aperture efficiency

numerical results show that the effect of metallization thickness is smaller on the direction of main beam and very noticeable on the beamwidth and aperture efficiency.

数值结果表明，金属栅厚度对漏波天线波求方向影响较小，但对漏波天线的辐射效率和波束宽度有明显的影响。

it has the characteristics of the small volume, light weight, high aperture efficiency and low wide-angle minor lobe and so on.

它具有体积小、重量轻、口径效率高、宽角副瓣低等特点。

the measured results are as follows: the antenna gain is 21.5 db with an aperture efficiency of about 46%, the reflection coefficient is about 0.07~ 0.39 in the range of 6.5~ 7.5 ghz.

实验测量结果为：增益21.5dB，口径效率约46%，在6.5~7.5GHz频率范围内反射系数约为0.07~0.39。

Efficiency of Polarizing Beam Splitting Scheme for Rayleigh Laser Guide Star Transmitted and Received in Common Aperture

激光导星共孔径发射接收的偏振分光效率研究

The coaxial horn is studied with finite-element methods ( FEM). The results indicate that this type of horn is characterized by high aperture efficiency, short axial length, wide bandwidth, and low sidelobes.

对同轴喇叭进行了系统的研究，结果表明，该喇叭具有纵向尺寸短、口径效率高、频带宽和副瓣小等优点。

waveguide slot antenna with a compact, thick, light weight, high aperture efficiency, easy to achieve low sidelobe characteristics, is widely used in radar and communications.

波导缝隙天线具有结构紧凑、厚度小、重量轻、天线口径效率高、容易实现低副瓣等特点，被广泛应用于雷达和通讯领域。

factor which affected the aperture efficiency is analyzed, and then the aperture efficiency using three approaches is optimized;

分析了影响阵列天线口径效率的因素，通过三种途径优化了口径效率；

calculation results show that a sidelobe level and aperture efficiency closed to the theoretic ones can be achieved provided the designed aperture distribution is around the theoretic low sidelobe aperture distribution.

计算结果表明，只要口径场分布的设计值在低旁瓣口径场分布的理论值上上下波动，就能获得与低旁瓣口径场分布的理论值较接近的旁瓣电平和口径利用效率。