Coaxial fed helical antenna with director disk between feed and helix producing endfire radiation towards the disk

• US 3,184,747 A
• Filed: 09/21/1962
• Issued: 05/18/1965
• Est. Priority Date: 10/06/1961
• Status: Expired due to Term

• Current Assignee: Alfred Kach
• Original Assignee: Alfred Kach
• Inventors: Kach, Alfred
• Application Number:
  US04/225,249
• Time in Patent Office: 970 Days
• US Class Current: 343/840
• CPC Class Codes: H01Q 11/08 Helical antennas
• CPC Class Codes: H01Q 19/15 the primary radiating source being a line source, e.g. leaky waveguide antennas

Claims

1. A DIRECTIONAL ANTENNA COMPRISING IN COMBINATION:

(1) A CYLINDRICAL WIRE HELIX, (2) A COAXIAL FEEDER HAVING AN INNER CONDUCTOR AND AN OUTER CONDUCTOR, (3) A RADIAL COUPLING LINK CONNECTING ONE END OF SAID HELIX INNER CONDUCTOR, (4) A PARASITIC ANTENNA DISK DISPOSED AT THE JUNCTION BETWEEN SAID HELIX AND SAID OUTER CONDUCTOR, SAID DISK BEING CONNECTED TO SAID OUTER CONDUCTOR AND EXTENDING RADIALLY FROM THE HELIX AXIS TO AN OUTER DIAMETER SUBSTANTIALLY EQUAL TO THE MAIN DIAMETER OF SAID HELIX, AND (5) SAID COUPLING LINK AND AT LEAST A PORTION OF THE ADJOINING FIRST TURN OF SAID HELIX BEING SUBSTANTIALLY PARALLEL TO AND SPACED FROM SAID DISK BY A DISTANCE OF THE ORDER OF THE DIAMETER OF THE HELIX WIRE, WHEREBY SAID DISK ACTS AS A DIRECTOR PRODUCING A DIRECTIONAL RADIATION CHARACTERISTIC OF SAID ANTENNA IN THE DIRECTION FROM THE FREE END OF SAID HELIX TOWARDS SAID DISK.