共查询到20条相似文献,搜索用时 78 毫秒
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本文介绍了一种由正交E面折叠魔T与鳍线混合集成的Ka波段单平衡混频器的研制概况,混频器使用国产W121封装的带状引线混频二极管。介质基片采用国产的仿RT-Duroid5880,经测试该混频器的最小单边带噪声为5.7dB(不包括前中噪声),射频与本振的隔离度均优于20dB,整体尺寸为32×19×14(mm)。 相似文献
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微波二极管变频器的频域分析 总被引:2,自引:1,他引:1
本文采用频域延拓交调波平衡法(FDCIBM)分析微波二极管变频器,讨论了本振(LO)和中频(IF)(或LO和射频(RF))输入均为大信号时的变频器分析,推导了上,下变频器统一的频域交调波平衡方程,并给出了一个微波巴伦二极管上变频器的分析和测量结果。 相似文献
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一种新型微波手术设备OnaNovelMicrowaveSurgicalOperationalInstrument¥//刘健(西安理工大学自动化系,西安710048)利用微波能的热效应实现外科手术止血的微波手术刀已经商品化,但微波泄瞩的防护问题没有满意... 相似文献
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本文介绍了移相级联式高压变频器的结构、特点。这种高压变频器所用功率器件少,负荷均衡,输入输出线性度好,具有良好的控制特性。 相似文献
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将微波介质谐振器应用于阶跃管高次倍频器中,这是一种新的尝试.由此构成的微波高次倍频器,既具有微波集成高次倍频器体积小、重量轻、加工简单的特点,又具有微波同轴腔高次倍频器对相邻谐波抑制度高的优点.因而是一种在星、弹航天设备中非常有用的微波固态源部件.已研制成的C波段22次倍频器,集成在两块20×60×1mm的氧化铝陶瓷基片上,对相邻谐波的抑制,在-40℃~+70℃温度范围内优于-50dB. 相似文献
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研制的4.3GHz无线电高度表微波集成前端已得到实际应用,它代替了整机原用的振荡-放大一倍频方案,提高了效率、减小了体积.微波集成前端采用了高线性度FET压控振荡器作发射源,采用高隔离度的单桥路不等负载三分贝混合环混频器.在-40°~70℃的环境温度范围内发射功率大于150mW,压控带宽123MHz,线性度小于3%,接收机噪声系数小予8dB. 相似文献
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针对卫星通信的需求,提出了一种谐波混频结合宽带匹配滤波电路的设计方法.采用小型化平行耦合微带滤波器,利用高频场仿真软件和谐波平衡仿真软件,研制了小型化的极高频(Ex-tremely High Frequency,EHF)上变频器,实现了变频、滤波、驱动放大一体化设计.模块集成度高,结构简单,体积小,测试结果表明其技术指... 相似文献
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本文研究了一种新型的微波开关.利用震荡电路产生频率为50Hz(占空比为1%)的低频信号,低频信号通过施密特触发器得到10GHz的高频信号,然后通过高频振荡器发射微波束.利用波束障碍原理,当接收振荡器接收到的微波束经过滤波、放大、解调后,控制芯片(MSP430F149)对得到的幅值、低频频率、高频频率等参数进行判断,从而... 相似文献
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《Optical Fiber Technology》2013,19(4):319-324
The chromatic dispersion (CD) is a key parameter for optical fibers. Based on the microwave interference effect, a new method for CD measurement of optical fibers is proposed. The radio frequency (RF) signals carried by two light-waves with different wavelengths transmit through the dispersive optical fiber under test. After photo-detector they interfere with each other due to the different phase shifts induced by the CD of fiber. The CD can be obtained by monitoring the changing interference RF power with scanning the wavelength of tunable laser source. The CD values of single mode fiber and dispersion compensating fiber are measured within the wavelength range from 1525 to 1605 nm. The common phase shift method is used to measure the CDs of the two types of fiber, which demonstrates the feasibility and veracity of the proposed method. 相似文献
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A novel efficient circuit for Ultra-WideBand (UWB) balanced sub-nanosecond monocycle pulse generation is presented. The pulse generator employs wideband bipolar transistor, step recovery diodes, Schottky diodes, and simple charging and discharging circuitry. Simple transient analysis and design of the circuit are presented along with their operating principle. The pulse generator produces truly balanced monocycle pulse with 500 ps pulse-width and 800 mV peak voltage. The generated monocycle pulse also has very symmetrical positive and negative portions and low ringing level. The presented pulse generator can be used as both a transmitter feeding UWB balanced antennas without broadband baluns and a balanced switching pulse generator that used in UWB receiver. 相似文献
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Signetics SD 200 microwave n-channel MOSFETs show a type of flicker noise in the 4–30 MHz frequency range for which the product of the noise resistance Rn and the transconductance gm is practically independent of operating conditions. Since this conflicts drastically with Klaassen's theory of flicker noise in MOSFETs, which is backed up by considerable experimental evidence, it is concluded that this represents a new type of flicker noise. 相似文献
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本文设计了一种新型硅基MEMS集成光强调制型光波导加速度传感器,在同一 集成了分束器、悬臂梁、质量块、光波导、光探测器等元件,解决了光纤传感器向微型化发展时遇到的装配困难及长期稳定性差等问题,讨论了利用现有工艺在硅基片上实现MEMS集成光波导加速度传感器的可行性。 相似文献
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已经研制成功30GHz接收机用的几种单片集成电路.低噪声放大器芯片在14dB增益时噪声系数为7.dB,中频放大器在30dB控制范围内,增益为13dB.混频器和移相器变频损耗和插入损耗分别为10.5dB和1.6dB. 相似文献