Antenna in a wireless system

• US 7,414,587 B2
• Filed: 09/25/2006
• Issued: 08/19/2008
• Est. Priority Date: 09/25/2006
• Status: Active Grant

• Current Assignee: Shure Acquisition Holdings Inc. (Shure Incorporated)
• Original Assignee: Shure Acquisition Holdings Inc. (Shure Incorporated)
• Inventors: Stanton, Kevin Patrick
• Primary Examiner(s): Nguyen; Hoang V
• Application Number:
  US11/534,802
• Publication Number:
  US 20080074331A1
• Time in Patent Office: 694 Days
• Field of Search: 343/702, 343/866, 343/741, 343/700.MS, 343/846, 343/749
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/2291 used in bluetooth or WI-FI devices of Wireless Local Area Networks [WLAN] H01Q1/241 takes precedence; WLAN in general H04W
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 9/36 with top loading
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface

Abstract

The present invention provides apparatuses and methods for an antenna in a wireless receiving system. The antenna includes an opened segmented component that is electrically coupled to a printed circuit board and a capacitive top loaded component that provides a capacitive load. The vertical profile of the antenna may be reduced sufficiently so that the antenna may be internally located in the same enclosure as the printed circuit board. The capacitive top loaded component is situated away from a ground plane of a printed circuit board to reduce the capacitive coupling is reduced, and consequently the required voltage standing wave ration (VSWR) is maintained over a broad operating range. The capacitive top loaded component includes a closed shape that provides a capacitive load. In order to tune the antenna to operate with a desired characteristic (e.g., within a VSWR criterion), the closed shape may be modified.

Claims

1. An antenna for supporting a wireless receiving system, comprising:

an open segmented component providing a received signal to a printed circuit board at a first end point, the antenna being connected to the printed circuit board only at the first end point; and

a capacitive top loaded component having a closed segmented shape that is;

electrically coupled to the open segmented component at a second end point;

provides a capacitive load for the antenna, the capacitive load tuning the antenna for an operating frequency value; and

situated away from a ground plane of the printed circuit board at an angle formed by the open segmented component and the capacitive top loaded component at the second end point,

wherein the antenna is internally located within a same enclosure as the printed circuit board that supports the wireless receiving system.

2. The antenna of claim 1, wherein the closed segmented shape is formed by an electrical wire along a periphery, the electrical wire being joined at the second end point of the open segmented component.

3. The antenna of claim 1, wherein the open segmented component has an essentially vertical orientation with respect to the printed circuit board.

4. The antenna of claim 1, wherein the capacitive top loaded component has an essentially horizontal orientation with respect to the printed circuit board.

5. The antenna of claim 1, wherein the open segmented component has a bend that angles the capacitive top loaded component away from the printed circuit board.

6. The antenna of claim 1, wherein the wireless receiving system comprises a wireless microphone receiver.

7. The antenna of claim 1, wherein the wireless receiving system comprises a wireless a personal monitor receiver.

8. The antenna of claim 1, wherein the wireless receiving system supports a wireless presentation system.

9. The antenna of claim 1, wherein the antenna is characterized as a monopole antenna.

10. The antenna of claim 1, wherein the closed segmented shape has a trapezoidal shape.

11. A method for providing an antenna in a wireless receiving system, comprising:

(a) cutting a wire at a desired length, the wire having a first end point and a second end point;

(b) shaping a first portion of the wire into a closed segmented shape, the first portion including the second end point;

(c) electrically connecting the second end point to a connecting point between the first end point and the second end point to form the closed segmented shape;

(d) electrically connecting the antenna to a printed circuit board only at the first end point; and

(e) positioning the closed segmented shape away from a ground plane of the printed circuit board.

12. The method of claim 11, further comprising:

(f) modifying the closed segmented shape to tune the antenna, wherein the antenna operates at an operating frequency with a desired characteristic.

13. The method of claim 12, wherein the desired characteristic comprises s voltage standing wave ratio (VSWR) response.

14. The method of claim 12, wherein (f) comprises:

(f)(i) adjusting a length of an edge of the closed segmented shape.

15. The method of claim 11, wherein the closed segmented shape has a trapezoidal shape.

16. The method of claim 11, wherein (e) comprises:

(e)(i) bending the wire between the first end point and the connecting point.

17. The method of claim 11, further comprising:

(f) positioning the closed segmented shape to have a horizontal orientation.

18. The method of claim 11, further comprising:

(f) adjusting a vertical dimension of a second portion of the wire to accommodate the antenna within the same enclosure, the second portion being between the first end point and the connecting point.

19. The method of claim 11, wherein the desired length is approximately one quarter of an operating wavelength of the antenna.

20. The method of claim 11, further comprising:

(f) situating the antenna in a same enclosure as the printed circuit board.

21. An antenna for supporting a wireless microphone system, comprising:

a vertical antenna component providing a received signal to a printed circuit board at a first end point and having an essentially vertical orientation with respect to the printed circuit board; and

a horizontal antenna component having an essentially horizontal orientation with respect to the printed circuit board and having a closed segmented shape that is formed by an electrical wire along a periphery, the electrical wire being joined at a second end point of the open segmented component and that is characterized by;

electrically coupling to the open segmented component at the second end point;

providing a capacitive load for the antenna, the capacitive load tuning the antenna for an operating frequency value; and

situating the horizontal antenna component away from a ground plane of the printed circuit board at an angle formed by the open segmented component and the capacitive top loaded component at the second end point,

wherein the antenna is internally located within a same enclosure as the printed circuit board that supports the wireless microphone system and wherein the antenna is connected to the printed circuit board only at the first end point.