AmateurRadist

can someone hint me where i can get CST for free ot at reasonable price?

Hi, I saw HFSS free student version, 2024r2 i assigned to learning course and learned some basics, when i wanted to check vswr - the student version doesn't support analyzing vswr, then tried to buy license but it's about 60k euros, how the hell this software cost this much i can't understand, now looking into CST

thanks, finally after some attempts it worked perfectly vswr <1.5, forgot to take photos

Hi! I had 2.4Ghz & 5-5.8GHz 14dbi panel antenna, I'm wondering if i want to have signle band antenna like only for 2.4Ghz and only 5.8GHz antenna - can i cut somewhere in middle and still have good vswr? Antenna made of galvanized steel, here is the drawings of it? I tried to cut right next to the soldering pin and assembled antenna but vswr was around 1.8-2.2 while factory vswr is 1.3-1.5 any help is appreciated thanks

@clanon thanks yes with that filter added vswr was good, is there a filter for 5.8 too? To make 5.8 at least workable

After 10 failed attempts I think deviding was not good idea, so friends just use antenna as it is, hope above information will be useful to someone thanks

Yes it become just ordinary service recently, can you give some advices how to change lines?

I have at top corners, small square, can you help with that and check on simulation software?

You mean lines connecting elements?

Which limes?

I tried like this but still fail

Vswr is good why you think it is not good? I cut right next to solder pin and it showed good results like peak 1.8 at 2.3-2.5ghz with a good cable, but 5.8 didn't work yet

okay i will get dimensions asap

Most interesting part is that original factory antenna's vswr showing sometimes good vswr, sometimes bad depending on analyzer-antenna cable jumper's position, like if i bend it's good, i'm using jdsu celladvisor

I tried both options vswr still high, i placed feed1 a bit higher, to upper square though, it was originally designed with N type connector but i replaced it with cable, should it effect? i will try check sizes and send

have you seen dxf it's correct dimensions

here is the dxf file https://disk.yandex.ru/d/HBfm2j3BfYz5qA spacers are made of plastic, bottom 4mm, top 8mm

Any thoughts about this antenna

Thanks, I'll try, but I need a little time to remember. By the way, here on the forum I found material on using CST, also useful material. Could you also try to improve this antenna, anyway your experience is invaluable?!

So this is not original russian antenna? That's why we need to further simulations ?

Yes, I once studied at the university on the subject of "antenna-feeder devices"

But it must be adjusted at 1800 MHz, if it's possible could you present CST file.

Greetings to radists In second attempt/episode of "that looks easy, let's do it instead of buying" reality show I finally got 2.5 vswr max in main port and surprisingly amazing 1.8 vswr in second port without cylinders. I suppose vswr in main port is high due to bad soldering, after bending it's like mission impossible to reach this pin. Before bending, soldering is easy but hard to bend. I will try once more, are there any other things I need to consider to get lower vswr in main port i may be not keep in mind. Any suggestions are welcomed Huge thanks to admin for his hints

How come? It's 1700-2200mhz, without cylinders will narrow to 1700-2600mhz? 2) these cylinders are not connected to main antenna in original version, why should I connect it to main part by metal spacer?

for what frequency range it will be narrow.