Comb-Shaped Miniaturized Microstrip Antenna Loaded with N-Shaped Metasurfaces

A novel comb-shaped microstrip antenna is designed by periodically loading the N-shaped metasurfaces. These N-shaped metasurfaces can reduce the antenna resonant frequency, and therefore make the comb-shaped patch electrically smaller than the regular one. One such comb-shaped patch antenna is numerically demonstrated resonating at 2.382GHz, using a dielectric with ε
r
= 2.2. The patch length is 30mm (0.238λ
0
or 0.353λ
g
). It is smaller than a conventional antenna with the patch length of 0.5λ
g
. The simulated antenna gain is 6.596dBi and the efficiency is 91.73% at 2.382GHz.