Relevance analysis between harmonic and fundamental frequency in emitting spectrum of active phased array antenna

Phased array antenna works with wide frequency band and high power, and the harmonic component of its emitting spectrum extremely easily produce electromagnetic interference to other equipments with antenna on the platform. It is necessary to forecast the harmonic coupling in the design stage. Take typical vivaldi active phased array antenna for example. Through analyzing the relevance mechanism of harmonic and fundamental frequency energy, we establish the simulation method of harmonic emitting from phased array antenna. Then the simulated results are compared with the experimental data. The comparison shows that harmonic and fundamental frequency in emitting spectrum of active phased array antenna have relevance, and this relevance can be used to simulate emitting harmonic energy. It has practical application value in electromagnetic compatibility prediction for ships.