beamwidth vs bandwidth

Hello all , Can someone tell me what the difference between beamwidth and bandwidth is?

Answer 1

[Walter Roberson]

There is a presentation here

Answer 2

[chris hinkle]

Bandwidth refers to the amount of the frequency spectrum that a signal resides in, example the spacing between channels on your radio are determined by their bandwidth.

Beamwidth is a physical characteristic of an antenna. They generally mark the point from bore sight of a directional antenna that you are at.-3dB or half power

Answer 3

[Shriya Namani]

The angular separation between the points at which the magnitude of the radiation pattern decreases by 50% (or -3dB) from the peak of the main beam is called as the Half-Power Beamwidth (HPBW).The angular span between the first nulls adjacent to the main lobe in the radiation pattern is called as the First Null Beam Width(FNBW).

You can calculate the beamwidth using the function beamwidth.

Bandwidth is the range of frequencies over which the antenna characteristics are within the acceptable value around the center frequency. For broadband antennas, the bandwidth is usually expressed as the ratio of the upper to lower frequencies of acceptable operation. For example, a 10:1 bandwidth indicates that the upper frequency is 10 times greater than the lower.

For narrowband antennas, the bandwidth is expressed as a percentage of the frequency difference (upper minus lower) over the center frequency of the bandwidth. For example, the upper and lower frequencies are 1010 MHz and 960 MHz respectively and the center frequency is 1000 MHz. The percentage bandwidth is ((1010 MHz- 960 MHz)/1000 MHz)*100 = 5%. This indicates that the frequency range of acceptable operation is 5% of the bandwidth center frequency.