Patent ID: 9413049
Filing Date: 2016-08-09
CPC Classification: H01P,H01R

Claim Text:
1. A rotary joint comprising: a first part; and a second part that rotates relative to the first part about an axis of rotation; wherein the first part has a first electrical connection annular portion; wherein the second part has a second electrical connection annular portion; wherein the first and second electrical connection annular portions make contactless electrical connection with one another; wherein the electrical connection annular portions together define and surround a core region, wherein an electrical connection between the first and second electrical connection annular portions is not made through the core region; wherein the core region includes the axis of rotation; wherein the first electrical connection annular portion includes: wherein the second electrical connection annular portion includes: wherein the first and second annular waveguide structures define respective first and second annular gaps within the corresponding annular waveguide structures, and an axial gap therebetween; wherein first feed is operatively coupled to the first annular waveguide structure to produce a transverse electromagnetic (TEM) wave that propagates from the annular gap of the first annular waveguide structure, across the axial gap, to the annular gap of the second annular waveguide structure wherein the first and second feeds each include transmission lines that are between a pair of ground planes; wherein the transmission lines include fingers that span a gap in one of the pair of ground planes; and wherein the TEM wave is produced in the gap in the one of the pair of ground planes.