Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
  • H01Q13/10—Resonant slot antennas
  • H01Q13/18—Resonant slot antennas the slot being backed by, or formed in boundary wall of, a resonant cavity ; Open cavity antennas
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/12—Supports; Mounting means
  • H01Q1/1271—Supports; Mounting means for mounting on windscreens
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/27—Adaptation for use in or on movable bodies
  • H01Q1/32—Adaptation for use in or on road or rail vehicles

Definitions

• the invention relates to an antenna, in particular a vehicle antenna for mobile radio, according to the features of the preamble of patent claim 1.
• An antenna preferably a vehicle antenna for mobile radio
• a vehicle antenna for mobile radio is known from DE 199 22 699 A1.
• vertical radiators are provided as radiation means, which are arranged on a ground surface and are connected to one another via an impedance transformation line. Because of the coordination (in particular length) of the vertical radiators and the impedance transformation line for the intended frequency range, in particular in the mobile radio range from 0.8 to 2.2 GHz, this known antenna has predetermined length and height dimensions. Since this antenna is integrated below a rear window of a vehicle, it requires a large installation space due to its geometric dimensions, which is either not available or is undesirably reduced by the interior of the vehicle.
• a further disadvantage is that a coaxial cable for signal transmission is soldered directly to the ground surface, the inner conductor of the coaxial cable being connected to the impedance transformation line. This creates a complex structure, which has the particular disadvantage that prior to the installation of the antenna, this has a cable tail, which causes problems in handling the prefabricated antennas before they are installed.
• the invention is therefore based on the object of providing an antenna, in particular a vehicle antenna for mobile radio, with which the disadvantages described at the outset are avoided.
• a radiation region that is open on both sides and has a longitudinally slit is excited as a radiation medium in several frequency ranges. Because of this, it is possible for the antenna to be more compact with the same properties, in particular to be significantly shorter (approximately by half) and flatter. This means that the available space under the rear window or on the roof flange of the vehicle can be used much better and more economically.
• the length of the antenna corresponds to approximately one third of the wavelength of the lowest frequency.
• the longitudinally slotted conductive area has a double bend in a partial area.
• the double-kinked slot for example with the shape of a funnel, ensures great broadband capability and thus makes the spotlight robust against installation tolerances.
• the longitudinally slotted conductive regions together form a tapering slit. This provides a flat vertical radiator for the required frequency range (s) in a simple manner.
• the tapered slot emanates a further slot which branches off, in particular approximately in the middle, and which separates the longitudinally slotted conductive regions from one another.
• the impedance of the antenna can be adapted in wide or additional areas. For optimum impedance matching and also for optimal use of area, the leg of the angled slot starting from the tapering slot is shorter than the adjoining slot area.
• the areas in the direction in which no radiation is to take place are shielded by a housing body, in particular a sheet metal.
• This metal housing body prevents radiation from entering the interior of the vehicle.
• the body which extends at least over the area of the circuit board, but can also be larger or smaller, at least a substantial reduction in radiation into the interior of the vehicle is realized.
• the longitudinally slotted conductive areas are arranged as a copper surface on a circuit board.
• by methods known per se e.g. etching processes
• the branching slot is designed such that no direct current short circuit occurs at the base of the antenna. Because of this, the antenna can be checked electrically for functionality or for existing faults before it is installed. By avoiding the DC short circuit, only a simple test resistor has to be connected in parallel at the feed point. The coupling capacitor required for conventional slot radiators can be omitted. This simplifies construction and lowers costs.
• a contact partner in particular a plug, is arranged in the base of the antenna on the circuit board.
• the contact partner can already be provided on the circuit board when the antenna is manufactured, without a cable being required at this time.
• a cable can be temporarily connected via the contact partner. After the test, the cable can be removed again, so that the transport and storage of the antenna is simplified until it is finally installed.
• Corresponding cabling only takes place with or after the antenna is installed in the vehicle.
• FIG. 1 a three-dimensional view of a prefabricated antenna
• FIG. 2 shows a sectional view of an antenna according to FIG. 1 at its installation location.
• FIG. 1 shows an antenna 1 for receiving and transmitting high-frequency signals, in particular in the mobile radio areas AMPS, GSM 900/18000, PCS, UMTS and the like.
• the antenna 1 shown is in particular a vehicle antenna, although other fields of application, including static uses, are also conceivable.
• the antenna 1 has a metal housing body, which consists of a multi-angled plate 2.
• a metal housing body which consists of a multi-angled plate 2.
• Such an angled plate 2 is inexpensive on the one hand in terms of material costs, and on the other hand it is quick and easy to manufacture. This has a positive effect on the manufacture of the antenna 1 according to the invention.
• the board 3 has a base made of a non-conductive material in a manner known per se.
• a plurality of conductive regions 4 to 6 are arranged on this base area of the circuit board 3, which are produced, for example, by covering the later conductive regions 4 to 6 and etching away the uncovered intermediate regions.
• first slot 7 which is created on the one hand by the shape of the area 4 and on the other hand by the shape of the areas 5 and 6.
• second slot 8 which in turn separates the two areas 5 and 6 from one another. If the second slot 8 is omitted, the two areas 5 and 6 form a continuous area, the second slot 8 extends approximately from the center of the first slot 7 and initially extends at right angles from this over a short distance, while the longer part of the second slot 8 is approximately parallel to the first slot 7.
• the conductive area 5 is provided with a double bend 9.
• a contact partner in particular a plug 11, to which a coaxial cable for feeding the antenna 1 can be inserted.
• the legs of the plate 2 which are spaced apart parallel to one another, have a plurality of punching and bending regions 12, by means of which the circuit board 3 is fixed to the housing basic body.
• punch-bending areas 12 have the advantage; that they are easy to manufacture and thus the board 3 can be quickly fixed to the housing body 2.
• FIG. 2 shows the antenna 1 shown in FIG. 1 in a three-dimensional view in section at its installation location.
• the rear window 14 connects, which is fastened to the roof flange 13 by means of an adhesive (bead of adhesive 15).
• an adhesive bead of adhesive 15
• the installation location of the antenna .1 which can be kept particularly flat due to the inventive design of the antenna 1.
• the antenna in particular the vehicle antenna for mobile radio, is thus designed in summary as a radiating open cavity resonator with a specially designed broadband slot in order to achieve the most compact, in particular flat and short, construction possible.

Landscapes

• Waveguide Aerials (AREA)
• Support Of Aerials (AREA)
• Control Of Motors That Do Not Use Commutators (AREA)
• Details Of Aerials (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7709379

Family Applications (1)

Country Status (6)

Families Citing this family (12)

Family Cites Families (16)

• 2002
  • 2002-11-13 EP EP02792761A patent/EP1454381B1/fr not_active Expired - Lifetime
  • 2002-11-13 AT AT02792761T patent/ATE447245T1/de not_active IP Right Cessation
  • 2002-11-13 WO PCT/EP2002/012692 patent/WO2003052873A1/fr active Application Filing
  • 2002-11-13 DE DE50213971T patent/DE50213971D1/de not_active Expired - Lifetime
  • 2002-11-13 JP JP2003553664A patent/JP2005513847A/ja active Pending
  • 2002-11-13 US US10/467,658 patent/US7019705B2/en not_active Expired - Lifetime

Non-Patent Citations (1)

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