81 results about "High frequency radiation" patented technology

The invention discloses an optical remote sensing satellite high and low frequency relative radiation error correction method and system, and the method comprises the steps: S1, carrying out the systematic high frequency radiation error calibration of a remote sensing image, so as to eliminate stripe noise; s2, performing frequency domain decomposition on the image after high-frequency correction, and separating high and low frequency components; s3, calculating a global statistical moment of the low-frequency component as a correction reference; s4, calculating a local statistical moment of the low-frequency component column by column; s5, calculating an independent correction coefficient for each column according to the global and local statistical moments; s6, correcting the low-frequency component by using the correction coefficient; and S7, recombining the corrected low-frequency component with the original high-frequency component to generate a final image. The method is suitable for improving the quality of the remote sensing image with multiple composite radiation errors, high-frequency stripes and low-frequency brightness gradient can be effectively eliminated, original texture details of ground features are reserved to the maximum extent in the correction process, and the radiation fidelity is guaranteed.

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

The invention discloses a laser cutting machine tool security early warning system based on multi-parameter analysis, which relates to the technical field of laser cutting equipment and comprises a front-end sensing layer, a core processing layer and an early warning distribution layer, the front-end differential conditioning circuit is matched with the electric-optical-electric optical fiber transmission link, a high-frequency radiation path of the laser generator and the servo motor is cut off in a physical layer, millisecond-level real-time stripping of dynamic electromagnetic noise is achieved, the problem of weak sensing signal distortion is fundamentally solved, and the detection precision is improved. And meanwhile, the characteristic frequency of the servo motor is stripped in combination with variational mode decomposition, so that the reconstructed monitoring signal has an extremely high signal-to-noise ratio, the crossing from simple early warning to intelligent diagnosis is realized through collaborative analysis of current, vibration and optical data, the risk of mistaken shutdown caused by interference is greatly reduced, the machining continuity is guaranteed, and the working efficiency is improved. And the data transmission delay is greatly reduced, and the security of the equipment is protected to the greatest extent in cooperation with the multi-stage synchronous notification of the early warning distribution layer.

The invention discloses an ultra-wideband miniaturized vertical polarization horizontal omnidirectional radiation antenna, and belongs to the technical field of antenna engineering and wireless communication. The antenna comprises a vertical polarization radiator, a metal top cap, a parasitic metal column, a metal floor and a polarization surface, wherein the vertical polarization radiator is composed of four miniaturized Vivaldi antennas which are placed towards the end-fire direction; the metal top cap and the metal floor are respectively located above and below the radiator, the polarization surface surrounds the periphery of the radiator, and two ends of the parasitic metal column are respectively connected with the metal top cap and the metal floor. The miniature Vivaldi antenna is adopted to form the radiator, so that the problem of distortion of a high-frequency radiation pattern caused by the size of an ultra-wideband antenna is solved; a low-frequency magnetic dipole radiation mode is formed by using the parasitic metal columns, the metal top caps and the metal floor, and the low-frequency bandwidth is expanded. On the basis of miniaturization, the antenna provided by the invention can realize S11lt in 1-6GHz; and vertical polarization horizontal omnidirectional radiation of-10dB is realized, and the out-of-roundness of an omnidirectional radiation pattern is less than 3dB.

The invention discloses a multi-frequency antenna radiation unit device with a decoupling function, and belongs to the field of mobile communication antennas. The high-frequency radiation unit comprises a balun electrically connected with the reflecting plate and a radiation arm connected to the balun; the low-frequency radiation unit is positioned on the periphery of the high-frequency radiation unit and is arranged on the reflecting plate; the capacitor loading assembly comprises a coupling patch connected with the radiation arm and a capacitor branch connected to the balun, the capacitor branch is located on the side, close to the reflecting plate, of the balun, the coupling patch and the capacitor branch form an additional capacitor connected with the high-frequency radiation unit in parallel, and the total equivalent capacitance of the high-frequency radiation unit is changed through the additional capacitor; therefore, the resonant frequency of the high-frequency radiation unit is shifted out of the low-frequency working frequency band, common-mode resonance generated when the high-frequency radiation unit and the low-frequency radiation unit are adjacently arranged is eliminated, the standing-wave ratio of a low-frequency port is improved, the working bandwidth is widened, distortion of a low-frequency radiation pattern is eliminated, and the coverage quality of a base station is guaranteed.

The invention is applicable to the technical field of communication, and provides a frequency selection boundary and a multi-frequency array antenna, which comprises a reflecting plate, low-frequency radiation units, high-frequency radiation units and a frequency selection boundary, and is characterized in that the high-frequency radiation units are symmetrically distributed by taking the midpoint of the reflecting plate as the center to form a high-frequency array; the low-frequency radiation units are nested between two rows of adjacent high-frequency radiation units to form a low-frequency array, and the frequency selection boundary is arranged at the center of the reflecting plate. Therefore, according to the frequency selection boundary and the multi-frequency array antenna provided by the invention, good radiation of each frequency band of the multi-frequency antenna is ensured.

This invention discloses a microwave heating device with high-order mode suppression, belonging to the field of microwave heating technology. It includes: a heater comprising a rectangular waveguide and metal ridges; the rectangular waveguide has a microwave cavity extending laterally; two metal ridges are symmetrically arranged front-to-back within the microwave cavity, with a front-to-back spacing between them, and each ridge has a material passage hole extending front-to-back; and two high-order mode suppressors, respectively located at the front and rear ends of the heater, each high-order mode suppressor having a material cavity for the workpiece to be heated to pass through, extending front-to-back and communicating with the material passage hole. This invention features a compact structure, strong electric field, rapid and uniform heating, and protection against high-frequency radiation, preventing harm to operators from microwave spatial radiation and ensuring the safe use of the microwave heating device.

The utility model provides a radiation assembly and an antenna, the radiation assembly comprises a low-frequency oscillator and a high-frequency oscillator, an installation space is formed in the low-frequency oscillator, an installation table is arranged in the installation space, a through installation channel is formed in the installation table, the high-frequency oscillator is embedded in the installation space, and the high-frequency oscillator is embedded in the installation space. The high-frequency oscillator comprises a high-frequency radiation arm, a supporting piece and a feed core, the high-frequency radiation arm is connected with the supporting piece, the supporting piece penetrates through the mounting channel, a through feed channel is formed in the supporting piece, and the feed core penetrates through the feed channel to feed the high-frequency radiation arm. The radiation assembly is provided with the supporting piece led out of the low-frequency oscillator, so that the feed core of the high-frequency oscillator is led out of the low-frequency oscillator through the feed channel in the supporting piece, the feed core is electrically connected with a coaxial cable conveniently, the coaxial cable does not need to be led into the low-frequency oscillator, and the electrical performance of the radiation assembly is improved.

The application discloses a large-diameter Ku / Ka co-caliber VICTS antenna with a wide-band feed network, and belongs to the field of mechanically scanning antenna arrays. The antenna is composed of an upper metal disc and a lower metal disc, the upper metal disc is provided with co-caliber radiation branches, the lower metal disc is provided with a feed structure, and the two metal discs can rotate relative to each other; the co-caliber radiation branches include first staggered waveguide radiators and second staggered waveguide radiators which are arranged alternately; wherein the first staggered waveguide radiators are high-low frequency shared radiators, and the second staggered waveguide radiators are high frequency radiators. The antenna solves the problems of high profile height and insufficient bandwidth faced by traditional VICTS antennas, and has a similar basic working principle to the traditional VICTS antenna, so that the existing VICTS antenna can be directly replaced without changing the related control and servo technology.

The utility model discloses a high-frequency electromagnetic radiation monitor, and relates to the technical field of electromagnetic radiation monitoring. The high-frequency radiation monitor comprises a high-frequency radiation monitor body, an expansion fixing frame is fixedly arranged at the bottom end of the high-frequency radiation monitor body, an overturning frame is rotatably arranged on the expansion fixing frame, a pushing overturning assembly used in cooperation with the overturning frame is arranged in the expansion fixing frame, and an overturning protection assembly is arranged on the overturning frame. A photovoltaic panel is arranged in the turnover protection assembly; according to the utility model, by arranging the pushing overturning assembly, the pushing overturning assembly drives the overturning frame to overturn with the overturning shaft as the axis, so that the overturning frame is overturned and unfolded to drive the photovoltaic panel to overturn synchronously, and the photovoltaic panel is convenient to store and unfold; and by arranging the foldable photovoltaic panel capable of being stored, light energy is converted into electric energy to achieve a continuous function on the high-frequency radiation monitor body, so that the cruising ability is improved.

This invention provides a self-decoupling intermediate frequency (IF) radiating element and a mobile communication antenna, relating to the technical field of wireless communication. The self-decoupling IF radiating element includes a radiating substrate, a dielectric block, two sets of orthogonally polarized dipoles, and four metal patches. The mobile communication antenna includes the self-decoupling IF radiating element. Each metal patch of the self-decoupling IF radiating element forms a capacitive-inductive resonant circuit with each radiating arm. This resonant circuit can add at least one high-frequency resonant point, ensuring that the electrical performance of the self-decoupling IF radiating element remains unaffected while possessing the characteristic of transmitting high-frequency electromagnetic waves. This allows electromagnetic waves generated by the high-frequency radiating element nested below the self-decoupling IF radiating element to effectively pass through, thereby generating good radiation into space. Specifically applied in mobile communication antennas, this eliminates the need for additional decoupling circuits, does not increase insertion loss, and reduces the design complexity and size of common-aperture antennas.

The application relates to a single-layer multi-frequency GNSS antenna, which comprises a patch antenna body, the patch antenna body comprises a dielectric substrate and a ground plane, the center of the upper surface of the dielectric substrate is provided with a clover-shaped high-frequency radiation metal plate, the periphery of the high-frequency radiation metal plate is provided with a low-frequency radiation metal plate, a first non-metal gap is arranged between the high-frequency radiation metal plate and the low-frequency radiation metal plate, four edges of the low-frequency radiation metal plate are provided with accommodation grooves, long-strip-shaped radiation metal patches are arranged in the accommodation grooves, and rectifier radiation parts are arranged between four corners of the low-frequency radiation metal plate and adjacent two accommodation grooves, and the four rectifier radiation parts correspond to four sharp corners of the clover-shaped high-frequency radiation metal plate. The application belongs to the technical field of antennas, the radiation performance of the antenna is optimized through a special geometric layout, the foundation of antenna miniaturization and low cost is laid, and the dual-band coverage and good radiation characteristics are preliminarily ensured.

The invention provides a broadband wave-transparent base station antenna, relates to the technical field of microwave and millimeter wave communication, and solves the technical problem that most common-caliber base station antenna design schemes in the prior art are relatively narrow in wave-transparent bandwidth. According to the technical scheme, the antenna comprises a low-frequency radiation unit, a high-frequency radiation unit and a rectangular reflection ground; the four high-frequency radiation units are arranged at the four corner ends of the low-frequency radiation unit respectively. Compared with a traditional frequency selective surface structure, more capacitance and inductance components are introduced, and the broadband wave-transparent performance is achieved.

A wide-band wave-transmitting / filtering radiation unit, a shared-aperture antenna array, and a communication device are disclosed. The radiation unit includes a radiation structure and a feed structure, where the radiation structure and the feed structure are coupled for feeding, so that the radiation structure radiates low-frequency electromagnetic wave signals outward; the radiation structure includes a radiator, and the radiator is loaded with a plurality of layers of surface periodic structures; when the radiation structure operates in a first mode, electromagnetic waves excited by a high-frequency radiation unit irradiates the radiation structure, and the radiator and the plurality of layers of surface periodic structures collectively form a non-resonant node spatial band-pass filter circuit with K resonant points and K null points; and when the radiation structure operates in a second mode, low-frequency electromagnetic waves excite the radiation structure by means of the feed structure, and units of the plurality of layers of surface periodic structures are excited by the radiator in a parallel manner to form an equivalent filter circuit. The present disclosure can improve radiation pattern distortion of a multi-band antenna, and enhance indexes such as antenna gain, out-of-band suppression, and a cross-polarization ratio.

The invention discloses a common-aperture dual-frequency antenna with a directional diagram conformal characteristic, and belongs to the technical field of microwave antennas. According to the antenna array disclosed by the invention, the high-frequency radiation pattern can still keep stable performance under the condition that the high-frequency antenna and the low-frequency antenna are in the same aperture. The high-frequency antenna unit and the low-frequency antenna unit both adopt annular dipole radiators, and a feed part adopts a balance balun; the radiation arm of the low-frequency unit does not need to be modified, and coupling can be eliminated only through induction of a simple patch, so that the design process and the design complexity of the base station common-caliber antenna are greatly simplified. The antenna array has a wide prospect in design and application of base station antennas.

The utility model provides a variable polarization test system for a high-frequency radiation sensitivity horn antenna, and relates to the technical field of electromagnetic compatibility detection. The variable polarization test system for the high-frequency radiation sensitivity horn antenna comprises a lifting vehicle body, a cabinet is installed on the top of the lifting vehicle body, and a baffle is installed on the cabinet. By arranging the lifting vehicle body, the height of the horn antenna body can be conveniently adjusted, a transmitting antenna is aligned to a tested area to be tested, the height and polarization of the antenna are adjusted, meanwhile, the adjusting steps are simple, operation is convenient, the transmission path from a power amplifier output waveguide port to the antenna is short, loss is low, the system is stable and easy to use, and the vibration resistance is high; the test efficiency is greatly improved, and the waveguide rotary joint is arranged and is installed on the baffle through the rotary joint clamp, so that the waveguide rotary joint can drive the horn antenna body to rotate, and the purpose of angle adjustment is achieved.

This invention provides a grounding electromagnetic lock, comprising a housing, an electromagnetic actuation component, and a control circuit board. Both the electromagnetic actuation component and the control circuit board are housed within the housing. The lock also includes a connector and a grounding rod fixing mechanism. The grounding rod fixing mechanism includes a connecting rod body, a fixing nut, a first gear, and a second gear. The fixing nut is located on the connecting rod body. A universal connector is detachably provided at the bottom of the connecting rod body for connecting the grounding rod. When the connecting rod body is inserted into the connector, the first and second fixing handles are used to tightly contact the bottom surface of the fixing nut after rotation. This invention fully considers interference types and volume requirements, and specifically designs each component of the electromagnetic lock to prevent electromagnetic interference. This ensures that the entire chain of wireless signal power supply, acquisition, processing, and transmission can effectively cope with switch operation surges, power frequency magnetic fields, and high-frequency radiation within substations, guaranteeing the reliability and stability of wireless signal transmission.

The utility model relates to a single-layer double-frequency GNSS antenna which comprises an antenna medium and a bottom layer metal structure, a high-frequency radiation metal patch is arranged at the center position of the upper surface of the antenna medium, a low-frequency radiation metal patch is arranged on the upper surface of the antenna medium, fan-shaped metal radiation patches are arranged at the four corners of the antenna medium, and the fan-shaped metal radiation patches are arranged on the bottom layer metal structure. An arc-shaped isolation seam is arranged between the fan-shaped metal radiation patch and the low-frequency radiation metal patch; metal through hole structures are arranged on the high-frequency radiation metal patch, the low-frequency radiation metal patch and the fan-shaped metal radiation patch, and feeding points are arranged on the high-frequency radiation metal patch and the low-frequency radiation metal patch. The utility model belongs to the technical field of antennas, a high-frequency radiation metal patch and a low-frequency radiation metal patch are arranged on an antenna medium and are isolated through a non-metal gap, a double-frequency function is obtained, the size of the antenna is effectively reduced, complexity of a traditional multi-layer structure is avoided through a single-layer integrated design, and miniaturization application is facilitated.

A method and system for reducing radiation at predetermined frequencies using delay elements and related devices is disclosed. The device includes an input terminal (102) for receiving a signal (104), a delay element (108) electrically connected to the input terminal, an output terminal (112) for providing a slew rate reduced signal (114), and a combining circuit (116) electrically connected to the delay element and the output terminal. The delay elements provide delayed signals (110) responsive to the received signal. Each of the delayed signals includes a delayed version of the received signal. The combining circuit combines the delayed signals to generate the slew rate reduced signal. The delays associated with the delay elements are selected to reduce radiation at one or more predetermined frequencies of the slew rate reduced signal compared to the received signal.

The application relates to a dual-frequency dual-polarized millimeter wave array antenna with wide-angle scanning capability and an electronic device with the same. The millimeter wave array antenna comprises, from top to bottom and sequentially stacked and separated from each other: a high-frequency radiation layer comprising a plurality of high-frequency radiation units arranged periodically, the high-frequency radiation units being dual-polarized radiation units with a first working frequency band; a low-frequency radiation layer comprising a plurality of low-frequency radiation units arranged periodically, the low-frequency radiation units being dual-polarized radiation units with a second working frequency band, the second working frequency band being non-overlapping with the first working frequency band, and the second working frequency band being lower than the first working frequency band; and an electromagnetic bandgap layer having a third working frequency band and a fourth working frequency band which are non-overlapping with each other, the fourth working frequency band being lower than the third working frequency band, the third working frequency band corresponding to the first working frequency band, and the fourth working frequency band corresponding to the second working frequency band.

The application relates to a 4G full-band main antenna suitable for a wearable device, which comprises a wearable device shell serving as an antenna support and provided with a low-frequency radiation branch, a medium-frequency radiation branch, a high-frequency radiation branch and a medium-frequency coupling radiation branch on the surface respectively. The low-frequency radiation branch is in an inverted F structure, two short branch ends of which are respectively provided with a feeding point and a second grounding point to jointly form a PIFA antenna basic structure. The high-frequency radiation branch is provided with a first grounding point for generating high frequency. The medium-frequency radiation branch is connected with the low-frequency radiation branch. The medium-frequency coupling radiation branch is provided with a third grounding point, and the medium-frequency coupling radiation branch is coupled with the low-frequency radiation branch to generate medium frequency, and the medium frequency generated by the medium-frequency coupling radiation branch is superposed with the medium frequency generated by the medium-frequency radiation branch to increase the medium-frequency bandwidth. The antenna clearance of the application is only 2mm, supports a narrow black border and a high screen ratio appearance, the efficiency is improved by about 2dB compared with a traditional antenna, the bandwidth is wider, the structure is simple, the manufacturing is simple, the mass production consistency is high, the loss is low and the reliability is high.

The present invention relates to a high-frequency radiation unit and a multi-frequency base station antenna. The high-frequency radiation unit comprises a radiator, a vibrator base, a first feeding member and a second feeding member. The distance between a first vertical section and a center line is greater than the distance between a first balun and the center line, and the distance between a second vertical section and the center line is greater than the distance between a second balun and the center line, that is, the first vertical section is disposed on one side of the first balun away from the center line, and the second vertical section is disposed on one side of the second balun away from the center line.

The invention discloses an anti-unmanned aerial vehicle antenna device and anti-unmanned aerial vehicle equipment, and the device comprises a pedestal which comprises a first region and a second region; the low-frequency radiation unit is mounted in the first area; and the high-frequency radiation unit is arranged in the second area. The antenna is compact in structure, and can cover a plurality of frequency bands from low frequency to high frequency.

The invention discloses a miniaturized ultra-wideband and dual-polarization angle and frequency reconfigurable Vivaldi antenna, which comprises two antenna units which are arranged in a crisscross manner, each of the two antenna units comprises a dielectric substrate, an antenna radiating surface, a feed port and a PIN diode, the antenna radiating surface is divided into a high-frequency radiating surface and a low-frequency radiating surface, and the feed port is connected with the dielectric substrate. The high-frequency radiating surface and the low-frequency radiating surface are connected through a PIN diode, and the working frequency is selected through the connection and disconnection of the PIN diode; the high-frequency radiation surface is provided with a feed port. And an auxiliary bracket capable of selecting a plurality of cross angles is arranged at the cross connection position of the two antenna units. Compared with an existing dual-polarization Vivaldi antenna, the dual-polarization Vivaldi antenna can be selectively provided with a bridge to achieve switching between single polarization and dual polarization, a multi-angle dual-polarization adjusting effect is achieved by changing the cross direction through the support, and space utilization and multi-scene application are achieved by fully utilizing the array interval size.

The utility model discloses a high-frequency shielding cover lifting structure, which relates to the technical field of high-frequency equipment and comprises an equipment cabinet, an equipment cavity and a processing bin are respectively arranged in the equipment cabinet, a lead screw lifting device is fixedly mounted in the equipment cavity, and a driving end of the lead screw lifting device is connected with a shielding cover. The opening is used for driving the shielding cover to lift to block or open the processing bin. According to the high-frequency shielding cover lifting structure, the mechanical lead screw lifting device is adopted to automatically control lifting of the shielding cover, a traditional manual operation mode is effectively replaced, and therefore the safety and the automation level of the high-frequency pressing process are greatly improved. By means of the improvement, the possibility that operators are exposed to the risk of high-frequency radiation is remarkably reduced, the overall efficiency and stability of the pressing process are effectively improved, and a solid foundation is laid for continuous optimization of product quality and reasonable control of production cost.

Method for determining the layer thicknesses of a sample with a known plurality N of superimposed layers S i , with i = 1, 2, 3, ..., N, with the steps: a) Generating pulses of electromagnetic high-frequency radiation with a predetermined frequency bandwidth, b) Irradiating the sample with electromagnetic high-frequency radiation and c) Time-resolved measurement of the electric field E P (t) the electromagnetic radiofrequency radiation reflected by or transmitted through the sample, d) Selecting a layer thickness d i , an absorption index k i and a refractive index n i for each layer S i , with i = 1, 2, 3, ..., N, e) Calculating a time-dependent electric field E M(t) for the electromagnetic high-frequency radiation reflected by or transmitted through the sample using a model, wherein the model defines a time-dependent electric field E according to the number N+1 interfaces between the measurement environment and the sample, as well as between the individual layers. j (t), with j = 0, 1, 2, 3, ..., N, taken into account, where the electric fields E j (t) depending on the layer thicknesses d i , the absorption indices k, which are assumed to be constant over the frequency bandwidth of the electromagnetic high-frequency radiation used i and the refractive indices n, which are assumed to be constant over the frequency bandwidth of the electromagnetic high-frequency radiation used. i to the time-dependent electric field E M (t) are added, f) Comparing the calculated electric field E M (t) with the detected electric field E P(t) g) when there is a deviation Q between the calculated electric field E M (t) and the detected electric field E P (t) is greater than a predetermined tolerance T, the layer thicknesses d i , the refractive indices n i and the absorption indices k i as long as the deviation Q is varied and steps e) to g) are repeated until the deviation Q is smaller than the tolerance T, and h) Providing the layer thicknesses d i as a result of the layer thickness determination, characterized in that initially for step d) and for a predetermined number of L repetitions of steps e) to g) the absorption index k i is selected from a range of values ​​that is small compared to the expected range of values ​​that the absorption index k represents. i for the respective shift S i a sample can assume and which is in relation to the maximum expected absorption index k ifor the respective layer includes small absorption indices.

The application relates to a multi-frequency antenna, which comprises a reflecting plate, a high-frequency radiation unit, a high-frequency feeding system, a low-frequency radiation unit and a low-frequency feeding system. The high-frequency feeding system comprises a high-frequency feeding cavity and a high-frequency feeding network arranged in the high-frequency feeding cavity. The high-frequency feeding network is electrically connected with the high-frequency radiation unit. The low-frequency feeding system comprises a low-frequency feeding cavity and a low-frequency feeding network arranged in the low-frequency feeding cavity, and the low-frequency feeding network is electrically connected with the low-frequency radiation unit. Since the high-frequency feeding cavity and the low-frequency feeding cavity are respectively arranged on the front surface and the back surface of the reflecting plate, sufficient space is provided without mutual influence. The arrangement structure is compact, the space of the front surface and the back surface of the reflecting plate is fully utilized, the width and the height of the antenna are greatly compressed, the high integration of the multi-frequency antenna is realized, efficient production, compact structure, high integration and miniaturization can be realized.

The invention relates to an identification method having improved spatial resolution, comprising at least one reading device and at least one tag, wherein the at least one tag is coded by means of a plurality of notches, and wherein under appropriate excitation the at least one tag supplies both a linear response and a non-linear response, the method comprising the steps of: identifying whether one or more tags are located at a location, identifying which of the tags is located at the location.The invention further relates to a system for the method according to the invention, comprising a reading device and at least one tag, wherein the reading device is configured to emit high-frequency radiation in a first frequency band in order to excite one or more tags, wherein the reading device is configured to vary the emitted radio-frequency radiation, and to receive radiation from at least one tag, and to determine a forward transmission parameter and / or an input reflection parameter.