Foreshortened antenna structures
First Claim
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1. A foreshortened dipole antenna structure for operating at frequencies at and above 300 MHz, said structure having a longitudinal axis and comprising:
- two identical half-dipole sections with each section comprising;
an elongated conductive stem portion disposed along said axis having two ends for connection at one end to an excitation potential, said stem portion having a width dimension D; and
a conductive rectangular body portion having a width B where B>
D, said body portion connected only at the midpoint of one edge to the other end of said stem portion and folded over said stem at said midpoint of one edge, said body portion disposed parallel to said axis and spaced slightly from said stem portion to be electrically insulated therefrom;
each half-dipole section dipsosed along said axis, such that the excitation ends of said stems are spaced adjacent; and
said dipole antenna having an overall length much less than λ
/2 where λ
is the wavelength of the resonant frequency of the dipole antenna.
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Abstract
The foreshortened dipoles of the antenna described in U.S. Pat. No. 3,732,572 are further substantially shortened with a new construction in which each radiating element comprises two portions. A planar rectangular body electrically connects to the feed point by a stem portion which attaches to the rectangular body at the farthest point from the feed point and is spaced slightly from the plane of the body to electrically isolate the two portions.
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Citations
18 Claims
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1. A foreshortened dipole antenna structure for operating at frequencies at and above 300 MHz, said structure having a longitudinal axis and comprising:
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two identical half-dipole sections with each section comprising; an elongated conductive stem portion disposed along said axis having two ends for connection at one end to an excitation potential, said stem portion having a width dimension D; and a conductive rectangular body portion having a width B where B>
D, said body portion connected only at the midpoint of one edge to the other end of said stem portion and folded over said stem at said midpoint of one edge, said body portion disposed parallel to said axis and spaced slightly from said stem portion to be electrically insulated therefrom;each half-dipole section dipsosed along said axis, such that the excitation ends of said stems are spaced adjacent; and said dipole antenna having an overall length much less than λ
/2 where λ
is the wavelength of the resonant frequency of the dipole antenna. - View Dependent Claims (2, 3, 4, 5)
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6. A monopole antenna structure for connection to an energizing feed line comprising:
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a conductive elongated stem having a length L, a width D, and two ends for connection at one end to an energizing feed line, said stem also having a longitudinal axis disposed transversely to said feed line; a conductive body having a width B>
D, said body spaced slightly above the plane defined by said feed line and said stem axis, the other end of said stem opposite said one end thereof being connected to said body only along the edge thereof furthest from said feed line, said body and said stem being electrically isolated except at said connection;said monopole having a stem length L much less than λ
/4, where λ
is the wavelength at the resonant frequency of the monopole antenna. - View Dependent Claims (7, 8, 9)
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10. A foreshortened half-dipole antenna structure for operation at frequencies above 300 MHz, said structure having a longitudinal axis and comprising:
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an elongated conductive stem portion disposed along said axis having two ends for connection at one end to an excitation potential, said stem portion having a width dimension D; a conductive rectangular body portion having a width B where B >
D, said body portion connected only at the midpoint of one edge to the other end of said stem portion and folded over said stem at the connection, said body portion disposed parallel to said axis and spaced slightly from said stem portion to be electrically insulated therefrom;said half-dipole antenna having an overall length much less than λ
/4 where λ
is the wavelength at the resonant frequency of the half-dipole antenna. - View Dependent Claims (11, 12, 13, 14)
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15. A foreshortened dipole antenna structure for operating at frequencies above 300 MHz, said structure having a longitudinal axis and comprising:
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a pair of axially spaced half-dipole sections connected to energizing potential, said half-dipole sections extending in opposite directions and each comprising; an elongated conductive stem portion disposed along said axis having two ends, one end connected to said energizing potential, said stem portion having a width dimension D; and a radiating frame portion having a generally rectangular outline with a width dimension B where B>
D, said frame portion lying in a plane adjacent and parallel to and laterally spaced from said stem, electrically connected only at the midpoint of one edge to the other end of said stem portion and folded over said stem at said midpoint of one edge, said lateral spacing sufficient to maintain electrical isolation therefrom;said dipole antenna having an overall length much less than λ
/2 where λ
is the wavelength of the resonant frequency of the dipole antenna. - View Dependent Claims (16, 17, 18)
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Specification