Antenna coil and transmission antenna

Details Antenna coil and transmission antenna Antenna coil and transmission antenna

2006-07-25

2006-07-25

Ho, Tan (Department: 2821)

Communications: radio wave antennas

Antennas

Including magnetic material

Reexamination Certificate

active

07081864

ABSTRACT:
In a transmission antenna provided with an antenna coil outfitted with a core whereon a coil is mounted by winding, and with a capacitor connected to the aforementioned coil forming a serial resonance circuit between the aforementioned antenna coil inductance, the aforementioned antenna coil is outfitted with small core screw with a core smaller than the aforementioned core, and with a joining material that magnetically joins the aforementioned screw to the aforementioned core and with a screw hole that serves as a non-magnetic distance adjuster whereby the distance between the aforementioned core and the aforementioned screw is adjustable, and the resonance frequency is set by adjusting the thread volume of the aforementioned screw.

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patent: 58-172208 (1983-11-01), None
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Hasegawa, K., “Ferrite Antenna”, Patent Abstracts of Japan, JP No. 59-152703, Aug. 31, 1984.
Takamiya, I. et al., “Contactless IC Card Communication Equipment”, Patent Abstracts of Japan, JP No. 09-270742, Oct. 14, 1997.
Ieda, S. et al., “Loop Antenna Device”, Patent Abstracts of Japan, JP No. 2001-257526, Sep. 9, 2001.

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