近年来随着现代化隐身侦察技术迅猛发展，天线的雷达散射截面特性在未来军事

With the rapid development of modern stealth reconnaissance technology in recent years, the antenna's radar cross-sectional characteristics play a decisive role in future military weapon systems. How to reduce the antenna RCS and make the antenna system work continuously and effectively under the condition of enemy electromagnetic interference, radar detection and attack is not only related to the vitality of the antenna system, but also affects the electromagnetic stealth performance of its carrier. The characteristic mode theory as a novel theory is expected to solve this problem. By analyzing the characteristic current of the surface of the antenna, the significant characteristic mode is determined, and the technical processing is carried out according to the characteristic mode theory. This article studies the microstrip antenna based on the characteristic mode theory. The specific contents are as follows: <br>1. The radiation performance and scattering characteristics of the reference microstrip antenna are analyzed. According to the analysis method of the characteristic mode theory, the antenna is determined by analyzing the flow direction of the surface characteristic current The significant characteristics of the mode, and then according to this characteristic, the plane wave excitation is used to obtain the mode weighting coefficient, and finally the characteristic mode is determined. According to the result of the reference antenna, two types of slotted antennas are designed. Comparing the results of the two antennas with the reference antenna, it is found that both can radiate effectively in the operating frequency band without affecting the antenna's radiation characteristics, and both can achieve a significant reduction in the micro-strip antenna single-site RCS, and the reduction values ​​have reached 10dBsm In the above, the purpose of using characteristic mode theory to reduce RCS is achieved, and the feasibility and superiority of these two slotting methods based on characteristic mode are explained. <br>2. The slotted microstrip antenna designed based on the characteristic mode theory is loaded with a ring patch and a resistor, and a microstrip antenna is designed. This antenna can effectively radiate, and the resonance frequency is consistent with the reference antenna, so that the antenna can normal work. When excited by a plane wave incident perpendicularly, the scattering performance of the reference antenna is reduced when the frequency is higher than 6.3GHz, and the reduction effect is most significant at the frequency of 7.7GHz. The reduction value reaches about 10dBsm. Therefore, this kind of microstrip antenna based on the combination of impedance loading technology and patch slot technology can achieve the effective reduction of RCS by absorbing the energy of the scattered field and the scattered wave, reaching the experimental expectations. <br><br>Keywords: microstrip antenna, RCS reduction, characteristic mode theory

In recent years, with the rapid development of modern stealth reconnaissance technology, the radar scattering cross-section characteristics of antennas play a decisive role in military weaponsystem systems in the future. How to reduce the antenna RCS, in the case of enemy electromagnetic interference, radar detection and attack to make the antenna system continue to work in a long-lasting and effective manner, not only related to the vitality of the antenna system, but also has an impact on the electromagnetic stealth performance of its carrier. As a novel theory of characteristic model theory is expected to solve this problem. By analyzing the surface characteristic current of the antenna, the significant characteristic pattern is determined, and the technical treatment is carried out according to the characteristic mode theory. In this paper, microstrip antennas are studied based on feature mode theory, as follows:<br>1. 分析了参考微带天线的辐射性能和散射特性,根据特征模理论的分析方法,通过分析表面特征电流的流动方向确定了天线的模式显著特性,再根据这种特性进行平面波激励得到模式加权系数,最后确定了特征模式,根据参考天线的结果设计出了两种进行开槽处理的天线。 Comparing the results of the two antennas with the reference antenna, it is found that both can carry out effective radiation in the operating frequency band, do not affect the radiation characteristics of the antenna, and can achieve a significant reduction of the microstrip antenna single station RCS, the reduction value has reached more than 10dBsm, the purpose of using the characteristic mode theory to reduce RCS, explains the feasibility and superiority of these two characteristic mode-based slotting methods.<br>2. A microstrip antenna is designed to load the ring patch and resistance based on feature mode theory, and a micro-band antenna is designed, which can carry out effective radiation, and the resonance frequency is consistent with the reference antenna, so that the antenna can function properly. When the vertical incident plane wave is used for excitation, compared with the reference antenna, its scattering performance is reduced at frequency higher than 6.3GHz, and the frequency of 7.7GHz is the most significant, the reduction value reached about 10dBsm, so this kind of micro-band antenna based on impedance loading technology and patch slotting technology combined with the absorption of scattering field and wave energy, RCS can achieve the effective reduction of the RCS.<br><br>Keywords: micro-band antenna, RCS reduction, feature mode theory

In recent years, with the rapid development of modern stealth reconnaissance technology, the radar cross-section characteristics of the antenna play a decisive role in the future military weapon system. How to reduce the RCS of the antenna and make the antenna system work continuously and effectively under the circumstances of the enemy's electromagnetic interference, radar detection and attack is not only related to the vitality of the antenna system, but also has an impact on the electromagnetic stealth performance of its carrier. As a new theory, eigenmode theory is expected to solve this problem. By analyzing the surface characteristic current of the antenna, the significant characteristic mode is determined, and the technology is processed according to the characteristic mode theory. In this paper, the microstrip antenna is studied based on the eigenmode theory<br>One The radiation performance and scattering characteristics of the reference microstrip antenna are analyzed. According to the analysis method of the characteristic mode theory, the significant characteristics of the antenna mode are determined by analyzing the flow direction of the surface characteristic current. Then the mode weighting coefficient is obtained by plane wave excitation according to this characteristic. Finally, the characteristic mode is determined. According to the results of the reference antenna, two kinds of slotting are designed Antenna. Comparing the results of the two antennas with the reference antenna, it is found that both of them can radiate effectively in the working frequency band without affecting the radiation characteristics of the antenna, and both of them can significantly reduce the RCS of a single microstrip antenna station, with the reduction value reaching more than 10dbsm. The purpose of reducing the RCS by using the eigenmode theory is realized, which shows the feasibility and feasibility of the two slotting methods based on the eigenmode Superiority.<br>2. Based on the characteristic mode theory, a kind of microstrip antenna is designed. The antenna can radiate effectively, and the resonance frequency is consistent with the reference antenna. Compared with the reference antenna, the scattering performance of the antenna can be reduced when the frequency is higher than 6.3ghz when the plane wave with vertical incidence is used for excitation, and the reduction effect is the most significant when the frequency is 7.7GHz, and the reduction value is about 10dbsm. Therefore, the microstrip antenna based on the combination of impedance loading technology and chip slotting technology can absorb the energy of scattering field and scattering wave The RCS can be reduced effectively, which meets the experimental expectation.<br>Keywords: microstrip antenna, RCS Reduction, eigenmode theory<br>