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- antenna beam width 天线射束宽度
- With the help of statistic principle, the estimtion ormulas ofthe antenna gain loss, beam width and siedlobe level in sparse array are derived. 应用概率统计原理，导出了具有幅相误差、元失效时稀疏阵天线阵增益损失、束宽度、向、瓣电平的估计公式、得出一些有益结论。
- The paper studies three key problem of base station array antenna for mobile communication, controlled radiation pattern, beam width and passive intermodulation. 本文研究移动通信基站天线中的三个关键问题，波束赋形、波瓣宽度、无源交调。
- By applying "slit method",the beam width of THz wave was measured. 利用“狭缝法"测量了太赫兹光束的束宽。
- The estimation results based on these equations show that the rain echo power may deviate from its normal value by a factor of -3 to +6 db depending on the radar height, antenna elevation, wave length, beam width, surface reflectivity and roughness. 根据这些公式的计算结果表明;雨区回波功率与不考虑这些因素情况下的值相比较;可有-3至+6分贝的偏差;具体值取决于雷达离地高度、天线仰角、雷达波长、波束宽度、地表反射系数和粗糙度等.
- Due to the frequency selectivity, non-stationary and multipath effect of the ionosphere, it is difficult to measure the beam width of OTHR antenna in azimuth of this kind of radar. 摘要由于传输信道电离层存在频率选择性、非平稳性和多径效应，对天波超视距雷达的方位波束宽度性能进行测试存在着相当的困难。
- In case of electronic scanning the beam width is broader by a factor of two . 电子扫描时，波束宽度展宽一倍。
- The results show that this DBF design can adjust the magnitude and phase of each channel,digitally forming antenna beam. 实验结果表明,该数字波束形成设计能实时调整各通道的幅度和相位,实现数字波束形成。
- Combining genetic algorithm with LMS,a hybrid genetic algorithm(GA_LMS)for satellite adaptive nulling antenna beam space was proposed. 将遗传算法与LMS算法结合构成一种混合遗传算法,并将其用于卫星自适应调零天线的波束空间调零处理。
- It can perform a flexible emissive and receiving antenna beam and have a good anti-jamming ability.This thesis is a previous research before engineering fulfillment. 本文设计了用可实现模拟多种不同工作体制、具有灵活可变的收发波束和较好抗干扰能力的雷达天线平台，为工程实现提供了理论支持。
- It is important to eliminate or degrade the effect caused by the beam width of echo sounders and reflect the true seabed. 为提高海底地形的测量精度，应消除或减弱波束角效应影响。
- When the initial power equals the critical power, a stabile spatial soliton is obtained, and generally the beam width takes periodical contraction or diffraction. 当初始功率等于临界功率时,可以得到一个稳定的空间孤子,而一般情形下,束宽则作周期的压缩或展宽变化。
- Results are satisfactory. this method can be applied to multibeam synthesis for arbitrary set of nonuniform elements, as well as beam width stretch and sector shaped beamforming. 该方法可用于任意单元构成的不均匀阵列天线;还可用于波束展宽及扇形波束的合成 In this paper; an effective method of multibeam smart antennas pattern synthesis for base station using digital beamforming technique is presented.
- Because the adjustment of antenna beam direction is in a very small range, so the effection on antenna sidelobe and beamwidth can be omitted, that is to say, it will not make any effection on other performances of the radar system. 由于对天线波束指向的调整在很小的范围内，故对天线的副瓣及波瓣宽度指标的影响可忽略，从而不会影响到雷达系统的基他性能。
- Compared with the conventional array receiver, optimal transmitting beam width decreases and transmitting power requirement is debased in the distributed array receiver. 与传统式阵列相比,分布式阵列可以采用更窄的发射光束宽度,降低对发射功率的要求。
- When the input power is smaller than the critical power, the beam width takes quasi-periodical diffraction with the Jacobian elliptic sine and elliptic cosine functions. 当光束初始功率小于临界功率时，光束束宽则按雅可比椭圆正弦函数和椭圆余弦函数作准周期展宽变化；
- Technical specifications are all satisfied within required wide frequency range, which include VSWR, main beam width, sidelobe level, gain, and the mutual relation of sum and difference patterns, etc. 在较宽的频带内，对于驻波比，主瓣宽度，旁瓣电平，增益，和 与差方向图对应关系等都得到了满足。
- The critical power ofthe strongly nonlocal soliton is proportion to the 2th power of the characteristic lengthof the response function and in inverse proportion to the 2th power of beam width. 强非局域孤子的临界功率与非局域特征宽度的2次方成正比，与光束束宽的2次方成反比。
- The relative errors of the beam width and far-field divergence angle introduced by the spherical aberration increase with increasing spherical aberration coefficient and decreasing beam order. 束宽和远场发散角的相对误差随球差系数绝对值的增加和光束阶数的减小而增加；
- The critical power of the strongly nonlocal soliton is proportion to the 4th power of thecharacteristic length of the response function and in inverse proportion to the 4th powerof beam width. 另外，分析了孤子的传输特性，强非局域孤子的临界功率与非局域特征长度的4次方成正比，与光束束宽的4次方成反比。
