Transcript here - Roadrunners Microwave Group

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!