Antennas for computers with conductive chassis

Patent metadata

Field	Value
Publication number	US-9882264-B2
Application number	US-201414290535-A
Country	US
Kind code	B2
Filing date	May 29, 2014
Priority date	Sep 30, 2011
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

According to one general aspect, a computing device may include a conductive frame and a slot antenna formed, at least in part, by the conductive frame. The slot antenna defines a cavity that extends into the conductive frame from an opening on the conductive frame to a closed end defined by an internal portion of the conductive frame. The slot antenna includes a feed point disposed at a position along the slot antenna such that the slot antenna forms an open-circuited portion and a short-circuited portion, and the feed point is disposed between the open-circuited portion and the short-circuited portion. The computing device may also include a coupling element configured to be excited by an electrical signal via the feed point.

First claim

What is claimed is:

1. A computing device, comprising:
a conductive frame;
a first slot antenna formed, at least in part, by the conductive frame, the first slot antenna defining a first cavity that extends into the conductive frame from a first open end on the conductive frame to a closed end of the first slot antenna;
a second slot antenna formed, at least in part, by the conductive frame, the second slot antenna defining a second cavity that extends into the conductive frame from a second open end on the conductive frame to a closed end of the second slot antenna,
wherein the second slot antenna is formed a distance away from the first slot antenna,
wherein the first slot antenna includes a feed point, the feed point dividing the first slot antenna into a short-circuited portion and an open-circuited portion, the open-circuited portion including an un-closed loop, the short-circuited portion being positioned substantially around an outside perimeter of the un-closed loop, the short-circuited portion and the open-circuited portion being separated by a frame portion of the conductive frame, wherein a width of the frame portion controls one or more resonance frequencies in the first slot antenna.

2. The computing device of claim 1 , wherein the short-circuited portion is substantially C-shaped around the outside perimeter of the un-closed loop.

3. The computing device of claim 1 , wherein the open-circuited portion is configured to create a first resonance frequency in the first slot antenna, and the closed-circuited portion is configured to create a second resonance frequency in the first slot antenna, the first resonance frequency being lower than the second resonance frequency, wherein the frame portion is configured to create additional resonance frequencies in the first slot antenna.

4. The computing device of claim 3 , wherein the additional resonance frequencies increase a bandwidth or frequency range at which the first slot antenna radiates.

5. The computing device of claim 1 , wherein the second slot antenna includes a feed point, the feed point of the second slot antenna dividing the second slot antenna into an open-circuited portion and a short-circuited portion, the short-circuited portion of the second slot antenna and the open-circuited portion of the second slot antenna being separated by another frame portion of the conductive frame.

6. The computing device of claim 1 , wherein the cavity of the first slot antenna is configured in a spiral-shape.

7. A computing device comprising:
a conductive chassis;
a slot antenna formed, at least in part, by the conductive chassis, the slot antenna defining a cavity that extends into the conductive chassis from an open end on the conductive chassis to a closed end defined by an internal portion of the conductive chassis,
the conductive chassis including an electrically isolated portion extending on a first side of the slot antenna and a ground portion extending on a second side of the slot antenna such that the electrically isolated portion and the ground portion are separated by the slot antenna, the electrically isolated portion configured to be excited such that a first resonance frequency is created within the slot antenna; and
a coupling element capacitively coupled to the slot antenna, the coupling element being separated from the slot antenna by a non-conductor separator, the non-conductor separator preventing a direct electrical coupling between the coupling element and the slot antenna, the coupling element including a first end portion and a second end portion, the first end portion of the coupling element having a grounding point, the second end portion of the coupling element having a feed point, the grounding point of the coupling element being coupled to the ground portion of the conductive chassis, wherein a distance between the grounding point of the coupling element and the feed point of the coupling element controls a second resonance frequency of the slot antenna.

8. The computing device of claim 7 , wherein the electrically isolated portion has a length corresponding to a length of the cavity.

9. The computing device of claim 7 , wherein the second side of the slot antenna is parallel with the first side of the slot antenna.

Assignees

• Google Inc
• Google Llc

Inventors

• Gummalla Ajay Chandra Venkata

Classifications

• H01Q1/42

  Housings not intimately mechanically associated with radiating elements, e.g. radome · CPC title

• G06F1/1698

  the I/O peripheral being a sending/receiving arrangement to establish a cordless communication link, e.g. radio or infrared link, integrated cellular phone (details of antennas disposed inside a computer H01Q1/2266) · CPC title

• G06F1/1656 Primary

  Details related to functional adaptations of the enclosure, e.g. to provide protection against EMI, shock, water, or to host detachable peripherals like a mouse or removable expansions units like PCMCIA cards, or to provide access to internal components for maintenance or to removable storage supports like CDs or DVDs, or to mechanically mount accessories (mounting of accessories to a computer display G06F1/1607; display hoods G06F1/1603; cooling arrangements for portable computers G06F1/203) · CPC title

• H01Q1/44

  using equipment having another main function to serve additionally as an antenna {, e.g. means for giving an antenna an aesthetic aspect}(H01Q1/27 - H01Q1/34 take precedence) · CPC title

• H01Q5/30

  Arrangements for providing operation on different wavebands · CPC title