×

Three resonator parasitically coupled microstrip antenna array element

  • US 4,835,538 A
  • Filed: 01/15/1987
  • Issued: 05/30/1989
  • Est. Priority Date: 01/15/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. A broadbanded microstrip antenna comprising:

  • a conductive reference surface;

    a driven conductive RF radiator element spaced less than one-tenth of a wavelength above said reference surface;

    a conductive RF feedline connected to said driven element;

    a first passive conductive RF radiator element spaced above and capacitively coupled to said driven element, said first passive element being electrically isolated from said driven element and said conductive reference surface; and

    a second passive conductive RF radiator element spaced above said first passive element and capacitively coupled to said driven element, said second passive element being electrically isolated from said driven element and said conductive reference surface,wherein the sizes of said driven, first and second elements, the spacings between said driven, first and second elements, and the Quality factors of said driven, first and second elements are dimensioned to account for inter-element capacitance between said driven element, first passive element and second passive conductive elements and said antenna resonates over a wide, substantially continuous band of frequencies, said driven element being effectively coupled in series by inter-element capacitance with said first and second passive elements, said first and second passive elements being effectively coupled in parallel with one another by inter-element capacitance.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×