Collinear antenna array

[Admin 2859]

 

[Andrew77 15]

@admin 

Do you have cst or stl file of the cilindrical metal collinear antenna ?

Many thanks!

[Admin 2859]

,,,for which antenna...??

[Andrew77 15]

This one in picture

[Admin 2859]

,,,this must be it...!!!

[Priti 3]

@Admin can you share some detailed connections of this or a step file as I am unable to understand the connections of center conductors with cylindrical pipes. Thanks.

[Admin 2859]

I think it's understandable, this...

[Priti 3]

Thanks for the response. check the image

[Andrew77 15]

Only 6.3dBi for a 300mm of antenna 

[Admin 2859]

That's it, what are you going to do with it?

[Andrew77 15]

They are three dipole right? Gain is ok, but lenght could be less: first 93mm can be less!? Should not change gain

[Admin 2859]

I don't really believe it, but I'll do a simulation in this regard...how much distance(93 mm) do you want ...???!!!

[Andrew77 15]

Really I don't need, but I think balun can be some other thing like ferrite toroid on the feed cable after connector and 93.7 reduced to 60 

[Admin 2859]

60 mm not maybe>2*30,6+3=64,2 mm....!1!

[Admin 2859]

I think I was right....

[Andrew77 15]

I meant only the first 93.7 mm after the sma

[Jayakumaran S 7]

On 12/9/2020 at 3:46 PM, Admin said:

,,, and yet no, this omni antenna is not well sized...

,,, it is for 2.63 Ghz

and this is the reality after resizing...

I noticed the simulation includes a connector. Is it necessary to simulate with one?

Also, if the antenna ends with a copper rod, I have assigned the wave port by selecting the rod’s end face. Similarly, for a copper tube, I selected the tube’s face and assigned the wave port.

Kindly confirm if this method is correct.

[clanon 332]

3 hours ago, Jayakumaran S said:

I noticed the simulation includes a connector. Is it necessary to simulate with one?

Also, if the antenna ends with a copper rod, I have assigned the wave port by selecting the rod’s end face. Similarly, for a copper tube, I selected the tube’s face and assigned the wave port.

Kindly confirm if this method is correct.

Face select inner+pet+shield+outer edge , then assign wave port (ALL of them should be leveled)

puting a PORT on the END of an ANTENNA is a NO-NO

Edited July 9, 2025 by clanon

[Jayakumaran S 7]

12 hours ago, clanon said:

Face select inner+pet+shield+outer edge , then assign wave port (ALL of them should be leveled)

puting a PORT on the END of an ANTENNA is a NO-NO

Thank you so much for the clarification and guidance sir. Your explanation really helped me understand the correct way to assign the wave port.

I truly appreciate your support and time.

[Docgi 16]

Hi guys,

I found an article about S band Collinear antenna. I tried to simulate it and it worked well. I'm sharing the article if you would like to try. All the dimensions are there, except via between top layer and bottom layer of PCB. I just use 1mm diameter via at feeding point. You may see photos below. The results I have in HFSS are similar to the results in article.

The only difference I made is PCB type. They use Neltec NY9220 (IM), I used Arlon DiClad880, both look similar. Rogers5880 also can be used but Arlon DiClad880 is more cheaper than Rogers5880. 
 

I've got the max gain at 2.6GHz which is 8.3 dBi. It's also 7.8 dBi at 2.4GHz. With some tuning the max gain can be at 2.4GHz but it's already have good performance.

For outdoor applications anyone who wants can also add a radome to this design.

A Wideband Omnidirectional Printed Array Antenna.pdf

[clanon 332]

Never personally liked the dipole array on PCB...too much space and little gain...

But this is interesting due to the BANDWIDTH...(which is only 70-80 mhz needed for 2.4)

maybe an LTE adaptation could work...ALL METAL...