A Compact Millimeter-Wave Cavity-Backed Antenna with Partially Reflecting Surface Loaded

Based on a resonant cavity with partially reflecting surface (PRS) loaded, a substrate integrated waveguide (SIW) fed cavity-backed antenna is proposed. 15 H-shaped elements that equally spaced in a rectangular grid are designed as the PRS. The proposed antenna size is 0.45λ
₀
×0.54λ
₀
×0.14λ
₀
, where λ
₀
is the free space wavelength of center frequency. The antenna profile is reduced by about 44% compared to conventional cavity-backed aperture antenna. An impedance bandwidth of 13.6% (33-37.8 GHz) with |S
₁₁
| below -10 dB has been achieved.