246 results about "Stopband" patented technology

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 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 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 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.

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.

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 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 invention discloses a reflection type polarization conversion antenna with an adjustable stop band, which works in an X wave band and is composed of a dielectric substrate, a metal resonance structure layer arranged on one side of the dielectric substrate and a metal reflection layer arranged on the other side of the dielectric substrate, and the metal resonance structure layer comprises two groups of mutually nested symmetrical split circular ring resonance units. Through the technical means of translation, parameter adjustment and the like, the two groups of resonance units generate symmetry difference, so that different resonance units generate mutually counteracted surface current responses at a specific frequency, and a stop band for polarization conversion suppression is formed in a continuous working frequency band; the position and suppression intensity of the stop band can be controlled by adjusting the structural parameters of each resonance unit. While broadband high-efficiency polarization conversion is realized, a tunable narrowband polarization conversion zero point is introduced, and the tunable narrowband polarization conversion zero point has the advantages of simple structure, high regulation degree of freedom and good incident angle stability, and is suitable for communication, radar and signal monitoring systems of millimeter wave and microwave frequency bands.

The application relates to the technical field of tunable N-path filter, in particular to a tunable N-path reflection-free filter and a superheterodyne receiver. The tunable N-path reflection-free filter comprises a signal source, an N-path band-pass filter unit, an N-path band-stop filter unit, an output resistor and a phase-splitting clock generating circuit. The output end of the signal source is connected with one end of the N-path band-pass filter unit and the N-path band-stop filter unit respectively, the other end of the N-path band-stop filter unit is connected with the output resistor, the gate of a plurality of MOS switches in the N-path band-pass filter unit and the N-path band-stop filter unit is connected with the phase-splitting clock generating circuit, and the phase-splitting clock generating circuit outputs a control signal. The tunable N-path reflection-free filter provided by the application has excellent frequency selectivity, can effectively suppress high-order harmonics, and can adjust the passband and the stopband by changing the switching frequency. Meanwhile, the filter can eliminate the reflected signal, prevent the intermodulation interference and gain fluctuation of the mixer and the high-gain amplifier in the system.

This invention discloses a miniaturized, wide-stopband low-pass filter design method, covering 3D model design, simulation optimization, circuit fabrication and testing, and design verification based on dielectric integrated suspension line technology. The core of the low-pass filter design is based on dielectric integrated suspension line technology. Furthermore, the core circuit of this filter employs three layers of surface-mount capacitors and a double-layer spiral inductor to reduce circuit size, while combining a honeycomb structure to extend the stopband. Compared to traditional circuit designs, the implemented filter exhibits self-encapsulation characteristics, achieving low insertion loss and an ultra-wide stopband range, providing an important basis for filter performance optimization.

The invention provides a frequency hopping band elimination filter which comprises a coaxial resonant cavity, a metal resonant column arranged in the coaxial resonant cavity and a digital capacitor array used for frequency tuning. The digital capacitor array comprises a plurality of capacitor chip sets, each capacitor chip set comprises a plurality of capacitor chips, each capacitor chip comprises an upper electrode and a lower electrode which are oppositely arranged, the lower electrodes are directly welded on the end surfaces of the metal resonant columns, the upper electrodes are connected with bonding wires, and the bonding wires are connected with the metal resonant columns. The bonding wire is used for being electrically connected with a control circuit. The digital capacitor is connected with the metal resonance column and the control circuit in a direct welding and gold wire bonding mode, lower and more stable insertion loss is achieved in the aspect of electrical performance, and extremely high connection consistency is ensured in the aspect of mechanical reliability; and a solid physical foundation is laid for the frequency hopping stop-band filter to realize high-Q-value, high-precision and high-reliability frequency tuning in the S wave band.

A filter manufacturing method and a filter manufactured by the filter manufacturing method are disclosed. The filter manufacturing method includes designating a use mode in a resonator to a first resonance mode, in response to designating to the first resonance mode, setting a band selected from a designated first frequency band to a passband in the resonator, switching the use mode in the resonator from the first resonance mode to a second resonator mode, in response to switching to the second resonance mode, setting a band selected from the first frequency band except for the passband to a stopband in the resonator, and manufacturing a primary filter including the resonator to which the passband and the stopband are set.

The invention relates to the technical field of intelligent sensors, in particular to an intelligent inclination angle sensing system and method with low power consumption, high precision and high sensitivity. According to the system, a multi-element sensing assembly is used for synchronously sensing MEMS core and shell double-source temperature, environment acceleration and composite inclination angle signals; the inclination angle signal calculation and error compensation unit executes physical signal conditioning, and filters dynamic vibration noise through frequency domain stop band suppression; a zero drift compensator is adopted, non-linear evolution characteristics of long-term creep errors are reconstructed according to a temperature historical reference sequence, the zero drift distance is calibrated in real time, and reference correction is carried out on an inclination angle signal; and the measurement state management unit monitors amplitude overrun and triggers reporting. Through the multi-source physical error decoupling and zero position self-calibration mechanism, the long-term stable maintenance of the inclination angle measurement basis and the accurate acquisition of the gravity vector in the field environment are realized.

The present application relates to filter device, multiplexer and communication device, provide the filter device of multi-band response with wide band and low loss passband, wide band stopband and narrow band and steep stopband. The filter (1) has: input and output terminal (100, 110);LC parallel resonant circuit (10) has inductor (L1) and capacitor (C1) connected in parallel with each other;And elastic wave series resonant circuit, have series arm resonator (s1, s2) connected in series with each other, LC parallel resonant circuit (10) and elastic wave series resonant circuit are connected in series between input and output terminal (100) and input and output terminal (110).

The invention discloses a steep transition type artificial surface plasmon low-pass filter based on a spur line structure, and belongs to the technical field of low-pass filters, the steep transition type artificial surface plasmon low-pass filter comprises a dielectric substrate, a coplanar waveguide is arranged on the upper surface of the dielectric substrate, and a spur line unit array is arranged on the lower surface of the dielectric substrate; the coplanar waveguide comprises a center conductor belt and grounding belts symmetrically distributed on the two sides of the center conductor belt, L-shaped groove unit arrays are etched on the grounding belts, the L-shaped groove unit arrays are distributed in the length direction of the coplanar waveguide, and each L-shaped groove unit array comprises a filtering unit and transition units symmetrically arranged at the two ends of the filtering unit. The spur line unit array is aligned with the center of the filtering unit on a projection plane perpendicular to the wave propagation direction. According to the steep transition type artificial surface plasmon low-pass filter based on the spur line structure, adjustable dispersion cut-off frequency and sharp transition from a pass band to a stop band are achieved, and meanwhile the structure is simple and miniaturized.

The invention provides a corrugated low-pass filter design method and device.The method comprises the steps that an input matching section used for input waveguide port matching, a main suppression section used for wide stop-band suppression and an output matching section used for outlet waveguide port matching are sequentially arranged in the electromagnetic wave direction to form an arrangement structure, the arrangement structure is symmetrical along the narrow side gap of the first width; arranging the band elimination units in the arrangement structure at equal intervals, determining an initial trend of a main suppression section envelope line by using an incremental function, determining initial trends of input matching section and output matching section envelope lines by using a windowing function, and determining heights of all the band elimination units according to the initial trends; and keeping the height of the band elimination unit unchanged, compressing the narrow-side gap at the center position of the filter from the first width to the second width, and adaptively adjusting the width change of the narrow-side gap to obtain the ripple low-pass filter. According to the invention, an additional impedance converter is not needed, a stop band covering a complete frequency band can be formed, and a high-frequency spurious mode is effectively suppressed.

The utility model discloses a miniaturized LTCC low-pass filter with high out-of-band rejection, and the interior of a ceramic substrate is provided with an inner electrode, three inductors of an inductor layer and three parallel capacitors of a first capacitor layer form three resonators, and three transmission zero points are formed; the second capacitor layer and the third capacitor layer form a cross coupling capacitor, the third capacitor layer and the grounding layer form four grounding capacitors, and the three resonators are connected with one another and form a seven-order low-pass filter together with the four grounding capacitors; the bottom of the ceramic substrate is provided with an external electrode port, the external electrode port comprises two input / output ports and a grounding electrode port, the resonators are connected with the input / output ports, and the grounding capacitor is connected with a grounding point and the ports. According to the technical scheme, high suppression of multiple frequency multiplication is achieved, high-frequency warping points are suppressed, high-frequency stop-band suppression of the filter is improved, and the filter has the advantages of being small in size, low in loss, high in integration level, high in reliability and capable of being produced on a large scale.

The invention provides a dual-passband waveguide filter and a coupling topology thereof, the dual-passband waveguide filter comprises a metal structure, the interior of the metal structure comprises a torispherical cavity and two sections of feed waveguides, the torispherical cavity is divided into four quarter-spherical cavities by partition plate structures, and the quarter-spherical cavities are communicated with the feed waveguides. Every two adjacent quarter spherical cavities are in coupling connection through a coupling window, and the two feed waveguides are respectively in coupling connection with the two opposite quarter spherical cavities through coupling windows. The dual-passband waveguide filter coupling topology comprises a cellular structure with a resonant node and a non-resonant node, a metal structure is in a physical presentation form of the cellular structure, a quarter spherical cavity is the resonant node, a feed waveguide is the non-resonant node, and the metal structure is a metal structure. According to the coupling topology theory, dual-passband band-pass filtering response of any even order can be realized, and limited transmission zeros are introduced into the lower stop band and the upper stop band of the two passbands at the same time, so that the stop band performance of the dual-passband band-pass filtering response is improved.

The invention discloses a single-pole double-throw switch filtering assembly based on an LTCC (Low Temperature Co-Fired Ceramic) technology. A switching circuit and an LTCC resonator are integrated, and the on-off state of a switching diode in the working process is controlled by an externally applied direct current bias voltage. When the diode is in a conducting state, the parasitic inductor and the capacitor form series resonance, and the equivalent coupling admittance converter passing through the resonator can be inverted and equivalent to an open circuit, so that a branch signal is cut off, and channel isolation is realized; and when the diode is in a closed state, the electromagnetic field distribution of the substrate integrated waveguide resonator is not obviously influenced, the filter keeps normal work, and signal passband transmission is realized. According to the structure, on one hand, the SIW waveguide integration form is used for achieving the low insertion loss characteristic; and on the other hand, the stop-band suppression degree is effectively improved by introducing the cross coupling topology. The whole circuit has the advantages of being compact in structure, low in loss, high in isolation degree, excellent in out-of-band rejection performance and the like, and the requirements of 5G and future high-speed wireless communication systems can be met.

The invention provides a third harmonic suppression film microstrip filter based on a mixed structure. Comprising a substrate, a pair of coplanar waveguide feeder lines used for being connected with an external circuit and playing a role in impedance matching, and a plurality of interdigital resonators used for generating passband characteristics of the filter, the hairpin resonator is used for generating a transmission zero point at the low end of the filter to improve low-end stop-band suppression, the 1 / 4 wavelength open-circuit lines are used for suppressing third harmonics of the filter, and the pair of coplanar waveguide feeder lines, the interdigital resonators, the hairpin resonator and the 1 / 4 wavelength open-circuit lines are all laid on the substrate. The plurality of interdigital resonators are located between the pair of coplanar waveguide feeders, the hairpin resonator is located between the plurality of interdigital resonators, the pair of coplanar waveguide feeders is connected with the interdigital resonators at two sides of the plurality of interdigital resonators, and the plurality of 1 / 4 wavelength open-circuit lines are connected with the pair of coplanar waveguide feeders in parallel.

The invention discloses a high-selectivity broadband optical transparent energy selective surface and a control method. The high-selectivity broadband optical transparent energy selective surface comprises a single-layer optical transparent substrate and a parallel circuit structure, the LC series resonance branch is used for forming a fixed stop band in a conventional working state and can form a double-stop-band coupling structure with the field nonlinear device series branch after impedance change under strong electromagnetic attack so as to expand the protection bandwidth, and stable and efficient shielding in the whole target protection frequency band is achieved; and the field-induced nonlinear device series branch is used for performing main shielding and passband adaptive adjustment under strong electromagnetic attack through state switching of the field-induced nonlinear device, that is, the field-induced nonlinear device series branch can change the impedance characteristic under strong electromagnetic field excitation. The LC series branch and the field nonlinear device series branch are integrated on the single-layer light transparent base material, broadband protection performance and low insertion loss which are equivalent to those of a multi-layer or cascade structure are obtained, and meanwhile an extremely small section and a compact structure are achieved.

The invention provides a high-suppression passive reconfigurable intermediate-frequency filter based on a GaAs process, which comprises a high-order reconfigurable low-pass filter unit and a high-order reconfigurable high-pass filter unit which are in cascade connection, and is characterized in that the high-order reconfigurable low-pass filter unit is designed based on a seven-order low-pass elliptic function prototype and comprises a series branch and a parallel branch; the parallel branch comprises an adjustable capacitor and an inductor connected in series, bandwidth mode switching is achieved by adjusting the position of a transmission zero point, a fixed LC resonance circuit is introduced into the series branch to generate a fixed transmission zero point, and out-of-band rejection is enhanced; the high-order reconfigurable high-pass filter unit is designed based on a seven-order high-pass elliptic function prototype and comprises a series capacitor and a parallel grounding branch, and the parallel grounding branch comprises an inductor and an adjustable capacitor which are connected in series and is used for introducing a transmission zero point of a low-frequency stop band. According to the scheme, low insertion loss is kept while bandwidth mode switching is achieved, and the far-end out-of-band rejection capacity is remarkably improved.

The utility model provides a frequency selection surface radome, which belongs to the design field of multifunctional radomes and comprises 15 dielectric layers including four layers of wide-strip dielectric circuit boards, two layers of narrow-strip dielectric circuit boards, four layers of glass fiber reinforced plastics and five layers of low-density foam boards. The two layers of narrow-strip dielectric circuit boards comprise an upper narrow-strip dielectric circuit board and a lower narrow-strip dielectric circuit board; an upper low-density foam board I, upper glass fiber reinforced plastic I and an upper wide-strip dielectric circuit board I are sequentially arranged above the upper narrow-strip dielectric circuit board; an upper low-density foam board II, an upper glass fiber reinforced plastic II and an upper wide-strip dielectric circuit board II are sequentially arranged below the upper narrow-strip dielectric circuit board; according to the utility model, the platform mold and the positioning pin are used for positioning, so that the actual transmission characteristic of the dielectric layer can be closer to an electrical performance simulation result, and the frequency selection characteristics that the dielectric layer can pass in a certain frequency band range, the insertion loss is less than 1.5 dB, the dielectric layer is isolated in a certain stop band range, and the isolation degree is greater than 10dB are realized.

The utility model provides a surface acoustic wave device. The surface acoustic wave device comprises a piezoelectric composite substrate and a metal structure located on the piezoelectric composite substrate. The piezoelectric composite substrate comprises a silicon substrate; the crystal elastic constant of the silicon substrate is a six-order matrix Cij, 0lt; i < = 6, 0lt; j < = 6, and i and j are integers; the silicon substrate has an Euler angle, and the absolute value of C15 in an elastic constant Cij defined by the Euler angle is greater than or equal to 2 * 10 < 9 > Pa. Namely, the Euler angle is set, and the absolute value of the elastic constant C15 of the silicon substrate is defined to be greater than or equal to 2 * 10 < 9 > Pa, so that the parasitic response generated by a high-order stray mode at high frequency is effectively eliminated or reduced, and the suppression capability of a stop band is improved. Compared with the prior art, the surface acoustic wave device provided by the utility model not only has a better inhibition effect on a high-frequency parasitic mode and improves the performance of the device, but also does not occupy the effective area of the device, is beneficial to the miniaturization development of the device, and is simple in process preparation.

The application discloses a waveguide type filtering and limiting integrated HPM electromagnetic pulse protection device and belongs to the microwave technical field.The device comprises a rectangular waveguide shell, N pairs of inductive diaphragms arranged in the internal cavity of the rectangular waveguide shell, N-1 pairs of capacitive diaphragms, and a bias magnetic field generating assembly arranged outside; and YIG ferrite sheets are embedded in two pairs of the capacitive diaphragms. The inductive diaphragms and the capacitive diaphragms are arranged in the rectangular waveguide, and the YIG ferrite material is loaded in the capacitive diaphragms, so that the wide band frequency domain filtering protection is realized. Meanwhile, the transient nonlinear loss effect generated by the non-uniform precession of the magnetic moment of the YIG ferrite sheet is utilized, so that the high limiting isolation degree protection of the HPM electromagnetic pulse in the working bandwidth is realized. The application realizes the HPM electromagnetic environment protection function compatible with the frequency domain and the power domain in one microwave device, greatly reduces the volume of the whole microwave front end protection device, effectively reduces the loss in the system working passband, and meets the compactness requirement of the microwave receiver in the HPM electromagnetic environment.

The application provides a high-selectivity and simple-structure filter power amplifier and radio frequency integrated circuit, and relates to the field of power semiconductor devices.The application provides stable gate and drain bias voltages for the power amplifier transistor through a gate DC bias network and a drain DC bias network, and guarantees stable operation of the device.The input end and the output end impedance matching network are symmetrically arranged around the power amplifier transistor, both of which contain the same filter impedance transformer, and the layout is compact and simple, without additional independent filter module, effectively simplifying the circuit structure and improving the miniaturization level.Further, the filter impedance transformer is formed by cascading two λ / 4 parallel coupled microstrip lines and is matched with a λ / 2 open microstrip line, and based on the transmission line impedance transformation principle, the filter impedance transformer realizes fundamental real impedance matching, reduces signal transmission loss, forms transmission zero points in the stop band, and significantly improves the frequency selectivity.The overall circuit has high integration, excellent performance, and good engineering application and promotion value.

The invention relates to the technical field of communication, and discloses an antenna, an antenna array, a wireless communication module and a terminal. The antenna comprises a first radiating body and a second radiating body, wherein the first radiating body and the second radiating body are connected with the same feeding point. A working passband of the antenna includes a resonant frequency of a fundamental mode of the first radiator. The resonant frequency of the fundamental mode of the first radiator is different from the resonant frequency of the fundamental mode of the second radiator. And in a frequency band between the resonant frequency of the fundamental mode of the first radiating body and the resonant frequency of the fundamental mode of the second radiating body, the first radiating body and the second radiating body form constant-amplitude anti-phase current. Therefore, the current of the first radiating body and the current of the second radiating body can offset each other to form a radiation zero point, and the radiation zero point is used for forming a working stop band of the antenna. The antenna has a good suppression effect on signals of a working stop band, so that the coupling degree of the antenna and other antennas in the working stop band is small, the isolation degree is high, and interference between the antennas is avoided.

Microacoustic metamaterial filters for use in electronic devices are provided. The filters include an acoustic metamaterial transmission line and two acoustic metamaterial reflectors. The filters do not employ resonators and can be easily fabricated. The center frequency of the filter passband, and filter bandwidth is not limited by material properties. The filters can be very small, because stopbands are used to attain large out of band rejection without requiring more filter stages. The filters can be used for 5G or 6G wireless communications, and for other types of electronic filters.