Meta-structure antenna array
Examples disclosed herein relate to methods and apparatuses for an antenna structure having reactance control of an array of radiating elements to achieve radiation beam tilting.
1. An antenna structure, comprising:
a substrate forming a waveguide structure having a plurality of layers, comprising;
a first dielectric layer;
a second dielectric layer;
a slotted conductive layer positioned between the first and second layers; and
an array of radiating elements positioned proximate the second layer,
wherein the waveguide structure is configured for propagating electromagnetic waves along the waveguide structure; and
a beam-tilting means coupled to the array of radiating elements, adapted to control a reactance of the array of radiating elements so as to correspond to a plurality of dielectric materials of varying dielectric constants.
2. The antenna structure as in claim 1 , wherein the array of radiating elements comprises a plurality of sections corresponding to a plurality of equivalent dielectrics so as to introduce a different phase shift in the electromagnetic waves.
3. The antenna structure as in claim 2 , wherein the beam-tilting means causes the antenna structure to generate a resultant radiation beam tilted from the normal.
4. The antenna structure as in claim 2 , wherein the plurality of sections has a pattern of repeating equivalent dielectrics.
5. The antenna structure as in claim 1 , wherein the radiating elements are metamaterial unit cells or meta-structure unit cells.
6. The antenna structure as in claim 1 , wherein the waveguide structure is a Substrate Integrated Waveguide (SIW).
7. The antenna structure as in claim 1 , wherein the first dielectric layer forms a portion of the waveguide structure having a plurality of transmission paths for propagation of a transmission signal comprising the electromagnetic waves.
8. The antenna structure as in claim 7 , wherein the slotted conductive layer has slots configured along each of the plurality of transmission paths corresponding to the plurality of radiating elements.
9. The radiating structure as in claim 7 , wherein the plurality of transmission paths are coupled to a power distribution structure.
10. The radiating structure as in claim 9 , wherein the beam-tilting means is configured in the power distribution structure as a reactance control module.
11. An antenna structure, comprising:
a waveguide structure comprising two dielectric layers;
a slotted conductive layer disposed between the two dielectric layers;
an array of radiating elements positioned proximate one of the two dielectric layers, the array of radiating elements configured for generating a radiation beam, wherein the waveguide structure is configured for propagating electromagnetic waves of the radiation beam along the waveguide structure; and
a plurality of dielectric sections coupled to the array of radiating elements, the plurality of dielectric sections configured to cause a phase shift in the radiation beam.
12. The antenna structure as in claim 11 , wherein the plurality of dielectric sections comprises one or more dielectric materials with each dielectric material having a different dielectric constant.
13. The antenna structure as in claim 11 , wherein the plurality of dielectric sections enables the antenna structure to generate a resultant radiation beam tilted from a direction of the radiation beam.
14. The antenna structure as in claim 11 , wherein one of the two dielectric layers forms a portion of the waveguide structure having a plurality of transmission paths for propagation of a transmission signal comprising the electromagnetic waves of the radiation beam.
15. The antenna structure as in claim 14 , wherein the slotted conductive layer has slots configured along each of the plurality of transmission paths corresponding to the plurality of radiating elements.
16. The antenna structure as in claim 14 , wherein the plurality of transmission paths are coupled to a power distribution structure and the plurality of dielectric sections is configured in the power distribution structure as a reactance control module.
17. A method of operating an antenna structure, comprising:
providing a transmission signal to the antenna structure;
propagating the transmission signal along a waveguide structure of the antenna structure and via a dielectric layer of the waveguide structure into a plurality of dielectric sections;
tilting, via the plurality of dielectric sections, a radiated energy at different angles; and
radiating, via a plurality of radiating elements, a beam of radiation based on the tilted radiated energy.
18. The method of claim 17 , wherein the plurality of dielectric sections comprises one or more dielectric materials with each dielectric material having a different dielectric constant.
19. The method of claim 17 , wherein the array of radiating elements comprises a plurality of equivalent dielectrics that introduces a phase shift in the beam of radiation.
20. The method of claim 17 , wherein the dielectric layer forms a portion of the waveguide structure having a plurality of transmission paths that enables a propagation of the transmission signal and wherein the slotted conductive layer has slots configured along each of the plurality of transmission paths corresponding to the plurality of radiating elements.