55results about How to "Improve the direction map" patented technology

The invention provides a high-gain dielectric resonator antenna applied to a 60 GHz millimeter wave communication system, belongs to the technical field of electromagnetic propagation and receiving and provides a high-gain dielectric resonator antenna based on an H-shaped slot fractal uniplanar compact electromagnetic bandgap (HSF-UC-EBG) structure. The specific implementation is that a circle of HSF-UC-EBG structure is loaded around a radiating main body of a dielectric resonator antenna; and the high-gain dielectric resonator antenna is characterized in that the gain in a working frequency range of the antenna is effectively improved under the conditions of keeping size and section of the dielectric resonator antenna unchanged. The designed high-gain HSF-UC-EBG dielectric resonator antenna can be used in the 60 GHz millimeter wave communication system and provides guidance for designing a high-gain antenna which works in a high-frequency system.

The invention discloses a subminiature ultra-wide-band helical antenna which is applied to the technical field of communication. The subminiature ultra-wide-band helical antenna mainly comprises a radiator, a metal cavity, a feed Balun, a feed connector and wave absorbing materials. The radiator comprises plane helical lines, longitudinal helical lines and a medium support. The subminiature ultra-wide-band helical antenna enables the plane helical lines and the longitudinal helical lines to be combined together through the medium support which is sealed at one end and is the shape of a hollow cylinder, so that the band width of the antenna is increased, and meanwhile miniaturization of the antenna is realized. The longitudinal helical lines are connected with the antenna metal cavity through a resistor at the head ends of the longitudinal helical lines and a resistor at the tail ends of the longitudinal helical lines, so that low-frequency standing waves of the antenna and a directional diagram of the antenna are improved; the wave absorbing materials are arranged inside the metal cavity in a filling mode, so that the directional diagram, within the frequency band of the antenna and the circular polarization performance, within the frequency band, of the antenna are improved; due to the fact that an antenna cover is added, the use stability of the antenna is improved, and the service life of the antenna is prolonged. The subminiature ultra-wide-band helical antenna has the advantages of being ultra-wide in band, circularly polarized, wide in lobe, miniaturized and the like, and has broad application prospects.

To provide a speaker for reproducing ultrahigh frequencies which outputs ultrahigh frequencies up to 100 kHz with stable sound pressure. A speaker for reproducing ultrahigh frequencies of the present invention comprises a schematically disk-shaped piezoelectric ceramic vibrator wherein a piezoelectric ceramic and a metal substrate are bonded; a dome-shaped diaphragm attached to said piezoelectric ceramic vibrator; and a panel which fixes an outer peripheral part of said piezoelectric ceramic vibrator and has an opening part in a front face of said dome-shaped diaphragm, wherein the diameter of the dome part of said dome-shaped diaphragm is made to be 0.5 to 0.8 times the effective. movable diameter of said piezoelectric ceramic vibrator.

The invention discloses a portable double-offset-parabola antenna which comprises a main reflecting face, an auxiliary reflecting face, a main-reflecting-face supporting device, an auxiliary-reflecting-face fixing device, a feed source system, a feed source supporting device and a servo motor. The main reflecting face is fixed to the main-reflecting-face supporting device, the auxiliary reflecting face is fixed to the main-reflecting-face supporting device through the auxiliary-reflecting-face fixing device, the servo motor is fixed to the position below the main-reflecting-face supporting device, the feed source system is fixed to the main-reflecting-face supporting device through the feed source supporting device, and the main reflecting face is of a transverse elliptic structure, that is, the width of the main reflecting face is larger than the height of the main reflecting face. Compared with an existing Gregory antenna, the performance of the antenna is guaranteed; meanwhile, the portable double-offset-parabola antenna has the advantages that the focal length is small, the caliber is small, a feed source is small, and the performance is excellent; the portable double-offset-parabola antenna has the structural advantages of being simple in structure, light in weight, easy to machine and low in cost.

The invention discloses an ultra-wideband dual-polarized radiation unit. The antenna comprises a radiating element, a metal ring and a feed element. The metal ring is annularly arranged at the periphery of the radiating element. The radiating element comprises a first dipole and a second dipole which are arranged in a crossed manner. The first dipole and the second dipole respectively comprise tworadiation arms which are arranged diagonally. The feed element comprises a first transmission line and a second transmission line which are electrically isolated. The first transmission line is coupled with the first dipole, and the second transmission line is coupled with the second dipole. According to the invention, the standing-wave ratio and the directional diagram of the radiating element are improved. The bandwidth and the gain of the radiating element are increased. The ultra-wideband design is realized. The radiating element is rotationally and symmetrically arranged around the central position of the radiating element by 90 degrees, so that the structure is compact. The dislocation problem of the antenna in the batch production and assembly process can be avoided. The batch production efficiency is improved. In addition, the invention also discloses an ultra-wideband dual-polarized antenna.

The invention provides an UWB (ultra wide band) antenna with a dual resistance band function, and relates to an UWB antenna. The UWB antenna comprises a medium substrate (105), a radiating unit (101), an impedance matching input microstrip wire (102), a folding line type EBG (electromagnetic band gap) structure (103), a cross type EBG structure (106) and a metal grounding plate (104), wherein the radiating unit (101), the impedance matching input microstrip wire (102), the folding line type EBG structure (103) and the cross type EBG structure (106) are arranged on the medium substrate, and the metal grounding plate (104) is arranged under the medium substrate. The UWB antenna has the advantages that by utilizing the radiating unit, the impedance matching input microstrip wire and the metal grounding plate, the pass band bandwidth required by the UWB is realized; by arranging the two groups of EBG structures, the dual resistance band property is realized; the two resistance bands are respectively arranged near 5.2GHz and 6.8GHz, and the interference of an UWB system on an RFID (radio frequency identification) system (6.8GHz) and a WLAN (wireless local area network) system (5.15-5.35GHz) is inhibited.

The invention relates to a dual-stopband UWB (Ultra-wide Bandwidth) antenna with steep stopbands, relating to a UWB antenna. The dual-stopband UWB antenna with the steep stopbands, is formed by a dielectric substrate (105), a radiating element (101) above the dielectric substrate, a square etching fractal structure (107), an impedance matching input microstrip line (102), a fold line type EBG (Electromagnetic Band Gap) structure (103), a criss cross EBG structure (106) and a metal earth plate (104) under the dielectric substrate. According to the dual-stopband UWB antenna with the steep stopbands, the radiating element, the impedance matching input microstrip line and the metal earth plate are utilized to realize passband width required by UWB, and the dual-stopband characteristic of the steep stopbands is realized by utilizing the two groups of EBG structures and the square etching fractal structure above the radiating element. According to the antenna provided by the invention, the two stopbands are respectively close to 5.2Ghz and 6.8GHz, so that the interference of a UWB system on an RFID (Radio Frequency Identification Device) system (6.8GHz) and a WLAN (Wireless Local Area Network) system (5.15-5.35GHz) is restrained.

This invention relates to a plane helical microstrip aerials in 3G system mobile terminal, the character of which is that the dimension is small, strip width is up to 250MHz, which can cover all the transmitting-receiving frequency band plane helical microstrip aerials in 3G system mobile terminal. And the mircrostrip aerials al has the double faced medium base board, one face is the spiral medium base board, the other face is the photon with interval medium base board, the base board is 4.9-5.1cm*4.9-5.1cm; on the spiral medium base board there arranges two arms, two borders of the arm are composed of spirals whose original angles' errand is pi / 2, and the clearance between two spiral original lines is 0.2-0.4cm, the distance from the spiral original line to the spiral terminal line is 1.2-1.4cm; on the photon with interval medium base board there arranges 6 rectangle holes of 2 rows and 3 lists, the length of three rectangle holes in the 1 rows are all 2.1-2.3cm,and the length of three rectangle holes in the 2 rows are all 1.5-1.7cm. The width of the 1,2,3 list is 0.8- 1.0,1.3-1.5,1.4-1.6cm.

The invention provides an ultra-wideband electromagnetic combination TEM horn antenna and a parameter determination method thereof. The ultra-wideband electromagnetic combination TEM horn antenna comprises a [-shaped square frame, a TEM horn upper arm, a TEM horn lower arm, a parasitic branch, a dielectric gasket, an SMA connector and a boss, wherein a current passes the SMA connector and is fed into the TEM horn antenna, a feed end of the TEM horn upper arm is connected with an inner core of the SMA connector, the dielectric gasket is filled between an upper arm transition section and a lowerarm transition section, the [-shaped square frame, the TEM horn upper arm and the parasitic branch enclose to form a closed magnetic ring, and the current flows through the parasitic branch to causeshunting. The ultra-wideband electromagnetic combination TEM horn antenna optimizes the high-frequency split lobe of the TEM antenna by adopting an upper and lower arm elliptical gradation manner, sothat the high-frequency gain is improved; the low-frequency radiation is enhanced by means of the arc-shaped parasitic branch, and the low-frequency bandwidth is expanded; the maximum radiation direction is adjusted by adopting the asymmetric design of heights of the upper and lower arms, so that the beam is kept in the x-axis direction; and the transition sections are used for replacing a balun,and the dielectric gasket is used for adjusting the transition impedance, so as to achieve the effect that the antenna bandwidth is greater than 20 octaves.

The invention provides a slot array loading four-unit multi-frequency high-isolation microstrip MIMO antenna and relates to the field of research of antennas in passive devices. The four-unit antenna unit is provided with a T-shaped feed coupling line port, and a slot array is periodically loaded on a radiation patch to realize polarization diversity, so that the antenna isolation is improved, the four-unit MIMO antenna system inhibits coupling among antennas, excites more resonance frequency points and improves a high-order mode directional diagram, and the size of the antenna is greatly reduced; the coupling feeder line and the radiation unit adopt microstrip lines, so that the section of the antenna is low and the antenna is easy to process; and the designed antenna has multi-frequency point frequency working characteristic and stable polarization diversity characteristic, and a dielectric substrate is low in price and easy to buy, in a word, the slot array loading four-unit multi-frequency high-isolation microstrip MIMO antenna is low in manufacturing cost and easy to process, realizes batch production and has a great actual application value.

The present invention relates to a MIMO antenna array and a reflective substrate thereof. A high-frequency radiation unit array or isolation plate located in an isolation region can isolate two hybridradiation unit arrays located in a first installation area and a second installation area to improve isolation. Further, by adjusting the distance between an adjustment plate and the high-frequency radiation unit array (or isolation plate), the combination boundary of the adjustment plate and the high-frequency radiation unit array (or isolation plate) cancels out the reflection boundary asymmetry caused by the reflective substrate, thereby improving the boundary symmetry of the hybrid radiation unit arrays and further improving the directional diagram of the MIMO antenna array. In addition,the adjustment plate is placed under a low-frequency radiation arm in a high-low frequency nested radiation unit, and can improve the boundary symmetry of the low-frequency radiation unit in the high-low frequency nested radiation unit, thereby improving a low-frequency standing wave and the isolation. Therefore, the directional diagram indicators and the circuit indicator of the MIMO antenna array are improved.

The invention discloses a UWB (ultra-wideband) band-notch antenna with a steep stop band and relates to a UWB band-notch antenna. The UWB band-notch antenna comprises a dielectric substrate (105), a radiating element (101), a square etching fractal structure (106), an impedance matching input microstrip line (102) and a cross type EBG (Electromagnetic Band Gap) structure (103) which are arranged on the dielectric substrate, and a metal ground plate (104) which is arranged under the dielectric substrate. According to the UWB band-notch antenna, the pass band width, which conforms to UWB requirements, is implemented through the radiating element, the impedance matching input microstrip line and the metal ground plate, and the steep stop band is formed by utilizing the cross type EBG structure (103) and the square etching fractal structure on the radiating element. The stop band of the antenna related by the invention is close to 6.8 Ghz, so that the mutual interference with an RFID (Radio Frequency Identification Device) system (6.8 Ghz) is avoided.

The invention discloses a novel attenuation band steep UWB (Ultra Wide Band) band-notch antenna, and relates to an UWB band-notch antenna. The novel attenuation band steep UWB band-notch antenna is formed by a dielectric substrate (105), a radiation unit (101) on the dielectric substrate, a Sierpinski triangular fractal structure (106), an impedance matching input micro-strip line (102), a cross-shaped EBG (Electromagnetic Band Gap) structure (103) and a metal grounding plate (104) under the dielectric substrate. According to the novel attenuation band steep UWB band-notch antenna disclosed by the invention, passband width required by UWB can be realized by utilizing the radiation unit, the impedance matching input micro-strip line and the metal grounding plate, and a steep attenuation band is formed by utilizing the cross-shaped EBG structure (103) and the Sierpinski triangular fractal structure on the radiation unit; the frequency of an antenna attenuation band is about 6.8Ghz, and the mutual interference with an RFID (Radio Frequency Identification device) system (the frequency is 6.8Ghz) is avoided.

The invention relates to a small single-polarization radiating unit. The small single-polarization radiating unit comprises an integrally formed radiating unit body, wherein the radiating unit body comprises a vibrator grounding base positioned at the bottom, two upward extending vibrator balancers which are arranged at intervals and perpendicular to the vibrator grounding base, and closed-loop vibrators which are respectively and vertically arranged on the outer sides of the upper end parts of the two vibrator balancers; the small single-polarization radiating unit further comprises a parasitic vibrator plate arranged above the vibrator balancers and the closed-loop vibrators; the vibrator plate spans above the two closed-loop vibrators through an insulating bracket. The small single-polarization radiating unit has a unique structure, can further improve the electrical properties, is small in size and small in overall consumable items, can reduce the cost, is more convenient for assembly, improves the efficiency, can realize a multisystem antenna between smaller intervals, greatly reduces the size of the whole antenna, and is easier to realize the miniaturization of antenna products.

The invention discloses a dual-frequency dual-polarization planar antenna applied to a wireless local area network. The dual-frequency dual-polarization planar antenna applied to the wireless local area network comprises a reflecting plate, a +45 degrees polarized port, a -45 degrees polarized port, a first 2.4G one-to-two circuit board, a second 2.4G one-to-two circuit board, first to second 5G one-to-four circuit boards, a first division frequency integrated circuit board and a second division frequency integrated circuit board; wherein the reflecting plate is equipped with first to second 2.4G radiation oscillators and first to fourth 5G radiation oscillators; the first division frequency integrated circuit board is equipped with a first 2.4G frequency band input port, a first 5G frequency band input port, a first division frequency integrated circuit and a first dual frequency band output port; and the second division frequency integrated circuit board is equipped with a second 2.4G frequency band input port, a second 5G frequency band input port, a second division frequency integrated circuit and a second dual frequency band output port. The dual-frequency dual-polarization planar antenna applied to the wireless local area network has the advantages of small volume, low cost, simple structure and installation, good performance indexes, which can improve the radiation efficiency of the antenna.

A speaker is provided that is operable to reproduce ultrahigh frequencies. Specifically, the speaker outputs ultrahigh frequencies up to 100 kHz with stable sound pressure. The speaker may include a disk-shaped piezoelectric ceramic vibrator wherein a piezoelectric ceramic and a metal substrate are bonded; a dome-shaped diaphragm attached to the piezoelectric ceramic vibrator; and a panel that fixes an outer peripheral part of the piezoelectric ceramic vibrator.

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 provides a UWB (ultra wide band) band-notch antenna with a steep stop band, and relates to a UWB band-notch antenna. The antenna is composed of a dielectric substrate (105), a radiating element (101) arranged on the dielectric substrate, a square etching fractal structure (106), an impedance matching input microstrip line (102), a fold line type EBG (Electromagnetic Band Gap) structure (103) and a metal grounding plate (104) below the dielectric substrate. The UWB band-notch antenna with the steep stop band disclosed by the invention realizes the bandpass width required by UWB by using the radiating element, the impedance matching input microstrip line and the metal grounding plate, and forms the steep stop band by using the fold line type EBG structure and the square etching fractal structure on the radiating element. The antenna stop band that the invention relates to is near 5.2 GHz, which avoids the mutual interference with a WLAN (Wireless Local Area Network) system (5.15-5.35 GHz).

The invention relates to a novel EBG (electromagnetic band gap) structured ultra-wide-band wave-trapping antenna, and relates to the ultra-wide-band wave-trapping antenna, wherein the wave-trapping frequency band of the antenna is an RFID frequency band. The antenna comprises a dielectric substrate (105), and a radiation unit (101), an impedance matching input microstrip line (102) and a broken-line type EBG structure (103) which are arranged on the dielectric substrate, and a metal grounding plate (104) below the dielectric substrate. The passing band bandwidth of the UWB (ultra wide band) requirement can be realized through the radiation unit, the impedance matching input microstrip line and the metal grounding plate; and the band-stop characteristic is realized through the EBG structure. The stop band of the antenna provided by the invention is 6.8GHz, so that the mutual interference between the antenna and an RFID system (6.8GHz) is avoided.

A stop band steep dual-notch UWB antenna relates to a UWB band-stop antenna of which the notch frequency band is located at the WLAN and RFID frequency bands, and is composed of a dielectric substrate (105), a radiation unit (101) on the dielectric substrate, an impedance matching input microstrip line (102), a cross-shaped electromagnetic band gap (EBG) structure (103), an EBG structure (107) shaped like a Chinese character mi and a metal grounding plate (104) under the dielectric substrate. The stop band steep dual-notch UWB antenna of the present invention realizes the passband bandwidth required by the UWB by utilizing the radiation unit, the impedance matching input microstrip line and the metal grounding plate, utilizes the circular radiation unit with a circular fractal structure to improve the stop band attenuation inhibition, and utilizes the EBG structures to realize the band stop characteristic. The stop band of the antenna involved in the present invention is nearby 5.2 GHz and 6.8 GHz, thereby avoiding the mutual interference of a WLAN system and an RFID system.

The invention discloses an ultra wideband band-notch antenna based on a crossed type EBG (Electromagnetic Band Gap) structure, relating to an ultra wideband band-notch antenna. The antenna comprises a dielectric substrate (105), a radiating element (101), an impedance matching input microstrip line (102) and a crossed type EBG structure which are arranged on the dielectric substrate, and a metal earthing plate (104) arranged under the dielectric substrate. The ultra wideband band-notch antenna realizes passband width required by UWB (ultra wideband) by using the radiating element, the impedance matching input microstrip line and the metal earthing plate, and realizes band stop characteristic by using the crossed type EBG electromagnetic band gap structure. According to the ultra wideband band-notch antenna disclosed by the invention, a stop band is near 6.8Ghz, and the mutual interference with an RFID (Radio Frequency Identification) system is avoided.

An ultra wide band antenna based on an EBG structure relates to an ultra wide band (UWB) band-stop antenna of which the notch frequency band is located at the WLAN and RFID frequency bands, and is composed of a dielectric substrate (105), a radiation unit (101) on the dielectric substrate, an impedance matching input microstrip line (102), an EBG structure (103) shaped like a Chinese character mi, a broken line type EBG structure (107) and a metal grounding plate (104) under the dielectric substrate. The ultra wide band antenna based on the EBG structure of the present invention realizes the passband bandwidth required by the UWB by utilizing the radiation unit, the impedance matching input microstrip line and the metal grounding plate, utilizes the circular radiation unit with a Sierpinski triangular fractal structure to improve the stop band attenuation inhibition, and utilizes the EBG structures to realize the band stop characteristic. The stop band of the antenna involved in the present invention is nearby 5.2 GHz and 6.8 GHz, thereby avoiding the mutual interference of a WLAN system and an RFID system.

A novel dual-stop band UWB antenna relates to the UWB band-stop antenna of which the notch frequency band is located at the WLAN and RFID frequency bands, and is composed of a dielectric substrate (105), a radiation unit (101) on the dielectric substrate, an impedance matching input microstrip line (102), a cross-shaped electromagnetic band gap (EBG) structure (103), an EBG structure (107) shaped like a Chinese character mi and a metal grounding plate (104) under the dielectric substrate. The novel dual-stop band UWB antenna of the present invention realizes the passband bandwidth required by the UWB by utilizing the radiation unit, the impedance matching input microstrip line and the metal grounding plate, utilizes the circular radiation unit with a rhombic fractal structure to improve the stop band attenuation inhibition, and utilizes the EBG structures to realize the band stop characteristic. The stop band of the antenna involved in the present invention is nearby 5.2 GHz and 6.8 GHz, thereby avoiding the mutual interference of a WLAN system and an RFID system.

The invention provides a radome, and belongs to the technical field of radar radome electrical properties. The first-order influence on an antenna system can be reduced by the radome so that the guidance precision of the aircraft can be enhanced. The radome comprises a radome body and an internal structure. A 3mm sponge layer is arranged on the radome body. A copper layer of 20-40 microns is arranged on a dielectric layer. The copper layer surface has a hexagonal or pentagonal structure. The overall shape of the radome has a two-dimensional curve structure. The internal structure is constructed by wood trusses and provided with reinforcing ribs of which the mechanism is shaped like a Chinese character "jing". When a metal conductive screen is loaded on the radome, the directional diagram of the radar antenna can be improved, i.e. the antenna gain loss can be reduced and the antenna beam deviation can be reduced so that guidance precision of the aircraft can be enhanced. The reinforcing ribs are used so that the overall structure is enabled to be more stable without increasing resistance, and the radome has the thin, light, wide and strong technical characteristics.

According to an ultra-wideband antenna and equipment provided by the embodiment of the invention, a main radiation unit (2) and a microstrip line feed unit (3) of the ultra-wideband antenna are arranged on the front surface of a dielectric substrate (1), and the microstrip line feed unit (3) is electrically connected with the main radiation unit (2). The grounding plate (4) is arranged on the back surface, opposite to the front surface, of the dielectric substrate (1); and at least one part of the feed unit (15) is expanded from a preset position to the tail end (6) of the microstrip line feed unit (3) or the tail end (16) of the grounding plate (4). The embodiment of the invention further provides equipment, the ultra-wideband antenna can improve the standing-wave ratio and the directional diagram in an antenna band, and the working bandwidth of the antenna is expanded.

Embodiments of the present invention provide an antenna device and a terminal, which relate to the communication field and can restrain the direction of "ground" current on the edge of the single board where the antenna is located. Including: the antenna, the single board provided with the antenna, and also: the first area provided on the single board without the metal layer, wherein the first edge of the single board is the longer of the two single board edges close to the antenna on the edge of the veneer; on the first edge, the point with a distance of λ / 4 from the first maximum current point on the first edge is the first stronghold; wherein, the first maximum current point is the distance on the first edge from The current maximum point nearest to the feeding point of the antenna, λ is the operating wavelength of the antenna; the first area without the metal layer includes the first stronghold, and the maximum distance from the edge of the first area to the first edge of the veneer is The distance is λ / 4.

A UWB band-stop antenna based on an EBG structure relates to the UWB band-stop antenna of which the notch frequency band is located at the WLAN and RFID frequency bands, and is composed of a dielectric substrate (105), a radiation unit (101) on the dielectric substrate, an impedance matching input microstrip line (102), a crisscross EBG structure (103), a broken line type EBG structure (107) and a metal grounding plate (104) under the dielectric substrate. The UWB band-stop antenna based on the EBG structure of the present invention realizes the passband bandwidth required by the UWB by utilizing the radiation unit, the impedance matching input microstrip line and the metal grounding plate, utilizes the circular radiation unit with a rhombic fractal structure to improve the stop band attenuation inhibition, and utilizes the EBG structures to realize the band stop characteristic. The stop band of the antenna involved in the present invention is nearby 5.2 GHz and 6.8 GHz, thereby avoiding the mutual interference of a WLAN system and an RFID system.

A stop band steep dual-stop band UWB antenna relates to a UWB band-stop antenna of which the notch frequency band is located at the WLAN and RFID frequency bands, and is composed of a dielectric substrate (105), a radiation unit (101) on the dielectric substrate, an impedance matching input microstrip line (102), a cross-shaped electromagnetic band gap (EBG) structure (103), an EBG structure (107) shaped like a Chinese character mi and a metal grounding plate (104) under the dielectric substrate. The stop band steep dual-stop band UWB antenna of the present invention realizes the passband bandwidth required by the UWB by utilizing the radiation unit, the impedance matching input microstrip line and the metal grounding plate, utilizes the circular radiation unit with a Sierpinski triangle fractal structure to improve the stop band attenuation inhibition, and utilizes the EBG structures to realize the band stop characteristic. The stop band of the antenna involved in the present invention is nearby 5.2 GHz and 6.8 GHz, thereby avoiding the mutual interference of a WLAN system and an RFID system.

A UWB antenna based on an EBG structure relates to a UWB band-stop antenna of which the notch frequency band is located at the WLAN and RFID frequency bands, and is composed of a dielectric substrate (105), a radiation unit (101) on the dielectric substrate, an impedance matching input microstrip line (102), an EBG structure (103) shaped like a Chinese character mi, a broken line type EBG structure (107) and a metal grounding plate (104) under the dielectric substrate. The UWB antenna based on the EBG structure of the present invention realizes the passband bandwidth required by the UWB by utilizing the radiation unit, the impedance matching input microstrip line and the metal grounding plate, utilizes the circular radiation unit with a rhombic fractal structure to improve the stop band attenuation inhibition, and utilizes the EBG structures to realize the band stop characteristic. The stop band of the antenna involved in the present invention is nearby 5.2 GHz and 6.8 GHz, thereby avoiding the mutual interference of a WLAN system and an RFID system.

The invention relates to a novel EBG (electromagnetic band gap) structured ultra-wide-band band-stop antenna, and relates to the ultra-wide-band band-stop antenna taking a WLAN frequency band as the band-stop frequency band. The antenna comprises a dielectric substrate (105), and a radiation unit (101), an impedance matching input microstrip line (102) and a broken-line type EBG structure (103) which are arranged on the dielectric substrate, and a metal grounding plate (104) below the dielectric substrate. The passing band bandwidth of the UWB (ultra wide band) requirement can be realized through the radiation unit, the impedance matching input microstrip line and the metal grounding plate; and the band-stop characteristic is realized through the EBG structure. The stop band of the antenna provided by the invention is 5.1-5.4GHz, so that the mutual interference between the antenna and a WLAN system (5.15-5.35GHz) is avoided.