LOW FREQUENCY DUAL-ANTENNA DIVERSITY SYSTEM

• US 20110298669A1
• Filed: 06/09/2010
• Published: 12/08/2011
• Est. Priority Date: 06/08/2010
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Research In Motion Limited (Blackberry Limited)
• Inventors: RAO, QINJIANG, WANG, DONG
• Granted Patent: US 8,350,764 B2
• Time in Patent Office: Days
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 1/521 reducing the coupling between adjacent antennas
• CPC Class Codes: H01Q 11/14 with parts bent, folded, shaped or screened or with phasing impedances, to obtain desired phase relation of radiation from selected sections of the antenna or to obtain desired polarisation effect H01Q11/20 takes precedence
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A dual-antenna diversity antenna system that operates within a low frequency band range is disclosed. Two antennas are folded separately onto a single three dimensional dielectric substrate in a meander pattern configuration. Each antenna has an independent feed port and ground pin. The two antennas are configured within a compact mobile terminal to produce high isolation and low correlation at resonating frequencies within the 700 Megahertz frequency band.

Claims

1. A mobile communications device comprising:

dual-antennas, each antenna comprising a plurality of conductive strip segments electrically connected together and configured in a meander pattern;

wherein said first antenna of said dual-antennas is disposed at a first corner of a single three-dimensional dielectric substrate and comprises a first feed port and a first ground pin;

wherein a second antenna of said dual-antennas is disposed at a second corner of said single three-dimensional dielectric substrate that is opposite the first corner and comprises a second feed port and a second ground pin; and

wherein said second antenna is configured in a meander pattern that is the same as said first antenna.

2. The mobile communications device of claim 1, wherein said first antenna and said second antenna are oriented at a ninety degree angle with respect to each other.

3. The mobile communications device of claim 1, wherein said first antenna and said second antenna are arranged in a balanced configuration with respect to each other.

4. The mobile communications device of claim 3, wherein said first antenna and said second antenna are disposed onto said three-dimensional dielectric substrate in a mirror symmetry arrangement with respect to each other.

5. The mobile communications device of claim 1, wherein said first antenna comprises said first feed port and said first ground pin;

and said second antenna comprises said second feed port and said second ground pin.

6. The mobile communications device of claim 1, wherein each antenna is one of a planar inverted F antenna and an inverted F antenna.

7. The mobile communications device of claim 1, wherein said first antenna is operational as a transceiver and said second antenna is operational as a receiver.

8. The mobile communications device of claim 1, wherein a distance between said first antenna and said second antenna is at least 30 millimeters.

9. The mobile communications device of claim 1, further comprising:

a housing; and

a ground plane opposite to the plane of said three-dimensional dielectric substrate.

10. The mobile communications device of claim 1, wherein said three-dimensional dielectric substrate is polygonal in configuration.

11. The mobile communications device of claim 1, wherein said dual-antennas radiate at a same time within a range of frequencies in a 700 Megahertz frequency band.

12. An antenna arrangement for a mobile communication device, comprising:

dual-antennas, each antenna comprising a plurality of conductive strip segments electrically connected together and configured into a meander pattern,

wherein a first antenna of said dual-antennas is disposed at a first corner of a single three-dimensional dielectric substrate;

wherein a second antenna of said dual-antennas includes conductive strip segments configured in said meander pattern that is identical to said first antenna and is disposed at a second corner of the single planar dielectric substrate that is opposite the first corner;

and wherein said first antenna and said second antenna comprises a separate feed port and a separate ground pin.

13. The antenna arrangement of claim 12, wherein said first antenna and said second antenna are disposed onto said dielectric substrate with mirror symmetry with respect to each other.

14. The antenna arrangement of claim 12, wherein said first antenna and said second antenna are oriented at a ninety degree angle with respect to each other.

15. The antenna arrangement of claim 12, wherein said three-dimensional dielectric substrate is polygonal in configuration.

16. The antenna arrangement of claim 12, wherein said dual-antennas radiate at a same time within a range of frequencies in a 700 Megahertz frequency band.