(19)
(11) EP 2 259 379 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.03.2011 Bulletin 2011/09

(43) Date of publication A2:
08.12.2010 Bulletin 2010/49

(21) Application number: 10163719.7

(22) Date of filing: 24.05.2010
(51) International Patent Classification (IPC): 
H01Q 3/32(2006.01)
H01Q 1/24(2006.01)
 H01P 1/18(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
BA ME RS

(30) Priority: 22.05.2009 IE 20090401

(71) Applicant: Alpha Wireless Limited
Ireland (IR)

(72) Inventors:
  • Lawlor, Fergal
    County Laoise (IE)
  • Trejtnar, Zdenek
    Northampton, Northamptonshire (GB)

(74) Representative: Schütte, Gearoid et al
Cruickshank & Company 8A Sandyford Business Centre Sandyford
Dublin 18
Dublin 18 (IE)

   


(54) A phase shifter


(57) The present invention is directed to a phase shifter comprising a primary printed circuit board (PCB) having at least an arcuate co-centric unconnected double track printed thereon, and, a secondary PCB having printed thereon at least an arcuate co-centric double track connected by a radially extending link track located at neighbouring ends of the double track; whereby, the secondary PCB is rotatably mounted on the primary PCB such that the arcuate co-centric double tracks on both PCBs partially overlap one another so as to be in electrical communication with one another. The advantage of providing arcuate co-centric tracks on the secondary PCB and the primary PCB is that rotation of the secondary PCB may be used to increase the length of the completed track circuit rather than a translational movement of the secondary PCB. Therefore, no additional area on the primary PCB has to be reserved to accommodate the movement of the secondary PCB. A variable phase shifter and a differential phase shifter may also be constructed in analogous manners.







Search report