Millimetre wave antennas using an array of lenses

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Authors
  1. Poirier, J.C.R.
  2. Moffat, J.
  3. Morin, G.
  4. Antar, Y.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
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
104
DSTKIM No
CA010486
CANDIS No
514965
Format(s):
Hardcopy;Document Image stored on Optical Disk

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