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US 5,808,584 AGranted
Dipole television antenna
AssigneeNTL Technologies Inc.
InventorGeorge Skahill
Life of this patent
Estimating the term…
Abstract
A dipole antenna with folded back ends. Linear conductor elements are fed by a balanced two-wire transmission line which is connected to a balun transformer in turn connectable to a coaxial line. Preferably, the balun transformer is a small device, made of a ferrite donut wound with thin wire and occupying less than one cubic inch. The transformer is preferably located at the feed point and can then be incorporated into the antenna.
Claims6
A television antenna device comprising:
- A first linear conductor having a central segment and a pair of opposite end segments folded back to overlap said central segment, said end segments extending substantially parallel to said central segment and spaced therefrom;
- a second linear conductor approximately half as long as said first linear conductor, said second linear conductor having a first major portion and a first end portion folded back at a first fold to overlap said first major portion, said first end portion extending substantially parallel to said first major portion in spaced relation thereto, said first end portion being connected at an end opposite said first fold to one of said end segments defining a first end section;
- and
- a third linear conductor approximately half as long as said first linear conductor, said third linear conductor having a second major portion and a second end portion folded back at a second fold to overlap said second major portion, said second end portion extending substantially parallel to said second major portion in spaced relation thereto, said second end portion being connected at an end opposite said second fold to another of said end segments defining a second end section, said first, second and third linear conductors having a combined electrical length of approximately one wavelength at a first frequency, f.sub.1, said first and second end sections each having an electrical length of approximately 1/4 wavelength at a second frequency, f.sub.2, said second frequency being substantially equal to 4.multidot.f.sub.1,
- whereby the antenna device efficiently receives wireless television signals at essentially all channels without adjustment circuits.
2 more elements
Dependencies are inferred from the claim text.