Practical Antennas – 1 – 3

11. Which of the following improves antenna directivity ?

(a) Driven element
(b) Reflector element
(c) Director element
(d) Parasitic element

ANSWER

EXPLANATION

12. An antenna with unity gain.

(a) rhombic
(b) half-wave dipole
(c) isotropic
(d) whip

ANSWER

EXPLANATION

13. Discone radiation pattern is ……….. ?

(a) omnidirectional
(b) unidirectional
(c) bidirectional
(d) figure of eight

ANSWER

EXPLANATION

14. What is the theoretical gain of a Hertzian dipole ?

(a) 1.76 dB
(b) 2.15 dB
(c) 3 dB
(d) 0 dB

ANSWER

EXPLANATION

15. The current maximum in a Marconi antenna is found at :

(a) the base of the antenna
(b) the center of the antenna
(c) some point between the base and the center of the antenna
(d) the top of the antenna

ANSWER

EXPLANATION

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