共查询到20条相似文献,搜索用时 93 毫秒
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为满足更大功率的微波源系统需求,提出了基于超高峰值功率发射机技术的微波源方案。建立了一个200MW 级高功率微波源验证系统,突破了65MW 级高功率速调管发射机小型化设计、200MW 级功率压缩、超大功率相控阵天线和超高峰值功率发射机监控与抗干扰等关键技术,为高功率微波源技术的研究提供了一种新的途径。介绍了微波源的应用现状和特点,阐述了微波源系统的组成、关键技术和具体的解决方案。详细介绍了超大功率发射机改进型调制器的设计,给出了脉冲变压器的仿真波形和电缆的高压电磁特性仿真图。最后对三种微波源方案进行了比较,给出了微波源系统工程化运用的改进建议。 相似文献
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本文叙述了开关电源在雷达发射机上的应用,展示了开关电源在微波功率源领域的广阔前景,指出了高压开关电源在发射机中带来的问题,并提出了解决的方法。 相似文献
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由一微波发射机工作在强辐射、强干扰的环境中,必须要有相应的控制保护系统来保证其可靠性和安全性。文章介绍了微波发射机控制保护系统的监控软件的结构和设计,以及用BorlandC++设计中文界面的方法。 相似文献
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S波段连续波调频发射机是为某飞行试验再入遥测研制的空载发射设备。它采用了分频锁相调频振荡和微波功率放大组合结构方案,其电路结构简单,调试较容易,杂波抑制比较高,工作性能稳定可靠。本文介绍了该发射机的工作原理,主要技术问题和解决办法,以及研制结果。 相似文献
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研制成功了直接调制带宽达2GHz的光发射机.在600MHz~2.8GHz范围内光发射机的输入反射小于-12dB。在使用频段内互调失真与载波比约为-20dB。在微波副载波多路卫星调频电视(0.97-1,47GHz)光纤传输系统中,该光发射机工作稳定,光发射机输出的光信号经40km单模光纤后获得了令人满意的图象质量(载噪比17dB)。 相似文献
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由于发射机工作在高微波辐射、强电磁干扰的环境中,而发射机监控电路又是敏感度较高的小信号电路,因此发射机监控系统的安全可靠工作至关重要。随着新型控制器件的不断问世,发射机监控技术取得了突飞猛进的进步,发射机的监控电路正在向高度智能化、集成化、自动化方向发展。文中阐述了发射机监控各种控制方式的特点,给出了应用于不同领域发射机的典型监控系统框图,并就如何从丰富发射机监控功能和使用当代新技术两方面来提升发射机监控的水平提出了一些见解。 相似文献
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Receiver Power Allocation and Transmitter Power Control Analysis for Multiple-Receiver Wireless Power Transfer Systems 下载免费PDF全文
As different power has its own receivers, this paper analyzes and designs a multiple-receiver wireless power transfer (WPT) system systematically. The equivalent circuit model of the system is established to analyze the key parameters including transmitter power, receiver power, transmission efficiency, and each receiver power allocation. A control circuit is proposed to achieve the maximum transmission efficiency and transmitter power control and arbitrary receiver power allocation ratios for different receivers. Through the proposed control circuit, receivers with different loads can allocate appropriate power according to its power demand, the transmitter power and system efficiency do not vary with the change of the number of receivers. Finally, this control circuit is validated using a 130-kHz WPT system with three receivers whose power received is 3:10:12, and the overall system efficiency can reach as high as 55.5%. 相似文献
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采用0.18μm CMOS工艺设计并制作了一款应用于便携式UHFRFID阅读器的射频发射前端电路。所设计的有源I/Q上混频器通过开关控制Q支路的信号输入,实现了EPC Global Class-1Gen-2协议中所要求3种调制方式;驱动放大器通过实现增益7级数字可调有效地预放大混频器的输出信号。在1.8V的电源电压下,测得阅读器前端电路的主要性能参数如下:上混频器的输入端P1dB,达到-14.9dBVrms,转换增益和噪声系数分别为3.18dB和13.20dB;驱动放大器的输出端P1dB在50Ω阻抗上达到3.5dBm,转换增益可调范围和噪声系数变化范围,分别为7.90~16.30dB和3.10~5.00dB。 相似文献
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《IEEE transactions on information theory / Professional Technical Group on Information Theory》2009,55(6):2499-2517
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120-GHz wireless link using photonic techniques for generation, modulation, and emission of millimeter-wave signals 总被引:1,自引:0,他引:1
We present a wireless link system that uses millimeter-wave (MMW) photonic techniques. The photonic transmitter in the wireless link consists of an optical 120-GHz MMW generator, an optical modulator, and a high-power photonic MMW emitter. A uni-traveling carrier photodiode (UTC-PD) was used as the photonic emitter in order to eliminate electronic MMW amplifiers. We evaluated the dependence of UTC-PD output power on its transit-time limited bandwidth and its CR-time constant limited bandwidth, and employed a UTC-PD with the highest output power for the photonic emitter. As for the MMW generation, we developed a 120-GHz optical MMW generator that generates a pulse train and one that generates a sinusoidal signal. The UTC-PD output power generated by a narrow pulse train was higher than that generated by sinusoidal signals under the same average optical power condition, which contributes to reducing the photocurrent of the photonic emitter. We have experimentally demonstrated that the photonic transmitter can transmit data at up to 3.0 Gb/s. The wireless link using the photonic transmitter can be applied to optical gigabit Ethernet signals. 相似文献
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Ryckaert J. Van der Plas G. De Heyn V. Desset C. Van Poucke B. Craninckx J. 《Solid-State Circuits, IEEE Journal of》2007,42(12):2860-2869
We propose an all-digital UWB transmitter architecture that exploits the low duty cycle of impulse-radio UWB to achieve ultra-low power consumption. The design supports the IEEE 802.15.4a standard and is demonstrated for its mandatory mode. A digitally controlled oscillator produces the RF carrier between 3 and 10 GHz. It is embedded in a phase-aligned frequency-locked loop that starts up in 2 ns and thus exploits the signal duty cycle that can be as low as 3%. A fully dynamic modulator shapes the BPSK symbols in discrete steps at the 499.2 MHz chip rate as required by the standard. The transmitter can operate in any 499.2 MHz band of the standard between 3.1 and 10 GHz, and the generated signal fulfills the emission spectral mask. The jitter accumulation over a burst is below 6 psRMS, which is within specifications. The transmitter was realized in a 1 V 90 nm digital CMOS technology, and its power consumption drawn from a 1 V supply is from 0.65 mW at 3.1 GHz to 1.4 mW at 10 GHz for a 1 Mb/s data rate. 相似文献
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A supervising instrument designed to measure the operating states of a high-power, medium-wave AM radio transmitter and its peripheral devices is described. The instrument can be used to measure the load impedance, output power, and efficiency of the final stage amplifier of the medium wave AM radio transmitter and can be used as a data logging and data analyzing instrument when the GP-1 B digital and analog interfaces are attached to the devices 相似文献