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Film antenna apparatus

  • US 4,987,424 A
  • Filed: 11/13/1989
  • Issued: 01/22/1991
  • Est. Priority Date: 11/07/1986
  • Status: Expired due to Term
First Claim
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1. A flat antenna apparatus comprising:

  • a flexible insulating sheet which can be freely folded; and

    a flexible antenna made or a conductive foil and formed on said insulating sheet;

    said flexible antenna being a dipole antenna having two linear antenna elements extending in spaced, parallel relation to one another on one face of said sheet;

    a feeder portion for each of said linear antenna elements, said feeder portions extending in closely spaced, parallel relation to one another midway between said linear antenna elements;

    for each of said linear antenna elements, an extension coil electrically connecting said linear antenna element to the respective one of said feeder portions, each extension coil having a wave-like configuration of adjacent crests and troughs; and

    a linear short-circuit portion for each of said extension coils extending from the corresponding one of said feeder portions and crossing at least one section of said extension coil between adjacent crests and troughs to directly electrically connect each of said cross sections to said corresponding feeder portion, thereby achieving impedance matching of said antenna apparatus with respect to a receiving apparatus.

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