How is beam width calculated?

Antenna size and beamwidth are also related by the beam factor defined by: Beam Factor = (D/8)@(Beamwidth) where D = antenna dimension in wavelengths. The beam factor is approximately invariant with antenna size, but does vary with type of antenna aperture illumination or taper.

What is 3 dB beamwidth?

The 3 dB beamwidth of the antenna can be defined as the angular width of the radiation pattern, including beam peak maximum, between points 3 dB down from maximum beam level.

What is antenna beam width?

Beamwidth is the angle from which the majority of the antenna’s power, as illustrated on the radiation pattern’s main lobe, radiates. It may be measured in the horizontal or vertical planes and is the distance between two points where the power is less than half of the maximum.

How is antenna beam width measured?


  1. Let us first calculate the value of λ, Substitute the values in the λ formula, λ = 0.3 / frequency λ = 0.3 / 16 λ = 0.01875.
  2. Now, substitute the values in the beamwidth formula, Beamwidth. = ( 70 * 0.01875 ) / 2. = 1.3125 / 2 degrees. = 0.656 degrees.

How do you calculate half power beam width?

The Half Power Beamwidth (HPBW) is the angular separation in which the magnitude of the radiation pattern decrease by 50% (or -3 dB) from the peak of the main beam. From Figure 2, the pattern decreases to -3 dB at 77.7 and 102.3 degrees. Hence the HPBW is 102.3-77.7 = 24.6 degrees.

What is the half power beamwidth?

Half power beam width is the angle in which relative power is more than 50% of the peak power, in the effective radiated field of the antenna.

What is beam efficiency?

The beam efficiency of an antenna may be defined as the ratio of the power radiated within the main beam to the total power radiated. The beam efficiency is derived for ideal rectangular and circular apertures, as a function of the edge-to-center amplitude ratio.

What is the size of a beam?

THE STANDARD SIZE OF THE BEAMS In a residential building it is 9 ʺ × 12 ʺ or 225 mm × 300 mm standard size according to (IS codes). The minimum RCC beam size should not be less than 9 ʺ × 9 ʺ or 225mm × 225mm with the addition of a 125mm slab thickness.

What is antenna formula?

In another way, the antenna directivity can be defined as, the ratio of maximum radiation intensity of the test antenna to the average radiation intensity of the test antenna. Antenna Directivity D = maximum radiation intensity of a test antenna / average radiation intensity of test antenna. D = Ф (θ, Ф)max/ Фavg.

How is antenna gain calculated?

Gain is calculated by comparing the measured power transmitted or received by the antenna in a specific direction to the power transmitted or received by a hypothetical ideal antenna in the same situation.

Categories: Common