Engineering topics
Publications and source records attributed to Kummer, W. H..
Simultaneous two-way communication at 20 and 30 GHz is possible with versatile paraboloid-dish antenna. Developed for two-way communications between Space Shuttle and ground station, antenna includes parabolic reflector, feed horn, waveguide network, and single-axis gimbal mounting. System resolution and accuracy are better than 1 percent.
The practicability of a multi-frequency antenna for spaceborne microwave radiometers was considered in detail. The program consisted of a comparative study of various antenna systems, both mechanically and electronically scanned, in relation to specified design goals and desired system performance. The study involved several distinct tasks: definition of candidate antennas that are lightweight and that, at the specified frequencies of 5, 10, 18, 22, and 36 GHz, can provide conical scanning, dual linear polarization, and simultaneous multiple frequency operation; examination of various feed systems and phase-shifting techniques; detailed analysis of several key performance parameters such as beam efficiency, sidelobe level, and antenna beam footprint size; and conception of an antenna/feed system that could meet the design goals. Candidate antennas examined include phased arrays, lenses, and optical reflector systems. Mechanical, electrical, and performance characteristics of the various systems were tabulated for ease of comparison.
A large multi-function antenna aperture and related components are described which will perform electronic steering of one or more beams for two of the three applications envisioned: (1) communications, (2) radar, and (3) radiometry. The array consists of a 6-meter folded antenna that fits into two pallets. The communications frequencies are 20 and 30 GHz, while the radar is to operate at 13.9 GHz. Weight, prime power, and volumes are given parametrically; antenna designs, electronics configurations, and mechanical design were studied.
This is a survey paper wherein phased array antenna systems, now operating on spacecraft, are reviewed so as to reveal their basic techniques of beam formation, steering, and receive/transmit (transponder) functions. Laboratory developmental antennas, designed for ultimate spacecraft flight qualification, are assessed in terms of the needs of communications, earth resources instrumentation, and area surveillance.
Evaluation of phased array antennas for spacecraft communications and surveillance systems
Engineering model of high gain self steering microwave transponder and application to satellite communication links
High gain self steering repeater for multibeam microwave array system for earth-satellite communications
High gain self steering microwave repeater for earth-satellite communications noting design, performance and results of color TV transmissions
Advanced antenna techniques for rendezvous and lunar landing radar systems
Diode-iris controlled waveguide slot radiators
Deep space communication system requirements for period 1970 to 1980
Electronic self-steering techniques applied to satellite communications systems with high gain antennas, noting transdirective array and self- phasing array
Spacecraft communication system with reliable, beam-steering antenna
Electronic self-steering techniques applied to satellite communications system with high gain antennas, noting transdirective array and self- phasing array
Tracking antenna for spacecraft communications system