Research On Stealth Technology Of Platform Communication Antenna Based On Metamaterial

Stealth weaponized platforms are the developing trend of modern warfare.As a special type of scattering source,platform communication antennas will become an important issue restricting the overall stealth performance of stealth platforms.Conventional stealth methods,such as shape design and absorbing materials,have limitations to make the antenna stealth.Meanwhile,the emergence of artificial electromagnetic material technology has brought new ideas to the research of antenna stealth.As a kind of artificially created electromagnetic periodic structure,metamaterial has attracted much attention due to its many different electromagnetic properties.To meet the stealth requirements of stealth platforms for communication antennas,this paper conducts research on stealth technology combining metamaterial and platform communication antennas.To decrease the structure mode scattering of the antenna,we use a variety of metamaterial and complete the related work of communication antenna broadband stealth,platform antenna and radome integration design.This paper draws on the classic Uni-planar compact electromagnetic bandgap structure and uses the interdigital capacitance method to improve the mushroom-type EBG structure so that obtain a new UC-EBG structure,which has the advantages of miniaturization and wide in-phase reflection bandwidth.We design a strip-line-fed four-unit microstrip array to verify the scattering reduction effect of the new unit.According to the influence of the radiation and scattering performance of the loading UC-EBG structure antenna,we comprehensively optimize its layout and area occupied by different parts.The proper number of periodic elements is obtained to make the entire antenna structure appear as a passive cancellation surface,reducing out-of-band scattering under normal incidence conditions,and at the same time unit rotation technology is used to reduce the antenna's in-band scattering.The polarization rotating surface can also be used for antenna scattering reduction through a checkerboard configuration.We design a polarization rotating surface unit in the shape of a cantaloupe and analyze the principle of rotation.Based on this,a partially reflective polarization rotating surface and foam-type polarization rotating surface are designed.We discussed the reduction of RCS after slotting the microstrip antenna,and used the partially reflective PRS to form a Fabry-Perot resonance structure with the antenna,which achieved the antenna's low scattering performance and improved the antenna gain.The foam-type PRS moves the unit resonance to a low frequency because of increasing the profile height.Applying it to a microstrip slot array without a strict profile height requirement,the antenna shows a good stealth performance.Under grazing incidence conditions,the antenna cavity is designed as a single large sawtooth inclined step structure along the front and back to reduce the strong scattering of the carrier cavity itself.A bandpass frequency selective surface(FSS)radome is designed to cover the top of the antenna and be coplanar with the carrier.For clutter entering the cavity at grazing incidence angles,apply absorbing materials at the front and back edges to reduce the multiple reflections of the incident waves.Finally,we realize the stealth design that integrates the FSS radome,antenna and low RCS carrier platform in a certain frequency and angular range.In addition,using the band-resistance characteristics of the FSS,we combined with absorbing resistance film to design a new absorbing frequency selective radome.The radome has characteristics of in-band transmission and out-band absorption,which is used to reduce antenna scattering at normal incidence and large angles.