code. High efficiencies, greater than 35 percent, have been found at the mth cyclotron harmonic. The effect on the efficiency of an initial velocity spread in the electron beam has also been considered. (Author) Source of Abstract (Subfile): AIAA/TIS Descriptors: *COMPUTERIZED SIMULATION; *CYCLOTRON RESONANCE DEVICES; * ELECTROMAGNETIC FIELDS; *ENERGY CONVERSION EFFICIENCY; *MASER OUTPUTS; *MICROWAVE OSCILLATORS; CYCLOTRON RADIATION; ELECTRON RADIATION; FIELD THEORY (PHYSICS); HARMONIC ANALYSIS; MICROWAVE RESONANCE; MILLIMETER WAVES; SUBMILLIMETER WAVES Subject Classification: 7533 Electronics & Electrical Engineering (1975- ) High-frequency resonant transistor dc-dc converters STEIGERWALD, R. L. (GE Research and Development Center, Schenectady, NY) IEEE Transactions on Industrial Electronics (ISSN 0278-0046), vol. IE-31, May 1984, p. 181-191. 10 Refs. Language: English Country of Origin: United States. Country of Publication: United States Document Type: JOURNAL ARTICLE Most documents available from AI A A Technical Library Journal Announcement: IAA8415 The design of a transistor dc-dc resonant converter operating at 200-300kHz is presented, and the operation of a 500-W breadboard version is reported. Several configurations of both voltage-input and current-input type are described and illustrated with circuit diagrams and waveforms, and a full-bridge voltage-input resonant inverter using gate turnoff devices is analyzed in detail, using a piecewise linear approach to obtain design curves. The performance of the breadboard voltage-input half bridge using FET power switches is shown in graphs, demonstrating the low switching losses and transistor stresses achieved by lossless-snubber design. It is predicted that similar designs using bipolar transistors or GTOs can attain energy efficiencies greater than 90 percent. Applications to switching power supplies and battery chargers are suggested. (T.K.) Source of Abstract (Subfile): AIAA/TIS Descriptors: *HIGH FREQUENCIES; *OFF-ON CONTROL; *POWER CONVERTERS; *RESONANT FREQUENCIES; *TRANSISTOR CIRCUITS; *VOL- TAGE CONVERTERS (DC TO DC); CAPACITORS; DESIGN ANALYSIS; ELECTRIC BRIDGES; FIELD EFFECT TRANSISTORS; POWER EFFICIENCY; SWITCHING CIRCUITS; WAVEFORMS Subject Classification: 7533 Electronics & Electrical Engineering (1975- ) Scanning pencil beam precision approach radar JOHNSON, R. E. (ITT Gilfillan, Van Nuys, CA) Electrical Communication (ISSN 0013-4252), vol. 58, no. 3, 1984, p. 299-304. Language: English Country of Origin: United States. Country of Publication: United States Document Type: JOURNAL ARTICLE Most documents available from AIAA Technical Library Journal Announcement: IAA8414 The PAR-80 scanning-pencil-beam ATC radar system is characterized and illus-
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