119 results about "Leaky wave antenna" patented technology

The invention relates to a reconfigurable dual-mode leaky-wave antenna with global scanning capability and a reconfiguration method, the leaky-wave antenna comprises a double-layer slow-wave waveguide structure formed by an upper metal conductor and a lower metal conductor, and the upper metal conductor and the lower metal conductor are separated by a dielectric substrate; the double-layer slow-wave waveguide structure comprises a plurality of periodic units, and a plurality of T-shaped structures with opposite directions are processed on upper and lower layers of metal conductors of each periodic unit to form a plurality of grooves; a variable capacitance diode is embedded into the tail end of a slot arm of the upper-layer metal conductor and is electrically connected with the lower-layer metal conductor through a metal via hole, and a closed loop is formed between the upper-layer metal conductor and the lower-layer metal conductor; a plurality of elliptical radiation patches are arranged at the top of a slot arm of the lower metal conductor at intervals and used for radiation leakage of the slow wave waveguide, and continuous frequency scanning covering 180 degrees is achieved; according to the invention, two modes of frequency scanning and fixed-frequency scanning are fused, 180-degree global scanning can be realized in any frequency reconfigurable interval, and beams can be flexibly reconstructed through multiple control strategies under a fixed-frequency condition.

The invention relates to the technical field of wireless communication and sensing, and particularly discloses a holographic amplitude weighting-based two-dimensional antenna array multi-beam scanning method, which comprises the following steps of: determining the position information of each radiation unit in a two-dimensional antenna array, including calculating the interval and the arrangement mode of the units; an amplitude weighted value of each radiation unit is generated according to the target wave direction, a two-dimensional multi-beam holographic amplitude weighting technology is used, and the radiation unit amplitude weighted values are determined through the two-dimensional multi-beam holographic amplitude weighting technology; generating a corresponding binary discretization coding sequence based on the amplitude weighted value so as to control the excitation amplitude of each radiation unit; and designing a liquid crystal-based Ka-band two-dimensional holographic beam scanning leaky-wave antenna square array, and regulating and controlling a radiation pattern of a two-dimensional antenna array through the coding sequence to realize multi-beam scanning.

The technology described herein is directed towards a transceiver with beam scanning capability based on leaky wave antenna technology and substrate integrated waveguide technology, along with a metallic covering that determines which direction the antenna radiates signals. The leaky wave antenna can include different respective groups of slot pairs having different respective periodicities, corresponding to different respective beam steering directions. One or more metallic covers can be used to cover some of the slot pair sections, such that the sections under cover behave like a conventional substrate integrated waveguide and the exposed section(s) behave like conventional leaky wave antennas. The metallic covers can be moved as desired, such as attached via magnets. The transceiver can thus steer signals to a wearable or portable device that includes a passive metasurface while mitigating null regions. The slot pairs can be asymmetrical reflection-canceling slot pairs, to achieve broadside radiation while avoiding band-stop effects.

The invention relates to the technical field of antenna control, and discloses a control method for a leaky-wave antenna and a communication device. The method comprises the following steps: measuring the dispersion characteristic of the leaky-wave antenna, establishing a second-order nonlinear mapping relation between a propagation constant and a control voltage, and obtaining a dispersion control parameter group; reversely deducing the target beam directional angle to obtain a target propagation constant, and calculating an initial voltage value of each control unit in combination with the parameter group to form a voltage gradient control sequence; correcting the propagation constant of each unit by adopting a distance compensation algorithm, and recalculating to obtain distance self-adaptive voltage distribution data; and detecting a beam quality factor in real time, updating voltage distribution data through a gradient descent algorithm when the beam quality factor deviates from a target value, and outputting a control voltage sequence to drive each control unit. The leaky-wave antenna control method and device solve the problems that in an existing leaky-wave antenna control technology, the beam quality is reduced and the data rate is sharply attenuated during long-distance transmission, and the beam control precision and the long-distance transmission performance of the leaky-wave antenna in the terahertz frequency band are improved.

The invention provides a fixed-frequency beam scanning leaky-wave antenna and electronic equipment. The leaky-wave antenna comprises a first microstrip line and a second microstrip line, wherein the first microstrip line and the second microstrip line are used for transmitting radio frequency signals and are arranged at an interval; the N antenna units are connected to the first microstrip line and the second microstrip line, and each antenna unit comprises a first switch and a second switch; a first stub and a second stub, and an antenna. According to the technical scheme, the leaky-wave antenna is simple in structure, easy to process, high in expansibility and capable of reducing parasitism, transmission loss, element loss and the like.

The invention provides an arrival wave angle estimation method based on a zero scanning leaky-wave antenna. A rectangular waveguide is selected as a basic structure to design a periodic leaky-wave antenna only working in a-1 harmonic state; designing necessary antenna simulation parameters; a first leaky-wave antenna is designed; adjusting the gap interval p, and designing a second leaky-wave antenna; obtaining pattern functions of the first leaky-wave antenna and the second leaky-wave antenna; proper amplitude and phase parameters are selected for directional diagram synthesis, and a new directional diagram function is obtained; constructing an array guiding matrix suitable for the MUSIC algorithm; signal sources are arranged at different positions, simulation testing is carried out through MATLAB, and the incoming wave angle estimation capability of the zero-point scanning leaky-wave antenna is verified. According to the invention, a feasible technical path is provided for high-precision positioning and tracking application in future 6G mobile communication. The antenna is especially suitable for application in millimeter wave and terahertz frequency bands, such as vehicle-mounted communication, unmanned aerial vehicle platforms, military electronic countermeasures and the like.

The invention provides a leaky-wave antenna and a frequency-modulated continuous wave generation method based on the leaky-wave antenna, and relates to the field of millimeter-wave radar, and the method comprises the steps: constructing a space-time coding matrix, configuring a radiation unit state regulation and control beam direction in a space domain, modulating a radiation unit state switching rule in a time domain to generate a frequency-modulated continuous wave, and achieving space-time dual-domain regulation and control. And frequency-modulated continuous waves with controllable bandwidth are generated. The space-time coding leaky-wave antenna is formed by alternately arranging 1-bit radiation units in an upper row and a lower row, switching of radiation / non-radiation states is achieved by loading a synchronous bias PIN diode across an annular gap, a space-time coding matrix is constructed, the states of the radiation units are configured in a space domain to regulate and control the wave beam direction, and the space-time coding leaky-wave antenna is formed. Modulating the switching rule of the radiation unit in a time domain, and generating a frequency-modulated continuous wave; the radiation efficiency is improved by the alternative arrangement of the radiation units, the control difficulty and the hardware cost are reduced, multiple functions are integrated into a single device, and the problem of low integration level of the traditional separation architecture is solved.

The application provides an electrically-controlled beam scanning leaky-wave antenna and a communication device. The leaky-wave antenna comprises a gap waveguide including a strip-shaped ridge, the gap waveguide being used for transmitting electromagnetic waves in the form of a traveling wave, the strip-shaped ridge being arranged in the gap waveguide along a transmission direction of the electromagnetic waves; and a plurality of radiation units arranged on a side wall of the gap waveguide, each of the radiation units comprising a radiation slot and an electrically-controlled switch, the radiation slot being used for leaking electromagnetic waves in the gap waveguide to a free space to form a beam, and the electrically-controlled switch being used for controlling an operating state of the radiation slot to realize beam scanning. The leaky-wave antenna provided by the application can improve the beam tilting characteristics of the antenna and improve the communication quality of the antenna.

The application provides a leaky-wave antenna array based on a multimode substrate integrated waveguide coupler, relates to the technical fields of wireless communication and radar, and comprises a dielectric substrate, a multimode substrate integrated waveguide coupler and two leaky-wave antenna units. The multimode substrate integrated waveguide coupler is integrated on the dielectric substrate and is configured to excite modes and modes of the substrate integrated waveguide respectively in the same frequency range, generate even-mode signals with equal amplitude and in-phase and odd-mode signals with equal amplitude and opposite phase. The two leaky-wave antenna units are symmetrically arranged on the two sides of the upper surface metal layer of the dielectric substrate and are connected with two output ports of the multimode substrate integrated waveguide coupler respectively. The two leaky-wave antenna units are configured to radiate a wave beam and a difference wave beam in response to the even-mode signals and the odd-mode signals. The application solves the problem of low measurement accuracy of a traditional single-pulse antenna, has the technical effects of simplifying the design of a feed network, improving radiation performance and thus improving measurement accuracy.

The invention discloses an ultrahigh-scanning-rate leaky-wave antenna based on double-layer offset quasi-complementary SSPP. The antenna comprises a dielectric substrate, double-layer single-side offset quasi-complementary SSPP structures on the upper surface and the lower surface of the dielectric substrate, a double-layer mode conversion structure and a dielectric substrate top layer periodic modulation branch knot. Wherein the longitudinal symmetry axis of the dielectric substrate top layer single-side strip SSPP unit and the longitudinal symmetry axis of the dielectric substrate bottom layer single-side slot SSPP unit are relatively offset, and a double-layer single-side offset quasi-complementary SSPP unit is jointly formed; the double-layer mode conversion structure is composed of a trapezoidal gradual change structure on the top layer of the dielectric substrate and a periodic gradual change slotting structure on the bottom layer of the dielectric substrate; and the dielectric substrate top layer periodic modulation branch knot is formed by compounding a rectangular structure and a semicircular structure loaded at the tail end of the rectangular structure, and is positioned on the opposite side of the top layer single-side strip SSPP structure. The wide-angle scanning ultra-narrow band-pass filter has the advantages of wide-angle scanning, ultra-narrow working bandwidth, ultra-high beam scanning rate and open stop-band suppression, and has very high practical potential in the fields of radar, imaging and the like.

The present disclosure relates to the technical field of communications, and provides a leaky-wave antenna and an antenna system. The leaky-wave antenna comprises: a first dielectric substrate, a first metal layer, a dielectric functional layer, a second metal layer, and a second dielectric substrate. The first metal layer comprises a first transmission line and first radiation units; multiple first notches distributed at intervals are provided on a side edge, parallel to a length direction, on a first plasmon section of the first transmission line; and the multiple first radiation units and the first notches are located on the same side of the first transmission line. In the embodiments of the present disclosure, on the basis of the first plasmon section comprised in the first transmission line, the confinement capability of electromagnetic signals can be enhanced, and the radiation of the electromagnetic signals can be reduced, thereby ensuring the transmission efficiency of the electromagnetic signals, and achieving compact design of leaky-wave antennas. In addition, by radiating antenna signals outward from the first radiation units, high gain of the antenna signals can be ensured while maintaining high transmission efficiency in the first transmission line.

The invention discloses an electrically-controlled beam scanning leaky-wave antenna and communication equipment, belongs to the technical field of antennas, and is used for solving the problems that an existing antenna is complex in structure and the beam scanning angle is limited under a fixed frequency. The electrically controlled beam scanning leaky-wave antenna comprises a gap waveguide and a plurality of radiation units. The gap waveguide comprises a cover plate and a metal bottom plate which are oppositely arranged, and a ridge structure arranged on the upper surface of the metal bottom plate in the transmission direction of the electromagnetic waves, and the gap waveguide is used for transmitting the electromagnetic waves in a traveling wave mode; the plurality of radiation units are sequentially arranged on the cover plate along the extension direction of the ridge structure; each radiation unit comprises a radiation patch, two radiation slots and two electric control switches which are sequentially arranged from top to bottom, and the radiation slots and the electric control switches are distributed in a central symmetry manner relative to the radiation patch; and each electric control switch is used for controlling the working state of the corresponding radiation slot so as to regulate and control the radiation phase of the radiation unit and realize beam scanning.

The invention discloses a full-airspace scanning terahertz leaky-wave antenna and a terahertz radio frequency system, the full-airspace scanning terahertz leaky-wave antenna comprises a feed part, an antenna main body part and an absorption part, and the feed part and the absorption part are connected with two ends of the antenna main body part; the back surface of the feed part is provided with a rectangular waveguide port, the antenna main body part comprises a top radiation layer, a middle transmission line layer and a bottom series feed network layer, the bottom series feed network layer is used for distributing energy among different antenna units, each of the feed part, the antenna main body part and the absorption part comprises ten layers, and each layer is made of copper. The top radiation layer comprises a ninth layer and a tenth layer, and the tenth layer is provided with a leaky-wave antenna array; the middle transmission line layer comprises a third layer to an eighth layer, and the seventh layer and the eighth layer are provided with SSPP transmission lines; the antenna can realize two-dimensional beam scanning of + / -30 degrees within the frequency band of 0.26-0.33 THz, and has high efficiency and a compact structure.

The invention belongs to the technical field of terahertz communication physical layer security, and particularly relates to a terahertz physical layer key generation method based on leaky-wave antenna space-spectrum coupling characteristics. According to the invention, the sensitivity of the effective antenna gain of the leaky-wave antenna to the frequency and the spatial propagation direction is utilized to make up for the defect of low eavesdropping channel doubtful degree caused by lack of small-scale fading in terahertz communication, and the conditional generative adversarial network is designed to accurately speculate the equivalent channel power gain. A physical layer key is generated based on the estimated channel power gain. According to the method, the channel power gain can be accurately estimated from the received signal strength with noise and auxiliary information, the reciprocity of an equivalent channel is enhanced, and the method has a lower key mismatch rate and a higher key generation rate; under the condition of different signal-to-noise ratios, good key generation performance can be kept.

This invention discloses a three-element leaky wave antenna array structure based on a dielectric ridge parallel plate waveguide, comprising: S1, designing a three-element array structure based on the coupling characteristics of the dielectric ridge parallel plate waveguide, wherein the two-port array antenna is fed by probes in parallel; S2, determining the slot design of the three elements according to the pattern product theorem and the relationship between slot size and leakage, thereby designing a scanning beam that meets the requirements of narrow beamwidth and high gain. This invention is a leaky wave antenna array structure with narrow beamwidth and high gain characteristics proposed to meet the requirements of high signal strength and strong anti-interference in long-distance point-to-point communication systems. This antenna can provide better directivity and higher communication quality, while ensuring that the antenna has the advantages of compact structure and small size, thus it can be applied to wireless power transmission systems such as satellite communication systems, radar systems, and the Internet of Things.

The application discloses a variable-beam control method of a variable capacitance diode-based element grating leaky-wave antenna, and comprises the following steps: S1, researching and analyzing an ultra-grating beam conversion mechanism; researching the mechanism of a planar ultra-grating under anisotropic, uniform and continuous periodic boundary conditions; S2, according to the ultra-grating, researching a transmission mode and optimization design of a Floquet-Bloch theorem; researching an FB mode, and eliminating the bad FB mode by designing a tool for ultra-grating parameters; S3, analyzing and designing the ultra-grating leaky-wave antenna; researching the analytical field and current of the synthesized ultra-grating in the framework of the leaky-wave antenna, so as to customize the performance of phase, beam shape and polarization; S4, designing and analyzing an electrically-tuned beam control ultra-grating leaky-wave antenna; the application adopts the variable-beam control method of the variable capacitance diode-based element grating leaky-wave antenna, adopts a simple structure of a tunable material to tune an efficient structure platform, and lays a road for a new generation of efficient special gratings.

This invention provides an artificial surface plasmon full-space beam scanning leaky antenna, comprising a dielectric substrate. The upper and lower surfaces of the dielectric substrate form a top layer and a bottom layer, respectively. The top layer of the dielectric substrate has a balun structure, an artificial surface plasmon strip group, and several metal stubs. Balun structures are symmetrically arranged at both ends of the artificial surface plasmon strip group. Several metal stubs are periodically arranged and symmetrically arranged on the upper and lower sides of the artificial surface plasmon strip group. The artificial surface plasmon strip group includes a pair of slidingly symmetrical artificial surface plasmon strips. This invention enables continuous scanning of the main beam from back-firing to front-firing, possessing full-space beam scanning capability. It has advantages such as small bandwidth occupation, high radiation efficiency, high directivity, high gain, low profile, and relatively small overall size, and can be applied in wireless communication fields such as automotive radar.

To provide an irreversible transmission line having a two-dimensional structure and capable of uniformly distributing an electromagnetic field in a two-dimensional plane.SOLUTION: An irreversible transmission line includes first and second transmission lines that are orthogonal to each other by configuring basic cells having two transmission line portions that are orthogonal to each other and have parallel branch circuits so as to be juxtaposed and cascaded in orthogonal first and second directions. The transmission line part at a position other than an intersection point of the first and second transmission lines is formed of a material magnetized by spontaneous magnetization or the like so as to have gyro anisotropy by being magnetized in a different direction with respect to a propagation direction of a microwave. In a dispersion curve indicating a relationship between an operating frequency of a microwave signal input to each transmission line and a propagation constant of each transmission line, at least one of the parallel branch circuits of each transmission line is configured such that a wave component propagating along each of the parallel branch circuits in a longitudinal direction of each transmission line has an irreversible characteristic and is asymmetrical with respect to the transmission line portion.SELECTED DRAWING: Figure 5

The application relates to the field of wireless communication and sensing technology, and particularly discloses a two-dimensional antenna array multi-beam scanning method based on holographic amplitude weighting, which comprises the following steps: determining the position information of each radiation unit in the two-dimensional antenna array, including calculating the unit spacing and arrangement mode; generating the amplitude weighting value of each radiation unit according to the target wave direction; using the two-dimensional multi-beam holographic amplitude weighting technology, the amplitude weighting value of the radiation unit is determined through the two-dimensional multi-beam holographic amplitude weighting technology; generating the corresponding binary discretization coding sequence based on the amplitude weighting value to control the excitation amplitude of each radiation unit; designing a Ka-band two-dimensional holographic beam scanning leaky-wave antenna square array based on liquid crystals, and the radiation pattern of the two-dimensional antenna array is regulated and controlled through the coding sequence to realize multi-beam scanning.

This invention provides an indoor positioning system and method. A WiFi signal is generated via a WiFi access point. A first leaky-wave antenna converts the received WiFi signal into a first circularly polarized signal and propagates it to a target receiver. A second leaky-wave antenna converts the received WiFi signal into a second circularly polarized signal and propagates it to the target receiver. The second circularly polarized signal is orthogonal to the first circularly polarized signal. The target receiver obtains the target's indoor location information based on the first and second circularly polarized signals. This method eliminates the need for the target to switch between multiple WiFi access points, is less affected by WiFi signal quality, has strong applicability, and provides more accurate positioning.

The application discloses a low-complexity frequency scanning LWA DOA estimation method based on a grouping fusion idea. The main beam direction of a leaky-wave antenna can be changed along with the change of a working frequency, so that the coverage of a radio signal is increased, and the energy consumption of equipment is effectively saved. Meanwhile, the application solves the DOA estimation problem of non-coherent signals and strongly correlated signals which can occur in a real scene. Compared with a traditional DOA estimation method, the method does not need array flow vector to be in a Vandermonde form, the calculation amount is greatly reduced compared with projection and other traditional methods, the required matrix dimension is low, and the implementation steps are simple. The method is not only suitable for single / multi-beam frequency scanning leaky-wave antennas, but also has generalizability for all frequency selection antennas.

The application relates to the technical field of antennas, and provides a reconfigurable leaky-wave antenna and a beam forming method, which comprises a multilayer substrate structure arranged from top to bottom with a top metal layer, a ground metal layer and a bottom metal layer, and a plurality of radiation units arranged along the top microstrip line, a dielectric layer is arranged between adjacent metal layers, each radiation unit comprises a metal radiation structure and a switch arranged on the top metal layer, a control circuit arranged on the bottom metal layer, the metal radiation structure is not connected with the microstrip line, one end of the switch is connected with the metal radiation structure, and the other end is grounded; and the metal radiation structure and the control circuit are connected through a through hole penetrating the opening of the ground metal layer. The application realizes efficient isolation of radio frequency signals and control signals and convenient reconfiguration of the antenna radiation state by arranging the radiation structure and the control circuit on the two sides of the ground metal layer and connecting them through the cross-layer through hole, and the radiation unit is designed by using a single switch, so that the application is small in size, low in cost, simple in structure, and high in anti-interference capability.

The invention discloses a high-dispersion dual-band high-scanning-rate scanning leaky-wave antenna which comprises a dielectric substrate, an upper conductor layer and a lower conductor layer. The upper conductor layer is integrated with an H-shaped high-dispersion electromagnetic structure transmission line and a thin oval unit, the right end of the H-shaped high-dispersion electromagnetic structure transmission line is connected with an upper conductor layer matching network and a plane feeder line structure, and the left end of the H-shaped high-dispersion electromagnetic structure transmission line is connected with an upper conductor layer H-shaped impedance transition section. The right end of the slotted high-dispersion electromagnetic structure transmission line is connected with the lower conductor layer matching network, the trapezoidal impedance matching ground and the metal grounding layer, and the left end of the slotted high-dispersion electromagnetic structure transmission line is connected with the lower conductor layer slot-shaped impedance transition section; the H-shaped high-dispersion electromagnetic structure transmission line and the slotted high-dispersion electromagnetic structure transmission line are coupled through the dielectric substrate to form a double-layer high-dispersion electromagnetic structure transmission line; the antenna has the advantages of dual-band independent control, high radiation efficiency and high scanning rate, and meanwhile, the communication capacity, the real-time sensing performance and the anti-interference performance are improved.

Systems and methods are provided to implement features in the IEEE 802.11ad+ / ay protocols by utilizing combinations of analog and digital precoding (such as hybrid mmWave precoding) to enable multi-stream / multi-user transmissions. These systems and methods are also suitable for 5G wireless networks, such as found in 3GPP. These systems and methods address performing general precoder design, reducing of beam-training overhead with leak wave antennas, performing single-stage approximate precoding with enhanced SLS for SU-MIMO transmissions (eSLS1), performing multi-stage approximate precoding with enhanced SLS for SU-MIMO transmissions (eSLS2), and performing exact precoding with enhanced SLS for SU-MIMO transmissions.

The invention belongs to the technical field of antennas, and discloses an omnidirectional scanning leaky-wave antenna based on a one-way edge mode, which comprises a one-way waveguide formed by sequentially splicing a metal layer, an air layer and a photonic crystal, and the one-way waveguide has the one-way edge mode in an air light cone. Wherein the photonic crystal is formed by embedding periodically arranged square dielectric cylinders in a yttrium iron garnet background, a static magnetic field is applied to the photonic crystal in the z direction, and periodic hollow holes are formed in a metal layer of the one-way waveguide. According to the invention, the structure is simple, the photonic crystal forbidden band is low, and the full-space scanning capability from backward end emission, lateral radiation and forward end emission is realized.

The invention discloses a conformal leaky-wave antenna, and belongs to the technical field of microwave device communication. According to the invention, the problems of insufficient conformal adaptive capability, poor stability, poor beam scanning capability and the like of the conformal leaky-wave antenna are solved. The upper surface of the upper PI substrate is etched by flexible copper foil and is provided with a Vivaldi unit and metal branch knot combined structure periodically distributed on the outer side of an SSPP transmission line in a staggered mode, the lower surface of the lower ABS substrate is completely covered with a metal grounding layer, and a closed guided wave channel is formed. When a radio frequency signal is input from a feed port, electromagnetic waves are spread along the wave guide structure in the PI substrate, directional radiation is realized through energy leakage of periodic metal branch gaps, and meanwhile, the antenna can realize stress-free conformal on a curved surface carrier by utilizing the excellent flexibility characteristic of a PI material; and the periodic design of the radiation structure and the effect of Vivaldi coupling enable the wave beam to realize continuous frequency sweeping from-71 degrees to 42 degrees.

The invention discloses a leaky-wave antenna and communication equipment, and the leaky-wave antenna comprises at least one rectangular waveguide, and the surface of any rectangular waveguide is provided with a plurality of gaps. Each rectangular waveguide comprises a wide wall and a narrow wall which are parallel to the first direction, the gaps in the same rectangular waveguide are located in the same narrow wall, and the gaps in the same rectangular waveguide are arranged in the first direction; wherein the first direction is the propagation direction of electromagnetic waves in the rectangular waveguide. Therefore, the slot in the rectangular waveguide is arranged on the narrow wall, when electromagnetic waves are propagated in the cavity of the rectangular waveguide along the first direction, the electromagnetic waves can be emitted to a specific direction from the slot in the narrow wall, or when external electromagnetic waves pass through the rectangular waveguide, the electromagnetic waves in the specific direction can be received, so that the leaky-wave antenna is obtained. According to the leaky-wave antenna, the distance between adjacent rectangular waveguides can be more flexibly controlled, so that the distance between gaps in different rectangular waveguides is controlled, and the radiation performance of the leaky-wave antenna can be conveniently regulated and controlled.

The technology described herein is directed towards a transceiver with beam scanning capability based on leaky wave antenna technology, which facilitates a compact transceiver design. The leaky wave antenna can be incorporated into a substrate integrated waveguide design, and can include different respective groups of slot pairs having different respective periodicities, corresponding to different respective beam steering directions. The transceiver can thus steer signals to a wearable or portable device that includes a passive metasurface while mitigating null regions; the transceiver transmits a wireless radio frequency signal towards the metasurface integrated into the wearable device, whereby the metasurface reflects an (e.g., metasurface-altered) instance of the incoming signal back to the transceiver. The receipt of the reflected signal can, for example, facilitate proximity detection of the user. The slot pairs can be asymmetrical reflection-canceling slot pairs, to achieve broadside radiation while avoiding band-stop effects.

This invention discloses a design method and structure for a half-mode dielectric ridge parallel plate waveguide dual-beam wide-angle scanning leaky antenna based on PCB technology. Manufactured using a fully printed circuit board process, it includes a core structure of a half-mode dielectric ridge parallel plate waveguide transmission line formed by laminating three dielectric substrates, a metallized via array disposed at the edge of the waveguide's non-radiating open aperture to suppress energy leakage, and a periodic dipole array symmetrically arranged on the radiating open aperture side of the waveguide. This invention solves the technical problems of high manufacturing cost, narrow scanning range, and difficulty in implementing dual beams in traditional leaky antennas, providing a low-cost, high-performance, and easily integrated antenna solution.

The invention discloses a C-band double-inductance circularly polarized leaky-wave antenna, and belongs to the technical field of microwave antennas. The parasitic patch regulates and controls the distribution of an electromagnetic field through the slotting design of the strip-shaped groove. The transmission line is located in the center of the dielectric substrate and keeps a reasonable interval with the parasitic patch to achieve a leaky wave function, and the metal floor serves as a reflecting surface to suppress back lobe radiation and improve forward gain. Through rotation of the strip-shaped groove at a groove angle of + / -10 degrees, left-hand circular polarization is realized in a frequency band of 6.235-6.583 GHz, and right-hand circular polarization is realized in a frequency band of 7.423-7.474 GHz. Meanwhile, by means of collaborative design of a parasitic patch array structure and a transmission line, a full-band S11lt is achieved; -10dB broadband impedance matching is achieved, and a main beam stably points to the vicinity of 22 degrees.