Antenna array with amplitude tapering and method therefor
Examples disclosed herein relate to systems and methods for configuring and operating an antenna system. In accordance with various embodiments, the disclosed system and methods utilize amplitude tapering of an antenna array to reduce side lobe levels while optimizing main lobe gain. An antenna array is configured to increase a gain differential by reducing side lobe amplitude. The array of radiating elements is arranged to have a majority of elements at the center of the array with fewer elements on the edges.
1. A method for configuring an antenna system, comprising:
setting a set of beam parameters for a main array and at least one edge array portion, wherein the main array comprises a first plurality of radiating elements configured to generate a non-tapered beam having a main lobe and side lobes, and wherein the at least one edge array portion comprises a second plurality of radiating elements arranged at a corner of the main array and configured to taper the beam from the main array;
determining a first configuration of the main array to achieve a main lobe gain;
determining a first weight for feed to the first plurality of radiating elements;
determining a second weight for feed to the second plurality of radiating elements;
determining a gain differential of the main lobe and the side lobes;
determining a second configuration of the at least one edge array to achieve the gain differential of main lobe and the side lobes;
determining whether further configuration adjustments of the at least one edge array are needed; and
storing the first and second weights in a configuration for the antenna system.
2. The method of claim 1 , prior to determining the gain differential, the method further comprising:
determining a further weight for feed to the second plurality of radiating elements.
3. The method of claim 1 , after determining the gain differential, the method further comprising:
determining a further weight for feed to the second plurality of radiating elements.
4. The method of claim 1 , wherein the first and second plurality of radiating elements have different arrangements.
5. The method of claim 1 , wherein the antenna system further comprises a feed distribution network, wherein the feed distribution network has a first set of transmission lines coupled to the first plurality of radiating elements and a second set of transmission lines coupled to the second plurality of radiating elements.
6. The method of claim 5 , wherein the antenna system further comprises a gain control module configured to apply control weights to the first and second sets of transmission lines respectively coupled to the first and second plurality of radiating elements.
7. The method of claim 1 , wherein the second plurality of radiating elements of the at least one edge array portion form a rectangular gap at the corner of the main array.
8. The method of claim 1 , wherein the at least one edge array portion forms a triangular gap at the corner of the main array.
9. The method of claim 1 , wherein the at least one edge array portion forms a rectangular gap at the corner of the main array.