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引言由分立辐射单元组成的线性阵列,当各单元的相位分布使阵面上形成一均匀相位斜坡时,在偏离垂射方向的给定角度上将产生一个波束: 式中,θ_0为扫描角, sin(θ_0)=λ·φ/2·PI·d (1) θ_0为扫描角λ为波长, φ为单元间的相位跃度, d为单元间距。采用减少移相器数的方法,即由每个单元用一只移相器减少到几个(典型数为5或6个)单元组成的子阵用一只移相器时,该阵列仍能进行扫描,不过在满足式(2)的情况下,所付出的代价是在远场出现栅瓣。
INTRODUCTION A linear array of discrete radiating elements produces a beam at a given angle off the dipping direction when the phase distribution of the elements creates a uniform phase ramp on the array: where θ_0 is the scanning angle, sin (θ_0) = λ · φ / 2 · PI · d (1) where θ_0 is the scanning angle λ, and φ is the phase jump between cells, and d is the cell pitch. Using a method of reducing the number of phase shifters, that is, a phase shifter that uses a phase shifter per cell to reduce to a few (typically 5 or 6) cells of a cell, the array is still capable of However, in the case of satisfying Eq. (2), the price is paid for grating lobes in the far field.