Multi-beam active phased array architecture with independent polarization control
In an exemplary embodiment, a phased array antenna comprises multiple subcircuits in communication with multiple radiating elements. The radio frequency signals are independently adjusted for both polarization control and beam steering. In a receive embodiment, multiple RF signals of various polarizations are received and combined into at least one receive beam output. In a transmit embodiment, at least one transmit beam input is divided and transmitted through multiple radiating elements, with the transmitted beams having various polarizations. In an exemplary embodiment, the phased array antenna provides multi-beam formation over multiple operating frequency bands. The wideband nature of the active components allows for operation over multiple frequency bands simultaneously.
1. A phased array circuit comprising:
a first beam forming network;
a first dual-polarized radiating element;
a second dual-polarized radiating element;
a first polarization control circuit coupled to the first dual-polarized radiating element;
a second polarization control circuit coupled to the second dual-polarized radiating element;
a first phase shifter coupled between the first polarization control circuit and the first beam forming network for phase shifting a first composite signal communicated between the first polarization control circuit and the first beam forming network; and
a second phase shifter coupled between the second polarization control circuit and the first beam forming network for phase shifting a second composite signal communicated between the second polarization control circuit and the first beam forming network, wherein the first beam forming network is configured to convert between: (1) a first beam signal; and (2) the first composite signal and the second composite signal.
2. The phased array circuit of claim 1 , wherein the first dual-polarized radiating element comprises a first port and a second port each in communication with the first polarization control circuit; and wherein the second dual-polarized radiating element comprises a third port and a fourth port each in communication with the second polarization control circuit.
3. The phased array circuit of claim 2 ,
wherein the first polarization control circuit is configured to adjust a first portion of the first composite signal communicated between the first phase shifter and the first port of the first dual-polarized radiating element by adjusting each of a first in-phase vector and a first quadrature-phase vector of the first portion; and
wherein the second polarization control circuit is configured to adjust a second portion of the second composite signal communicated between the second phase shifter and the third port of the second dual-polarized radiating element by adjusting each of a second in-phase vector and quadrature-vector of the second portion.
4. The phased array circuit of claim 3 , wherein the first and second polarization control circuits of the phased array circuit adjust phase and amplitude of the first portion and the second portion, respectively.
5. The phased array circuit of claim 2 , wherein the first port of the first dual-polarized radiating element is spatially orthogonal to the second port of the first dual-polarized radiating element.
6. The phased array circuit of claim 2 , wherein the first dual-polarized radiating element has one of: linear polarizations, circular polarizations, and elliptical polarizations.
7. The phased array circuit of claim 1 , wherein the first polarization control circuit is configured to control the polarization of the first composite signal, and wherein the second polarization control circuit is configured to control the polarization of the second composite signal.
8. The phased array circuit of claim 1 , wherein the first beam forming network is configured to independently steer the first beam signal relative to any other beams associated with the first and second dual-polarized radiating elements.
9. The phased array circuit of claim 1 , wherein the first polarization control circuit is configured to switch the polarization of the first the first dual-polarized radiating element, and wherein the second polarization control circuit is configured to switch the polarization of the second dual-polarized radiating element.
10. The phased array circuit of claim 1 , further comprising a digital control device to communicate commands to the phased array circuit.
11. The phased array circuit of claim 10 , wherein the first and second polarization control circuits are configured to control the polarization of the first and second dual-polarized radiating elements, respectively, based on the commands to the phased array circuit.
12. The phased array circuit of claim 1 , wherein the phased array circuit is an integrated circuit.
13. The phased array circuit of claim 1 , further comprising:
a third phase shifter coupled to the first beam forming network;
a first combiner/divider circuit coupled between the first polarization control circuit and the first and third phase shifters, the first combiner/divider circuit for converting between the first composite signal and a first plurality of beam element signals, wherein the first phase shifter is configured to phase shift a first beam element signal of the first plurality of beam element signals, and wherein the third phase shifter is configured to phase shift a third beam element signal of the first plurality of beam element signals;
a second beam forming network;
a fourth phase shifter coupled to the second beam forming network; and
a second combiner/divider circuit coupled between the second polarization control circuit and the second and fourth phase shifters, the first combiner/divider circuit for converting between the second composite signal and a second plurality of beam element signals, wherein the second phase shifter is configured to phase shift a second beam element signal of the second plurality of beam element signals, and wherein the fourth phase shifter is configured to phase shift a fourth beam element signal of the second plurality of beam element signals;
wherein the first beam forming network is configured to convert between: (1) the first beam signal; and (2) the first and second beam element signals; and
wherein the second beam forming network is configured to convert between: (1) a second beam signal; and (2) the third and fourth beam element signals.
14. The phased array circuit of claim 13 , wherein the first beam forming network is configured to independently steer the first beam signal relative to the second beam signal of the second beam forming network.