Q4: (0) Define array factor for an N element unifom linear array antenna with the help of a suita...
Design a 19-element uniform linear scanning array with a spacing of A/4 between the ele- ments. (a) What is the progressive phase excitation between the elements so that the maximum of the array factor is 30° from the line where the elements are placed? (b) What is the half-power beamwidth (in degrees) of the array factor of part a? (c) What is the value (in dB) of the maximum of the first minor lobe? Verify using the computer program Arrays...
6.48. Design a three-element, −40 dB side lobe level Dolph-Tschebyscheff array of isotropic elements placed symmetrically along the z-axis. Find the (a) amplitude excitation coefficients (b) array factor (c) angles where the nulls occur for d =3λ/4(0◦ ≤θ ≤180◦) (d) directivity for d =3λ/4 (e) half-power beamwidth for d =3λ/4