  A new type of high-impedance surfaces (HIS) has been introduced by C.R.
Simovski et al. recently. In this paper, we propose to use such layers as
artificial magnetic materials in the design of patch antennas. The new HIS is
simulated and patch antennas partially filled by these composite layers are
measured in order to test how much the antenna dimensions can be reduced. In
order to experimentally investigate the frequency behavior of the material,
different sizes of the patches are designed and tested with the same material
layer. Also the height of the patch is changed in order to find the best
possible position for minimizing the antenna size. This composite layer of an
artificial magnetic material has made the antenna smaller while keeping the
bandwidth characteristics of the antenna about the same. About 40% of size
reduction has been achieved.
