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TITLE : How to relate antenna gain concept with fundamental concept of optical lens ABSTRACT Microwave refers to the technology of transmitting information or power by the use of radiowaves whose wavelengths are conveniently measured in small numbers of centimeters. Microwaves are widely used for point-to point communications because their small wavelength allows conveniently-sized antennas to direct them in narrow beams, which can be pointed directly at the receiving antenna. 1.0 INTRODUCTION T
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  TITLE : How to relate antenna gain concept with fundamental concept of optical lens  ABSTRACT Microwave refers to the technology of transmittinginformation or power by the use of radiowaves whose wavelengths are conveniently measured in small numbers of centimeters.Microwaves are widely used forpoint-to pointcommunications because theirsmallwavelengthallows conveniently-sizedantennasto direct them in narrow beams, which can be pointed directly at the receiving antenna. 1.0 INTRODUCTION The term Antenna Gain describes howmuch power is transmitted in the directionof peak radiation to that of an isotropicsource. Antenna gain is more commonlyquoted in a real antenna's specificationsheet because it takes into account theactual losses that occur.Antenna Gain is sometimes discussedas a function of angle, but when a singlenumber is quoted the gain is the 'peak gain'over all directions.A lens is anopticaldevice with perfector approximateaxial symmetrywhichtransmits andrefractslight,converging or diverging thebeam.Asimple lensconsists of a single optical element. Amicrowavelens can be made fromparaffin wax.  2.0 CONTENTS In optical science and engineeringlight is commonly controlled by redirectingthe wave front of propogation radiation bylens, mirror and diffraction element.Antenna gain perform well in line of sightappplication. Lens play a similar role tothat reflector in reflector of the antenna.They collimate divergent energy. Theantenna will radiated more energy in samedirection in others. An optical provides avery narrow gain function. We can viewthe concpet of optical ususally referred asthe IFOV or angular resolution which isthe angular measured of how sensitive theinstrument to its direction.The concept of optic that based on myunderstanding is when the light is hit thelens (concave or convex), one will diffractand another one will focusing at the onepoint. Its the same concept with theantenna gain will received the signal basedon the lens in the sensor.At optical frequencies, on the contrary,electromagnetic fields are controlled by re-directing the wave fronts. Because thistype of manipulation is based on the wavenature of electromagnetic fields, it cannotbe used to control fields on thesubwavelength scale. In contrast, radiowave and microwave technologypredominantly uses antennas to manipulateelectromagnetic fields, controlling them onthe subwavelength scale and interfacingefficiently between propagating.Figure 1 : Type of Lens    Figure 2 : Antenna Gain CONCLUSION So, we can conclude that antenna gainand optical lens have related concept.Antenna gain perform well in line of sightappplication and lens play a similar role tothat reflector in reflector of the antenna.
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