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Sl4va

No name antenna 27+ dbi

I watched the video on YouTube, test different antennas. The guys showed a new parabolic antenna feed. A very interesting design! And easily repeatable at home.

I understand it is based on Log-periodic antennas?

изображение_viber_2020-08-09_14-46-42.jpg

Screenshot_9.png

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Posted (edited)

Link...?

 

27DBi... O.o...only on 5.8ghz...hard to get that on 2.4...need more than 1 m2 area...

Edited by clanon

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16 minutes ago, clanon said:

Link...?

 

27DBi... O.o...only on 5.8ghz...hard to get that on 2.4...need more than 1 m2 area...

it is broadband. from 800 to 2600 ghz

 

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Posted (edited)

I like it...

the fine mesh wire makes it work as a sheet metal reflector...but WIND LOADs are bigger...

we need to get the dimensions for the LogPeriodic feed...

 

Edited by clanon

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,,, this is not a nameless antenna ,,, it is called Kroks KNA 27 1700-2700 MHz

,,, attention to the title ... !!!

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16 minutes ago, Admin said:

,,, this is not a nameless antenna ,,, it is called Kroks KNA 27 1700-2700 MHz

 

no! irradiator Kroks KNA 27 looks different (look in google)

I watched this video, it says that this irradiator is not even available yet!

 napravlennaja-parabolicheskaja-3g-wifi-4

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,,, and then what are the dimensions of the parabolic reflector ... ??

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Posted (edited)

13 minutes ago, Admin said:

,,, and then what are the dimensions of the parabolic reflector ... ??

parabolic reflector from Kroks KNA 27

P.S. As it goes on sale, you need to buy, take measurements, and make a drawing

Edited by Sl4va

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,,, no, one of this ...

630x600x100mm

810x780x100mm

910x880x160mm

...it must to be...!!!

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I meant the antenna feed itself

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3 minutes ago, jnkwqlqn said:

LPDA feed, laser cut.

Of course....!!

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But you have to watch the impedance! Is there anyway to calculate impedance for LPDA boom distance in CST, etc?

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To continue on the LPDAs, there are a number of interesting PCB antennas by Kent Britain WASVJB: https://www.wa5vjb.com/products1.html

I tried to simulate that one at 850-6500 MHz band range with CocoaNEC (no Windows here, sorry) using the method described at https://hamwaves.com/lpda/en/index.html, and eventually reached similar parameters, but my antenna is definitely larger. For 850 MHz the λ/2=17.64 cm, so I'm surprised how WASVJB was able to fit it into the 13.4 cm PCB.

For the simulation I've set tau = 0.85, sigma = 0.12. Element to element transmission line impedance is 75 Ohm. All elements are of constant width 0.16 mm.

Exact location of the elements is as follows (all dimensions in meters):

Spoiler

 WIRE      OFFSET     LENGTH
    1      0.0000     0.0882  <- quarter wave of 850 MHz, must have two of those
    2      0.0423     0.0749
    3      0.0783     0.0637
    4      0.1089     0.0541
    5      0.1349     0.0460
    6      0.1570     0.0391
    7      0.1757     0.0333
    8      0.1917     0.0283
    9      0.2053     0.0240
   10      0.2168     0.0204
   11      0.2266     0.0174
   12      0.2349     0.0148
   13      0.2420     0.0125
   14      0.2480     0.0107
   15      0.2532     0.0091

 

Simulation data:

Spoiler

EkzbPy8WAAMv7Yc?format=pngEkzbDn2WAAc330v?format=pngEkzcw2kXUAAdGGT?format=pngEkzc6y_XUAExxv_?format=png

 

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What dielectric...? 

thickness , dielectric constant...

(there's ALWAYS losses , you know):|

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18 hours ago, clanon said:

What dielectric...? 

thickness , dielectric constant...

(there's ALWAYS losses , you know):|

The antenna is in free space.

All elements are of constant diameter 0.16 mm or slightly above 6 mils.

 

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