US 12,261,345 B2
Radio frequency device providing a transition unit for coupling a hollow waveguide to a differential pair transmission line having overlapping open loops
Arshad Mehmood, Darmstadt (DE); and Alexander Gäbler, Darmstadt (DE)
Assigned to BEIJING BOE SENSOR TECHNOLOGY CO., LTD., Beijing (CN)
Filed by BEIJING BOE SENSOR TECHNOLOGY CO., LTD., Beijing (CN)
Filed on Jul. 13, 2022, as Appl. No. 17/812,188.
Claims priority of application No. 21185885 (EP), filed on Jul. 15, 2021.
Prior Publication US 2023/0015885 A1, Jan. 19, 2023
Int. Cl. H01P 5/107 (2006.01); H01P 3/08 (2006.01)
CPC H01P 5/107 (2013.01) [H01P 3/08 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A radio frequency device (1), comprising:
a substrate layer arrangement (3) with a planar differential pair transmission line (7) arranged on one or more surfaces (10, 11) of at least one substrate layer (4, 5) of the substrate layer arrangement (3); and
a transition unit (2) providing a transition between the planar differential pair transmission line (7) and a hollow radio frequency waveguide (15), comprising
an end section (12) of the planar differential pair transmission line (7) that is configured as a radio frequency signal transition pattern (13),
an end section (14) of the waveguide (15) for radio frequency electromagnetic waves that is attached to the substrate layer arrangement (3) and that superposes the radio frequency signal transition pattern (13),
wherein the end section (14) of the waveguide (15) is directed perpendicular to the one or more surfaces (10, 11) of the substrate layer arrangement (3) with the planar differential pair transmission line (7),
wherein an open end (17) of the end section (14) of the waveguide (15) is attached to a first outer surface (16) or a second outer surface (19) of the substrate layer arrangement (3),
wherein the end section (12) of the planar differential pair transmission line (7) comprises
a first end section (24) of a first transmission line segment (8) and
a second end section (25) of a second transmission line segment (9) are arranged towards each other at a distance in a direction perpendicular to the one or more surfaces (10, 11) of the substrate layer arrangement (3), and
wherein the first end section (24) of the first transmission line segment (8) overlaps the second end section (25) of the second transmission line segment (9) across an overlapping section to form a capacitive coupling of the first and second end section (24, 25) that enhances an inductive coupling between the radio frequency electromagnetic wave within the waveguide (15) and the end section (12) of the planar differential pair transmission line (7),
wherein the first and second end sections (24, 25) of the first and second transmission line segments (8, 9) each form an open loop,
wherein both the open loops of the first and second transmission line segments overlap each other to form the transition pattern (13).