US 11,855,364 B2
Microwave transformer and a system for fabricating the same
Juha Lilja, Tampere (FI)
Assigned to StealthCase Oy, Tampere (FI)
Appl. No. 17/605,492
Filed by StealthCase Oy, Tampere (FI)
PCT Filed Mar. 16, 2020, PCT No. PCT/FI2020/050163
§ 371(c)(1), (2) Date Oct. 21, 2021,
PCT Pub. No. WO2020/221955, PCT Pub. Date Nov. 5, 2020.
Claims priority of application No. 20195349 (FI), filed on Apr. 29, 2019.
Prior Publication US 2022/0209410 A1, Jun. 30, 2022
Int. Cl. H01Q 7/00 (2006.01); H01Q 1/22 (2006.01); H01Q 13/10 (2006.01); H01Q 1/00 (2006.01); H01Q 15/00 (2006.01)
CPC H01Q 7/00 (2013.01) [H01Q 1/22 (2013.01); H01Q 1/00 (2013.01); H01Q 13/10 (2013.01); H01Q 13/103 (2013.01); H01Q 15/0013 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A conductive layer comprising a microwave transformer for receiving and re-emitting a microwave signal and an aggregated component for said microwave signal, wherein said conductive layer being configured to re-emit said microwave signal through said conductive layer with a scaled intensity, wherein said scaled intensity being scaled by a scaling factor, wherein:
said scaling being arranged by expanding the coverage beam of said re-emitted microwave signal with said microwave transformer, and
said microwave signal being a signal of a first frequency, said aggregated component being a signal of a second frequency, and said first and second frequencies being configurable by two inter-band carriers of a wireless communication system, said scaling factor being less than 0.25, and
said transformer comprising a first physical area delimited with a closed curve on the conductive layer for receiving said microwave signal from a first space angle and re-emitting a ray of said microwave signal to a second space angle, and said first physical area having at least one region with electrically conductive material and at least one region without electrically conductive material, wherein said at least one region without electrically conductive material being connected to coupled microwave resonators, wherein said resonators being sensitive at least to a first polarization and provided on a repeating sequence as multiple replicas of a unit image along a primary processing direction, and wherein said unit image comprises
1. a first set of resonators forming an array of first resonant nodes, wherein said first resonant nodes having a standing wave node within said first physical area, and wherein the resonators of said first set being coupled by coherent segments of surface currents in said conductive layer, wherein the direction of said coherent current segments being arranged in a direction of a first distance, and said first distance being configured to separate at least two sets of substantially parallel and uninterrupted paths within regions without electrically conductive material, comprised by said at least one region without electrically conductive material, wherein said uninterrupted paths being separated by said first distance, and said uninterrupted paths having an uninterrupted length of at least 20 times said first distance, wherein said uninterrupted paths comprising regions of mirrored symmetry with respect to a symmetry reference of a symmetry axis, or regions of rotational symmetry with respect to a symmetry reference of a rotation point, and
2. a second set of resonators forming an array of second resonant nodes, wherein said second resonant nodes having a standing wave node within said first physical area, and the second set of resonators being configured to isolate the array of the second resonant nodes from the array of the first resonant nodes in spatial domain, frequency domain, or in polarization domain;
wherein said first physical area has a first dimension and a second dimension, and a first effective area for said re-emitted ray, wherein the first effective area at the first frequency being arranged with said first set of resonators, and wherein the ratio of said first effective area to said first physical area being arranged larger than the scaling factor by offsetting said second resonant nodes and the first resonant nodes in the direction of the first dimension and wherein said coverage expansion being provided with an arrangement where the ratio of the first dimension to the second dimension being smaller than twice the scaling factor.