34results about How to "Realize omnidirectional radiation" patented technology

The invention discloses a binary frequency reconfigurable microstrip antenna, and belongs to the technical field of basic electrical elements. The frequency reconfigurable antenna is composed of an intermediate layer dielectric substrate, an upper layer microstrip structure arranged on the intermediate layer dielectric substrate and a bottom layer metal floor with a rectangular defected ground structure, the upper-layer microstrip structure comprises a short microstrip feeder line, a long main microstrip line and microstrip annular structures with different sizes, wherein the microstrip annular structures surround the two sides of the main microstrip line. A gap is reserved between the main microstrip line and each of the annular structures on the two sides to place three PIN diodes, and the effective electrical length of the antenna is changed through on-off of the diodes to achieve the three-bit binary frequency reconfigurable characteristic. The design is simple in structure and small in size, is realized in the form of a microstrip circuit, only uses three PIN diode switches to realize eight different working states, can meet the frequency requirements under different communication systems, has a directional diagram in a low-frequency working state similar to the directional diagram of a half-wave oscillator, and realizes omnidirectional radiation on an H surface.

The invention provides a miniaturization multi-resonance antenna. The miniaturization multi-resonance antenna comprises a dielectric substrate, an annular radiation unit and a non-symmetric coplanar line feed transmission line arranged on the dielectric substrate, a parting structure radiation unit and a monopole radiation unit embedded in the annular radiation unit, and a half edge grounding plane arranged on the dielectric substrate; a dual-U-shaped radiation unit and the monopole radiation unit are both connected with the annular radiation unit; the non-symmetric coplanar line feed transmission line is connected with an inner conductor of an SMA; and an outer conductor of the SMA is connected with the grounding plane. The miniaturization multi-resonance antenna disclosed in the invention adopts the non-symmetric coplanar line feed structure and the inter-radiation-unit feed and multi-radiation-unit fusion design, so that a miniaturization design effect is achieved; and in addition,each radiation unit can be designed independently, so that multi-frequency-band design can be realized conveniently.

The invention discloses a dual-band dual-mode wireless body area network antenna, i.e., a planar microstrip antenna with dual purposes of on-body communication and out-of-body communication. Omnidirectional radiation and directional radiation are independently realized by working under a monopole mode and a cavity resonant mode. The structure of the antenna comprises an upper layer dielectric slaband a lower layer dielectric slab, wherein the upper surface of the upper layer dielectric slab is coated with metal to serve as the main radiator of the antenna, and the lower surface is not coatedwith the metal; the upper surface of the lower layer dielectric slab is coated with a metal layer to serve as the metal ground of the antenna, and the metal ground is provided with a round hole for afeeding metal column to pass; the lower surface of the lower layer dielectric slab is also coated with one section of rectangular metal structure; and two layers of dielectric slabs are connected through three metal columns, wherein the middle metal column is the feeding metal column for connecting the radiator with the tail end of the microstrip antenna, and the other two metal columns are independently connected with the radiator and the metal ground. By use of the antenna, the problem that an existing antenna feeding system with dual purposes of on-body communication and out-of-body communication is complex can be solved.

The invention provides a terminal with a reconfigurable antenna. The terminal comprises a non-grounding metal frame, an alloy bottom plate, a feed source, a suspension metal body, a first grounding circuit and a second grounding circuit, wherein the feed source is connected with the non-grounding metal frame, the non-grounding metal frame is connected with the suspension metal body, the suspensionmetal body serves as a suspension reference ground, the first grounding circuit comprises a first control switch and a first grounding point, the first signal end of the first control switch is connected with the non-grounding metal frame, the second signal end of the first control switch is connected with the first grounding point, the first grounding point is used for connecting the alloy bottom plate, the second grounding circuit comprises a second control switch and a second grounding point, the first signal end of the second control switch is connected with the suspension metal body, thesecond signal end of the second control switch is connected with the second grounding point, and the second grounding point is used for connecting the alloy bottom plate. According to the terminal provided by the invention, the reconstruction of the antenna radiation direction in the narrower and narrower trend of the clearance zone is realized, and the omnidirectional requirement of the antennain the terminal can be met.

The invention discloses an omnibearing circularly-polarized antenna of a handheld terminal. The antenna comprises a floor plate, dielectric substrates arranged on the floor plate, an inverted-F antenna and a monopole antenna which are both arranged on the dielectric substrates, wherein the plurality of dielectric substrates are sequentially connected on the floor plate to form a closed enclosure frame, and the inverted-F antenna and the monopole antenna are respectively arranged at the corners of the two dielectric substrates, and the inverted-F antenna and the monopole antenna are mutually connected, and a feed interface is arranged at the joint of the inverted-F antenna and the monopole antenna. According to the invention, the application of the antenna on the handheld terminal can be effectively realized, and the problems of miniaturization and the like are solved.

The invention discloses a single-port dual-frequency dual-polarization omnidirectional antenna applied to WIFI, which comprises a reflecting plate, a horizontally arranged first dielectric plate and a vertically arranged second dielectric plate, and is characterized in that a first dipole antenna and a second dipole antenna are symmetrically attached to the upper surface and the lower surface of the first dielectric plate; a dipole antenna array composed of four dipole antennas is formed, the dipole antenna array is used for achieving omnidirectional radiation and horizontal polarization characteristics of 5G signals, a radiator and a feed wire are attached to the first surface of the second dielectric plate, a ground wire is attached to the second surface of the second dielectric plate, the middle of the radiator is connected with the feed wire to form a feed point, the two tail ends of the radiator are connected with the reflecting plate to form a loop for realizing omnidirectional radiation and vertical polarization characteristics of 2.4 G signals, and the omnidirectional antenna provided by the invention has the characteristics of single port, double frequency, horizontal and vertical dual polarization, wide frequency, small size, good omnidirectional performance and high average gain.

The invention discloses a broadband dipole. The broadband dipole comprises a reflection plate and a radiation unit installed on one side surface of the reflection plate. The radiation unit comprises aradiation assembly, a feed balun and a matching network. The radiation assembly is electrically connected with the matching network through the feed balun, the matching network is fixed on the reflection plate, and the radiation assembly is integrally of a curved surface structure arched towards the direction far away from the reflection plate. The radiation assembly comprises a flexible radiation base body and an insulating supporting piece, wherein the radiation base body is attached and fixed on the insulating supporting piece, and the insulating supporting piece is fixedly connected withthe reflecting plate. According to the invention, the effect of realizing broadband performance in an extremely small space can be achieved.

A small-sized intersecting and bending omnidirectional ultra-wideband antenna is disclosed and is used for solving a problem that a conventional small-sized ultra-wideband antenna cannot realize omnidirectional radiation and is large in cross-sectional area. Four semicircle sheets are the same in radius and intersect with each other vertically in pairs, two dipoles that are respectively a first dipole and a second dipole are formed, a coaxial line is positioned on center lines of the semicircle sheets, the coaxial line is connected with the first dipole after running through the second dipole, arc parts of the two dipoles are arranged in a face to face manner, top ends of arcs of the two dipoles are h1 from each other, each semicircle sheet is bent 90 degrees in an anticlockwise direction at r/2 from a left side and a right side of a straight line, and r is radius of the semicircle sheet. The small-sized intersecting and bending omnidirectional ultra-wideband antenna is suitable for occasions where omnidirectional ultra-wideband antennas are applied.

The invention discloses a claw type ultrasonic transducer. The claw type ultrasonic transducer comprises a sandwich type piezoelectric ultrasonic transducer, a amplitude-changing pole and a claw typeomnidirectional radiator, wherein one end of the amplitude-changing pole is fixedly connected with the sandwich type piezoelectric ultrasonic transducer, and the other end of the amplitude-changing pole is fixedly connected with the claw type omnidirectional radiator; the sandwich type piezoelectric ultrasonic transducer comprises a rear cover plate, a piezoelectric ceramic crystal heap, and a front cover plate, and the rear cover plate, the piezoelectric ceramic crystal heap and the front cover plate are fixed together through stress bolts; and the claw type omnidirectional radiator comprisesa claw bottom and clamp fingers, one end of the claw bottom is fixedly connected with the amplitude-changing pole, the claw fingers are fixedly connected to the other end of the claw bottom, the clawbottom is of an open type structure, the plurality of claw fingers are arranged, and the claw fingers are uniformly distributed in the circumferential direction of the claw bottom. 360-degree omnidirectional acoustic radiation is achieved through the high-order bending vibration mode while high frequency and high power are achieved so that the acoustic radiation efficiency and the sound field action range can be improved, and the uniformity of a radiation sound field can be improved.

The monopole water antenna comprises a coaxial cable, a metal bottom plate, a Teflon base, a first water tank, a second water tank and four arc-shaped water arms, the Teflon base is located above the metal bottom plate, the lower end face of the Teflon base is attached to the upper end face of the metal bottom plate, the first water tank is achieved by forming a cylindrical cavity in a cylindrical body, and the second water tank is achieved by forming a second cavity in the cylindrical body. The cylindrical main body is located above the Teflon base, the lower end face of the cylindrical main body is attached to the upper end face of the Teflon base, an inner core of the coaxial cable sequentially penetrates through the metal bottom plate, the Teflon base and the bottom of the cylindrical main body and then enters the cylindrical cavity, and the second water tank is achieved by forming a cone frustum cavity in the cone frustum main body. The small head end of the cone frustum main body is attached to the upper end face of the cylindrical main body, four through holes communicated with the cone frustum cavity are evenly formed in the side wall of the cone frustum main body along a circle at intervals, and the four arc-shaped water arms are installed at the four through holes in a one-to-one correspondence mode; the antenna has the advantages that the structure is simple, and omnidirectional radiation can be realized in two working frequency bands.

The invention discloses a street lamp structure with a built-in antenna, and the structure comprises a lamp cap and a lamp holder; a lamp post is connected between the lamp cap and the lamp holder; the lamp post also serves as an antenna body, and an omnidirectional antenna is arranged in the antenna body; the lamp holder is fixed to a cement foundation through foundation bolts, and a wiring pipeis arranged in the cement foundation. The omnidirectional antenna comprises a dielectric substrate, and a plurality of groups of radiation units are arranged on the dielectric substrate, wherein any radiation unit comprises a first radiation arm arranged on the front surface of the dielectric substrate and a second radiation arm arranged on the back surface of the dielectric substrate, the first radiation arm and the second radiation arm are symmetrically arranged up and down, and a feed device connected with a cable device is arranged between the first radiation arm and the second radiation arm. According to the invention, signal coverage of the frequency band of 806-960 MHz can be achieved while normal lighting is met; meanwhile, the advantages of good concealment, small size, light weight and low cost are achieved, and panic of community residents to the electromagnetic environment can be greatly reduced.