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US 5,534,880 AGranted
Stacked biconical omnidirectional antenna
AssigneeGabriel Electronics Incorporated
InventorsDonald D. Button, William D. Wyatt, James F. McGrath
Life of this patent
Estimating the term…
Abstract
An omnidirectional antenna with minimal gain variation over the 360.degree. azimuth. A plurality of biconical antennas are stacked vertically. A radome covering the antenna and cylindrically encasing the antenna supports the stack of biconical antennas. A bundle of transmission lines is helically wound about the cylindrical periphery of the biconical antennas, preferably at an angle between 37.degree. and 41.degree.. Each biconical antenna is formed by two truncated flared apart reflecting surfaces that are connected by a nonconductive spacing collar between their truncated portions.
Claims16
An omnidirectional antenna comprising:
- a plurality of axially aligned electromagnetic energy radiating elements;
- a plurality of truncated flared apart reflecting surface pairs connected in an aligned stack, each pair including an upper surface disposed above and a lower surface disposed below one of said radiating elements, adjacent pairs in the stack being attached to one another about their outer circumferences;
- the upper and lower surfaces of each of said pairs of reflecting surfaces being separated a fixed distance apart along the axis thereof by only nonconductive means therebetween, said nonconductive means including a plurality of nonconductive spacing collars, each positioned between the upper and lower surfaces of one of said pairs of reflecting surfaces along the axis thereof and around the respective radiating element disposed between said one of said pairs of reflecting surfaces;
- a radome forming a cylinder about the outer circumference of the reflecting surfaces of said plurality of truncated flared apart reflecting surface pairs wherein said plurality of truncated flared apart reflecting surface pairs are not surrounded by a polarizing enclosure;
- a power divider supported beneath a lowermost reflecting surface of said plurality of truncated flared apart reflecting surface pairs;
- a plurality of transmission lines electrically connected to said power divider, a first of said transmission lines extending beneath said lowermost reflecting surface into connection with the radiating element disposed above said lowermost reflecting surface, the remaining transmission lines being helically directed along the cylinder formed by said radome, each of said remaining transmission lines extending from adjacent the cylinder formed by said radome into connection with one of said radiating elements and being fed between an upper surface of one of said reflecting surface pairs and a lower surface of a second one of said reflecting surface pairs, the second one of said reflecting surface pairs being located immediately above said one of said reflecting surface pairs.
3 more elements
An omnidirectional antenna comprising:
- a plurality of axially aligned electromagnetic energy radiating elements;
- a plurality of truncated flared apart reflecting surface pairs connected in an aligned stack, each pair including an upper surface disposed above and a lower surface disposed below one of said radiating elements, adjacent pairs in the stack being attached to one another about their outer circumferences;
- a plurality of nonconductive spacing collars, each positioned between the upper and lower surfaces of one of said pairs of reflecting surfaces along the axis thereof and around the respective radiating element disposed between said one of said pairs of reflecting surfaces;
- a plurality of pairs of hubs, each hub having an annular groove for maintaining one of said nonconductive spacing collars therein, each of said pairs of hubs including two hubs mounted opposite one another with one of the two hubs in the upper surface of one of said truncated flared apart reflecting surface pairs and the other of the two hubs in the lower surface of said one of said truncated flared part reflecting surface pairs so as to hold a nonconductive spacing collar therebetween in the grooves of the two hubs;
- a stiff radome forming a cylinder about the outer circumference of the reflecting surfaces of said plurality of truncated flared apart reflecting surface pairs;
- means for attaching said radome to said reflecting surface pairs so that said reflecting surface pairs are supported in a vertical stack by said radome;
- and
- means for conducting electromagnetic energy to each of said radiating elements.
5 more elements
Dependencies are inferred from the claim text.