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Continuously variable phase-shifter for electrically down-tilting an antenna

  • US 5,798,675 A
  • Filed: 02/25/1997
  • Issued: 08/25/1998
  • Est. Priority Date: 02/25/1997
  • Status: Expired due to Term
First Claim
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1. A phase-shifter capable of varying continuously the down-tilt of a radiation pattern associated with an antenna for an RF signal, the antenna having a plurality of antenna elements and having an element terminal (12-15) for each antenna element, and further having a feed system (9 and 7) for communicating the RF signal between each element terminal (12-15) and a common feed terminal (11), the feed system including a stripline (9) spaced above a metallic ground plane (7), the phase-shifter comprising:

  • a plurality of phase wheels (6a-f) each having a shaped dielectric (17) distributed throughout, and each rotatably positioned between the metallic ground plane (7) and the stripline (9) wherein each phase wheel is held in tractive engagement with at least one of the other phase wheels in such an arrangement that all of the phase wheels are tractively coupled one to another; and

    means (8) for rotating one of the phase wheels (6a-f) relative to the stripline (9), wherebv all of the phase wheels are turned in synchrony, with each varying, as it is turned, the amount of dielectric directly beneath the stripline;

    thereby causing the overall radiation pattern to vary in its down-tilt, the variation in down-tilting thus being produced by purely rotational mechanical motion.

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