Circular-polarization two-way antenna
First Claim
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1. A circular polarization antenna (for left-hand or right-hand polarizations) antenna characterised by:
- a ground plane (2);
a wire loop (1) above a ground plane (2) and having a closed path whose perimeter is equal or approximately equal to a wavelength at the operating frequency and through which all transmission and reception of said antenna occur;
an excitation device of the wire (1);
discrimination means to determine the sense of the circular polarization; and
means for supporting the wire (1);
wherein said antenna has a high gain or sensitivity along an axis normal to the plane of said wire loop and a reduced off-axis sensitivity.
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Abstract
An antenna for transmitting and receiving circularly polarized electromagnetic radiation which is configurable to either right-hand or left-had circular polarization. The antenna has a conductive plane and a closed conductive loop spaced from the plane. A signal transmission line is electrically coupled to the loop at a first point and a probe is electrically coupled to the loop at a spaced-apart second point.
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Citations
13 Claims
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1. A circular polarization antenna (for left-hand or right-hand polarizations) antenna characterised by:
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a ground plane (2); a wire loop (1) above a ground plane (2) and having a closed path whose perimeter is equal or approximately equal to a wavelength at the operating frequency and through which all transmission and reception of said antenna occur; an excitation device of the wire (1); discrimination means to determine the sense of the circular polarization; and means for supporting the wire (1); wherein said antenna has a high gain or sensitivity along an axis normal to the plane of said wire loop and a reduced off-axis sensitivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An antenna for transmitting and receiving circularly polarized electromagnetic radiation which is configurable to either right-hand circular polarization or left-hand circular polarization, comprising:
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a conductive plane; a closed conductive loop spaced from said plane by one-twentieth of one wavelength of said electromagnetic radiation and having a perimeter approximately equal to one wavelength of said electromagnetic radiation; a signal transmission line for carrying all transmission signals to said closed conductive loop and for carrying all reception signals from said closed conductive loop, electrically coupled to said closed conductive loop at a first point on said loop; a probe means electrically coupled to said closed conductive loop at a second point spaced from said first point for determining which of said right and left-hand polarizations said antenna is configured for; wherein said antenna transmits and receives signals primarily from zenith angles which are perpendicular to a plane of said closed conductive loop; whereby a directional, efficient transmission occurs with said compact antenna. - View Dependent Claims (12, 13)
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Specification