1) harmonic frequency shift
谐波频移
2) Fourier spectrum harmonic spectrum
谐波频谐
3) harmonic mixer
谐波混频
1.
The author mainly introduces these key technics,including: high LO harmonic mixer technic,the micro-wave directional coupler s designing and manufacturing,the directional detector technic,the build-in doubler s amplitude and flatness control technic and the micro-wave calibration technic.
本文介绍了一种基于微波矢量网络分析仪实现3毫米频段扩频的技术方案及工作原理,重点对高本振谐波混频技术、毫米波定向耦合器设计制造技术、定向检波器技术、内置倍频源幅度及平坦度控制技术、毫米波校准技术等关键技术进行介绍。
2.
A integrated Ka band fourth harmonic mixer with very low conversion loss using a novel 1-D EBG structure was presented.
介绍了一种全集成微带四次谐波混频器,该混频器采用了一种新型电磁带隙结构,可获得很低的变频损耗指标。
3.
This paper gives the particular description of a theoretical analysis and practical design for high IF frequency millimeter-wave subharmonic mixer with three one-dimensional photonic bandgap (PBG) cells.
介绍了谐波混频器的混频原理和设计方法,应用高频场仿真软件及谐波平衡计算软件,研究并实际制作了带有一维光子带隙结构的Ka频段微带全集成高中频四次谐波混频器。
4) high frequency harmonic
高频谐波
1.
The ZigBee technology radio-frequency signal can invade power plant equipment to produce the high frequency harmonic,and the harmonic going beyond standard is able to affect security and economical operati.
ZigBee技术射频信号会侵入电厂设备产生高频谐波,谐波超标会影响电厂的安全和经济运行。
5) Harmonic mixing
谐波混频
1.
Harmonic mixing at sub-mm wave band has been studied on two different HTS mixing systems:one is mounted on pulse tube cryocooler, the other is G-M cryocooler.
我们分别选用了小型脉冲管制冷机以及小型G-M制冷机设计了高温超导混频测量系统,对亚毫米波段谐波混频进行了实验研究。
2.
Harmonic mixing at sub-mm wave band has been studied on two different HTS mixing systems:one is mounted on pulse tube cryocooler,the other is G-M cryocooler.
我们研究了基于YBCO/MgO,YBCO/YSZ约瑟夫森超导结的谐波混频器。
3.
Experiment on harmonic mixing at 3 mm waveband is carried out.
采用离子刻蚀法进行刻蚀,制备出集成天线的结,进行了3mm谐波混频的实验,测量分析了高温超导混频器的变频效率与本振信号功率、微波信号功率、谐波次数、偏置电流等参数之间的关系。
6) harmonic frequencies
谐波频率
1.
Aim To extract harmonic frequencies of helicopter acoustic signal as features for hel icopter identification.
目的提取直升机声信号谐波频率作为特征用以识别直升机。
2.
Methods Based on the analysis of spectral characteristics of a helicopter acoustic signal, a method of subspace decomposition was proposed for the purpose of suppressing noise interference and increasing the ability of recognizing target and multiple signal classification(MUSIC), an algorithm of harmonic retrieval, was introduced to extract harmonic frequencies from acoustic signals.
方法 通过对直升机声信号频域特性分析 ,采用基于子空间分解的多重信号分类法 ( MUSIC)算法提取信号谐波频率作为目标特征 ,利用子空间分解将观测数据分解为信号子空间与噪声子空间的特点 ,抑制噪声干扰 ,提高识别能力 。
补充资料：谐波
谐波
harmonics
(harmonies)频率为基波频率整数倍的正弦波分量，又称高次谐波。在交流电路中.具有非线性阻抗特性的电气设备(见非线性负荷)向电源反馈高次谐波，导致电力系统电压、电流波形崎变，使电能质盘变坏。近年来，由于电力电子技术的发展，大量换流设备、电子设备等具有非线性阻抗特性的电气设备接人电力系统，造成谐波污染。这些电气设备称之为谐波源，主要有电力机车、电弧炉、整流器、变频器、逆变器、相控调速和调压装置、电焊机、感应加热设备、气体放电灯以及有磁饱和现象的机电设备。 谐波的危害性表现在干扰通信线路，使同步发电机额定输出功率降低，感应电动机功率因数下降、转矩降低、损耗增加，变压器温度升高、效率降低，加速电气设备绝缘介质老化，使用寿命缩短，甚至损坏，控制保护及枪侧装t工作精度、可靠性降低等。 谐波限制标准见供电质童。
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参考词条