US 12,308,517 B2
Periodic mode-selective structure for surface wave scattering mitigation in millimeter wave antenna arrays
Abhijit Bhattacharya, Burnaby (CA); Robert Hill, Richmond (CA); and Min-Yu Huang, Richmond (CA)
Assigned to Swiftlink Technologies Inc., Richmond (CA)
Filed by Swiftlink Technologies Co., Ltd., Suzhou (CN); and Swiftlink Technologies Inc., Richmond (CA)
Filed on Feb. 10, 2022, as Appl. No. 17/669,102.
Prior Publication US 2023/0253702 A1, Aug. 10, 2023
Int. Cl. H01Q 1/52 (2006.01); H01Q 1/48 (2006.01); H01Q 21/06 (2006.01)
CPC H01Q 1/52 (2013.01) [H01Q 1/48 (2013.01); H01Q 21/061 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A structure which reduces surface wave propagation on a printed circuit board (PCB), the structure comprising:
a plurality of concentric rings to enclose an antenna array that is associated with an operating frequency and is fixed on the PCB, each of the plurality of concentric rings including
a vertical portion that runs continuously along each of the plurality of concentric rings and that is attached to a ground plane of the PCB through a substrate of the PCB, and
a planar strip attached to the vertical portion at an end that is opposite of the ground plane, wherein a height of the vertical portion and half a width of the planar strip have a combined length that is a quarter of a wavelength of the operating frequency that is associated with the antenna array, and wherein a first of the plurality of concentric rings comprises a first planar strip that is centered on a first vertical portion of the first of the plurality of concentric rings and a second of the plurality of concentric rings comprises a second planar strip that is off-centered on a second vertical portion of the second of the plurality of concentric rings, and wherein the plurality of concentric rings alternate between being centered and being off-centered as the plurality of concentric rings progress away from the antenna array.