Traveling-wave loop antenna based on metal ring cavity for generating radio frequency orbital angular momentum
US9705200B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2014 |
| Grant date | Jul 11, 2017 |
| Priority date | — |
| Expiry date | Sep 12, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q13/22
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A traveling-wave loop antenna based on a metal ring cavity for generating a radio frequency OAM beam includes a main structure which is the metal ring cavity whose top surface has an annular slot circumferentially opened. Two openings, ¼ of a perimeter of the metal ring cavity apart, are two excitation source ports of the antenna, for connecting a metal waveguide. When the two ports are inputted with microwave sources having the same frequency and a phase difference of ±90°, an electromagnetic field in the metal ring cavity exhibits a traveling-wave distribution propagating circumferentially clockwise or counterclockwise. The annular slot constitutes the antenna. A reasonable design of a size of the metal ring cavity and a position of the annular slot realizes a conversion from a microwave guided-wave mode to an OAM mode and a generation of the radio frequency OAM beams with different orders l in free space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.