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clanon

21dbi (or more) 4 by 4 Patch Array

Been beating around the bush for years to find a Good 4x4 patch array...

Higher than 21 dbi , good impedance through the whole band,low enough vswr, under -20dbi side lobes...

the original design is for 12,5 ghz and almost none side-lobes Power distribution Ratio 1:5:5:1

Changed it to WiFi ,  distribution ratio 1:1:1:1 (Original design Eliminated Sidelobes at the COST of 1,5-2dbi of gain)

I'm happy (some testing still needed )

REAL dielectric constant of Polystyrene foam is a guess (1.02-1.05)

 

 

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vswr.PNG

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Brass 0.2 mm (patches and Central Feed) , Copper Tape (0.0254 mm) feed branches

20231020_184520.jpg

20231027_150917.jpg

20231102_171753.jpg

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Efficiency of Polystyrene foam ...is unbeatable...

More losses on metal than dielectric...

 

eff.PNG

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Feed network is at 2 mm from Aluminum Reflector , Patches are at 4 mm from Reflector...

There's a "tendency" these days to believe that Laser cutting-3D printing  and AESTHETICS are a key factor...FALLACY

Energy doesn't care about aesthetics it only Flows were possible , mm or single degrees error don' make much of a difference

BUT dielectric Constant MUST BE KNOWN...to get to the ballpark.

Edited by clanon

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,,, some dimensions, is it possible...??

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i have A model (my ssd failed with the original but i had the dimensions on paper) could put the dxf of the feed and patches are ALL the same

42 by 44 cm reflector

Model should be customized to Dielectric used in each case

 

branches.dxf

Centerfeedline.dxf

patches.dxf

Captura.PNG

Edited by clanon

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Styrofoam (lowest density better)

cut with resistance wire (nichrome) at 2 mm flat

 

DENSIDADES.jpg

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,,,but if galvanized sheet and wire supply lines are used....???

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it would be interesting...could be Laser cut or stamped...Wires have more REACTIVITY (Imaginary Z) Inductive reactance...impedance curve is always smaller...2mm copper ...maybe...

Copper tape is easy to cut with cutter under print drawing taped on top...perfect

you get more losses in the metal distances should stay the same and sizes...

to keep a good Impedance and low 2 mm or LESS from reflector the Feed network

Patches 4 mm or more from reflector (there is a step of 2 mm)

Captura.PNG

Edited by clanon
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yup...5.84 cm by 5.4 cm...(these are HIGHLY related to the Dielectric Factor , change from 0,4 to 0,5 would change several millimeters these dimensions)

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On 3/11/2023 at 3:40 PM, Admin said:

,,,but if galvanized sheet and wire supply lines are used....???

I would give it a go ...BUT with circular patches...we'll see...(you had one like that YEARS ago... mimo...remember...

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On 3/11/2023 at 2:06 PM, clanon said:

Styrofoam (lowest density better)

cut with resistance wire (nichrome) at 2 mm flat

 

DENSIDADES.jpg

Hi Guys, What is the loss tangent of this material?

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one of the LOWEST in the world 0.0003  at 3000 mhz  , only one better Polypropylene...at higher frequencies...5.8 ghz ideal...

 

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Edited by clanon

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Very interesting, Thanks for sharing! I was working with Rohacell

Since it has very low relative permittivity and low tangent loss too.

Captura de pantalla 2023-11-24 115734.png

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Water absorption should be adressed in PES foam...Changes ALL.

PVC pipe has THIS weirdness...

PVC.PNG

Edited by clanon

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