simple, efficient microwave hybrid power dividers by robert j. templin w5oe roadrunners microwave...

Simple, Efficient MicrowaveHybrid Power Dividers

By Robert J. TemplinW5OE

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

• Radius B

• Radius C

• Spacing

• 1.5 Divided by 2 (0.2387 free space )

• Radius A minus .125”

• Radius A plus .125”

• 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!