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Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+

Posted: Wed Sep 05, 2018 8:43 am
by phil
Has anyone out there played with one of these? https://www.tindie.com/products/hagster ... z-to-6ghz/

I was wondering if it could be use with a dish for C band?

Re: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+

Posted: Wed Sep 12, 2018 8:18 pm
by HighSNR
Hi Phil, this is my antenna. It should work as a feed for a c band dish.

To get optimum results you would need the beamwidth of the antenna to be matched to the diameter of the dish. Otherwise you risk loosing some gain with if the feed antenna spills over the sides of the dish.

You might also consider if the signal you are receiving is linear of circularly polorised. If the latter you might get better results with a helical antenna. You would need to remember the circular poloriaastion flips from left to right when it bounces of a dish. Hence for a RHCP antenna you would need an LHCP helix. There are lots of examples of this antenna type for 5.8GHz FPV. It shouldnt be too hard to scale one to work at C band.

Re: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+

Posted: Thu Sep 13, 2018 2:10 am
by phil
Fantastic, thanks for the reply. I will be ordering one in the coming weeks.

Re: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+

Posted: Sat Sep 29, 2018 9:27 pm
by HighSNR
Shhh. I have a new antenna in the works.

https://hexandflex.com/2018/09/29/spira ... na-part-1/

Re: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+

Posted: Sun Sep 30, 2018 7:40 am
by phil
Duuuuude! I have seen the spiral in the past (but not for my purposes), this looks good. I will hold off and see what happens :D You are doing some awesome work!

Re: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+

Posted: Sun Sep 30, 2018 8:45 am
by HighSNR
Hi Phil,

Good to hear that its interesting to people other than me.

So you are aware of the likely timescales. I'm still awaiting the first prototype back from the fab. If it passes my initial testing I then need to send it over to the measurement lab for some proper testing.

There is a risk that it wont work as predicted and I will have to go back and change the design.

I would guess that its 6 weeks away at the earliest at the moment.

Re: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+

Posted: Sun Sep 30, 2018 11:28 pm
by phil
I'm in no hurry, i understand the need to design these things correctly. In the mean time, i will still pick up a vivaldi to play with.

Re: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+

Posted: Wed Oct 03, 2018 5:34 am
by phil
Ordered your vivaldi this arvo as an early birthday present, looking forward to having a play with it, thanks. :D

Re: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+

Posted: Wed Oct 03, 2018 4:36 pm
by HighSNR
Hi Phil,

Got your order. As it's your birthday, I have packed 2 for the price of one. :ugeek:

Re: Ultra-WideBand Vivaldi Antenna 800MHz to 6GHz+

Posted: Wed Oct 03, 2018 11:58 pm
by phil
I did not expect that! I'm speechless! Thank you very much, what a kind thing to do.