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Electronic beam tilting using a single reactively loaded circular wire loop antenna

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2 Author(s)
Scott, H. ; Sch. of Electr. & Electron. Eng., Queen''s Univ., Belfast, UK ; Fusco, V.F.

The near-field current distribution along a circular loop wire antenna is modified by the inclusion of an electronically controllable reactive load, a varactor diode, into the antenna to provide beam pattern shaping. Modifications to a 4:1 balun are shown which permit varactor biasing while facilitating the impedance match of the circular loop, VSWR 1.3 to 1.9; this VSWR is superior to that previously reported for a reactively loaded wire antenna. In addition, it is shown that a reactively loaded dipole structure can provide only 10° beam tilt while the circular wire loop structure provides up to 27° beam tilt.

Published in:

Microwaves, Antennas and Propagation, IEE Proceedings  (Volume:149 ,  Issue: 56 )