Showing papers by "Daniel J. Hoppe published in 1992"
TL;DR: The conceptual design of the 1 MW X-band transmit system for the Goldstone Solar System Radar represents the next step in the quest to expand planetary radar exploration as mentioned in this paper, and the radar transmitter requirements are summarized.
Abstract: The conceptual design of the 1 MW X-band transmit system for the Goldstone Solar System Radar represents the next step in the quest to expand planetary radar exploration. The radar transmitter requirements are summarized. The characteristics and expected performance of the major elements are discussed, including the klystrons, power amplifiers, microwave transmission lines, feed systems, beam power supply, heat exchanger, phase stable exciter, and the monitor/control system. An assessment of the technology development needed to meet the system requirements is given, and possible areas of difficulty are outlined. >
4 citations
01 Jan 1992
TL;DR: In this article, a beam waveguide (BWG) design suitable for high-power applications is described, which features a transmit-only, four-port high-gain horn as input to a BWG system with a single parabolic mirror and three flat plates.
Abstract: A beam waveguide (BWG) design suitable for high-power applications is described. The design features a transmit-only, four-port high-gain horn as input to a BWG system with a single parabolic mirror and three flat plates. The use of a single parabolic mirror is such that the highest field concentration is no greater than that caused by the horn itself. The horn is linearly polarized and a grid reflector is used to reflect the orthogonal polarization into the receive feed. A rotatable dual polarizer provides for arbitrary transmit polarization. The dual-reflector system is shaped to provide uniform illumination over the main reflector and therefore maximum gain for the given size aperture. Measured data from a scale model BWG system are presented.
3 citations
01 Jun 1992
TL;DR: A power combiner using a polarization-sensitive quasi-optical grid has been designed to operate at 8.5 GHz and 1 MW (continuous wave) for imaging planets and asteroids.
Abstract: A power combiner using a polarization-sensitive quasi-optical grid has been designed to operate at 8.5 GHz and 1 MW CW (continuous wave). The CW radar at 8.5 GHz is operated by NASA's Jet Propulsion Laboratory at Goldstone, California, for imaging planets and asteroids. The combiner has been successfully tested at 500 kW CW. The design and operating principle are discussed, and the evaluation facilities and instrumentation used in high-power testing are presented. >
1 citations
01 Jun 1992
TL;DR: In this paper, an electroformed X-band resonant ring has been constructed to conduct breakdown experiments with dielectric gases, which is a tuned closed waveguide loop fed by a microwave power source.
Abstract: An electroformed X-band resonant ring has been constructed to conduct breakdown experiments with dielectric gases. The resonant ring is a tuned closed waveguide loop fed by a microwave power source, and is capable of power multiplication. The authors introduce the design and techniques employed in the fabrication of the resonant ring, and present gas breakdown results obtained using nitrogen and sulphur hexafluoride. >