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Transcript
Simple, Efficient Microwave Hybrid Power Dividers By Robert J. Templin W5OE Roadrunners Microwave Group Reasons for Hybrids • EME and other applications require higher microwave power • High power MW amps are TWTs or other high voltage devices not happy to sit out at the antenna feed point Reasons for Hybrids • With high-power MW amps in the shack, line losses are significant • A 200 W amp in the shack with a 3 db line loss is only 100 W at the feed Reasons for Hybrids • High power MW solid state amps operate at 28 volts and can be placed at the feed point • Line losses are eliminated • High power MW amps can be combined with hybrids to outpower TWT’s Eu design Hybrid Combiner N6CA 23cm ring-hybrid using tubing for the ring - Tubular ring element is a problem for other bands N6CA design ring-hybrid using flat stock for ring Easy to adapt to any band Critical Dimensions • Radius A • 1.5l Divided by 2p (0.2387 free space l) • Radius B • Radius A minus .125” • Radius C • Radius A plus .125” • Spacing • 0.100” for all bands Critical Dimensions • Connector electrical spacing 90, 90, 90, 270 degrees • Linear Spacing A, A, A ,2A Precautions • Microwaves at high power levels deserve biological care! • You wouldn’t stick your head in a microwave oven, don’t get near high power feeds!