Computer simulations of twice oversized n-GaAs diodes with random doping fluctuations operated in a transmission line (multiresonant) circuit are presented. LSA operation in this multiresonant circuit, which provides ...
详细信息
Computer simulations of twice oversized n-GaAs diodes with random doping fluctuations operated in a transmission line (multiresonant) circuit are presented. LSA operation in this multiresonant circuit, which provides an RF square wave voltage across the diode, has been obtained for n/f ratios as high as 1 106s/cm3.
The integrated transistorized dipole antennafier (antenna-amplifier) is ideally suited for use in array systems. The advantages include ease of amplitude-distribution control, low noise, high gain, high reliability an...
详细信息
The integrated transistorized dipole antennafier (antenna-amplifier) is ideally suited for use in array systems. The advantages include ease of amplitude-distribution control, low noise, high gain, high reliability and simplicity. The integration is achieved by using the antenna as a circuit element of the transistorized amplifier, thus eliminating the tuned input circuits and transmission lines commonly used. A four-element broadside array of antennafiers is described in which the gain of each element is varied by controlling the base bias. Binomial, uniform, edge and Dolph-Chebyshev distributions were chosen to show the wide variation of beam control possible; the resulting measured and calculated patterns, half-power beamwidths, gain over a half-wavelength dipole, and noise temperatures are presented. A method of experimentally evaluating the noise performance, based on a theoretical development, is also described.
From a linear analysis of a tunnel diode loaded with a transmission line, it is shown that oscillations highly stable in frequency are possible. Preliminary experimental results are in agreement with the theory. Stabi...
详细信息
From a linear analysis of a tunnel diode loaded with a transmission line, it is shown that oscillations highly stable in frequency are possible. Preliminary experimental results are in agreement with the theory. Stability on the order of one part in 10/SUP 5/ is easily attained.
A theory of a ferromagnetic traveling-wave amplifier of parametric type is presented here. Amplification of signal power in the form of growing waves is obtained in a propagating structure which is partially or totall...
详细信息
A theory of a ferromagnetic traveling-wave amplifier of parametric type is presented here. Amplification of signal power in the form of growing waves is obtained in a propagating structure which is partially or totally embedded in a ferromagnetic medium. The structure, in one of its possible forms, possesses two propagating modes: one of the modes is excited by a signal at the input end, and the other is used as an idling circuit. The structure should also support a traveling wave supplied by a local oscillator which provides, through the motion of the magnetization, a time-varying coupling between the two propagating modes. The problem is essentially that of two coupled transmission lines with a time-dependent coupling coefficient. Optimum conditions for amplification are derived. A structure consisting of two pairs of parallel wires is calculated to illustrate the general principles.
暂无评论