230 results about "Band rejection" 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 discloses an ultra-low profile broadband circularly polarized microstrip patch antenna array and a design method thereof, the antenna array is constructed on a single-layer thin dielectric substrate, and an antenna unit is formed by combining a substrate integrated waveguide resonant cavity and a microstrip patch resonator embedded in the center of the substrate integrated waveguide resonant cavity. On the premise that the antenna size is not increased, the combination of the double resonators is realized. The adjacent antenna units are arranged at zero intervals and share the metal columns surrounding the edge of the substrate integrated waveguide resonant cavity. Two pairs of polarization orthogonal degenerate modes with similar resonance characteristics are introduced by utilizing a central gap, an annular gap and four symmetrical gaps connected with the central gap and the annular gap, so that four resonance points with similar radiation characteristics and similar resonance frequencies and two axial ratio zero points are formed, and synchronous broadening of impedance bandwidth and axial ratio bandwidth is realized. In addition, a radiation zero point is generated at the position close to the upper edge of the passband along the radiation counteracting effect on the two sides of the annular gap, and therefore the out-of-band rejection performance of the antenna is improved.

The invention relates to the technical field of antennas, in particular to a high-isolation double-frequency common-caliber miniaturized phased-array antenna which comprises a high-frequency-band linear polarization end-fire metal patch array structure, a low-frequency-band linear polarization end-fire metal patch array structure, a public metal reflection floor and a single-layer dielectric substrate. Radiation structures of the high-frequency-band linear polarization end-fire metal patch array structure and the low-frequency-band linear polarization end-fire metal patch array structure are formed by improved dipoles of microstrip balun feed with out-of-band rejection, so that linear polarization is achieved, and then the dipoles are fed through the improved microstrip balun with out-of-band radiation rejection. The suppression on high frequency is further deepened and the decoupling bandwidth is expanded; in addition, a decoupling structure is added between the adjacent common-frequency antennas to improve the isolation and radiation capability between the adjacent common-frequency antenna units, high isolation and wide beam coverage of the dual-frequency common-aperture phased-array antenna can be realized, the performance of the antenna is improved, and the dual-frequency common-aperture phased-array antenna is simple in process and low in cost.

A differential feed dual-frequency dual-polarization microstrip filtering antenna comprises three layers of dielectric substrates which are arranged at intervals from top to bottom, and an octagonal annular coupling parasitic structure is loaded on the lower surface of the first layer of dielectric substrate; a rectangular radiation patch is printed on the upper surface of the second dielectric substrate and is loaded with four non-closed rectangular gaps which are distributed in a square shape and are mutually rotationally symmetrical. A cross-shaped parasitic branch knot and four L-shaped symmetrical open-circuit branch knots which are distributed in a rhombus shape and extend outwards along the diagonal direction of the rhombus are printed on the lower surface of the second dielectric substrate layer; the lower surface of the third dielectric substrate is a metal floor; the second layer of dielectric substrate and the third layer of dielectric substrate are connected through a coaxial feeder line; according to the dual-frequency dual-polarization filtering antenna, the mode of combining the differential feed technology and the microstrip antenna is adopted, the design of the dual-frequency dual-polarization filtering antenna with four radiation zero points is achieved, the antenna has good edge selectivity and good out-of-band rejection capacity, in-band gain is stable, and a directional diagram has good symmetry and directionality.

The utility model provides an IPD-integrated bulk acoustic wave filter and wireless communication equipment, and relates to the technical field of semiconductors. The bulk acoustic wave filter integrated with the IPD comprises a substrate, an acoustic wave reflection structure arranged on the substrate, a film bulk acoustic wave resonator, a parallel plate capacitor and a planar inductor, the film bulk acoustic wave resonator is located above the acoustic wave reflection structure, and the planar inductor is located between the film bulk acoustic wave resonator and the parallel plate capacitor. And the thin film bulk acoustic resonator and the parallel plate capacitor are electrically connected with each other. According to the bulk acoustic wave filter integrated with the IPD, the IPD technology is integrated into the BAW technology, and the integration level and the area utilization rate of the filter are greatly improved. A resonance circuit of the IPD is designed to generate an extremely wide passband, then the bulk acoustic wave resonators are designed, and the frequency of the bulk acoustic wave resonators falls on the two sides of the passband to improve roll-off of the filter, so that the wide passband can be generated, and the good out-of-band rejection effect can be achieved. In addition, by adopting the planar inductor, the technological process of the inductor structure is greatly simplified.

The present invention discloses a broadband high-steepness filter based on the embedding of a piezoelectric acoustic resonator and an LC passive circuit, which includes a ladder-type filtering network and an LC resonance network. The ladder-type filtering network and the LC resonance network are connected in series in sequence, or the ladder-type filtering network and the LC resonance network are connected in series at intervals in sequence. The ladder-type filtering network includes a filtering series main path and a plurality of filtering parallel branches. The first end of the filtering series main path serves as the input end, and both ends of the filtering parallel branches are respectively connected to the ground wire and the series main path. At least one series hybrid resonance unit is arranged on the filtering series main path, and the series hybrid resonance unit is used to form poles in the passband to expand the passband bandwidth. At least one acoustic resonator or parallel hybrid resonance unit is arranged on the filtering parallel branch. This filter can achieve a relatively high bandwidth, a relatively high out-of-band rejection, and a relatively narrow transition band.

The invention discloses a high-abrupt-drop high-out-of-band rejection bulk acoustic wave filter circuit structure, which comprises a high-abrupt-drop circuit and a high-out-of-band rejection circuit, and is characterized in that the output end of the high-abrupt-drop circuit is connected with the high-out-of-band rejection circuit in series; the high-steep-drop circuit is a passive device externally expanded on a Ladder bulk acoustic wave filter circuit, and transmission zero point stepped distribution of a near-transmission band is realized; and the high out-of-band rejection circuit is used for externally expanding an inductor on the Ladder bulk acoustic wave filter circuit so as to construct a new transmission zero point of a specific frequency band at the far end of a transmission band to realize high out-of-band rejection. The circuit not only can realize high out-of-band rejection, but also can avoid the occurrence of a large peak at a near transmission band.

The invention discloses a high out-of-band rejection single-layer broadband SIW filter antenna, which comprises a rectangular SIW cavity which is formed on a dielectric substrate and has a plurality of resonant modes, and a first group of short-circuit needles which are used for dividing the rectangular SIW cavity into a left resonant cavity and a right resonant cavity which resonate in a first resonant mode are loaded in the rectangular SIW cavity; a hexagonal groove is etched in the top surface of a left resonant cavity of the rectangular SIW cavity, and a hexagonal microstrip patch resonating in a second resonant mode is embedded in the hexagonal groove; a second group of short-circuit pins used for dividing the right resonant cavity into a first resonant cavity resonating in a third resonant mode and a second resonant cavity resonating in a fourth resonant mode are loaded in the right resonant cavity, a rectangular groove is etched in the top surface of the second resonant cavity of the rectangular SIW cavity, and a U-shaped groove is etched in the position, corresponding to the rectangular groove, of the bottom surface of the second resonant cavity of the rectangular SIW cavity; two radiation zero points are introduced out of band, the filtering characteristic of high out-of-band rejection is achieved, and meanwhile the gain is improved.

The invention belongs to the technical field of microwave circuits, and particularly provides a Z-shaped four-order small band-pass filter based on a quarter mode, so as to realize the performance characteristics of small size, light weight and high out-of-band rejection of the band-pass filter. The invention comprises a port coupling structure, namely an input coaxial port and an output coaxial port; the embedded tuning structure comprises a first tuning blind hole, a second tuning blind hole, a third tuning blind hole and a fourth tuning blind hole; a U-shaped windowing coupling structure; the through holes are positive symmetric short windowing through holes and oblique symmetric long windowing through holes; the Z-shaped filter cavity structure is a cavity with a silver-plated surface. According to the four-order band-pass filter, the high-dielectric-constant material is combined with partial surface silver plating of the cavity, so that a virtual magnetic wall is formed on the non-silver-plated surface to realize a quarter-mode working mode, and tuning and windowing coupling structures are combined to form the four-order band-pass filter. Due to the novel design thought, compared with a traditional full-mode band-pass filter, the full-mode band-pass filter has the advantages that the size and the weight are reduced by about 75%. The invention can be used in communication systems and millimeter wave related applications.

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.

The invention relates to an S-band high-reliability patch filtering antenna, and belongs to the technical field of filtering antennas. The antenna comprises a metal floor, a bottom dielectric substrate and a top dielectric substrate which are sequentially stacked from bottom to top. Wherein the upper surface of the top dielectric substrate is provided with a coplanar coupling structure and a rectangular driving patch provided with a U-shaped groove, and a broadband and a low-frequency radiation zero point are generated; and a rectangular branch is arranged on the lower surface of the top dielectric substrate to generate a high-frequency radiation zero point. The patch filter antenna further comprises a microstrip line used for coaxial feed, and the microstrip line penetrates through the metal floor and the bottom dielectric substrate and is connected with the rectangular branch on the lower surface of the top dielectric substrate. High reliability is achieved through the double-layer dielectric substrate, structure simplification and low cost are achieved through the plane structure, and the working bandwidth, out-of-band rejection and the rectangular coefficient of the patch filter antenna are improved through reasonable arrangement of the parasitic patches.

A multi-band acoustic multiplexer filter circuit is provided. The multi-band acoustic multiplexer filter circuit includes multiple single-band acoustic filters and a multi-band filter circuit that can pass a signal in multiple passbands. In embodiments disclosed herein, the single-band acoustic filters and the multi-band filter circuit can be configured to collectively attenuate the signal in some of the passbands to thereby prevent the signal from becoming a blocking signal to any other passbands (e.g., adjacent passbands). By employing the multi-band filter circuit to provide a portion of the required attenuation to the blocking signal, each of the single-band acoustic filters can be subject to more relaxed attenuation requirements, thus making it possible to reduce complexity of the single-band acoustic filters and improve overall band rejection performance of the multi-band acoustic multiplexer filter circuit.

The invention relates to a surface acoustic wave resonator, a filter, a multiplexer and a radio frequency front-end module. In the surface acoustic wave resonator, at least one of the reflection structures of the surface acoustic wave resonator is modulated, so that the distance between the center lines of the two adjacent reflection electrodes in the reflection structures fluctuates by taking the reflection group as the unit, thereby inhibiting the fluctuation near the upper frequency point of the surface acoustic wave resonator, and improving the performance of the resonator. Besides, the filter provided by the embodiment of the invention comprises the surface acoustic wave resonator, so that the passband performance of the filter can be improved, and particularly, the passband flatness and the out-of-band rejection level can be improved.

The invention provides an optimization method of a surface acoustic wave filter and the surface acoustic wave filter, and the optimization method comprises the following steps: taking the insertion loss of the surface acoustic wave filter as a first optimization target, optimizing a dual-mode surface acoustic wave filter, and obtaining a first optimization result; by taking out-of-band rejection of the surface acoustic wave filter as a second optimization target, optimizing the geometric parameters of the interdigital transducer to obtain a second optimization result; optimizing the capacitance value of the capacitor and the inductance value of the inductor by taking the standing-wave ratio and the ripple of the surface acoustic wave filter as a third optimization target to obtain a third optimization result; and optimizing the surface acoustic wave filter by taking the insertion loss index, the out-of-band rejection index, the standing-wave ratio index and the ripple index of the surface acoustic wave filter as fourth optimization targets to obtain a fourth optimization result. According to the optimization method, the labor cost can be reduced, the probability of falling into a local optimal solution can be reduced, the convergence speed of optimization is improved, and the optimization time is shortened.

A multi-frequency low noise amplifier includes an input matching network, an amplifying circuit and an output matching network. The input matching network includes a first out-of-band rejection circuit and a first frequency band selection circuit. The output matching network includes a second out-of-band rejection circuit and a second frequency band selection circuit. The first out-of-band rejection circuit can reject signal of any frequency band in the radio frequency signals so that signals of the remaining frequency bands can pass through. The first frequency band selection circuit can screen out the signals of reference frequency spots from the remaining frequency bands. The second frequency band selection circuit can screen out the signals of partial frequency spots from the amplified signals of reference frequency spots. The second out-of-band rejection circuit can reject the signal of any frequency spot in the signals of partial frequency spots.

The invention discloses a broadband wearable filter antenna with a high out-of-band rejection level and a wireless communication device, the antenna is composed of two layers of flexible dielectric substrates (a first dielectric substrate and a second dielectric substrate), a polydimethylsiloxane material is adopted, a rectangular radiation patch is loaded on the upper surface of the first dielectric substrate, a radiation zero point is introduced at a low frequency by loading an open annular groove, and the upper surface of the first dielectric substrate is provided with a first dielectric layer and a second dielectric layer; a high-frequency radiation zero point is introduced by loading the T-shaped strip on the upper surface of the second dielectric substrate, the high-frequency out-of-band rejection level is improved by loading the transverse rectangular groove and the longitudinal rectangular groove in the rectangular radiation patch, and the bandwidth is widened through loading of the open annular groove and the T-shaped strip. The antenna is integrally designed to be flexible, is suitable for wearable equipment, and still meets performance requirements after a human body tissue model is loaded. According to the invention, high out-of-band rejection level and broadband filtering performance are realized at the same time.

The invention relates to a tunable filter bank for enhancing out-of-band rejection. The tunable filter bank comprises a first path switching module, a first filter bank, a second path switching module, a third path switching module, a second filter bank and a fourth path switching module, the first path switching module, the second path switching module, the third path switching module and the fourth path switching module are sequentially connected, and the first filter bank is connected between the first path switching module and the second path switching module. And the second filter bank is connected between the third path switching module and the fourth path switching module. The circuit can be equivalent to one or more of a high-pass filter, a low-pass filter, a transmission line and a band-pass filter, can process signal waveforms in different frequency band ranges, and has the characteristics of high control precision and high reliability.

The invention discloses a broadband high-steep-drop filter based on embedding of a piezoelectric acoustic resonator and an LC passive circuit, and the filter comprises a stepped filter network and an LC resonant network, the stepped filter network and the LC resonant network are sequentially connected in series, or the stepped filter network and the LC resonant network are sequentially connected in series at intervals; the stepped filter network comprises a filter series trunk and a plurality of filter parallel branches, a first end of the filter series trunk is used as an input end, and two ends of the filter parallel branches are respectively connected to a ground wire and the series trunk; at least one series-connection mixed resonance unit is arranged on the filtering series-connection trunk and is used for forming a pole in a passband to expand the bandwidth of the passband; the filtering parallel branch is provided with at least one acoustic resonator or a parallel hybrid resonance unit. The wave filter can realize relatively high bandwidth, relatively high out-of-band rejection and relatively narrow transition zone.

The invention discloses a millimeter wave filtering antenna and an intelligent aided design method, the antenna adopts a differential aperture coupling feed mode to realize relatively wide impedance matching bandwidth and relatively high gain, low-frequency and high-frequency radiation zero points are respectively generated by adding a short circuit patch and slotting a radiation patch, and out-of-band gain suppression is realized. The out-of-band rejection level of a low-frequency band and the out-of-band rejection level of a high-frequency band are improved by adopting the planar inverted-F antenna and adding the parasitic Deep learning is adopted on a machine learning algorithm, a proxy model of selected antenna structure parameters and corresponding performance parameters is established, rapid prediction of antenna performance of a specific parameter structure is realized, a genetic algorithm is adopted to optimize the proxy model, an antenna structure corresponding to a target performance parameter is rapidly designed, and the method has the advantages of high efficiency, flexibility and expandability. The design efficiency and performance are improved, the design cost is reduced, and the antenna structure has the characteristics of low loss, high gain and high reliability.

The invention relates to a filter, a multiplexer, a radio frequency front-end module and electronic equipment. The filter comprises a substrate and a plurality of series resonators arranged on the substrate at intervals, the substrate comprises a signal input end, a signal output end and a grounding terminal, the signal input end is used for receiving external signals, the signal output end is used for outputting the external signals, and the series resonators are sequentially connected between the signal input end and the signal output end in series; wherein each series resonator comprises an interdigital transducer and reflecting gratings located on the two sides of the interdigital transducer, and the reflecting grating on at least one side of each interdigital transducer is electrically connected with the grounding terminal through a metal layer. According to the filter, the reflecting grating of the series resonator is grounded through the metal layer, so that the reflecting grating is in a zero potential state. Therefore, signal attenuation is reduced, and the out-of-band rejection capability and isolation of the filter are improved.

The utility model provides an auxiliary device for an L wave band test. According to the auxiliary device for the L wave band test, an installation shell is installed at the position, close to one side, of the top of a test board, an input head is installed on one side of the installation shell through an input line, a driving amplifier is installed at the other end of the input line, and the output end of the driving amplifier is connected with the input end of a final amplifier; and the output end of the final-stage amplifier is connected with the input end of the directional coupler. According to the auxiliary device for the L wave band test, better linearity and larger dynamic range are achieved through the design method, better harmonic wave, clutter suppression, gain flatness and intermodulation indexes can be obtained, the L wave band test frequency source generates two paths of signal output, the two paths of signals can be controlled through the upper computer, and the test accuracy is improved. The frequency consistency and the power consistency are good, good out-of-band rejection is achieved, and the accuracy of L-band test data is improved.

The invention discloses a tunable band elimination filter based on a quantum well structure photon time crystal and a method. The tunable band elimination filter comprises the quantum well structure photon time crystal; the quantum well structure photon time crystal comprises a first photon time crystal section, a time domain quantum well section and a second photon time crystal section which are connected in sequence; when an electromagnetic signal is propagated, the electromagnetic signal sequentially passes through the first photon time crystal section, the time domain quantum well section and the second photon time crystal section, so that a stable band gap region and a controllable resonance response are formed in a momentum space; a fitting relation between a local state equivalent wave vector and a time structure parameter is established by adjusting a time section proportion parameter and a refractive index contrast ratio in a quantum well structure photon time crystal, so that the local state quantity and momentum position of an electromagnetic signal are regulated and controlled; and frequency spectrum regulation of the electromagnetic signal is realized through a corresponding relation between the momentum space and the frequency domain space. The frequency spectrum regulation and control precision and the system stability are improved.

The invention discloses a broadband external suppression filtering antenna, which relates to the technical field of antennas and comprises a multimode resonant structure, and a metal layer I, a dielectric layer I, a metal layer II, a dielectric layer II, a dielectric layer III and a floor which are connected in sequence, a plurality of first metal through holes penetrating through the second dielectric layer are formed in the second dielectric layer, a plurality of second metal through holes penetrating through the third dielectric layer are formed in the third dielectric layer, the first metal through holes correspond to the second metal through holes in a one-to-one mode, and the first metal through holes are communicated with the corresponding second metal through holes to form longitudinal through holes. The second metal layer, the floor and all the longitudinal through holes jointly define an SIW cavity. The multi-mode resonance structure is arranged between the dielectric layer II and the dielectric layer III, the multi-mode resonance structure is arranged in the SIW cavity, and an excitation through hole penetrating through the multi-mode resonance structure is formed in the multi-mode resonance structure. The filter antenna has wider out-of-band rejection, and the miniaturization design of the filter antenna can be realized.

The present disclosure belongs to the technical field of wireless communications, and provides an antenna, an antenna system and an automobile. The antenna comprises a main antenna, a parasitic antenna and a main board, the main antenna and the parasitic antenna both being located on the surface of the main board, and the plane where the main antenna is located and the plane where the parasitic antenna is located being in parallel and opposite to each other. A feed point of the main antenna is connected to a feed transmission line of the main board, and the parasitic antenna is connected to a second ground end of the main board, the difference value between the resonance frequency point of the main antenna and the resonance frequency point of the parasitic antenna being lower than a target threshold value. The antenna is applied to an automobile and serves as a communication antenna, such as a 4G communication antenna or a 5G communication antenna, of the automobile so as to achieve 4G or 5G broad bandwidth coverage, such as full-bandwidth coverage. In addition, the antenna can also improve the degree of out-of-band rejection and the anti-pilot-frequency interference characteristic.

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.

The utility model discloses a high-density integrated filtering device and an electronic device. The filtering device comprises a first substrate, first to fifth capacitive units, first to third inductive units, first and second common ports, first and second potential ends, and first and second input and output ports. The first capacitive unit is arranged on a coupling path between the first common port and the first input and output port, the second capacitive unit is arranged on a coupling path between the first common port and the second common port, and the third inductive unit and the third capacitive unit are arranged on a coupling path between the first common port and the first potential end. The first inductive unit is coupled with the third capacitive unit; the fourth capacitive unit and the fifth capacitive unit are arranged on a coupling path between the second common port and the second potential end, the second inductive unit is coupled with the fifth capacitive unit, and the second common port is coupled with the second input and output port. According to the utility model, the out-of-band rejection performance of the device is improved, and the device has the advantages of miniaturization and high frequency selection characteristic.

The invention provides an integrated reconfigurable filtering honeycomb super-medium reflective array, which belongs to the field of antennae and comprises a multi-feed horn, a reflective array ground plane and a first transmission network arranged on the surface of one side of the reflective array ground plane in a matrix mode. Reconfigurable filters corresponding to the positions of the first transmission networks are arranged on the surface of the other side of the reflection ground plane, and each first transmission network comprises a honeycomb-shaped transmitting unit T and a honeycomb-shaped receiving unit R. The multi-feed-source horn transmits electromagnetic wave signals to the air. Each receiving unit R receives a signal and transmits the signal to the transmitting unit T through the corresponding reconfigurable filter, each transmitting unit T transmits wave beams outwards, the transmitting unit T can receive the wave beams transmitted by different receiving units R, and performance parameters are set and reflected frequency characteristics are adjusted by adjusting the reconfigurable filters; the invention further provides a honeycomb super-medium transmission array integrated with reconfigurable filtering. The invention also provides a transflective array. And the frequency selectivity and the out-of-band rejection capability of the antenna are improved.

The invention relates to the technical field of filters, and discloses a design method and system for an ultrahigh-precision filter inductor, and the method comprises the steps: designing a filter structure, and generating a filter parameter corresponding to the filter structure; constructing a test current of the initial filter, and analyzing an output current change value on an initial inductor in the initial filter by using the test current and the output current; calculating the power loss of the initial filter under the change values of the test current and the output current, calculating the return loss of the initial filter, calculating the quality factor of the initial inductor, and analyzing the out-of-band rejection of the initial filter; constructing a target function of the initial filter, screening a standard structure and a standard parameter from the filter structure and the filter parameter, and constructing a standard filter by using the standard structure and the standard parameter; and extracting a demand distribution characteristic from the user current demand, identifying a current distribution characteristic of the standard filter, and comparing the demand distribution characteristic with the current distribution characteristic. The filtering precision of the filter inductor can be improved.

The invention discloses a band-pass filter structure packaging method based on an RDL technology, and relates to the technical field of electronic engineering and semiconductor packaging. An RDL layer is constructed on the surface of a chip of a band-pass filter structure, a chip connecting device in a band-pass filter is connected with the chip, a local shielding layer is laid on the surface of the chip of the band-pass filter, a chip module and a band-pass filter function module are subjected to glue pouring packaging and connection, and a complete band-pass filter function module is constructed; and the band-pass filter function module is placed in the lower shell, the upper shell is buckled, secondary glue pouring packaging is carried out, and packaging of the band-pass filter structure is completed. The packaging efficiency and the yield of the band-pass filter are improved by adopting a staged glue filling and modular manufacturing mode. An asymmetric resonance unit layout is provided, an electromagnetic band gap (EBG) structure is formed in combination with a grounding through hole array, the high-frequency (more than 60 GHz) out-of-band rejection ratio is enhanced, and the use effect of the band-pass filter is improved.

The invention belongs to the technical field of microwave circuits, and particularly provides an L-shaped three-order small band-pass filter based on a quarter mode, so as to realize the performance characteristics of compactness and high out-of-band rejection of the band-pass filter. The invention comprises a port coupling structure, namely an input coaxial port and an output coaxial port; the cylindrical blind hole type tuning structures comprise a first cylindrical tuning structure, a second cylindrical tuning structure and a third cylindrical tuning structure; an arc-shaped windowing coupling structure; the through holes comprise a horizontal symmetrical double-window through hole and a vertical symmetrical double-window through hole; the L-shaped filter cavity structure is a cavity and is plated with a metal surface. According to the invention, a high dielectric constant medium and a selective metal plating process are adopted, so that a virtual magnetic wall is formed in a non-metal-plated region, quarter-mode resonance is realized, and a compact three-order band-pass filter is formed by combining a tuning structure and a windowing coupling design. Compared with a traditional full-mode band-pass filter, the full-mode band-pass filter has the advantages that the size and the weight can be reduced by 75%, and the full-mode band-pass filter is suitable for modern communication and millimeter wave related application.