Vol. 1, issue 12, article # 14

Root A. G., Perkalskis B. Sh., Larin V. L., Azbukin A. A., Sotiriadi G. N. Acoustic Lens Antennas. // Atmospheric and oceanic optics. 1988. V. 1. No. 12. P. 67-68.
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Abstract:

Lens aerials with different feeds are described. The main characteristics of the antennas are discussed. The effective indices of refraction for the circular waveguide lenses used are estimated to be 1.25, 1.4 and 2.