传播损耗

实验结果表明，对于TE和TM偏振，该聚合物波导在1.31μm和1.55μm波长下分别有低达0.43dB/cm和0.51dB/cm的传播损耗。

The experimental results exhibit that the polymer waveguide has a low propagation loss of 0.43 dB / cm and 0.51 dB / cm at a wavelength of 1.31 μ m and 1.55 μ m , respectively , for both TE and TM polarizations .

根据CDMA信号模型和多径信道模型，估计室内用户信号到达已知位置的参考点的幅度衰减系数，然后根据室内传播损耗模型得到用户与参考点的相对距离，再利用参考点位置对用户进行定位。

Based on the signal model and the multipath channel model of CDMA , amplitude attenuation factors of the signals for indoor users arriving at reference points of known locations are estimated . Then the distances between users and reference points are obtained based on the indoor propagation loss model .

基于三维PE方法的雷达波传播损耗估计

Loss Evaluation for Radar Wave Propagation Based on Three Dimensional Parabolic Equation

利用Fock关于地波绕射场的理论，介绍了一个电波沿光滑海面传播损耗的简单计算公式。

Based on Fock 's diffraction fields theory , a simple propagation loss approximation for radio wave propaga - tion over the smooth sea is presented .

基于传播损耗模型的最大似然估计室内定位算法

A Maximum-Likelihood Indoor Location Algorithm Based on Indoor Propagation Loss Model

超视距雷达地波沿光滑海面传播损耗的计算

Propagation Loss of Ground Wave for OTH Radar above Smooth Sea

平面光波导膜层厚度对传播损耗的影响

Effect of the planar optical waveguide film-thickness on the propagation attenuation

丛林环境传播损耗实验研究

Experimental Research of the Propagation Loss in the Forest Environment

海洋上大气波导中电磁波传播损耗的误差分析和敏感性试验

Sensitivity experimentation and error analysis of electromagnetic propagation loss in ocean waveguide

高频超声在变幅杆件中传播损耗的测试

The test of transmission losses of high frequency ultrasound in solid horn

无线电波沿光滑海面传播损耗的计算

A Propagation Loss Approximation for Radio Wave Propagation over the Smooth Sea

预测隧道中传播损耗的混合模型

A Hybrid Model for Propagation Loss Prediction in Tunnels

其次针对传播损耗分别进行了分析，并着重对求解损耗的算法进行了介绍。

Secondly , analyzes the propagation loss and introduces the algorithm of the loss .

预估城镇小区电波传播损耗的一种三维抛物方程算法

A Three-Dimension Parabolic Equation Algorithm for Predicting Radio Wave Propagation Loss in Urban Microcell

特别是在追求高电光系数的材料同时，传播损耗也将会不可避免地增加。

Especially , modulators will inevitably have higher waveguide loss seeking high EO coefficients .

实现了雷达探测概率，传播损耗的可视化，为电磁波传播评估及其可视化应用系统的研制开发积累了一定的经验。

All of above accumulated the experience of developing the electromagnetic wave propagation evaluating application system .

平流层通信传播损耗预测

Propagation Loss Prediction of Stratospheric Communication

然后利用波导模方法模拟了电磁波在蒸发波导中的传播损耗特性。

The characteristics of transmission loss are simulated in the atmospheric duct by using the modal theory .

粗糙海面对高频雷达地波空间场分量传播损耗的影响

Study of the influence of rough sea surface on the space field of HF ground-wave radar on coast

基于路测数据和统计模式，提出了针对城市微蜂窝的模式修正场强传播损耗预测方法。

A new propagation prediction method for urban microcellular systems is presented based on measurement data and statistic model .

得到了典型微区环境下的传播损耗、时延扩展和角度扩散等主要信道特性的描述。

After the study of simulation , the author got some descriptions of the major characteristics of the wireless channel in micro-cell environment .

分析了两个磁性层和间隔层的厚度对静磁后向体波色散和传播损耗的影响。

The dispersion and propagation loss can be reduced significantly by properly choosing the thicknesses of the two magnetic films and separation layer .

为了得到符合小区实际的期望方向图，分析讨论了无线信号各向传播损耗，包括路径损耗和阴影衰落造成的损耗的工程化测量方法。

In order to get the accurate desired pattern , an engineering applicable method for measuring the propagation loss including path loss and the shadowing is introduced .

这种光波导的数值孔径和单模光纤匹配，传播损耗低于平面条形硅光波导。

The numerical aperture of the waveguide is matched to a single-mode fiber and the propagating loss of the waveguide is lower than a rectangular silicon waveguide .

随着波导传播损耗的降低，器件调制区的长度可以做得更长，有助于进一步降低器件的半波电压。

Calculation makes the optimum overlap to 0.89 . The length of interaction can increase with the decreasing of waveguide loss , which is helpful for decreasing half-wavelength voltage .

在实际分析中，传播损耗与传播环境直接相关，同时也是分析网络覆盖链路指标最为重要的参考指标。

In the actual analysis , the propagation loss is directly related to the propagation environment and is an important basic reference for calculating link indicators and analyzing network performance .

蜂窝移动通信中小区基站的场强覆盖情况很大程度上决定了移动通信的通话质量和系统容量，而场强传播损耗预测是获得小区覆盖的最有效方法。

In mobile communication system , the quality of service and the capacity of the system are determined by the cell coverage which can be obtained from the field strength propagation prediction .

随着构建全球移动通信系统的提出，低轨卫星移动通信系统以自身传播损耗少、传播延时小以及发射功率小等优点正在飞速的发展。

With the construction of the proposed global mobile communications systems , LEO satellite mobile communication system on its own low propagation loss , small propagation delay and small transmit power is developing .

作为无线信道建模的基础理论，同时也是无线系统设计的理论基础，本文从平均传播损耗、宏观衰落、微观衰落三个方面介绍了移动无线信道的传播特性。

As the basis of design of wireless systems and the channel modeling theory , this article introduced the mobile radio channel propagation characteristics from three approaches which are the average propagation loss , macroscopic fading and micro are fading .

一般说来，光纤环形谐振器体积大难以实现光集成；平板波导微型环，受全内反射机理限制，其传播损耗会随着环尺寸的缩小而指数增加，进而阻滞了器件的小型化。

In general , optical fiber ring is bulky and incompatible with photonic integration . For planar waveguide ring limited by the total internal reflection ( TIR ) mechanism , its propagation loss increases exponentially with the reduction of ring radius .