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1981 Vol. 3, No. 3
Display Method:
1981, 3(3): 137-142.
Abstract:
In this paper the element pattern-steerable adaptive circular arrays are described. The element consists of three-orthogonal dipoles. All the element radiation patterns in the array can be steered by a set of weightings to point to an arbitrary speci...
In this paper the element pattern-steerable adaptive circular arrays are described. The element consists of three-orthogonal dipoles. All the element radiation patterns in the array can be steered by a set of weightings to point to an arbitrary speci...
1981, 3(3): 143-151.
Abstract:
This report covers the studies of the characteristics of the scattering patterns from a subreflector of the modified monopulse dual reflector antennas. In this report, at first the basic computed formulas of the far-field sum and difference scatering...
This report covers the studies of the characteristics of the scattering patterns from a subreflector of the modified monopulse dual reflector antennas. In this report, at first the basic computed formulas of the far-field sum and difference scatering...
1981, 3(3): 152-159.
Abstract:
A review is made of recent progress in the study of oxide cathodes using surface techniques. Beginning with the careful and rather detailed studies of the thermionic properties of BaO, (thus leading to the Ir-BaO cathode initiated by the NRL group) w...
A review is made of recent progress in the study of oxide cathodes using surface techniques. Beginning with the careful and rather detailed studies of the thermionic properties of BaO, (thus leading to the Ir-BaO cathode initiated by the NRL group) w...
1981, 3(3): 160-166.
Abstract:
In an O type high power travelling wave tube (TWT), its power capacity is determined by the heat conduction characteristic of the slow wave structure (SWS). When the open type SWS is supported by dielectric rods of trapezoid shape in cross section, t...
In an O type high power travelling wave tube (TWT), its power capacity is determined by the heat conduction characteristic of the slow wave structure (SWS). When the open type SWS is supported by dielectric rods of trapezoid shape in cross section, t...
1981, 3(3): 167-172.
Abstract:
This paper explains the image expansion and confusion of the red and blue primary colours caused by the electric charge accumulation on the oil film in the colour TV light valve tube.
This paper explains the image expansion and confusion of the red and blue primary colours caused by the electric charge accumulation on the oil film in the colour TV light valve tube.
1981, 3(3): 173-184.
Abstract:
In this paper the self-sharpening effect of electron beam landing on the target in a vidicon and its influence on resolution of electron beam have been digitally analyzed with computer. The mathematical-physical models applied are as follows: The dis...
In this paper the self-sharpening effect of electron beam landing on the target in a vidicon and its influence on resolution of electron beam have been digitally analyzed with computer. The mathematical-physical models applied are as follows: The dis...
1981, 3(3): 185-190.
Abstract:
The long pulse electron beam system reported here was constructed for transverse pumping and e-beam sustained discharge large energy gas laser. The electron beam parameters are: the beam energy about 200-250 keV, pulse duration (PWHM) about 1-3s, cur...
The long pulse electron beam system reported here was constructed for transverse pumping and e-beam sustained discharge large energy gas laser. The electron beam parameters are: the beam energy about 200-250 keV, pulse duration (PWHM) about 1-3s, cur...
1981, 3(3): 191-192.
Abstract:
A dispenser cathode which consists of a porous body of tungsten impregnated with barium scandate has been developed. It has good properties: high emission current density, low evaporation rate, good reactivation ability after poisoning and long life....
A dispenser cathode which consists of a porous body of tungsten impregnated with barium scandate has been developed. It has good properties: high emission current density, low evaporation rate, good reactivation ability after poisoning and long life....
1981, 3(3): 193-195.
Abstract:
In this paper the effects of dielectric sheet on the array antenna are described on the concept of element cell. The formulae suitable for the computer calculation are derived by the use of transmission line circuit theory. Useful results are obtaine...
In this paper the effects of dielectric sheet on the array antenna are described on the concept of element cell. The formulae suitable for the computer calculation are derived by the use of transmission line circuit theory. Useful results are obtaine...
1981, 3(3): 196-200.
Abstract:
An improved algorithm for FFT is proposed. The Fourier transforms of a complex discrete sequence with N = 2r points are performed by the operation of (-3) N/2 times of multiplication. The speed of the algorithm is faster than the conventional FFT. Th...
An improved algorithm for FFT is proposed. The Fourier transforms of a complex discrete sequence with N = 2r points are performed by the operation of (-3) N/2 times of multiplication. The speed of the algorithm is faster than the conventional FFT. Th...
