(a)antenna beam axis and array axis (b)antenna beam axis and axis of rotation (c)antenna 3 dB beamwidth in degrees (d)antenna null-to-null beamwidth in degrees
Answer
Answer : (b)
Explanation
Explanation : No answer description available for this question. Let us discuss.
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)…
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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)…