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A small circular parabolic reflector, often referred to as dish, is now being advertised as a TV antenna for direct broadcast. Assuming the diameter of the antenna is 0.6 meter, the frequency of operation is 12 GHz, and its aperture efficiency is 55%, determine the following: (a) Maximum effective area of the antenna (in m?). (b) Maximum directivity (dimensionless and in dB). a. 0.156 m? 350 dB b.0.283 m2 - 376 dB c. 1.131 m2 - 436 dB d. 0.283 m? - 39.5 dB e 0622 m2 41.0 dB

A small circular parabolic reflector, often referred to as dish, is now being advertised as a TV antenna for direct broadcast. Assuming the diameter of the antenna is 0.6 meter, the frequency of operation is 12 GHz, and its aperture efficiency is 55%, determine the following: (a) Maximum effective area of the antenna (in m?). (b) Maximum directivity (dimensionless and in dB). a. 0.156 m? 350 dB b.0.283 m2 - 376 dB c. 1.131 m2 - 436 dB d. 0.283 m? - 39.5 dB e 0622 m2 41.0 dB

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A small circular parabolic reflector, often referred to as dish, is now being advertised as a TV antenna for direct broadcast. Assuming the diameter of the antenna is 0.6 meter, the frequency of operation is 12 GHz, and its aperture efficiency is 55%, determine the following: (a) Maximum effective area of the antenna (in m?). (b) Maximum directivity (dimensionless and in dB). • a. 0.156 m?2 35.0 dB •b.0 283 m?- 37.6 dB •c. 1.131 m?. 436 dB • d. 0.283 m? - 39.5 dB • e 0622 m? 41.0 dB 8 Consider a four-element dipole array in the Figure. If the four dipoles are aligned with the z-axis and excited uniformly with identical magnitudes and the distance between the elements is d = A/4, choose the phase excitation coefficient (B) such that the array factor has a maximum at 0 = 60°. d • a. –n/2 •b. -T/6 •C. -T/4 • d 0 2 -7/3 13 9. Assuming a lossless half-wave dipole antenna exhibits a radiation resistance of 63 ohms at resonance (antenna reactance is zero), calculate the voltage standing wave ratio (VSWR) on a 50 ohms transmission line connected to the dipole antenna. a 224 b 1 c. 182 •d 1.26 •e 1.5 13
Transcribed Image Text:A small circular parabolic reflector, often referred to as dish, is now being advertised as a TV antenna for direct broadcast. Assuming the diameter of the antenna is 0.6 meter, the frequency of operation is 12 GHz, and its aperture efficiency is 55%, determine the following: (a) Maximum effective area of the antenna (in m?). (b) Maximum directivity (dimensionless and in dB). • a. 0.156 m?2 35.0 dB •b.0 283 m?- 37.6 dB •c. 1.131 m?. 436 dB • d. 0.283 m? - 39.5 dB • e 0622 m? 41.0 dB 8 Consider a four-element dipole array in the Figure. If the four dipoles are aligned with the z-axis and excited uniformly with identical magnitudes and the distance between the elements is d = A/4, choose the phase excitation coefficient (B) such that the array factor has a maximum at 0 = 60°. d • a. –n/2 •b. -T/6 •C. -T/4 • d 0 2 -7/3 13 9. Assuming a lossless half-wave dipole antenna exhibits a radiation resistance of 63 ohms at resonance (antenna reactance is zero), calculate the voltage standing wave ratio (VSWR) on a 50 ohms transmission line connected to the dipole antenna. a 224 b 1 c. 182 •d 1.26 •e 1.5 13
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