99 results about "Reconfigurable antenna" patented technology

The invention discloses a broadband circularly polarized scattering reconfigurable array antenna based on variable capacitance diode loading, and the broadband circularly polarized scattering reconfigurable array antenna is composed of a plurality of scattering reconfigurable antenna units. The scattering reconfigurable antenna unit comprises a resonance structure used for radiating or receiving signals and a feed and phase shift structure arranged on the lower surface of the resonance structure. The feed and phase shift structure comprises a broadband directional coupler and a reflection type broadband phase shifter. When the scattering reconfigurable antenna unit is in a radiation working state, the broadband directional coupler radiates energy to the resonant structure; when the scattering reconfigurable antenna unit is in a scattering working state, the broadband directional coupler transmits energy to the reflection type broadband phase shifter, and the reflection type broadband phase shifter regulates energy of secondary radiation of the reflection type broadband phase shifter according to bias voltage applied to an internal variable capacitance diode. The array antenna provided by the invention is wide in working frequency band, and the radiation performance can be ensured while the scattering characteristic is reconfigurable.

The invention discloses a pre-phase-based one-bit beam reconfigurable metasurface antenna device, which comprises a pre-phase-based one-bit metasurface antenna unit which is designed by adopting a resonance scattering analysis method, two microstrip line paths with different lengths are switched through a single-pole double-throw switch, so that a 180-degree phase difference of a signal is obtained to realize 1-bit phase regulation and control, and the one-bit beam reconfigurable metasurface antenna device is obtained. Electromagnetic simulation software is utilized to optimize geometric parameters and output reflection electromagnetic response of the design model; the overall design of the reconfigurable antenna array panel is carried out based on the designed unit model, and the reconfigurable antenna array panel comprises a sub-panel composed of a plurality of low-cost microstrip antenna array units and a control panel connected with external feed equipment and a main panel.

The invention relates to a dual-polarization 2bit transmission type metasurface unit working in a Ka wave band, which can realize four-state phase regulation and control of horizontal polarization and vertical polarization on a specified frequency band. And an implementation scheme with a better system integration advantage is provided for the high-frequency multi-polarization reconfigurable antenna system. The unit is composed of two groups of linearly polarized 2bit reconfigurable units which are orthogonally arranged, and each unit is composed of a pair of active receiving antennas at the bottom and a pair of active transmitting antennas at the top; a pair of PIN diodes are respectively integrated in a receiving antenna and a transmitting antenna, and four discrete phase states are realized through combination of switch states, so that 2-bit phase regulation and control are completed. The invention has the following advantages: 1, low transmission amplitude loss and precise phase gradient characteristic are shown in the dual-polarization Ka wave band, and high-precision wave beam regulation and control can be realized; 2, due to the fact that dual-line polarization adopts a synchronous regulation and control mode, the unit can complete phase control only through two feeder lines, and compared with an independent polarization control scheme, the complexity of a feed and bias network is remarkably reduced, so that interference of a bias circuit on electromagnetic radiation characteristics is effectively reduced; and 3, the emergent wave beam of the transmission type metasurface is located on the same side with the transmission type metasurface, so that the shielding of the feed source can be reduced, the interference of a reflection path is avoided, the aperture efficiency is improved, and the sidelobe is reduced.

The invention relates to the technical field of communication, and discloses an antenna and communication equipment. The antenna comprises a feed network, a plurality of phase shift units and a plurality of reconfigurable antenna sub-arrays, wherein the feed network comprises an input end and a plurality of output ends; each phase shifting unit is connected between one output end of the feed network and one reconfigurable antenna sub-array, and the phase shifting units are used for adjusting the phase of a radio frequency signal output by the feed network and then outputting the radio frequency signal to the reconfigurable antenna sub-arrays; the phase shifting unit comprises a first transmission line, a second transmission line and a liquid crystal layer, the liquid crystal layer is arranged between the first transmission line and the second transmission line, the physical length of the first transmission line and the physical length of the second transmission line are L, the guided wave length of the first transmission line and the guided wave length of the second transmission line are lambda g, and L and lambda g meet the condition that L is smaller than or equal to 1 / 4 lambda g; the reconfigurable antenna subarray comprises a plurality of 1-bit antenna units. According to the antenna, the signal transmission loss and the manufacturing cost can be reduced on the premise of improving the performance.

The application provides an AP, an AP deployment system and a method for reducing AP co-frequency interference, and relates to the technical field of communication equipment. The AP comprises a reconfigurable antenna, the reconfigurable antenna has a switchable first polarization direction and a second polarization direction, and the first polarization direction is orthogonal to the second polarization direction. The AP, the AP deployment system and the method for reducing AP co-frequency interference provided by the application switch the polarization direction of the reconfigurable antenna in the AP, so that the polarization directions of the reconfigurable antennas in two APs of the same frequency are orthogonal, and thus the co-frequency interference between the APs is reduced or eliminated.

The invention discloses a center feed four-azimuth wave beam reconfigurable antenna, and belongs to the field of radio frequency front-end devices. The antenna is composed of a straight arm, a crank arm, a central square patch, a capacitor loading ring, a shunt feeder line and a composite beam RF MEMS switch loaded at a fracture on the shunt feeder line, the structures are in central symmetry about a feeding point and respectively cover a 90-degree space range, and the feeding structure is connected with the center of a top patch through a microstrip feeder switching metal column. When the MEMS switch on a certain branch feeder line is switched on, current fed in from the center firstly flows to the straight crank arm radiation unit at the near end of the closed switch through the branch and then flows to the radiation unit at the far end, phase lag of the current at the far end is equivalent to superposition of a binary array, deflected wave beams are generated, the deflection angle can reach 50 degrees, the gain is 4.9 dB, and the wave beam width can reach 120 degrees. The structural design in central symmetry can realize the reconfigurability of wave beams in four directions in a space quadrant.

A pixel-based reconfigurable antenna (PRA) and the method for designing a PRA are disclosed. The PRA supports a total of N fluid antenna system (FAS) ports uniformly distributed across a linear length of Wλ. A physical model is established to connect the correlation of the antenna's reconfigurable radiation patterns with the spatial correlation of physical displacement. A two-step search optimization algorithm is proposed to find the optimized configurations of a pixel layer of the PRA.

The invention provides a near-field feed low-complexity reconfigurable antenna system, which belongs to the technical field of millimeter wave communication antennas and comprises a 1-bit phased array, a waveguide feed horn array and an air gap between the 1-bit phased array and the waveguide feed horn array. The 1-bit unit is composed of two magnetoelectric dipoles, and two diodes are integrated in the receiving unit to achieve 1-bit phase control. According to the 1-bit reconfigurable magnetoelectric dipole phased array disclosed by the invention, one horn mouth surface is used as a near-field feed source of the 2 * 2 magnetoelectric dipole sub-array, so that not only is the uniformity of aperture irradiation ensured through near-field coupling, but also the number of required phase shifters is reduced, and the excitation of the 1-bit reconfigurable magnetoelectric dipole phased array is conveniently realized. The waveguide phase shifter is directly integrated in the horn array antenna, by means of the working phase range wide enough, the phase shifter can effectively achieve phase distribution needed by array near-field feed, and mirror lobes in scanning beams are successfully suppressed. The reconfigurable array antenna is high in aperture efficiency, low in profile and simple in structure, and has the broadband scanning capability.

The present application belongs to the field of unmanned aerial vehicle electromagnetic countermeasures, high-power microwave protection and electromagnetic compatibility reinforcement, and particularly relates to a high-power microwave protection method for unmanned aerial vehicle body, which realizes lightweight global shielding by arranging three layers of gradient frequency selective composite skin on the unmanned aerial vehicle body; micro plasma units are arranged on the body gap, and the whole machine cable is replaced by optical fiber to double block the back door microwave coupling; a reconfigurable antenna, two-stage series limiting and a neural network adaptive filtering three-level radio frequency decoupling link are built on the nose; four groups of broadband sensors are arranged on the body to realize microsecond-level electromagnetic threat perception grading; a flight control closed-loop self-healing regulation system containing a bionic optimization algorithm is constructed, which can dynamically adjust the protection power consumption and automatically redundantly reconstruct the fault. The present application can realize a shielding efficiency of the whole machine of greater than or equal to 40 dB under a 1~18GHz, 20kV / m high field intensity environment, and can balance lightweight, communication signal fidelity and long endurance, effectively avoiding problems such as gap resonance, device breakdown and communication interruption, and is suitable for fixed-wing, vertical take-off and landing low-altitude unmanned aerial vehicles.

This invention relates to a pattern-reconfigurable antenna based on artificial surface plasmon polaritons (SSPPs), belonging to the field of antenna technology. The antenna includes a coplanar waveguide feed line, a transition structure, a reconfigurable SSPP waveguide, and periodic radiating elements. The reconfigurable SSPP waveguide modifies the dispersion characteristics by adding a varactor diode to a traditional SSPP element and adjusting the capacitance value using a bias circuit. The periodic radiating elements are elliptical patches with rectangular slots, coupled to the reconfigurable SSPP waveguide to radiate electromagnetic waves. This invention solves the problems of single radiation direction in traditional antennas and low gain in existing reconfigurable antennas. It achieves fixed-frequency beam scanning (maximum 23°) and frequency beam scanning (maximum 90°) in the 11.5GHz-15GHz frequency band, with gains greater than 9dBi (maximum 11.1dBi), expanding the detection range and increasing the detection distance, making it suitable for fields such as UAV detection.

Embodiments of the present application provide a beam width reconfigurable antenna and a base station, the antenna comprising: a main radiation unit configured to generate a first electromagnetic wave based on a feed network; a plurality of groups of electrically-controlled parasitic units arranged around the main radiation unit and configured to generate a second electromagnetic wave, so that the first electromagnetic wave and the second electromagnetic wave are fused to generate a third electromagnetic wave, and the third electromagnetic wave has adjustable beam width in a horizontal plane and a vertical plane. Through the present application, at least the problem that it is difficult to meet the needs of different communication environments in the related art is solved.

The present invention is a reconfigurable antenna, which includes a total reflection part, a partial reflection part, a partial transmission part, and a radiation part stacked in sequence. A resonant cavity is formed between the partial reflection part and the total reflection part. The radiation part is arranged in the resonant cavity. So that the electromagnetic wave radiated by the radiation part is reflected in the resonant cavity. The electromagnetic wave forms constructive interference during the reflection of the resonant cavity. The resonant cavity makes the electromagnetic wave form the same phase electromagnetic wave and radiation penetrating the reflection part. The partial transmission part is regulated to form beam reconstruction conditions, and the same-phase electromagnetic waves are formed into beams and radiated into space by the beam control conditions.

Disclosed herein are antenna systems, methods, and devices. The device includes a first portion including a first antenna array; and a second portion including a second antenna array, wherein the first portion and the second portion are movable with respect to one another, and wherein the first antenna array and the second antenna array are arranged such that in a first relative position of the first portion and the second portion with respect to one another the first antenna array and the second antenna array operate in combination with one another, and in a second relative position of the first portion and the second portion with respect to one another the first antenna array and the second antenna array operate independently of one another.

The application discloses a low-profile slot type frequency reconfigurable antenna, comprising: a full-metal reflection baffle, an upper layer dielectric substrate and a lower layer dielectric substrate arranged in sequence; the full-metal reflection baffle is located on one side of the upper surface of the upper layer dielectric substrate; the upper surface of the upper layer dielectric substrate is provided with a first metal patch and a second metal patch; the upper surface of the lower layer dielectric substrate is printed with a feeding structure, and the lower surface is printed with two metal ground plates; the two metal ground plates are respectively provided with grooves, two groups of PIN diodes connected with the two grooves are arranged in the grooves, the conduction directions of the two groups of PIN diodes are opposite, and the two metal ground plates are electrically connected with an external single-chip microcomputer through a direct-current feeding line structure. In the application, the PIN diode is used as an electric control element, the response speed is improved, one group of voltages can be used to control the working state of the antenna through the two groups of PIN diodes placed in opposite directions, the complexity of the structure is reduced, the complexity of the control system is reduced, and the cost of the antenna is reduced.

The invention relates to the technical field of wireless communication, and particularly discloses a dual-band directional diagram reconfigurable antenna based on multimode regulation and control and a control method.The antenna comprises a substrate, a radiation unit, a feed unit and a reconfigurable control module, the radiation unit is etched in the center of the surface of the substrate, a first rectangular groove is formed in the center of the radiation unit, and a second rectangular groove is formed in the center of the feed unit; the upper and lower sides of the first rectangular groove are symmetrically provided with second rectangular grooves on the radiation unit, and the tail ends of the second rectangular grooves are provided with circular grooves. The reconfigurable control module comprises a plurality of PIN diodes, a short-circuit pin assembly and a bias circuit, the bias circuit is used for controlling the on and off states of the PIN diodes, one end of each PIN diode is connected with the short-circuit pin assembly, and the other end of each PIN diode is connected with the radiation unit. According to the dual-band directional diagram reconfigurable antenna based on multi-mode regulation and control and the control method, dual-band four-mode work is achieved through a single feed structure, the multi-scene requirements of a wireless body area network are met, the performance is reliable, and integration is easy.

The present application relates to the technical field of communications. Disclosed are an antenna and a communication device. The antenna comprises a feed network, a plurality of phase shift units and a plurality of reconfigurable antenna subarrays, wherein the feed network comprises an input end and a plurality of output ends; each phase shift unit is connected between one output end of the feed network and one reconfigurable antenna subarray; each phase shift unit is used for adjusting the phase of a radio frequency signal outputted by the feed network and then outputting same to one reconfigurable antenna subarray; each phase shift unit comprises a first transmission line, a second transmission line and a liquid crystal layer, the liquid crystal layer being arranged between the first transmission line and the second transmission line, the physical length of the first transmission line and the physical length of the second transmission line both being L, the guided wavelength for the first transmission line and the guided wavelength for the second transmission line both being λg, and L and λg satisfying L≤1 / 4λg; and each reconfigurable antenna subarray comprises a plurality of 1-bit antenna units. The antenna can reduce the signal transmission loss and the manufacturing cost while improving the performance.

The application relates to a polarization reconfigurable antenna based on a substrate integrated waveguide and an artificial surface plasmon, and belongs to the technical field of antennas. The application aims to solve the problems of fixed polarization characteristics of a traditional antenna, low gain of an existing polarization reconfigurable antenna, and limited beam scanning angle of a leaky-wave antenna. The antenna comprises two groups of 45-degree linear polarization antenna units (SSPP units constructed based on a SIW resonant cavity and a periodic 45-degree rectangular slot) arranged orthogonally and a power divider with a 90-degree phase difference. The power divider is selectively driven to work by controlling the switching state of PIN diodes. By controlling the state of the diodes, dynamic switching of +45-degree linear polarization, -45-degree linear polarization and right-handed circular polarization can be realized. Meanwhile, the antenna has high gain (up to 14.7dBi) and a beam scanning capability of about 43 degrees within a frequency range of 11.5-14.5GHz, and is suitable for wireless communication, radar systems and unmanned aerial vehicle detection.

The application discloses a dual-polarized pattern reconfigurable antenna with polarization independent adjustment, and solves the problem that each polarization of a reconfigurable antenna using a single reconfiguration device can only be one-dimensionally scanned through the particularity of a horizontal polarization layer and a vertical polarization layer. Each polarization can be two-dimensionally deflected in an E plane and an H plane, that is, can be deflected up, down, left and right. The reconfigurable antenna controls surface current, and the two polarized antennas are respectively located on the upper and lower surfaces of a dielectric substrate, and the surface current cannot pass through the dielectric, so the control of the two polarizations of the dual-polarized antenna does not affect each other. When the reconfigurable antenna is applied to a base station array antenna, the two polarizations can be simultaneously deflected in different directions, so that a multi-beam antenna can be realized, and different users in different directions can be simultaneously served. On the premise of not increasing the number of array antennas, the communication capacity of the base station antenna is greatly improved. As a pattern reconfigurable antenna, the problem of gain collapse when the array antenna is large-angle scanned can be compensated.

The application discloses a two-bit phase control low-sidelobe super surface antenna, which comprises a rectangular patch antenna as a design principle to realize K-band electromagnetic wave radiation; a path equivalent electric length switching phase shifter and a patch current direction switching phase shifter are combined, the on-off state of a PIN diode in the phase shifter is changed, and 2bit modulation of the radiated electromagnetic wave is realized; a fan-shaped stub is added to a direct current control feeder line of the PIN diode to realize isolation between radio frequency signals and direct current signals; a phase reconfigurable antenna unit is combined with a Chebyshev unequal power distribution network to realize sidelobe suppression effect; a K-band low-sidelobe phase reconfigurable antenna model is combined, electromagnetic simulation software is used to optimize geometric parameters of the K-band low-sidelobe phase reconfigurable antenna model, and radiated electromagnetic responses of the design model are output; and overall antenna design is performed based on the designed unit model.

The application discloses a low-RCS pattern reconfigurable antenna based on OAM multiplexing, and belongs to the electromagnetic technical field; the application integrates a microstrip line array antenna and an embedded polarization conversion metasurface unit, and the microstrip line array antenna is arranged to form a double-circle UCA antenna structure.In terms of radiation performance, the application is based on the OAM multiplexing technology, and by flexibly adjusting the excitation parameters of the inner and outer circle UCA antennas, the dynamic reconfiguration of the radiation beam pattern is effectively realized; in terms of stealth performance, by using the designed embedded polarization conversion metasurface structure, excellent RCS reduction effect can be realized in a wide frequency band range.The application can not only improve the efficiency of modern wireless communication through the efficient dynamic reconfiguration of the beam, but also can maintain the low-RCS characteristics in a wide band to significantly enhance the confidentiality of data transmission, and has the remarkable advantages of novel structure, excellent comprehensive performance, wide applicability and the like, and provides a new technical support for the design of a multifunctional stealth communication antenna.

The invention belongs to the technical field of wireless communication, and particularly relates to a magneto-sensitive-superconducting intelligent flexible reconfigurable antenna and a preparation and control method thereof. The antenna comprises a PI film, a conductor arm and a magnetic sensitive block. The invention designs a magneto-sensitive-superconducting intelligent flexible composite antenna which can be used in an extremely low-temperature environment based on a programming 3D printing technology of a magneto-sensitive intelligent superstructure, a distributed optical fiber sensing technology and excellent electrical characteristics of a superconducting material. According to the invention, through application of non-contact magnetic control intelligent frequency modulation in an extremely low temperature environment (-196 DEG C), antenna shape dynamic reconstruction and working frequency reconstruction and closed-loop regulation are realized, and a brand new solution is provided for a wireless communication system in the extremely low temperature environment.

The invention relates to a pixel antenna multi-objective optimization method based on a BPSO-MLP algorithm, and is applied to the technical field of wireless communication antennas. Global search is carried out in a high-dimensional discrete coding space of a pixel antenna through an improved binary particle swarm optimization algorithm, a dynamic temperature parameter is introduced to adjust the shape of a Sigmoid mapping function, and a probability-driven variation mechanism is adopted to effectively balance exploration and development capabilities; a performance prediction model is established through the designed multilayer perceptron neural network, and rapid and accurate prediction of key performance indexes such as bandwidth, gain and radiation pattern of a candidate antenna structure is realized; and submitting the predicted and screened high-potential solution to full-wave electromagnetic simulation through an intelligent optimization mechanism, feeding back a simulation result to an optimization algorithm, and dynamically updating a prediction model. According to the method, the problems of high-dimensional discrete search, high simulation cost and multi-performance index coordination in pixel antenna multi-target optimization are effectively solved, and an efficient solution is provided for reconfigurable antenna design of a new-generation communication system.

The application relates to a polarized reconfigurable electronic reflector, comprising a receiving antenna array, a transmitting antenna array, a radio frequency integrated array and a controller; the receiving antenna array and / or the transmitting antenna array are polarized reconfigurable antenna arrays; the receiving antenna array comprises a plurality of receiving antennas, the transmitting antenna array comprises a plurality of transmitting antennas, and the radio frequency integrated array comprises a plurality of radio frequency integrated modules; the receiving antennas, the transmitting antennas and the radio frequency integrated modules are in one-to-one correspondence; one receiving antenna is connected with a corresponding radio frequency integrated module through an input wire harness, and the radio frequency integrated module is connected with a corresponding transmitting antenna through an output wire harness; the receiving antennas and the corresponding transmitting antennas satisfy a phase conjugate relationship, and the lengths of the input wire harnesses and the corresponding output wire harnesses are equal; and the controller is connected with each radio frequency integrated module. The application can realize rapid regulation and control of echo polarization information to adapt to the reconfigurable demand of radar target echo polarization characteristics.

This invention discloses a physical layer key generation method and system based on a polarization-reconfigurable antenna, belonging to the field of wireless communication technology. The method includes: establishing a polarization channel model jointly considering polarization correlation, spatial correlation, and channel depolarization effects, and deriving a closed-form expression for the key generation rate; constructing a joint optimization problem of beamforming vector and PRA phase shift vector under base station transmit power constraints and antenna phase modulation constraints, with the goal of maximizing the key generation rate; solving the problem using an alternating optimization method to obtain the optimal beamforming solution based on the Rayleigh quotient and the analytical closed-form solution for polarization phase modulation jointly determined by the polarization channel correlation coefficient, inverse cross-polarization discrimination, and receiver polarization vector. This invention requires no additional RF link, has low hardware complexity, effectively mitigates performance loss caused by polarization mismatch, and significantly improves key generation efficiency and system security in complex polarization environments.

The invention belongs to but is not limited to the technical field of wireless communication antennas, and particularly relates to a mechatronics reconfigurable antenna with a limiting function and a control method thereof, and the mechatronics reconfigurable antenna comprises a reconfigurable reflection array element, a polarization rotation dielectric cylinder, a fixing screw nut, a grounding plate, a stepping motor and a motor control circuit board. The polarized rotating dielectric cylinder is arranged at the upper part of the grounding plate, the lower half part of the polarized rotating dielectric cylinder comprises a groove structure, and the patch antenna is mounted on the upper bottom surface of the polarized rotating dielectric cylinder; the fixing screws and nuts are installed on the upper half part of the grounding plate and are matched with the groove structure. And the motor control circuit board is connected with the motor through a connecting wire. And the side surface boundary of the groove structure is tangent to the side surface of the fixing screw head when being at the zero position of 0 degree or 180 degrees. By optimizing mechanical cooperation of the groove structure and the fixing screw and combining program control logic, accurate zeroing and dynamic regulation and control of the antenna unit are achieved, the problem of error accumulation in the motor driving process is effectively solved, and the beam pointing accuracy and the system stability are improved.

The application provides a terahertz broadband wide-angle pattern reconfigurable antenna, and belongs to the field of radio frequency MEMS. The antenna comprises a tilted beam radiation unit, a tapered balun, a feed network, a MEMS switch network and a voltage bias line group; the feed network comprises one microstrip main feed line and four microstrip branch lines; three voltage bias line groups and one microstrip main feed line are distributed in a cross shape, the outer end of the microstrip main feed line is connected with the tapered balun, and the inner end of the microstrip main feed line is connected with the four microstrip branch lines through a two-stage bifurcation structure; the four tilted beam radiation units are connected with one microstrip branch line respectively; the MEMS switch network comprises three groups of switch structures, and the voltage bias line group at each bifurcation structure is used for controlling the opening and closing of the switch structure at the bifurcation structure, so as to realize the on-off of the corresponding microstrip line in the feed network. The application has the advantages of simple structure, convenient manufacturing, fast manufacturing and integration, and azimuth beam scanning.

The application discloses a dual-frequency dual-port directional diagram reconfigurable antenna loaded with a parasitic structure and relates to the technical field of reconfigurable antennas. The antenna comprises a dielectric substrate, two pairs of printed dipole antennas, a feed network and a parasitic structure. The two pairs of printed dipole antennas are orthogonally arranged on the dielectric substrate and are respectively connected to a feed port one and a feed port two. The feed network comprises a central microstrip feed line and a parallel metal strip line. The parasitic structure is composed of a mixed array of square metal units and isosceles right triangle metal units. Each unit is arranged at equal intervals, the array is symmetrically arranged relative to the printed dipole, and a predetermined coupling interval is maintained between the array and the printed dipole. The application uses two pairs of orthogonally arranged printed dipole antennas for dual-port feeding, realizes azimuth angle plane beam switching, and is flexible in function realization.

The invention discloses a nematic liquid crystal multi-frequency orthogonal reconfigurable antenna array unit, which comprises a multi-frequency radiation patch structure, the multi-frequency radiation patch structure is composed of two nested patches, the two patches are respectively an outer low-frequency radiation patch and an inner high-frequency radiation patch, and electromagnetic isolation between the two patches is realized through an annular gap etched on a dielectric substrate; the regulation and control method comprises the following steps: keeping the amplitude of an input signal of a radio frequency port corresponding to any frequency band unchanged, continuously regulating a liquid crystal dielectric constant through direct-current bias voltage, and changing the resonance characteristic of the frequency band; signals with a 90-degree phase difference are injected into the two radio frequency ports through the orthogonal feed network, and required elliptical polarized waves are formed in a radiation field of the frequency band in combination with phase delay change generated by dielectric constant tuning; the technical contradictions that polarization states of an existing liquid crystal reconfigurable antenna are mutually coupled in a multi-frequency-band working mode, continuous and accurate adjustment of an orthogonal polarization switching mechanism is difficult to achieve, driving voltage is too high, and the structure is complex, so that the profile is increased, and the manufacturing cost is increased are solved.

The application discloses a multi-medium environment-oriented RFID tag adaptive separation system and packaging method, and belongs to the field of radio frequency identification technology.The system is composed of a multi-band reconfigurable antenna array, an embedded environment sensing module, an adaptive impedance tuning circuit and an intelligent control unit, through real-time detection of medium dielectric constant and electromagnetic loss parameters, dynamic adjustment of working frequency and impedance matching state, optimal energy transmission in a multi-medium environment is realized.The packaging method adopts a multi-layer composite structure design, combines a flexible base and gradient dielectric material, optimizes an antenna radiation pattern through three-dimensional electromagnetic field simulation, and introduces an electromagnetic shielding isolation layer to reduce environmental coupling interference.The scheme effectively improves the label recognition rate and communication distance in a complex medium scene, and simultaneously has self-repairing protective coating and low power consumption characteristics, and can be widely applied to the fields of industrial Internet of Things, intelligent logistics and special environment monitoring.

A reconfigurable antenna and a communication device having the reconfigurable antenna include a substrate, a first electrode layer, a second electrode layer, a conductor, two ground wires, and two switches. The substrate has a first surface, a second surface, and a slot penetrating both surfaces. The first electrode layer has a first groove passing through the slot. The second electrode layer has a second groove passing through the slot. The conductor is located within the slot. The two ground wires are located on opposite sides of the first electrode layer. The two switches are located between the first electrode layer and the ground wires. When each switch is connected to its corresponding ground wire, the antenna forms an omnidirectional radiation pattern; when each switch is disconnected from its corresponding ground wire, the antenna forms a directional radiation pattern.