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 ensures the 2D scanning capability of the
array. A comparison with the earlier published results is
given.
Keywords: leaky-wave antenna, 2D-periodic waveguide slotted array,
substrate-integrated waveguide, forward and backward leaky waves,
frequency-phase scanning.
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