A staggered-arrangement EBG decoupling structure for Ku-band vehicle-mounted antennas

Ku-band (10.7-12.7GHz) vehicle-mounted mobile antenna serves as a link to satellite communication networks, which are widely used in applications such as mobile news, emergency response, and remote work. However, the electromagnetic interference and mutual coupling could disrupt the antenna performance and degrade the communication quality when it integrates multiple antennas on a vehicle platform, which is caused by the excitation and propagation of surface waves between adjacent antennas. A choke slot is commonly employed to enhance the isolation between antennas, but it diverges from the trend toward integrated circuitry and flat design in communication system development. Therefore, this paper presents a novel staggered-arrangement electromagnetic band gap (EBG) structure designed on current distribution, which can effectively enhance the overall isolation level to 70 dB within the frequency range of 10.7-12.7 GHz in simulation, and realize the integration of antenna and isolation structure into circuit system. The EBG with high isolation alleviates electromagnetic interference among antennas, ensuring the consistent functionality of vehicle-mounted antennas and improving communication quality.