# US 2019/0173524 A1 · Apparatus and methods for launching electromagnetic waves having a certain electric field structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173524 A1 - Document ID: US20190173524A1 - Status: Published application - Kind: A1 - Application number: 16/266,255 - Filed: 2019-02-04 - Published: 2019-06-06 - Earliest claimed: 2016-12-08 - Assignees: AT&T Intellectual Property I, L.P. - Applicants: AT&T Intellectual Property I, L.P. - Inventors: Giovanni Vannucci; Peter Wolniansky; Paul Shala Henry; Robert Bennett; Farhad Barzegar; Irwin Gerszberg; Donald J. Barnickel; Thomas M. Willis, III - Web page: https://patentgrep.com/patent/US20190173524A1 ## CPC - H04B 3/52: Systems for transmission between fixed stations via waveguides - H01P 1/182: {Waveguide phase-shifters (H01P1/181, H01P1/185, H01P1/19 take precedence)} - H01P 3/10: Wire waveguides, i.e. with a single solid longitudinal conductor - H01Q 15/242: {Polarisation converters} - H04B 3/28: Reducing interference caused by currents induced in cable sheathing or armouring - H04B 3/56: Circuits for coupling, blocking, or by-passing of signals - H04B 3/58: Repeater circuits - H04B 2203/5441: Wireless systems or telephone - H04B 2203/5483: using coupling circuits - H04B: TRANSMISSION - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract Aspects of the subject disclosure may include, receiving a signal, and launching, according to the signal, an electromagnetic wave along a transmission medium, where the electromagnetic wave propagates along the transmission medium without requiring an electrical return path, and where the electromagnetic wave has a phase delay profile that is dependent on an azimuth angle about an axis of the transmission medium. Other embodiments are disclosed. ## Claims ### Claim 1 A device, comprising: a structure coupled to a transmission medium, wherein an electromagnetic wave propagating along the transmission medium is received at a first side of the structure, wherein the structure facilitates adjusting the electromagnetic wave to generate at a second side of the structure an adjusted electromagnetic wave that propagates along the transmission medium away from the structure, wherein the adjusted electromagnetic wave has an electric field intensity that is lower near an outer surface of the transmission medium than at an outer radial region that is further from the outer surface of the transmission medium, and wherein the electromagnetic wave and the adjusted electromagnetic wave propagate along the transmission medium without requiring an electrical return path. ### Claim 2 (depends on 1) The device of claim 1, wherein the structure comprises a spiral structure. ### Claim 3 (depends on 2) The device of claim 2, wherein the spiral structure comprises a dielectric spiral structure. ### Claim 4 (depends on 1) The device of claim 1, wherein the structure comprises a diffraction grating structure. ### Claim 5 (depends on 1) The device of claim 1, further comprising a receiver that facilitates receiving from the first side of the structure a second electromagnetic wave generated from a third electromagnetic wave entering the second side of the structure, wherein the third electromagnetic wave substantially has a phase delay profile that is dependent on an azimuth angle around an axis of the structure, and wherein the structure substantially removes the phase delay profile of the third electromagnetic wave to generate the second electromagnetic wave. ### Claim 6 (depends on 1) The device of claim 1, wherein the adjusted electromagnetic wave has a helical wavefront configuration. ### Claim 7 (depends on 1) The device of claim 1, wherein the electric field intensity comprises a first field intensity of the adjusted electromagnetic wave that is at or near the outer surface of the transmission medium and a second field intensity of the adjusted electromagnetic wave that is more radially distant from the outer surface of the transmission medium, and wherein the first field intensity is lower than the second field intensity. ### Claim 8 (depends on 1) The device of claim 1, further comprising a cover to contain, for a longitudinal portion of the transmission medium, the adjusted electromagnetic wave as the adjusted electromagnetic wave propagates away from the structure. ### Claim 9 A method, comprising: adjusting, by a structure, a wavefront configuration of an electromagnetic wave to generate an adjusted wavefront configuration of the electromagnetic wave that propagates along a transmission medium away from the structure, wherein the adjusted wavefront configuration has an electric field intensity of lower intensity near an outer surface of the transmission medium than at an outer radial region that is further from the outer surface of the transmission medium, wherein the electromagnetic wave propagates along a transmission medium without requiring an electrical return path. ### Claim 10 (depends on 9) The method of claim 9, wherein the structure comprises a spiral device coupled to the transmission medium. ### Claim 11 (depends on 9) The method of claim 9, wherein an ingress portion of the structure from which the electromagnetic wave enters the structure is tapered towards the outer surface of the transmission medium to reduce reflections as the electromagnetic wave enters the ingress portion of the structure. ### Claim 12 (depends on 9) The method of claim 9, wherein an egress portion of the structure from which the adjusted wavefront configuration of the electromagnetic wave exits the structure is tapered towards the outer surface of the transmission medium to reduce radiation losses in the adjusted wavefront configuration as the adjusted wavefront configuration exits the egress portion of the structure. ### Claim 13 (depends on 9) The method of claim 9, further comprising launching, by a transmitter, the electromagnetic wave having the wavefront configuration. ### Claim 14 (depends on 9) The method of claim 9, wherein the electric field intensity of the adjusted wavefront configuration increases in a radial direction away from the outer surface of the transmission medium. ### Claim 15 (depends on 9) The method of claim 9, wherein the electric field intensity of the adjusted wavefront configuration decreases in a radial direction towards the outer surface of the transmission medium. ### Claim 16 (depends on 9) The method of claim 9, wherein the adjusted wavefront configuration is helical. ### Claim 17 A device, comprising: means for generating an electromagnetic wave; and means for adjusting the electromagnetic wave to generate an adjusted electromagnetic wave that propagates along a transmission medium, wherein the adjusted electromagnetic wave has an electric field intensity that is lower near an outer surface of the transmission medium than at an outer radial region that is further from the outer surface of the transmission medium, and wherein the electromagnetic wave and the adjusted electromagnetic wave propagate along the transmission medium without requiring an electrical return path. ### Claim 18 (depends on 17) The device of claim 17, wherein the electric field intensity of the adjusted electromagnetic wave increases radially away from the outer surface of the transmission medium. ### Claim 19 (depends on 17) The device of claim 17, wherein the electric field intensity of the adjusted electromagnetic wave decreases radially towards the outer surface of the transmission medium. ### Claim 20 (depends on 17) The device of claim 17, wherein the means for adjusting generates a plurality of electromagnetic waves phase-shifted from each other to generate the adjusted electromagnetic wave.