187 results about "Omnidirectional antenna" patented technology

A vertically-polarized omnidirectional antenna, including: a body including: a host printed circuit board (PCB) including: first and second slots, and a metal flooded ground plane, first and second antenna PCBs forming four dipole pairs, the first and second antenna PCBs mounted to the host PCB, respective first to third ground connection fillet tabs, the first and second tabs being on an opposite side of the host PCB from the third tab, the first to third tabs being on a same side of its antenna PCB, an amplitude taper on each antenna PCB at transitions between the host and antenna PCBs, including: a first transmission line splitting off into a second transmission line and a third transmission line, the second transmission line feeding two antennas to form one dipole pair, the third transmission line stepping down using a quarter-wave transformer, and a radio frequency (RF) connector to receive a power supply.

A portable multifunctional AI enabling electronic countermeasure system relates to the technical field of electronic countermeasure, and comprises a host housing, the bottom of the host housing is provided with a tripod, and the surface of the host housing is provided with a plurality of broadband antennas and a reference omnidirectional antenna; a plurality of transceiving front-end assemblies, a receiving front-end assembly and a signal processing unit are arranged in the host shell, the transceiving front-end assemblies are electrically connected with the broadband antennas in a one-to-one correspondence manner, and the reference omnidirectional antenna is electrically connected with the receiving front-end assembly; the plurality of transceiving front-end assemblies and the receiving front-end assembly are electrically connected with the signal processing unit; the signal processing unit is used for processing the radio frequency signals output by the plurality of transceiving front-end assemblies and the receiving front-end assembly by adopting an AI algorithm model to generate corresponding interference signals, and the interference signals are sent to the broadband antenna through the plurality of transceiving front-end assemblies; the method is used for solving the problems of weak interference capability and slow deployment speed in the prior art.

Omni-directional, horizontally polarized antennas are provided. According to one aspect, an omni-directional, horizontally polarized antenna includes a first reflector and a second reflector separated from the first reflector. Disposed between the first and second reflectors are a planar array of radially directed horizontally polarized antenna elements and a planar feed network configured to feed the antenna elements of the planar array. A coaxial feed structure configured to communicate electrical signals to or from the feed network is provided.

A horizontally-polarized omnidirectional antenna, including: a body including: a host printed circuit board (PCB) including: a metal-flooded ground plane, windows, and an interconnect providing a radio frequency (RF) signal splitting off into 2*Z0 transmission lines, a plurality of antenna elements, corresponding to respective windows, including: an antenna PCB including an antenna slot having a pullback region with the host PCB therein without directly contacting the pullback region, the window in the antenna slot, loops of conducting strips at top and bottom sides of the antenna PCB, slightly overlapping to form capacitive elements at overlap regions, a pair of input solder joints at respective input conducting strips on the top of the antenna PCB, on opposite sides of the window, a transmission feed solder joint directly between the pair of input solder joints across the window, connected to a Z0 feed line, and an RF connector receiving an antenna power supply.

The invention belongs to the technical field of radio frequency thunder and lightning positioning, and particularly discloses a wind turbine generator lightning arresting detection method based on radio frequency electromagnetic detection. According to the invention, the initial layout of the directional antenna is planned through the signal-to-noise ratio, the elevation angle and the number of stations in a constrained manner, thereby overcoming the defects that the omnidirectional antenna is low in signal-to-noise ratio and is liable to be interfered in a wind power plant, and achieving the selective focusing of a target airspace and the collection of high-signal-to-noise-ratio data. And station distribution parameters are iteratively optimized by simulating lightning signals, so that the capability of monitoring lightning stroke areas of key components of the fan is enhanced. Time parameters are accurately extracted by using the high gain characteristic of the directional antenna, and high-precision measurement of the time difference of arrival is ensured in combination with a unified time base alignment technology. Finally, a high-resolution three-dimensional lightning stroke channel form is inversely generated based on a spherical propagation model, the problem of detection interference in a complex environment of a wind power plant is systematically solved, and an accurate three-dimensional observation basis is provided for lightning stroke protection design and accident analysis.

The utility model discloses an antenna performance testing device, which belongs to the technical field of unmanned aerial vehicle testing equipment, and comprises a device main body, the device main body comprises a fixing part, a mounting part and an electric drive steering engine, and the mounting part comprises a mounting plate and a mounting nut; the fastening structure comprises a fastening block, a mounting cylinder, a rotating disc, a worm gear ring and a rotating worm, the mounting cylinder is provided with a sliding groove, and the rotating disc is provided with a moving groove; according to the utility model, through the arrangement of the fastening structure, a user places one end part, with a threaded hole, of the omnidirectional antenna among a plurality of fastening blocks, and the worm is rotated to rotate around the axial direction of the worm so as to drive the rotating disc which is coaxially installed with the worm gear ring to rotate, so that the plurality of fastening blocks move towards the direction close to the circle center of the rotating disc at the same time; and until the circumferential end surfaces of the plurality of fastening blocks are in contact with the circumferential side wall of the omnidirectional antenna, the axial direction of the omnidirectional antenna coincides with the axial direction of the mounting nut, so that the fastening force between the omnidirectional antenna and the mounting nut is ensured to be uniformly distributed.

The utility model discloses an omnidirectional antenna, which comprises a support block and a plurality of double-cone units which are arranged in the support block at intervals, and a four-power divider is arranged at one end of the support block; the double-cone unit comprises an upper vibrator and a lower vibrator, necking ends of the upper vibrator and the lower vibrator are oppositely arranged, the upper vibrator and the lower vibrator are riveted on the supporting block, a cable locking structure is arranged on the lower vibrator, and a conductive tank spring is embedded in the upper vibrator; the antenna further comprises a feed cable sequentially penetrating through the upper oscillator and the lower oscillator, the cable locking structure is used for locking the feed cable, and the conductive tank spring is used for being inserted into an inner conductor of the feed cable. The feed cable is connected with the four power dividers; the four-way power divider also comprises a protective housing. The supporting block and the four-way power divider are both installed in the protective housing. The antenna has good consistency in antenna indexes such as out-of-roundness, standing wave, gain and the like.

The application relates to the field of antennas and discloses an ultra-wideband omnidirectional antenna and a detection device. The ultra-wideband omnidirectional antenna comprises a conical conductive structure, a grounding conductive structure, a feeding structure and a signal reflection structure. The grounding conductive structure comprises a connecting surface. The top end of the conical conductive structure is connected to the connecting surface of the grounding conductive structure, and the axis of the conical conductive structure is perpendicular to the end surface of the grounding conductive structure. The grounding conductive structure comprises a high-frequency signal end and a low-frequency signal end. The distance from the high-frequency signal end to the top end of the conical conductive structure is smaller than the distance from the low-frequency signal end to the top end of the conical conductive structure. The feeding structure is electrically connected to the top end of the conical conductive structure. The signal reflection structure is connected to the end surface of the grounding conductive structure where the grounding conductive structure is connected to the conical conductive structure, and the signal reflection structure is arranged between the high-frequency signal end and the top end of the conical conductive structure. Through the arrangement, the ultra-wideband omnidirectional antenna can generate gain for radio signals of a lower frequency.

The utility model relates to the antenna technology, and provides a combined antenna device and electronic equipment, the combined antenna device comprises a metal bottom plate, a metal surrounding edge, a directional antenna, an omnidirectional antenna, a power divider, a change-over switch and a radio frequency input interface, the omnidirectional antenna is fixed on the outer side of the metal surrounding edge, the metal surrounding edge is reasonably used as the metal ground of the omnidirectional antenna, and the radio frequency input interface is arranged on the metal surrounding edge. A directional antenna and an omnidirectional antenna are integrated, and the two antennas are ensured to work in a time-sharing manner and do not influence each other by controlling the switching-on and switching-off of the change-over switch; the omni-directional antenna is small in occupied area, size and weight and does not affect installation of the directional antenna, and compared with an existing combined antenna product, the omni-directional antenna is small in size, low in cost and convenient to switch and has great practical use value.

The invention relates to the technical field of unmanned aerial vehicle detection, and discloses an unmanned aerial vehicle direction finding method, an unmanned aerial vehicle direction finding device, electronic equipment and a computer readable storage medium, the method is applied to the electronic equipment, the electronic equipment comprises an omnidirectional antenna and a directional antenna, and the method comprises the following steps: controlling the omnidirectional antenna and the directional antenna to scan a target area in a surrounding manner, obtaining a first power value sequence and a second power value sequence, determining a ratio of the second power value sequence corresponding to each azimuth angle to the first power value sequence, determining the azimuth angle corresponding to the maximum ratio as a first angle, and performing convolution operation on the second power value sequence and a preset power value sequence corresponding to the directional antenna to obtain a second power value sequence corresponding to the directional antenna; and determining the azimuth angle corresponding to the maximum convolution value in the convolution value sequence as a second angle, and if the error between the first angle and the second angle is smaller than a preset error, determining the second angle as a target angle of the unmanned aerial vehicle relative to the electronic equipment. In this way, the credibility and accuracy of the direction finding result are improved.

This invention discloses a miniaturized broadband omnidirectional antenna, comprising a base plate and a grounding arm, a first radiating element, a second radiating element, a third radiating element, and a fourth radiating element disposed on the same side of the base plate. The first radiating element is spaced apart from the base plate and connected to the base plate via the grounding arm. The second, third, and fourth radiating elements are all located between the first radiating element and the base plate. The second radiating element is connected to both the first and third radiating elements, and the fourth radiating element is connected to the third radiating element. This miniaturized broadband omnidirectional antenna has a simple structure, is integrally molded, and is securely installed. It achieves miniaturization, broadband, and omnidirectional characteristics, with an operating frequency coverage of 2.3 GHz to 5.85 GHz, a VSWR below 1.8, and a bandwidth of 87%.

The application relates to the technical field of signal shielding devices, in particular to a portable multi-frequency-band shielding device which comprises a device main body, a first shielding unit and a second shielding unit. The first shielding unit is provided with a first antenna module, and the second shielding unit is provided with a second antenna module. The first antenna module is configured as an omnidirectional antenna, so that the shielding device meets the demand of shielding signals of various wireless devices; the second antenna module is configured as a directional antenna, so that the shielding device meets the demand of shielding signals of specific wireless devices; the first antenna module is installed outside the device main body, and the second antenna module is installed inside the device main body, so that the shielding effect of the shielding device on different signals is improved. In this way, the shielding function of the shielding device meets the expected requirement.

The present application relates to the field of communication radar, in particular to a kind of omnidirectional correlation interferometer real-time direction finding method and system based on spread spectrum signal;Construct omnidirectional antenna array;Utilize radio frequency channel time-sharing switching and receive the array signal of single array plane currently working, obtain baseband signal;A set of fixed base line is distributed to the uniform circular array in the array plane currently working;Based on the pseudo-random code matching the spread spectrum signal generated locally and received, each way of baseband signal is carried out correlation despreading, and the phase difference corresponding to each base line is obtained;The phase difference obtained is input into the phase difference sample library established in advance to carry out matching, calculates similarity function, and the angle stored in the phase difference sample library corresponding to the maximum value of similarity function is determined as the measurement direction angle;The measurement direction angle is carried out data processing, and the optimized measurement direction angle is obtained;The method of the present application has the advantages of full-space coverage, low cost, direction finding precision and tracking precision.

This invention relates to the field of electromagnetic environment spectrum monitoring, specifically to an electromagnetic environment spectrum monitoring system for a communication terminal area. It includes a remote monitoring device, a monitoring receiver, and an omnidirectional antenna. The monitoring receiver is connected to the communication terminal under test, and the omnidirectional antenna is connected to the hardware interface of the monitoring receiver to receive regional environmental electromagnetic wave signals. The remote monitoring device communicates with the monitoring receiver. The input signals are the uplink and downlink carrier signals of the communication terminal, and the regional environmental electromagnetic wave signals. The input signals undergo down-conversion and analog-to-digital conversion in a conditioning circuit before being input to the monitoring receiver. The radio frequency module uniformly traverses and collects the spectrum of the monitoring frequency band signal by setting a scanning bandwidth. The monitoring receiver converts the collected time-domain signals into spectrum data, splices multiple data segments into a complete frame according to a specified format, and uploads the spectrum data to the remote monitoring device for display. This invention is applicable to electromagnetic environment spectrum monitoring.

The invention relates to the technical field of wireless communication, in particular to a very high frequency omnidirectional antenna array blind area optimization method based on directional antenna supplement, which comprises the following steps of: establishing a very high frequency omnidirectional antenna unit model, and executing free space simulation; constructing at least one directional antenna precise model; constructing a very high frequency reference omnidirectional antenna array model based on an erected base; and simulating the reference model, obtaining an initial radiation pattern, and identifying and recording the orientation and range of the communication blind area. According to the invention, the number and spacing of the directional antennas are optimized through parameterized scanning, the communication blind area of the very high frequency omnidirectional antenna array is accurately eliminated, and the communication reliability is improved; a complete reusable design process is established, the erection of a base model is simplified, and the simulation time and the engineering cost are reduced; a parameter interval in a limited space is defined, and the engineering operability is enhanced; a single / double directional antenna supplement scheme library is formed, different blind areas and resource scenes are adapted, and the practicability is high.

The invention relates to the technical field of wireless communication, and discloses a beamforming method suitable for a lift-off base station in order to solve the problem that the coverage range of 5G signals is small due to the fact that an omnidirectional antenna is adopted by current 5G lift-off base station equipment, the beamforming method is applied to the lift-off base station, an antenna array of the lift-off base station is in a mode of N antennas, and the antenna array of the lift-off base station is N antennas. The method comprises the steps that a wave control code table of an antenna array is generated, M directional beams are synthesized on an azimuth plane according to the antenna array and the wave control code table, and each directional beam corresponds to a group of wave control codes; the method comprises the following steps: after a terminal accesses a network provided by a lift-off base station, acquiring an SRS time domain signal transmitted by the terminal; the SRS time domain signal is the product of SRS time domain signal sample points on the N antennas; outputting a target beam direction sequence number through a beam detection algorithm according to the beam control code table and the SRS time domain signal; and performing beam forming on the downlink transmission signal according to the target beam direction sequence number. By adopting the method, the coverage range of 5G signals can be expanded, and the signal receiving quality of the terminal is enhanced.

The application relates to a radiation patch, which comprises a metal sheet and first and third grooves arranged on the metal sheet; a plurality of the first grooves are arranged in a ring array, the first grooves are semicircular structures, and the straight ends of the first grooves are communicated through a ring-shaped second groove; a plurality of the third grooves are arranged in a ring array, one end of each third groove points to the center of the second groove, and the other end is communicated with the inner ring of the second groove; each first groove is tangent to the outer ring of the second groove; the metal sheet is further provided with a plurality of fourth grooves arranged in a ring array, and the fourth grooves correspond to the first grooves one by one; one end of each fourth groove is communicated with the straight end of the corresponding first groove, and the other end is communicated with the outer ring of the second groove; two adjacent third grooves are further communicated through a fifth groove, and the fifth grooves are sequentially communicated to form a ring-shaped groove. The application can expand the bandwidth of an antenna, improve the omnidirectionality of the antenna and reduce the size of the antenna.

Examples are provided that relate to satellites utilizing both a narrowband communication channel and a broadband communication channel. One example provides a satellite comprising narrowband communication hardware configured to communicate on a control plane over a narrowband communication channel using an omnidirectional antenna. The satellite further comprises broadband communication hardware configured to communicate on a data plane over a broadband communication channel using a beamforming antenna.

The invention discloses an omnidirectional beam antenna array and a low-altitude aircraft. The omnidirectional beam antenna array comprises a reflecting plate, a plurality of first antenna units and a plurality of coaxial cables, the reflecting plate is provided with a first axis A and a second axis B; the first antenna unit is arranged on the front surface of the reflecting plate and is symmetrical about the first axis A and the second axis B; an outer conductor of the coaxial cable is connected with the reflecting plate; wire cores are connected with the first antenna units in a one-to-one correspondence manner; through the above structure, the omnidirectional beam antenna array has the advantages of high gain, low out-of-roundness and low profile, has high applicability, and can realize array layout under various antenna structures or various requirements for both omnidirectional antenna units and non-omnidirectional antenna units, thereby being popularized to various use scenes.

To provide a management system and a method capable of surely and more simply grasping a state of a pneumatic fender holding water inside while avoiding severe restriction of radio communication.SOLUTION: Performing wireless communication based on a predetermined LPWA communication standard between the transmitting and receiving terminal 7 and the relay device 7b with the watertight housing vessel 3 housing the sensor 2, the transmitting and receiving terminal 7, and the battery 8 floating on the water held inside the pneumatic fender 13, with the battery 8 serving as an eccentric member maintained at a position of a lower end portion of the housing vessel 3, and with the non-directional antenna 9A maintained at a position of an upper end portion of the housing vessel 3; Sensing data by a sensor 2 are transmitted from a transmitting / receiving machine 7 to a relay machine 7b by a transmitting non-directional antenna 9A and transmitted to a communication network 11 through the relay machine 9A, and management indexes based on the sensing data are displayed on specific terminals 10 connected to the communication network 11.SELECTED DRAWING: Figure 1

This invention discloses a dual-substrate circularly polarized reconfigurable omnidirectional antenna based on PIN diode control. The antenna comprises a first substrate and a second substrate. The second substrate has a ground plane printed on it, and the first substrate has a radiating patch printed on it. The radiating patch includes a central square patch, a Γ-shaped stub, a loop antenna, PIN diodes, and via shorting posts. Seamless switching between left-hand and right-hand circular polarization is achieved through the on / off combinations of 16 PIN diodes, with a simple switching logic. High polarization purity is achieved in both polarization modes, and the via shorting posts effectively reduce mutual interference between modes, resulting in strong switching reliability. In both circular polarization modes, the relative impedance bandwidth and axial ratio bandwidth are wide. In the left-hand circular polarization mode, the relative impedance bandwidth reaches 19.38%, covering 2.33-2.83GHz with |S11|<-10dB, and the axial ratio bandwidth reaches 26.3%, covering 2.08-2.71GHz with AR<3dB. In the right-hand circular polarization mode, the relative impedance bandwidth reaches 19.8%, covering 2.32-2.83GHz with |S11|<-10dB, and the axial ratio bandwidth reaches 23.43%, covering 2.11-2.67GHz with AR<3dB, which is significantly better than existing narrowband designs of the same type.

A community wind turbine cellular system (CWTC system) is disclosed. The CWTC system is configured to provide community-based cellular communication, on a temporary or permanent basis. One or more turbine blades of the CWTC system are configured with an omni-directional radio frequency (RF) antenna suitable for receiving and transmitting mobile communication data to cellular devices. These omni-directional RF antenna have an uninterrupted wired connection that passes from the antenna to an antenna radio within the system's nacelle. More particularly, each RF antenna in a turbine blade is connected, via a wired connection, to a corresponding slip ring within the nacelle of the cellular wind turbine. Each slip ring is connected to the antenna radio via a wired connection. In this manner, each RF antenna maintains a wired connection to the antenna radio, even as the turbine blades are rotating.

The invention relates to a base station antenna. The base station antenna comprises an antenna housing; the X antenna arrays are configured to be annularly distributed along the inner wall of the antenna housing, and X is larger than or equal to 2; and a feed network configured to have N radio frequency (RF) ports and X feed ports connected to the X antenna arrays, and N < = X. Wherein the feed network comprises a plurality of power dividers and at least one 90-degree hybrid coupler connected to the N RF ports. Wherein the phase difference among the X antenna arrays is set by arranging the connection relationship between the X antenna arrays and the feed network, so as to realize the quasi-omnidirectional antenna pattern.

The present invention relates to the field of wireless telecommunication and discloses a compact, high-performance, dual-polarized, quasi-omnidirectional Multiple-Input Multiple-Output (MIMO) antenna system for small cell wireless communications. It develops a flexible platform to realize different arrangements of antenna modules for different applications for 3G, 4G, and 5G wireless systems. It includes multi-band dual-polarized antenna arrays operating at 696 MHz-960 MHz, 1695 MHz-2700 MHz, 3300 MHz-4200 MHZ, 5150 MHz-5925 MHz, high gain antenna array modules, feeding networks, power dividers, reflectors, and a radome. The invention adopts a dual-polarized MIMO antenna structure with multiple radiating antenna arrays with high isolation between radiating elements to achieve compact size, good standing wave ratio, high gain, wide operating frequency range, quasi-omnidirectional antenna pattern, and spatial diversity with less interference. In addition, the antenna structure is fully customizable, highly reliable and durable, easy to manufacture, and easy to deploy in the field.

The low-profile dual-polarized omnidirectional full-duplex antenna comprises a vertical omnidirectional antenna unit, a horizontal omnidirectional antenna unit and a second horizontal dielectric substrate, wherein a metal floor is printed on the lower surface of the second horizontal dielectric substrate; a first radiation arm and a second radiation arm which are connected through metalized via holes are printed on two plate surfaces of two crossed dielectric substrates in the vertical omnidirectional antenna unit respectively; a plurality of rectangular grooves which are arranged in a radial manner are etched in the metal floor; the horizontal omnidirectional antenna unit is connected with the metal floor through four metal columns. The four metal columns can enable coupling current generated by the vertical omnidirectional antenna unit to the horizontal omnidirectional antenna unit to be short-circuited to the metal floor, the electrical length of the vertical omnidirectional antenna unit is increased, meanwhile, a plurality of rectangular grooves which are formed in the metal floor in a radioactive mode are etched, radial surface current can be blocked, and the coupling current is reduced. Omnidirectivity of the horizontal antenna is guaranteed, the profile height of the antenna is reduced, and the radiation arms on the two surfaces of the two vertical dielectric substrates improve isolation between antenna ports.

An omnidirectional antenna, relating to the field of communication antenna technology, includes a support, a tapered radiating cone, a feed line, and a radome. The support is constructed from a molded substrate, with the antenna body integrally molded with the ground plane, resulting in a compact structure requiring no additional assembly. The tapered radiating cone is mounted on the support, comprising a lower cone structure and an upper tapered structure. The cone structure expands the bandwidth, while the tapered structure reduces the antenna size. The feed line connects to the tapered radiating cone for signal transmission. The radome covers the exterior of the support for enhanced protection. Laser engraving is used to etch the tapered radiating cone's circuitry onto the inner surface of the support, achieving precise forming of the conductive lines and eliminating the need for soldering. Its advantages include: expanded operating bandwidth and stable VSWR, supporting ultra-wideband communication; miniaturization and low profile of the support; integrated design eliminating assembly processes, improving product consistency and yield; and laser engraving reducing manufacturing costs, making it suitable for integration into smart devices.

This invention proposes a power allocation method for a non-cooperative game-based cognitive wireless network for energy harvesting, comprising the following steps: Step S1: During a time interval of τT within a time slot T, the primary user transmitter PT transmits data to the primary user receiver PR via an antenna, and each secondary user receiver SU is equipped with an omnidirectional antenna for energy harvesting to collect energy from the PU radio frequency signal; Step S2: During the data transmission process of a time interval of (1-τ)T within a time slot T, a defined minimum signal-to-noise ratio threshold and an interference power threshold I for PU are set; Step S3: During the time interval of (1-τ)T within a time slot T, SU... i (i = 1, 2, ..., n) Power allocation is performed through a non-cooperative game; Step S4: Solve for SU within a time interval (1 - τ)T of a time slot T. i The utility function (i = 1, 2, ..., n) eventually reaches Nash equilibrium, maximizing the throughput of secondary users and the revenue of primary and secondary users. This invention improves the throughput and revenue of secondary users by finding the optimal power allocation strategy in energy harvesting cognitive radio networks while satisfying all constraints.

The invention discloses a UWB positioning device based on a six-unit array antenna, and relates to the technical field of wireless positioning, the UWB positioning device comprises a lower base, an antenna calibration plate, six miniaturized omnidirectional antennas and an upper cover protective cover, the lower base is connected with a network power line; the lower base is internally provided with an MCU algorithm processing module, a UWB positioning chip module, a power supply module and a network communication module, according to the design, through innovative antenna layout, an optimized signal processing algorithm and a built-in antenna calibration board, the problems that in the prior art, the deployment cost of multiple base stations is high, the positioning precision of a single base station is low, and the anti-interference capability is weak are solved; the single-base-station high-precision two-dimensional or three-dimensional positioning method is suitable for indoor and outdoor high-precision positioning scenes, and has the advantages of high positioning precision, strong anti-interference capability, long coverage distance and the like.

The utility model discloses a blind-mating integrated ultra-wideband omnidirectional active antenna, and belongs to the technical field of radio communication and radio spectrum monitoring. In terms of hardware, all-directional antennas of 30 MHz to 1.3 GHz, 1.3 GHz to 8 GHz and 8 GHz to 26.5 GHz and low-noise amplifiers of corresponding frequency bands are designed in an integrated mode, and an integrated blind-mating connector is adopted for external connection. The receiving frequency range of the antenna covers 30 MHz to 26.5 GHz, and compared with a traditional antenna design, the size of the antenna is reduced, and the receiving frequency range is expanded at the same time.