182 results about "Band rejection" patented technology

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 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 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 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 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 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 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.

The invention belongs to the technical field of integrated circuit manufacturing and filters, and discloses a surface-mounted double-layer stacked microstrip band-pass filter. The filter comprises an upper metal layer, an upper substrate, a middle metal layer, a lower substrate and a lower metal layer which are sequentially arranged from top to bottom. A double-layer stacking method is adopted, the multi-order resonators are placed on the lower layer substrate, the upper layer metal layer, the side wall metalized through holes and the lower layer metal layer form a metal cavity structure, and the size of the filter is remarkably reduced; the multi-order resonator adopts a stepped impedance resonator structure, so that a low-frequency end zero point generated by high-order mode coupling can be effectively used, and better out-of-band rejection can be obtained; a ceramic substrate or a glass substrate with a relatively large dielectric constant is selected, so that the high-frequency loss of a passive device is remarkably reduced, and the quality factor is improved.

The invention belongs to the technical field of filters, and particularly relates to a reconfigurable electric tuning frequency hopping filter and a multi-target optimization control method thereof.The filter comprises an MCU module, a resonance circuit module, a pre-distortion module and a signal receiving and transmitting module, the MCU module is provided with two main control CPUs and used for radio frequency signal processing, parameter control and communication coordination, address codes are calculated through the main control CPUs, and the signal receiving and transmitting module is used for receiving and transmitting signals. Radio frequency signal processing is set to be straight-through processing or filtering processing, a C-V curve and tuning voltage-frequency response of a variable capacitance diode are measured, a nonlinear model is established, and the non-linear model is used for radio frequency signal preprocessing of the MCU module, sending the radio frequency signal to the pre-distortion module or outputting the radio frequency signal after straight-through processing through parameter control of the MCU module. According to the invention, non-linear compensation can be carried out on signals with different frequencies in advance, and then the signals are distributed to corresponding resonance circuits through a digital chip in an address code calculation mode, so that the out-of-band rejection performance is improved, and distortion is reduced.

The invention discloses a dual-polarization band-pass three-dimensional frequency selective surface which comprises a plurality of unit structures arranged in a matrix on a two-dimensional plane. Each unit structure comprises a square metal column, a first square medium cylinder attached to the peripheral surface of the square metal column, and a second square medium cylinder attached to the peripheral surface of the first square medium cylinder; a first groove and a second groove which are crossed are symmetrically formed in the upper surface and the lower surface of the square metal column; the first square medium cylinder comprises four first side walls, the surface, far away from the square metal column, of each first side wall is a layer of metal patch, and the center of each first side wall is embedded into a first metal cylinder; the second square medium cylinder comprises four second side walls, and a second metal cylinder is embedded into the center of each second side wall; and the adjacent unit structures are interconnected through two adjacent and parallel second side walls in the respective second square medium cylinders. The antenna has the characteristics of dual polarization, flat third-order passband, relatively wide out-of-band rejection and good angle stability.

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 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 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 invention provides a filtering unit, a filter chip and a radio frequency transceiving system. The filtering unit comprises a main filter and a lumped element filtering circuit connected with the main filter, the main filter comprises a plurality of parallel microstrip line resonance units which are arranged at intervals, and the two outermost microstrip line resonance units are respectively provided with a feed input end and a feed output end; the number of the lumped element filter circuits is two, and the two lumped element filter circuits are symmetrically arranged on the two sides of the main filter and connected with the feed input end and the feed output end respectively. And each lumped element filter circuit comprises a low-frequency resonance circuit and a low-pass matching network which are formed by connecting lumped parameter devices. The lumped element filter circuit is additionally arranged on the basis of the main filter, resonance frequency points can be increased at a low-frequency position through the lumped element filter circuit, high-frequency out-of-band rejection of the whole filter is enhanced, and the gain flatness of the filter can be conveniently improved by adjusting parameter values of lumped parameter devices in the lumped element filter circuit.

The invention relates to the technical field of radio frequency filters, and discloses an electromagnetic hybrid coupling filter. The filter is formed by stacking at least two spiral wiring resonators perpendicular to a winding plane, and comprises two input and output ports which are respectively connected with the first resonator and the last resonator. Each spiral wiring resonator is composed of at least two layers of metal spiral wiring, and the multiple layers of metal spiral wiring are sequentially connected through plated-through holes. The spiral wiring resonator is arranged in the insulating medium, and the resonant frequency of the spiral wiring resonator is determined by the length of the metal wiring and the dielectric constant of the dielectric material. Electric coupling and magnetic coupling exist between every two adjacent spiral wiring resonators at the same time, a transmission zero point can be generated outside a passband while a coupling signal forms the transmission passband, and the out-of-band rejection capacity is improved. The spiral wiring filter is compact and flexible in structure, can be realized by adopting various metal wiring processes, and can be independently made into a filter chip or directly wound in a circuit substrate of a radio frequency system to realize a filtering function.

This application provides a radio frequency (RF) front-end module and an electronic device. The RF front-end module includes a substrate, a shielding structure, RF components, and multiple grounding branches. The substrate includes a metal layer. The shielding structure includes a shielding layer disposed on top of the substrate and shielding sidewalls, with the shielding sidewalls extending from the shielding layer toward the substrate. At least one RF component is disposed within the projection of the shielding structure onto the substrate. The grounding branches connect the metal layer and the shielding sidewalls, and are grounded through metal vias, with a gap between adjacent grounding branches. By grounding the shielding structure through the grounding branches disposed on the side of the substrate, the electromagnetic shielding effect of the shielding structure can be enhanced. Furthermore, interference signals generated inside the shielding structure can be efficiently transmitted to ground, preventing these interference signals from resonating inside the shielding structure and affecting the overall performance of the RF front-end module, thereby improving the out-of-band rejection performance of the RF front-end module.

A radio frequency front-end circuit includes a first diplexer, an extractor, and a second diplexer. First diplexer is coupled to an antenna for receiving a radio frequency signal and configured to separate radio frequency signal into a first signal within low, mid and high bands of a wireless wide area network and a second signal within an ultra-high band of WWAN. Extractor is coupled to first diplexer. Extractor includes two band pass filters and a band rejection filter. Two band pass filters are configured to extract two global navigation system signals within two global navigation system bands from first signal. Band rejection filter is configured to allow a third signal within the mid and high bands of WWAN in first signal to pass. Second diplexer is coupled to first diplexer and extractor and configured to combine second and third signals into a WWAN signal.

The invention relates to the technical field of remote sensing data processing, and discloses a multi-source remote sensing data-based territorial space planning conflict detection method and system, and the method comprises the following steps: S101, determining the length of a local analysis window; step S102, calculating a semantic contrary degree; step S103, calculating a normal comprehensive displacement; step S104, calculating a normal offset area gain; step S105, executing difference set elimination; and S106, generating an evidence heat map. According to the method, a local geometric field is constructed to clarify an analysis reference and a scale, a semantic contrary degree is calculated by combining a multi-source remote sensing data semantic segmentation result, and a conflict area error and a geometric strip are deducted by analyzing an integral to eliminate a false conflict region; therefore, false conflict interference caused by registration errors is reduced, and the output robust conflict mask and the correction conflict area are more suitable for the actual planning conflict condition.

The utility model discloses a kind of low-noise amplifier structures with high out-of-band suppression characteristics, it is related to radio frequency device technical field, wherein, low-noise amplifier includes electrically conductive and magnetically conductive shell, the top of electrically conductive and magnetically conductive shell is shaped with emission space, bottom is shaped with filter space, left side or right side is shaped with power supply space, emission space is equipped with emission module, filter space is equipped with filter module, power supply space is equipped with power supply module, power supply module, filter module and emission module are sequentially electrically connected.The technical scheme provided by the utility model can provide a kind of small volume and can prevent frequency signal leakage, with high reliability low-noise amplifier.

The application discloses a band-pass filter with multiple zero points and high out-of-band suppression based on an IPD technology. Mainly includes main circuit, input and output port; the main circuit includes first parallel capacitor, first series capacitor, first parallel inductor, second parallel capacitor, second parallel inductor, second parallel capacitor, second series capacitor, third parallel capacitor, first series inductor, third series capacitor, fourth parallel capacitor, fourth series inductor, fourth series capacitor. The application adds four zero points to suppress high frequency and low frequency, realizes higher out-of-band suppression, and improves the filtering characteristic of the band-pass filter; and higher out-of-band suppression is realized by adopting an optimized circuit structure.

The application discloses a kind of space non-resonant node resonator, filter and radio frequency communication equipment, and the resonator is loaded by periodic capacitance type or inductive type device to form capacitance type space non-resonant node unit or inductive type space non-resonant node unit;Capacitance or inductive type space non-resonant node unit is arranged and combined by the same kind or two kinds of space non-resonant node unit mixed to form space filter.The application has the characteristics of controllable transmission zero, low profile and high out-of-band rejection, wide application occasions, wide coverage;Moreover, the structure of the space filter of the application is simple, in addition to not occupying the volume of antenna, PCB processing technology can also be used to make the design cost low.

The invention discloses a radio frequency front-end module and electronic equipment, the radio frequency front-end module comprises a power amplifier, a filter and a matching element, the signal input end of the filter is connected to the power amplifier, and the signal output end of the filter is connected to the matching element. The signal input end of the filter is close to the first side edge of the filter, the signal output end of the filter is close to the second side edge of the filter, and the first side edge and the second side edge of the filter extend in the first direction. The first connecting end of the matching element is close to the first side of the matching element, the second connecting end of the matching element is close to the second side of the matching element, the first side and the second side of the matching element extend in the second direction, and the second direction intersects with the first direction. According to the invention, the position relation between the matching element and the filter is optimized, so that the matching element can reduce the influence degree on the filter under the condition of realizing impedance matching on the dominant frequency signal, thereby improving the out-of-band rejection effect of the filter, and ensuring the transmission quality of the radio frequency signal.

The application provides an adaptive filtering method, system and storage medium for a GPS circuit, real-time scanning of a radio frequency signal of a GPS through wide-band radio frequency sampling, and obtaining an interference energy distribution spectrum based on an energy peak value detection algorithm; determining interference energy based on a preset frequency point, so as to match a preset interference library; if the matching is a known interference frequency point, activating a preset fixed band rejection unit, if the matching is an unknown interference frequency point, dynamically calculating LC parameters, configuring a programmable resonance unit, and realizing dynamic suppression of an interference signal; verifying a signal-to-noise ratio based on a preset period, calculating an optimization index, and if the optimization index is insufficient, triggering LC parameter iteration and updating until positioning is stable; and providing core technical support for a high-precision positioning scene.

The present invention discloses a miniaturized multi-transmission zero balanced dual-band bandpass filter based on notch, specifically including: a differential structure parallel two-wire input port A, a differential structure parallel two-wire output port B, a dielectric substrate, two sections of annular double-sided differential signal transmission lines, two sections of straight double-sided differential signal transmission lines, two groups of inverting connection structures, two groups of double-sided hairpin-type coupled lines, two sections of double-sided terminated open stubs, two sections of double-sided high-impedance transmission lines, one section of double-sided low-impedance transmission line, one group of double-sided grounding structures, and one group of double-sided terminated short-circuit parallel coupled lines. The present invention realizes the high-performance dual-band broadband bandpass filtering characteristics of multi-transmission zeros and high out-of-band rejection for differential-mode signals, and introduces notch characteristics into the balanced filter structure, thereby suppressing the interference signals between the high- and low-pass frequency bands. Therefore, it is very suitable for application in various balanced microwave systems to improve the overall performance of the system.