Metamaterial-based direction-finding antenna systems
First Claim
1. A method to determine arrival direction of an electromagnetic signal having a signal frequency and a signal wavelength, comprising the steps of:
- with an antenna configured to define, at said signal frequency, at least one metamaterial cell between first and second signal ports, rotating said antenna until a differential power that is defined as the difference between received powers from said first and second ports is substantially zero; and
determining said arrival direction as a normal to said metamaterial cell.
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Abstract
Method embodiments are disclosed to determine arrival directions of electromagnetic signals that have a known signal frequency and a known guided signal wavelength. These methods are realized with an antenna configured to define, at the signal frequency, at least one metamaterial cell between first and second signal ports. They then include the step of rotating the antenna until the differential power from the first and second signal ports is substantially zero and then determining the arrival direction as a normal to the metamaterial cell. In other method embodiments, the antenna is stationary and a differential power is determined wherein the differential power is defined as the difference between received powers from the first and second ports. The arrival direction of electromagnetic signals are then determined from the differential power.
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Citations
17 Claims
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1. A method to determine arrival direction of an electromagnetic signal having a signal frequency and a signal wavelength, comprising the steps of:
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with an antenna configured to define, at said signal frequency, at least one metamaterial cell between first and second signal ports, rotating said antenna until a differential power that is defined as the difference between received powers from said first and second ports is substantially zero; and determining said arrival direction as a normal to said metamaterial cell. - View Dependent Claims (2, 3, 4, 5)
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6. A method to determine arrival direction of an electromagnetic signal having a signal frequency and a signal wavelength, comprising the steps of:
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with an antenna configured to define, at said signal frequency, at least one metamaterial cell between first and second signal ports, noting a differential power that is defined as the difference between received powers from said first and second ports; and determining said arrival direction from said differential power. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method to use an antenna to determine arrival direction of an electromagnetic signal having a signal frequency and a signal wavelength, comprising the steps of:
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arranging an antenna to define, at said signal frequency, at least one metamaterial cell between first and second signal ports to thereby note a differential power that is the difference between received powers from said first and second ports; and with said antenna, determining said arrival direction from said differential power. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification