Helix Antenna

[Andrew77 6]

these are the best (to my opinion) AN for Helical antennas

 

HIGH GAIN AXIAL-MODE HELICAL ANTENNA WITH metallic disk.pdf

Low_Pitch angle Helix Antenna.pdf

Optimization of Helical Antennas.pdf

[Admin 2545]

,,,okay,about pitch angle...classical=12,5-14,5degree,minimum=4-7degree,but I think it's best=17,7degree

[Admin 2545]

,,,do you want something like that...???

Mavic Air Long Range Antenna Helical

3 cylindrical spirals and 3 hemispherical spirals ...? /

[Andrew77 6]

In reality, before doing that, I would like to know if this antenna has a 3dB HPBW around 100° or maybe something wider beamwidth than a traditional helix...

 

[Admin 2545]

,,,this is what you are talking about..???

[afm22000 0]

hi admin. is it possible to simulate in 4nec2 a 2.45ghz helix antenna inscribed on a pvc rain pipe? .. I read that I should use the frequency of 3620mhz, but also the relationship between turns is not altered? How do I adapt the impedance? Thanks a lot!!

[Admin 2545]

,,,hi buddy...!!!

,,, I think it's possible, I didn't really work with 4nec2, try it anyway .. !!!
,,, from here you can choose a calculator for the helix antenna....https://yandex.ru/search/?text=helix antenna calculator&clid=2270485&banerid=6302000000%3A5e8ad2bd534fbf00271b3d7b&win=383&from=ntp&lr=105372

[Sl4va 11]

On 04.10.2016 at 2:30 PM, Admin said:

 

An interesting design, but the question is how to connect them correctly? and is it possible to somehow connect "mimo"

[Admin 2545]

,,, this variant is also possible....

,,, but this idea (helix + parasitic patch directors), has no advantage...

[GeoElisk 0]

I am currently developing an hardware based on TD1205.
Is it possible to have more information on the design of the RF antenna deployed on the TD1205? What is the material used? The antenna impedance?

I am considering twisting it, would it be possible?

Could you provide on-demand design for this antenna?

Best,

JG

[Admin 2545]

TD1205 it"s a high-end module for a faster and easier geolocation,but for what frequency ... ???

[Fir3shoxk 0]

Hi!

I have multiple questions

1. What material must the back metal ground and the loaded metal disk be? Could I use a material such as Copper?

2. What material must the helical line radiator be made of?

3. How must the coaxial supply line be connected to the helical line?

4. In between my helical radiator, could I include any insulator such as a plastic 3d print or does the region in between the line radiator have to be made from another material?

[Admin 2545]

I have only one question,,, for which frequency ... ??

[Fir3shoxk 0]

For 2.4ghz

Sorry, I have a couple more questions now. I have copper sheet only, so would that work as the ground plane and metal disk above the helix. Also does the gauge of the wire matter for performance?

[Admin 2545]

I think the best is the galvanized sheet ... !!!

[Fir3shoxk 0]

Like galvanized aluminum for both the ground plane and the metal disk?

[Fir3shoxk 0]

Wait but why would that be the case? A ground plane is an electrically conductive surface, so isn’t copper one of the most conductive materials?

[Dr. Pepper 58]

You not only have to consider conductivity also price, stability and weather resistivity. For performance copper or even silver would be the best for all parts of the antenna, for price and mechanical stability zinc coated steel would be the best. This should also withstand weather for a relative long period. Would be interesting to cover the steel sheets with copper in a galvanic process.

Aluminium can also be used but is hard to solder on.

[Admin 2545]

"Lunokhod-3 "(original, flight copy)

,,, the antenna (helix + patch), with all its long length, does not show a very high gain in directivity...

[Rtyon 1]

On 26/11/2017 at 8:15 PM, Admin said:

 

I saw a model for the 2.4 GHz  helical Wi-Fi antenna contains 12  turns  and with a copper foil
  matching transformer  can I use  the same measurements of the antenna with 4 turns and an aluminum matching transformer

 

 

[Admin 2545]

,,,show me where you saw...!!!

[Biruza 3]

I'm trying to make an analysis of a spiral antenna for drones. There is data diameter 47 mm, pitch 5 mm reflector diameter 55 mm. Matching elements are not visible. They need to be invented. Three turns on the cylinder plus three turns on the sphere.
How to draw it in cst studio. In "Curves" select "Analytic Curve".
The first part - three turns on the cylinder: 

x=23*sin(2*pi*t)

y=23*cos(2*pi*t)

z=5*t

t from 0 to 3
The second part is three turns around the sphere:

x=23*sin(2*pi*t)*cos((t-3)*pi/6)

y=23*cos(2*pi*t)*cos((t-3)*pi/6)

z=5*t

t from 3 to 6

Let's convert the curve to a wire.

What are some ideas for reconciliation?

helix-helix.bmp

[Admin 2545]

You tried to make such an antenna...????

Mavic Air Long Range Antenna Helical

3 cylindrical spirals and 3 hemispherical spirals ...? /

 

,,,the power supply of the helix antenna is not in the center, it is on the perimeter of the helix>>>

,,,something like that...!!!

[Admin 2545]

,,, these would be the results of your antenna simulation...

[Biruza 3]

In your example, the match is good, but the gain clearly does not correspond to 16 dBi and the 2.4 GHz band does not work properly.

The shape of the antenna from your example is different. I compared the available projections of the spirals from DJI from photos and videos, these are really 3 + 3 turns, diameter 47 mm, pitch 6 mm.
It is easy to reproduce,  just thread the wire through the printed frame. But how to connect?

In the Antenna Magus program, there is a variant of the hemispherical antenna array. But there is no cylindrical part. And there is no dual frequency band. Power is supplied exactly near the center. For antennas for DJI drones, the output is approximately in the middle between the edge and the center. What can be inside there?

2_by_2_Hemispherical helical array.cst