A Ka-band cavity-backed patch antenna with parasitic strips using LTCC multilayer technology

This paper presents the design of a Ka-band cavity-backed patch antenna with parasitic strips using low temperature cofired ceramic (LTCC) multilayer technology. A cavity-backed structure consisting of a square ring of short-circuited metal plane is used to surround the microstrip patch antenna for alleviating the effect of the edge diffraction and reducing the backside radiation, hence, improving the radiation performance. Additionally, two groups of parasitic strips, mounted above two radiation side of the microstrip patch, act as directors to increase the gain, and also introduce resonant structures to broaden the bandwith. By the designed structure, a high maximum gain, about 8.3 dBi, is achieved; and the return loss better than -10dB bandwidth is over 23%, from 31 GHz to 39.3 GHz.