Radar

A method, system, or technique of using beamed, reflected, and timed radio waves for detecting, locating, or tracking objects.

The frequency bands used by radar (radar frequency bands) were first designated by letters for military secrecy. These are shown in the following table.

Frequency Band	Frequency Range x109Hz	Wavelength Range cm
P-band	0.225 to 0.39	140 to 76.9
L-band	0.39 to 1.55	76.9 to 19.3
S-band	1.55 to 5.20	19.3 to 5.77
X-band	5.20 to 10.90	5.77 to 2.75
K-band	10.90 to 36.00	2.75 to 0.834
Q-band	36.00 to 46.00	0.834 to 0.652
V-band	46.00 to 56.00	0.652 to 0.536