STRUCTURAL SLOT ANTENNA WITH ISOLATING ELEMENT

• US 20200136261A1
• Filed: 10/26/2018
• Published: 04/30/2020
• Est. Priority Date: 10/26/2018
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Inventors: JAIN, Sidharath, MORRIS, Toby James, HARPER, Marc
• Granted Patent: US 10,978,807 B2
• Time in Patent Office: Days
• CPC Class Codes: H01Q 1/2266 disposed inside the computer
• CPC Class Codes: H01Q 1/521 reducing the coupling between adjacent antennas
• CPC Class Codes: H01Q 13/10 Resonant slot antennas
• CPC Class Codes: H01Q 13/103 with variable reactance for tuning the antenna tuning resonant circuits H03J
• CPC Class Codes: H01Q 13/12 Longitudinally slotted cylinder antennas; Equivalent structures
• CPC Class Codes: H01Q 21/064 using horn or slot aerials slotted waveguides arrays H01Q21/005
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H04B 7/0413 MIMO systems

Abstract

The disclosed technology provides an antenna structure located in the metal casing of a computing device. A first open slot radiating structure radiates at a radiating wavelength and is located on a surface of the metal casing of the computing device. A second open slot radiating structure radiates at the radiating wavelength and is located on the surface of the metal casing of the computing device. At least one closed slot radiator element is located between the first open slot radiating structure and the second open slot radiating structure on the surface of the metal casing of the computing device. The closed slot radiator element is approximately half the length of the radiating wavelength.

Claims

1. An antenna structure located on a metal casing of a computing device, the antenna structure comprising:

a first open slot radiating structure radiating at a radiating wavelength and located on a surface of the metal casing of the computing device;

a second open slot radiating structure radiating at the radiating wavelength and located on the surface of the metal casing of the computing device; and

at least one closed slot radiator element located between the first open slot radiating structure and the second open slot radiating structure on the surface of the metal casing of the computing device, the closed slot radiator element being approximately half the length of the radiating wavelength and being located such that the closed slot radiator element radiates electric surface currents flowing along the metal casing of the computing device.

2. The antenna structure of claim 1, wherein the at least one closed slot radiator element acts as a closed slot isolator element, radiating surface current flowing between the first open slot radiating structure and the second open slot radiating structure and reducing coupling between the first open slot radiating structure and the second open slot radiating structure.

3. The antenna structure of claim 1, wherein the at least one closed slot radiator element acts as a second band radiator element, where the at least one closed slot radiator element is electrically connected to the first open slot radiating structure and the at least one closed slot radiator element radiates at approximately half of a radiating wavelength of the first open slot radiating structure.

4. The antenna structure of claim 1, wherein the antenna structure forms a multiple-input multiple-output (MIMO) antenna structure.

5. The antenna structure of claim 1, wherein the first open slot radiating structure is capacitively driven by a first radiating structure and the second open slot radiating structure is capacitively driven by a second radiating structure.

6. The antenna structure of claim 1, wherein the surface of the metal casing of the computing device is an edge surface of the metal casing of the computing device.

7. The antenna structure of claim 1, wherein the first open slot radiating structure is electrically driven using a first coaxial cable and the second open slot radiating structure is electrically driven using a second coaxial cable.

8. The antenna structure of claim 1, wherein the first open slot radiating structure, the second open slot radiating structure, and the at least one closed slot radiator are filled with a dielectric material.

9. An electronic device comprising:

a metal casing;

a first open slot radiating structure radiating at a radiating wavelength and located on a surface of the metal casing of the electronic device;

a second open slot radiating structure radiating at the radiating wavelength and located on the surface of the metal casing of the computing device; and

at least one closed slot radiator element located between the first open slot radiating structure and the second open slot radiating structure on the surface of the metal casing of the computing device, the closed slot radiator element being approximately half the length of the radiating wavelength and being located such that the closed slot radiator element radiates electric surface currents flowing along the metal casing of the computing device.

10. The electronic device of claim 9, wherein the at least one closed slot radiator element acts as a closed slot isolator element, radiating surface current flowing between the first open slot radiating structure and the second open slot radiating structure and reducing coupling between the first open slot radiating structure and the second open slot radiating structure.

11. The electronic device of claim 9, wherein the at least one closed slot radiator element acts as a second band radiator element, where the at least one closed slot radiator element is electrically connected to the first open slot radiating structure and the at least one closed slot radiator element radiates at approximately half of a radiating wavelength of the first open slot radiating structure.

12. The electronic device of claim 9, wherein the first open slot radiating structure is capacitively driven by a first radiating structure and the second open slot radiating structure is capacitively driven by a second radiating structure.

13. The electronic device of claim 9, wherein the first open slot radiating structure, the second open slot radiating structure, and the closed slot radiator element are formed on an edge surface of the metal casing of the electronic device.

14. The electronic device of claim 9, wherein the first open slot radiating structure is electrically driven using a first coaxial cable and the second open slot radiating structure is electrically driven using a second coaxial cable.

15. A method of isolating a first open slot radiating structure on a surface of a metal casing of an electronic device from a second open slot radiating structure on the surface of the metal casing of the electronic device, the method comprising:

providing at least one closed slot radiator element located between the first open slot radiating structure and the second open slot radiating structure on the surface of the metal casing of the electronic device, the at least one closed slot radiator element being approximately half the length of the radiating wavelength and being located such that the closed slot radiator element radiates electric surface currents flowing along the metal casing of the computing device.

exciting the first open slot radiating structure, causing the first open slot radiating structure to radiate at a radiating wavelength; and

exciting the second open slot radiating structure, causing the second open slot radiating structure to radiate at the radiating wavelength.

16. The method of claim 15, wherein the first open slot radiating structure is excited directly by a first coaxial cable connected to a first radio frequency source and the second open slot radiating structure is excited directly by a second coaxial cable connected to a second radio frequency source.

17. The method of claim 15, wherein the first open slot radiating structure is excited by capacitively coupling a first radiating structure to the first open slot radiating structure, the first radiating structure being fed by a first radio frequency source.

18. The method of claim 15, wherein the second open slot radiating structure is excited by capacitively coupling a second radiating structure to the second open slot radiating structure, the second radiating structure being fed by a second radio frequency source.

19. The method of claim 15, wherein the surface of the metal casing of the electronic device is an edge surface of the metal casing of the electronic device.

20. The method of claim 15, wherein providing at least one closed slot radiator element located between the first open slot radiating structure and the second open slot radiating structure on the surface of the metal casing of the electronic device includes providing a first closed slot radiator element and a second closed slot radiator element.