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Helical antenna for portable radio communication equipment

  • US 5,359,340 A
  • Filed: 09/30/1992
  • Issued: 10/25/1994
  • Est. Priority Date: 09/30/1992
  • Status: Expired due to Fees
First Claim
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1. A small size helical antenna for radio communication equipment including at least one of a portable transmitter/receiver, a pocket telephone, and a small power type mobile telephone, said helical antenna comprising:

  • a first conductor being continuously wound helically from a top end to a bottom end, said first conductor connected to a casing of said equipment; and

    a second conductor being helically wound together in parallel with said helically wound first conductor with a predetermined space between facing surfaces thereof;

    wherein said second conductor having a same length as said first conductor, a predetermined length from a top end of said second conductor is folded in parallel to a remaining portion of said second conductor to form a folded part with said predetermined space between facing surfaces thereof, an unfolded part thereof is helically wound in parallel together with said first conductor with a bottom end of said second conductor aligned with said bottom end of said first conductor to form a parallel feeder, and said folded part of said second conductor and a predetermined length from said top end of said first conductor comprise a radiator.

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