N78 Antenna

[papagayor 19]

Have seen, trying but all these numbers look UFO to me

[Admin 2791]

Try this too ...

3.52-1ghz.cst

[papagayor 19]

You'll make me go on buying a new laptop as these calculations are very heavy. I own a Lenovo L490 with 8365U, running Debian and Virtualbox running Win10 which then run CST!!!

[papagayor 19]

Finished, how does it looks? Need more information?

[papagayor 19]

I'm not sure about tubes height, I'll try to lower tubes at a distance of 1/4λ as this is the proposed distance I have seen online samples

[Admin 2791]

Yes, that's about it...still needs work...!11

[Admin 2791]

,,,it's also possible...with cantenna...

 

 

[papagayor 19]

You mean to attach a yagi-disk as director into a cantenna  but using probes for signal as in cantenna? Or just put the whole construction in cantenna box for better performance? Cannot understand this plan.

[Admin 2791]

Yes, there are two versions of the cantena, a simple one and a combined one.

[papagayor 19]

Modified the antenna but I'm getting errors, by your free time have a look and correct it please

3300-3800-1 MHz BESTER.cst

[Admin 2791]

Here's the problem, you have to keep this in mind....!!!

[papagayor 19]

I think it is better

3300-3800-OPT.cst

[papagayor 19]

OLE, I think getting better by working on CST, that's my new design for a similar to Kathrein element, not so good but looks to work, also if mounted on a parabolic dish, maybe it give much more gain. Now trying to decrease the VSWR

KathreinPLAN.cst

[clanon 311]

when looking for Interference between solids , watch closely if you want to TRIM the first one (metal overlapping dielectric) or INSERT the Dielectric into the METAL that overlaps... TRIM or INSERT are the most useful commands before simulation...

[papagayor 19]

Thank you my friend, I'm new on CST design but trying to learn by seeking online for help, also continue to design different models and simulate them for knowledge. I liked the Kathrein antenna design that is simple and very stable and trying to make a prototype at 3.5GHz center frequency and a bandwidth of 3.3-3.8 because that is the working 5G area in Greece

[clanon 311]

9 minutes ago, papagayor said:

Thank you my friend, I'm new on CST design but trying to learn by seeking online for help, also continue to design different models and simulate them for knowledge. I liked the Kathrein antenna design that is simple and very stable and trying to make a prototype at 3.5GHz center frequency and a bandwidth of 3.3-3.8 because that is the working 5G area in Greece

...find one working HERE or anywhere and SCALE DOWN-UP to 3.5ghz that's the easiest way...(You'll NEED the CST or 3d model)

[papagayor 19]

Seeking for something similar but no luck, so decided to go on by trying different procedures on design according to this one:https://www.rfelement.com/products-72.html

[Alumni 1]

On 24/4/2025 at 6:21 AM, papagayor said:

Thank you very much sir, but please can't my drawings be modified to work in this area? Because they're easy to be made for my skills. Also a dual polarized batwing with two ports would interesting.

How do you feed this, Not easy to make. What do you think.

 

[clanon 311]

39 minutes ago, Alumni said:

How do you feed this, Not easy to make. What do you think.

 

What's the plan...mimo Circular polarization...V and H pol...?

[papagayor 19]

So, back again after Summer work. Going on constructions and need to know something about a Bester drawing Dual port antenna placement, I attach a plan and want to learn what is the correct placement for the antenna on a satellite disk:

Bester.pdf

[papagayor 19]

Please Ignore above post, it has been answered.

[papagayor 19]

Made one based on Admin's suggestion, from scarp metal that had, not attached yet on a parabolic disk, but seems to work good. Without antenna Ookla Speedtest was about 45-60Kbps, after over 80Mbps, testing from PC's ethernet connection, testing from mobile closed to router was over 100Mbps. Even it is made with bad stuff like thin simple wires and not good soldering as I didn't have some quality materials (I order some from Ali and waiting to go on for a new one), results are enough satisfying. But I don't understand why router shows "red" light and not "green" as it should if signal is good, suppose it is from speedtest,  any explanation please or any suggestions? Thank you.

[papagayor 19]

IMAGES

https://drive.google.com/drive/folders/1oHy7-YtNA768eqKI5IKLTqeyZlM0sgAL?usp=sharing

[clanon 311]

4 hours ago, papagayor said:

 But I don't understand why router shows "red" light and not "green" as it should if signal is good, suppose it is from speedtest,  any explanation please or any suggestions? Thank you.

5G not available or not registered...so it might be just on 4G...(which has a practical limit close to 100MBPS)