Q2] The maximum radiation intensity of a 90% efficiency antenna is 200 mW per unit solid angle. Find the directivity and gain (dimensionless and in dB) when the: (a) input power is 125.66 mW, (b) radiated power is 125.66 mW.
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9 - Input power (\(P_{\text{in}}\)) = 125.66 mW - Radiated power (\(P_{\text{rad}}\)) = 125.66 mW Show more…
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2.13. The normalized radiation intensity radiated by an antenna is given by U(θ, φ) = { sin θ cos² φ, 0° ≤ θ ≤ 180°, 90° ≤ φ ≤ 270° 0, Elsewhere The maximum of the radiation intensity occurs towards θ = 90° and φ = 180°. Find the: (a) Exact maximum directivity (dimensionless and in dB). (b) Half-power beamwidth (in degrees) in the principal azimuth (horizontal) plane. (c) Half-power beamwidth (in degrees) in the principal elevation (vertical) plane. (d) Maximum directivity (dimensionless and in dB) using an appropriate approximate method that you know. Indicate which one you are using.
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An antenna has a gain of 20 dB. It is fed by a 300-foot coaxial cable having an attenuation of 3.6 dB per 100 ft at 200 MHz. The transmitter output is 60 W. Calculate: (a) Total attenuation (b) Power output to the antenna (c) Effective radiated power.
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