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elementary theory of aer1als
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aerial array aerial system AERIALS FOR METRE aircraft antennas aperture approximation arrangement Babinet's principle backward radiation band width beam calculated capacity centre Chapter characteristic impedance circuit concentric line current distribution Curve cylindrical aerial DECIMETRE WAVE-LENGTHS driven element earth effect electrical length equal equation equivalent feeder feeding field strength frequency front-to-back ratio full-wave dipole gain given gives half-wave dipole Hertzian dipole horizontal polarization input impedance input resistance Instn Elect insulators isotropic source linear load matched maximum Mcyc./sec METRE AND DECIMETRE mutual impedance obtained ohms open-circuit parasitic elements phase plane polar diagram power-gain produce radar radiation resistance Radio Engrs reactance receiving aerial resonant length resonant resistance result right angles Schelkunoff Schelkunoff's value screen self-impedance shown in fig sinusoidal current sinusoidal theory slot aerials spacing standing wave ratio stub switch terminated theoretical thin aerials transmission line transmitting aerial unipole vertical polarization voltage wide-band wire Yagi aerials