Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q21/00—Antenna arrays or systems
  • H01Q21/0006—Particular feeding systems
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q21/00—Antenna arrays or systems
  • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
  • H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
  • H01Q9/04—Resonant antennas
  • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
  • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
  • H01Q9/285—Planar dipole

Definitions

• the present invention relates to a microstrip printed dipole antenna for use in electronic devices such as wireless communication device, radar, electronic navigation device and electronic countermeasure device, etc., and particularly to a microstrip printed dipole broad-band antenna having a compound structure.
• the microstrip dipole antenna is widely used in the antenna systems of communication, radar, electronic navigation, etc., due to its characteristics of compact structure, wide frequency range, small volume, light weight, convenient fabrication, etc.
• the frequency bandwidth in which the resistance changes with the frequency and the main lobe half-power bandwidth of the antenna pattern are two important quality parameters.
• many creations focused on the problem of how to broaden the bandwidth of the broad band.
• the main lobe width of a dipole antenna pattern BW3db generally only reaches the level of 60° ⁇ 80°.
• the work efficiency of the antenna array is reduced due to the cross coupling created among the antennas.
• the technical problems to be solved by the present invention are how to improve the half-power bandwidth of the microstrip antenna, and how to control the half- power bandwidth of the microstrip antenna efficiently, such that particular half-power bandwidth values can be obtained at different spatial positions according to requirement of different applications.
• the present invention provides a microstrip printed dipole antenna, comprising a ground plate and at least one microstrip dipole unit connected with the ground plate; the dipole unit including a dielectric substrate, a dipole arm and a balanced- unbalanced transformer (balun), wherein, said dipole arm is located on one side surface of said dielectric substrate, and said balun is located on the other side surface of said dielectric substrate, a feeding point connected with the inner core of a coaxial connector is disposed on the surface of said balun; and compound units disposed on both sides of said dipole arm, and further compound units disposed on both sides of said balun; the compound units disposed on both sides of said balun being connected with the compound units disposed on both sides of said dipole via a metalized hole, and all the compound units being connected with the ground plate.
• balun balanced- unbalanced transformer
• said microstrip antenna Since the compound units in said antenna are printed on the same dielectric substrate with the antenna, said microstrip antenna has the characteristics of simple structure, convenient fabrication, accurate positioning, easy debugging, etc. Also, since the radiation created by the induced current in said compound unit is superposed in space with the radiation created by said antenna dipole arm, the E- plane pattern lobe can be changed easily by changing the position and size of said compound units, thereby the antenna pattern is changed, and the scanning angles of E- and H-planes and 45° plane are improved.
• FIG. 1 is a side view of a structure according to an embodiment of the present invention.
• FIG. 2 is a front view of a structure according to an embodiment of the present invention.
• FIG. 3 is a rear view of a structure according to an embodiment of the present invention.
• FIG. 4 is a front view of a dipole unit in a structure according to another embodiment of the present invention.
• FIG. 5 is a rear view of a dipole unit in a structure according to another embodiment of the present invention.
• FIG. 6 is a side view of a structure according to another embodiment of the present invention.
• FIG. 7 a further side view of a structure according to another embodiment of the present invention.
• FIG. 8 is a pattern of the present invention with the compound units incorporated.
• FIG. 9 is a standing wave testing graph of the embodiment of the present invention.
• FIGs. 1-3 show an embodiment of a compound microstrip printed dipole broadband antenna, which comprises a microstrip dipole unit in this embodiment.
• a microstrip dipole unit 2 is standing on a ground plate 1.
• said microstrip dipole unit 2 includes a dielectric substrate 21, a dipole arm 22 and a balun 23 (as shown in FIG. 3).
• Said dipole arm 22 and parasitic patches 241, 242 used as compound units are all located on one side surface of the dielectric substrate 21, and the parasitic patches 241 and 242 are located on the two sides of the dipole arm 22, respectively.
• a balun represented by 23 is located on the other side surface of the dielectric substrate 21, and parasitic patches 243 and 244 are also disposed on the two sides of the balun 23, respectively.
• a feeding point 231 is disposed on the balun 23, and the feeding point 231 is connected to a coaxial connector 27.
• At least one metalized hole 253, 254 is also disposed on the parasitic patches 243 and 244, and the metalized hole 253 is communicated with the metalized hole 251 in FIG.
• the dipole unit is fed by the balun 23, and the radiation field created by the radiation current in the dipole arm 22 will be superposed in space with the radiation field created by the induced current in the parasitic patches 241, 242, 243, 244, and the half-power bandwidth of the microstrip antenna is thereby broadened.
• the required half-power bandwidth can be obtained by adjusting the values of the distance d from the parasitic patch edge to the midline z of the dipole arm and the height h of the dipole unit.
• the umbrella shaped dipole arm can be opened to a large angle corresponding to a large height h of the parasitic patch; when a small half- power bandwidth is needed, the umbrella shaped dipole arm can be opened to a small angle corresponding to a small height h of the parasitic patch.
• FIGs. 4-7 show another embodiment of the microstrip printed dipole broadband antenna.
• two " T "-like crossed microstrip dipole units are included.
• each microstrip dipole unit comprises an umbrella shaped dipole arm 22, a dielectric substrate 21 and a balun 23 (as shown in FIG. 5).
• the dipole arm 22 and parasitic patches 241, 242 are all located on one side surface of the dielectric substrate 21, and the parasitic patches 241 and 242 are located on both sides of the dipole arm 22.
• the dipole arm 22 and the parasitic patches 241, 242 are connected to the ground plate via a metal strip 26 (as shown in FIG. 4). At least one of the metalized holes 251 and 252 is disposed on the parasitic patches 241 and
• a balun 23 is located on the other side surface of the dielectric substrate 21, and parasitic patches 243 and 244 are disposed on the two sides of the balun, respectively.
• a feeding point 231 is disposed on the balun 23, and the feeding point 231 is connected with a coaxial connector 27.
• Metalized holes 253, 254 are also disposed on the parasitic patches 243 and 244. The metalized hole 253 is communicated with the metalized hole 251 in FIG. 4 such that the parasitic patches 241 and 243 are connected, and the metalized hole 254 in FIG. 5 is communicated with the metalized hole 252 in FIG. 4 such that 242 and 244 are connected.
• Each dipole unit is provided with a gap 28 along its midline z, such that two microstrip dipole units can be crossed together in "+" shape as shown in FIGs. 6 and 7.
• a dual polarized microstrip antenna is thus constructed by two dipole units thus crossed.
• FIGs. 8-9 are performance testing graphes of a microstrip antenna having parasitic patches working at a frequency range of 2.4 Ghz, with a dielectric substrate dielectric constant of 2.65.
• FIG. 9 is the standing wave testing graph of a compound microstrip printed dipole broad-band antenna.
• the frequency bandwidth of the antenna is still above 0.38 at -1OdB, which is more than 10% of the antenna central frequency 2.4 Ghz. It is obvious that, though the microstrip antenna is added with the parasitic patches, the frequency bandwidth of the antenna is not influenced.
• an antenna array is formed by the microstrip antennas of the present invention
• compound units are added in the dipole unit, and the whole antenna is shielded, and the antenna half-power bandwidth is thereby controlled efficiently.
• the signals emitted by other antennas in the antenna array can be shielded to a certain extent at the same time, and the cross coupling between the antenna units can thus be reduced, and the work efficiency of the antenna is improved.

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• Waveguide Aerials (AREA)
• Variable-Direction Aerials And Aerial Arrays (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=36215720

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Cited By (6)

Families Citing this family (9)

Citations (3)

Family Cites Families (2)

• 2005
  • 2005-01-31 CN CN 200510005023 patent/CN1815811B/zh not_active Expired - Fee Related
• 2006
  • 2006-01-27 WO PCT/IB2006/050295 patent/WO2006079993A1/en not_active Application Discontinuation

Patent Citations (3)

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