How do you calculate the number of turns in a helical antenna?

The value of length of helix, NS or Number of turns (N) can be selected based on the following requirements:

1. A=NS must be much smaller than wavelength, Lamda of helical antenna.
2. Directivity is directly proportional to the axial length NS.
3. Axial ratio (AR)= {1+(1/2N)}, Number of turns must be more to reduce axial ration.

Which antenna is for 2.4 Ghz?

Directional 2.4GHz Antennas Directional antennas: The most popular types for outdoor are Yagi, Parabolic Grid or Dish (Parabolic is best for long-range Point-to-Point), and Sectoral. Panel and Patch antennas are types of Sectoral antenna that are more cosmetically-attractive and so is well-suited for indoor.

Are helical antennas good?

Helical antenna are great for preventing multi-path as they are circularly polarized, suitable for both 2.4GHz and 5.8GHz. The Helical antenna can achieve high directionality by simply increasing the number of turns of coil. The more turns on a helical antenna, the higher gain it becomes.

Is helical antenna omnidirectional?

The antenna acts similarly to an electrically short dipole or monopole, equivalent to a 14 wave vertical and the radiation pattern, similar to these antennas is omnidirectional, with maximum radiation at right angles to the helix axis.

How long is a 2.4 GHz antenna?

The length of the antenna on a typical 2.4GHz receiver is 28.8 to 32 mm long, most are about 28.8 mm. The antenna is that length of bare line often at the end of a longer coaxial cable to move the antenna farther out from the receiver.

Are helical antennas directional?

The helix of the antenna can twist in two possible directions: right-handed or left-handed, the former having the same form as that of a common corkscrew.

When would you use a helical antenna?

Applications

1. A single helical antenna or its array is used to transmit and receive VHF signals.
2. Frequently used for satellite and space probe communications.
3. Used for telemetry links with ballastic missiles and satellites at Earth stations.
4. Used to establish communications between the moon and the Earth.