A High-Gain Ka-Band Microstrip Patch Antenna with Simple Slot Structure

A high gain Ka-band microstrip patch antenna with simple slot structure is presented. The structure uses two patches and each patch has four slots on it. An open-loop is used to feed the two patches. The bandwidth of S
₁₁
<; -10 dB is from 33.0 GHz to 37.1 GHz, equivalent to a relative bandwidth of 11.7% centered at 35 GHz. With a dimension of 7.9mm×8.4mm×0.508mm(equal to 0.92 λ
₀
×0.98 λ
₀
×0.06 λ
₀
at 35 GHz), the peak gain in the band is high up to 11.5 dBi, and the gain in the band is higher than 10.6 dBi. The antenna has the advantages of high gain and simple structure, so it is a good choice for the small equipment.