Multi-band antenna system

• US 20070152881A1
• Filed: 12/29/2005
• Published: 07/05/2007
• Est. Priority Date: 12/29/2005
• Status: Abandoned Application

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Chan, Yiu
• Application Number:
  US11/322,139
• Publication Number:
  US 20070152881A1
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• CPC Class Codes: H01Q 1/243 with built-in antennas
• 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 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 5/35 using two or more simultaneously fed points
• CPC Class Codes: H01Q 5/357 using a single feed point

Abstract

An antenna (100) is provided, which can be used in a wireless communication device or a base transceiver station forming part of the infrastructure of a wireless communication system. The antenna includes a first plate conductor (102) and a second plate conductor (104), which are substantially symmetric. The first plate conductor and the second plate conductor are separated by a central slot (106) and include respective primary feed points proximate the central slot, which are adapted for receiving a differential signal from a differential signal source (108). The first plate conductor and the second plate conductor exhibit at least a first frequency response (F1) and a second frequency response (F2) dependent on various dimensions of both the first plate conductor and the second plate conductor, relative to their respective primary feed point.

Claims

1. An antenna comprising:

first and second plate conductors, which are substantially symmetric, dimensions of each plate conductor including a respective length and width, where the first and second plate conductors are separated by a central slot having a predetermined width, each of the first and second plate conductors includes a respective primary feed point proximate the central slot, which together are adapted for receiving a differential signal; and

wherein the first and second plate conductors are adapted for radiating one or more signals at two or more frequencies, where the two or more frequencies are dependent upon one or more of the dimensions of the first and second plate conductors in relation to the respective feed point.

2. An antenna in accordance with claim 1, wherein each plate conductor has a pair of edges, which is separated by the width of the respective plate conductor, and wherein the respective primary feed point is proximate one of the edges.

3. An antenna in accordance with claim 2, wherein the respective primary feed point is positioned an offset distance away from the proximate edge.

4. An antenna in accordance with claim 1, wherein a first frequency of the two or more frequencies is dependent upon a diagonal length of the respective plate conductor from the primary feed point to a corner of the plate conductor located substantially opposite the feed point.

5. An antenna in accordance with claim 4, wherein the diagonal length of the respective conductor from the primary feed point to a corner of the plate conductor located substantially opposite the feed point is approximately one quarter of the wavelength of the first frequency.

6. An antenna in accordance with claim 1, wherein a second frequency of the two or more frequencies is dependent upon an effective width of the respective plate conductor from the primary feed point to an opposite edge of the plate conductor proximate the central slot.

7. An antenna in accordance with claim 6, wherein the effective width of the respective plate conductor from the primary feed point to an opposite edge of the plate conductor proximate the central slot is approximately one quarter of the wavelength of the second frequency.

8. An antenna in accordance with claim 6, further comprising a notch, at the opposite edge of the plate conductor and extending in from the edge of the plate conductor, proximate the central slot, a distance corresponding to a depth of the notch, wherein the effective width of the respective plate conductor is dependant upon the distance between the primary feed point and the opposite edge, less the depth of the notch.

9. An antenna in accordance with claim 8, wherein the notch has a width, which extends from the central slot and along the length of the respective plate conductor a distance, which is substantially equal to or greater than the predetermined width of the central slot.

10. An antenna in accordance with claim 1, wherein one or more of the respective plate conductors includes a secondary slot, which extends from a distal one of a pair of edges defined by the length of the plate conductor, which is distal relative to the central slot, and extends along a path toward a center of the respective conductor along the length of the plate conductor, and wherein the secondary slot includes a respective secondary feed point proximate the end of the secondary slot toward the center of the respective plate conductor, and wherein the respective plate conductor is adapted to radiate at a third frequency, where the third frequency is dependent upon the length of the path of the secondary slot relative to the secondary feed point.

11. An antenna in accordance with claim 10, wherein along the length of one or more of the one or more secondary slots, the length of the path of the slot includes one or more changes in direction.

12. An antenna in accordance with claim 10, wherein the length of the path of the secondary slot relative to the secondary feed point is approximately one quarter of the wavelength of the third frequency.

13. An antenna in accordance with claim 1, wherein the antenna is incorporated in a wireless communication device.

14. An antenna in accordance with claim 1, wherein the antenna is incorporated in a base transceiver station forming part of an infrastructure of a wireless communication system.

15. A wireless communication device comprising:

an antenna, the antenna comprising;

first and second plate conductors, which are substantially symmetric, dimensions of each plate conductor including a respective length and width, where the first and second plate conductors are separated by a central slot having a predetermined width, each of the first and second plate conductors includes a respective primary feed point proximate the central slot, which together are adapted for receiving a differential signal; and

wherein the first and second plate conductors are adapted for radiating one or more signals at two or more frequencies, where the two or more frequencies are dependent upon one or more of the dimensions of the first and second plate conductors in relation to the respective feed point; and

at least one of a primary transmitter and a primary receiver coupled to the respective primary feed points.

16. A wireless communication device in accordance with claim 15, wherein one or more of the respective plate conductors includes a secondary slot, which extends from a distal one of a pair of edges defined by the length of the plate conductor, which is distal relative to the central slot, and extends along a path toward a center of the respective plate conductor along the length of the plate conductor, and wherein the secondary slot includes a respective secondary feed point proximate the end of the secondary slot toward the center of the respective plate conductor, and wherein the respective plate conductor is adapted to radiate at a third frequency, where the third frequency is dependent upon the length of the path of the secondary slot relative to the secondary feed point, and wherein the wireless communication device further comprises at least one of a respective secondary transmitter and a respective secondary receiver coupled to each of the respective secondary feed points.

17. A wireless communication device in accordance with claim 15, further comprising a two part housing including a upper housing and a lower housing, and wherein the first plate conductor is incorporated as part of the upper housing and the second plate conductor is incorporated as part of the lower housing.

18. A wireless communication device in accordance with claim 17, wherein the first and second plate conductor are incorporated as part of a chassis of the respective upper and lower housings.

19. A wireless communication device in accordance with claim 18, wherein the chassis includes a printed circuit board.

20. A wireless communication device in accordance with claim 17, wherein the upper and lower housing rotate relative to one another, about a hinge.