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Q. What do you mean by Antenna gain?
Antenna gain depends on both shape and size. Dipole antennas, commonly used at lower radio frequencies, are made up of a rod or wire of length λ/10 to λ/2, and have an antenna-gain range of 1.5 to 1.64 (1.8 to 2.1 dB). Horn antennas and parabolic dishes (so named after their shapes) have much more gain at higher frequencies. A useful, although approximate, expression for gain is given by
where λ is the wavelength being transmitted (or received), and Ae is the effective aperture or effective area of the antenna. Power amplifiers are needed to overcome the radio-transmission loss just as in a transmission-line system. Similar considerations hold for optical radiation, in which the electromagnetic wave takes the form of a coherent light beam.
Figure shows the cross-section of an electrostatic problem with translational symmetry: a rectangular coaxial cable. The inner conductor is held at 10 volts and the outer conductor
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Q. Draw the circuit of a two stage RC coupled amplifier?
Q. An RG-139/U rectangular waveguide is given to have dimensions a = 0.8636 mm and b = 0.4318 mm. Compute the theoretical and practical frequency ranges of operation for the guide.
Microprocessor and its Applications
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Q. Explain how presentation layer helps in processing and establishing data in End to End layers. Ans: The purpose of presentation layer is to represent information to commu
Q. Reduce the circuit of Figure to a Thévenin and a Norton equivalent circuit with respect to terminals a-b.
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