Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1996-11-25
1999-11-30
Wong, Don
Communications: radio wave antennas
Antennas
Spiral or helical type
343702, H01Q 136
Patent
active
059950641
ABSTRACT:
The antenna element (1) of a long conductor is formed with at least one returned portion (1a) arranged substantially in parallel to a longitudinal direction of the antenna element. In practice, a physical length of the antenna element in the longitudinal direction is determined to such a length as to be substantially resonated in a first frequency band, and the at least one returned portion (1a) is formed in such a way as to be resonated in a second frequency band twice higher than the first frequency band on the basis of an electric coupling with the adjacent antenna element. Further, the antenna can be constructed in such a way that: an antenna element (1) of a long conductor is formed with at least one returned portion arranged substantially in parallel to a longitudinal direction of the antenna element in such a way that an electrical length thereof is substantially 3/4 wavelength of a frequency band of transmitted and received signals; and at least half element (213) of an electrical length of substantially 1/4 wavelength of the frequency band beginning from an end portion of the antenna element on a side opposite to a feeder portion (30) side is formed as an extended antenna piece extending substantially in non-parallel to the substantially parallel-formed antenna elements (211, 212).
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Abstract of Japanese patent application No. 8-84017/1996.
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A copy of certified U.S. patent application No. 07/266423, filed Nov. 2, 1988 which corresponds to Japanese.
Arai Michio
Horie Ryo
Kawahara Takao
Oshiyama Tadashi
Sato Atsushi
Ho Tan
Kabushiki Kaisha Yokowa, also trading as Yokowo Co., Ltd.
Wong Don
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