98results about How to "With broadband" patented technology

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 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 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 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 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 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.