The log-periodic staggered-folded-dipole antenna

Details The log-periodic staggered-folded-dipole antenna The log-periodic staggered-folded-dipole antenna

H - Electricity

01

Q

H01Q 5/00 (2006.01) H01Q 11/10 (2006.01)

Patent

CA 2260380

The log-periodic dipole antenna presents these problems. If the dipoles are supported by two parallel feeder conductors, those conductors are above ground potential and should not be connected to the mast for lightning protection. The feeder conductors also must be strong and, therefore heavy, because they support the dipoles. One tactic to solve these problems is to connect the dipoles to the boom through strong insulators and to feed them by a pair of crossing wires. Not only do the crossing wires not have a constant characteristic impedance, as the feeder conductors should have, this tactic also does not ground the antenna for lightning protection. These problems can be solved by using folded dipoles that have feeding points on opposite sides of the main conductors. This allows straight, small, feeder conductors, no strong insulators, and direct current paths from all conductors to the grounded mast.

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