Write short notes on principle of pattern multiplication.
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1. The principle of pattern multiplication states that “the radiation pattern of an array is the product of the pattern of the individual antenna with the array pattern of isotropic point sources each located at the phase centre of the individual source.”
2. The array pattern is a function of the location of the antennas in the array and their relative complex excitation amplitudes.
3. The phase centre of the array is the reference point for total phase pattern.
4. Advantage: It helps to sketch the radiation pattern of array antennas rapidly from the simple product of element pattern and array pattern.
5. Disadvantage: This principle is only applicable for arrays containing identical elements.
6. The principle of pattern multiplication is true for any number of similar sources.
7. Total phase pattern is the addition of the phase pattern of the individual sources and that of the array of isotropic point sources.
The resultant pattern of an array of non-isotropic identical radiators is given by
E = [f (θ, ϕ) × F (θ, ϕ)] × [fP (θ, ϕ) + FP (θ, ϕ)]
where,
f (θ, ϕ) = element field pattern
fP (θ, ϕ) = element phase pattern
F (θ, ϕ) = array factor of isotropic elements
FP (θ, ϕ) = phase pattern of the array of isotropic elements.
The angles θ and ϕ respectively represent the polar and azimuth angles.
hopes it clarifies u...
2. The array pattern is a function of the location of the antennas in the array and their relative complex excitation amplitudes.
3. The phase centre of the array is the reference point for total phase pattern.
4. Advantage: It helps to sketch the radiation pattern of array antennas rapidly from the simple product of element pattern and array pattern.
5. Disadvantage: This principle is only applicable for arrays containing identical elements.
6. The principle of pattern multiplication is true for any number of similar sources.
7. Total phase pattern is the addition of the phase pattern of the individual sources and that of the array of isotropic point sources.
The resultant pattern of an array of non-isotropic identical radiators is given by
E = [f (θ, ϕ) × F (θ, ϕ)] × [fP (θ, ϕ) + FP (θ, ϕ)]
where,
f (θ, ϕ) = element field pattern
fP (θ, ϕ) = element phase pattern
F (θ, ϕ) = array factor of isotropic elements
FP (θ, ϕ) = phase pattern of the array of isotropic elements.
The angles θ and ϕ respectively represent the polar and azimuth angles.
hopes it clarifies u...
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Answer:
The principle of pattern multiplication states that “the radiation pattern of an array is the product of the pattern of the individual antenna with the array pattern of isotropic point sources each located at the phase centre of the individual source.
Explanation:
The pattern multiplication principle states that the radiation patterns of an array of N identical antennas is equal to the product of the element pattern Fe() (pattern of one of the antennas) and the array pattern Fa(), where Fa() is the pattern obtained upon replacing all of the actual antennas with isotropic sources.
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