373 results about "Perpendicular polarization" patented technology

The invention discloses an ultra-wideband low-profile dual-polarization curved surface phased-array antenna, and belongs to the field of antenna engineering technology and wireless communication. The phased-array antenna comprises a plurality of pitching surface sub-arrays which are arranged along the axial direction; the pitching surface subarray is composed of a plurality of curved surface antenna units which are uniformly distributed along the circumference, and the whole pitching surface subarray is fan-shaped; the curved antenna unit comprises a curved dielectric block, a metasurface matching layer, a radiator layer, a vertical feed balun, a wave-absorbing resistance layer and a metal floor layer, wherein the metasurface matching layer and the radiator layer are conformally arranged on the upper surface and the lower surface of the curved dielectric block. According to the antenna, the flexible dielectric plate is used as a carrier of a radiation dipole and is matched with the PCB metal floor, so that the normal active standing-wave ratio of the antenna is smaller than 3.0 in ten octaves in two linear polarization directions of horizontal polarization and vertical polarization, and + / -60-degree scanning is realized in an azimuth plane.

The embodiment of the invention provides a ka and k waveband dual-frequency dual-polarization broadband wide-angle scanning common-aperture antenna unit and an antenna array, and relates to the technical field of common-aperture antenna arrays, the antenna unit comprises an antenna unit substrate, a low-frequency antenna, a high-frequency antenna and a wide-angle matching layer; the low-frequency antenna and the high-frequency antenna are arranged in the antenna unit substrate, and the high-frequency antenna comprises a shielding enclosure frame which is located between the low-frequency antenna and the high-frequency horizontal polarization L-shaped feed probe and between the low-frequency antenna and the high-frequency vertical polarization L-shaped feed probe; the wide-angle matching layer is arranged on the front surface of the antenna unit substrate and is positioned above the low-frequency antenna and the high-frequency antenna; wherein the low-frequency antenna is an L-shaped probe coupling microstrip patch antenna with a shielding enclosure frame, and the high-frequency antenna is a slot antenna. The antenna is simple in structure, employs a printed board technology, is very low in processing difficulty, is lower in cost, and is easy to be interconnected with rear-end equipment.

The invention provides a low-scattering carrier for an airfoil front edge RCS test, the low-scattering carrier comprises a front edge cover plate and a carrier main body which are detachably connected, the carrier main body and a carrier end face are of an integrally formed metal hollow structure, the front edge of the carrier main body is of a linear structure attached to an airfoil front edge wave-absorbing structure, and the front edge of the carrier main body is of a rectangular structure attached to the airfoil front edge wave-absorbing structure. The rear edge of the carrier body is of a linear structure parallel to the front edge. According to the low-scattering carrier, the drop-shaped design is adopted, the carrier end face and the carrier body are integrally formed, and the airfoil front edge and rear edge parallel structure is used, so that the influence of the edge on angular domain scattering assessment is reduced, and the vertical polarization and horizontal polarization electromagnetic scattering characteristics of the carrier are greatly reduced; and the stealth performance of the carrier in various radar environments is further improved. The low-scattering carrier provided by the invention has a good traveling wave suppression effect, and in an X wave band 0-50 degrees range, the RCS mean value of polarization in the horizontal direction can reach-45dBsm, and the RCS mean value of polarization in the vertical direction can reach-40dBsm.

The invention provides a tri-polarization meter-wave antenna unit which is composed of five dielectric layers and six metal layers. Wherein the six metal layers comprise a top-layer square parasitic patch surrounded by a metal decoupling square ring, a middle square radiation patch, a bottom-layer circular patch loaded by an annular metal short circuit column, a ground plane 1, a feed strip line and a ground plane 2 in sequence from top to bottom. Wherein the lower layer is a circular patch antenna loaded with an annular metal column, and provides a monopole-like vertical polarization horizontal omnidirectional radiation pattern. In the structural design of the upper-layer horizontal polarization radiator, in order to realize the characteristic of horizontal polarization, an edge-fed square microstrip patch antenna structure is adopted, and the antenna is simple in structure, easy to realize and capable of generating two polarized orthogonal directional diagrams in the zenith direction. Meanwhile, a capacitive parasitic patch and a dielectric layer are loaded above the square microstrip patch antenna, so that the Q value can be further reduced, and double resonance points are introduced, so that the bandwidth of the antenna is further expanded.

The invention provides a common-caliber dual-polarization indoor distribution antenna and communication equipment, the common-caliber dual-polarization indoor distribution antenna comprises a vertical polarization antenna, a horizontal polarization antenna and a feed structure, the vertical polarization antenna comprises a metal floor, a triangular metal plate, a plurality of grounding metal columns and a first copper-clad layer, the triangular metal plate and the plurality of grounding metal columns are arranged between the metal floor and the first copper-clad layer; the horizontally polarized antenna comprises a double-layer dielectric plate and a slot array, the bottom of the double-layer dielectric plate is coated with copper to form a first copper-coated layer, and the slot array is arranged at the top of the double-layer dielectric plate; the horizontally-polarized antenna and the vertically-polarized antenna are arranged in a common-caliber mode, the structure is simple, and the size is small. The feed structure comprises a first feed structure and a second feed structure, the first feed structure is connected with the vertical polarized antenna, and the second feed structure is connected with the horizontal polarized antenna; the first feed structure and the second feed structure are arranged on the metal floor in a non-overlapping manner, so that coupling interference is avoided.

The invention relates to the technical field of photovoltaics, and provides a photoelectric conversion layer, a preparation method thereof, a photovoltaic device and application. The photoelectric conversion layer comprises at least one Janus MXY two-dimensional material layer, M comprises Mo or W, X comprises S, Se or Te, Y comprises S, Se or Te, and elements of X and Y are different. According to the invention, the vertical polarization characteristic of the Janus MXY two-dimensional material layer is utilized, and an extremely strong spontaneous light current phenomenon is shown, so that the photovoltaic device has ultrahigh light responsiveness and ultrafast light response speed.

The utility model provides a reflection type polarization rotator which comprises a reflection bottom plate, a dielectric layer and a metal patch, the reflection bottom plate is used for reflecting electromagnetic waves, the dielectric layer is arranged on the upper surface of the reflection bottom plate, the metal patch is arranged on the upper surface of the dielectric layer, and the horizontal section of the metal patch is of a structure shaped like a Chinese character'wang '. And the center line of the structure shaped like the Chinese character'wang 'is inclined to the horizontal polarization direction and the vertical polarization direction. The reflection type polarization rotator provided by the utility model has wider working bandwidth and higher polarization conversion efficiency, and is simple in structure and more convenient to process and apply.

The invention discloses a synthetic aperture radar sea surface wind field inversion method considering Doppler centroid anomaly, and the method comprises the following steps: obtaining vertical polarization SAR image data, and extracting a radar backscattering coefficient NRCS and an original Doppler centroid anomaly DCA related image; based on Doppler frequency data of the VV polarized SAR image, through quintic polynomial fitting and land area correction processing, DCA information caused by geophysical factors is extracted; acquiring actually measured wind speed data of the buoy, matching the actually measured wind speed data with an external background wind field, and performing nonlinear fitting correction by adopting an exponential function to obtain a corrected background wind field speed; constructing a variational analysis model containing an NRCS and DCA observation field, taking the corrected external wind field as a background field, and obtaining a wind speed field and a wind direction field through minimum cost function inversion; performing verification analysis on an inversion result by adopting buoy observation data subjected to space-time matching; the precision and reliability of the vector parameters of the sea surface wind field can be improved.

The invention discloses an unmanned aerial vehicle detection direction-finding device capable of full-band detection, and relates to the field of unmanned aerial vehicle detection direction-finding equipment, the unmanned aerial vehicle detection direction-finding device comprises a direction-finding shell, the direction-finding shell is provided with a plurality of direction-finding antenna units along the circumferential direction of the direction-finding shell, each direction-finding antenna unit comprises a rotating unit, a telescopic unit and a direction-finding antenna, and the rotating unit comprises a rotating cylinder. The telescopic unit comprises a deflection cylinder and a multi-stage telescopic cylinder, one end of the deflection cylinder is rotationally connected with the rotating cylinder, one end of the multi-stage telescopic cylinder is slidably connected with the deflection cylinder, the other end of the multi-stage telescopic cylinder is connected with the direction-finding antenna, and the deflection cylinder adjusts the state of the direction-finding antenna and is used for forming a vertical polarization direction-finding state or a horizontal polarization direction-finding state. The rotating axis of the rotating cylinder is perpendicular to the rotating axis of the deflection cylinder, the rotating cylinder is used for adjusting the direction finding angle of the direction finding antenna, four monitoring technologies of low frequency band, high frequency band, vertical polarization and horizontal polarization are achieved through one antenna, and the direction finding antenna can be applied to more complex environments.

For example, an apparatus may include a baseband controller configured to control a plurality of dual-polarization Radio Heads (RHs) to communicate a Multiple-Input-Multiple-Output (MIMO) transmission, the baseband controller configured to control a first dual-polarization RH of the plurality of dual-polarization RHs to communicate a first spatial stream of the MIMO transmission with a horizontal-polarization via one or more first dual-polarization antenna elements of the first dual-polarization RH, and to control a second dual-polarization RH of the plurality of dual-polarization RHs to communicate a second spatial stream of the MIMO transmission with a vertical-polarization via one or more second dual-polarization antenna elements of the second dual-polarization RH.

The polarization-insensitive dynamic adjustable metasurface invisible cloak is suitable for different target terrain backgrounds, independent adjustment of polarization-insensitive amplitude and phase is achieved through innovative design, and the polarization-insensitive dynamic adjustable metasurface invisible cloak is suitable for dynamic invisibility and electromagnetic wave control in a complex environment. The cloak is composed of a plurality of metasurface units arranged in an array mode, each unit comprises a multi-layer metal structure and a dielectric substrate and is integrated with an active adjustable device, and real-time regulation and control over the phase and amplitude of electromagnetic waves are achieved. And by adopting the 90-degree rotational symmetry design, the good adaptability to horizontal polarization and vertical polarization radar waves is ensured. By adjusting the bias voltage, the device can simulate microwave reflection characteristics of different target terrains, and an efficient solution is provided for military stealth, terrain detection and electromagnetic environment simulation. Compared with the prior art, the electromagnetic wave control flexibility and environmental adaptability of the metasurface are remarkably improved.

The invention provides a structure multiplexing ultra-wideband dual-polarization low-profile high-efficiency one-dimensional phased-array antenna, and belongs to the technical field of antenna engineering. The antenna is formed by one-dimensional periodic arrangement of a plurality of antenna units. The antenna unit comprises a bottom structure, and two horizontal polarized antennas and a vertical polarized antenna which are vertically arranged above the bottom structure; wherein the bottom structure is used for feeding the horizontal polarized antenna and the vertical polarized antenna; the horizontally-polarized antennas are arranged on the two sides of the vertically-polarized antenna in a mirror symmetry mode, the horizontally-polarized antennas and the vertically-polarized antenna are arranged in an orthogonal mode, and the horizontally-polarized antennas are achieved through slot radiators to serve as ideal conductor boundaries of the vertically-polarized antenna. According to the invention, based on the idea of structure multiplexing, the slot antenna is multiplexed as an ideal electric conductor to recover the equivalent boundary condition of an infinite area array, so that the bandwidth expansion is realized; meanwhile, the fishbone-shaped slot antenna and the folding dipole are designed, so that the dual-polarization bandwidth of the antenna is further improved, and the profile height of the array is reduced.

The invention discloses a dual-frequency dual-polarization duplex phased array for multi-standard communication, aims to solve the technical bottleneck of the existing millimeter wave phased array in frequency band compatibility, polarization diversity and duplex operation, and comprises a millimeter wave broadband dual-polarization end-on-fire antenna and a dual-frequency dual-polarization duplex phased array architecture. According to the phased array established by the invention, four sets of independent beam forming systems are integrated on a single printed circuit board and correspond to a first frequency band vertical polarization channel, a first frequency band horizontal polarization channel, a second frequency band vertical polarization channel and a second frequency band horizontal polarization channel respectively, and concurrent transmission and independent beam control of dual-frequency-band and dual-polarization signals are supported. The phased array realizes two-dimensional expandability based on a brick-shaped framework, can be used for constructing a planar array, and is suitable for a large-scale deployment scene. The compact size and low-cost scheme provides a high-integration, high-flexibility and high-reliability communication solution for B5G / 6G multi-standard scenes such as intelligent transportation, industrial Internet of Things and smart home.

The invention provides a radar signal anti-interference processing method and system based on a space-time attention mechanism. The method comprises the following steps: mapping an original horizontal polarization channel signal and an original vertical polarization channel signal into an interference suppression space, and generating a three-dimensional feature tensor comprising an amplitude component, a polarization phase difference component and an interference suppression residual component; according to the amplitude component, dividing a radar observation area into multiple layers of target blocks in a spatial dimension, and calculating a space-time association weight between adjacent layers of target blocks through a space-time attention mechanism; and according to the space-time correlation weight, screening out a plurality of target blocks meeting a preset continuous motion condition, and decoding a motion mode of the plurality of target blocks by using a long short-term memory network to generate an anti-interference target trajectory coordinate and a velocity vector. According to the method, the polarization characteristics and the space-time attention mechanism are fused, the anti-interference effect of radar signal processing in a strong interference environment is improved, and then the detection precision of the multi-target motion trail is improved.

The invention discloses an end-fire millimeter wave antenna with a dual-polarization filtering characteristic, which comprises a horizontal polarization end-fire filtering antenna unit and a vertical polarization end-fire filtering antenna unit, and the horizontal polarization end-fire filtering antenna unit and the vertical polarization end-fire filtering antenna unit form a shared aperture to realize fusion. The end-on-fire structure has the remarkable advantages that firstly, compared with an edge-on-fire antenna, the end-on-fire antenna can provide a relatively balanced radiation characteristic in a more compact space, so that interference of a metal back shell in the terminal equipment on a radiation mode is effectively avoided, and the radiation efficiency and the performance stability of the antenna are remarkably improved; secondly, the design of the end-fire dual-polarization filtering antenna is realized by adopting a fusion mode, the integration performance of the antenna and a radio frequency front-end system is optimized, and the antenna has remarkable advantages in the aspects of reducing the size, improving the bandwidth, enhancing the anti-interference capability, improving the operation stability and the like; and a brand new technical scheme is provided for efficient operation of the radio frequency front end in the terminal equipment.

The invention relates to the technical field of tunnel construction equipment, and discloses an annular scanning complete polarization ground penetrating radar system carried on a TBM (Tunnel Boring Machine), and the system comprises a control unit which is disposed in a TBM control room and is used for transmitting a control signal and receiving and storing measurement data; the fully-polarized ground penetrating radar antenna array is mounted in a gap between cutter spokes and is used for transmitting and receiving electromagnetic waves; each group comprises two transmitting antennas and two receiving antennas; the two transmitting antennas transmit horizontally polarized electromagnetic waves and vertically polarized electromagnetic waves respectively, the two receiving antennas receive horizontally polarized echoes and vertically polarized echoes respectively, and a complete 2 * 2 scattering matrix of a front annular area is obtained by rotating the fully polarized antenna array through the cutterhead to complete a measurement period. The multi-polarization radar antenna is adopted, the scattering characteristic information of the target body can be comprehensively obtained by transmitting and receiving electromagnetic wave signals in multiple polarization states, and more comprehensive information can be provided for target recognition under complex geological conditions.

The invention discloses a dual-polarization one-dimensional scanning phased-array antenna and a weather radar system, the antenna comprises a radiation layer, a first feed layer, a first PCB layer, a second feed layer, a second PCB layer and a third feed layer which are stacked from top to bottom, and a horizontal polarization radiation unit and a vertical polarization radiation unit of the radiation layer are arranged in an orthogonally staggered manner; each first feeder is etched on the top surface of the first PCB layer and corresponds to a first metal groove formed in the bottom of the first feed layer and a second metal groove formed in the top of the second feed layer in position; and each second feed line etched on the top surface of the second PCB layer corresponds to the position of a third metal groove formed in the bottom of the second feed layer and the position of a fourth metal groove formed in the top of the third feed layer. According to the invention, high cross polarization isolation is realized, and the antenna has dual polarization beams with low side lobes and consistent beam width and pointing height in the whole working frequency band.

The invention provides a microstrip antenna and electronic equipment, and relates to the technical field of antennae, and the microstrip antenna comprises a microstrip antenna body, a first liquid crystal phase shifter arranged at the horizontal polarization feed position of the microstrip antenna, and a second liquid crystal phase shifter arranged at the vertical polarization feed position of the microstrip antenna. The first liquid crystal phase shifter and the second liquid crystal phase shifter are configured to respond to the bias voltage signal to control the phase difference between the horizontal polarization wave and the vertical polarization wave of the microstrip antenna so as to control the microstrip antenna to be switched between the first circular polarization mode and the second circular polarization mode. According to the scheme, the first liquid crystal phase shifter and the second liquid crystal phase shifter are integrated in the microstrip antenna to control the microstrip antenna to be switched between the first circular polarization mode and the second circular polarization mode, so that the integration level of the microstrip antenna is effectively improved, the miniaturization design of the antenna can be realized, and the cost can be reduced.

The invention discloses a frequency domain adaptive clutter suppression method and system for a dual-polarization weather radar, and relates to the technical field of weather radar processing. According to the invention, pulse-level quality control and ground feature identification marking are carried out on radar original echoes; calculating power spectrums of the marking units, performing dynamic noise measurement and data quality grading, and screening out effective processing units; constructing a Gaussian mixture model of a power spectrum of an effective unit, and iteratively estimating model parameters through an expectation maximization algorithm to realize complete separation of a ground feature spectrum and a meteorological spectrum in a frequency domain; inverting single-channel parameters based on the separated meteorological spectrum; a cooperative spectrum separation strategy is adopted for horizontal and vertical polarization channels, and dual-polarization parameters such as differential reflectivity, correlation coefficients and differential phases are inverted based on the filtered dual-channel signals; according to the invention, high-precision separation of clutters and meteorological echoes is realized, the loss of meteorological signals is significantly reduced while ground features are effectively suppressed, and the accuracy and reliability of dual-polarization parameter inversion are improved.

A ceiling-mounted antenna (10), comprising: an antenna base (1); a vertical-polarization antenna (2), which comprises a reflecting plate (21) and an antenna element (22), the reflecting plate (21) being located between the antenna base (1) and the antenna element (22); a horizontal-polarization antenna (3), wherein a plurality of patch units (31) are distributed at intervals around the antenna element (22) and are located on the side of the reflecting plate (21) away from the antenna base (1); and a passive frequency-mixing module (4), which comprises a dielectric substrate (41), a passive frequency-mixing circuit (42) and a power division network (43), wherein the passive frequency-mixing circuit (42) is electrically connected to both the antenna element (22) and the power division network (43), and the power division network (43) is electrically connected to the plurality of patch units (31). On the basis of a low-frequency signal transmitted by means of a DAS, a 5G signal is obtained under the action of the passive frequency-mixing circuit (42), thereby implementing 5G communication of the ceiling-mounted antenna (10), and improving the indoor 5G communication quality. (FIG. 1)

A vehicle includes a window with an antenna assembly. The window includes a glass surface, a metal frame, and a set of defroster wires. A top defroster wire and a top edge of the metal frame define an antenna region. The antenna assembly includes a slot antenna disposed within the antenna region. The slot antenna is disposed on a glass surface of the window in a visible region of the window with a top side located proximate a horizontal cover line of the metal frame. A feed point is located in a central area of the slot antenna, and a first slot and a second slot of the slot antenna intersect at the feed point. A feed line extends from the feed point through a separation gap between the metal frame and the glass surface to connect the slot antenna to a communication device.

The utility model provides an antenna device and a household intelligent gateway, the antenna device comprises a first printed board, a second printed board, a third printed board and a fourth printed board, the first printed board and the second printed board are stacked, the third printed board and the fourth printed board are located between the first printed board and the second printed board, and the surface of the first printed board is provided with a first radiation arm and a second radiation arm which are perpendicular to each other and are not connected; the third printed board is provided with a first feed structure and a second feed structure, and the first radiation arm is electrically connected with the first feed structure, so that the first antenna generates horizontal polarization; the second radiation arm is electrically connected with the second feed structure, so that the second antenna generates horizontal polarization orthogonal to the first antenna; the fourth printed board is provided with a third radiation arm perpendicular to the first printed board and a feed port connected with the third radiation arm, and the feed port is connected with the grounding layer on the second printed board so that the third antenna can generate vertical polarization orthogonal to the first antenna and the second antenna. According to the invention, the three linear polarized antennas which are perpendicular to one another are adopted, the space occupied by multiple antennas is reduced, and the capability of receiving different polarized signals is improved.

A system and method for determining an error vector magnitude (EVM) of a polarized transmission from a device-under-test (DUT). A first signal transmitted by the DUT is received via a horizontally polarized receiver antenna, and a second signal transmitted by the DUT is received via a vertically polarized receiver antenna. The second signal is coherent with the first signal. The EVM is calculated based at least in part on the first signal and the second signal and a reference signal.

A single-layer broadband vertically polarized endfire magnetoelectric dipole (ME-dipole) antenna and an antenna array. The main radiator of this antenna is a substrate-integrated closed loop, which consists of two horizontal metallic strips printed on the upper and lower surfaces of substrate and a pair of vertical metallic vias. Excited by a double-sided parallel-strip line at the center of the loop, the metallic vias function as electric dipoles while the entire loop aperture works as magnetic dipole. To facilitate integration, this magnetoelectric dipole loop antenna is fed by an open-ended substrate integrated waveguide (SIW), which also works as a backed cavity to enhance the front-to-back ratio. Moreover, rectangular slots are etched at the edges of the SIW aperture to further improve the front-to-back ratio and also the cross-polarization performance. Thus, a vertically polarized endfire ME-dipole loop antenna with a low-profile structure, broad bandwidth, and stable radiation performance is achieved.

The invention provides a broadband circularly polarized planar end-on-fire antenna based on a substrate integrated waveguide. The broadband circularly polarized planar end-on-fire antenna comprises a wave port, the substrate integrated waveguide and a dipole antenna, the wave port is connected with one side, far away from the dipole antenna, of the dielectric substrate and is used for generating an excitation signal through feed and driving electromagnetic wave transmission in the substrate integrated waveguide, so that the substrate integrated waveguide generates a vertical polarization electric field component and the dipole antenna generates a horizontal polarization electric field component; by adjusting the amplitude-phase relation between the two orthogonal polarization electric field components, broadband circular polarization radiation is realized. The broadband circularly polarized plane end-on-fire antenna does not need an additional radiation structure to compensate the vertical polarization component, avoids the increase of the profile height due to the addition of the additional structure, achieves the low profile design, and enables the structure to be more compact. The dipole antenna is directly connected with the upper metal plate and the lower metal plate, so that the overall size of the antenna is greatly reduced, the occupied space is reduced, the manufacturing process is simplified, and the production process and the material cost are reduced.

The invention relates to a planar end-fire dual-frequency circularly polarized antenna with a small frequency ratio, which comprises a first magnetic dipole unit used for providing a vertical polarization component, and the first magnetic dipole unit comprises a medium, a first patch assembly, a first short circuit assembly and a feed end, the first patch assembly and the first short circuit assembly form a first cavity; the feed end is arranged on the first patch assembly; the second electric dipole unit comprises a first folding structure and a second folding structure, the second folding structure is a reverse folding structure of the first folding structure, and the second folding structure and the first folding structure form a complementary structure at the tail end. According to the invention, the structure is simple, the requirements of circular polarization phases of two frequency bands can be met at the same time, and the design complexity and the processing and manufacturing cost are greatly reduced; the complementary structure of the folded electric dipole tail end structure and the reverse extension branch knot can realize a small frequency ratio of about 1.3, and has the advantages of high gain and wide impedance bandwidth at high frequency.

The invention discloses a millimeter wave dual-polarization phased-array antenna beam forming method and device, and relates to the technical field of high-frequency communication, and the method comprises the following steps: obtaining a complex weight signal of each array element in an antenna array under a horizontal polarization channel and a vertical polarization channel, respectively carrying out amplitude response and phase response acquisition and calibration processing on the complex weight signal; performing dynamic extraction and modeling on amplitude errors and phase errors of each array element in different polarization channels; on the basis of error estimation, constructing a machine learning prediction module comprising a time sequence prediction model; performing joint estimation on a real-time error estimation result and a prediction error result; constructing a hardware-software collaborative calibration structure comprising a dynamic gain control module on the basis of the compensation weight; beam focusing of the target space area is realized; according to the invention, the hidden problems of beam offset, sidelobe lifting, gain loss and the like caused by inconsistency of polarization channels are solved.

The invention relates to the technical field of satellite-borne radio frequency signal processing, and discloses a radio frequency interference joint detection method and system for a satellite-borne radiometer, and the method comprises the steps: receiving horizontal polarization and vertical polarization analog signals through the satellite-borne radiometer, respectively inputting the analog signals into independent ADC channels, converting the analog signals into digital signals, and carrying out the preprocessing of the two digital signals; performing digital channelization processing on the pre-processed signal by adopting a multi-term filter bank which is divided at equal intervals, and dividing the pre-processed signal into a plurality of sub-band signals; for each sub-band signal, first-order to fourth-order central moments of the horizontal polarization signal and the vertical polarization signal are respectively calculated within preset integral time, and then a kurtosis value is calculated through second-order and fourth-order central moments; the detection threshold is set to meet the detection index, the radio frequency interference is detected and identified on each sub-band based on the set detection threshold and the kurtosis value obtained through calculation, the kurtosis detection and the polarization detection are sequentially combined to output a radio frequency interference identification signal, and the detection sensitivity and performance are improved.

The invention discloses a compact broadband low-coupling tri-polarization dielectric resonator antenna based on a non-uniform medium, a pair of orthogonal horizontal polarization TEx and TEy resonant modes is excited in the dielectric resonator antenna by utilizing differential feed, the frequency points of the TE111 and TE113 resonant modes of a dielectric resonator are adjusted to be close to each other, and the directional diagrams of the two modes are similar, so that the frequency points of the TE111 and TE113 resonant modes of the dielectric resonator are close to each other. The working bandwidth of the antenna is effectively improved; on the basis, a probe is inserted into the center of the dielectric resonator to excite a vertical polarization TM011 mode of the dielectric resonator, the working frequency bands of the three modes are highly overlapped, and the design of the broadband tri-polarization antenna is realized; meanwhile, the dielectric block with the dielectric constant higher than that of the original dielectric is embedded into the dielectric resonator, so that the working bandwidth of the antenna is increased; the annular gap is etched on the floor around the probe, so that the coupling among the ports is reduced; according to the invention, the tri-polarization common bandwidth reaches 47.7%, the size is 0.326 * 0.326 * 0.326 lambda03, and the bandwidth area ratio reaches 449% / lambda02.

System, Apparatus and Method for characterizing subsurface electromagnetic properties of multiple material layers, the method includes producing at least a electromagnetic waves centered at a predetermined frequency with a specified bandwidth through a dual-polarized transmitter array to generate at least a orthogonally-polarized electromagnetic waves, transmitting the orthogonally-polarized electromagnetic waves into a ground target includes a set of multiple material layers, detecting, through a set of dual-polarized receiving antennas, reflected electromagnetic waves from subsurface layer boundaries, where the set of receiving antennas are oriented to capture both parallel and perpendicular polarizations relative to the transmitted waves, implementing, through a processing unit, at least a four-dimensional suppression of unwanted signals from the detected reflected electromagnetic waves, determining electromagnetic properties of the detected subsurface material layers through spiral estimation, calculating, for detected material layer at least, a dielectric permittivity, a conductivity, a wavelength and a skin depth based on the reflected electromagnetic waves.