Multifrequency antenna with a slot-type conductor and a strip-shaped conductor

• US 20030112195A1
• Filed: 12/18/2001
• Published: 06/19/2003
• Est. Priority Date: 12/18/2001
• Status: Active Grant

• Current Assignee: Wistron NeWeb Corporation (Wistron Corporation)
• Original Assignee: Wistron NeWeb Corporation (Wistron Corporation)
• Inventors: Cheng, Wei-Li, Fang, Chien-Hsing
• Granted Patent: US 6,606,071 B2
• Time in Patent Office: Days
• US Class Current: 343/767
• CPC Class Codes: H01Q 13/10 Resonant slot antennas
• CPC Class Codes: H01Q 5/357 using a single feed point
• CPC Class Codes: H01Q 5/371 Branching current paths
• 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 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A multifrequency antenna for a wireless communications system includes a metallic plate having a slot. The slot is used for transmitting and receiving radio signals of a first frequency band. The length of the slot corresponds to the first frequency band at which signals are transmitted and received. The antenna also includes a metallic strip connected to the metallic plate for transmitting and receiving radio signals of a second frequency band. The metallic strip may be formed as an L-shaped strip. The length of the horizontal portion of the L-shaped strip corresponds to the second frequency band at which signals are transmitted and received.

Claims

1. A multifrequency antenna for a wireless communications system comprising:

a metallic plate having a slot defining a slot antenna for transmitting and receiving radio signals of a first frequency band; and

a metallic strip connected to a section of the metallic plate around the slot for transmitting and receiving radio signals of a second frequency band.

2. The multifrequency antenna of claim 1 further comprising a feed line connected with the metallic plate and the metallic strip for feeding radio signals to the multifrequency antenna.

3. The multifrequency antenna of claim 1 wherein the metallic strip is an L-shaped strip with one end connected to the metallic plate, the metallic strip having a first strip portion for transmitting and receiving radio signals of the second frequency band.

4. The multifrequency antenna of claim 3 wherein the L-shaped strip further comprises a second strip portion on which a feeding point of the multifrequency antenna is disposed.

5. The multifrequency antenna of claim 1 wherein the metallic strip is formed inside the slot.

6. The multifrequency antenna of claim 1 further comprising in the slot a feed strip having an end connected to the metallic plate for feeding radio signals.

7. The multifrequency antenna of claim 1 wherein the metallic plate has four side strips, the slot being formed inside the side strips and having a rectangular shape.

8. The multifrequency antenna of claim 7 wherein the feed strip and the metallic strip are connected to the same side strip of the metallic plate.

9. The multifrequency antenna of claim 7 wherein the feed strip and the metallic strip are connected to different side strips of the metallic plate.

10. The multifrequency antenna of claim 7 wherein one of the side strips is a ground strip.

11. The multifrequency antenna of claim 10 wherein the metallic plate is bent such that the ground strip is in a different plane than a plane of remaining three side strips.

12. The multifrequency antenna of claim 1 wherein the slot and the metallic strip are formed in the same plane.

13. The multifrequency antenna of claim 1, wherein the slot creates half-wave resonance.

14. The multifrequency antenna of claim 1, wherein the metallic strip creates quarter-wave resonance.

15. The multifrequency antenna of claim 1, further comprising an additional metallic strip connected to a section of the metallic plate around the slot for transmitting and receiving radio signals of a third frequency band.

16. A multifrequency antenna for a wireless communications system comprising:

a conductor layer having a resonance opening defining a slot antenna for transmitting and receiving radio signals within a selected frequency range; and

at least one radiation conductor connected at one end with the conductor layer around the opening thereof and having a resonance conductor portion for transmitting and receiving radio signals outside the selected frequency range.

17. The multifrequency antenna of claim 16 further comprising a feed line connected with the conductor layer and the radiation conductor for feeding radio signals to the multifrequency antenna.

18. The multifrequency antenna of claim 16, wherein two radiation conductors are connected with the conductor layer, one of which transmitting and receiving radio signals within a first frequency range outside the selected frequency range and the other transmitting and receiving radio signals within a second frequency range outside the first frequency range and the selected frequency range.

19. A multifrequency antenna for a wireless communications system comprising:

a conductive plate, having a slot defining a slot antenna for transmitting and receiving radio signals of a selected frequency band, and forming at least one conductive strip extending from a section of the conductive plate around the slot for transmitting and receiving radio signals outside the selected frequency band by creating resonance in the conductive strip.