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Low loss quadrature matching network for quadrifilar helix antenna

  • US 5,594,461 A
  • Filed: 05/25/1995
  • Issued: 01/14/1997
  • Est. Priority Date: 09/24/1993
  • Status: Expired due to Fees
First Claim
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1. A quadrature matching network in a quadrifilar antenna assembly of a quadrifilar helical antenna of first, second, third and fourth antenna elements of a radio, each antenna element having a proximal end and a distal end being a free end, each antenna element being coupled, at its proximal end only, to the quadrature matching network each antenna element having an impedance, and each antenna element communicating signals in a 90 degree phase relationship with respect to any adjacent one of the antenna elements, the quadrature matching network comprising:

  • a first transmission line element of a characteristic impedance matching the impedance of the second antenna element to the impedance of the first antenna element, the first transmission line element coupling the second antenna element to the first antenna element and transforming the phase of the communicated signal of the second antenna element to the phase of the communicated signal of the first antenna element;

    a second transmission line element of a characteristic impedance matching the impedance of the fourth antenna element to the impedance of the third antenna element, the second transmission line element coupling the fourth antenna element to the third antenna element and transforming the phase of the communicated signal of the fourth antenna element to the phase of the communicated signal of the third antenna element;

    a third transmission line element having a characteristic impedance matching the impedance of the coupled third and fourth antenna elements to the impedance of the coupled first and second antenna elements, the third transmission line element coupling the third and fourth antenna elements to the first and second antenna elements and transforming the phase of the communicated signal of the coupled third and fourth antenna elements to the phase of the communicated signal of the coupled first and second antenna elements; and

    a fourth transmission line element having a characteristic impedance matching the impedance of the coupled first, second, third and fourth antenna elements to the impedance of the radio wherein said first, second, third and fourth transmission line elements are combined on a single circuit board spaced at the proximal ends of said first, second, third and fourth antenna elements.

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