Classifications

• • 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
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
  • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/40—Radiating elements coated with or embedded in protective material
• • 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
  • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
• • 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
  • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
  • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element

Definitions

• the present invention relates to a plate type antenna for transmitting and receiving waves of wavelength ⁇ belonging to the band of
• Plate antennas are well known. They are most often formed by a first metal plate forming a ground plane and by one or more other metal plates arranged opposite the ground plane and which constitute the radiating plates. Most often, these two metal plate systems are fixed to the opposite faces of a block of dielectric material thus also ensuring the mechanical connection between the ground plane and the radiating plate or plates.
• a system can become expensive, in particular because of the cost of the high-quality dielectric material when the radiating plate or plates have a relatively large surface.
• An object of the present invention is to provide a plate antenna using air as the dielectric material while avoiding the drawbacks mentioned above, in particular as regards the mechanical structure of the antenna.
• the plate type antenna for transmitting or receiving waves of wavelength ⁇ is characterized in that it comprises:
• bracing means integral with the two plates to maintain the two plates in a predetermined relative position so that the two metallizations are facing one another and the second metallization is opposite the first.
• a plate antenna which may include one or more radiating plates which uses air as a dielectric and which has a suitable mechanical structure since the mechanical connection is made by means of the insulating plates which serve as supports.
• the presence of the recesses in the plate surrounding at least part of the metallizations forming the radiating plate or plates makes it possible to effectively use air as a dielectric in the zone of maximum electronic field. produced by the periphery of the radiating metallization (s). This gives optimal operation of the antenna.
• the second insulating plate of the antenna is provided with a plurality of second metallizations of substantially rectangular shape and the metallizations are electrically connected by connecting portions.
• recesses are also provided in the peripheral zone arranged on the side and on the other, electrical connection elements between the different radiating metallizations.
• FIG. 1 is a vertical sectional view of a first embodiment of the antenna in the case where it comprises a single radiating metallization;
• FIG. 2 is a detail view of Figure 1 showing the lines of electromagnetic fields between the ground plane and the radiating metallization;
• FIG. 3 is a bottom view of the upper plate in the case where it comprises several radiating metallizations
• FIG. 4 is a vertical sectional view of a plate antenna according to the invention comprising several radiating metallizations;
• Figure 5 is a partial view of Figure 3 showing an alternative embodiment of the recesses surrounding the radiating metallizations.
• the antenna comprises a first plate of insulating material 10 of the type used for the manufacture of printed circuits and the thickness of which is preferably between 0.8 and 1.6 millimeters in order to have sufficient mechanical properties.
• metallization is carried out, for example of copper 12, to constitute the ground plane of the antenna.
• This metallization 12 has a generally rectangular shape.
• the antenna also includes a second insulating plate 14 produced with the same insulating material as the plate 10 and whose thickness e is of the same order of magnitude as that of the plate 10.
• metallization is carried out by any suitable technique 16 constituting the radiating plate of the antenna (English-speaking patch).
• the metallization 16 also has a rectangular shape, the dimensions of which are adapted to the frequency band in which the antenna works. Spacers such as 18 and 20 fixed in the parts of the insulating plates 10 and 14 devoid of metallizations ensure rigorous positioning of the two insulating plates and therefore of the ground plane 12 and of the radiating plate 18.
• the antenna is completed by a line supply 22 which is connected respectively to the radiating plate 16 and to the ground plane 12 as is well known.
• the insulating plate 14 is provided with recesses such as 24 and 26 arranged in a peripheral zone surrounding the portion of the insulating plate 14 covered by the metallization 16 for reasons which will be explained in connection with FIG. 2 .
• the insulating plate 10 we find the insulating plate 10, the metallization 12, the insulating plate 14 and the metallization 16 forming a radiating plate.
• the electromagnetic field lines 30 which develop between the conductive plates 12 and 16 are shown in their facing portion, as well as the electromagnetic field lines 32 which are created by the electric current flowing at the periphery. 16a of metallization 16.
• these field lines in the maximum electromagnetic field area created by this periphery 16a are first of all directed towards the insulating support 14.
• This insulating support 14 for reasons of cost , being made with a material with poor dielectric properties, these would reduce the quality of the antenna.
• recesses 24 and 26 are produced around the metallization 16, as will be explained in more detail.
• the electromagnetic field lines emitted by the periphery of the metallization 16 pass through the recesses 24 and 26 in which the dielectric is also constituted by air as is the case between the conductive plates 12 and 16. This thus gives an antenna with very good qualities.
• FIG. 3 we will describe a second embodiment of the antenna in which the radiating part of the antenna is constituted by two metallizations respectively referenced 34 and 36.
• these two metallizations are substantially square in shape and their dimension corresponds to ⁇ / 2, ⁇ being the wavelength in which the antenna works.
• These two metallizations 34 and 36 are electrically connected to each other by an electrical connection portion 38 ensuring electrical continuity between the metallizations 34 and 36.
• a metallization 34 and 36 is defined around each of the connection portions 38. so-called peripheral zone 40 whose width h is substantially equal to ⁇ / 10. It is inside this peripheral zone 40 that the recesses such as 24 and 26 are formed.
• the recesses must occupy the highest possible percentage of the peripheral zone 40 while nevertheless ensuring sufficient mechanical connection between the portions of the insulating plate 14 on which the metallizations are made and the rest of this plate on which the spacers 18 and 20 are fixed. priority, the material constituting the insulating plate must be removed where the amplitude of the electromagnetic field is maximum.
• the density of recesses will be increased along the edges of the conductive plates 34 and 36 corresponding to the presence of a maximum magnetic field and this density will be reduced along the other edges and along the edges of the electrical connection 38.
• slots 42, 44a, 44b, 46a are provided in this peripheral zone 40 , 46b and 48 which correspond to the entire width of the conductive plates.
• FIG 5 there is shown an alternative embodiment of the recesses inside the peripheral zone 40.
• the metallization 34 and the initiation of the electrical connection portion 38 In the parts of the peripheral zone 40 corresponding to the maximum electromagnetic field, there are recesses, for example circular 54 which are very close to each other whereas, along the other two edges of the plate, there are recesses 56 also circular, more spaced apart from one another others in such a way that, overall, we obtain the appropriate mechanical resistance.
• the radiating part of the antenna consisted of more than two conductive plates electrically connected to each other. Neither would one depart from the invention if the conductive plates forming the radiating part of the antenna were not electrically connected, but each included an antenna conductor such as 22.
• the radiating plates are rectangular or square. It goes without saying, however, that we would not depart from the invention if these metallizations were in the form of a circle, polygon, etc.

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Priority Applications (1)

Applications Claiming Priority (3)

Publications (2)

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Family Applications (1)

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• 1998
  • 1998-10-12 FR FR9812727A patent/FR2784506A1/fr not_active Withdrawn
• 1999
  • 1999-10-11 TW TW088117503A patent/TW445666B/zh not_active IP Right Cessation
  • 1999-10-12 WO PCT/FR1999/002449 patent/WO2000022695A1/fr active IP Right Grant
  • 1999-10-12 CN CN99801814A patent/CN1126191C/zh not_active Expired - Fee Related
  • 1999-10-12 EP EP99947543A patent/EP1038333B1/de not_active Expired - Lifetime
  • 1999-10-12 DE DE69926050T patent/DE69926050D1/de not_active Expired - Lifetime
  • 1999-10-12 AT AT99947543T patent/ATE299299T1/de not_active IP Right Cessation
  • 1999-10-12 KR KR1020007006221A patent/KR20010032890A/ko not_active Application Discontinuation
  • 1999-10-12 JP JP2000576510A patent/JP2002527974A/ja active Pending
  • 1999-10-12 ES ES99947543T patent/ES2245516T3/es not_active Expired - Lifetime
  • 1999-10-12 US US09/581,143 patent/US6285326B1/en not_active Expired - Fee Related
  • 1999-10-12 DK DK99947543T patent/DK1038333T3/da active
• 2001
  • 2001-07-26 HK HK01105222A patent/HK1034811A1/xx not_active IP Right Cessation

Non-Patent Citations (1)

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