Understanding an RF Signal

What is RF Signal ?
A Radio Frequency signal is an electromagnetic wave that carries information over the air from one point to another.
RF signals starts as an electrical Alternating Current (AC), generated by a transmitter. This AC signal travels through the copper conductor and radiates out of an antenna in the form of electromagnetic wave.

What we see in the below diagram, is how a room would look if we were to have lot of devices emitting RF signals. These are waveforms commonly known as Sine Wave.

Just take a small portion of these RF signals and bifurcate it into 4 major variables,

a) Frequency
b) Wavelength
c) Amplitude
d) Phase

RF Spectrum ranges from 3 KHz to 300 GHz.

#	BAND	FREQUENCY	WAVELENGTH
1	VLF – Very Low Frequency	3 KHz – 30 KHz	100 km – 10 km
2	LF – Low Frequency	30 KHz – 300 KHz	10 km – 1 km
3	MF – Medium Frequency	300 KHz – 3 MHz	1 km – 100 m
4	HF – High Frequency	3 MHz – 30 MHz	100 m – 10 m
5	VHF – Very High Frequency	30 MHz – 300 MHz	10 m – 1 m
6	UHF – Ultra High Frequency	300 MHz – 3 GHz	1 m – 100 mm
7	SHF – Super High Frequency	3 GHz – 30 GHz	100 mm – 10 mm
8	EHF – Extremely High Frequency	30 GHz – 300 GHz	10 mm – 1 mm

Below diagram would clearly show us how the wave pattern looks with respect to the distance it travels over the air.

References:
CWNA Official Study Guide
https://www.nasa.gov/
https://yatebts.com/

Just take a small portion of these RF signals and bifurcate it into 4 major variables,

a) Frequency
b) Wavelength
c) Amplitude
d) Phase

RF Spectrum ranges from 3 KHz to 300 GHz.

#	BAND	FREQUENCY	WAVELENGTH
1	VLF – Very Low Frequency	3 KHz – 30 KHz	100 km – 10 km
2	LF – Low Frequency	30 KHz – 300 KHz	10 km – 1 km
3	MF – Medium Frequency	300 KHz – 3 MHz	1 km – 100 m
4	HF – High Frequency	3 MHz – 30 MHz	100 m – 10 m
5	VHF – Very High Frequency	30 MHz – 300 MHz	10 m – 1 m
6	UHF – Ultra High Frequency	300 MHz – 3 GHz	1 m – 100 mm
7	SHF – Super High Frequency	3 GHz – 30 GHz	100 mm – 10 mm
8	EHF – Extremely High Frequency	30 GHz – 300 GHz	10 mm – 1 mm

Below diagram would clearly show us how the wave pattern looks with respect to the distance it travels over the air.

References:
CWNA Official Study Guide
https://www.nasa.gov/
https://yatebts.com/

Just take a small portion of these RF signals and bifurcate it into 4 major variables,

a) Frequency
b) Wavelength
c) Amplitude
d) Phase

RF Spectrum ranges from 3 KHz to 300 GHz.

#	BAND	FREQUENCY	WAVELENGTH
1	VLF – Very Low Frequency	3 KHz – 30 KHz	100 km – 10 km
2	LF – Low Frequency	30 KHz – 300 KHz	10 km – 1 km
3	MF – Medium Frequency	300 KHz – 3 MHz	1 km – 100 m
4	HF – High Frequency	3 MHz – 30 MHz	100 m – 10 m
5	VHF – Very High Frequency	30 MHz – 300 MHz	10 m – 1 m
6	UHF – Ultra High Frequency	300 MHz – 3 GHz	1 m – 100 mm
7	SHF – Super High Frequency	3 GHz – 30 GHz	100 mm – 10 mm
8	EHF – Extremely High Frequency	30 GHz – 300 GHz	10 mm – 1 mm