Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 3, Issue -, Pages 154-156Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2004.832125
Keywords
Connected array; current sheet; current standing waves; edge effects; electronic scanning; finite array
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The concept of connected (or coupled) dipoles in a linear array, which improves wideband performance, is examined. A long wire with multiple feeds is the model, using rigorous moment method analysis. Edge waves of current appear not to be attenuated; around half-wave dipole length the current peaks are one wavelength apart, with deep nulls. For dipole lengths around quarter-wave the current peaks and dips are modest. This trend continues to shorter dipoles; for lengths of 0 1 wavelength or less, the current is nearly constant along the array. This approximates the current sheet of Wheeler; the impedance mismatch is much less severe than for an array of unconnected dipoles of the same dimensions.
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