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Cross slot omnidirectional antenna

  • US 3,969,730 A
  • Filed: 02/12/1975
  • Issued: 07/13/1976
  • Est. Priority Date: 02/12/1975
  • Status: Expired due to Term
First Claim
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1. An antenna for radiating radio frequency energy at preselected frequency comprising:

  • a hollow member having thin conductive walls, said member being four way symmetric about a vertical axis and having a maximum horizontal dimension of less than one wavelength at said preselected frequency, said member having a plurality of horizontal slots having lengths less than two-thirds of a wavelength at said preselected frequency, said slots spaced vertically in two rows, each row centered on a point of maximum horizontal dimension, and said two rows spaced symmetrically about said vertical axis, forming vertically stacked pairs of cross slot radiating elements,power divider means having an input for receiving RF energy at said preselected frequency and one output for each of said slot radiating elements andmeans for coupling RF energy from said power divider means to said slots to be radiated,whereby said RF energy is radiated in an omnidirectional pattern.

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