Single and dual-beam microstrip leaky-wave antennas fed by a short-end copl
anar waveguide (CPW)-to-slot transition are presented. The radiation bands
of the antennas are deduced from the leaky-wave propagation characteristics
of the microstrip line first higher order leaky mode. The measured reflect
ion coefficients of the radiation band confirm the predicted leaky band and
the measured radiation paffems exhibit. the frequency-scanning feature of
the leaky-wave antenna. The short-end CPW-to-slot transition feeding method
simplifies the circuit layout and is more suitable for different band desi
gn than the CPW-fed microstrip first higher order leaky-wave antennas prese
nted in the literature.