342 results about "Omnidirectional antenna" patented technology

The invention discloses a satellite terminal adaptive power adjusting system. The system comprises an attitude sensor module used for collecting three-dimensional attitude data of a terminal; the antenna pattern database is used for storing theoretical gain values of the panel omnidirectional antenna in different attitudes; the gain prediction engine is used for calculating theoretical gain according to the current attitude data and the directional diagram database; the signal quality detection module is used for collecting the intensity, the signal-to-noise ratio and the bit error rate of the received signal in real time; the power control algorithm module fuses the gain prediction value and the signal quality feedback and is used for generating a dynamic transmitting power instruction; the radio frequency power amplifier is used for executing the power adjusting instruction and outputting an adjusted transmitting signal; the invention further discloses a satellite terminal self-adaptive power adjusting method. According to the invention, the problem of balance between satellite terminal communication stability and power consumption efficiency in a complex environment is solved.

The broadband low-profile dual-polarization omnidirectional antenna comprises a horizontal polarization radiator, a metal coupling patch, a vertical polarization radiator and a metal floor which are sequentially arranged from top to bottom, the horizontal polarization radiator comprises a dielectric substrate, and a horizontal polarization radiation patch and a feed network which are printed on the upper surface and the lower surface of the dielectric substrate; the metal coupling patch comprises a metal disc and a metal circular ring nested on the circumference of the metal disc; the horizontal polarization radiation patch is connected with the metal disc through a first short-circuit line, and the metal ring and the horizontal polarization radiation patch are connected with the metal floor through four second short-circuit lines and four third short-circuit lines respectively. Through short-circuit connection between the horizontal polarization radiation patch and the metal disc and between the metal circular ring and the horizontal polarization radiation patch and the metal floor, coupling between the horizontal polarization radiation body and the vertical polarization radiation body is achieved, the electrical length of the antenna is further prolonged, the bandwidth of the antenna can be effectively widened, and the profile of the antenna can be effectively reduced.

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.

The invention provides a communication device, a communication method, a communication system, electronic equipment and a storage medium, which are applied to the technical field of communication and are used for solving the problem that the coverage range and the antenna gain of an existing intelligent antenna cannot meet the use requirements of different use environments. The communication device comprises a multiplexer and a plurality of antenna structures. The multiplexer comprises a common end and a plurality of selection ends. The common end of the multiplexer is coupled with one radio frequency channel, and the common end is used for being switched and conducted with different selection ends in the plurality of selection ends to form a plurality of paths. The multiple antenna structures comprise phased-array antennas, the multiple selection ends comprise first selection ends, and the phased-array antennas are coupled with the first selection ends. The plurality of antenna structures further comprise an omnidirectional antenna, the plurality of selection ends further comprise a second selection end, the omnidirectional antenna is coupled with the second selection end, and / or the plurality of antenna structures further comprise a directional antenna, the plurality of selection ends further comprise a third selection end, and the directional antenna is coupled with the third selection end.

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.

The invention provides a distributed team and group cooperative unmanned aerial vehicle broadband interference device and a distributed team and group cooperative unmanned aerial vehicle broadband interference method. The broadband interference device for the unmanned aerial vehicle comprises a main control unit which is used for generating a digital baseband interference signal according to received unmanned aerial vehicle wireless signal characteristic data, sending the digital baseband interference signal to a radio frequency transceiver, configuring working parameters of the radio frequency transceiver and controlling on and off of a power supply of a radio frequency unit through a power supply unit; the communication unit is used for receiving unmanned aerial vehicle wireless signal feature data detected by unmanned aerial vehicle full-frequency detection equipment in a team and sending the unmanned aerial vehicle wireless signal feature data to the main control unit; the radio frequency unit comprises a radio frequency transceiver and at least one transmitting channel, and each transmitting channel comprises a group of broadband radio frequency power amplifiers and broadband omnidirectional antennas; and a power supply unit; according to the broadband interference method for the unmanned aerial vehicle, through joint optimization design of digital interference signals in multiple dimensions such as a time domain, a frequency domain and a space domain, the weight and the size of portable interference equipment are reduced, and meanwhile, the interference capability to the unmanned aerial vehicle is improved.

The invention provides terminal equipment and a communication control method, and the method comprises the steps: controlling an antenna operation mode of the terminal equipment to be switched from an omnidirectional antenna mode to a directional antenna mode when a signal quality parameter is monitored to be smaller than a first threshold value and the terminal equipment is performing data transmission, the ability of the directional antenna mode to receive and transmit signals in a specific direction is superior to that of the omnidirectional antenna mode. And then displaying the first pose prompt information and the second pose prompt information through a display screen to prompt a user to adjust the spatial pose of the terminal equipment to a target pose. When the terminal equipment is in the target attitude, the main beam of the directional antenna of the terminal equipment is opposite and parallel to the main beam of the antenna of the service base station, the loss of a space link between the terminal equipment and the service base station is minimum, and even if the terminal equipment is in a weak signal area, additional devices are not needed. And the uplink transmitting power and the downlink receiving capability of the terminal equipment are enhanced, so that the user call and the networking application are smoother.

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 embodiment of the invention provides a communication method, terminal equipment and an antenna assembly. The communication method is used for communication between first equipment and second equipment. The communication method comprises the following steps: acquiring first communication quality, wherein the first communication quality is determined according to signal quality when a first device communicates with a second device through an omnidirectional antenna; acquiring second communication quality, wherein the second communication quality is determined according to signal quality when the first device communicates with the second device through the directional antenna; determining a target antenna in the omnidirectional antenna and the directional antenna according to the first communication quality and the second communication quality, wherein the target antenna comprises at least one of the omnidirectional antenna and the directional antenna; and establishing communication between the first device and the second device through the target antenna. The communication quality between devices can be improved or the cost of the devices can be reduced.

The utility model relates to the technical field of antenna structures, and provides a dual-port omnidirectional antenna, which comprises a dielectric substrate; the first antenna main body unit and the second antenna main body unit are arranged on the same surface of the dielectric substrate, the frequency bands of the first antenna main body unit and the second antenna main body unit are different, and the first antenna main body unit and the second antenna main body unit are arranged at intervals along the diagonal line of the dielectric substrate; the first antenna main body unit comprises a main body part and a first extension branch, the first extension branch bends and extends from one end, close to the second antenna main body unit, of the main body part and is spaced from the main body part to form a resonant filtering structure, and the resonant filtering structure is used for generating a radiation zero point in a corresponding frequency band of the second antenna main body unit; the second antenna main body unit is provided with a bending slot, the bending slot is used for generating a radiation zero point in a corresponding frequency band of the first antenna main body unit, and the dual-port omnidirectional antenna is beneficial to miniaturization, good in isolation and excellent in radiation performance.

The invention relates to the field of wireless communication, in particular to aerospace vehicle wireless communication, and discloses a dual-frequency dual-high measurement and control tracking system and method based on trajectory prediction and constellation mapping. The system comprises an L omnidirectional antenna, a C directional antenna, a dual-frequency information extraction and fitting module, a track constellation mapping and module, an antenna parameter dynamic adjustment module and an antenna tracking performance monitoring module. The dual-frequency information extraction and fitting module receives data of the two antennas, extracts flight information of a fitted aircraft and outputs coordinate conversion parameters; the trajectory constellation mapping and module predicts a short-term flight trajectory of the aircraft according to the coordinate conversion parameters and outputs flight trajectory constellation coordinate range information; the antenna parameter dynamic adjustment module sets a tracking interval according to flight path constellation coordinate range information, and outputs high-precision antenna pointing information to control a C directional antenna in combination with directional antenna parameters; the antenna tracking performance monitoring module is used for evaluating the directional performance of the C directional antenna.

The utility model provides an omnidirectional antenna assembly and an electronic device so as to avoid the reduction of the influence of a metal plate on the radiation pattern and efficiency of an antenna structure, and equivalent magnetic dipoles generate horizontal polarization radiation. In the omnidirectional antenna assembly provided by the utility model, the metal plate and the antenna structure are arranged on the same side of the circuit board, the metal plate is used for realizing heat dissipation of the omnidirectional antenna assembly, the metal plate and the antenna structure are adjacently arranged in the direction parallel to the circuit board, and the projection part of the antenna structure and the projection part of the circuit board coincide. The antenna structure can be exposed while the metal plate can dissipate heat of the antenna structure, so that the influence of the metal plate on the radiation pattern and efficiency of the antenna structure is reduced, and the radiation pattern and efficiency of the antenna structure and the metal plate are improved. The electronic equipment provided by the embodiment of the invention is fiber to the room (Fiber To Room, short for FTTR), so that bidirectional communication between the user equipment and the communication system can be realized.

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.

To provide an omni-directional antenna with a simple configuration.SOLUTION: An antenna includes a main body. The main body includes: a reception unit; a first conversion unit; a second conversion unit; and a radiation unit. The reception unit receives an electromagnetic wave of a TE10. The first conversion unit is connected to the reception unit and converts a TE10 mode into a TE20 mode in a waveguide. The second conversion unit is connected to the first conversion unit and converts the TE20 mode into a TE01 mode in the waveguide. The radiation unit is connected to the second conversion unit. The reception unit, the first conversion unit, the second conversion unit, and the radiation unit are disposed along a predetermined radiation axis.SELECTED DRAWING: Figure 1

The present invention discloses a dual-polarization omnidirectional rectenna using a radio frequency power combining scheme. The antenna includes an orthogonally arranged horizontal polarization unit and a vertical polarization unit. The horizontal polarization unit includes a horizontal polarization group, which includes a tapered balun. The center point of the tapered balun is a feeding point. The tapered balun has a plurality of fan-shaped radiating branches evenly distributed circumferentially, and each of the radiating branches is connected to the tapered balun via a gradient microstrip line. The vertical polarization unit includes a reflective layer and a vertical polarization group parallel to the reflective layer. The vertical polarization group includes a connected gradient balun and a dipole, and the feeding point is located at the center of the gradient balun. The present invention provides a circumferentially arranged omnidirectional antenna array to receive horizontally polarized electromagnetic waves, and designs a four-dipole array to receive vertically polarized electromagnetic waves. This allows the antenna to operate in multiple polarization states and has good omnidirectional characteristics.

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 discloses a 1710-2690 MHZ dual-polarized two-port omnidirectional antenna, and relates to the technical field of antennas for communication. The omnidirectional antenna comprises an antenna base, a waterproof connector is arranged on the antenna base, one ends of two coaxial cables penetrate through the antenna base and then enter an outer cover of the omnidirectional antenna, a supporting rod is arranged in the outer cover, the lower end of the supporting rod is fixedly connected with the antenna base, and the waterproof connector is arranged on the antenna base. Six dual-polarized oscillators are fixed on the supporting rod at intervals, two one-to-two power dividers and four one-to-three power dividers are fixed on the supporting rod, and the dual-polarized oscillators, the one-to-three power dividers and the one-to-two power dividers are connected through coaxial cables. The omnidirectional antenna can effectively utilize antenna feeder site resources, and is small in size and simple in structure.

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 utility model relates to the technical field of underground pipeline detection devices, in particular to a detection device with an adjusting function, which can ensure that a first adjusting rod and a fixed rod are kept vertical during detection and use, so that the detection and use of the device are prevented from being influenced. Comprising a detection handle, the left side of the bottom of the detection handle is fixedly connected with a connecting rod, the lower end of the connecting rod is connected with an omnidirectional antenna bag, the lower end of the omnidirectional antenna bag is connected with a fixing rod, the bottom end of the fixing rod is fixedly connected with the top end of a folding clamping seat, and the bottom end of a folding block is fixedly connected with a first adjusting rod; the folding block is rotatably installed on the folding clamping base through cooperation with the hinge, the clamping block is integrally and fixedly arranged at the top end of the folding block, a bolt pin hole is formed in the clamping block in a penetrating mode, a bolt pin is inserted into the folding clamping base, the clamping block is clamped on the folding clamping base through cooperation of the bolt pin and the bolt pin hole, and the bolt pin is sleeved with a lock nut in a screwed mode. The rear end of the lock nut abuts against the front end of the folding clamping base.

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.

The utility model provides an intelligent personnel limiting device for a mining working face, which relates to the technical field of mining safety monitoring devices and comprises an outer shell, a main control board, a positioning statistics module and a voice alarm module are arranged in the outer shell, and the main control board is electrically connected with the positioning statistics module and the voice alarm module respectively. An LED display unit is arranged on the outer wall of one side of the outer shell, omnidirectional antennas are arranged at the tops of the two ends of the outer shell, and the omnidirectional antennas are electrically connected with the positioning statistics module. According to the device, personnel in the working face are positioned and counted, the personnel are displayed through the LED display unit, an alarm is given through the voice alarm module when the number of personnel exceeds a limit value, the safety management level of the mining working face is effectively improved, the accident risk is reduced, meanwhile, the operation process is optimized, and the production efficiency is improved.

The present application belongs to the field of wireless communications, and discloses a communication method, apparatus, and device, a medium, and a program product. The method is executed by a first wireless device. The method comprises: sending a first frame, the first frame being used for indicating information related to beamforming training, and the beamforming training being related to an omnidirectional antenna mode and / or a quasi-omnidirectional antenna mode. Measurement of signal quality in the omnidirectional antenna mode and / or the quasi-omnidirectional antenna mode is facilitated, thereby improving the quality and efficiency of data transmission in the omnidirectional antenna mode and / or the quasi-omnidirectional antenna mode.

The utility model relates to the technical field of communication and antennas, and discloses a dual-mode omnidirectional antenna comprising an antenna housing, the bottom of the antenna housing is provided with an angle adjusting assembly, the angle adjusting assembly is used for adjusting the angle of the antenna according to requirements, the bottom of the angle adjusting assembly is provided with an anti-falling assembly, and the anti-falling assembly is used for adjusting the angle of the antenna according to requirements. The anti-falling assembly is used for preventing the antenna from falling off through friction force, and the angle adjusting assembly comprises a rotating ball head. According to the dual-mode omnidirectional antenna, the angle adjusting assembly is installed, the limiting frame can be used for limiting the rotating ball head on the inner side through the spherical groove on the inner side, the rotating ball head can be turned over and adjusted on the inner side, and due to the fact that friction force exists between the combined shaft and the combined groove, the rotating ball head can be turned over and adjusted. Manual bending is needed during angle adjustment, a worker can conveniently conduct overturning adjustment and resetting, and the opening in the inner side can keep normal connection of the connecting line and cannot be affected by bending.

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 invention discloses an omni-directional anti-interference anti-off-line router, and relates to the technical field of routers, the omni-directional anti-interference anti-off-line router comprises a shell, a main control board, omni-directional antenna groups and an anti-off-line assembly, the main control board is arranged in the shell, the omni-directional antenna groups are installed on the side face of the outer wall of the shell, and the anti-off-line assembly is installed on the rear side of the outer wall of the shell. The anti-off-line assembly comprises a baffle, supports and a positioning wheel, the supports are arranged on the two sides of the outer wall of the baffle and connected with the baffle and the positioning wheel, a through threaded hole is formed in the side face of the positioning wheel, a plurality of positioning holes are formed in the notch, the positioning wheel is connected with the shell through a screw, and the screw penetrates through the threaded hole to be connected with the positioning holes. Through the linkage design of the blocking pieces, the positioning wheels and the notches, dynamic adjustment adaptive to various network cable anti-off is achieved, the problem that traditional buckle type fixing cannot adapt to different cable diameters and stress directions is solved, and the anti-off capability and the external force buffering efficiency when multiple devices are connected in series are improved.

The invention provides a broadband omnidirectional antenna which is characterized in that the antenna is composed of two U-shaped modules, a bisection power divider and a coaxial feeder line; each U-shaped module is composed of a U-shaped reflecting plate, a radiation patch and a probe and can form a broadband weak directional wave beam, the two U-shaped modules are arranged back to back at a certain interval, the interval distance is slightly larger than the outer diameter of a coaxial feeder line, and the U-shaped modules are used for collecting the coaxial feeder line and enabling the coaxial feeder line to pass through smoothly. The two U-shaped modules are connected with a bisection power divider through respective coaxial probes and are subjected to in-phase synthesis to obtain a broadband omnidirectional wave beam of which the frequency bandwidth is greater than 85.7%; and a plurality of broadband omnidirectional antennas are linearly arranged, so that a broadband high-gain omnidirectional array is easy to form.

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.