C Band LNB rectangular horn design

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radiogareth
Posts: 761
Joined: Wed Jan 06, 2016 9:46 am

C Band LNB rectangular horn design

Post by radiogareth » Wed Jun 16, 2021 3:44 pm

I picked up a BNIB Norsat Gold (DRO) LNB originally intended for cruise ship duties. I want to use it for my local repeater GB3JV but it could do with a little bit of gain to assist. I've seen 3-D printed horns and read the drawbacks of the surface imperfections (less relevant and easier to resolve at 3.4GHz than at 22) so thought I'd have a go at designing/printing something.
Its a rectangular cavity 29.4 x 58.5 mm with a gasket in the surrounding flange. I'll need to seal it against weather and was thinking some thin (1.6mm) PTFE sheet (I have an abundance of the stuff) or acrylic.
I'll line the printed horn with self adhesive aluminium tape, but I need some dimensional guidance please. Could I scale from a similar X band horn and expect results? Or I could fab it from DS GRP PCB, solder joints on the outside.
Not found any particular design software (read=free) to assist, unlike almost any other type of antenna....
Guidance welcome...
Thanks
Gareth

G7JTT
Posts: 277
Joined: Fri Jun 10, 2016 5:05 pm

Re: C Band LNB rectangular horn design

Post by G7JTT » Wed Jun 16, 2021 7:38 pm


radiogareth
Posts: 761
Joined: Wed Jan 06, 2016 9:46 am

Re: C Band LNB rectangular horn design

Post by radiogareth » Fri Jun 18, 2021 10:59 am

Thanks John, that will do once I get my 3-D head around it.....
Gareth

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