Design of a broadband communication array element antenna in K-band

With the development of communication frequency to K-band, array antenna has become a trend of communication antenna. The microstrip antenna has the characteristics of simple fabrication, easy integration and low cost. It has become a main antenna of array element antenna. With the continuous shortening of working wavelength, the actual processing degree of unit antenna becomes more complex, and the structural accuracy requirements become more stringent. In this paper, a linearly polarized K-band array element is proposed, which uses metallized via holes as electrical walls to reduce the degree of mutual coupling between elements. Finally, the simulation results show that the return loss of the unit antenna is less than -10dB in the whole required working frequency band, which meets the requirements of communication antenna.