How is dipole antenna calculated?
When determining how long to make each leg of a Dipole antenna, dividing the frequency in MHz into 468 will give the overall length. To find the half wave, divide that number by two. This will give you the length of each leg of the antenna.
How tall would a dipole antenna need to be?
Recommendation. For best results, dipoles should be at least 1/2 wavelength above ground level. For the lower bands, especially 160-40 meters, this can become impractical–place your dipole as high as your situation allows.
What is the range of dipole antenna?
The principles of the VHF antenna are extended into the UHF range to cover mobile communications applications. A calculable dipole antenna has been developed which is used to provide traceability for antenna factor over the frequency range 20 MHz to 2.2 GHz, to uncertainties as low as ± 0.15 dB.
How long is a 80 meter dipole antenna?
Each dipole leg is 34.4 feet long. Note that the SWR on 80 meters changes very little compared to Fig 2. No change was made to the 80-meter dipole or the transmission line. Fig 6 – Measured SWR for the 80- and 40-meter multiband antenna system.
What is the formula for antenna length?
The Half-Wave Dipole Antenna The most widely used formula to calculate the approximate overall length of wire required for a dipole is: 468 / frequency (MHz) = length of wire in feet.
What is the length of a dipole at 2.4 GHz?
We found that the length of the dipole antenna for the 2.4 GHz frequency is 0.35 λ, and the balun length is 0.25λ for the bazooka and 0.2 λ for the 1: 1 balun.
How do you determine dipole size?
Often a formula for the length of a dipole in feet is seen as 468 / frequency. This can be derived by taking the figure of 492 seen in the formula above and multiplying it by the typical A or end effect factor of 0.95.
What length should a 2.4 GHz antenna be?
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.
Is a balun needed for a dipole antenna?
The use of a balun will prevent the coax radiating any power or picking up any noise. In many practical situations it is possible to operate the dipole satisfactorily without one, but there may be a slight increased risk of interference if one is not used. Simple baluns can be bought from antenna suppliers, or made.
Is a full wave dipole better than a half wave?
It’s length (half of the wavelength) gives you the better performance than other lengths….. It may be gain, efficiency, directivity, return loss, etc….. I got the following picture from a book. I think the gain of the half wave dipole is higher than the full wave length antenna.