473 results about "Antenna radiation" patented technology

The invention provides a wide-angle scanning dual-circularly-polarized phased-array antenna unit, which belongs to the field of dual-circularly-polarized antennas and comprises a first dielectric layer, a second dielectric layer and a third dielectric layer which are sequentially stacked, the antenna radiator is arranged on the side, away from the second dielectric layer, of the first dielectric layer, the antenna radiator comprises four radiation patches, each radiation patch comprises a metal patch and a loading branch knot, and each metal patch is provided with a slotted structure; the first metal ground layer is clamped between the first dielectric layer and the second dielectric layer, and a cross coupling gap and a first coupling gap and a second coupling gap which are perpendicular to each other are formed in the first metal ground layer; the U-shaped feeder line is clamped between the second dielectric layer and the third dielectric layer, and two ends of the U-shaped feeder line are respectively connected with a coaxial feed column penetrating through the third dielectric layer; the second metal ground layer is arranged on the side, away from the second dielectric layer, of the third dielectric layer; an array is also provided; the problem that a traditional circularly polarized antenna is narrow in impedance bandwidth and limited in polarization is solved.

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 application provides an angle of arrival measurement method, an electronic device, a readable storage medium and a chip, and relates to the technical field of wireless positioning. The method is applied to an electronic device, and the electronic device comprises a first antenna and a second antenna. The antenna radiation field patterns of the first antenna and the second antenna are similar within a first angle range around the electronic device and are not similar within a second angle range around the electronic device. The method comprises the following steps: determining the difference between target parameters measured by the first antenna and the second antenna according to a wireless signal; determining the angle of arrival range of the wireless signal according to the difference; wherein the angle of arrival range is the first angle range or the second angle range; and measuring the angle of arrival of the wireless signal by using the first antenna and the second antenna according to the angle of arrival range. The technical scheme provided in the embodiment can improve the accuracy of angle of arrival measurement.

The invention discloses a broadband dual-circularly-polarized low-cost phased-array antenna array element, which comprises an antenna radiation structure and a slot feed structure which are arranged independently from each other, and is characterized in that the antenna radiation structure comprises a parasitic radiation layer, a first dielectric substrate, an excitation radiation layer and a second dielectric substrate which are arranged in a laminated manner; the slot feed structure comprises a slot layer, a third dielectric substrate, a strip-shaped transmission line and a fourth dielectric substrate; the antenna layer structure and the slot feed structure realize electromagnetic coupling transmission through the slot layer; a hollow symmetrical structure is arranged in the middle of the first dielectric substrate, and the hollow part is used as an air medium to reduce dielectric loss; the gap layer is provided with a multidirectional coupling gap structure; the strip-shaped transmission line is provided with at least two feed ports, and dual circularly polarized radiation is formed in the antenna layer structure through excitation of different feed ports. The antenna radiation layer has no metal through hole or blind hole, can be processed in a layered manner, has the advantages of low processing cost and high yield, and ensures impedance bandwidth while realizing dual circular polarization.

The invention relates to an unmanned ship dynamic channel modeling method in an offshore water surface environment, and the method comprises the steps: constructing a three-dimensional offshore water surface simulation scene which comprises a sea surface, a wharf facility, an unmanned ship cluster and a communication node; establishing a wireless channel propagation model based on a ray tracing method, and simulating a propagation mechanism of direct, reflection and diffraction paths; establishing a motion characteristic model of the unmanned ship under the action of waves, and obtaining six-degree-of-freedom pose data of the unmanned ship; generating multiple frames of scene copies in batches by adopting an intelligent batch processing dynamic reconstruction method; dynamically correcting an antenna pattern in each frame of scene copy according to the pose data so as to couple the influence of hull motion on antenna radiation characteristics; importing the corrected antenna pattern into the wireless channel propagation model to generate a dynamic channel response; simulation is executed, and channel data obtained through simulation are collected and analyzed. According to the method, the motion characteristics of the unmanned ship in waves and the wireless channel propagation mechanism can be accurately coupled, and the accuracy of dynamic channel prediction is improved.

The application discloses a large-scale plane one-way folding array antenna full-working-condition electric performance prediction method, which comprises the following steps: (1) determining a folding position according to a folding angle under different working conditions; (2) determining an array element position after folding according to the folding position and array antenna geometric parameters; and (3) determining a mode excitation coefficient according to each array element position information and single array element mode information, and then calculating electric performance under different working conditions. The application can quickly and accurately analyze folding array antenna radiation and scattering, and has important engineering significance for array antenna analysis and design.

The invention relates to the technical field of communication control, and provides a total radiator antenna applied to a wearable device and the wearable device, the total radiator antenna comprises a metal frame radiator, a feeding point, a ground feeding point and a radio frequency front end module; the metal frame radiator has no physical breaking joint and is configured as a frame structure of the wearable device; the at least four feeding points are distributed along the circumferential direction of the metal frame radiator and respectively correspond to signal excitation of different frequencies; the at least four ground feeding points are distributed along the circumferential direction of the metal frame radiator and are alternately arranged with the feeding points, and each ground feeding point is selectively grounded through a switchable filter circuit; and the radio frequency front end module is connected with the feeding point through an antenna switch and is configured to control the cooperative working state of the feeding point and the ground feeding point so as to realize radiation and reception of multi-band signals. According to the invention, under the condition of breaking through the physical size limitation of wearable small-size equipment, the performance target of antenna radiation of different frequency bands can be realized.

The invention provides an integrated antenna integrating Beidou, low-orbit and Tiantong satellite communication and high-precision navigation positioning. A low-orbit satellite microstrip antenna, a GNSS high-precision microstrip antenna, a Tiantong microstrip antenna and a Beidou short message microstrip antenna are sequentially stacked on the upper surface of a PCB in a conical mode. A shielding cover is arranged on the lower side of the PCB; antenna radiation patches of the low-orbit satellite microstrip antenna are arranged on the outer edges of the upper surface and the lower surface of the low-orbit satellite antenna substrate and are not covered by the GNSS high-precision microstrip antenna; circuits of the low-orbit satellite microstrip antenna and the sky-pass microstrip antenna are arranged on the upper surface of the PCB circuit substrate. And circuits of the GNSS high-precision microstrip antenna and the Beidou short message microstrip antenna are arranged on the lower surface of the PCB. According to the invention, the four-in-one combined design of the antenna, the low-orbit satellite antenna, the Beidou short message antenna and the high-precision navigation antenna is adopted, so that the problem of performance insufficiency when each antenna is used independently is solved, complementation among the antenna, the low-orbit satellite antenna, the Beidou short message antenna and the high-precision navigation antenna is realized, and the cost is reduced; the electromagnetic compatibility between the antennas is improved through frequency band and polarization isolation design, and the stability of a communication link is guaranteed through interference resistance of the peripheral low-orbit satellite antenna.

The invention relates to the technical field of mobile phone antennas, in particular to a mobile phone antenna and electronic equipment for exciting a floor characteristic mode based on a shunt feed technology, and the mobile phone antenna comprises a dielectric substrate, an antenna radiation metal patch on the outer side of the dielectric substrate, a metal floor arranged below the dielectric substrate, a low-frequency inverted-F antenna and a power divider, a first low-frequency feed port and a second low-frequency feed port are respectively arranged on corresponding radiation patches on two sides of the metal floor, and the two feed ports are simultaneously and electrically connected with an output end of the power divider through feeder lines, so that parallel feed of the low-frequency inverted-F antenna is realized, low-frequency characteristic modes of two long sides of the metal floor are simultaneously excited, and the low-frequency inverted-F antenna is formed. The low-frequency-band radiation efficiency is improved, the working bandwidth is expanded, and integration with a radio frequency circuit of the whole mobile phone can be completed only through a single excitation source.

The invention provides a low-profile circularly polarized antenna unit for slot coupling feed and an array thereof, and the antenna unit employs a plurality of metal layers which are coaxially arranged, are sequentially stacked up and down and are separated through dielectric layers, thereby achieving the high integration of a feed network, a coupling structure and a radiation unit in the vertical direction of the antenna unit. Specifically, the parasitic patch and the radiation patch which are stacked and coupled up and down are adopted, so that the working bandwidth of the antenna unit is expanded; furthermore, the interference of a feed network on the radiation performance of the antenna is reduced through the separation of the upper metal ground and the lower metal ground, and meanwhile, two orthogonally distributed gap structures formed in the upper metal ground are matched with the microstrip transmission line to perform coupling feed, so that the circular polarization performance of the antenna unit is improved; in addition, periodically arranged metallized shielding through holes are formed in the edges of the antenna units, so that surface wave propagation and electromagnetic coupling between the units are effectively inhibited, and the performance stability of the antenna unit during large-angle scanning is improved while the low-profile characteristic of the antenna unit is ensured.

The invention discloses a broadband wide-angle scanning phased-array antenna unit and an antenna array, and belongs to the technical field of antennae, the broadband wide-angle scanning phased-array antenna unit comprises a first substrate layer, a second substrate layer, a first metal ground layer, a third substrate layer and a fourth substrate layer which are arranged in sequence; the first substrate layer, the second substrate layer, the first metal ground layer and the fourth substrate layer are respectively provided with a parasitic patch, an antenna radiator, a coupling gap and a strip-shaped feeder in a laying mode. And the strip-shaped feeder feeds through a feeding point on the back surface of the fourth substrate layer, feeds to the antenna radiator through the coupling gap, and finally feeds to the parasitic patch through coupling of the antenna radiator, so that electromagnetic signals are radiated outwards. According to the slot coupling feed structure, the impedance matching between the feed structure and the radiation structure is remarkably improved, and the antenna performance is greatly improved.

The invention discloses a phase-free antenna measurement method, a phase-free antenna measurement system and a storage medium. The phase-free antenna measurement method comprises the following steps: constructing a measurement system comprising an antenna to be measured, a measurement probe, a fixed auxiliary reference antenna and software defined radio; the probe is controlled to move and sample on the scanning plane, and the SDR synchronously collects receiving signals of the probe and the reference antenna; based on the frequency domain transformation result of the two paths of signals, the radiation field amplitude of each sampling point and the relative phase relative to the reference antenna are directly calculated through non-iterative operation, so that complete complex electric field distribution on the scanning plane is reconstructed; and finally, obtaining a far-field directional diagram through near-field-far-field transformation. The fixed reference antenna is introduced to serve as a phase reference, synchronous acquisition and direct calculation are achieved in combination with the SDR, the antenna radiation field can be rapidly and accurately recovered without direct phase measurement or complex iteration in the single scanning plane and single scanning process, and the method has the advantages of being simple in system, high in measurement efficiency and high in signal drift resistance.

The invention relates to a microstrip patch antenna based on an antipodal double-helix groove, which comprises the antipodal double-helix groove, a patch, a substrate, a grounding plate and a coaxial probe, and is characterized in that the substrate is mounted on the grounding plate, the patch is mounted on the substrate, the antipodal double-helix groove is formed in the patch, and the coaxial probe sequentially penetrates through the grounding plate, the substrate and the patch; the coaxial probe is used for feeding the patch, and a radio frequency electromagnetic field is generated between the patch and the grounding plate. According to the microstrip patch antenna, the antipodal double-spiral grooves are formed, the path length of current flowing through the patch is increased, the resonant frequency of the antenna is reduced to a large extent, meanwhile, the good radiation characteristic is kept, the antenna radiation efficiency is high, the directional diagram is regular, and the electrical size of the microstrip patch antenna is reduced while the high radiation efficiency is kept.

The embodiment of the invention relates to the technical field of communication, and discloses a radar antenna and an automobile intelligent driving system.The radar antenna comprises a substrate, an electromagnetic band gap structure layer, a ridge waveguide transmission structure and an antenna radiation layer, the electromagnetic band gap structure layer is provided with a pin unit, and the pin unit forms an electromagnetic shielding area; the ridge waveguide transmission structure is arranged in the electromagnetic band gap structure layer, one end of the ridge waveguide transmission structure is connected with a chip interface, the other end of the ridge waveguide transmission structure is connected with the antenna radiation layer, and the antenna radiation layer comprises a plurality of slot antennas arranged in the longitudinal direction and a plurality of choke groove assemblies. One choke groove assembly is adjacent to one slot antenna, and the electromagnetic band gap structure layer is connected with the antenna radiation layer to form a gap waveguide transmission channel. By means of the mode, electromagnetic connection between the layers can be achieved without a welding process, and the influence of welding quality difference on the antenna performance is avoided.

The present invention provides a dual board patch array antenna, comprising: a radio board; a first-layer antenna board and a second-layer antenna board; the ground plane of the radio board is in contact with the first radiation ground plane of the first-layer antenna board through a patch-type conductive pad to form an extended ground area of ground connection; the probes of the radio board pass through and contact the patch microwave transmission line of the first-layer antenna board to form an electrical connection; wherein the patch microwave transmission line is assigned to the antenna radiating element of the second-layer antenna board as a vertically polarized antenna and a horizontally polarized antenna; the antenna radiating element contacts the first radiation surface on the first-layer antenna board through the conductor pad on the first layer antenna board, so as to expand the radiation surface area of the dual board patch array antenna.

The application discloses a kind of consistency construction and multi-dimensional parameter joint setting method and system of space field of course beacon, it is related to aviation technology field, comprising: constructing the three-dimensional electromagnetic simulation model of course beacon antenna array, the radiation directivity diagram of antenna array and channel field type characteristics are analyzed;Antenna array is installed and checked and precision is reviewed;Determine that the radio frequency performance of full transmission link meets the requirements;According to correct transmission link, adopt the method of phase matching to carry out channel antenna pair phase matching and clearance antenna pair phase matching in turn, so that the phase of the radiation signal of each antenna pair is the same, and the spatial consistency of antenna pair is constructed;Near-field-far-field signal joint test setting is carried out, near-field test data and far-field test data are obtained, channel line, displacement sensitivity and clearance signal are evaluated, combined with simulation model and actual environment, complete multi-dimensional parameter joint setting.The method significantly improves the consistency and excellence of the final combined field pattern of the space field of the course beacon, and reduces the trial-and-error cost and rework times of flight verification.

The invention belongs to the field of antennas, and particularly relates to a polarization selection electromagnetic protection circularly polarized antenna and a use method thereof. The polarization selection electromagnetic protection circularly polarized antenna comprises an antenna radiation unit which comprises a main radiation body and a plurality of current coupling perturbation structures arranged on the main radiation body; the polarization control and protection unit comprises at least two groups of protection structures and control elements corresponding to the protection structures; the two groups of protection structures are respectively arranged corresponding to two orthogonal polarization directions of the antenna and are selectively connected with the main radiator through the control element; the multi-feed network comprises a plurality of feeds which are connected according to a preset phase difference relation and is used for exciting the antenna radiation unit to generate circularly polarized radiation waves; according to the circularly polarized antenna provided by the invention, the connection state of a protection structure is switched through a passive control element under high-power microwave incidence, and the polarization characteristic of the antenna is dynamically reconstructed, so that polarization selective protection is realized and the communication capability is kept under strong electromagnetic attack.

A multi-band antenna includes a coaxial cable and two printed circuit boards. The first printed circuit board includes two radiators. The first radiator is located on a first side of the first printed circuit board. The second radiator is located on a second side of the first printed circuit board. The second printed circuit board includes a feed section and multiple frequency adjustment sections. The feed section is located on a third side of the second printed circuit board and coupled to the second radiator. The multiple frequency adjustment sections are located on a fourth side of the second printed circuit board. The first, second, third, and fourth sides are connected by multiple vias. The first radiator, second radiator, and frequency adjustment sections respectively emit a first frequency band, a second frequency band, a third frequency band, and a fourth frequency band. The frequencies are arranged in ascending order as the first, second, third, and fourth frequency bands. This invention provides an antenna structure for a multi-band antenna that can simultaneously radiate multiple frequency bands and possesses excellent antenna radiation characteristics.

The invention discloses an antenna unit capable of being used for a low RCS array, and belongs to the technical field of antennas. The antenna comprises a radiation structure layer and a feed network layer. The radiation structure layer comprises rectangular metal patches and special-shaped metal patches which are arranged in an array. The rectangular metal patches form a 2 * 4 array in the same plane; the number of the special-shaped metal patches is two, and the two special-shaped metal patches are located below the 2 * 4 array. The feed network layer is located below the radiation structure layer, and a T-shaped branch knot is arranged between an upper metal plate and a lower metal plate of the feed network layer; a radio frequency socket is arranged at the bottom of the lower metal floor, and an outer conductor of the radio frequency socket is connected with the lower metal plate; an inner conductor of the radio frequency socket penetrates through the lower metal floor and is connected with a common end of the T-shaped branch knot, and two branch ends of the T-shaped branch knot are connected with the corresponding special-shaped metal sheets through the corresponding feed probes. According to the invention, a radiation function and a scattering control function are integrated, so that the radiation performance of the antenna is ensured, and the RCS of the unit and the scattering grating lobes during array splicing use are obviously reduced.

This invention provides a method for rapid planar near-field measurement of large-aperture antennas, relating to the field of antenna technology. The method obtains sparse field amplitude and phase information of several sampling surfaces in the near-field radiation region of the antenna under test through large-step uniform sampling. Simultaneously, it samples a finite number of precise field amplitude and phase information points for each sampling surface and obtains the field distribution characteristics by calculating the fluctuation of the amplitude at the sampling points. Based on the sparse field amplitude and phase information and field distribution characteristics of the sampling surfaces, it uses partitioned interpolation and field distribution calibration methods to obtain the initial electric field of each sampling surface. Based on planar wave spectrum theory, iterative numerical calculations are performed on the initial electric field to recover the near-field distribution of each sampling surface. Finally, the far-field radiation characteristics of the antenna are obtained through near-field-to-far-field transformation. This invention can significantly shorten the testing time while obtaining key indicators of the antenna's far-field characteristics, including the normalized radiation pattern main lobe and first sidelobe, 3dB beamwidth, sidelobe level, and axial ratio.

The invention discloses an antenna housing framework for a broadband phased-array antenna, and belongs to the technical field of phased-array antennas. Which comprises a phased-array antenna body on which an antenna housing is arranged, and is characterized in that the antenna housing comprises an antenna housing upper layer, an antenna housing interlayer and an antenna housing lower layer; at least one of two sides of each layer in the three-layer structure of the antenna housing is provided with a radiation patch which is integrated with the antenna housing; the patch size of the radiation patch arranged on the antenna radiation surface of the phased-array antenna body and the patch size of the radiation patch arranged in the three-layer structure of the radome are sequentially reduced from bottom to top. According to the invention, the radiation patch is directly integrated on the antenna housing, so that the radiation patch becomes an organic component of a phased-array antenna radiation system; the radome is changed from a pure protection part to a key part with an active antenna bandwidth expansion function; the working bandwidth of the phased-array antenna can be effectively expanded on the premise that the complexity and the manufacturing cost of the phased-array antenna body are not greatly increased.

This application provides an electronic device, which includes a first device body and a second device body. The first device body has a folded state and an unfolded state relative to the second device body. The first device body includes a first frame and a first metal radiating plate. The first frame has a first antenna radiator and first slits located on both sides of the first antenna radiator. The first metal radiating plate is electrically connected to the first antenna radiator. The second device body includes a second frame and a second metal radiating plate. The second frame has a second antenna radiator and second slits located on both sides of the second antenna radiator. The second metal radiating plate is electrically connected to the second antenna radiator. The first antenna radiator has a feed connection point. The first antenna radiator is positioned corresponding to the second antenna radiator. The first slit is positioned corresponding to the second slit. In the folded state, the first antenna radiator and the second antenna radiator are coupled together through the first metal radiating plate and the second metal radiating plate.

The present application relates to the technical field of virtual reality, and particularly relates to a wearable device and an antenna control method. The wearable device comprises a handle and a head-mounted display, the head-mounted display comprising a first antenna, the first antenna comprising a first feed point and a second feed point, the handle comprising a second antenna, and the second antenna comprising a third feed point and a fourth feed point, wherein a first target pattern is generated when the first antenna is fed via a first target feed point among the first feed point and the second feed point, a second target pattern is generated when the second antenna is fed via a second target feed point among the third feed point and the fourth feed point, and an antenna radiation range indicated by the first target pattern at least partially overlaps with an antenna radiation range indicated by the second target pattern. In this way, a pattern of the head-mounted display can be kept aligned with an antenna pattern of the handle, thereby maintaining good communication quality between the head-mounted display and the handle.

The invention discloses a metal truss antenna housing and a design method thereof, and belongs to the field of radar antennas. In order to solve the problem that an antenna radiation pattern of an existing antenna housing is seriously distorted, the metal truss antenna housing comprises a metal framework and a skin arranged on the surface of the metal framework, the metal framework is of a truss structure, and a first section of at least part of rod pieces in the metal framework comprises a connecting part. The reflecting part is connected with the connecting part; the reflecting part is used for realizing non-mirror scattering between a reflected wave and the first cross section of the partial rod piece; the connecting part is used for realizing the connection between the rod pieces, and the first cross section is the cross section of one side, facing the antenna, of the rod piece. According to the metal truss, mirror reflection is converted into non-mirror scattering through the arrangement of the reflection part, so that distortion of an antenna pattern is effectively suppressed, particularly, raising of a far-region minor lobe level and loss of main lobe gain are reduced, and meanwhile, the original high-strength advantage of the metal truss is completely reserved through the arrangement of the connection part.

This utility model discloses an LTE antenna, relating to the field of antenna technology. It includes a circuit board (FPC); a radiating circuit formed on the front side of the circuit board through an etching process, comprising multiple frequency band resonant structures, including the LTE frequency band; a groove, the front portion of the circuit board excluding the frequency band resonant structures; a feed point, located on one end surface of the groove; a gap, located at the end of the circuit board near the feed point and extending to the middle of the circuit board; and an adhesive layer, located on the back side of the circuit board and covering the back side. The antenna is directly attached using the adhesive layer, eliminating the need for a traditional antenna bracket. Furthermore, the radiator's placement on the circuit board enhances the antenna's radiation directionality and improves radiation performance. The FPC substrate is ultra-thin and flexible, adapting to curved surfaces and significantly improving antenna integration efficiency and reliability. It is suitable for space-constrained scenarios such as IoT terminals and automotive devices.

The application discloses a dual-polarized microstrip patch antenna applied to a millimeter wave phased array, and belongs to the field of radio frequency front ends.The antenna mainly comprises two substrates and two patch structures, wherein the top patch is fed by two coaxial probes, the feeding port has two feeding slits, and the bottom patch is in a cross shape, which increases the cross-polarization ratio of the dual-polarized antenna radiation.The antenna realizes the dual-polarized characteristic at H plane + / -45 DEG, the 10dB relative bandwidth is 38.9%, and the radiation pattern half-power beam width is greater than 100 DEG. The antenna has the characteristics of simple structure and simple manufacturing, and can be rapidly printed and manufactured by adopting a planar microstrip structure.

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.

An antenna unit includes an antenna radiation element and a polarization selection circuit. The polarization selection circuit is configured to selectively convert an input signal to a first output signal and / or a second output signal. The first output signal and / or the second output signal is fed to the antenna radiation element so as to generate linearly polarized electromagnetic waves or circularly polarized electromagnetic waves which are radiated out by the antenna radiation element. The first output signal and the second output signal have a first phase difference therebetween that is fixed at a specific value between 0-180°.

The utility model discloses a built-in double-frequency WiFi antenna and a wireless communication device, the built-in double-frequency WiFi antenna comprises a first oscillator, a second oscillator, a third oscillator and a fourth oscillator which are electrically communicated, the fourth oscillator is provided with a first welding spot, the second oscillator is provided with a second welding spot, a coaxial cable is electrically connected with the first welding spot and the second welding spot in sequence, and the coaxial cable is electrically connected with the first welding spot and the second welding spot. The wiring tail end of the first oscillator is perpendicular to the wiring tail end of the fourth oscillator. Most antennas in the prior art are of symmetrical oscillator structures, and the wiring tail end of the first oscillator and the wiring tail end of the fourth oscillator are perpendicular to each other, so that the first oscillator and the fourth oscillator have different wiring directions instead of a single direction, the radiation angle of the antenna can be optimized, and the radiation efficiency of the antenna is improved. The problem of poor directivity of the antenna due to metal influence is avoided; and meanwhile, the coaxial cable is connected between the antenna and the mainboard, so that the antenna can be arranged far away from the mainboard, and the interference of a metal environment of the mainboard is reduced.

A system (1) for determining the radiation characteristics of an antenna includes an azimuthal positioner (50) comprising a device for rotating an antenna (2) about a vertical axis of rotation (R), a measuring arm (10) having a free end (12) and a mounting end (11), a frame (20) on which the measuring arm is mounted and comprising means for driving the mounting end of the measuring arm in a tangential plane (P1) to a cylinder of revolution with axis, the vertical axis of rotation (R), and measuring probes (40) positioned on the free end of the arm, the measuring arm extending longitudinally towards the azimuthal positioner in a horizontal direction perpendicular to the tangential plane,the drive means of the mounting end of the measuring arm driving the entire set of measuring probes in a measuring plane (P2) parallel to the tangential plane and extending at a distance from the vertical axis of rotation. Figure for the abbreviation: [Fig.1] ,