412 results about "Stopband" patented technology

The invention relates to a miniaturized millimeter wave filtering magnetoelectric dipole antenna with high out-of-band rejection, and relates to the technical field of communication antennae, and the miniaturized millimeter wave filtering magnetoelectric dipole antenna with the high out-of-band rejection effect comprises a strip line feed structure which is used for generating a lower stop band radiation zero point; the n-shaped feed structure is used for feeding the magnetoelectric dipole; according to the magnetoelectric dipole radiator, a U-shaped groove is etched in a dipole patch, so that the size of the antenna is reduced; the parasitic metal strips are used for enhancing the radiation suppression effect of the upper stop band; the folding split rings are folded to reduce the size of the split rings and enhance the radiation suppression effect of the lower stop band at the same time; the inverted L-shaped short circuit branch is used for enhancing the radiation suppression effect of the upper stop band, the absolute bandwidth of the antenna is 21.1 GHz to 31.0 GHz, the relative bandwidth is 37.0%, the lowest gain is 5.0 dBi, the highest gain can reach 7.8 dBi, the suppression level from the in-band highest gain to the radiation zero point of the upper stop band is larger than 40 dBi, and the suppression level from the in-band highest gain to the radiation zero point of the lower stop band is larger than 50.0 dBi.

The invention relates to the technical field of wireless communication, in particular to a wide-stop-band filtering coupler based on a rectangular coaxial structure, which comprises a rectangular coaxial outer conductor upper cavity, an inner conductor circuit and a rectangular coaxial outer conductor lower cavity, and is characterized in that the inner conductor circuit is arranged between the rectangular coaxial outer conductor upper cavity and the rectangular coaxial outer conductor lower cavity through a medium supporting block; the inner conductor circuit comprises an input port, a straight-through port, a coupling port, an isolation port and a branch line coupler structure. Four ports of the branch line coupler structure are respectively in coupling connection with the input port, the straight-through port, the coupling port and the isolation port through a quarter-wavelength open-circuit parallel coupling line structure. The novel rectangular coaxial transmission line is adopted for design, so that the circuit has the advantages of the rectangular coaxial metal transmission line, the electromagnetic shielding structure enables the circuit not to be easily interfered by external electromagnetic wave signals, and the rectangular coaxial transmission line can control the impedance requirement by changing the proportion of the inner conductor and the outer conductor according to different design requirements.

The embodiment of the invention provides a gap waveguide cavity filtering power divider, and belongs to the technical field of filtering power dividers, the gap waveguide cavity filtering power divider comprises a device body, a first slot, at least two second slots and a cover plate, the device body is provided with an input waveguide interface and at least two output waveguide interfaces; the first slot is arranged on the device body, and the first slot is connected with the input waveguide interface; the at least two second open slots are formed in the device body, the second open slots are connected with the output waveguide interfaces in a one-to-one correspondence mode, the first open slots are connected with the second open slots respectively, and the opening directions of the first open slots and the second open slots are located on the same side of the device body; the cover plate is arranged on the device body, and is configured to define a first waveguide resonant cavity with the first slot and define a second waveguide resonant cavity with the second slot. The gap waveguide cavity filtering power divider provided by the embodiment of the invention is simple in structure, can reduce the insertion loss, and has better stop-band performance.

The invention relates to the technical field of frequency conversion, in particular to a radio frequency microwave signal modulation method and system, and the method comprises the following steps: detecting the ratio of the time domain peak interval to the frequency domain main sideband energy of a radio frequency signal, inputting the time domain peak interval and the frequency domain main sideband energy into a cross-correlation algorithm for synchronism analysis, extracting the periodic characteristics of a time domain peak sequence, and obtaining a frequency domain peak sequence; and generating an energy coupling factor based on a difference operation result of the frequency domain energy density gradient value and the time domain peak interval. According to the method, periodic characteristics are analyzed and extracted through the ratio of peak spacing to main sideband energy to generate an energy coupling factor, a main frequency point offset and an energy tilt vector are fused to generate a harmonic tendency parameter, an interference source path is positioned by combining a frequency trajectory vector, and disturbance levels are divided by clustering energy and harmonic parameters. And a conflict direction is pre-judged and stop band parameters are pre-loaded by grey prediction of a main sideband frequency difference value trend, and a closed-loop regulation and control system is constructed to improve the anti-drift capability and reduce the spectrum conflict risk.

An IPD high-selectivity band-pass filter based on a weak coupling transformer technology comprises an LC parallel resonance circuit, an LC series resonance circuit, an LC parallel resonance circuit and a fourth capacitor C4, and inductors in the LC parallel resonance circuit and inductors in the LC parallel resonance circuit have a weak transformer coupling relation; the coupling coefficient required by the weak coupling transformer provided by the invention is very small and can be realized in a mode of adjacently placing metals on the same layer, so that the structural complexity of the filter is effectively reduced; the band-pass filter is based on an IPD technology, an extra decoupling equivalent inductor is introduced through a weak transformer coupling technology, the extra decoupling equivalent inductor and a parallel capacitor which is connected between the input end and the output end of the filter in a bridging mode form a new resonance path, and a transmission zero point is introduced into an upper stop band and a lower stop band of the filter respectively to improve the selectivity of the filter. According to the invention, the selectivity of the filter can be effectively improved on the premise of not additionally introducing an inductance element and not increasing the order of the filter.

The present invention relates to the field of electronic devices of wireless communication systems. Disclosed is an ultra-wideband and high-protection-efficiency filtering energy selective surface, comprising one or more layers of reflecting surfaces; each reflecting surface is mainly composed of a plurality of metal sheets which are located on the same plane, have the same shape and are arranged in central symmetry; a gap for electrical isolation is formed between every two adjacent metal sheets; each gap is provided with a PIN diode; the anodes and cathodes of all the PIN diodes are arranged in a clockwise or counterclockwise direction; and all the gaps form an interconnected gap structure on the plane where the reflecting surface is located. The ultra-wideband and high-protection-efficiency filtering energy selective surface can be achieved by a first-order filtering energy selective surface unit or a second-order filtering energy selective surface unit. The filtering energy selective surface of the present invention has a small surface thickness and a simple structure, can achieve fast roll-off filtering for low-power signals, achieve an ultra-wide suppression stopband, and achieve ultra-wideband and high-efficiency protection for high-power electromagnetic waves.

The invention discloses a broadband reflection-free filtering antenna which is provided with a stop-band energy absorption structure, a high-low impedance microstrip line and a yagi-like radiator which are connected in sequence. The yagi-like radiator is composed of a pair of dipole arms and two pairs of bilateral parallel parasitic patches. Wherein the stop-band energy absorption structure is composed of two microstrip line band-stop filters, two grounded chip resistors, a section of folded phase line and a section of input microstrip feeder line. The two microstrip band-stop filters are respectively connected with a grounded chip resistor, and the two microstrip band-stop filters are connected through a folding phase line. The antenna is high in structural compactness, and meanwhile, the integrated design of the filter and the antenna and the ultra-wide non-reflection bandwidth are realized.

The invention relates to a circularly polarized quasi-absorption filtering phased-array antenna. A unit of the antenna comprises a multi-layer dielectric substrate, a semi-cured layer, a metal floor, a stacked patch and an orthogonal H-shaped gap, the first dielectric substrate is provided with a parasitic square loop, the second dielectric substrate is provided with a cross-shaped strip, and radiation zero points are introduced to the upper and lower edges of a passband respectively; the 3dB orthogonal directional coupler and the L-shaped feeder form a feed network, circularly polarized radiation is realized through slot coupling, and an isolation port of the 3dB orthogonal directional coupler is connected with a 50-ohm resistor, so that the energy of a lower stop band is absorbed, the energy of an upper stop band is reflected, and a quasi-absorption filtering characteristic is presented; the antenna is compact in structure and easy to process, has wide axial ratio bandwidth and good filtering performance, and when array scanning is 0-45 degrees, the overlapping impedance bandwidth is 12%, the axial ratio bandwidth is 15.8%, and the maximum scanning loss is 2.3 dB; the antenna is compact in structure and easy to process, has wide axial ratio bandwidth and good quasi-absorption filtering performance, and has huge potential in millimeter wave satellite communication application.

The invention discloses a dual-band non-reflection filter based on a loaded composite spur line structure, which adopts an annular plane microstrip cascade coupling microstrip line structure to realize dual-band filtering response, and loads two pairs of complementary absorption branches to generate a plurality of reflection zero points to realize full-band absorption of signals reflected by an input / output port. A structure based on a composite spur line is loaded at an input / output port to realize higher harmonic suppression, and the spur line generates a stop band effect through coupling between lines, so that suppression of a parasitic passband is realized. In addition, the spur line structure is embedded into the microstrip line, so that the circuit size is effectively reduced, and the insertion loss in a passband can be effectively reduced. The circuit structure provided by the invention not only has the characteristics of simple and compact structure, planarization and easy integration, but also has the advantages of dual-band, band-pass filtering, full-band non-reflection and higher harmonic suppression.

The invention discloses a broadband millimeter wave magnetoelectric dipole filtering antenna unit and a filtering array, the antenna is realized by adopting a multi-layer printed circuit board, and the antenna comprises a radiation layer printed circuit board and a feed layer printed circuit board. The radiation layer printed circuit board is provided with a magnetoelectric dipole radiator, and an electric dipole patch etched with an H-shaped gap reduces the size of the radiator while achieving low-frequency good filtering. A substrate integrated waveguide (SIW) cavity is arranged around the magnetoelectric dipole radiator, so that surface waves are suppressed, and the overall suppression effect of a stop band is enhanced. A strip line fed by a coaxial probe and a shielding SIW cavity structure are integrated on a feed layer printed circuit board, and the feed structure generates two radiation zero points at high frequency, so that good filtering response is realized. The antenna provided by the invention has the advantages of wide frequency band, small size, high out-of-band rejection level and frequency selectivity.

The invention provides an on-chip terahertz band-pass filter based on an artificial surface plasmon high-order mode, and the on-chip terahertz band-pass filter comprises a dielectric substrate, a feed microstrip line, a first transition structure, a short-branch artificial surface plasmon transmission region, a second transition structure, and a long-branch artificial surface plasmon transmission region. Feed microstrip lines are arranged at the two ends of the front face of the dielectric substrate respectively, each feed microstrip line is sequentially connected with a first transition structure, a short-branch artificial surface plasmon transmission area and a second transition structure, and a long-branch artificial surface plasmon transmission area is located in the middle of the front face of the dielectric substrate. Two ends of the long branch artificial surface plasmon transmission region are respectively connected with a second transition structure, and the whole back surface of the dielectric substrate is covered with a metal layer as a metal ground; the wide-stop-band microstrip antenna has the advantages of being wide in stop band, easy to machine, small in transmission loss and small in crosstalk, does not need punching operation, and is convenient to machine.

The invention provides a filtering patch antenna based on three-dimensional packaging integration, which mainly comprises five layers of dielectric substrates, four layers of bonding plates and an integral circuit structure, the whole circuit structure comprises a signal transmission metal column, a coupling strip line, a quarter-wavelength strip line resonator, an open-circuit strip line branch knot, a feed strip line, a microstrip patch, a grounding metal column and a grounding plate. The novel filtering antenna provided by the invention has the characteristics of high integration level, miniaturization, high selectivity, wide stop band and packaging, and can be well applied to the field of wireless communication systems.

A resonant ultrasound spectroscopy-based nondestructive testing apparatus and method for a lithium battery. The apparatus comprises a sweep-frequency signal generation module, a power amplification module, a transmitting ultrasonic transducer, a receiving ultrasonic transducer, a pre-amplification module, a data acquisition module and a lock-in amplification module. The testing method comprises: amplifying the power of a sweep-frequency signal to serve as an excitation signal of a transmitting transducer, and using same to perform lock-in processing on a signal received by a receiving transducer, so as to obtain transmitted and reflected wave-based resonant ultrasound spectra at different positions of a lithium battery; identifying a plurality of resonance frequencies from the resonant ultrasound spectra, and analyzing resonant ultrasound spectrum features and the passband and stopband features within a resonant ultrasound spectrum signal; extracting from the resonant ultrasound spectrum signal amplitude information of transmitted waves at different frequency points to obtain an amplitude cloud map of the transmitted waves of the lithium battery at the plurality of frequency points and a mechanical quality factor of the lithium battery; and detecting a failure state of the lithium battery, and quantitatively evaluating the SoC of the lithium battery.

The invention discloses a multi-band filter S parameter testing method and system based on segmented scanning, and relates to the technical field of radio frequency microwave testing. The method comprises the following steps: controlling a digital channel board card to drive a radio frequency switch through an upper computer, expanding radio frequency ports of a vector network analyzer, and enabling the number of the radio frequency ports to be matched with that of filter ports to be tested; test channels are divided according to the number of filter ports and test requirements, a segmentation parameter table and calibration parameters are configured for each channel, the segmentation parameter table comprises sub-segment scanning parameters, and the number of sub-segment scanning points is adjusted according to passband and stopband characteristics; the vector network analyzer performs segmented scanning on each channel based on the parameters; and the upper computer obtains the S parameter curve from the vector network analyzer to complete the test. The method can improve the S parameter testing efficiency and precision of the multi-band filter, and is suitable for mass production testing.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The disclosure provides a method and a device for filtering-based channel estimation. A method comprises configuring a filter design with a stopband region between at least two bandpass regions in a time domain associated with channel behavior, suppressing, via the filter design, multi-user interference (MUI) or orthogonal cover code (OCC) interference in the time domain, and providing frequency domain-based channel estimation (CE) based on the filter design.

The invention discloses a stop-band residual compensation method and device of a digital filter, a storage medium and a computer program product, and relates to the technical field of audio signal processing, and the method comprises the steps: collecting an original audio signal and a digital filtering signal; the digital filtering signal and the original audio signal are synchronously input into a pre-constructed stop-band residual noise dynamic compensation model to be processed, a smooth transition signal is obtained, and the stop-band residual noise dynamic compensation model takes a hardware filtering signal output by a hardware simulation filter as a target label; and superposing the smooth transition signal and the digital filtering signal according to a preset superposition proportion to obtain a calibration signal. The stop-band residual noise dynamic compensation model learns smooth transition characteristics when the hardware simulation filter reproduces parameter adjustment, and the flexibility of the digital filter is considered, so that the response speed when the digital filter adjusts the cut-off frequency in real time at high frequency is improved, and the stop-band residual energy at the moment of cut-off frequency adjustment is inhibited.

The invention relates to a combiner, a radio frequency system and communication equipment, and the combiner comprises a first frequency division unit which is used for carrying out the frequency division processing of an electromagnetic wave signal received by a common end, so as to output a first frequency band signal through a first output end; the second frequency division unit is used for performing frequency division processing on the electromagnetic wave signal received by the common end so as to output a second frequency band signal through a second output end; the first stop band unit is connected with the first frequency division unit and is used for generating a zero point of a stop band in the frequency range of the second frequency band signal; the second stop band unit is connected with the second frequency division unit and is used for generating a zero point of a stop band in the frequency range of the first frequency band signal; wherein the first frequency division unit, the second frequency division unit, the first stop-band unit and the second stop-band unit respectively comprise a plurality of components, the components are capacitors or inductors, a plurality of discrete capacitors and inductors can be adopted, and compared with an LTCC combiner in the related technology, the hardware cost of the combiner can be greatly reduced.

The invention discloses a self-packaging filtering slot antenna based on a folded substrate integrated waveguide cavity. The self-packaging filtering slot antenna comprises a first metal layer, a first dielectric substrate, a second metal layer, a second dielectric substrate, a third metal layer, a third dielectric substrate, a fourth metal layer, a fourth dielectric substrate and a fifth metal layer, the first metal layer is arranged on the upper surface of the first dielectric substrate; the second metal layer is arranged on the upper surface of the second dielectric substrate; the third metal layer is arranged on the upper surface of the third dielectric substrate; and the fourth metal layer and the fifth metal layer are respectively arranged on the upper surface and the lower surface of the fourth dielectric substrate. The novel filtering antenna provided by the invention has the characteristics of miniaturization, high selectivity, wide stop band and self-packaging, and can be well applied to the field of wireless communication systems.

The invention discloses a wide-stop-band reflection-free double-frequency filter, particularly relates to the technical field of microwave communication, and solves the problems that in the prior art, a double-frequency-band filter usually has signal reflection outside a working frequency band, and a small number of reflection-free double-frequency-band or multi-frequency-band filters are often complex in structure and low in cost. The technical problems of large size, poor absorption effect and poor high-stop-band effect of a non-reflection dual-band filter in the prior art, and certain out-of-band rejection performance and insertion loss are sacrificed while the non-reflection dual-band filter pursues the non-reflection characteristic, and particularly, harmonic suppression is poor in a transition area of two frequency bands and a high-stop-band area are solved. According to the technical scheme, a quarter-wavelength coupling microstrip line MCL1 and a quarter-wavelength microstrip line ML2 are connected in series, and a three-quarter-wavelength microstrip line ML1 and a three-quarter-wavelength microstrip line ML2 are introduced and connected in parallel to form a dual-frequency band-pass filtering response; according to the invention, a good full-band absorption effect is achieved, and the frequency selectivity of in-band signals is also enhanced.

A multi-band antenna includes a first column of radiating elements that are configured to operate in a first operating frequency band mounted on a reflecting plate; a second column of radiating elements that are configured to operate in a second operating frequency band mounted on the reflecting plate; a first fence and a second fence located on both sides of the reflecting plate that extend forward from the reflecting plate, where the first and second columns of radiating elements are arranged in between the first and second fences, the first fence and the second fence respectively comprise a frequency selective surface with a passband and a stopband, the passband covers at least the first operating frequency band, and the stopband covers at least the second operating frequency band.

A method and device for filtering-based channel estimation. A method comprises configuring a filter design with a stopband region between at least two bandpass regions in a time domain associated with channel behavior, suppressing, via the filter design, multi-user interference (MUI) or orthogonal cover code (OCC) interference in the time domain, and providing frequency domain-based channel estimation (CE) based on the filter design.

The invention discloses a hybrid cascade band-pass frequency selective surface with flexibly designed pass-stop bands, and belongs to the technical field of electromagnetic fields and microwaves. The frequency selective surface is composed of two layers of structures, wherein the upper layer is of a grid square ring structure, and the lower layer is of a double-square ring structure. Under the condition that an additional electromagnetic structure is not introduced, the equivalent interlayer spacing of the upper-layer structure and the lower-layer structure is increased through staggered design of the upper-layer unit and the lower-layer unit, and the large-angle stability of the frequency selective surface is improved. According to the frequency selective surface, stable transmission performance of electromagnetic waves can be achieved within the frequency band of 3.3-3.8 GHz under the condition of different polarization and angle incidence, meanwhile, the frequency band where the pass-stop band of the frequency selective surface is located can adjust the side length size of the related square ring structure to achieve flexible design, and the frequency selective surface has the advantages of being simple in structure, low in cost and easy to popularize. The frequency selective surface has a transmission zero point outside a passband, so that a good stop-band characteristic can be realized.

The invention provides a cavity filter, and relates to the technical field of filters. The cavity filter comprises a shell part, the shell part is constructed to form a first cavity and a second cavity, and a first coupling window is constructed between the first cavity and the second cavity. Wherein the first cavity is internally provided with a 1 / 4 wavelength resonance unit, and the second cavity is internally provided with a first coupling resonance unit and a second coupling resonance unit which are symmetrically arranged about the longitudinal center plane of the second cavity. The 1 / 4 wavelength resonance unit comprises a first cylinder and a second cylinder which are coaxially arranged, and the diameter of the first cylinder is larger than that of the second cylinder. The first coupling resonance unit comprises a first resonance part and a second resonance part, and the impedance of the first resonance part is larger than that of the second resonance part. The second coupling resonance unit comprises a third resonance part and a fourth resonance part, and the impedance of the third resonance part is larger than that of the fourth resonance part. The cavity filter provided by the invention has the advantages of wide stop band and miniaturization.

The invention discloses an ultrahigh-scanning-rate leaky-wave antenna based on double-layer offset quasi-complementary SSPP. The antenna comprises a dielectric substrate, double-layer single-side offset quasi-complementary SSPP structures on the upper surface and the lower surface of the dielectric substrate, a double-layer mode conversion structure and a dielectric substrate top layer periodic modulation branch knot. Wherein the longitudinal symmetry axis of the dielectric substrate top layer single-side strip SSPP unit and the longitudinal symmetry axis of the dielectric substrate bottom layer single-side slot SSPP unit are relatively offset, and a double-layer single-side offset quasi-complementary SSPP unit is jointly formed; the double-layer mode conversion structure is composed of a trapezoidal gradual change structure on the top layer of the dielectric substrate and a periodic gradual change slotting structure on the bottom layer of the dielectric substrate; and the dielectric substrate top layer periodic modulation branch knot is formed by compounding a rectangular structure and a semicircular structure loaded at the tail end of the rectangular structure, and is positioned on the opposite side of the top layer single-side strip SSPP structure. The wide-angle scanning ultra-narrow band-pass filter has the advantages of wide-angle scanning, ultra-narrow working bandwidth, ultra-high beam scanning rate and open stop-band suppression, and has very high practical potential in the fields of radar, imaging and the like.

An ESA antenna includes a layer of filters between the layer of radiating elements and the ground layer. The filter layer obviates certain post processing steps. The filters define a passband at the operating range of the antenna and a stopband defined to prevent crosstalk or reduce known external interference. Each filter includes alternating cells of a resonator cell formed by two split ring resonators and a resonator cell formed by a complementary split ring resonator and a complementary patch / stub. A particular implementation of the filter defines an operating range around 23 gigahertz with a passband to stopband transition of less than 500 megahertz. Vias may connect the filter layer to a surface component layer with beamforming integrated circuits, bypassing the routing layer.

The invention belongs to the technical field of microwave communication, and relates to a coaxial double-stop-band filter, which comprises an inner conductor, an outer conductor, an insulating medium body, a signal input port and a signal output port, and is characterized in that the inner conductor is coaxially sleeved in the outer conductor, and the insulating medium body is positioned between the inner conductor and the outer conductor; two ends of the inner conductor are respectively connected with signal connecting ends of the signal input port and the signal output port; the outer conductor comprises a metal cylinder, the two ends of the metal cylinder are fixedly connected with the signal input port and the signal output port respectively, two defected ground structures which are symmetrically distributed relative to the central plane of the outer conductor are arranged on the metal cylinder, and each defected ground structure comprises a first gap and three second gaps which are arranged in parallel at intervals. The length direction of the second gaps is parallel to the axial direction of the metal cylinder, and the three second gaps are communicated through the first gap. The dual-band interference suppression performance is excellent, the passband insertion loss is low, the structure is novel, the power capacity is large, and processing is easy.

The invention provides a power distribution network broadband dynamic harmonic pure real number measurement method and system. The method comprises the steps of obtaining a measurement electrical quantity discrete sampling sequence in a power grid; constructing a discrete signal measurement model based on the obtained measurement electrical quantity discrete sampling sequence in the power grid, and calculating a filter bank based on the discrete signal measurement model; further calculating a measurement initial value; starting iterative calculation, judging whether an iteration upper limit is reached or not, if so, directly outputting a measurement result, and if not, calculating frequency response, and updating filter bank pass band and stop band frequency response according to the frequency measurement result; estimating a measurement error based on the updated frequency response; performing error compensation on each order derivative of the composite modulation component based on the estimated measurement error to obtain each order derivative of the composite modulation component of the mth component; and based on each order derivative of the composite modulation component of the mth component, identifying each order derivative of the amplitude and the phase, and obtaining output results of the amplitude, the phase and the frequency of the broadband dynamic harmonic wave of the power distribution network.

The invention belongs to the field of antennas, and particularly relates to a topological leaky-wave antenna based on gyromagnetic photonic crystals. A single gyromagnetic YIG column is adopted to construct square primitive cells, an upper magnet layer and a lower magnet layer are assisted to provide a magnetic field, the primitive cells are adaptively and closely arranged into the array antenna, boundaries in all directions of a rated area are perfect electric conductor boundaries, and a slot array of a leaky wave area is formed in the boundary of an excitation source. According to the topological leaky-wave antenna, leaky-wave scanning regulation and control of the antenna can be carried out through adjustment of parameters such as a magnetic field, an antenna structure and frequency, and the topological leaky-wave antenna has the characteristic of multi-degree-of-freedom adjustment; the waveguide has the advantages that the structure is simple, the transverse emergent effect is good, the open-stop band phenomenon is overcome, impedance matching is overcome, no reflection signal exists, and waves in the waveguide can only be transmitted in a one-way mode. The problem that an existing leaky-wave antenna needs impedance matching and has an open stop band is effectively solved.

The invention provides a grating filtering substrate integrated waveguide slot array antenna and a design method thereof. A radiation slot array antenna is formed by arranging a radiation slot array on a first metal layer on the surface of a substrate integrated waveguide; and secondly, a grating filtering structure is formed by periodically arranging metalized blind hole groups at the bottom of the substrate integrated waveguide, so that a stop band is created in a traveling wave area, a signal filtering and shielding effect is realized in a specific frequency band, the miniaturization of the antenna is realized, the connection loss caused by additionally connecting a filter is avoided, and the efficiency of the antenna is improved. According to the grating filtering substrate integrated waveguide slot array antenna, the selection and propagation of a specific working frequency band are realized by controlling the aperture of the metalized blind hole, the hole pitch of the metalized blind hole group, the line pitch, the waveguide shape and the opening shape of the radiation slot array in the grating filtering substrate integrated waveguide slot array antenna; and the signal anti-interference performance of the grating filtering substrate integrated waveguide slot array antenna is simply and conveniently improved.

A micro-acoustic RF filter comprises first and second ports (101, 102). First and a second signal paths (120, 110) are coupled between the first and second ports and include a corresponding resonator (111, 121). The resonator of at least one of the signal paths is a micro-acoustic resonator. One of the signal paths includes also a phase shifter (232) serially connected with the resonator (111). The micro-acoustic RF filter achieves a broad passband determined by the resonance frequencies of the micro-acoustic resonators. The filter allows flexible adaption of the passband and stopband performance.