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Microstrip antenna system with multiple frequency elements

  • US 4,933,680 A
  • Filed: 09/29/1988
  • Issued: 06/12/1990
  • Est. Priority Date: 09/29/1988
  • Status: Expired due to Term
First Claim
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1. An antenna system comprising:

  • an array of microstrip antenna elements, each of said elements comprising a first radiator, a second radiator, and a circulator;

    power dividing means connected to an input terminal of each of said antenna elements; and

    whereinin each of said elements, said circulator has a plurality of ports, a first of said ports connecting at said input terminal with said power dividing means, a second of said ports connecting with said first radiator, and a third of said ports connecting with said second radiator;

    in each of said elements, said second radiator is operative to radiate in a second frequency band higher than a first radiation frequency band of said first radiator, said first radiator reflecting radiation of said second frequency band via said circulator to said second radiator;

    said power dividing means transmits radiation occupying the frequency bands of both radiators via said circulator in each of said antenna elements towards the input terminal in each of said elements; and

    corresponding ones of the radiators of said antenna elements are spaced apart with predetermined spacings for generation of a beam of radiation by the antenna system.

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