Modifying a 2 4 GHz Dipole Antenna to 5 GHz

In this video I convert a 2.4 GHz dipole antenna into a 5 GHz antenna. I needed quite a few 5 GHz antennas for a project I am working on and it was much cheaper to modify 2.4 GHz antennas.

5 GHz and 5.8GHz dipole antenna:

2.4 GHz dipole antenna:

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    4 Discussions


    5 years ago

    Firstly love your tuts, But could you explain why shortening the antenna changes it and how to know by how much to shorten it by? I am going to do this hack but I'd like to know the science behind it if it's at all possible to do a vid about the workings of the antenna and why you had to shorten the sleeve.
    Keep up the good work. Cheers

    1 reply

    Reply 4 years ago on Introduction

    You'll have to read up on antenna theory. Something to do with the wavelength in a certain unit like meters and the length of the antenna being a fraction of the wavelength... like a wavelength, 5/8, 1/2, 1/4 wavelength.

    There is an old device to measure wavelength of an emitter/transmitter that was called a lecher wire.

    This device helped me visualize why. There is also something called a Standing Wave Ratio (SWR) Meter.

    This goes further to help match up the impedence of the antenna to the receiver/transmitter. The ratio of 1:1 is desired so there are not losses to heat and you have maximum efficiency.


    5 years ago

    Also I'm wanting to use a patch cable with a fishbone yagi 16dbi on a galaxy s2, the aim to pickup 4G network that's signal is 1.5 kms away. Possible or should I use a different antenna? If possible at all. TIA