Radio frequency connection arrangement

Patent metadata

Field	Value
Publication number	US-10211504-B2
Application number	US-201715828886-A
Country	US
Kind code	B2
Filing date	Dec 1, 2017
Priority date	Feb 13, 2015
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

A radio frequency transmission arrangement comprises a ground plate having an aperture comprising a slot with an elongate cross-section and substantially parallel sides, and a first and second transmission line. The thickness of the ground plate is greater than a width of the slot. The first transmission line comprises a first elongate conductor on a first side of the ground plate and has an end terminated with a first termination stub. The second transmission line comprises a second elongate conductor on the opposite side of the ground plate and has an end terminated with a second termination stub. The first transmission line is arranged to cross the slot at a point adjacent to the first termination stub, and the second transmission line is arranged to cross the slot at a point adjacent to the second termination stub.

First claim

What is claimed is:

1. A radio frequency transmission arrangement configured to provide a transmission path from a first transmission line on a first side of a ground plate to a second transmission line on a second side of the ground plate, opposite to the first side,
wherein the ground plate has an aperture passing through the ground plate from the first side to the second side, the aperture comprising a slot, the slot having an elongate cross-section in a plane of the first side of the ground plate, the cross-section having substantially parallel sides extending along a length of the cross section, and the slot having a width which is a distance between the parallel sides of the cross-section of the slot, a thickness of the ground plate being greater than the width of the slot,
wherein the first and second transmission lines are unbalanced transmission lines referenced to the ground plate and arranged to cross the slot, and
wherein the first transmission line is formed by a printed track on a dielectric film, disposed with an air gap between the dielectric film and the ground plate.

2. The radio frequency transmission arrangement of claim 1 , wherein the aperture is an air-filled cavity.

3. The radio frequency transmission arrangement of claim 1 , wherein the ground plate is composed of a non-conductive moulding having an electrically conductive coating.

4. The radio frequency transmission arrangement of claim 3 , wherein the non-conductive moulding comprises a plastic material and the conductive coating comprises copper.

5. The radio frequency transmission arrangement of claim 1 , wherein the ground plate is composed of metal.

6. The radio frequency transmission arrangement of claim 5 , wherein the metal is composed of cast aluminium.

7. The radio frequency transmission arrangement of claim 1 , wherein the thickness of the ground plate is greater than four times the width of the slot.

8. The radio frequency transmission arrangement of claim 1 , wherein the width of the slot is greater than 1 mm and the thickness of the ground plate is greater than 5 mm.

9. The radio frequency transmission arrangement of claim 1 , wherein the width of the slot is in the range 1 to 3 mm and the thickness of the ground plate is in the range 5 to 15 mm.

10. The radio frequency transmission arrangement of claim 1 , wherein the aperture comprises a termination cavity at each end of the slot.

11. The radio frequency transmission arrangement of claim 10 , wherein each termination cavity is cylindrical.

12. The radio frequency transmission arrangement of claim 11 , wherein each cylindrical terminating cavity has a diameter of substantially 0.1 of a wavelength at an operating frequency of the radio frequency transmission structure.

13. The radio frequency transmission arrangement of claim 1 , wherein the length of the slot is less than a wavelength at an operating frequency of the radio frequency transmission arrangement.

14. The radio frequency transmission arrangement of claim 13 , wherein the the length of the slot is less than 0.3 of the wavelength at the operating frequency of the radio frequency transmission arrangement.

15. The radio frequency transmission arrangement of claim 1 , wherein the dielectric film is a polyester film.

Assignees

• Cambium Networks Ltd

Inventors

• Strong Peter
• Wilkins Adam
• Morrell Carl
• Clark Paul
• King Nigel Jonathan Richard

Classifications

• H05K1/0239

  Signal transmission by AC coupling · CPC title

• H05K1/0225

  Single or multiple openings in a shielding, ground or power plane (H05K1/0227 takes precedence) · CPC title

• H05K1/02

  Details · CPC title

• H01P5/028 Primary

  between strip lines · CPC title

• H01P5/00 Primary

  Coupling devices of the waveguide type · CPC title