Design and Implementation of 3 MHz Co-site for Ultra-short Wave Link

The 3 MHz co-site design has become a critical issue in ultra-short wave link communication, enhancing the sensing ability of a flying aircraft. However, current 3 MHz co-site systems face challenges from space isolation, broadband noise, and anti-blocking considerations. In this study, we attempt to provide an optimized 3 MHz co-site system that deals with the mentioned challenges. We primarily present a typical 3 MHz co-site system’s structure. Then, antenna position, transmitter, and receiver optimizations are proposed for space isolation, broadband noise, and anti-blocking problems, respectively. Finally, we conducted a system test in a laboratory, and the experimental results demonstrated the effectiveness of the designed co-site system. In addition, differentiated design methods for different application requirements are summarized to satisfy the needs of various co-site systems.