IONICA 19dbi 12 elements (3.5ghz though!)

[clanon 248]

https://www.youtube.com/watch?v=J2DBpXQ6_mA

 

best i could do...NOT to scale!!!

[Admin 2561]

This kind of antenna is very iterative, especially as it is meant to be broadband...

[clanon 248]

Downscaled  to 2.4ghz

Dimensions guessed...

1mm teflon sustrate

seems to work...need more refinements...to get higher efficciency and lower VSWR...and z closer to 50 ohms...(maybe...)

It should get closer or more than 20.5 dbi...(@ 3.5 ghz...)

 

Edited July 8, 2020 by clanon

[Admin 2561]

,,,for tuning the 50 Ohm impedance,Total Efficiency must to be <<  -0,06 dB...!!!

[clanon 248]

Not on DIELECTRIC...only on air ...i don't know about teflon...but for FR4 is 60 70 % efficiency...(-4.437 to -3.098)

 

[clanon 248]

Neltec about 90% attainable...(-0.9151db) apparently

[clanon 248]

@5 ghz...anyway...it should be lower losses at 2,4ghz (couldn't find it...)

Edited July 8, 2020 by clanon

[clanon 248]

this guy gives WORSE numbers...

[clanon 248]

"Unfortunately, the use of low-cost FR4 as the substrate introduces some additional complexity on the antenna design. This is due to the inaccuracy of the FR4 relative permittivity and its high loss tangent (around 0.02). Variations in the FR4 electrical permittivity can shift the operating frequency and the high loss tangent dramatically affects the antenna axial ratio and gain, resulting in poor radiation efficiency."

 

Design of Low-Cost Probe-Fed Microstrip Antennas | InTechOpen, Published on: 2011-04-04. Authors: D. C. Nascimento and J. C. da S. Lacava.

[clanon 248]

0.78 mm teflon (NELTEC)

2mm from ground plane to Feed points (Tracks are closer to reflector) Cavities are 5mm deep...or so...

 

[clanon 248]

Same concept...less gain (feed network not so efficient)

https://www.wifi-antennas.com/uploads/monthly_2020_10/alvarion_01.gif.e57fc5a0c9d6436d6dd17ce370ddcae2.gif

[Admin 2561]

,,, clanon, try to reduce the rotation speed in your images ... !!!