Low-Profile Dual-Band Magneto-Electric Dipole Antenna Loaded With Metasurface

A low-profile dual-band magneto-electric (ME) dipole antenna loaded with metasurface is proposed in this letter. The ME dipole operates at the lower band and the metasurface works at the upper one. The antenna is printed on two substrate layers with a profile of only 0.058 λ
₀
(λ
₀
is the wavelength in free space at the center frequency of the lower band). The ME dipole is on the lower substrate. The electric dipoles are composed of four quasi-square ring patches, whereas the magnetic dipole is made up of the metalized vias loops and the ground plane. The metasurface above the ME dipole is on the upper substrate, which is composed of 4 × 4 square patches. An antenna prototype operating in
X
/
Ku
-band is fabricated and measured. The measured |
S
₁₁
| <−10 dB bandwidths of the two bands are 22.6% and 13.4%, respectively.