NON LINEAR DIELECTRIC BASED SPIRAL ANTENNA FOR BEAM ADAPTATION

摘要

A single spiral antenna is proposed for adaptive beam applications. A layer of Non Linear Dielectric, having dielectric anisotropy properties, is embedded within the substrate of the antenna. The net dielectric constant of antenna can be changed to a desired value by applying suitable bias voltage to the Non Linear Dielectric layer It is shown that the beam is steerable in various directions depending upon the net value of the dielectric constant wife VSWR staying at or fewer than two and gain slaying uniform within ±1 dB. These results are also compared wife results of another technique for beam steering, insertion of short/open circuit dements on antenna arm, which has already been disclosed