Embedded antennas structures for wireless communications and radar
Various antennas elements including antennas arrays can support various communication technologies and can be integrated into different components or subcomponents of a vehicle, including various vehicle light assemblies. The vehicular antennas elements include low profile and/or concealed antenna elements that are inconspicuous aesthetically and do not affect or substantially affect vehicle aerodynamics.
1 . A retro-directive antenna array system for wireless communications comprising:
an antenna array comprising one or more antenna elements;
a negative refractive-index engineered material (NIM) deposited over at least one of the one or more antenna elements; and
a controller configured to control a switch configured to connect the one or more antenna elements to a transmission path and to a reception path,
wherein the NIM has a tunable surface configured to be adjusted by the controller via application of a stimulus into a negative refraction mode when the one or more antenna elements are connected to the reception path and to be adjusted into a positive refraction mode when the one or more antenna elements are connected to the transmission path.
2 . The retro-directive antenna array system of claim 1 , wherein the antenna array does not include a harmonic or subharmonic mixer to conjugate phases of signals received by the retro-directive antenna array system with signals to be transmitted from the retro-directive antenna array system.
3 . The retro-directive antenna array system of claim 1 , wherein the NIM is deposited over at least one of the one or more antenna elements so that signal received by the retro-directive antenna array system passes through the NIM prior to being received by the antenna array.
4 . The retro-directive antenna array system of claim 1 , wherein the antenna array comprises a dual-polarized antenna with a first polarity in a reception direction for signals received by the retro-directive antenna array system and a second polarity in a transmission direction for signals transmitted from the retro-directive antenna array system, wherein the first polarity and the second polarity are different.
5 . The retro-directive antenna array system for wireless communications of claim 1 , wherein the NIM has a permittivity of about −1 and a permeability of about −1.
6 . The retro-directive antenna array system for wireless communications of claim 1 , further comprising a retro-directive antenna array circuitry operatively coupled to the antenna array.
7 . The retro-directive antenna array system for wireless communications of claim 6 , wherein the antenna array does not include phase conjugation circuitry configured to conjugate to perform phase conjugation of signals received by the retro-directive antenna array system.
8 . The retro-directive antenna array system for wireless communications of claim 1 , wherein the antenna array does not include a frequency mixer to conjugate phases of signals received by the retro-directive antenna array system with signals to be transmitted from the retro-directive antenna array system.
9 . The retro-directive antenna array system for wireless communications of claim 1 , wherein the NIM negatively refracts signals and provides the negatively refracted signals to the antenna array.
10 . The retro-directive antenna array system for wireless communications of claim 1 , wherein for a signal hitting the NIM at a first angle of θ degrees, the first angle is defined with respect to an axis in a direction orthogonal to a surface of the NIM, the NIM is configured to invert a received angle of the signal to be about −θ degrees as the signal passes through the NIM.
11 . The retro-directive antenna array system for wireless communications of claim 1 , wherein the antenna array includes a first subset of antenna elements for reception and a second subset of antenna elements for transmission, wherein the NIM is deposited over the first subset of antenna elements.
12 . The retro-directive antenna array system for wireless communications of claim 11 , wherein the NIM is deposited only over the first subset of antenna elements and not over the second subset of antenna elements.
13 . The retro-directive antenna array system for wireless communications of claim 1 , wherein the NIM is aligned with the antenna array so that only signals received by the retro-directive antenna array system are negatively refracted by the NIM.
14 . The retro-directive antenna array system for wireless communications of claim 13 , wherein only phases of the signals received by the retro-directive antenna array system are reversed and phases of the signals transmitted from the retro-directive antenna array system remain are not reversed.
15 . The retro-directive antenna array system for wireless communications of claim 1 , wherein the stimulus is at least one of an electric stimulus or a magnetic stimulus.
16 . The retro-directive antenna array system of claim 1 , further comprising:
a second negative refractive-index engineered material deposited over at least a second one of the one or more antenna elements,
wherein the NIM is a first negative refractive-index engineered material, and
wherein the first negative refractive-index engineered material and the second negative refractive-index engineered material have substantially different refraction properties.
17 . The retro-directive antenna array system of claim 1 , further comprising:
a second negative refractive-index engineered material deposited over a second one of the one or more antenna elements; and
a signal distribution network configured to distribute signals between the one or more antenna elements,
wherein the NIM is a first negative refractive-index engineered material,
wherein the first negative refractive-index engineered material and the second negative refractive-index engineered material have substantially similar adjustable refraction properties, and
wherein the signal distribution network comprises an equi-phase transmission line configured to match a signal phase between the at least one of the one or more antenna elements and the second one of the one or more antenna elements.
18 . The retro-directive antenna array system of claim 17 , wherein the equi-phase transmission line comprises an electrically length matched line.
19 . A retro-directive antenna array system for wireless communications comprising:
an antenna array comprising one or more antenna elements;
a negative refractive-index engineered material (NIM) deposited over at least one of the one or more antenna elements; and
a controller configured to control a switch that is configured to connect the one or more antenna elements to a transmission path and to a reception path,
wherein the antenna elements comprise a dual-polarized antenna with a first polarity in a reception direction for signals received by the retro-directive antenna array system and a second polarity in a transmission direction for signals transmitted from the retro-directive antenna array system, wherein the first polarity and the second polarity are different, and wherein the NIM has a tunable surface configured to be adjusted, via application of a stimulus, into a negative refraction mode when a current polarity of the dual-polarized antenna is in the reception direction and to be adjusted into a positive refraction mode when the when the current polarity of the dual-polarized antenna in the transmission direction.
20 . The retro-directive antenna array system of claim 1 , wherein the tunable surface is configured to phase conjugate a received signal when in the negative refraction mode.