modeling and testing circular patch feed disk Yagi antennas.
Alex P
Continuing
on the topic of Antennas, here are
results obtained from modeling and testing
circular patch feed disk Yagi antennas.
Over the past 4 months, I have modeled, built and tested a number of configurations.
They perform quite well for their size, and exhibit high back and lobe suppression .
The one
shown here is the largest with a 1.5m boom and 23 directors
Performance Parameters :
FWHM beam width 23 degrees ( field_test matches model )
Gain 16.4 dBi
T_ant 290K_Earth - 10K_Sky = 6.2 dB
The spacing
of first 3 elements, Reflector, Feed, and First_Director ( besides patch feed diameter )
determines the Fn, and every element has an influence on the input impedance. An
adjustment of less than a cm spacing of even the far director ( or any) element will affect the Z match. ( as of course will the location of the feed point on the patch )
The entire structure acts as a tuned dynamic system .
These are based on the work by Dr Vidmar
https://lea.hamradio.si/~s53mv/cigar/design.html
Alex
b alex pettit jr
Lester Veenstra
Hard to read differing scales: What was 3 or 6 dB beamwidth in both cases?
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
452 Stable Ln
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
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b alex pettit jr
Lester Veenstra
Excellemt
Thanks
Les (CU at GB)
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
452 Stable Ln
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
From: 'b alex pettit jr' via Society of Amateur Radio Astronomers [mailto:sara...@googlegroups.com]
Sent: Sunday, April 21, 2024 10:21 AM
To: 'Lester Veenstra' via Society of Amateur Radio Astronomers
Subject: Re: [SARA] modeling and testing circular patch feed disk Yagi antennas.
They were both ~ 23-24 degrees
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