98results about How to "With broadband" patented technology

The invention relates to a terahertz dual-band metamaterial based on electric resonance. The metamaterial comprises a substrate and a metal layer unit, wherein the metal layer unit is provided with an electromagnetic resonance unit which comprises two split resonant rings and a closed ring; the closed ring is positioned between the two split resonant rings; and the metal layer unit is paved on the substrate in a periodic array manner. The terahertz double-band metamaterial is simple in structure and low in manufacturing cost, has the advantages of strong resonance, wide band and dual frequency points, can be effectively applied to terahertz function devices with various requirements on wide band design.

A method of using chaos laser to measure distance based on semiconductor laser includes modulating output character of semiconductor laser to make it emit chaos laser signal then splitting chaos laser signal to be reference light and detection light, using detection light to illuminate object to be measured carrying out correlative comparison of scattered back chaos detection light with chaos reference light, applying cross correlation manner to measure round - trip time of chaos detection light. The device for realizing said method is also disclosed.

The invention relates to a low-profile lens antenna capable of realizing wide-angle scanning. The lens antenna comprises a lens and a feed source positioned on the focal plane of the lens; beam scanning and tracking can be realized by mechanical control on the feed source; the lens has an electromagnetic wave focusing function, and the appearance of the lens can be flat-plate-shaped or curved-surface-shaped, and conformal design with a carrier platform can be realized; the effective dielectric constant distribution characteristic of the lens is that the effective dielectric constants are decreased from the center to the edges along the horizontal and longitudinal directions; the regulation and control on the effective dielectric constants can be realized by changing the structure or dimensions of the metamaterial units; and the assembling and preparation of the lens at a low cost is realized by multiple metamaterial panels in a stacked manner. The low-profile lens antenna has the characteristics of broadband, high gain, low profile, easy conformal property and the like, and is particularly suitable for high-gain conformal vehicle-mounted or missile-borne platforms in the fields of communication measurement and control, and the like.

The invention provides a transmission type polarized transition super surface, which belongs to the technical field of microwave frequency range electromagnetic wave regulation and control. The polarized super surface unit comprises three layers of metal pasters, with a medium substrate being disposed between two layers of metal pasters, and the top layer of metal paster and bottom layer of metalpaster having the same structure. Through reasonably designing the structure size of the top layer, the middle layer and the bottom layer of metal pasters, the incident linear polarization electromagnetic wave passes through the super surface structure and then continues to transmit. The transmitting electromagnetic wave has the equal electric field amplitude in the horizontal direction and the vertical direction, and the phase difference is 90 degree between the horizontal direction and the vertical direction, and thereby the transmitting electromagnetic wave has the feature of circular polarization. The invention is advantageous in that the transmission type circular polarization super surface has wide broadband, ultrathin surface, simple structure, and low cost; the polarized state of the electromagnetic wave can be flexibly controlled; wide application prospect is provided in fields like antennas, imaging, communication systems, electromagnetic confrontation and military stealth.

The invention relates to the field of microwave photon transmission, and discloses an implementation method and structure of a high-linearity microwave photonic link based on photonic neural network.The method comprises the following steps: processing a radio-frequency signal source through a strength modulation link, and inputting the processed radio-frequency signal source into N micro-loop filters, wherein N is an integer being larger than 1; performing neutral network training on the weight coefficients of the N micro-loop filters; and performing modulation and linear superposition on N electric signals output by the N micro-loop filters to construct the high-linear microwave photonic link. According to the method, a reverse link transmission function is built by the photonic neural network, and the high-linearity microwave photonic link is realized through a back compensation concept, so that the system structure is simplified remarkably. Through a BP training algorithm, a systemcan work under a non-cooperative environment, has broadband (such as THz), real-time and low-power processing capabilities, and is highly compatible with an existing microwave photonic link. The invention also discloses an implementation structure of the high-linearity microwave photonic link based on the photonic neural network.

The invention discloses a new concept broadband circularly polarized antenna. The new concept broadband circularly polarized antenna adopts the structure that a feed line is connected with an antenna radiation unit; the antenna radiation unit is etched on a dielectric baseplate; the dielectric baseplate is horizontally fixed above a reflecting plate through a supporting structure; the antenna radiation unit comprises two bending oscillators, two parasitic units, a coplanar microstrip line and a T-shaped microstrip line feed structure; the bending oscillators, the parasitic units and the coplanar microstrip line are etched on the reverse side of the dielectric baseplate; the T-shaped microstrip line feed structure is etched on the obverse side of the dielectric baseplate; the two bending oscillators are centrosymmetric about the dielectric baseplate; the coplanar microstrip line is arranged at a medial axis of the dielectric baseplate; the coplanar microstrip line comprises two wide-gap coplanar microstrip line bodies and two narrow-gap microstrip line bodies; the wide-gap coplanar microstrip line bodies feed the bending oscillators respectively to stimulate circularly polarized waves through the non-center-fed bending oscillators; besides, the broadband circularly polarized antenna adopts a novel and simple full-plane structure, and is convenient to process and form.

The invention discloses a preparation method for a microwave device with gradient refractive indexes based on a mixed liquid medium. The liquid medium is formed by mixing liquids with different dielectric constants; and the electromagnetic wave refractive index of the mixed liquid medium can be controlled by adjusting the mixing proportion of the different liquids. The frame structure of the microwave device is designed according to the requirements; rapid manufacturing of the frame structure of the microwave device is realized by using a rapid prototyping technology; the required microwave device can be obtained by filling the mixed liquid medium with different gradient refractive indexes into the designed frame structure; and the microwave device with controllable properties is obtained by replacing the liquid medium rapidly. The microwave device provided by the invention has the advantages of ultra wideband, low loss, controllable properties, easy preparation, low cost, etc.

The invention is concerned with a kind of multi-layer three-dimensional impending unilateralism and broad-band entelechy millimeter wave plane gap antenna, belonging to communication technology field, relating to circular metal gap inducting layer, microwave medium layer, entelechy gap radiation unit for coplanar wave-guide feeding, supporting layer and circular metal gap layer to cut off reflection of wave-guide. The circular metal gap inducting layer sets on a side of microwave medium layer, while entelechy gap radiation unit, circular metal gap layer and supporting layer are on the other side. The entelechy gap radiation unit for coplanar wave-guide feeding connects with microwave medium layer, and circular metal gap layer to cut off reflection of wave-guide connects with entelechy gap radiation unit for coplanar wave-guide feeding through the supporting layer. This invention is easy to adjust the size of coplanar wave-guide feeding to match with impedance and to prepare. It reaches the demand of entelechy and broad-band, unilateralism radiation and enhances plus of antenna remarkably.

The invention relates to a low-minor-lobe ridge substrate integrated waveguide slot array antenna. The low-minor-lobe ridge substrate integrated waveguide slot array antenna comprises a micro-strip line, a micro-strip line Balun, a first medium plate, a second medium plate, a ridge metal strip, metal through holes, ridge metal through holes, a short-circuit end and slots; a radiation body is formed by the first medium plate, the second medium plate, the ridge metal strip, the metal through holes, the ridge metal through holes, the short-circuit end and the slots; a feed network of the antenna is formed by the micro-strip line and the micro-strip line Balun. According to the antenna provided by the invention, the impedance bandwidth (VSWR is smaller than 2) is 8.92GHz to 9.63GHz and the relative bandwidth is 7.8 percent and is much higher than the relative bandwidth being about 4 percent of a substrate integrated waveguide slot array antenna; the gain of the antenna in the frequency band is about 10.3dB; a minor lobe electrical level in the frequency band is smaller than -25dB; influences of main wave beam external clutter signals are reduced and an anti-interference capability of a whole system can be effectively improved.

The invention provides a dual-polarized double-wide-surface antenna unit comprising a dielectric plate, four magnetic electric dipoles, a feed network and twelve copper columns, wherein the upper surface of the dielectric plate is a reflective ground; the four magnetic electric dipoles and the twelve copper columns are all disposed on the reflective ground of the dielectric plate; the upper and lower surfaces of the dielectric plate are covered with copper; the magnetic electric dipoles have the same structure; the upper portion of each magnetic electric dipole is in a quadrant shape; the lower portion of each magnetic electric dipole is supported by an L-shaped structure having an angle of 90 degrees; an annular hollowed-out structure is arranged on the center of the fan-shaped horizontal plane; the vertical plane is also a hollowed-out structure; the magnetic electric dipoles are separated by crossed slits; the crossed slits are configured to receive the feed structure for the feed network for supplying power to the magnetic electric dipoles; and the twelve copper columns are arranged in an annular shape and surround the four magnetic electric dipoles. The antenna has the characteristics of wide frequency band, double circular polarization, high cross polarization level and the like, and keeps the gain at a high stability level while achieving double wide coverage surfaces.

The invention discloses a dielectric resonator filter antenna. The antenna is fed from the bottom part through microstrip-coupled slots and simultaneously stimulates three modes to generate a wide radiation passband; and a wedge-shaped dielectric resonator antenna is stimulated by a pair of interval slots to improve the gain. An open circuit branch of a feed microstrip line can provide two radiation zero points close to the edge of the passband; parasitic microstrip lines are added to two sides of the feed microstrip line in parallel to improve the out-of-band rejection level of a high-frequency stop band; and the coupled slots are separated from the middle to improve the out-of-band rejection level of a low-frequency stop band. The dielectric resonator filter antenna has a quasi-elliptic function band-pass response, is simple in structure and does not utilize a complicated filter circuit. The designed 10dB impedance bandwidth can reach 23%; the band average gain is 9.05dBi; and the out-of-band rejection within a wide stopband range exceeds 25dB. Different bandwidth characteristics (13%-23%) can also be achieved through adjusting the antenna size.

The invention discloses a low-profile broadband microstrip antenna based on a differential feed technology. The low-profile broadband microstrip antenna comprises an upper dielectric plate, a lower dielectric plate and metal patches printed on the surfaces of the upper dielectric plate and the lower dielectric plate, wherein the upper dielectric plate and the lower dielectric plate are connected through four short-circuit grounding columns and two coaxial inner cores for feeding; the upper layer metal patch comprises a metal patch which is printed at the upper surface of the upper dielectric plate and is shaped like a Chinese character 'wang' and two concave-shaped metal patches which are printed on the upper surface of the upper dielectric plate, the lower surface of the upper dielectricplate is provided with two circular metal patches; and the metal patch on the lower dielectric plate is a metal floor. The two coaxial inner cores pass through an air gap between the lower dielectricplate and the two layers of dielectric plates, are respectively in contact with the two circular metal patches printed on the upper dielectric plate and are combined with the metal floor of the lowerdielectric plate to form two feed ports. The antenna adopts differential feed, has the advantages of a wide frequency band, a low section, a high gain, a simple structure and the like, and is suitablefor the wireless communication fields of base station communication, wireless local area networks and the like.

The invention discloses a vehicle-identification-oriented passive ultra-high-frequency (UHF) radio frequency identification (RFID) electronic tag structure. The RFID electronic tag structure comprises an UHF RFID chip, a remote UHF RFID tag antenna structure and a paper base material. The remote UHF RFID tag antenna structure is printed on a substrate, and the chip is welded on a feed port of the remote UHF RFID tag antenna structure through a gold wire ball bonding technology. Based on the automobile front windshield surface mounting background environment, the designed paper substrate passive UHF RFID structure has the advantages of broadband and remote recognition properties and capability to meet remote automatic recognition and management functions under the free stream operation environment of automobiles.

The invention relates to the technical field of wireless communication, in particular to a broad band circular polarization plane gap quaternary antenna array which comprises a circular polarization gap radiation array and a microwave medium layer, wherein the circular polarization gap radiation array is arranged on the microwave medium layer. The circular polarization gap radiation array comprises four circular polarization gap radiation units and a plurality of feeders, wherein, every two circular polarization gap radiation units are connected in parallel by the feeders into a radiation branch, and two radiation branches are connected in parallel by the feeders into a radiation trunk path, and the circle centers of the four circular polarization gap radiation units are on the same axis. The invention has the characteristics of miniaturization, complanation and broad frequency band, and solves the problem that a plane gap antenna cannot be realized easily; in addition, the structure of antenna units are arranged in a 1*4 linear array, thereby improving gain and frequency band.

A wireless energy double-frequency receiving device based on microwave transmission consists of a receiving antenna and a rectification circuit. The receiving antenna adopts a double-sided ground micro-strip line structure and is realized through a three-layer metal universal printed circuit board (PCB). The PCB is provided with five layers, wherein the first layer, the third layer and the fifth layer of the PCB are made of a copper material, the third layer is used as a ground wire, both the first layer and the second layer are used as the antenna and used for receiving electromagnetic waves of different frequency bands, and the radius and clearance of the two layers are different. The device can simultaneously receive the signal of a wave band s of 2.5 to 4GHz and a wave band c of 4 to 8GHz. Compared with other energy transmission systems, the wireless energy double-frequency receiving device has advantages of miniaturization, wide frequency band, high efficiency and the like.

The invention aims at disclosing a paper substrate radio frequency identification electronic label structure for vehicle identification. The structure comprises an ultra high radio frequency identification chip, and a remote ultra high frequency radio frequency identification (UHFRFID) label antenna structure and a paper substrate. The UHFRFID label antenna structure is printed on the substrate, and the chip is bound on a feed port of the UHFRFID label antenna structure in a welding mode through a welding technology. Based on an adhering background environment of a vehicle front windshield, a designed paper substrate passive ultra high frequency identification electronic label has the properties of a wide frequency band and remote identification, so that remote automatic identification and management functions of a vehicle under a free flowing operation environment are achieved.

The invention discloses a broadband series-feed sparse array antenna unit, which comprises an antenna feed part and an antenna radiation part, wherein the antenna feed part comprises an SMP structure, a strip line matching adjustment and phase adjustment part and metalized isolation columns around a strip line. The antenna radiation part comprises a dielectric layer of the antenna, a radiation patch of the antenna, a parasitic patch and a metallization isolation column. A radio frequency signal is fed into a strip line in the antenna feed layer structure through the SMP structure, the strip line is subjected to one-to-two power distribution, the amplitude is equal, the phase difference is 180 degrees, the radio frequency signal is coupled to an antenna patch in the antenna radiation layer structure through a linear gap in the upper layer ground of the strip line and an air cavity, and radiation of radio frequency energy is achieved. The average distance of the plurality of antenna units is greater than half wavelength of the antenna under the working frequency, and the layout of the antenna patch adopts a comprehensive algorithm of an antenna pattern, so that lobe deletion of the antenna can be prevented, the gain of the antenna can be improved, and the side lobes of the antenna can be reduced.

The invention discloses a four-leaf-clover-shaped broadband circular-polarized planar antenna, relates to the technical field of wireless communication and aims to provide a broadband circular-polarized planar antenna which is high in mechanical reliability, high in processing precision and low in cost. The four-leaf-clover-shaped broadband circular-polarized planar antenna comprises an upper medium substrate, a medium support plate and a lower medium substrate, wherein the medium support plate is glued between the upper medium substrate and the lower medium substrate. The four-leaf-clover-shaped broadband circular-polarized planar antenna further comprises a phase-shift power feeding network arranged on the lower surface of the lower medium substrate, a four-leaf-clover-shaped radiation paster including four metallic pasters, two coupling arms, a metallic floor positioned between the medium support plate and the lower medium substrate, and six short-circuited through holes, among which four are respectively and electrically communicated with the four metallic pasters and the metallic floor, and the other two are respectively and electrically communicated with the two coupling arms and two output ends of the phase-shift power feeding network.

The invention discloses a passive ultrahigh-frequency electronic-label structure used for an automobile. The structure includes a base material, a tag antenna structure and an ultrahigh-frequency radio frequency identification chip. The tag antenna structure is printed on the base material. The ultrahigh-frequency radio frequency identification chip is welded on a feed port of the tag antenna structure through a welding technology. The tag antenna structure includes a first substructure segment and a second substructure segment. The first substructure segment has a structure of Chinese character 'Shan' which is rotated anticlockwise for 90 degrees, that is, the middle of the first substructure segment is a bump and the two ends of the bump are connected with transition segments respectively. The transition segments are connected with extension segments vertical to the transition segments. The second substructure segment has a structure of Chinese character 'Shan' which is rotated clockwise for 90 degrees. The second substructure segment is symmetrical with the first substructure segment. The passive ultrahigh-frequency electronic-label structure used for the automobile has the characteristics of broadband and long-distance identification and capable of satisfying vehicle-operating long-distance automatic identification.

The invention relates to a laminated differential broadband base station antenna, which comprises an antenna main body, a reflecting plate and a coaxial line, wherein the antenna main body is arrangedabove the reflecting plate through the coaxial line, the antenna main body comprises a radiation unit, a cross-shaped feed structure, a parasitic unit, a first dielectric substrate and a second dielectric substrate, the radiation unit and the cross-shaped feed structure are installed on the lower surface and the upper surface of the first dielectric substrate respectively, the parasitic unit is installed on the lower surface of the second dielectric substrate, the second dielectric substrate is placed above the first dielectric substrate, the radiation unit is composed of four linear radiation arms, and the tail end of each radiation arm of the radiation unit is loaded with an L-shaped branch knot. The structure provided by the invention meets the electrical performance of the antenna, and has excellent radiation performance; and compared with a traditional single-port antenna, the antenna of the invention has the advantages that the anti-interference capability of the antenna is improved by adopting dual-port feeding, and the antenna is made of a PCB and has the advantages of low cost, simplicity in processing and the like.

The invention belongs to the field of wireless communication, and particularly relates to a small broadband differential excitation dual-mode and dual-polarized base station antenna in this field. Theantenna comprises a first dielectric plate, a second dielectric plate a third dielectric plate, a reflection plate, a coaxial connector, a radiation patch, a driving branch and baluns. The first dielectric plate is horizontally arranged at the uppermost layer of the whole antenna; the reflection plate is horizontally arranged at the lowest layer of the whole antenna; the pair of mutually orthogonal baluns are arranged between the first dielectric plate and the second dielectric plate, and the first dielectric plate and the reflection plates are respectively perpendicular to the baluns up anddown; the orthogonal surfaces of the orthogonal baluns are respectively printed with the second dielectric plate and the third dielectric plate to allow the second dielectric plate and the third dielectric plate to be mutually perpendicular to the first dielectric plate and the reflection plate. The small broadband differential excitation dual-mode and dual-polarized base station antenna ensuresthe miniaturization while ensuring the broadband.

The invention relates to a dolphin bionic active pulse signal modeling method. The method comprises the following steps: 1, selecting pulse seed signals, i.e., according to a task target, selecting one or more pulses from single frequency, linear frequency modulation, hyperbolic linear frequency modulation and Rayleigh pulses as component seed signals; 2, determining a component quantity and frequency spectrum distribution of bionic signals, wherein there can be components in any quantities, two to three components are taken for the sake of simplicity, in terms of energy distribution of spectra, whether target detection focuses on a low-frequency portion or a high-frequency portion is mainly considered, and proper weights are given; 3, performing linear superposition after each component is delayed and weighed; and 4, enveloping a superposition result through a Gaussian mode. According to the invention, output spectrum distribution of synthetic signals can be obtained through adjusting weight coefficients and time delays, a certain adaptive mechanism is employed so that optimal detection waveforms can be obtained, and the defect of variation of detection performance due to restrictions of environment and targets under a conventional fixed detection mode can be effectively improved.

The invention discloses a broadband high-linearity low-noise driving amplifier of a 5G base station. The driving amplifier comprises an input matching network, a power protection network, a driving Darlington amplification network, a driving base bias network, an inter-stage matching bias network, a final-stage power amplification network, a final-stage base bias network and an output matching bias network. The broadband, high-linearity and low-noise driving amplifier structure capable of being applied to the 5G base station is realized by utilizing a multistage amplification network technology. According to the invention, a Darlington tube is used as a driving amplification network, the driving bandwidth of the amplifier is remarkably improved, the noise coefficient is reduced, and the power protection network is adopted, so that the driving amplifier has the good anti-burning characteristic, and the whole amplifier has the advantages of being high in linearity, high in gain, low in noise and the like in combination with the last-stage high-linearity power amplification network.

The invention discloses a circularly polarized angle diversity antenna which comprises an upper medium plate, a lower medium plate, a first folding metal line, a second folding metal line, metal columns and a metal plate ground, wherein the first folding metal line is printed on the upper surface of the upper medium plate and the lower surface of the lower medium plate; the part of the first folding metal line on the upper medium plate and the part of the first folding metal line on the lower medium plate are connected through four metal columns; the first folding metal line feeds power through the metal columns in the center; the second folding metal line is printed on the lower medium plate; the second folding metal line comprises a serial feed network, a first L-shaped monopole, a second L-shaped monopole, a third L-shaped monopole and a fourth L-shaped monopole; a horizontal omnidirectional circularly polarized radiation direction graph is provided through the first folding metal line; a zenithal circularly polarized radiation direction graph is provided through the second folding metal line; with the combination of the two radiation direction graphs, circularly polarized coverage of an upper semispherical surface can be provided through the antenna. The antenna has the advantages of small size, low profile, wide band and easiness in manufacturing, and is applicable to design of vehicle-mounted satellite communication.

The invention discloses a broadband waveguide slotted-type low-axis ratio circularly-polarized antenna for high power microwave measurement, which comprises an open-ended waveguide provided with a mounting flange. The open-ended waveguide comprises a waveguide body; the inner part of the waveguide body is divided to two sections of stepped cavities by an interface; the two sections of cavities arerespectively a linearly-polarized signal transmission section and a circularly-polarized signal forming section; two opposite surfaces of the waveguide body are provided with notch grooves; the two notch grooves are centrally symmetrical with the central axis of the open-ended waveguide transmission direction to provide to generate two orthogonal linear polarization and 90-degree phase delay needed by the circularly-polarized signals; and the bottom part of the notch groove is flush with the interface. The problem of low measurement accuracy of a high power microwave radiation field caused bydefects that the conventional linearly-polarized receiving antenna is likely to polarization mismatch and the circularly-polarized receiving antenna is large in axis, narrow in bandwidth and low in power capacity can be mainly solved.

The invention provides a satellite-borne S-band measurement and control antenna, which comprises a choking coil, a protection cover, four-arm spiral band and a phase shifter, and is characterized in that the choking coil is integrally machined, and the overall dimensions and the number of turns of the choking coil can be adaptively changed according to different electrical indicator requirements; the protection cover is molded by a composite material and is effectively adhered to the choking coil so as to form a compact structure; the four-arm spiral band is of a pure metal structure and divided into an inner cylinder and an outer cylinder; phase shifter does not contain a component inside and realizes phase shifting through a metal strip line; and the four-arm spiral band and the phase shifter are designed into a modular assembly and assembled according to different antenna turning direction requirements. Therefore, the antenna provided by the invention has the characteristics of miniaturization, hemispherical beam, wide-angle circular polarization, broadband and the like, the phase shifter of the antenna does not contain components, and the phase shifter and the four-arm spiral band realize radio frequency connection through structural plugging, so that the satellite-borne S-band measurement and control antenna realizes compact structure, miniaturization, light weight and high reliability.

The invention discloses a back-cavity antenna for X-band probe feeding in relation to a cavity antenna and provides a back-cavity antenna for X-band probe testing featuring one direction radiation, wide frequency band, stable gain and stable phase center. The antenna of the invention comprises a metal grounding plate, a back cavity, a feeding coaxial line and a feeding probe. The back cavity is arranged at one side of the metal grounding plate; the metal grounding plate is provided with a slot; the back cavity and the slot are used for an electromagnetic field to realize externally one direction radiation through the slot; the feeding coaxial line feeds towards the slot through the feeding probe. The antenna of the invention is simple in structure and small in size. The antenna also has a wide frequency band and stable gain and can be used as a single antenna or combined with lenses for use. The antenna of the invention can be widely applied in the following fields of space research, broadcasting satellites, fixed communication business satellites, global detection satellites and meteorological satellites.

The invention discloses a rotary transformer which is used for achieving transmission of broadband signals. The rotary transformer comprises a stator and a rotor, the rotor and the stator are not in physical contact, magnetic cores of the same structure are adopted for the rotor and the stator, each magnetic core comprises a first magnetizer, a second magnetizer and a third magnetizer, the first magnetizers, the second magnetizers and the third magnetizers form magnetic circuits of the magnetic cores, and the areas of all magnetic flux surfaces on the magnetic circuits are the same. According to the rotary transformer, by optimizing the structures of the magnetic cores, the areas of all cross sections on the magnetic circuits of the magnetic cores are the same or approximately the same so as to lower magnetic resistance, so that the loss in high-frequency signal transmission is lowered, and broadband signals wider in frequency range can be transmitted under the situation that it is guaranteed that signals are distortionless.

The invention discloses a titanium-silicon-carbon composite wave-absorbing agent, which is composed of Ti3SiC2-based shell and Ni0.5Zn0.5Fe2O4 ferrite magnetic nano coating, wherein the mass ratio ofNi0.5Zn0.5Fe2O4 ferrite to Ti3SiC2 is 1:(3-6). The electromagnetic characteristic of Ti3SiC2 is adjusted by a Ti3SiC2 composite wave-absorbing agent and Ni0.5Zn0.5Fe2O4 ferrite coating layer, the impedance match performance of the composite wave-absorbing agent is improved, when the electromagnetic wave effect is used on the Ni0.5Zn0.5Fe2O4 ferrite coating layer, dielectric loss and magnetic lossare generated, and the wave-absorbing performance of the composite absorbent can be enhanced. The preparation method has the advantages of easy control of process condition, simple operation, and lowpreparation cost; the wave-absorbing material has the characteristics of wide band, low density, and strong wave absorbing, the surface density of the composite absorbing material is in 1.5 kg / m<2., the absorption band is wide, and the reflectivity test result shows that the band is better than -10 dB(90% of absorption) bandwidth by 9.0 GHz.

The invention relates to a terahertz miniaturized subharmonic mixer adopting symmetrical folded open circuit branches. The terahertz miniaturized subharmonic mixer comprises a microstrip circuit composed of a radio frequency circuit, a local oscillator intermediate frequency duplex circuit, an intermediate frequency output circuit and a diode pair. The radio frequency circuit and the local oscillator intermediate frequency duplex circuit are respectively arranged at two ends of the diode pair; the local oscillator intermediate frequency duplex circuit is internally provided with a band elimination filter with a symmetrical folding open circuit branch structure, and the band elimination filter with the symmetrical folding open circuit branch structure is used for blocking a signal with a corresponding frequency and allowing a signal with another frequency to be transmitted at the same time; and the intermediate-frequency output circuit is arranged at the other end of the local oscillator intermediate-frequency duplex circuit and is used for outputting the intermediate-frequency signal to an external device. The band elimination filter adopting the symmetrically folded open-circuit branch structure has the advantages of simple structure, small size, easiness in tuning and the like. The terahertz mixer realized based on the band elimination filter has the excellent performances of wide band, low frequency conversion loss, high return loss and the like.