Antenna device

Details Antenna device Antenna device

1992-02-18

1993-12-28

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Plural separate diverse type

343876, 343895, H01Q 136

Patent

active

052743888

ABSTRACT:
A small-sized antenna device is used for portable telephone equipment and is capable of preventing the receiving strength from being degraded due to a change in the application environment as well as the mounting thereof onto a small radio equipment case. The antenna device has a linear antenna for producing an electric current flux and a coil-shaped antenna for producing a magnetic current flux including a plurality of half-wavelength helical coils connected in series so as to have two adjacent coils coiled in opposite directions with respect to each other, and carries out polarization diversity. Degradation in the characteristics of both antennas due to differences in operational principle can be prevented from taking place simultaneously, resulting in realizing a good reception of a radiowave. In addition, the antenna axes of both antennas can be disposed in parallel and close to each other, thus miniaturizing the device itself.

REFERENCES:
patent: 4670717 (1987-06-01), Sender
"The Helical Antenna", J. D. Kraus, 7-3 Transmission and Radiation Modes of Monofilar Helices, pp. 274-277.

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