35results about How to "Good omnidirectional radiation characteristics" patented technology

The invention discloses a broad band low profile conic sleeve monopole antenna which comprises a monopole (1), a conic top loading sleeve (2), a top loading disc (3), a floor (6), first short circuit probes (4), a second short circuit probe (5) and a radio frequency interface unit (8). The monopole (1) is placed perpendicularly to the floor (6). The top loading disc (3) is placed at the top of the monopole (1). The top loading disc (3) and the monopole (1) are connected through screws. The top loading disc (3) is used for top loading to the monopole (1). The top loading disc (3) and the floor (6) form a short circuit through four first short circuit probes (4). A conic sleeve is added to the monopole so that circular ring top loading is performed to the sleeve, and therefore impedance bandwidth of the antenna is broadened effectively and the dimension of the antenna is reduced.

The invention discloses a slit antenna, a parameter regulation method and a terminal thereof, which belong to the field of antennae. The slit antenna comprises a floor, a coupling piece and a feeding point, wherein a half-sealed notch area is formed at one side of the floor; the coupling piece is positioned in the half-sealed notch area, and slits are formed among the coupling piece and the bottom wall and the side wall of the half-sealed notch area; and the feeding point is positioned in the slit formed between the coupling piece and the side wall. The method comprises the step of regulating the size of the slit, the size of the half-sealed notch area, the size of the coupling piece and at least one in the number of the layers of the coupling piece so as to obtain a corresponding resonant frequency and a corresponding bandwidth. The terminal comprises the slit antenna. The invention enables current to be evenly distributed on the floor, has better property of omnidirectional radiation, smaller antenna size and smaller occupied area of a basal plate and can retain more areas for arranging other components.

The invention relates to a small-sized coplanar waveguide fed ultra-wide band antenna, and belongs to the technical filed of wireless communication. The small-sized coplanar waveguide fed ultra-wide band antenna comprises a rectangular FR4 dielectric slab with the dielectric constant being 4.6, a first step-type microstrip structure, a second step-type microstrip structure, a double-arch-bridge type microstrip structure, a moon-shaped microstrip structure, a rectangular microstrip structure, a rectangular microstrip feedline, a first arc-slope-shaped microstrip structure and a second arc-slope-shaped microstrip structure, wherein the first step-type microstrip structure, the second step-type microstrip structure, the double-arch-bridge type microstrip structure, the moon-shaped microstrip structure and the rectangular microstrip structure form a radiation sticker with a small semi-circular groove, a big semi-circular groove and a rectangular groove; the first arc-slope-shaped microstrip structure and the second first arc-slope-shaped microstrip structure form a common ground structure; a gap is formed between the first arc-slope-shaped microstrip structure and the rectangular microstrip feedline as well as between the second arc-slope-shaped microstrip structure and the rectangular microstrip feedline, so that coplanar waveguide is formed. The small-sized coplanar waveguide fed ultra-wide band antenna provided by the invention is simple in structure, compact in size, low in cost, high in precision, wide in frequency band, good in radiation characteristic, easy to integrate and suitable for small and portable ultra wide band terminal equipment.

The invention discloses an omnidirectional antenna used for a router and an omnidirectional-antenna device used for the router. The omnidirectional-antenna device includes an antenna support rod, an antenna, a first reflector, a second reflector and a power divider. The bottom end of the antenna support rod is connected with a host of the router in a rotatable manner. The first reflector, the second reflector, the antenna and the power divider are installed on the antenna support rod. The first reflector and the second reflector are conical reflectors, the upper ends and lower ends of which are all open. A small open end of the first reflector faces downwards and a small open end of the second reflector faces upwards. The omnidirectional antenna used for the router targets at defects of the prior art and a slot antenna theory, a geometrical diffraction theory and a rotating field theory are used to design the novel omnidirectional antenna. The antenna is better in double-frequency impedance characteristic and better in omnidirectional radiation characteristic in a work frequency and has the advantages of being simple in structure, wide in frequency band, minisize and high in gain and has popularization values.

The invention relates to a novel tri-wave trapping UWB (Ultra Wide Band) antenna which comprises a partial metal earth plate (10), a dielectric substrate (20), an antenna radiation patch (30), a 50-ohm feeder line (31) and three L-shaped groove EBG (Electromagnetic Band Gap) structural units (40,50,60). The three L-shaped groove EBG structural units (40,50,60) which are different in size are respectively coupled with the 50-ohm feeder line (31) of a round monopole UWB antenna, so that signals of three frequency bands, namely WIMAX (World Interoperability for Microwave Access) (3.3GHz-3.6GHz) and WLAN (Wireless Local Area Network) (5.15GHz-5.35GHz, 5.725-5.825GHz), are effectively filtered out while the miniaturization, wide band and favorable radiation characteristic of the antenna are ensured. The antenna has a favorable omnidirectional radiation characteristic in a whole frequency band, and is stable in gain effect, favorable in wave trapping characteristic and applicable to the field of UWB wireless communication.

The invention discloses a dipole antenna with single zero point compensation. The dipole antenna comprises a dielectric substrate, and a dipole antenna and a microstrip yagi antenna which are arrangedon the dielectric substrate. According to the dipole antenna, dipole arms are arranged on the front surface and the back surface of the dielectric substrate; the dipole arms on the front surface andthe back surface of the dielectric substrate are connected; the dipole arm on the front surface of the dielectric substrate and the dipole arm on the back surface of the dielectric substrate adopt a double-array symmetrical structure; the dipole antenna can perform omnidirectional radiation on an H surface, and a feed port is led out of the dipole antenna; and the microstrip yagi antenna is used for compensating a radiation zero point of the E surface of the dipole antenna in a strong directivity manner in the direction of a director of the microstrip yagi antenna. The dipole antenna with single zero point compensation can achieve the purposes that the antenna is suspended above the space, and the radiation range covers the periphery and the lower portion of the whole space.

The invention relates to an UWB (ultra wide band) antenna with WLAN (wireless local area network) dual-notch property, and relates to the field of UWB wireless communication. The UWB antenna comprises a partial metal grounding plate (10), a medium substrate (20), an antenna radiating patch (30), a 50 ohm feeder line (31) and two L-shaped groove EBG (electromagnetic band gap) structure units (40 and 50). The two L-shaped groove EBG structure units (40 and 50) with different sizes can be respectively coupled with the 50 ohm feeder line (31) of a regular hexagon-shaped UWB antenna, so the miniaturizing, UWB and good radiating properties of the antenna are guaranteed, and the signals of two frequency bands (5.15-5.35GHz and 5.725-5.825GHz) of the WLAN can be effectively filtered. The UWB antenna has the advantages that the antenna has good all-bearing radiating property and stable gain effect in the full frequency band, the notch property is good, and the antenna is suitable for the UWB wireless communication system.

The invention relates to a dual-notch UWB (ultra wide band) antenna based on a CLV-EBG (CLV-electromagnetic band gap) structure, and relates to the field of UWB wireless communication. The dual-notch UWB antenna comprises a partial metal grounding plate (10), a medium substrate (20), an antenna radiating patch (30), a 50 ohm feeder line (31) and two corner via mushroom-like CLV-EBG structure units (40 and 50). The two corner via mushroom-like CLV-EBG structure units (40 and 50) with different size parameters can be respectively coupled with the 50 ohm feeder line (31) of a regular hexagon-shaped UWB antenna, so the miniaturizing, UWB and good radiating properties of the antenna are guaranteed, and the signals of two frequency bands, namely WIMAX (worldwide interoperability for microwave access) and WLAN (wireless local area network), can be effectively filtered out. The dual-notch UWB antenna has the advantages that the antenna has good all-bearing radiating property and stable gain effect in the full frequency band, the notch property is good, and the antenna is suitable for the UWB wireless communication system.

The invention discloses an ultra wide band antenna with trapped wave features. The ultra wide band antenna comprises a medium base plate (1), a radiation unit (2), a coplane waveguide signal feeding belt line (3) and a coplane waveguide grounding surface (4), wherein a U-shaped groove (5) is formed in the signal feeding belt line. The radiation unit, the coplane waveguide signal feeding belt line and the coplane waveguide grounding surface are printed on the upper surface of the medium base plate, the radiation unit is positioned in the middle part of the medium base plate, the coplane waveguide signal feeding belt line is led to the radiation unit from the medium base plate from the edge of the medium base plate and is connected with the radiation unit, the coplane waveguide grounding surface consists of two approximately trapezoidal metals, the two approximately trapezoidal metals are respectively and fixedly arranged at the two sides of the coplane waveguide signal feeding belt line, and gaps are formed between the metals and the belt line. The ultra wide band antenna has the advantages that the structure is compact, the dimension is small, the structure is ingenious, the trapped wave frequency can be regulated through changing the dimension and the position of the U-shaped groove, and the problem of same-frequency interference of an ultra wide band communication system is solved.

The present invention discloses a broadband high-gain CTS omnidirectional antenna which comprises a cylindrical metal matrix and a collinear antenna array, the collinear antenna array is composed of eight antenna radiation units, each antenna radiation unit is realized by adopting an annular CTS radiation branch knot, each annular CTS radiation branch knot is realized by adopting a multi-stage stepped impedance converter, eight annular grooves with the same size are formed in the outer side wall of the cylindrical metal base body, the eight antenna radiation units are arranged in the eight annular grooves in a one-to-one correspondence mode, and a coaxial input waveguide power divider adopting a parallel feed mode is arranged in the cylindrical metal base body, and is used for feeding quasi-TEM waves with uniformly distributed amplitude and phase to the eight antenna radiation units in an equal-amplitude and same-direction manner, and the eight antenna radiation units respectively radiate the quasi-TEM waves fed to the eight antenna radiation units to a free space to form a uniform spherical field; and the broadband high-gain CTS omnidirectional antenna has the advantages of being simple to process, small in insertion loss, ultra-wideband (the relative bandwidth can reach 40%), stable and high in gain.