Monopole/L-shaped parasitic elements for circularly/elliptically polarized wave transceiving
First Claim
1. An antenna structure capable of radiating and receiving circularly polarized electromagnetic waves comprising means for transceiving a first linearly-polarized radiated field, a plurality of L-shaped conductive elements disposed about said transceiving means, each L-shaped conductive element having an arm spaced from and extending substantially parallel to a ground plane and positioned orthogonal to the first linearly-polarized radiated field, each L-shaped conductive element being positioned to receive the field from the transceiving means and to reradiate a second linearly-polaized radiated field normal to said first field and in phase quadrature with said first field to afford in combination with each other a circularly polarized radiation pattern.
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Abstract
The subject invention relates to antennas having substantially greater bandwidth and low angle gain of the type for the transceiving of circularly/elliptically polarized electromagnetic waves. The antenna structure comprises a ground plane, a source of linearly-polarized wave energy field associated with said ground plane, and a plurality of conductive elements having an L-shape, said elements equally spaced from one another and equiangularly disposed about the sources, said plurality of elements being in a form of a circular arrangements, each element being so disposed as to fall on the circumference of the circular arrangement, each element lying in a common plane orthogonal to the linearly-polarized wave energy field provided by said source. The subject invention has special utility in motor and marine craft for communication and navigation.
117 Citations
24 Claims
- 1. An antenna structure capable of radiating and receiving circularly polarized electromagnetic waves comprising means for transceiving a first linearly-polarized radiated field, a plurality of L-shaped conductive elements disposed about said transceiving means, each L-shaped conductive element having an arm spaced from and extending substantially parallel to a ground plane and positioned orthogonal to the first linearly-polarized radiated field, each L-shaped conductive element being positioned to receive the field from the transceiving means and to reradiate a second linearly-polaized radiated field normal to said first field and in phase quadrature with said first field to afford in combination with each other a circularly polarized radiation pattern.
- 8. An antenna structure comprising a ground plane, a source of linear polarized electromagnetic waves situated adjacent said ground plane, and a plurality of L-shaped antenna elements spaced from and positioned to receive said electromagnetic waves from said source, one arm of each L-shaped antenna element being connected to said ground plane and the other arm of each L-shaped antenna element being equiangularly disposed about said source and positioned normal to the linear polarized electromagnetic waves.
- 10. An antenna structure comprising a monopole antenna, a ground plane disposed orthogonally to said monopole antenna, a plurality of elements having two interconnected arms, with their first arms being connected at their free ends to the ground plane and their second arms having their free ends disposed above the ground plane and parallel thereto, said second free ends extending in a uniform direction and equiangularly disposed from the monopole.
- 15. An antenna structure comprising a ground plane, a source of a linearly-polarized wave energy field situated adjacent said ground plane, and a plurality of parasitic elements equally spaced from one another and equiangularly disposed about said source, said plurality of parasitic elements being in a form of a circular arrangement, each parasitic element being so disposed as to fall on the circumference of the circular arrangement, each parasitic element having a portion lying in a common plane orthogonal to the linearly-polarized wave energy field provided by said source to generate a second linearly-polarized wave component orthogonal to the linearly polarized wave energy provided by said source.
Specification