US 11,990,681 B2
Phase diversity input for an array of traveling-wave antennas
Michael Boyarsky, Durham, NC (US); Seyedmohammadreza Faghih Imani, Tempe, AZ (US); and David R. Smith, Durham, NC (US)
Assigned to Duke University, Durham, NC (US)
Filed by DUKE UNIVERSITY, Durham, NC (US)
Filed on May 2, 2023, as Appl. No. 18/142,408.
Application 18/142,408 is a continuation of application No. 17/102,310, filed on Nov. 23, 2020, granted, now 11,670,867.
Claims priority of provisional application 62/938,703, filed on Nov. 21, 2019.
Prior Publication US 2023/0352849 A1, Nov. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01Q 21/00 (2006.01); H01Q 13/20 (2006.01)
CPC H01Q 21/0037 (2013.01) [H01Q 13/20 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a traveling-wave antenna array comprising a plurality of adjacent metamaterial surface antennas comprising a waveguide or a cavity, each adjacent metamaterial surface antenna comprising an array of metamaterial radiators coupled to a surface of the waveguide or the cavity, each metamaterial radiator comprising an individually addressable tunable component that can be tuned over a spectral bandwidth to generate different radiation patterns; and
a phase diversity feed coupled to the traveling-wave antenna array and configured to provide adjustable phase diverse input to two or more of the plurality of adjacent metamaterial surface antennas, the phase diverse input comprising a first phase for a first traveling-wave antenna and a second phase for a second traveling-wave antenna, the first phase being different from the second phase, wherein the phase diverse input is selected to suppress grating lobes for a directed beam pattern selected for transmission.