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Microstrip radiator with folded resonant cavity

  • US 4,131,893 A
  • Filed: 04/01/1977
  • Issued: 12/26/1978
  • Est. Priority Date: 04/01/1977
  • Status: Expired due to Term
First Claim
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1. In an antenna for operation at a predetermined frequency, of the type including a resonant cavity defined between two conductive sheets also defining a radiating aperture between the edge of at least one of the sheets and the remaining sheet, said resonant cavity having a longitudinal resonant dimension approximately equal to a predetermined multiple of one-quarter of a wavelength at said predetermined frequency, said cavity resonant dimension being no larger than one wavelength of said predetermined frequency, the improvement wherein:

  • said resonant cavity is folded along at least one axis transverse to said resonant dimension such that the longitudinal size of said antenna is reduced.

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