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等效导纳值是波导宽边纵缝天线的关键设计参数。为克服传统波导裂缝天线副瓣偏高、设计效率低下等问题,本文提出了一种单脊波导裂缝天线的改进设计方法,在传统波导裂缝阵列天线设计的基础上,利用等效导纳值对天线等效电路的影响,在裂缝单元下增加金属膜片,通过改变金属膜片的高度,优化裂缝等效导纳值,使得每个裂缝口径场分布更加接近于理论设计值,并在设计过程中使用牛顿迭代法提取导纳进一步缩短设计时间。通过设计实例表明:应用此方法设计单脊波导裂缝天线能够有效抑制副瓣电平,天线方位面副瓣电平可达到-30 dB以下;在满足主要指标要求的前提下,设计效率显著提升。
The equivalent admittance value is the key design parameter of waveguide wideside longitudinal-slot antenna. In order to overcome the problems of high side lobes and low design efficiency of conventional waveguide crack antennas, an improved design method of single-ridge waveguide crack antennas is proposed. Based on the design of traditional waveguide crack array antennas, the equivalent admittance value Antenna equivalent circuit, the increase of the metal diaphragm in the crack unit, by changing the height of the metal diaphragm to optimize the equivalent admittance of the fracture, so that each caliber aperture field distribution closer to the theoretical design value, and in the design process In the use of Newton’s iterative method to extract admittance to further shorten the design time. The design example shows that the design of single-ridge waveguide crack antenna can effectively reduce the sidelobe level, and the sidelobe level of the antenna azimuth can reach -30 dB or less. The design efficiency is significantly improved under the premise of meeting the main index requirements.