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

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.

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 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 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.

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 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.