Built-in, multi band, multi antenna system

• US 20040137950A1
• Filed: 01/14/2004
• Published: 07/15/2004
• Est. Priority Date: 03/23/2001
• Status: Abandoned Application

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Nordenstrom, Peter, Andersson, Johan, Ying, Zhinong, Bolin, Thomas, Da Silva Frazao, Andre
• Application Number:
  US10/472,996
• Publication Number:
  US 20040137950A1
• Time in Patent Office: Days
• US Class Current: 455/562.1
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 19/005 Patch antenna using one or more coplanar parasitic elements
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
• CPC Class Codes: H01Q 9/0414 in a stacked or folded configuration
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A build-in, multi band, multi antenna system (1) for a protable communicaiton device (10) has a first antenna (2, 4, 5), which is resonant in first an second frequency band. A secon antenna (3) is resonant in a fourth frequency bank. The first antenna, the papasitic element and the second antenna are provided on a common flexible substrate.

Claims

1. A built-in, multi band, multi antenna system (1) for a portable communication device (10), comprising, in combination:

a first antenna (2, 4, 5), which is resonant in first and second frequency bands,

a parasitic element (6), which is positioned adjacent to the first antenna and is resonant in a third frequency band, and

a second antenna (3), which is resonant in a fourth frequency band,

wherein the first antenna, the parasitic element and the second antenna are provided on a common flexible substrate.

2. An antenna system as in claim 1, wherein the first antenna (2, 4, 5) and the second antenna (3) are PIFA antennas.

3. An antenna system as in claim 2, wherein

the first antenna (2, 4, 5) has a first feed trace (7b) and a first ground trace (7a),

the parasitic element (6) has a second ground trace (7c), and

the second antenna (3) has a second feed trace (7e) and a third ground trace (7d).

4. An antenna system as in claim 3, wherein

the first antenna (2, 4, 5) has a GSM part (4) and a DCS part (5),

the parasitic element (6) is operative in the PCS band, and

the second antenna (3) is a Bluetooth™

antenna.

5. An antenna system as in any preceding claim, wherein the parasitic element (6) is located between the first antenna (2, 4, 5) and the second antenna (3) so as to provide high impedance blocking between the antennas.

6. An antenna system as in any preceding claim, further comprising an antenna carrier (9), upon which said common flexible substrate is provided in a folded distribution.

7. A portable communication device (10) having a printed circuit board (13), characterized by

an antenna system (1) according to any of claims 1-6, and

an antenna connector (11) for connecting the antenna system to the printed circuit board (13).

8. A portable communication device as in claim 7, the antenna system (1) being defined by claim 3, wherein the antenna connector (11) comprises a group of five pogo pins (12), each of which is aligned with a respective one of said first feed trace (7b), said first ground trace (7a), said second ground trace (7c), said second feed trace (7e) and said third ground trace (7d).

9. A portable communication device as in claim 7 or 8, wherein the device is a mobile telephone.