Stacked antenna structure for radiation of orthogonally polarized signals
First Claim
1. An antenna structure for radiating two orthogonally polarized signals comprising:
- a first radiating element including a first resonant cavity and at least a first radiating aperture;
a second radiating element including a second resonant cavity and at least a second radiating aperture; and
means for introducing a first applied signal to said first radiating element at a predetermined frequency and for introducing a second applied signal at said predetermined frequency but 90°
out of phase with respect to said first applied signal, to said second radiating element;
said first and second radiating elements being relatively disposed such that said first and second resonant cavities overlay each other and the radiating apertures thereof are relatively disposed at 90°
.
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Abstract
A resonant circularly or elliptically polarized microstrip radiator wherein the size of the radiator is reduced in the resonant or non-resonant dimensions, or both, without reducing the effective resonant dimension or substantially lowering the efficiency of the radiator. Reduction of the resonant dimension is provided by folding the resonant cavity, while reduction of the non-resonant dimension is facilitated by utilization of a low density, low loss dielectric, such that the loss resistance of the element is appreciable with respect to the radiation resistance of the element. The preferred embodiment comprises interdigitated antenna structures.
31 Citations
21 Claims
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1. An antenna structure for radiating two orthogonally polarized signals comprising:
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a first radiating element including a first resonant cavity and at least a first radiating aperture; a second radiating element including a second resonant cavity and at least a second radiating aperture; and means for introducing a first applied signal to said first radiating element at a predetermined frequency and for introducing a second applied signal at said predetermined frequency but 90°
out of phase with respect to said first applied signal, to said second radiating element;said first and second radiating elements being relatively disposed such that said first and second resonant cavities overlay each other and the radiating apertures thereof are relatively disposed at 90°
. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An antenna structure for radiating two orthogonally polarized signals comprising:
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a first interdigitated structure, including first and second sets of interdigitated conductive sheets defining a first resonant cavity therebetween having a least a first radiating aperture; a second interdigitated structure, including third and fourth sets of interdigitated conductive sheets defining a second resonant cavity therebetween, having at least a second radiating aperture; said first and second interdigitated structures being relatively disposed in a stacked manner, said first and second apertures being orthogonally disposed with respect to each other; and means for applying a first signal at a predetermined frequency to said first interdigitated structure and a second signal at said predetermined frequency to said second interdigitated structure, said second signal being 90°
out of phase with said first signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification