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First, I've to say I'm a beginner in this field so please forgive me if my questions were not smart.

I was reading about Vivaldi antenna and I decided to do an experiment; I'm going to use a flat sheet of copper tape, a piece of FR4, and a coaxel cable.

I have the following two questions:

  • What is the impact of changing the size of the antenna?
  • What specifies the maximum input power namely in this experiment?
  • Is there a software that I can use to model & simulate the antenna accurately?
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  • \$\begingroup\$ Question: at what frequencies are you planning to use this? How much RF power do you have available? \$\endgroup\$
    – tomnexus
    Mar 29, 2015 at 6:20
  • \$\begingroup\$ Frequency: 2.4-5GHz. Max power available 3000W. \$\endgroup\$
    – Fabio
    Mar 29, 2015 at 13:28
  • \$\begingroup\$ I don't think there is any cable that can carry that much power continuously, you'll need a waveguide. Perhaps it could be done for a pulse, for radar etc. What is the source of the power? \$\endgroup\$
    – tomnexus
    Mar 29, 2015 at 15:40
  • \$\begingroup\$ I plan to test it in a rural farm to extend wifi range. The power will be drawn from a standard outlet. \$\endgroup\$
    – Fabio
    Mar 29, 2015 at 16:32
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    \$\begingroup\$ Fabio you need to do a lot more reading. Wifi is 0.1 or 0.2 W, perhaps 1 or 2 W with a booster (not legal in most countries). 3000 W is a quarter of a million dollar problem, not something you will use for farm wifi. The Vivaldi isn't suitable - it is broad band but quite low gain; Google for the Cantenna for an easy-to-build wifi antenna to extend your range. \$\endgroup\$
    – tomnexus
    Mar 29, 2015 at 20:48

1 Answer 1

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The size of the Vivaldi will determine the lowest frequency that it works at.

The input power will probably be limited by the coaxial cable. With a high power cable on a small antenna, you might find that the PCB overheats in the feed region.

There is modelling software but it's not cheap ($10,000 - $100,000), and not easy to learn. Try a demo of FEKO, it converts to a free Lite version which is limited but could just about model a basic planar Vivaldi.

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  • \$\begingroup\$ What factors contribute to the overheat of the cable & PCB? \$\endgroup\$
    – Fabio
    Mar 29, 2015 at 13:29
  • \$\begingroup\$ I mean when I buy a cable & a PCB, what specifications should I look at to estimate the overheat issue? \$\endgroup\$
    – Fabio
    Mar 29, 2015 at 13:38

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