8.3-8 Design and plot the array factor for an ordinary endfire, five-element, uniformly excited linear array with spacings d 0.35λ. Use θ°-180° and find a. 8.3-8 Design and plot the array factor...
Q4: (0) Define array factor for an N element unifom linear array antenna with the help of a suitable igure and equations. Assume have progressive phase shift of B. How total antenna nattern is related to the array factor? (iü) Compute array factor in simplified form for 10 elements array placed along Z-axis where element to element spacing (d) is 0.72), progressive phase is 45°, frequency of operation is 24 GHz when the main beam is pointed at θ 60°....
8.2-4 Usually, the interelement spacing of an array is about one-half wavelength. Spacings much greater than this produce major lobes in undesired directions. To illustrate this point, use the techniques of Fig. 8-6 to sketch the array factor for a two-element array with equal amplitude, in-phase elements in polar form for the following spacings: (a) d31/4 and (b) d- 22. Examples 3-2 and 8-1 and this problem show the effects of spacing on an array of fixed excitation. 2π -Visible...
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
Name: Problem 2. (Option # 1 ) Five half wavelength dipole antennas are used as sources to form a linear phased array antenna, as shown below. These elements are all excited by sinusoidal current source of equal amplitude and phase followed by phase shifters. (9 pts.) a) If d 2, write the expression for array factor of the linear array. (9 pts.) b) Find total field at observation point P: (r, 0, 6) at far-field (i.e., kr>1). (8 pts.) c)...