Showing papers on "Ka band published in 1978"
01 Mar 1978
TL;DR: In this paper, the feasibility of using various types of radars including dual wavelength configurations for arriving at slant path attenuations through rain and cloud at frequencies up to 100 GHz has been analyzed.
Abstract: : The feasibility of using various types of radars including dual wavelength configurations for arriving at slant path attenuations through rain and cloud at frequencies up to 100 GHz has been analyzed. Optimum performance parameters of systems which best perform these functions are established. The configurations examined include single S-band (f = 3 GHz) and K sub u-band (f = 15.7 GHz) systems as well as dual wavelength systems operating at K sub a-S (35-3 GHz) and K sub u-S (15.7-3 GHz) bands. The following conclusions have been arrived at from the analysis of the above systems: (1) Of the various systems examined, the most straightforward is an S-Band system monitoring the path reflectivity profiles. (2) The use of a single attenuation wavelength radar (e.g., one operating at 15.7 GHz) for measuring rain path attenuation leads to unacceptably high errors and should be avoided. (3) A radar system operating at 15.7 GHz is suitable for estimating cloud liquid water content from which cloud path attenuation may be determined at frequencies above 10 GHz. (4) A dual wavelength system involving K sub a and S-band (35-3 GHz) radar system is feasible for establishing drop size distributions aloft from which appropriate empirical relations at higher frequencies may be generated. (5) A K sub u-S band (15.7-3 GHz) dual wavelength system may give rise to unacceptably large errors and its use should be avoided. (Author)
1 citations
01 Oct 1978
TL;DR: In this article, two types of TWT have been developed: a Ka band tube with an output power exceeding 1 kW in the band 36.7 to 38.2 GHz (1) and a Q band (40 to 50 GHz) TWT with output power of more than 400 W (2).
Abstract: For mobile millimeter wave satellite communications terminals two types of TWT have been developed: A Ka band tube with an output power exceeding 1 kW in the band 36.7 to 38.2 GHz (1) and a Q band (40 to 50 GHz) TWT with an output power of more than 400 W (2). Additionally a 30 GHz 1 kW TWT is presently being developed under contract to the German Space Administration.
27 Jun 1978
TL;DR: In this paper, the static and dynamic stability results achieved with Ka band Impatt oscillators are presented, and the design features needed to achieve these results and the critical measurement problems are also considered.
Abstract: This paper presents some static and dynamic stability results achieved with Ka band Impatt oscillators. The design features needed to achieve these results and the critical measurement problems are also considered.