Frequency scanning by leaky-wave antennas using artificial dielectrics

Frequency-scanning characteristics of an artificial dielectric leaky-wave antenna are discussed. It is experimentally observed that the beam angle changes from
10\deg
to
50\deg
off broadside when the frequency is changed from 8.13 to 9.05 GHz. Over this frequency range the beamwidth does not vary monotonically and changes from
7.5\deg
to
6.0\deg
to
7.1\deg
. It is found that the artificial dielectric antenna has a better temperature stability than that for frequency scanned arrays.