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From the analysis, it is indicated that for broader band amplification in a helical groove travelling wave tube, a ridged helical structure with shallow groove and loaded by dielectric with proper relative permitivety may be applied.


The transmitter utilizes two Travelling Wave Tube Amplifiers for redundancy.


For magnetic resonance measurements, the sample was mounted on a miniaturized loop connected to a 40W travelling wave tube amplifier.


Development of lightweight antennas and highly efficient travelling wave tube amplifiers and solidstate RF amplifiers are required.




 The method of designing the slowwave system for inductive coupled cavity chain which has been used in the highpower travellingwave tube is described in detail. A slowwave system of 30 KV electron beam voltage has been designed and constructed. The dispersion characteristic and the interaction impedance of the system has been measured. From the comparison of the measured values with the corresponding calculated values of the dispersion characteristic, it is noticed that the... The method of designing the slowwave system for inductive coupled cavity chain which has been used in the highpower travellingwave tube is described in detail. A slowwave system of 30 KV electron beam voltage has been designed and constructed. The dispersion characteristic and the interaction impedance of the system has been measured. From the comparison of the measured values with the corresponding calculated values of the dispersion characteristic, it is noticed that the difference between the theoretical value and its experimental result of the upper cutoff frequency is only about 0.6%, for the lower cutoff frequency about 2.8%.  本文提出了用于大功率行波管的电感偶含谐振腔链型慢波系统的设计方法，用此方 法设计出了一套电子注电压为３０千伏的慢波系统，对此系统进行了色散特性和偶合阻 抗的测量。对色散特性进行了实验和理论比较。比较表明，计算的上截止频率和实测结 果相差只有０．６％，下截止频率相差２．８％。  The method of designing the slowwave system for inductive coupled cavity chain which has been used in the highpower travellingwave tube is described in detail. A slowwave system of 30 KV electron beam voltage has been designed and constructed. The dispersion characteristic and the interaction impedance of the system has been measured. From the comparison of the measured values with the corresponding calculated values of the dispersion characteristic, it is noticed that the difference... The method of designing the slowwave system for inductive coupled cavity chain which has been used in the highpower travellingwave tube is described in detail. A slowwave system of 30 KV electron beam voltage has been designed and constructed. The dispersion characteristic and the interaction impedance of the system has been measured. From the comparison of the measured values with the corresponding calculated values of the dispersion characteristic, it is noticed that the difference between the theoretical value and its experimental result of the upper cutoff frequency is only about 0.6%, for the lower cutoff frequency about 2.8%.  本文提出了用于大功率行波管的电感偶含谐振腔链型慢波系统的设计方法,用此方法设计出了一套电子注电压为30千伏的慢波系统,对此系统进行了色散特性和偶合阻抗的测量。对色散特性进行了实验和理论比较。比较表明,计算的上截止频率和实测结果相差只有0.6%,下截止频率相差2.8％。  This paper presents a method of calculation of the noise figure of power travelling wave tubes which employ a conical Pierce gun to produce the electron beam. Under the assumption that the electron beam is singlevelocity and onedimensional, the transmission equation of space charge wave set up in the conical electron beam is derived and the process of noise impedance transformation is obtained. Theoretical calculations show that changing the convergence angle, the radius of curvature, the anode... This paper presents a method of calculation of the noise figure of power travelling wave tubes which employ a conical Pierce gun to produce the electron beam. Under the assumption that the electron beam is singlevelocity and onedimensional, the transmission equation of space charge wave set up in the conical electron beam is derived and the process of noise impedance transformation is obtained. Theoretical calculations show that changing the convergence angle, the radius of curvature, the anode voltage and the length of the drift region can reduce the noise figure of a power travelling wave tube. Theoretical results presented in this paper are examined with the experimental noise figure values of a few of practical tubes.  本文给出了采用球形收敛枪的功率行波管噪声系数的计算方法。在单速、一维假定下,推导了球形收敛电子注上的空间电荷波传播方程和噪声阻抗的变换过程。计算表明:改变收敛角、阴极曲率半径、阳极电压及漂移区长度等,可以使功率行波管获得较低的噪声系数。通过几个实际管子噪声系数的测量,对本文所得的结果进行了验证。   << 更多相关文摘 
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