Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1981-07-20
1983-03-01
Moore, David K.
Communications: radio wave antennas
Antennas
Spiral or helical type
343749, H01Q 136
Patent
active
043756425
ABSTRACT:
To provide a short FM antenna, of about for example 40 cm length for mobile radio, for example automobile radio application, without degradation of signal strength with respect to an about 1 m long FM antenna, a conically tapering insulating rod, for example of fiberglass, has two windings applied thereover, the two windings, each, having a straight wire length of about 1/4 the median wavelength of the FM band, and the overall length (l) of the rod having said two windings applied thereover being about 1/8 of the median wavelength. The oppositely wound windings (11, 12) are connected at their center, and may be formed as one bifilar winding, with the lower end of the lower winding being connected to an electrical terminal for standard connection to, for example, a coaxial antenna connector for an automobile radio. A spiral spring can be interposed if extreme deflectability of the antenna is desired, for example to prevent damage if the antenna, applied to an automotive vehicle, is passed through a power washing and scrubbing station.
REFERENCES:
patent: 3249945 (1966-05-01), Lewis
patent: 4101898 (1978-07-01), Ingram
patent: 4270128 (1981-05-01), Drewett
Dorrie Horst
Klinkwitz Kurt
Moore David K.
Robert & Bosch GmbH
LandOfFree
Rod antenna, particularly for mobile FM signal transducing appli does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rod antenna, particularly for mobile FM signal transducing appli, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rod antenna, particularly for mobile FM signal transducing appli will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1461762