Millimetre wave antennas using an array of lenses


  1. Poirier, J.C.R.
  2. Moffat, J.
  3. Morin, G.
  4. Antar, Y.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
One technique to increase the gain of a single radiating element is to use a conventional lens supported above a microstrip patch element. This configuration allows modification of both the inside and the outside surface curvatures of the lens. The frequency band studied is 43.5-45.5 GHz. Four different lens types have been investigated using simulation software. Two lens types have been designed and fabricated, a plano-convex lens to validate the simulation software and a meniscus lens to validate the results of the most positioning lens. During this research, it was demonstrated that when using a lens above a radiating element, the gain is effectively increased. As a starting point, for a single element without a lens, the measured gain was 5.1 dB. From laboratory measurements, the gain while using a plano-convex lens with the straight face facing the radiating element was 13 dB, an increase of 7.9 dB compared to the measured single element. Using a meniscus lens, based on the same design criteria as the plano-convex lens, the gain increase was 9.1 dB. for an array of 4 elements using a four plano-convex lens array, a 9 dB increase in gain from 8.2 dB to 17.2 dB was measured. A major observation while doing measurement was the impact of the reflected signal from the inside surface of the lens. In the case of the meniscus lens, a gain fluctuation of 2.3 dB was observed when the lens-to-patch distance changed by 1.5 mm.
Report Number
DREO-TR-2000-081 — Technical Report
Date of publication
01 Dec 2000
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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