The theoretical and experimental results are presented, which show the low axial ratio and low loss characteristics over octave frequency band of the polarizer.
给出理论和实验结果，证明了这种四层曲折圆极化器可以在倍频程范围内得到良好的低轴比、低损耗特性。
A design method for low phase noise agile X-band frequency synthesizer is presented, the theoretic analysis and calculation is performed and the test results are given.
介绍一种低相噪、捷变频x波段频率综合器设计方法，并进行理论分析、计算，最后给出测试结果。
The utilization rate of licensed spectrum is very low in the time domain, frequency domain and space domain, while the unlicensed band is overcrowded seriously.
大部分授权频段在时域、频域和空间域的利用率很低，而公共频段出现了严重的频谱拥挤。
In low frequency sub band, the watermarking is embedded into host by the way of pixel-to-pixel embedding according to HVS model.
在低频分量部分，基于HVS视觉模型，将水印信号逐点变化地嵌入到原始图像中；
Approximate coefficients in low frequency band of two images and the average over absolute wavelet packet coefficients of high frequency brand form a fused coefficients matrix.
对两幅图像低频波段的逼近系数取均值，对高频段选取绝对值大的小波包系数，得到融合系数矩阵。
AimTo use the common sample frequency in low speed to the sample of band-pass signals of multiple different frequency point in full frequency rage.
目的用公共的低速采样频率对全频段内许多不同频点的带通信号进行采样。
This structure can form a wave-guide in photon crystals and light can propagate in it with different selected frequency in photonic band gap with low loss.
该结构在光子晶体中构成光波导，能使光子禁带中不同的被选择的缺陷态频率的光子以极低的损耗通过。
The circular region F-norms in low frequency band of wavelet transform is used as color feature of the image and the energy ratio of high frequency band is used to form texture descriptor.
颜色特征采用整数小波低频系数矩阵中环形区域的F -范数，纹理特征则采用高频部分的能量比值。
Booster compressor noise has the characteristics of wide frequency band, intense low frequency sound and considerably high total sound pressure level.
增压机噪声具有频带宽、低频声强烈，且总声级又相当高的特性。
By using the plane wave expansion and finite-different time-domain (FDTD) methods, we can find a larger absolute band gap in the low and high frequency.
通过运用平面波展开方法以及有限差分时域(FDTD)方法进行分析，可以明显地发现，在低频和高频区域增大了光子晶体的光子禁带。
The frequency parameters are set in highly denseness in high energy frequency band, but in sparse denseness in low energy frequency band.
在能量高的频段密集选取频率参数，相反在能量低的频段稀疏选取频率参数。
With the perfect characteristics of acoustic vector sensor in the low frequency band, accurate DOA estimation is achieved with small array size.
利用矢量传感器在低频段的良好特性，实现了小尺寸声阵条件下的高精度目标DOA估计。
The serial product features include wide frequency band, low VSWR, high attenuation accuracy, small dimensions, high power, excellent capacity in anti-burnout etc.
该系列产品具有频率范围宽、驻波系数低、衰减精度高、体积小、功率大、抗烧毁性能好等特点。
The selection of filter is controlled by software, so that low-noise signal can be acquired in a wide frequency band.
由软件控制选择滤波器，这样可以在很宽的频带获得低噪声的信号。
A frequency selective surface (FSS) is a metallic periodic structure with frequency selective properties. Depending upon design, it may be low-pass, high-pass, band-pass, band-stop filter.
频率选择表面（FSS）是具有选择频率功能的一块金属周期结构，它可以被设计成低通、高通、带通、带阻滤波器。
The purpose of this project is to design a wide frequence band, fine frequency step, low phase noise and low spur synthesis sweeping source suited for the spectrum analyser.
本课题的目的是设计一个适用于该频谱分析仪的宽频率范围、精细频率步进、低相噪及低杂散的合成扫频源。
Useing the bimorph bend vibration mould, a simple and low cost electroacoustic doubler and mixer available for overall low frequency band can be produced.
利用双晶片的弯曲振动模式可以制造出结构简单、成本低廉的电声倍频器、混频器，可适用于整个低频范围。
The conic errors produced by frequency band narrow, quantization error, and installation error of gyro and low attitude update rate were analyzed.
研究了由陀螺频带不足、量化误差和安装误差，以及姿态更新率过低造成的圆锥误差。
The fault characteristic periodic signals of the rolling bearing are in low frequency band and often buried in the noise.
反映滚动轴承故障的特征周期信号处于较低频带内，容易被噪声淹没，难以检测。
Wide frequency band, high power, low losses and wide temperature coefficient are the developing trends of microwave ferrite materiel.
微波铁氧体材料的发展趋势是宽频带、功率、损耗、温度系数。
The data of polar motion, rotation of the earth and atmospheric excitation function are analysed by the Auto-Regression power spectrum method, and their spectra at low frequency band are obtained.
本文用自回归功率谱方法分析了极移、地球自转和大气激发函数的资料，得到了它们的低频谱。
The attenuation factor of longitudinal wave was changing linearly, whereas the attenuation factor of the slow shear wave kept nearly constant with a low frequency on the exploration seismic band.
纵波的衰减系数在地震频带内基本上呈线性变化，而横波的衰减系数在地震频带内除低频外基本保持稳定。
Compared with traditional bearing fault diagnosis method, the approach proposed in this paper can detect the low frequency modulated components from high frequency band.
与传统的轴承故障检测技木相比，其优越性在于可以提取振动信号的高频能量中的低频调制信号，从而大大提高了故障特征信号的信噪比。
This coaxial joint component combines two joints working on the same frequency. It is characterized by wide band, small VSWR and low insert loss.
这种交连组合采用同轴结构，将两路工作频率相同的交连有机地结合在一起，具有宽带、小驻波、低损耗特点，且体积小、重量轻。
With analyzing the detecting procedure of Low-frequency active sonar and emulating about it, the Optimum Detection frequency Band of Low-frequency active sonar were researched.
本文通过对低频主动声纳的主动声纳方程的分析与声学探测过程的仿真，初步研究了低频主动声纳在不同距离上的最优探测频率问题。
The thermal noise of resistance could be overcome by reducing the physical temperature, choosing appropriate working frequency band low noise elements, etc.
可通过降低电路的物理温度、择合适的工作频带及低噪声元件等措施，克服电阻热噪声。
The coaxial feed is an important dual-band feed used in reflector antennas. The inner conductor of the coaxial feed is the high frequency feed, and the coaxial zone is the low frequency feed.
同轴馈源是用于反射面天线双频共用馈源的一种重要形式，其内导体为工作在高频段的圆波导馈源，同轴区域为工作在低频段的同轴馈源。
Then, multifractal analysis is performed for low frequency sub-band. The multifractal spectrum is used as the characteristic parameters to filter pixels which mark different scenery.
然后对低频子带进行多重分形特性分析，再将多重分形谱作为特征参量进行像素筛选，筛选出标志不同景物的像素点。
It is easy to observe slow P-wave in the condition of large porosity and low frequency band.
低频、高孔隙度条件更有利于慢纵波的观测。
It is easy to observe slow P-wave in the condition of large porosity and low frequency band.
低频、高孔隙度条件更有利于慢纵波的观测。
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