Nanjing Research Institute of Electronics Technology

As the development of phased array radar, the higher directivity of coupler is needed. Especially there are the huge number of couplers in modern large phased array radar. To ensure the high-directivity, increasing precision control in production and more debugging time are usual ways, but they are not fit in the production of huge numbers. A simpler way to increase directivity of coupler is provided in this paper, and it doesn't lead more difficulty in production. It is proved in the actual production.