A slot antenna
consists of a metal
surface, usually a flat plate, with a hole or slot cut out. When the plate is driven
as an antenna
by a driving frequency, the slot radiates electromagnetic waves
in similar way to a dipole antenna
. The shape and size of the slot, as well as the driving frequency, determine the radiation distribution pattern
. Slot antennas are often used instead of line antennas when greater control of the radiation pattern is required. Slot antennas are often found in standard desktop microwave
sources used for research purposes.
A slot antenna's main advantages are its size, design simplicity, robustness, and convenient adaptation to mass production using PC board technology.