Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Patent
1985-07-01
1988-03-08
LaRoche, Eugene R.
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
343794, 343802, 343822, 343727, 343749, 343895, H01Q 918
Patent
active
047301953
ABSTRACT:
A shortened wideband decoupled sleeve dipole antenna is disclosed in which a helically wound upper radiating element and an inductively loaded lower radiating sleeve element reduce the linear size of the antenna. Substantial decoupling is provided by a helically wound feed coaxial transmission line within the sleeve element. A matching network at the antenna feed point provides capacitive reactance above the antenna resonant frequency and inductive reactance below the antenna resonant frequency such that an impedance match between the feed coaxial transmission line is obtained at frequencies above and below the resonant frequency and dual-band performance may be obtained.
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Kazecki Henry L.
Phillips James P.
Hackbart Rolland R.
Jenski Raymond A.
LaRoche Eugene R.
Lee Benny T.
Motorola Inc.
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