Research On Low RCS Of Reconfigurable Antenna

In modern electronic warfare,stealth technology occupies an important position.Because stealth technology can greatly reduce the detection distance of enemy forces,and improve the combat effectiveness and survivability of friendly forces.As an essential external device for wireless devices to communicate with the outside world,antennas must maintain normal and stable transceiver capability in complex electromagnetic environments to ensure the normal work of wireless devices.And this feature of the antenna also makes it become a significant target on the battlefield.Therefore,how to reduce the scattering of antennas while ensuring their radiation capability is a problem that remains to be solved.This thesis explores a new dimension of antenna scattering reduction by introducing reconfigurable techniques.The main research of this thesis are as follows:1.From the commonality of reconfigurable technology and antenna scattering reduction technology,the feasibility of reconfigurable antenna scattering reduction is analyzed,which provides the principle guidance for antenna design in this thesis.2.A broadband frequency reconfigurable in-band low scattering antenna is designed using a frequency reconfigurable technique.The antenna has an operating relative tuning bandwidth of 42%,and two states of radiation and low scattering.In the radiation state,the antenna maintains good radiation characteristics in the whole operating band.In the low scattering state,the antenna achieves scattering reduction up to 26.7 d B at a large angle in the corresponding band.The antenna achieves broadband in-band scattering reduction without increasing the aperture or profile.3.This thesis proposes a microstrip antenna that introduces a directional map reconstruction method to achieve scattering reduction.Based on the electromagnetic dipole radiation characteristics and phase extinction principle,the antenna achieves a half-power wave number width of more than 200° in the E-plane and H-plane under state one.And ±37° beam deflection in the E-plane and ±32° beam deflection in the H-plane in the other states,respectively.The proposed antenna also has low scattering characteristics in either state,and the antenna scattering can be further reduced during beam deflection.