EP0542447B1 - Antenne à plaque plane - Google Patents

Antenne à plaque plane Download PDF

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Publication number
EP0542447B1
EP0542447B1 EP19920309808 EP92309808A EP0542447B1 EP 0542447 B1 EP0542447 B1 EP 0542447B1 EP 19920309808 EP19920309808 EP 19920309808 EP 92309808 A EP92309808 A EP 92309808A EP 0542447 B1 EP0542447 B1 EP 0542447B1
Authority
EP
European Patent Office
Prior art keywords
probes
ground plane
flat plate
feed network
plate antenna
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19920309808
Other languages
German (de)
English (en)
Other versions
EP0542447A1 (fr
Inventor
Martin Stevens Dr. Smith
Dean Dr. Kitchener
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of EP0542447A1 publication Critical patent/EP0542447A1/fr
Application granted granted Critical
Publication of EP0542447B1 publication Critical patent/EP0542447B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/064—Two dimensional planar arrays using horn or slot aerials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/005—Patch antenna using one or more coplanar parasitic elements

Definitions

  • This invention relates to flat plate antennas (also known as layered antennas) having either directional or omnidirectional field patterns in azimuth with limited elevation radiation patterns.
  • an antenna can be either a single radiating element (e.g. one dipole) or an array of like radiating elements.
  • the antenna includes a second ground plane having the same arrangement of apertures as the first ground plane, wherein the first ground plane, the feed network and the second ground plane together form a triplate structure.
  • a plurality of like radiating elements are formed in alignment in a common ground plane with a common feed network conductor pattern arranged to feed all the probes having one orientation in phase and all the probes having an opposing orientation in antiphase.
  • the antenna may further include a reflector plane spaced from the rear of the antenna.
  • the ground planes may be formed as a stamped aluminium sheet.
  • the feed network and the probes can be formed as a printed circuit pattern on an insulating substrate.
  • the feed network can be separated from a ground plane by means of a foamed dielectric sheet.
  • a method of transmitting microwave signals comprising the steps of providing microwave signals to a pair of colinear probes in antiphase, the feed probes each being associated with a respective aperture in a ground plane spaced at a uniform distance from the probes, whereby each probe radiates through its respective aperture and couples parasitically with the edges of said aperture to thereby determine the beam shape.
  • the flat plate antenna element shown in Figs. 1 and 2 comprises an insulating substrate 10 to one side of which is positioned a metallic ground plane 12 having a pair of identical rectangular apertures 14, 16. On the opposite side of the substrate there is positioned a metallic conductor pattern which consists of a pair of radiating probes 18, 20 and a common feed network 22a, 22b. A feed point 24 is provided for connection to an external feed (not shown).
  • the feed network 22a, 22b is positioned so as to form a microstrip transmission line with portions of the ground plane defining the rectangular apertures. The position of the feed point 24 is chosen so that when an r.f.
  • the relative lengths of the two portions 22a and 22b of the network are such as to cause the pair of probes 18 and 20 to be fed in antiphase, thereby creating a dipole antenna radiating element structure.
  • the dimensions of the rectangular apertures and the bounding portions of the ground plane are chosen so that the bounding portions 26, 28 parallel with the probes 18, 20 act as parasitic antenna radiating elements, which together with the pair of radiating probes 18, 20 shape the radiation pattern of the antenna.
  • Fig. 3 shows a triplate version of the antenna of Figs. 1 and 2 in which a second ground plane 30 identical with ground plane 12 is placed on the other side of the substrate 10.
  • the second ground plane is spaced from the plane of the feed network by dielectric spacing means (not shown) so that the feed network is equally spaced from both ground planes.
  • the feed network can be formed by conventional printed circuit techniques on a fibre glass board and the ground planes can be stamped out of aluminium sheets. Spacing between the network and the ground planes can be determined by foamed dielectric sheets or dielectric studs interposed between the various layers.
  • a metallic back reflector 32 can be attached to the antenna as shown in Fig. 4.
  • FIG. 1 and 2 An experimental single element antenna was constructed as shown in Fig. 1 and 2 using a fibre glass substrate board 10 of 1.6mm thickness on which the feed network 22a, 22b and radiating probes 18, 20 were formed as printed circuitry.
  • the overall antenna width was 80mm and its length was 115mm.
  • Each aperture was 40mm by 60mm.
  • Each probe was 26.5mm long.
  • the feed network was in general 5mm wide but parts of it were only 3mm wide to achieve suitable impedance matching.
  • Fig. 5a shows the measured azimuth radiation pattern for this antenna at a frequency of 1795MHz. It will be noted that a beamwidth of approximately 120° is obtained with a peak gain of 6dBi.
  • a second single element triplate antenna was constructed as shown in Fig. 4 but with a modified feed network.
  • the wide portions of the feed network were 3.5mm and the narrow portions were 2mm wide.
  • the overall dimensions were still 80mm by 115mm and the dimensions of the apertures were again 40mm by 60mm.
  • the back reflector of 40mm width was retained at a spacing of 40mm but the ground plane spacing was changed to 2.4mm and the effective dielectric constant for the structure was equal to unity.
  • the azimuth radiation pattem at 1795 MHz is shown in Fig. 5b.
  • a modified feed network having a central feed point 40 incorporated additional lengths of printed circuit track 42 to provide the necessary phase adjustments for the individual probe feeds. All the probes having one orientation are fed in phase by the network down one side of the array and all the probes having opposite orientation are fed in antiphase by the network on the other side of the array.
  • the element spacing was 115mm (0.69 ⁇ at 1795MHz) and a back reflector was attached as before.
  • the array has a 3dB azimuth beamwidth of approximately 120°, a good front-to-back ratio and a low cross-polar level.

Landscapes

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

Claims (8)

  1. Antenne à plaque plate ayant au moins un élément rayonnant, comprenant :
    un plan métallique de masse (12) ayant deux ouvertures rectangulaires identiques (14, 16) qui sont alignées,
    une paire de sondes colinéaires (18, 20) dépassant chacune en sens opposé et à distance d'une ouverture respective pour la formation d'un dipôle, et
    un dessin conducteur (22a, 22b) de réseau d'alimentation connecté aux sondes et destiné à alimenter celles-ci en opposition de phase, si bien que chaque sonde émet par l'ouverture respective,
    dans laquelle le dessin conducteur du réseau d'alimentation et les sondes sont formés sur un substrat isolant adjacent au plan de masse et à une distance uniforme de celui-ci, les sondes étant des prolongements du dessin conducteur du réseau d'alimentation, et
    le dessin conducteur du réseau d'alimentation est disposé de manière qu'il soit dans l'alignement des parties sans ouvertures du plan de masse avec une configuration à microbandes plates et les dimensions des ouvertures par rapport aux dimensions globales du plan de masse sont telles que les bords des parties du plan de masse qui délimitent les bords des ouvertures parallèles aux sondes agissent comme éléments rayonnants parasites afin qu'ils déterminent ainsi la configuration du faisceau.
  2. Antenne à plaque plate selon la revendication 1, comprenant en outre :
    un second plan métallique de masse (30) ayant une paire d'ouvertures rectangulaires identiques qui sont alignées, et
    le dessin conducteur du réseau d'alimentation est disposé afin qu'il soit dans l'alignement des parties sans ouverture du premier et du second plan de masse dans une configuration à plaque triple.
  3. Antenne à plaque plate selon la revendication 1 ou 2, ayant plusieurs éléments rayonnants formant un ensemble linéaire, les paires de sondes de tous les ensembles rayonnants étant alignées, l'antenne ayant un dessin conducteur de réseau d'alimentation destiné à alimenter en phase toutes les sondes ayant une première orientation et en opposition de phase toutes les sondes ayant une orientation opposée.
  4. Antenne à plaque plate selon l'une quelconque des revendications 1 à 3, comprenant un plan réflecteur (32) placé à distance de l'arrière de l'antenne.
  5. Antenne à plaque plate selon l'une quelconque des revendications 1 à 3, dans laquelle les plans de masse sont formés chacun d'une feuille emboutie d'aluminium.
  6. Antenne à plaque plate selon l'une quelconque des revendications 1 à 3, dans laquelle le réseau d'alimentation et les sondes sont formés par un dessin de circuit imprimé sur un substrat isolant (10).
  7. Antenne à plaque plate selon l'une quelconque des revendications 1 à 3, dans laquelle une entretoise diélectrique de mousse est placée entre le réseau d'alimentation et le plan de masse.
  8. Procédé de transmission de signaux en hyper-fréquences, comprenant une étape de transmission de signaux en hyperfréquences à une paire de sondes colinéaires en opposition de phase, les sondes d'alimentation étant associées chacune à une ouverture respective d'un plan de masse placé à une distance uniforme des sondes, si bien que chaque sonde émet par son ouverture respective et est couplée de manière parasite aux bords de l'ouverture pour déterminer ainsi la configuration du faisceau.
EP19920309808 1991-11-15 1992-10-27 Antenne à plaque plane Expired - Lifetime EP0542447B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9124291 1991-11-15
GB9124291A GB2261554B (en) 1991-11-15 1991-11-15 Flat plate antenna

Publications (2)

Publication Number Publication Date
EP0542447A1 EP0542447A1 (fr) 1993-05-19
EP0542447B1 true EP0542447B1 (fr) 1996-01-24

Family

ID=10704680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920309808 Expired - Lifetime EP0542447B1 (fr) 1991-11-15 1992-10-27 Antenne à plaque plane

Country Status (4)

Country Link
EP (1) EP0542447B1 (fr)
JP (1) JPH0645820A (fr)
DE (1) DE69207865T2 (fr)
GB (1) GB2261554B (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0667649B1 (fr) * 1994-02-10 1998-09-30 Nortel Networks Corporation Antenne
GB9410994D0 (en) * 1994-06-01 1994-07-20 Alan Dick & Company Limited Antennae
GB2299898B (en) * 1995-04-13 1999-05-19 Northern Telecom Ltd A layered antenna
GB2300760A (en) 1995-04-13 1996-11-13 Northern Telecom Ltd A layered antenna
GB2308012B (en) 1995-12-05 1999-11-17 Northern Telecom Ltd A radiation shielding device
GB2312791A (en) * 1996-05-02 1997-11-05 Northern Telecom Ltd Antenna array assembly
US6539608B2 (en) 1996-06-25 2003-04-01 Nortel Networks Limited Antenna dielectric
EP0914237A1 (fr) * 1996-06-25 1999-05-12 Nortel Networks Corporation Dielectrique d'antenne
DE19712510A1 (de) 1997-03-25 1999-01-07 Pates Tech Patentverwertung Zweilagiger Breitband-Planarstrahler
AUPP415698A0 (en) * 1998-06-17 1998-07-09 Royal Melbourne Institute Of Technology Antenna device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1364941A (en) * 1972-01-05 1974-08-29 Secr Defence Aerials
FR2487588A1 (fr) * 1980-07-23 1982-01-29 France Etat Doublets replies en plaques pour tres haute frequence et reseaux de tels doublets
CA1323419C (fr) * 1988-08-03 1993-10-19 Emmanuel Rammos Antenne reseau planar a lignes d'alimentation coplanaires a guide d'ondes jumelees aux ouvertures d'un plan de sol
JPH0456502A (ja) * 1990-06-26 1992-02-24 Matsushita Electric Works Ltd 平面アンテナ
GB9002636D0 (en) * 1990-02-06 1990-04-04 British Telecomm Antenna
EP0445453A1 (fr) * 1990-03-07 1991-09-11 Stc Plc Antenne

Also Published As

Publication number Publication date
GB2261554B (en) 1995-05-24
GB9124291D0 (en) 1992-01-08
EP0542447A1 (fr) 1993-05-19
JPH0645820A (ja) 1994-02-18
DE69207865T2 (de) 1996-10-02
DE69207865D1 (de) 1996-03-07
GB2261554A (en) 1993-05-19

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