30results about How to "Good omnidirectional radiation performance" patented technology

The invention discloses a photon band-gap double folding dipole double frequency band antenna, relating to a microstrip antenna. The invention provides a photon band-gap double folding dipole double frequency band antenna of a movable terminal of a compatible radio frequency identification system and a 3G system, which has small size, large bandwidth, lower return loss and omidirectional radiation characteristics; the antenna is provided with a medium base plate with one surface bonded with copper, and in the area which is bonded with copper, a left folding dipole radiation patch, a right folding dipole radiation patch and a connecting patch which is connected with the left folding dipole radiation patch and the right folding dipole radiation patch are arranged, wherein the left folding dipole radiation patch and the right folding dipole radiation patch have the same structure; the left folding dipole radiation patch is positioned at the left side of the medium base plate and the right folding dipole radiation patch is arranged at the right side of the medium base plate; the connecting patch is positioned between the left folding dipole radiation patch and the right folding dipole radiation patch.

The invention relates to a distributed multi-point feeding broadband vertically polarized omnidirectional antenna, which belongs to the technical field of antennas. Including, a dielectric cavity composed of four identical radiating substrates, the dielectric cavity is placed vertically on the metal base plate, and the antenna radiator part is printed on the surface of the dielectric cavity; a feeder for multi-point feed The substrate, the feed substrate is placed parallel to the metal base plate and placed inside the dielectric cavity, the upper surface of the feed substrate is printed with an equal-power microstrip matching circuit for feeding the antenna radiator part; a metal base plate , the dielectric cavity and the feeder substrate are both on the upper surface of the metal bottom plate; a radio frequency joint, the inner core of the radio frequency joint is connected with the center of the equal power distribution microstrip matching circuit. The antenna of the present invention realizes the broadband and omnidirectional characteristics of the vertically polarized antenna at the same time, and the antenna is easy to be integrated with other antennas to realize the integration and miniaturization of multiple antennas.

The invention discloses a fractal photon bandgap bent line microstrip antenna for an ultra-broadband system, relating to a microstrip antenna. Provided is a fractal photonic bandgap meander line microstrip antenna for ultra-wideband systems with small size, large bandwidth, low return loss and omnidirectional radiation characteristics. Dielectric substrate with double-sided copper clad layer, one side of the dielectric substrate copper clad layer is a bent line microstrip antenna radiation patch, the other side of the dielectric substrate copper clad layer is a fractal photonic bandgap structure; the bent line microstrip antenna radiation patch The sheet is provided with at least 4 transverse arms and at least 3 longitudinal arms, each transverse arm and each longitudinal arm are alternately connected in series, and the two ends of each longitudinal arm are respectively connected to one end of two transverse arms in a U-shape; The fractal photonic bandgap structure has 3 rows and 3 columns with a total of 9 copper sheets, each row is provided with 3 copper sheets distributed at intervals, and each column is provided with 3 copper sheets distributed at intervals; the rows are parallel to each other, and the columns and The columns are parallel, the copper sheets in each row are parallel, and the copper sheets in each column are parallel.

The invention discloses a compact type plane dual-band omnidirectional circularly polarized antenna. The compact type plane dual-band omnidirectional circularly polarized antenna is characterized by comprising a plane radiating antenna, a center shorting pin, an input connector and a feed probe; the plane radiating antenna sequentially comprises a capacitor chip, a medium substrate I, a radiating chip, a medium substrate II and a floor from top to bottom, and an air layer is arranged between the radiating chip and the medium substrate II; the capacitor chip is connected with an inner conductor of the input connector through the feed probe, protection holes are arranged at corresponding positions on the radiating chip and the floor, the feed probe penetrates through the positions on the radiating chip and the floor, and inner diameters of the protection holes are larger than the diameter of the feed probe; and the radiating chip is composed of a primary round radiation chip and three groups of radiating units which are of same structures, the three groups of radiating units are loaded on the periphery of the primary round radiation chip and composed of six arc vibrators, and each group of radiating units is composed of two arc vibrators with different length. The antenna has the advantages of being good in omnidirectional radiation, good in circular polarization in the ranges of 360 degrees on a plane and flexible in dual-band ratio.

The invention discloses a wearable combined ultra-wide band antenna, mainly solving the problems that the conventional antenna cannot cover an ultra-wide frequency band and the radiation pattern is asymmetrical. The wearable combined ultra-wide band antenna consists of a radiating element (1), antenna dielectric (2), a floor (3) and a coaxial line (4), wherein the antenna dielectric is made of human clothes; the radiating element is vertically fixed on the surface of the clothes; the floor is symmetrically fixed at the bottom of the clothes at a position where the radiating element is vertically fixed; the radiating element and the floor are connected with an internal core and an external core of the coaxial line respectively and are used for feeding electricity; the radiating element consists of three layers of button-type metal bodies; a first layer (101) is a hollow cylinder which is provided with rectangular through holes at the bottom and symmetrical nicks on two sides; a second layer (103) is a hollow cuboid; a third layer (104) is a cylinder provided with through holes; and the coaxial line feeds electricity to the radiating element through a circular hole (301) in the center of the floor. The wearable combined ultra-wide band antenna can cover the ultra-wide frequency band and has good radiation pattern property.

The invention discloses a vertically polarized ceiling omnidirectional antenna. The vertically polarized ceiling omnidirectional antenna includes: a reflector; a short-circuit monopole, the short-circuit monopole includes a central portion and a plurality of radiation portions, and the inner end of each radiation portion is connected to the central portion And each of the radiating parts extends away from the central part, and the short-circuit monopole is arranged above the reflector; there are a plurality of short-circuit legs, and the plurality of short-circuit legs correspond to a plurality of short-circuit legs one by one. The radiating part is connected, each of the short-circuit legs is connected to the reflector; and a first coaxial cable, the first coaxial cable includes a first outer conductor and a first inner conductor, and the first The outer conductor is connected to the reflection plate, and the first inner conductor passes through the reflection plate and is connected to the central portion of the short-circuit monopole. The vertically polarized ceiling omnidirectional antenna according to the embodiment of the present invention has the advantages of simple structure, easy processing and production, low cost, low profile, and small volume.

A photonic band gap ceramic Sierpinski fractal antenna used in a radio frequency identification system relates to a microstrip antenna, in particular to a photonic band gap ceramic Sierpinski fractal antenna used in a radio frequency identification system. The invention provides a photonic band gap ceramic Sierpinski fractal antenna which is used in a radio frequency identification system and is characterized by small size, wide bandwidth, low return loss and omnidirectional radiation property. The antenna is provided with a ceramic substrate, both two sides of the ceramic substrate are provided with a silver coating respectively, wherein, the silver coating on one side is a Sierpinski fractal antenna radiation patch, and the silver coating on the other side is an antenna ground plane, the antenna ground plane is provided with a rectangular hole array photonic band gap structure, and antenna feed points are arranged on the Sierpinski fractal antenna radiation patch.

The invention provides a three-frequency Koch fractal ring mirror image dipole antenna, relates to a dipole antenna and provides a three-frequency Koch fractal ring mirror image dipole antenna with small size, large bandwidth, relatively low return loss, omnidirectional radiation characteristic, an mirror image structure, symmetrical Koch fractal rings and a bent structure. Three frequencies cover the common frequency bands ranging from 745 to 1,067 MHz and from 2,215 to 2,647 MHz of a radio frequency identification device (RFID) and the frequency band ranging from 1,617 to 1,912 MHz of mobile communication. A substrate is arranged; both sides of the substrate are coated with metal layers in which symmetrical Koch fractal rings and the bent structure which are provided with mirror image structures are taken as two dipole arms; the dipole arms are taken as radiation patches of the three-frequency Koch fractal ring mirror image dipole antenna; and two layers of antenna structures form asimilar array.

The invention relates to a dipole antenna, in particular to a double-frequency imaging fractal dipole antenna with small size, large bandwidth, lower echo loss and universal radiation characteristic. The double-frequency imaging fractal dipole antenna is provided with a basal plate, wherein both sides of the basal plate are covered by metal layers, two pairs of dipole arms are symmetrically arranged on one metal layer in an imaging mode; either dipole arm is a dipole antenna radiation patch in a 3 / 2 fractal curve structure; and the other metal layer is in a rectangular array photon band gap structure. The invention can achieve the aim of miniaturizing an RFID antenna so that the RFID antenna can be put in an RFID label or a reader-writer; and the invention also has the advantages of smallsize, wide bandwidth, good universal radiation characteristic, simple structure, simple manufacture process, low cost, easy integration, and the like and can satisfy the concrete requirements of an RFID application system for antennae.

The invention provides a photo strip-gap ceramics Kontol fractal micro-strip antenna for radio frequency identification system, relates to a micro-strip antenna. The photo strip-gap ceramics Kontol fractal micro-strip antenna for radio frequency identification system has small size, large bandwidth, lower return loss and omnidirectional radiation feature. The micro-strip antenna comprises a ceramic wafer and silver coatings are set on the two surfaces of the ceramic wafer, wherein one silver coating is Kontol fractal wireless radiation patch and another silver coating is rectangular-hole array photo strip-gap structure. The relative dielectric constant of the ceramic wafer is 9+-10%. The shape of the ceramic wafer is rectangle and the side length of the square ceramic wafer is 20mm+-1mm and the length thereof is 1.0mm+-0.05mm. The photo strip-gap ceramics Kontol fractal micro-strip antenna for radio frequency identification system has features of small size, large bandwidth, lower return loss, good omnidirectional radiation feature and easy to integrate. The antenna can satisfy the concrete requirement of a RFID application system to the antenna.