Helical antenna for portable radio communication equipment

Details Helical antenna for portable radio communication equipment Helical antenna for portable radio communication equipment

1992-09-30

1994-10-25

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Active sleeve surrounds feed line

343895, H01Q 1108

Patent

active

053593405

ABSTRACT:
A small size helical antenna for radio communication equipment such as a portable transmitter/receiver, a pocket telephone, or a mobile telephone of small power type. The helical antenna is comprised of first and second parallel conductors wound in a coil shape. The second conductor is folded in parallel to the remaining part of the second conductor at some length in accordance with the transmitting/receiving frequency from the top end. The folded part and the upper part of the first conductor form a radiator of the dipole antenna structure and the parallel part of the first and the second conductors form a parallel feeder. The third conductor having the same length as the folded part may be provided on the lower part of the second conductor. According to the above-described structure, no return current flows from the helical antenna to the casing of the radio communication equipment on which the helical antenna is connected, thereby the directivity becomes maximum in a horizontal plane and an effect caused by holding the casing by a human hand is decreased.

REFERENCES:
patent: 4161737 (1979-07-01), Albright
patent: 4270128 (1981-05-01), Drewett
patent: 5061942 (1991-10-01), Dorrie et al.
"Dipoles and Monopoles", Chen To Tai, Antenna Engineering Handbook, 2nd Edition, Chapter 4, pp. 4-4-4-5.
"Helical Antennas", Howard E. King et al, Antenna Engineering Handbook, 2nd Edition, Chapter 13, pp. 13-2 to 13-19.

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