5Ghz Cantenna Calculator Plus Much More

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5Ghz Cantenna Calculator Plus Much More

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Cantennas are typically used to increase the range of (or discover) wi-fi networks.

However, a cantenna can be made from various cans or tubes of an appropriate diameter.

To fully understand the results obtained by this calculator, please take a few minutes to read the explanation below it.

Be prepared to trim the ends of the inverted V dipole if the final.

This formula to obtain the length of a half-wave dipole antenna will give a good ballpark value to start with.

However, the actual resulting frequency of resonance and feed-point impedance of a dipole will depend on.

The inverted V results in: A more omni-directional radiation pattern than that of a dipole.

A higher resonant frequency for the same length of wire as the dipole.

A lower feed point impedance than the horizontal dipole (for feed points at the same height above ground).

It is adjusted to take into account the special characteristics of the inverted V.

In the case of the inverted V we must add - to the list of environmental variables influencing the half-wave dipole - the angle between the two legs of the inverted V.

The angle below the two sections of a horizontal dipole is 180 degrees.

As the two sections of the dipole are lowered below the feed point, the angle between the two legs decreases: The resonant frequency of the inverted V rises.

The influence of the ground conductivity and dielectric constant becomes an increasing factor.

NOTE: if you start by giving the calculator your desired frequency of operation, the inverted V - when installed in its final position - may be still end up too short or too long, depending on the environmental conditions mentioned above.

If the antenna is too long (resonates below your desired frequency) then its not a problem: you just trim each leg a little at a time until you reach lowest SWR.

Note: To avoid cutting the wire, I usually just fold back each end of the antenna wire on itself and tape it tight if its insulated wire - or twist it back on itself if you are using bare wire.

But if the antenna is too short (resonates above your desired frequency) then its a little more trouble to add wire to each leg to bring down its frequency of resonance where you want it.

Therefore, the angle between the two legs of an inverted V should not be less than 90 degrees.

Remember, an inverted V requires slightly more wire than a horizontal dipole for a given frequency of resonance.

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