System and apparatus for a wideband omni-directional antenna

• US 7,292,196 B2
• Filed: 08/29/2005
• Issued: 11/06/2007
• Est. Priority Date: 08/29/2005
• Status: Active Grant

• Current Assignee: Pharad, LLC
• Original Assignee: Pharad, LLC
• Inventors: Waterhouse, Rodney B.
• Primary Examiner(s): Ho; Tan
• Application Number:
  US11/212,722
• Publication Number:
  US 20070046556A1
• Time in Patent Office: 799 Days
• Field of Search: 343/767, 343/770, 343/771
• US Class Current: 343/770
• CPC Class Codes: H01Q 13/085 Slot-line radiating ends
• CPC Class Codes: H01Q 13/10 Resonant slot antennas

Abstract

Embodiments generally relate to an antenna. The antenna includes at least two slot radiators, where each slot radiator has an input port and a profile that has been defined to optimize the return loss bandwidth of the antenna. The antenna also includes a transmission line and a circuit configured to connect the transmission line and the at least two slot radiators at the respective input ports. The circuit is also configured to match the impedance of the at least two slot radiators and the co-planar waveguide.

Claims

1. An antenna comprising:

at least two slot radiators, each slot radiator having an input port and a slot line;

a transmission line; and

a short circuit termination configured to connect the transmission line and the at least two slot radiators at their respective input ports, wherein the short circuit termination and the slot lines are also configured to match the impedance of the at least two slot radiators and the transmission line and optimize the distribution of power among the radiators.

2. The antenna according to claim 1, wherein the each slot radiator is further configured to have a taper profile.

3. The antenna according to claim 2, wherein the taper profile is configured to be one of exponential in shape and linear pieces.

4. The antenna according to claim 2, wherein a length and a width of the taper profile may be configured to be at least 0.2 times the wavelength.

5. The antenna according to claim 1, wherein the transmission line is a co-planar waveguide.

6. The antenna according to claim 1, wherein each slot radiator includes a slot closure.

7. The antenna according to claim 6, wherein the slot closure is configured to be substantially parabolic.

8. The antenna according to claim 6, wherein the slot closure is configured to be one of substantially exponential, linear, and piece-wise linear.

9. The antenna according to claim 1, wherein the transmission line is one of a co-planar waveguide and a co-planar waveguide equivalent and the at least two slot radiators and the co-planar waveguide are implemented on a common substrate.

10. The antenna according to claim 1, wherein a distribution of power is split reactively between the at least two slot radiators.

11. An antenna comprising:

at least two slot radiators, each slot radiator having an in put port and a slot line;

a transmission line; and

a short circuit termination configured to connect the transmission line and the at least two slot radiators at their respective input ports, wherein the short circuit termination and slot lines are also configured to match the impedance of the at least two slot radiators and the transmission line and the at least two slot radiators, the transmission line, and circuit formed on a three-dimensional substrate, and optimize the distribution of power among the radiators.

12. The antenna according to claim 11, wherein the each slot radiator is further configured to have a taper profile.

13. The antenna according to claim 12, wherein the taper profile is configured to be one of an exponential in shape or linear pieces.

14. The antenna according to claim 12, wherein a length and a width of the taper profile may be configured to be at least 0.2 times the wavelength.

15. The antenna according to claim 11, wherein the transmission line is a coplanar waveguide, or equivalent.

16. The antenna according to claim 11, wherein each slot radiator includes a slot closure.

17. The antenna according to claim 16, wherein the slot closure is configured to be substantially parabolic.

18. The antenna according to claim 16, wherein the slot closure is configured to be one of substantially exponential, linear, and piece-wise linear.

19. The antenna according to claim 11, wherein a distribution of power is split reactively between the at least two slot radiators.

20. An antenna comprising:

at least two slot radiators, each slot radiator having an input port;

a transmission line; and

a circuit configured to connect the transmission line and the at least two slot radiators at the respective input ports, wherein the circuit is also configured to match the impedance of the at least two slot radiators and the transmission line and the at least two slot radiators, the transmission line, and circuit formed on a three-dimensional substrate, wherein the three dimensional substrate is a cylinder.