Antenna coupler for testing mobile telephones

• US 6,229,490 B1
• Filed: 07/28/1998
• Issued: 05/08/2001
• Est. Priority Date: 07/29/1997
• Status: Expired due to Term

• Current Assignee: Aeroflex Ltd (Lumentum Holdings Inc.)
• Original Assignee: Wavetek GmbH
• Inventors: Hofmann, Andreas
• Primary Examiner(s): Ho, Tan
• Application Number:
  US09/123,731
• Time in Patent Office: 1,015 Days
• Field of Search: 343/702, 343/703, 343/906, 343/767, 343/793, 343/795, 455/89, 455/90
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• CPC Class Codes: H01Q 13/08 Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
• CPC Class Codes: H01Q 13/10 Resonant slot antennas
• 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 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence
• CPC Class Codes: H04B 1/3877 Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters

Abstract

In an antenna coupler (100) for testing mobile telephones (10), simple structure, which has a low coupling attenuation, is provided in that the antenna coupler (100) has the following features: a printed circuit board (1), on the upper side of which there is formed by a strip transmission line technique at least one antenna element (7,8); and a receiving element for a mobile telephone (10) secured to the upper side of the printed circuit board (1).

Claims

1. Antenna coupler (100) for testing a mobile telephone (1), wherein said antenna coupler (100) comprises:

a printed circuit board (1), upon the upper side of which there is formed at least one antenna element (7,8); and

an accommodating element for the mobile telephone (10), secured above said printed circuit board (1).

2. Antenna coupler (100) according to claim 1, wherein said antenna element (7,8) is a slot antenna (7) or a dipole antenna (8).

3. Antenna coupler (100) according to claim 2, wherein a supply line to the antenna element (7, 8) is formed on the underside of said printed circuit board (1).

4. Antenna coupler (100) according to claim 3, wherein said supply line has an impedance converter (51,52).

5. Antenna coupler (100) according to claim 1, wherein said printed circuit board (1) comprises a first and a second antenna element (7,8), said first antenna element (7) being provided for a first frequency range, and said second antenna element (8) for a second frequency range.

6. Antenna coupler (100) according to claim 5, wherein said first frequency range is 880-960 MHz and said second frequency range is 1710-1990 MHz.

7. Antenna coupler (100) according to claim 6, wherein said first antenna element (8) is a dipole antenna, and said second antenna element (7) is a slot antenna.

8. The antenna coupler (100) according to claim 5, wherein said first and second antenna elements (7, 8) are disposed substantially orthogonally to one another on the upper side of said printed circuit board (1).

9. The antenna coupler (100) according to claim 5, wherein said first antenna element (7) is disposed substantially orthogonally to an antenna (12) of said mobile telephone (10), and is disposed substantially centrally to a body (11) of said mobile telephone (10).

10. The antenna coupler (100) according to claim 5, wherein said second antenna element (8) is disposed substantially parallel and substantially underneath an antenna (12) of said mobile telephone (10), on the upper side of said printed circuit board (1).

11. The antenna coupler (100) according to claim 5, wherein both said antenna elements (7, 8) are combined via a diplexer (50) to a single connection (49) to a test device.

12. The antenna coupler (100) according to claim 11, wherein said diplexer (50) is formed on the underside of said printed circuit board (1).

13. The antenna coupler (100) according to claim 12, wherein said diplexer (50) has a first impedance converter (51), and a second impedance converter (52) for adapting the impedances of said first and second antenna elements (7, 8) to the impedance of the connection (49).

14. The antenna coupler (100) according to claim 13, wherein said first impedance converter (51) for the frequency range of said second antenna element (8) has an infinite impedance, and wherein said second impedance converter (52) for the frequency range of said first antenna element (7) has an infinite impedance.

15. The antenna coupler (100) according to claim 14, wherein said upper side of said printed circuit board (1) consists substantially of conductive material, which is grounded.

16. The antenna coupler (100) according to claim 14, wherein said underside of said printed circuit board (1) is surrounded by a screened housing (20).

17. The antenna coupler (100) according to claim 16, wherein said accommodating element for said mobile telephone (10) is a mobile universal holder (23) made of a non-metallic material.

18. Antenna coupler (100) for testing a mobile telephone (10), wherein said antenna coupler (100) comprises:

a printed circuit board (1), upon the upper side of which there is formed first and second antenna elements (7, 8), said first antenna element (7) being provided for a first frequency range, and said second antenna element (8) for a second frequency range, both said antenna elements (7, 8) being combined via a diplexer (50) to a single connection (49) to a test device, said diplexer (50) being formed on the underside of said printed circuit board (1) and having a first impedance converter (51), and a second impedance converter (52) for adapting the impedances of said first and second antenna elements (7, 8) to the impedance of the connection (49); and

an accommodating element for the mobile telephone (10), secured above said printed circuit board (1).

19. Antenna coupler (100) for testing a mobile telephone (10), wherein said antenna coupler (100) comprises:

a printed circuit board (1), upon the upper side of which there is formed first and second antenna elements (7, 8), said first antenna element (7) being a dipole provided for a first frequency range of 880-960 MHZ, and said second antenna element (8) being a slot antenna for a second frequency range of 1710-1990 MHZ, both said antenna elements (7, 8) being combined via a diplexer (50) to a single connection (49) to a test device, said diplexer (50) being formed on the underside of said printed circuit board (1) and having a first impedance converter (51) and a second impedance converter (52) for adapting the impedances of said first and second antenna elements (7, 8) to the impedance of the connection (49), said first impedance converter (51) for the frequency range of said second antenna element (8) and said second impedance converter (52) for the frequency range of said first antenna element (7) both having an infinite impedance; and

an accommodating element for the mobile telephone (10), secured above said printed circuit board (1).