49results about How to "Omnidirectional" patented technology

The invention discloses an improved biconical antenna for UHF waveband passive radar. The antenna comprises an upper radiation arm, a lower radiation arm and a feed structure, wherein the upper radiation arm and the lower radiation arm are symmetrically and coaxially arranged and connected into a whole, a first cylindrical vibrator and a first conical vibrator are connected to form the upper radiation arm, a second conical vibrator and a second cylindrical vibrator are connected to form the lower radiation arm, the diameter of the top surface of each conical vibrator is equal to the diameter of each cylindrical vibrator, the first conical vibrator and the second conical vibrator are symmetrically arranged in the mode that conical tips are opposite, and the first conical vibrator and the second conical vibrator are not in contact; the feed structure is composed of an SMA-K type connector and a 1:1 balun, the SMA-K type connector is arranged on the internal conical tip portion of the second conical vibrator, the balun is arranged between the first conical vibrator and the second conical vibrator, the SMA-K type connector is connected with the input end of the balun, and the output end of the balun is connected with the upper radiation arm and the lower radiation arm of the biconical antenna. According to the improved biconical antenna, directional diagram consistency is higher on the working band, the size is smaller, and the antenna is convenient to carry.

Provided is a UHF plane inverted-F and monopole combined antenna applied to an RFID reader-writer. The UHF plane inverted-F and monopole combined antenna applied to the RFID reader-writer comprises a main radiation part (2) of an inverted-F antenna, a deformed radiation branch tail end part (1) of the inverted-F antenna, short circuit microstrip lines (3) of the inverted-F antenna, a feeder (5) of the antenna and a short circuit probe (4), wherein the antenna is arranged on the obverse face of a dielectric plate, and an earth plate is arranged on the reverse face of the dielectric plate. Through deformation of the radiation branch tail end part of the plane inverted-F antenna, the plane inverted-F and monopole combined antenna is formed; the radiation branch tail end part of the inverted-F antenna is divided into two paths of microstrip lines, a monopole antenna model is formed, and the far field radiation of the antenna has the characteristics of a monopole antenna; the three face surrounding technology is adopted for the earth plate of the designed antenna, and the influence on an integrated circuit from radiated electromagnetic waves is reduced. Not only is the advantage of high gains of the plane inverted-F antenna reserved, but also the advantage of good omni-directivity of the monopole antenna is achieved. The UHF plane inverted-F and monopole combined antenna applied to the RFID reader-writer is applicable to the field of UHF antennas of RFID reader-writers.

The invention relates to a dual-notch miniaturized ultra-wideband microstrip antenna with electrically adjustable frequency. The dual-notch miniaturized ultra-wideband microstrip antenna comprises a dielectric substrate, a microstrip feeder line and a radiation patch, the micro-strip feeder line and the radiation patch are loaded on the front surface of the dielectric substrate; the radiation patch is provided with an arc-shaped edge, and one end, provided with the arc-shaped edge, of the radiation patch is connected with the microstrip feeder line; the system further comprises a floor. The floor is of a rectangular structure and is loaded at the lower position of the reverse side of the dielectric substrate, the length of the floor in the horizontal direction is equal to that of the dielectric substrate, and the height of the floor in the vertical direction is equal to that of the microstrip feeder line, so that three sides of the floor coincide with three sides of the dielectric substrate; a notch groove is formed in the top edge of the floor, and symmetrical arc-shaped chamfers are arranged at the two ends of the top edge of the floor. The antenna size and cost can be reduced, and the antenna is simple in structure, stable in radiation performance and easy to integrate.

The invention discloses a method for achieving omni-directional coverage of wave beams of an array antenna. The method for achieving the omni-directional coverage of the wave beams of the array antenna comprises the steps that whether signal transmission exists in a specific direction (phi and theta) is firstly determined, wherein phi is an azimuth angle in a spherical coordinate and theta is a zenith angle in the spherical coordinate; a virtual signal from the direction (phi and theta) is generated through calculation; a signal obtained by each antenna unit is calculated; the weight w of each antenna unit of the array antenna is obtained through calculation according to the power inversion and zero adjustment algorithm; the signal of each antenna unit of the array antenna is multiplied by the weight of the antenna unit; signals which are obtained after the signals of the antenna units of the array antenna are multiplied by the weights of the antenna units in last step are added. The method for achieving the omni-directional coverage of the wave beams of the array antenna has the advantages that the defect that wide wave beams can not be achieved by a traditional array antenna is overcome, and the virtual signal and the zero adjustment method of Gaussian noise are adopted to enable the wave beams of the array antenna to be omni-directional; the widths of the wave beams of the antenna are close to the widths of wave beams of a single antenna unit of the array antenna, and the gain of wave beams of the antenna is larger than the gain of the wave beams of the single antenna unit of the array antenna.

A miniature low-frequency omnibearing planar antenna comprises a radiating body, wherein the radiating body is horizontally arranged, four angles of the radiating body are fixed above a shell, the radiating body is formed by spirally grooving four arms of a microstrip printed board, a metal plating layer of the microstrip printed board is arranged in a Swastika emblem plane, four trimming resistors are welded in a reserved gap in the lower surface of the microstrip printed board, a tail end of a metallic part at the lower surface of the microstrip printed board is welded with one end of each of four short-connected branches, the other ends of the four short-connected branches are welded on a metal floor, the metal floor is pasted on the inner surface of the bottom surface of the shell and fixedly welded with an outer conductor, a connector is arranged on the outer surface of the bottom surface of the shell, and a feed stud is welded on an insertion needle of the connector and vertically and fixedly connected with a feed round disc. With the adoption of the feed round disc for coupling feeding, the antenna compatibility is improved; and the antenna bandwidth is effectively expanded by the four trimming resistors, so that the miniature low-frequency omnibearing planar antenna meets the requirements of a frequency band of 243 to 248 MHz and bandwidth of 5MHz and has the characteristics of small volume, low profile and vertical polarization.

The invention belongs to the field of machinery, and particularly relates to a vibration isolation bearing pedestal utilizing a two-stage vibration isolation technology. The vibration isolation bearing pedestal utilizing the two-stage vibration isolation technology provides multi-directional vibration isolation for a rotating part, is directly installed on a vibration source, conducts direct vibration isolation on the vibration source and does not adopt the mode that vibration isolation of an existing facility is located between a foundation and the whole facility. According to the technical scheme, the vibration isolation bearing pedestal utilizing the two-stage vibration isolation technology comprises a bearing body and further comprises a bearing fixing ring, an inner base fixing ring and a bearing supporting base. The bearing body, the bearing fixing ring and the inner base fixing ring are arranged in a sleeving mode in sequence from inside to outside. The bearing fixing ring and the inner base fixing ring are connected through primary vibration isolation devices. The inner base fixing ring and the bearing supporting base are connected through secondary vibration isolation devices. A primary leaf spring outer ring is arranged on an inner ring of the inner base fixing ring.

The invention discloses a semi-U-shaped ultra-wideband patch antenna, which comprises a grounding metal plate, wherein a short circuit piece is vertically arranged on the grounding metal plate, a toppatch is arranged on the short circuit piece, and the top patch is parallel to the grounding metal plate; the top patch is provided with a first notch, one end of the first notch is communicated witha second notch, the first notch and the second notch are perpendicular to each other to form a semi-U shape, the second notch extends to one side of the top patch to form an opening, and the edge of the second notch is provided with a first right-angle piece extending towards the grounding metal plate; a second right-angle piece is arranged at the end part of the first right-angle piece and is parallel to the grounding metal plate; and the second right-angle piece is connected with a feeder end. The patch antenna has an ultra-wideband, the radiation direction is omnidirectional, the radiationdirection characteristic of the antenna is kept stable in the whole bandwidth range, and the gain is relatively good.

The invention provides an omnidirectional short-wave high-gain antenna array, which mainly solves the problems of the short-wave station antenna in prior arts including large occupied area, small quantity and low gain. The omnidirectional short-wave high-gain antenna array comprises vertically-polarized antennae and horizontally-polarized antennae, wherein the vertically-polarized antennae are omnidirectional circular array antennae composed of a plurality of pairs of corner reflector antennae (4) or log-periodic antennae (61) and a supporting rod; and the horizontally-polarized antennae comprise a low-frequency horizontally-polarized antenna (3) and a high-frequency horizontally-polarized antenna (5). The low-frequency horizontally-polarized antenna (3) is composed of two pairs of binary orthogonal horizontally-polarized branched cage type array antennas (7), and the high-frequency horizontally-polarized antenna (5) is composed of a plurality of pairs of binary horizontally-polarized branched cage type array antennas (51) with same structures. The low-frequency horizontally-polarized antenna (3) and the high-frequency horizontally-polarized antenna (5) are fixed on the surface and the circumference of the omnidirectional circular array antenna, respectively. The omnidirectional short-wave high-gain antenna array has the advantages of small occupied area and high antenna gain and can be used as a communication antenna of near, middle and far distances.

The invention discloses a VHF-UHF band broadband omnidirectional receiving antenna, which includes a first structure and a second structure arranged symmetrically up and down, and the first structure includes a first conical vibrator, a second conical vibrator and several connecting rods , the second structure includes a second conical vibrator, a first conical vibrator and several connecting rods, the first conical vibrator is connected to the second conical vibrator through the connecting rod, and the second conical vibrator is connected to the first conical vibrator through the connecting rod The first conical vibrator and the second conical vibrator are coaxially arranged in such a way that the cone tips are opposite; the first conical vibrator and the first conical vibrator are located on the same side of the antenna feed point, and the second conical vibrator And the second frustum-shaped dipole is located on the other side of the antenna feed point. Compared with the traditional biconical antenna, the invention has a wider operating frequency band, an impedance bandwidth of less than 2.3 with a standing wave ratio of more than four octaves, and an omnidirectional pattern on the horizontal plane. At the same time, the antenna is smaller in size and easy to carry.

The invention discloses a four-wall helical antenna which comprises a TNC connector assembly, a PCBA, a first metal rack, a metal holder, an insulating ring, a straight metal line, an insulating rubber rod, helical metal wires, a filament plate PCBA and a second metal rack, wherein four helical grooves which do not block each other are formed at the periphery of the insulating rubber rod, the helical metal wire is mounted in each of the helical grooves, one end of the helical metal wire is fixed through the filament plate PCBA and the other end of the helical metal wire is connected to the PCBA through the first metal rack and the second metal rack, and the four helical metal wires are fixed through the insulating ring; the straight metal wire is arranged in the hollow part of the insulating rubber rod and is connected to the PCBA through the metal holder and passes through the insulating ring; the other end of the PCBA is connected to the TNC connector assembly. According to the four-wall helical antenna disclosed by the invention, the omnidirectivity of the antenna and the reception function of a dextral elementary pole are realized without being limited by direction. The performance of the antenna is further optimized and enhanced, the reception ability is relatively strong, and the antenna belongs to an omnidirectional satellite reception antenna.

The invention discloses a double-port double-layer planar spiral slot antenna, and the antenna comprises an upper substrate and a lower substrate which are fixedly connected in a laminated manner, wherein a microstrip line A and a microstrip line B are arranged on the upper surface of the upper substrate; an elliptic metal ring is arranged on the lower surface of the upper substrate; an annular gap is formed at the outer side of the oval metal ring. The remaining part of the lower surface of the upper substrate is provided with a metal layer A; two spiral metal arms are arranged on the lower surface of the lower substrate; annular gaps are formed at the outer sides of the two spiral metal arms; a metal layer B is arranged at the outer side of the annular gap; the microstrip line A is located above the elliptic metal ring; and the microstrip line B is connected with one of the spiral metal arms through a metal wire. The antenna is provided with the two microstrip lines used for feeding,and the isolation degree between corresponding ports of the two microstrip lines is large, so the antenna can serve as two antennas and be used for communication modules with different frequencies, thereby reducing the size and cost of a communication system.

The invention discloses an RFID tag, which includes a waterproof base sheet, on which an RFID chip and an RFID antenna signal-connected to the RFID chip are arranged; the RFID chip and the RFID antenna are encapsulated in a packaging colloid; read Long distance, its reading distance can reach 11‑13m after testing. The reading distance of ordinary RFID tag antennas is less than 10m. Various antennas have good performance, small standing wave ratio, low return loss, high gain and omnidirectionality; they have high performance when used in ultra-high frequency (860-960MHz), especially around 925MHz.

The invention discloses an internal driving method of a three-wheel turning body of a spherical robot. The spherical robot comprises a spherical shell, a detector support, a detector, a circuit module, a supporting plate, a battery compartment and an actuating device, wherein the detector support is provided with a bull-eye wheel, and the actuating device comprises a Mecanum wheel and a drive motor. The internal driving method comprises the first step of obtaining a target parameter, the second step of controlling the orientation of the spherical robot, the third step of controlling three wheels to stop running after the orientation of the spherical robot faces a target position, the fourth step of controlling a number two wheel and a number three wheel to conduct uniform velocity and inverted running, the fifth step of controlling the three wheels to stop running after the circuit module receives a signal that the spherical robot arrives at the target position, and at this time, the spherical robot precisely arrives at the target position. According to the internal driving method of the three-wheel turning body of the spherical robot, the problems that in the prior art, the movement is not flexible and convenient, the movement efficiency is low, and the monitoring capacity is greatly limited by environmental facilities are solved.

This invention discloses a kind of antennas including a radiation patch, an earth patch and a medium base plate, said radiation patch and the earth patch are adhered to the top surface of the base plate and a notch port is set between the radiation patch and the earth patch, which can increase gain of antennas.

The invention discloses a double-indoor ceiling-absorbing broadband omnidirectional MIMO antenna, which is characterized in that it includes a reflective base plate, left and right radiating vibrators, an interval is left between the left and right radiating vibrators, and the reflecting base plate is provided with supports The left and right radiating oscillators are respectively fixed on the reflective base plate through the supporting columns; the left and right radiating oscillators have groove 1 and branches for standing wave optimization; the reflecting base plate has groove 2 and guide units, and The slot is located between the left and right radiating oscillators. The invention is a broadband MIMO antenna that completely covers the existing mobile communication frequency band, and can well improve the problem of the current indoor coverage of wireless signals.

The invention discloses a vital sign simulation device for rescue training and a simulation method. The vital sign simulation device comprises a shell and a radar cross section simulation sheet for simulating corresponding radar cross section sizes during the human body target detection of a radar, wherein the radar cross section simulation sheet is fixed in the shell, and the radar cross sectionsimulation sheet swings according to specified amplitude and frequency so as to simulate the vital sign state of a human body. According to the simulation method, the area, swing amplitude and swing frequency of the radar cross section simulation sheet during the simulation of different human body targets are determined in advance; and during rescue training, the vital sign simulation device is arranged at a designated position; the radar cross section simulation sheet is made to swing according to target amplitude and frequency. The vital sign simulation device for rescue training of the invention has the advantages of simple and compact structure, low cost, small weight and small size, and can be applied to the rescue training of radar life detector devices so as to realize vital sign simulation. The vital sign simulation device has the advantages of high simulation precision and the like.