共查询到18条相似文献,搜索用时 93 毫秒
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Ku 波段回旋行波管设计与分析 总被引:1,自引:1,他引:0
设计了用于Ku波段的介质加载回旋行波管。阐述了磁控注入电子枪的设计,采用均匀介质加载的结构来抑制回旋行波管的自激振荡,降低了回旋行波管的起振电流,同时提高了寄生模式的起振长度。设计了线极化输入耦合器。设计的回旋行波管工作电压为70kV,工作电流为10A,最大峰值功率210kW,最大功率处增益为35dB,3dB带宽为1.8GHz。 相似文献
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我国各地生产的10kW脉宽调制发射机的杂散辐射相对于载波场强来说,一般为—60~—70dB。为改善这项指标,我们做了一些工作,并取得一定成果。我们在一部200kW脉宽机上实验,其天线主向上的杂散辐射达到—80dB。以后将此经验用于黑龙江广播设备制造厂生产的10kW脉宽机,使杂散辐射也达到小于—80dB的水平。例如黑龙江省某转播台10kW脉宽机,在距天线约700米处,实测杂散辐射为—87dB。 相似文献
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淄博电视台发射中心使用的四频道1kW电视发射机是北京广播器材厂20世纪80年代生产的低电平中频调制,单通道电视发射机,使用了将近20年。该机使用全分立元件的视、音频激励器(厚46cm,宽78cm,高53.5cm,由3层3U高的标准机柜组成),输出功率为1W,整机使用两只电子管功率放大器:前机用620F,输出功率50W,增益17dB;末机用732F,增益14dB,输出功率1kW。全分立元件的激励器参数易变,指标变化范围较大,稳定性较差;电子管容易老化,容易发生栅阴热碰极,工作中易发生打火,需要经常地对其工作状态… 相似文献
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利用奇偶模分析法对定向耦合器进行基本的描述与分析,利用HFSS软件辅助设计了一种三节3 dB定向耦合器。为解决此耦合器耐压低的问题,在耦合器的上下两板间引入了绝缘介质,设计了一种耦合为3 dB,最大输入功率不低于17 kW的定向耦合器。加入耦合介质,除了可以提高耦合器的输入功率外,还可缩减耦合器的尺寸,减小耦合器质量,并节约材料成本,从而实现了3 dB定向耦合器的高功率及小型化设计。 相似文献
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WangYong DingYaogen ZhangJian WangShuguo XuMiaoling JiangZhenbo LuXi 《电子科学学刊(英文版)》2004,21(6):522-524
This letter introduces the design ideas, simulation and test results of an S-band klystron with bandwidth of 11%, which was developed by the Institute of Electronics, Chinese Academy of Sciences (IECAS).On the peak power level of 800 kW, the efficiency of klystron is more than 30%; the gain is more than 41 dB; the equal-driving relative instantaneous bandwidth is over 11%; the average power is larger than 8kW, and the power fluctuation within bandwidth is less than 1o5 dB. 相似文献
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设计了一种工作在L波段,带宽为100MHz,占空比为8%,脉冲宽度为100μs的3kW固态功率放大组件。组件采用两级放大,末级采用低插损的Wilkinson合成器合并4个850W高功率放大模块。通过优化匹配电路设计、合理选择储能电容和优化电路热设计,改善了组件增益平坦度和脉冲顶降,提高了组件热可靠性。测试结果表明,该功放在工作频率范围内输出功率>3kW,效率>30%,增益平坦度为0.3dB,脉冲顶降<0.8dB。 相似文献
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S波段1kW固态功率放大组件 总被引:1,自引:0,他引:1
设计了一种工作在S波段,频带宽度为400MHz,平均占空比≤10%,脉冲宽度≤200μs的1kW固态功率放大组件。组件采用四级放大结构,将5mW左右的激励信号放大到1kW,通过优化晶体管输入/输出匹配电路,应用三级Wilkinson功分/合成器,改善了组件增益平坦度和效率。测试结果表明,该组件在工作频率范围内输出功率≥1.2kW,效率≥30%,增益平坦度≤1.2dB。 相似文献
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J. J. Choi 《Journal of Infrared, Millimeter and Terahertz Waves》1998,19(12):1681-1691
A design study of a high efficiency/gain gyroklystron amplifier is performed to demonstrate amplified radiation power of 200kW operating at 28GHz. A key design feature of the present gyroklystron amplifier is that the amplifier is designed to be high gain so that it can be saturated by a low power solid state power amplifier. A non-linear, time-dependent, large signal numerical code is used to predict tube performance. Simulations predict that a stable amplifier radiation power of 214kW is produced with a saturated gain of 54dB, an electronic efficiency of 37%, and a frequency bandwidth of 0.3% from a five-cavity gyroklystron amplifier. The amplifier gain is found to be very sensitive to a beam velocity spread. 相似文献
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Camara N. Zekentes K. Romanov L.P. Kirillov A.V. Boltovets M.S. Vassilevski K.V. Haddad G. 《Electron Device Letters, IEEE》2006,27(2):108-110
The 4H-SiC p-i-n diodes were designed, fabricated, and characterized for use in microwave applications. The diodes with mesa structure diameters between 80 and 150 /spl mu/m, exhibited a blocking voltage of 1100 V, a 100-mA differential resistance of 1-2 /spl Omega/, a capacitance below 0.5 pF at a punchthrough voltage of 100 V and a carrier effective lifetime between 15-27 ns. X-band microwave switches based on 4H-SiC p-i-n diodes are demonstrated for the first time. The switches exhibited insertion loss as low as 0.7 dB, isolation up to 25 dB and were able to handle microwave power up to 2.2 kW in isolation mode and up to 0.4 kW in insertion mode. 相似文献
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We report on stimulated Raman multi-Stokes scattering and Raman amplification in slightly multimode fluoride glass fibres. Raman gain in excess of 40 dB has been obtained in an 18 ?m-diameter, 10 m-long fibre with a pump power in the order of 1 kW. 相似文献