Broadband non-Foster decoupling networks for superdirective antenna arrays
AssigneeHRL Laboratories, LLC
InventorsJonathan J. Lynch, Carson R. White
Life of this patent
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Abstract
A four port antenna decoupling network which has only two negative capacitors and four or more positive capacitors and a method of improving low frequency receiving performance of two element and four element antenna arrays using one or more wideband decoupling circuits wherein each of said wideband decoupling circuits contain a maximum of two non-Foster components, the two non-Foster components preferably simulating negative capacitors.
Claims18
A four port antenna decoupling network which has only two negative capacitors and four or more positive capacitors.
A four port antenna decoupling network having:
- a. first and second ports coupled, in use, either directly to antenna elements or indirectly to antenna elements;
- b. third and fourth ports coupled, in use, either directly or indirectly to radio transmitting and/or receiving apparatus;
- c. the first and second ports each having first connection points and second connection points, the first connection points of the first and second ports being directly connected to each other, the second connection points of the first and second ports being connected to each other via at least a pair of positive capacitors, the pair of positive capacitors having a common junction point between them;
- d. the third port having first connection points and second connection points, the first connection point of the third port being capacitively coupled to a first one of said pair of positive capacitors with a first negative capacitor and the second connection point of the third port being directly coupled to a second one of said pair of positive capacitors;
- e. the fourth port having first connection points and second connection points, the first connection point of the fourth port being directly coupled to the first connection points of the first and second ports, and the second connection point of the fourth port being coupled to (i) the first connection point of the fourth port and (ii) the common junction point between the pair of positive capacitors via a network of three capacitors one of which is a negative capacitor.
A method of improving radio frequency receiving performance of two element and four element antenna arrays using one or more wideband decoupling circuits wherein each of said wideband decoupling circuits contain a maximum of two non-Foster components.
An eight port antenna decoupling network comprising four four-port couplers arranged in a configuration providing four ports four coupling to antenna elements and another four ports for coupling to receiving and/or transmitting apparatus, where at least two of the four-port couplers each have two negative capacitors and four or more positive capacitors.
A four port antenna decoupling and impedance matching network comprising a plurality of reactance elements arranged in a circuit configuration and wherein each of the plurality reactance elements of said circuit configuration are either capacitors or non-Foster circuits synthesizing negative capacitors.
A four port antenna decoupling network comprising:
- two negative capacitors and four or more positive capacitors, wherein the two negative capacitors and the four or more positive capacitors are coupled together in a circuit configuration having four ports.
A method of improving the performance of two element and four element antenna arrays using one or more wideband decoupling circuits having a bandwidth at least an octave wide and wherein each of said wideband decoupling circuits contain a maximum of two non-Foster components.
Dependencies are inferred from the claim text.