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The radiation and scattering characteristics of double‐layer planar dielectric waveguides integrated with a metal‐strip grating are analyzed using a two‐dimensional model and a narrow‐strip current approximation. Some numerical data concerning the highly directional antenna applications of these structures in the millimeter‐wave range are presented. © 1996 John Wiley & Sons, Inc.

Abstract. The propagation and radiation characteristics of forward and backward leaky waves in 2D-periodic printed-circuit arrays on substrate-integrated waveguides with meander-shaped slots are numerically investigated. For finite-size arrays, the matching and radiation characteristics are computed depending on frequency and progressive phase shift between waveguides assuming uniform excitation of all array inputs. Studies show that the achieved scanning sector in the frequency range from 9 to 13 GHz is around 90° in the elevation and 40° -72° in azimuth with the phase shift of 75°. It is also shown that at a given frequency and with a change in the phase shift the array beam scans along the surface of an almost circular cone with the angle at its vertex depending on the frequency. This angle varies with frequency change, which

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