6.13. 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 1/4, and its length is much greater than the spacing. Determine the (a) 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).

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6.13. 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 ^/4, and its length is much
greater than the spacing. Determine the
(a) 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).
Transcribed Image Text:6.13. 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 ^/4, and its length is much greater than the spacing. Determine the (a) 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).
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