Design of Frequency Selective Radome Based on Truss Structure

With the continuous development of science and technology, more and more attention has been paid to the adaptability of radar equipment in complex electromagnetic environment. Due to the bad natural environment and external electromagnetic interference, the normal operation of electronic equipment is not ideal. The radome with good compression performance and filtering ability is one of the effective ways to solve the above problems. In this paper, a kind of frequency selective radome based on truss structure is studied. It can not only protect the antenna structure physically, but also has high transmission performance to the electromagnetic wave in the working frequency band of the antenna. It can effectively eliminate the out of band interference of the receiver system and purify the working environment of the equipment. According to the working frequency of the expected electromagnetic wave and the second and third harmonic frequency radiated by the surrounding interference equipment, the equivalent circuit method is used to design the frequency selection unit structure, and the CST electromagnetic simulation software is used to combine the frequency selection unit with the truss structure to design the frequency selective unit structure with specific band pass and stop band characteristics, so that the electromagnetic equipment to be protected radiated electricity The magnetic wave is in the pass-band range of frequency selective surface, and other electromagnetic interference in the surrounding environment is in its stop-band range. The frequency selective radome designed in this paper has spatial filtering performance, high specific strength and high specific stiffness. It can purify the electromagnetic environment around the expected electronic equipment and enhance the adaptability of the electromagnetic environment.