Helical antenna with integral J-shaped impedance and mounting el

Details Helical antenna with integral J-shaped impedance and mounting el Helical antenna with integral J-shaped impedance and mounting el

1995-02-22

1997-12-23

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With housing or protective covering

343895, H01Q 140, H01Q 1108

Patent

active

057011290

ABSTRACT:
An antenna element is composed by molding with an armor, and therefore if a slight deformation is caused by external force, the antenna characteristics are hardly changed. In particular, by the helicoid constitution of the antenna, changes of the pitch of antenna element and coil length are small, so that an antenna of excellent characteristics may be obtained. Moreover, by forming a hollow part in the armor and holding part of the helicoid part by the armor, more excellent antenna characteristics may be obtained.

REFERENCES:
patent: 3828353 (1974-08-01), Majkrzak et al.
patent: 4169267 (1979-09-01), Wong et al.
patent: 4435713 (1984-03-01), Gasparaitis et al.
patent: 4435716 (1984-03-01), Zandbergen
patent: 4725395 (1988-02-01), Gasparaitis et al.
patent: 4742359 (1988-05-01), Ishino et al.
patent: 5134422 (1992-07-01), Auriol
patent: 5216436 (1993-06-01), Hall et al.
patent: 5479182 (1995-12-01), Sydor
The ARRL Antenna Book, published by the American Radio Relay League, Newington, CT, 15th Ed., 1988, pp. 16-21 to 16-25.

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