BROADBAND CAPACITIVELY-LOADED TUNABLE ANTENNA

• US 20150091766A1
• Filed: 09/27/2013
• Published: 04/02/2015
• Est. Priority Date: 09/27/2013
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: ALI, Shirook M., WANG, Dong
• Granted Patent: US 9,537,217 B2
• Time in Patent Office: Days
• US Class Current: 343/750
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 5/314 using frequency dependent circuits or components, e.g. trap circuits or capacitors
• CPC Class Codes: H01Q 5/392 the parasitic elements having dual-band or multi-band characteristics

Abstract

A broadband capacitively-loaded tunable antenna, and device there for is provided. The device comprises: an antenna feed; a first radiating arm connected to the antenna feed; a second radiating arm capacitively coupled to the first radiating arm; an adjustable reactance device connecting the second radiating arm to one or more of a ground and a third radiating arm; and, a processor in communication with the adjustable reactance device, the processor configured to adjust a reactance of the adjustable reactance device to tune a resonance frequency of a combination of the second radiating arm, the adjustable reactance device, and, when present, the third radiating arm.

Claims

1. A device comprising:

an antenna feed;

a first radiating arm connected to the antenna feed;

a second radiating arm capacitively coupled to the first radiating arm;

an adjustable reactance device connecting the second radiating arm to one or more of a ground and a third radiating arm; and

,

a processor in communication with the adjustable reactance device, the processor configured to adjust a reactance of the adjustable reactance device to tune a resonance frequency of a combination of the second radiating arm, the adjustable reactance device, and, when present, the third radiating arm.

2. The device of claim 1, wherein the adjustable reactance device is adjustable using one or more of:

a bias voltage, a direct current bias voltage, at least one switch, and/or at least one microelectromechanical system (MEMS) device.

3. The device of claim 1, wherein the adjustable reactance device comprises a passive tunable integrated circuit.

4. The device of claim 3, wherein the processor is further configured to adjust the reactance of the adjustable reactance device by adjusting a bias voltage to the passive tunable integrated circuit.

5. The device of claim 3, further comprising the bias voltage device and a connection between the bias voltage device and the adjustable reactance device, the processor further configured to adjust the reactance of the adjustable reactance device by adjusting an output voltage of the bias voltage device.

6. The device of claim 3, wherein the processor is further configured to adjust the reactance of the adjustable reactance device by adjusting a capacitance of the passive tunable integrated circuit.

7. The device of claim 1, wherein the first radiating arm is configured to resonate in a first frequency range from about 1700 MHz to about 2100 MHz.

8. The device of claim 1, wherein the combination of the second radiating arm, the adjustable reactance device and, when present, the third radiating arm is configured to resonate in a first frequency range from about 740 MHz to about 960 MHz, wherein a position of resonance is tunable based on a reactance of the adjustable reactance device.

9. The device of claim 1, further comprising a fourth radiating arm connected to the antenna feed, the fourth radiating arm configured to resonate at a frequency different from the first radiating arm and the combination of the second radiating arm, the adjustable reactance device and, when present, the third radiating arm.

10. The device of claim 9, wherein the fourth radiating arm is configured to resonate in a first frequency range from about 2500 MHz to about 2700 MHz.

11. The device of claim 1, wherein the adjustable reactance device couples the second radiating arm to the third radiating arm, and the second radiating arm is connected to a ground at an end opposite the adjustable reactance device.

12. The device of claim 11, further comprising at least a fourth radiating arm and at least a second adjustable reactance device connecting the third radiating arm to the fourth radiating arm, the processor further configured to adjust a respective reactance of the second adjustable reactance device to tune a respective resonance frequency of a combination of the second radiating arm, the adjustable reactance device, the third radiating arm, the second adjustable reactance device and the fourth radiating arm.

13. The device of claim 11, wherein one or more of the second radiating arm and the third radiating arm comprises a three-dimensional structure incorporated onto on internal structure the device.

14. The device of claim 1, further comprising a matching circuit connecting the antenna feed to the first radiating arm.