Disc-on-rod end-fire microwave antenna
First Claim
Patent Images
1. A plate-on-rod end-fire antenna comprising a launcher and end-fire radiator exhibiting close to optimum gain over a range of lengths between 3λ
- and 12λ
where λ
is the wavelength at the operating frequency, and having a principal axis adapted to be energized by the launcher at the non-radiating end of said radiator for the transmission of energy wavelength λ
in the direction of the axis, the electrically active components of said radiator consisting of a plurality of substantially thin identical electrically conductive round plates substantially uniformly spaced between 0.18λ and
0.23λ
apart, along said axis, with the plane of the plates normal to said axis, to form an elongated radiator fitting within a circumscribing cylinder, coaxial with said principal axis, the difference between the diameter of said cylinder and the diameter of an axial conductive support rod supporting said plates being greater than 0.23λ and
less than 0.27λ
.
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Abstract
A disc-on-rod end-fire type antenna is disclosed in which close to optimum gain is maintained over a large range of antenna lengths, using the same disc size and spacing for all lengths.
11 Citations
12 Claims
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1. A plate-on-rod end-fire antenna comprising a launcher and end-fire radiator exhibiting close to optimum gain over a range of lengths between 3λ
- and 12λ
where λ
is the wavelength at the operating frequency, and having a principal axis adapted to be energized by the launcher at the non-radiating end of said radiator for the transmission of energy wavelength λ
in the direction of the axis, the electrically active components of said radiator consisting of a plurality of substantially thin identical electrically conductive round plates substantially uniformly spaced between 0.18λ and
0.23λ
apart, along said axis, with the plane of the plates normal to said axis, to form an elongated radiator fitting within a circumscribing cylinder, coaxial with said principal axis, the difference between the diameter of said cylinder and the diameter of an axial conductive support rod supporting said plates being greater than 0.23λ and
less than 0.27λ
. - View Dependent Claims (3, 5, 6, 7, 8, 9, 10, 11, 12)
- and 12λ
-
2. A plate-on-rod end-fire antenna comprising:
-
(a) a launcher for radiating a signal of wavelength λ
, and(b) a plate-on-rod end-fire radiator element exhibiting close to optimum gain over a range of lengths between 3λ and
12λ
where λ
is the wavelength at the operating frequency comprising an axial conductive support rod, having a length of between 3λ and
12λ
, and a dimension "d" transverse to the axis of said rod and a plurality of thin plates substantially uniformly spaced between 0.18λ and
0.23λ
along said rod, said plates having a dimension D in a plane containing both the electric vector of the signal radiated by said launcher and the element axis, and wherein the difference between the dimension D and the dimension d of said axial conductive support rod supporting said plates being greater than 0.23λ and
less than 0.27λ
. - View Dependent Claims (4)
-
Specification