(19)
(11) EP 1 069 646 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.07.2001 Bulletin 2001/27

(43) Date of publication A2:
17.01.2001 Bulletin 2001/03

(21) Application number: 00305729.6

(22) Date of filing: 06.07.2000
(51) International Patent Classification (IPC)7: H01Q 9/04, H01Q 5/00
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 10.07.1999 GB 9916146

(71) Applicant: ALAN DICK & COMPANY LIMITED
Cheltenham, Gloucestershire GL52 6UT (GB)

(72) Inventor:
  • Davies, Richard Simon Greville
    Cheltenham GL52 3BA (GB)

(74) Representative: Dunlop, Brian Kenneth Charles et al
c/o Wynne-Jones, Lainé & James 22 Rodney Road
Cheltenham Gloucestershire GL50 1JJ
Cheltenham Gloucestershire GL50 1JJ (GB)

   


(54) Patch antenna


(57) An antenna for radiating at a plurality of frequencies including a ground plane (1) serving as a reflector against which a patch (2) is electrically driven. A further patch (3) is stacked above the first patch (2) and is intended to resonate at a frequency in the upper frequency band and utilises the first patch (2) as its ground plane. The lower patch (2) is driven from voltage sources (4a, 4b, 5a and 5b) established on the ground plane (1) and connected to the patch (2) by means of probe wires (10a-d) and series capacitors (8a-d) formed within the patch. Similarly, the upper patch (3) is driven by voltage sources (6a, 6b, 7a, 7b) established in the lower frequency patch and connected by respective wire probes (11a-d) and series capacitors (9a-d) within the upper frequency patch. Respective lines joining the pairs of points are orthogonal.






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