How do you calculate the gain of a dipole antenna?
For example, an antenna made of 0.5-inch diameter tube for use on 144 MHz band will have a length to diameter ratio of RL/d = 39/0.5=78 which gives k = 0.961 or almost 4% shorter than the half-length.
How do you calculate folded dipole?
The antenna impedance for a half-wavelength folded dipole antenna can be found from the above equation for ZA; the result is ZA=4*Zd. At resonance, the impedance of a half-wave dipole antenna is approximately 70 Ohms, so that the input impedance for a half-wave folded dipole antenna is roughly 280 Ohms.
What is the frequency of a folded dipole antenna?
It looks like the length L of each folded dipole is somewhere between 0.5-1 meter, so that the total loop length is about 1-2 meters. Hence, we can estimate that these antennas are designed to operate at a wavelength of about 1-2 meters, and therefore radiate at a frequency of c/lambda= (3e8/2)=150 MHz to c/lambda= (3e8/1)=300 MHz.
How does the dipole calculator work?
Our dipole calculator is a simple tool that allows you to compute the length of a simple antenna – it’ll also provide you with the value of the wavelength and the adjustment factor [k].
What is the impedance of the dipole antenna?
Folded Dipole Calculator Frequency [MHz] Length units mm inch Length A Length Gap Length B Radius R Length C Rod Diameter Length D Total Length The impedance of this antenna is around 300 Ω, so you may want to use a transformer or a λ/4 long piece of 120 Ω coaxial cable to match this impedance to 50 Ω.
Can I use a Yagi Uda antenna with a folded dipole antenna?
Online Calculator .:. Folded Dipole Calculator To be combined with a Yagi Uda Antenna or used as is. The impedance of this antenna is around 300 Ω, so you may want to use a transformer or a λ/4 long piece of 120 Ω coaxial cable to match this impedance to 50 Ω. Geometriy is not that critical.