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By Y.T. Lo, S. W. Lee

Quantity three: Antenna functions covers the components of airplane, ships, different huge, complicated environments, satellites, distant sensins, geophysics, medication, path discovering, and AM, tv, and FM broadcasting. DLC: Antennas (Electronics)

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In this way a uniform phase taper across the aperture could be effected for beam deflection, or any desired phase distribution could be achieved for adaptive beam correction. The feasibility and practicality of liquid dielectric lenses as millimeter-wave antennas remains to be established. But the number of useful CLAD media is probably very large, and only very few have been studied [35]. Some of those explored so far were both flammable and toxic. , it was passed through the phase shifter cell at a constant flux rate.

Examples of leaky higher modes which can be employed for antenna purposes occur on groove guide and on microstrip. There, the dimensions of the guide are chosen such that it supports the first higher mode, and an appropriate feed arrangement ensures that only this mode is excited. In the following, tapered dielectric-rod antennas and periodic dielectric antennas are discussed in some detail. These antennas are already of substantial practical interest since dielectric waveguides will be employed in many applications throughout the millimeter-wave band and, in some form, are likely to be used as the basic transmission medium for integrated millimeter-wave devices operating above 100 GHz.

H-plane pattern of pyramidal dielectric-rod antenna fed by metal waveguide with horn launcher. (After Kobayashi, MiUra, and Lampe [106J, © 1982 IEEE) -------------------------------------------------------------------------- Millimeter-wave Antennas ! 17-43 ! 18-330 F: __~__~__~__~~__~__~ -90 -60 0 30 60 90 -3O~ S ~ -3O~~~~---,-~~ -90 -60 ~ 0 ~ ca Q 8 -10 ~ ~ -90 -60 ! ~ -3Q 0 30 10 60 90 -30 -90 IIJ I 0 I ~ 0 -10 I CI. -1O ~~ -- --.. j .... 8 dB I '\ ... .... 5° ""\. 3 dB ~ IIJ 90 ~-20 -20 ANGLE OF OBSERVAnON-DEGREES ~ 60 I ~-3O ca U IIJ 30 Q I !

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