Accession Number : AD0427867


Title :   TUNNEL DIODES FOR PHASED ARRAY RADAR.


Descriptive Note : Quarterly progress rept. no. 2, 10 Oct 6320 Jan 64.


Corporate Author : GENERAL ELECTRIC CO SYRACUSE N Y


Report Date : 20 Jan 1964


Pagination or Media Count : 45


Abstract : Research was continued on the development of tunnel diodes for use in phased array radars. This includes device work for both germanium and gallium antimonide, resistance package, high frequency measurement, low frequency noise measurement and S-Band amplifier. Work was carried out to determine the noise characteristics of germanium tunnel diodes. Data were taken on approximately two hundred germanium diodes to determine the effect of diode parameters on the noise figure index. Considerable work was done in the area of gallium antimonide sandwich pellet fabrication. Various lapping and etching treatment on the GaSb wafer and different kinds of glass were tried without any positive results. High frequency measurements were made on the stabilizing resistance packages. After these measurements, tunnel diode junctions were formed on the packages and high frequency measurements were again made. Then the shunt resistors were removed and measurements were made once more in order to compare the results of the direct and indirect measurement methods. Low frequency tunnel diode shot noise was measured for three germanium diodes. A S-band amplifier was constructed and tested. The stability, gain, tuning range and interchangeability of diodes were found to be excellent. However, the contact mechanisms of the stabilizing resistor and short stubs were not good enough to avoid contact noise. A new amplifier will be built with an improved contact mechanism. (Author)


Descriptors :   *MICROWAVE AMPLIFIERS , RADAR EQUIPMENT , TUNNEL DIODES , CHEMICAL MILLING , S BAND , GERMANIUM , GALLIUM ALLOYS , ANTIMONY ALLOYS , CONTAINERS , NOISE(RADIO) , SANDWICH CONSTRUCTION , RESISTORS , STABILIZATION , GLASS , STABILITY , GAIN , ADMITTANCE , WAVEGUIDE CIRCULATORS , TUNED AMPLIFIERS


Distribution Statement : APPROVED FOR PUBLIC RELEASE