Microwave Antenna Systems Overview & Microwave Solid Antennas
1 Antenna Modeling software Ken Konechy W6HHC. 2 Antenna Modeling software teaches you more about...
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Transcript of 1 Antenna Modeling software Ken Konechy W6HHC. 2 Antenna Modeling software teaches you more about...
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Antenna Modelingsoftware
Ken Konechy W6HHC
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Ken Konechy W6HHC 2
Antenna Modelingsoftware
• teaches you more about antennas• how to design better antennas• how to predict antenna performance • how to “tune” for performance• lets you try “what if….”
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Ken Konechy W6HHC 3
“What is Antenna Modeling?”
• it is NOT making tiny models
• it is a computer program to predict and analyze antenna performance
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Ken Konechy W6HHC 4
“What is Antenna Modeling SW?”
• Allows you to describe an antenna• Allows you to describe your antenna height• Allows you to choose construction materials• Allows you to describe your ground conditions• Allows you to analyze gain• Allows you analyze impedance / SWR• Allows you to predict “band-width”• Allows you to plot directivity & front-to-back
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Ken Konechy W6HHC 5
Example of an Antenna Modeling Program
EZNEC Software Describing a 40M Inverted-Vee
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Ken Konechy W6HHC 6
Another Example of an Antenna Modeling Program
NEC-Win Describing a 10M 2-El Beam
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Ken Konechy W6HHC 7
Example of an Antenna Modeling Program
Select Material for a 10M Dipole
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Ken Konechy W6HHC 8
Example of an Antenna Modeling Program
Select “ground conditions” for a 10M Dipole
• NO GROUND – “free space conditions”
• PERFECT GROUND – “ The perfect world is simulated”
• SOMMERFELD GROUND – “Choose many real conditions”
• REAL GROUND – “Complex, allows nearby cliffs, hills, etc.”
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Ken Konechy W6HHC 9
Example of an Antenna Modeling Program
Select “Sommerfeld ground conditions”
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Ken Konechy W6HHC 10
Example of an Antenna Modeling Program
Gain plots for a 6-EL 20M Beam
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Ken Konechy W6HHC 11
Example of an Antenna Modeling Program
Predicting SWR for a 10M Dipole at 20ft
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Ken Konechy W6HHC 12
Let us Explore a 10M Dipole
Gain plots for 10M Dipole over different groundsHeight = 20 ft
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Ken Konechy W6HHC 13
Let us Explore a 10M Dipole
Gain plots for 10M Dipole at different heightsOver Sandy ground
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Ken Konechy W6HHC 14
Let us Explore a 10M Dipole
Gain plots for 10M Dipole at 5 degree Elev
10.7 dB of the gain is lost at 5 degrees!!!!!!
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Ken Konechy W6HHC 15
Let us Explore a 2-EL 10M Beam
Gain plots for 10M Beam at different heights
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Ken Konechy W6HHC 16
Explore Antenna Model for 30M Dipole
“Shortened” 30M Dipole Design(Four sections of Aluminum tubing)
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Ken Konechy W6HHC 17
Antenna Model for 30M Dipole
I wanted mast for 30M Dipole only 10-ft high(Horizontal dipole is a “cloud-warmer”)
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Ken Konechy W6HHC 18
Antenna Model for 30M Dipole
Horiz Shortened-Dipole Vert Shortened-Dipole
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Ken Konechy W6HHC 19
Antenna Model for 30M Dipole
Finished Construction of 30M Shortened-Dipole
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Ken Konechy W6HHC 20
Antenna Model for 1.2 GHz “Panel”
Six Loops of wire are positioned over a
Mesh Reflector for basic Panel Antenna
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Ken Konechy W6HHC 21
Antenna Model for 1.2 GHz “Panel”
Two sets of Six-Loop Arrays provide 3 dB More Gain for a Total of 17 dBd
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Ken Konechy W6HHC 22
Antenna Model for 1.2 GHz “Panel”
Large 6-loop panel array byHA5IW mounted up on the Tower
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Ken Konechy W6HHC 23
Antenna Modeling – “a lesson learned”
• While preparing a TechTalk on Panel Antenna, I corresponded with G8GML about gain
• In G8GML’s article in CQ-TV, he field tested the 6-loop design over mesh at 16 dBd gain
• My NEC-Win model showed 14 dBd ??
• G8GML kindly explained “ground reflection” at a test site can add to measured gain
• So in real world…“Your mileage may vary!”
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Ken Konechy W6HHC 24
Different Antenna Modeling SW• NEC2 – was designed by Lawrence Livermore Labs
• EZNEC - uses NEC2 “core” software with Windows GUI
- by Roy Lewallen, W7EL - www.eznec.com
• NEC-Win – uses NEC2 “core” SW with GUI
- by L. B. Cebik, W4RNL (SK) - NO LONGER SOLD
• MINI-NEC – simplified NEC2 to run on slow PCs
- fairly obsolete, inaccurate
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Ken Konechy W6HHC 25
Antenna Modelingsoftware
The End
Any Questions??