Comparing DCA, QFH, Lindenblad and turnstile (eggbeater) antennas : http://www.qsl.net/py4zbz/4ant.htm
All but the QFH show significant (10 dB) nulls all over the place. I'm sorry, I cannot read the language, but does he say anything about these nulls and the height of the antenna over ground? And what kind of ground was used in the model? Perfect or real... or free-space
Since all of the antnnas are multi-element, those lobes could all simply come from the multi elements more or less independent of the ground reflection...
Bob, WB4aPR
the second plot and third plot with the patterns overlaid is for 7m above ground, doesn't specify what type of ground.
-Zach, KJ4QLP
On 3/16/2016 12:29 PM, Robert Bruninga wrote:
Comparing DCA, QFH, Lindenblad and turnstile (eggbeater) antennas : http://www.qsl.net/py4zbz/4ant.htm
All but the QFH show significant (10 dB) nulls all over the place. I'm sorry, I cannot read the language, but does he say anything about these nulls and the height of the antenna over ground? And what kind of ground was used in the model? Perfect or real... or free-space
Since all of the antnnas are multi-element, those lobes could all simply come from the multi elements more or less independent of the ground reflection...
Bob, WB4aPR _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
participants (2)
-
Robert Bruninga -
Zach Leffke