Antenna Frequency Length

Introduction to Antenna frequency length

Antenna in radio sense is a device for receiving or sending radio waves. Antenna can be defined as, it is a system of elevated conductors which couples (or) matches the transmitter (or) receiver to free space. Understanding What is a Rare Earth Magnet is always challenging for me but thanks to all math help websites to help me out.

The length of antenna is indicated in wavelengths i.e., in λ, if we want to calculate the length of antenna for a particular frequency f then we know the formulae
Frequency (f) = Velocity of light ( C )
Wavelength (λ)

Where f = frequency in Hertz
C = velocity of light = 3 x 103      meter/sec
Wavelength λ in meters

For example if you want to build a half wave dipole antenna then we take length of antenna as λ/2 for a particular frequency.

Calculating the Wavelengths
Now we are going to calculate wavelength ranges for all electromagnetic spectrum.

Audio frequency, it is abbreviated as AF which is in the frequency range of 20 to 2500 Hz. so from this we can calculate the wave lengths as 15,000,000 to 120,000 meters.
High Audio frequency, it is abbreviated as HAF which is in the frequency range of 2500 to 5000Hz. The wave length range is 120,000 to 60,000 meters.
Very Low Frequency, it is abbreviated as VLF which is in the frequency range of 10 to 30kHz and the wave lengths are in the range of 30,000 to 10,000 meters.
Low Frequency, it is abbreviated as LF and is in the frequency range of 30 to 300 kHz whose wave lengths range is 10,000 to 1,000 meters.
Medium Frequency, it is abbreviated as MF  and is  the frequency range of 300 to 3,000 kHz  and the wave lengths are in the range of 1,000 to 100 meters.
High Frequency, it is abbreviated as HF and is in the frequency range of 3,000 to 30,000 kHz and whose wave lengths are in the range of 100 to 10 meters.
Very High Frequency, it is abbreviated as VHF and is in the frequency range of 30 to 300 MHz and whose wave length ranges as 10 to 1 meters. Is this topic equation for pressure hard for you? Watch out for my coming posts.

As we observe all the frequency ranges it is known that wavelengths are inversely proportional to frequency. For low frequencies it is almost impossible to build a antenna. So we have modulation technique in order to decrease length of antenna at low frequencies.