6. The free space attenuation between two microwave antennas 40 km apart operating at 8 GHz is :
(a) 146.7 dB
(b) 142.55 dB
(c) 82.5 dB
(d) 86.7 dB
7. If the correction factor k equals 4/3 of the earth’s curvature, the microwave beam would have a curvature that is …………… than that of the earth.
(a) more
(b) less
(c) equal
(d) not related
8. Microwaves link repeaters are typically 50 km apart :
(a) Because of atmospheric attenuation
(b) Because of earth’s curvature
(c) Because of output tube power limitations
(d) None of these
9. When microwave, signals follow the curvature of the earth, this is known as :
(a) The Faraday effect
(b) Ducting
(c) Tropospheric scatter
(d) Ionospheric reflection
10. Which of the following antenna is best excited from a waveguide :
(a) Horn
(b) Discone
(c) Helical
(d) Biconical
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Microwave Communication Systems » Exercise - 1 7. If the correction factor k equals 4/3 of the earth’s curvature, the microwave beam would have a curvature that is …………… than that of the earth. (a) more (b) less (c) equal (d) not related- Practical Antennas » Exercise - 1 1. Which is a non-resonant antenna ? (a) rhombic antenna (b) folded dipole (c) end-fire array (d) yagi-uda antenna 2. Gain of a half-wave dipole antenna over isotropic. (a) 2.15 dB (b) 1.76 dB (c) 1 dB (d) 0 dB 3. What is the polarization of a discone antenna ? (a) vertical (b) horizontal (c) circular (d) spiral 4. What is the gain of the Hertzian dipole over isotropic antenna ? (a) 1.64 dB (b) 2.15 dB (c) 1.76 dB (d) 1.55 dB 5. Which antenna radiates an omnidirectional pattern in the horizontal plane with vertical polarization ? (a) marconi antenna (b) discone antenna (c) horn antenna (d) helical antenna 6. An antenna with very high gain and very narrow beamwidth. (a) helical antenna (b) discone antenna (c) horn antenna (d) parabolic dish antenna 7. What is the radiation characteristic of a dipole antenna ? (a) omnidirectional (b) bidirectional (c) unidirectional (d) hemispherical 8. An antenna which is one-tenth wavelength long. (a) hertzian dipole (b) loop antenna (c) marconi antenna (d) elementary doublet 9. ………. is an open-ended slot antenna. (a) helical antenna (b) rhombic antenna (c) notch antenna (d) cassegrain antenna 10. What is the gain of isotropic antenna ? (a) 10 (b)…
- Microwave Communication Systems » Exercise - 1 5. The microwave beam curves the same than that of the earth when the value of the correction factor k equals : (a) 0 (b) 4/3 (c) 2/3 (d) infinity
- Microwave Communication Systems » Exercise - 1 6. The free space attenuation between two microwave antennas 40 km apart operating at 8 GHz is : (a) 146.7 dB (b) 142.55 dB (c) 82.5 dB (d) 86.7 dB
- Microwave Communication Systems » Exercise - 1 1. The most widely used microwave antenna : (a) half-wave dipole (b) parabolic (c) hyperbolic (d) horn