Abstract: An microstrip H-type slot antenna with E-type parasitic patches in Ka-band is proposed in this paper., the developedprototype of this antenna employs a multilayer Low-Temperature Co-fired Ceramic (LTCC) substrate. The E-type parasitic patchesare used instead of the traditional rectangular chip to achieve antenna’s miniaturization and improve the impedance characteristics toincrease the antenna’s bandwidth to some extent. At the same time, owning to the parasitic patches, the orientation of the antenna ischanged better, so its gain can be improved. The antenna installs five patches on two LTCC layers, the 2×2 E-type parasiticpatches on the upper layer and the radiation chip on the lower one .The proposed antenna by simulation can achieve 7.7 dB absolutegain at 35 GHz and while the fractional bandwidth of -10 dB return loss is 20.8％(from 32 to 39.3 GHz).