Compact dual band antenna having common elements and common feed

• US 20060284770A1
• Filed: 06/15/2005
• Published: 12/21/2006
• Est. Priority Date: 06/15/2005
• Status: Abandoned Application

• Current Assignee: SkyCross, Inc.
• Original Assignee: SkyCross, Inc.
• Inventors: Lee, Dong-Gu, Caimi, Frank M., Jo, Young-Min
• Application Number:
  US11/153,891
• Publication Number:
  US 20060284770A1
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• 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 5/357 using a single feed point
• 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 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

A dual band antenna comprising structurally different antenna elements and having common feed. The antenna includes a ground plane, a radiating element and an arm extending from the radiating element. In a first operating mode energy is radiated from the arm, the radiating element and the ground plane. In a second operating mode energy is radiated from the radiating element and the ground plane. Thus the antenna operates in two modes with two different resonant frequencies.

Claims

1. An antenna comprising:

a ground plane;

a radiating element overlying the ground plane;

an arm extending from the radiating element;

a shorting element connecting the ground plane and the radiating element;

a feed terminal connected to the radiating element; and

wherein the antenna operates in at least two modes, each mode having a different resonant frequency.

2. The antenna of claim 1 having a first current distribution when operating in a first mode different from a second current distribution when operating in a second mode.

3. The antenna of claim 2 wherein the first current distribution comprises current in a region of the radiating element, in a region of the ground plane and in the arm.

4. The antenna of claim 2 wherein the second current distribution comprises current principally in the radiating element.

5. The antenna of claim 2 having a first bandwidth when operating in the first mode different from a second bandwidth when operating in the second mode.

6. The antenna of claim 2 operative in a dipole mode according to the first current distribution and operative in a patch mode according to the second current distribution, wherein the resonant frequency of the first current distribution is lower than the resonant frequency of the second current distribution.

7. The antenna of claim 1 wherein the radiating element is substantially parallel to the ground plane.

8. The antenna of claim 1 wherein the arm comprises a planar structure.

9. The antenna of claim 1 wherein a region of the arm extends beyond a periphery of the ground plane.

10. The antenna of claim 1 wherein the arm comprises an L-shaped planar structure or a U-shaped planar structure.

11. The antenna of claim 1 wherein the arm comprises a helical coil.

12. The antenna of claim 1 wherein an electrical length of the arm is selected to form a dipole antenna in combination with a region of the radiating element and a region of the ground plane.

13. The antenna of claim 1 wherein the radiating element comprises a spiral-shaped radiating element or a substantially solid planar element.

14. The antenna of claim 1 further comprising a dielectric material disposed between the radiating element and the ground plane, wherein the dielectric material has a dielectric constant greater than a dielectric constant of air.

15. The antenna of claim 1 wherein a resonant frequency of a dipole mode is responsive to a ground plane size.

16. The antenna of claim 1 wherein a first operational mode comprises a resonant frequency of about 800 MHz and a second operational mode comprises a resonant frequency of about 1900 MHz.

17. The antenna of claim 1 having a resonant frequency responsive to a distance between the shorting element and the feed terminal.

18. The antenna of claim 1 wherein the radiating element comprises a multi-loop spiral element and the arm comprises a region of an outer loop thereof.

19. The antenna of claim 1 wherein the radiating element comprises a first region substantially parallel to the ground plane and a second region forming an acute angle with the first region and extending in a direction toward the ground plane.

20. The antenna of claim 1 wherein the arm comprises a first region extending from the radiating element and disposed in a first plane substantially perpendicular to a plane of the radiating element and a second region disposed in a second plane different from the first plane.

21. The antenna of claim 1 wherein the arm comprises a first region disposed in a first plane and extending in a direction away from the radiating element and beyond the periphery of the ground plane, and a second region extending from the first region, wherein the second region is disposed in a second plane different from the first plane.

22. The antenna of claim 20 wherein the first plane and the second plane are substantially perpendicular.

23. An antenna comprising:

a ground plane;

a meanderline radiating element overlying the ground plane;

an arm extending from the radiating element;

a shorting element connecting the ground plane and the radiating element;

a feed terminal connected to the radiating element; and

wherein the antenna operates in at least two modes, each mode having a different resonant frequency.

24. The antenna of claim 23 wherein a first mode comprises a monopole mode and a second mode comprises a patch mode.

25. The antenna of claim 23 wherein the meanderline radiating element comprises an upper meanderline element in substantially parallel orientation with and electrically connected to a lower meanderline element, and wherein a terminal end of the lower meanderline element receives the arm.

26. The antenna of claim 23 wherein the arm comprises a helical radiating element.

27. The antenna of claim 23 wherein the antenna operates in a first mode having a resonant frequency of about 180-200 MHz and operates in a second mode having a resonant frequency of about 800 MHz.

28. A communications handset comprising

a substrate having electronic components mounted thereon and further comprising a ground region;

an antenna operative with the electronic components, comprising;

a ground plane connected to the ground region;

a radiating element overlying the ground plane;

an arm extending from the radiating element;

a shorting element connecting the ground plane and the radiating element;

a feed terminal connected to the radiating element; and

wherein the antenna operates in at least two modes, each mode having a different resonant frequency to permit operation of the communications handset at two resonant frequencies.

29. The communications handset of claim 28 further comprising structural components including a handset case, wherein certain of the structural components are connected to the ground region

30. The communications handset of claim 29 wherein the antenna exhibits a first current distribution when operating in a dipole mode different from a second current distribution when operating in a patch mode, wherein certain of the structural components radiate energy when the antenna is operative in the dipole mode.

31. The communications handset of claim 29 wherein the arm comprises a helical element extending from the handset case, and wherein the antenna operates in a monopole mode in which substantial energy is radiated from the helical antenna or operates in a patch mode in which substantial energy is radiated from the radiating element.

32. A communications handset comprising

a substrate having electronic components mounted thereon and further comprising a ground region;

an antenna operative with the electronic components, comprising;

a ground plane connected to the ground region;

a lower meanderline element overlying the ground plane;

an upper meanderline element substantially parallel to and electrically connected to the lower meanderline element

an arm extending from the lower meanderline element;

a shorting element connecting the ground plane and the lower meanderline element;

a feed terminal connected to the lower meanderline element; and

wherein the antenna operates in at least two modes, each mode having a different resonant frequency.