what is antenna

It is clear from this equation that if h is large, d will be large. This explains as to why the television broadcasts are made from tall antennas..

When free space is the communication channel, antennas radiate and receiver the signal. Theory shows that the antennas operate effective only when their dimensions are of the order of the magnitude of wavelength of the signal being transmitted...

Jeff saw a photograph of an antenna and it measured 9 meter in length. What would be the actual length of the antenna, if the scale is 0.3 meter : 4 meter? => 120 meters or 121 meters or 119 meters or None of the above..

The radio horizon for space waves is about four-thirds as far as the optical horizon. This beneficial effect is caused by the varying density of the atmosphere, and because of diffraction around the curvature of the Earth. The radio horizon of an antenna is given, with good approximation,..

Question: Why did Ch-tsal try so hard to grow his feathers and whiskers? Answer: Ch-tsal groomed his feathers and whiskers because they were filters, temperature controllers, respirators and much more. His whiskers, were receivers, antennae, language-carriers, voice and his ..

The satellite communication is costly because of the limited life of a satellite. A geosynchronous satellite using high gain antenna requires close control of both its position and altitude. The position and altitude control rockets require fuel that has to be put in once for all before ..

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Any tall or massive objects will obstruct space waves, since they travel close to the ground. Consequently, shadow zones and diffraction will result. This is the reason for the need in some areas for antennas higher than would be indicated by Equation (1). On the other hand, some areas re..

It is a pair of point charges with equal magnitude and opposite in sign separated by a distance. Many physical systems from molecules to TV antenna can be described as electric dipoles. A water molecule is an example of an electric dipole. Even though the water molecule as such is neutral..

Electric Dipole - It is a pair of point charges with equal magnitude and opposite in sign separated by a distance. Many physical systems from molecules to TV antenna can be described as electric dipoles. A water molecule is an example of an electric dipole. Even though the water molecule ..