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US 5,349,361 AGranted
Three-wave antenna for vehicles
AssigneeHarada Kogyo Kabushiki Kaisha
InventorsYoshimi Egashira, Ryouichi Miyakawa
Life of this patent
Estimating the term…
Abstract
A vehicle antenna for AM/FM and MT waves including a first antenna element for MT waves vertically mounted on the vehicle roof and a second antenna element for AM/FM waves rotatably coupled to the top end of the first antenna element so that the second antenna element can be set at a desired angle relative to the roof of the vehicle. A trap element for blocking MT waves is installed near the lower end of the second antenna element.
Claims3
A three-band antenna for use in automobiles comprising:
- a first antenna element which is installed perpendicularly on an automobile roof and is 1/4 wavelength long in telephone frequency band and resonates in the telephone frequency band;
- a second antenna element with its base coupled to the top part of said first antenna element via a shaft supporting assembly which is capable of rotating, said second antenna element together with said first antenna element being 1/4 wavelength long in a FM band and resonating in the FM band;
- and said first and second antenna elements function in the AM radio reception band;
- and a trap element for blocking said telephone frequency band, said trap element being interposed between said first and second antenna elements.
1 more element
Dependencies are inferred from the claim text.