Calculate the fraction of the power of a fundamental Gaussian beam that passes through an aperture with a radius that is equal to 2Wo.
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- design an ordinary end fire uniform linear array with only one maximum so that its directivity is 20 dB (above isotropic). The spacing between the elements is lambda/4 and its lenth is much greather than the spacing. Determine the (a) the number of elements (b) overall length of the array (in wavelengths) (c) approximate half-power beamwidth(in degrees) (d)amplitude level (compared to the maximum of the major lobe) of the first minor lobe (in dB) (e) progressive phase shift between the elements (in degrees)A laser pointer emits a cylindrical beam of light in the air of wavelength 633 nm , power 30 milliwatts and beam diameter 2mm . Ignoringng spreading of the beam , the peak amplitude E0 of the electric field , ( in volts/metre) is : give answer to a decimal