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clanon

3/4 FA20

Trying to get more gain on small and easy footprint size, with FA20 patches as reference.

3 4 fa20.JPG

34 FA20.JPG

Captura.JPG

Captura2.JPG

Edited by clanon
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When a transmission line is terminated with impedance, ZL that is not equal to the characteristic impedance of the transmission line, ZO, not all of the incident power is absorbed by the termination.  Some of the power is reflected back to the source so that phase addition and subtraction of the incident waves creates a voltage standing wave pattern on the transmission line. The ratio of the maximum to minimum voltage where the successive maxima and minima are spaced by 180˚ (λ/2) is known as the voltage standing wave ratio (VSWR).

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Yea...i've known what VSWR...from the ...ARRL BOOKs ...back in the 90's ... is...but i think the antenna is too capacitive...WHERE can i see the REACTIVE Z...? and find out 

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screenshot_405.jpg

screenshot_406.jpg

screenshot_407.jpg

,,, if you do not understand something, ask me ... !!!!

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using 3mm Polystyrene foam (1.2) , and a capacitive disc to neutralize the antenna being too INDUCTIVE...

quarter fa20_01.gif

Not bad for a 180 by 240 cms...

Captura.JPG

Edited by clanon

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Doing the fine tunning , now...

very happy with the results , stability and Gain...!

W7 showing 10 db more than linux on every Ap...(damn drivers for sure)

WP_20191118_003.jpg

WP_20191118_001.jpg

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,,,very good, good luck ...!!!

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planning on REBUILD muy FA20 WITHOUT screws to reflector...this patches work better (lower VSWR) floating and NOT grounded!

"Years later I had the chance to buy an Agilent Fieldfox Network/Spectrum Analyzer for my job, I quickly measured the VSWR and the result is stunning 1.2 VSRW from channel 1 to 11, it kind of confirm the simulation results

https://vswr1.wordpress.com/2011/12/03/fooling-around-with-design-of-the-antenna-fa20/

Edited by clanon

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Changed Gain for stability

quarter fa20 17 wing perfect_01.gif

S11.JPG

vswr.JPG

Z.JPG

zi zr.JPG

hg.jpg

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,,,hi buddy...!!!

,,, good achievement ... !!!

In your cst simulation,  the polystyrene spacer is missing...??

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HI , JOMY...its hidden...4mm Pes ,(1.2 )

I'm using it right now...stable and "discrete";)

 

 

Captura.JPG

Captura2.JPG

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