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 discloses a compact type conformal PIFA array antenna working on a UHF frequency band. The compact type conformal PIFA array antenna working on the UHF frequency band is characterized by comprising a plurality of small-scale inverted-F-shaped antenna units, a horizontal antenna array which is composed of the inverted-F-shaped antenna units, a feed network and working frequency adjusting branches, the compact type conformal PIFA array antenna is printed on a flexible dielectric slab, and finally the flexible dielectric slab is bent and is arranged on the outer side face of a dielectric cylinder in a conformal mode to form a conformal radiator so as to achieve omnidirectional radiation. Repeated 90-degree bending operation of the inverted-F-shaped antenna units is adopted by the compact type conformal PIFA array antenna to achieve a low profile of the compact type conformal PIFA array antenna working on the UHF frequency band, and the overall height of the compact type conformal PIFA array antenna working on the UHF frequency band is about 0.06 lambda, wherein the lambda represents the air wave length. Due to the fact that the compact type conformal PIFA array antenna is arranged on the outer side face of the dielectric cylinder in a conformal mode, the sectional area of the compact type conformal PIFA array antenna can be reduced, and the compact type conformal PIFA array antenna can be installed in a narrow space. Due to the fact that the advantages that the inverted-F-shaped antenna units are convenient to manufacture, high in accuracy and low in cost are made full use of by the compact type conformal PIFA array antenna, miniaturization and the low profile of the compact type conformal PIFA array antenna working on the UHF frequency band are achieved, and high gain and the good omnidirectional radiation characteristic are achieved.

The invention discloses a dual trapped wave flat ultra wideband antenna which consists of a medium substrate (1), a radiation unit (2) and a signal feed band wire (3), wherein a circular complementation opening resonance ring (CSRR) structure (4) is arranged on the radiation unit; the signal feed band wire is provided with a U-shaped slot (5); the radiation unit and the signal feed band wire are both printed at the upper surface of the medium substrate; the radiation unit is positioned in the middle of the medium substrate; a feeder is led to the radiation unit from the margin of the medium substrate and connected with the same, and a grounding surface is printed at the lower surface of the medium substrate. The dual trapped wave flat ultra wideband antenna is compact in structure and small in size; trapped wave frequency can be regulated by changing the size and position of the U-shaped slot and the circular complementation opening resonance ring (CSRR) structure, and the problem of same frequency interference of an ultra wideband communication system is solved.

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 relates to a dual-notch UWB (ultra wide band) antenna based on a Mushroom-EBG (electromagnetic band gap) structure. 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 Mushroom-EBG structure units (40 and 50). The two Mushroom-EBG structure units (40 and 50) with different size parameters are respectively coupled with the 50 ohm feeder line (31) of a regular hexagon-shaped UWB antenna, so 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 disclose a double-notch ultra-wideband antenna, which comprises a dielectric substrate (1), a radiating element (2), a coplanar metal grounding plate (3), and a microstrip feeder (4), wherein double T-shaped filters (22, 23) are introduced onto the radiating element (2), rectangular complementary split-ring resonator (CSRR) structure grooves (31, 32) are formed in the grounding plate (3), the radiating element (2) is arranged on the upper middle part of the dielectric substrate (1), the microstrip feeder (4) is led to the radiating element (2) from the lower edge of the dielectric substrate (1) and is connected with the radiating element (2), and the grounding plate (3) is composed of two unfilled-corner rectangular metal plates which are positioned on two sides of the microstrip feeder (4) and equal in distances to the microstrip feeder (4). The double-notch ultra-wideband antenna adopts a coplanar waveguide feeding method, realizes ultra wideband by utilizing oval-like patches, and realizes notch features at the WiMAX (3.3-3.7GHz) and WLAN (5.15- 5.825GHz) frequency bands by utilizing the double T-shaped filters (22, 23), the grounding plate and the rectangular complementary split-ring resonator structure grooves. The double-notch ultra-wideband antenna can effectively reduce the mutual interference among the ultra-wideband system, the WLAN system and the WiMAX system, and realizes cooperative communication.

The invention relates to an ultra wide band H-type cross type dielectric resonator antenna, which comprises a dielectric substrate, a metal floor, and a direct micro-strip feeder line and a monopole antenna on the dielectric substrate, wherein a crossed H-type dielectric resonator is put on the dielectric substrate; due to the cross-type structure, the H-type dielectric resonator is embedded on two sides of the dielectric substrate; the monopole antenna is arranged in an open pore in the lower end of the front face of the dielectric resonator; the upper end of the direct micro-strip feeder line is connected with the monopole antenna; and a terminal of the direct micro-strip feeder line is connected with a coaxial connector. The ultra wide band H-type cross type dielectric resonator antenna has a simple structure, a smaller size and larger wide band, can effectively cover frequency requirement regulated by FCC (Federal Communications Commission), i.e. 3.1-10.6GHz, has good directionality and higher gain and emission efficiency, and is very suitable for miniaturization development demand and application of modern ultra wide band wireless communication.

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 relates to an ultra-wide-band omnibearing low-profile discrete embedded dielectric resonator antenna which comprises a dielectric substrate, two equilateral triangle dielectric resonators with the same size, a rectangular monopole and a coplanar waveguide feeding system. A groove of which a size is equal to that of each dielectric resonator is formed at the upper part of the dielectric substrate so as to carry out embedded installation; the lower layer dielectric resonator is embedded into the dielectric substrate so as to reduce a height of a profile; the rectangular monopole not only is used as an antenna, but also is used as an excitation source to be inserted between two layers of dielectric resonators; two symmetric ground planes with sunken parts are positioned at bothsides of the coplanar waveguide feeding system; a 50 omega straight micro-strip feeder line is arranged in the middle of the coplanar waveguide feeding system; the upper end of the coplanar waveguidefeeding system is connected with the rectangular monopole; and a terminal of the coplanar waveguide feeding system is connected with a coaxial joint. The antenna covers a frequency band range of 3.44to 10.85GHz, has a stable gain and high radiation efficiency on the overall working frequency band, and has a profile height of only 1.524mm.

The invention discloses a novel UWB (Ultra Wide Band) antenna with a tri-wave trapping characteristic. The novel UWB antenna is characterized by comprising a dielectric substrate , wherein metallic conductor surfaces are printed on the same side of the dielectric substrate; a rectangular radiating element structure, a coplanar waveguide feeder line and incomplete ground planes are positioned in the dielectric substrate; three similar U-shaped grooves are etched in the rectangular radiating element, so that such a structure can generate trapped waves of three frequency bands; the left and right sides of the feeder line are provided with the partial ground planes; a micro coplanar waveguide feeding mode is adopted for feeding.

The invention relates to an ultra-wide fractal antenna of coplanar wave-guide feeding in the wireless communication technique, which comprises: a radiation element, a coplanar wave guider, a dielectric plate, and a feeding port. Wherein, said radiation element and coplanar wave guider are in one surface of dielectric plate while the radiation element is connected to one end of coplanar wave guider and another end of coplanar wave guider is connected to the feeding port; the radiation element has n layers of radiation unit while the first layer is in round paster; digging out the internal triangle whose center is the circuit center of said round paster, and using the first layer of radiation element as initial structure, the n layers are shortened via the n-order replace factor to be added into the radiation element with n-1 layers, while the radiation element uses the longitudinal axle of coplanar wave guider as symmetry axle. The invention can be used in ultra-wide band communication system with tight structure and small volume, while it can be integrated into the print circuit board and have uniform distribution in 360 degrees of whole ultra-wide band frequency field.

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.

An ultra-wideband antenna compatible with a WLAN system belongs to the field of wireless communication. The existing ultra-wideband antenna is not mature technologically and has crowded frequency spectrum. According to the ultra-wideband antenna compatible with a WLAN system, one side plate of a dielectric substrate (1) is printed with a micro-strip feeder (2) and an elliptical adjusting branch (3), the other side plate of the dielectric substrate (1) is printed with a metal patch (4) having an elliptic hole (5), the inside of the elliptic hole (5) is printed with a micro-strip adjust branch (6) and an elliptic metal patch (7) from outside to inside, and a metal connecting bridge (8) is arranged between the edge of the elliptic hole (5) and the periphery of the micro-strip adjust branch (6). Compatibility between the ultra-wideband antenna and the WLAN system is realized. The problem of crowded frequency spectrum can be fully solved through wide high frequency band. The ultra-wideband antenna has the advantages of low profile, compact structure, small weight, low cost, and easy integration.

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 discloses a four-notch ultra-wideband antenna which comprises a dielectric substrate, a radiation unit, a microstrip feeder and a metal ground layer, wherein the radiation unit and the microstrip feeder are arranged on one surface of the dielectric substrate, and the metal ground layer arranged on the other surface of the dielectric substrate. One end of the microstrip feeder is connected with the radiation unit, and the other end of the microstrip feeder extends towards the lower edge of the dielectric substrate along the length direction of the dielectric substrate, the radiation unit is provided with a first slot and a second slot which are used for forming two different notch frequency bands, two sides of the microstrip feeder are provided with two first parasitic branches and two second parasitic branches which are used for forming the other two different notch frequency bands, and the first slot and the second slot are a symmetrical structure relative to the longitudinal central axis of the microstrip feeder. The two first parasitic branches and the two second parasitic branches are symmetrically distributed on the two sides of the microstrip feeder respectively. According to the ultra-wideband antenna, mutual interference between a UWB communication system and four narrowband communication systems can be avoided at the same time, the notch performance is good, notches are mutually independent, and debugging is convenient.

The invention discloses an ultra-broadband antenna with notched characteristic. The ultra-broadband antenna comprises a dielectric substrate (1), a radiating element (2), a coplanar waveguide signal feed strip line (3) and a coplanar waveguide ground plane (4), wherein a horn-shaped groove (5) is formed in the radiating element, and two E-shaped grooves (6) are formed in the coplanar waveguide ground plane. The radiating element, the coplanar waveguide signal feed strip line and the coplanar waveguide ground plane are printed on the upper surface of the dielectric substrate; the radiating element is located at the middle part of the dielectric substrate, the coplanar waveguide signal feed strip line is led to the radiating element from the edge of the dielectric substrate and is connected to the radiating element; the coplanar waveguide ground plane is formed by two pieces of trapezoidal metals, which are respectively fixed on two sides of the coplanar waveguide signal feed strip line and are spaced with the coplanar waveguide signal feed strip line. The ultra-broadband antenna has the advantages of compact structure and compact size, through changing the size and the position of an epsilon-type groove, the notched frequency is adjusted, and the problem of the same frequency interference of an ultra-wideband communication system is solved.

The embodiment of the invention discloses an omnidirectional high-gain antenna based on meta-material. The omnidirectional high-gain antenna comprises an upper copper foil substrate and a circuit board supporting the upper copper foil substrate. The upper copper foil substrate is composed of multiple strip lines. Each strip line is composed of an upper grounding plate, a lower grounding plate anda metal conduction band. The upper grounding plate is printed on the upper copper foil substrate. The lower grounding plate is embedded in the circuit board. The metal conduction band connects the upper grounding plate and the lower grounding plate. The length of the metal conduction band is greater than half of the length of the upper grounding plate and greater than one third of the length of the lower grounding plate. The circuit board is provided with multiple metalized via holes for piercing of the adjacent metal conduction bands. The consistency and the stability of the antenna can be increased, the assembling process is simple and batch production can be facilitated, and series feeding is performed through multiple alternate feed strip lines so as to have high gain and great omnidirectional radiation characteristic.

A single-polarization low-out-of-roundness indoor distribution antenna comprises a top radiation unit, a vertical polarization radiation unit and a grounding plate. The vertical polarization radiation unit comprises a plurality of radiation patches which are distributed in a circumferential array by taking the center of the grounding plate as a circle center, and each radiation patch is arranged in an extending manner along the vertical direction; the outer side of each radiation patch is provided with at least one notch; the top radiation unit comprises a first circular patch and a second circular patch which are arranged up and down; by means of the six radiation patches distributed in the circumferential array, the out-of-roundness of the antenna is improved while the high-gain radiation characteristic of the antenna is maintained, and the frequency resonance points of the antenna are increased and the bandwidth is expanded by forming the two notches in the radiation patches; the out-of-roundness of vertical polarization radiation is improved through the first circular patch and the second circular patch which are arranged at an interval; impedance matching of the antenna is improved through the arc-shaped hole of the grounding plate, and good omnidirectional radiation characteristics of the antenna are maintained.

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.

This application belongs to the field of antenna, and discloses a slot antenna, a terminal and a method for adjusting a parameter of the slot antenna. The slot antenna includes a board, a coupling chip and a feed point. A semi-closed slot area is formed on one side of the board. The coupling chip is located in the semi-closed slot area, and forms a slot with a lower wall and a side wall of the semi-closed slot area. The feed point is located in the slot formed between the coupling chip and the side wall. The method includes: adjusting at least one of the size of the slot, the size of the semi-closed slot area, the size of the coupling chip, and the number of layers of the coupling chip so as to obtain the corresponding resonant frequency and bandwidth. The terminal includes the slot antenna. The present invention enables the uniform distribution of the current on the board, thus achieving better omni-directional radiation feature, and the antenna size is smaller, thus occupying smaller area on a baseboard and leaving more area for other components.

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.

The invention discloses a dual ellipse combined monopole antenna fed by a gradual change coplanar waveguide, which consists of a dielectric substrate, a double ellipse combination radiation unit printed on the same side of the medium substrate, a gradual change coplanar waveguide, and a floor with a ladder structure and external coaxial connectors. The double ellipse combined radiating unit is composed of upper and lower semi-ellipses with different long and short axis lengths and an axial ratio of 1.25. A round hole is opened in the middle of the unit to adjust the bandwidth matching. It is fed through a gradual coplanar waveguide to reduce radiation loss and adjust the input impedance. The floor adopts a ladder structure to form multi-resonance, broadband and good omnidirectionality. radiation properties. The antenna has the characteristics of wide frequency band, miniaturization, simple structure, convenient processing, easy conformal, etc. The effective working bandwidth is 2.4-12.6 GHz, the radiation characteristic is stable, and it is suitable for short-distance broadband communication.

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, and a fractal triangular structure (6) is etched on the radiation unit. 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 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 invention provides a slot dipole antenna which is easy to process and produce, small in size, hidden and attractive. The slot dipole antenna consists of a metal plate, two strip-shaped slots and a radio frequency feed end; the antenna is a planar slot antenna; and in the metal plate, the grounding end and the excitation end of the radio frequency feed end are connected with edges, with the longest distance from each other, of the two strip-shaped slots respectively. The efficiency and radiation capability of the slot dipole antenna in each direction are close to those of a conventional slot antenna; and in addition, the actual size of the slot dipole antenna is greatly reduced, and the slot dipole antenna is attractive and can satisfy development tendency of the antenna.

The invention discloses a high-gain omnidirectional antenna, which comprises an upper microwave dielectric substrate (1a) and a lower microwave dielectric substrate (1b), wherein multiple sections of alternately-fed strip lines are printed on the microwave dielectric substrate; each section of strip line consists of an upper metal grounding plate (2a), a lower metal grounding plate (2b) and a metal conduction band (3); the upper metal grounding plates (2a) are printed on the upper surface of the upper microwave dielectric substrate (1a); the lower metal grounding plates (2b) are printed on the lower surface of the lower microwave dielectric substrate (1a); the metal conduction bands (3) are positioned between the upper microwave dielectric substrate (1a) and the lower microwave dielectric substrate (1b); and each metal conduction band is longer than each metal grounding plate and extends to the metal grounding plate of a microstrip line which is adjacent to the metal conduction band; and the metal conduction bands of two adjacent sections of the strip lines are alternately connected with the metal grounding plates through metallized through holes (4). The high-gain omnidirectional antenna disclosed by the invention is favorable in omnidirectional radiation property, simple in assembly process, good in process implementation uniformity and high in reliability.