting blind hole and are parallel to each other. The resonator can independently control the main mode and the high-order mode and has the characteristics of miniaturization by using the excellent physical characteristics of the ridge waveguide which has a low main mode cutoff frequency. The application realizes a miniaturized four-order rectangular double-ridge double-mode double-passband dielectric waveguide filter by using the resonator. The double-passband filter controls the main mode frequency by using the blind hole depth, adjusts the high-order mode frequency by using the double-ridge depth, and independently controls the low-frequency and high-frequency coupling coefficients by using the coupling window length and the slot depth, so that the double-mode independent control is realized while the size is small.

An optical data receiver is configured for receiving optical signal comprising spectrally adjacent modulated subcarriers. The optical receiver includes an optical comb generator to output separate frequency tones, and a plurality of optical-to-electrical (OE) converters. The OE converters are configured to mix light of a plurality of the frequency tones with part of the received optical signal, and to output a temporal sequence of measurements of the mixture produced by said mixing. A digital signal processor is configured to recover a data stream carried by one of the subcarriers by performing multi-input multi-output (MIMO) processing using the temporal sequences of measurements output by at least two of the OE converters. The MIMO processing involves performing passband filtering for a passband wherein two of the subcarriers are down-converted by the mixing.