MOBILE WIDEBAND ANTENNAS

• US 20080198077A1
• Filed: 02/15/2007
• Published: 08/21/2008
• Est. Priority Date: 02/15/2007
• Status: Active Grant

• Current Assignee: Laird Technologies Incorporated (DuPont de Nemours, Inc.)
• Original Assignee: Laird Technologies Incorporated (DuPont de Nemours, Inc.)
• Inventors: Duzdar, Ayman, Quach, Tan Dinh
• Granted Patent: US 7,492,318 B2
• Time in Patent Office: Days
• US Class Current: 343/715
• CPC Class Codes: H01Q 1/3275 mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system

Abstract

In various exemplary embodiments, a wideband antenna assembly includes a stamped monopole antenna mast having two or more conductors combined to a single feed. The conductors are combined at a predetermined height above the point of connection with the single feed. The conductors further have a predetermined spacing between the conductors.

Claims

1. An antenna assembly for installation to a vehicle body wall operable as an electrically large ground plane for the antenna assembly after installation thereto, the antenna assembly comprising a stamped metal monopole antenna mast, the antenna mast including:

a first conductor tuned to at least one electrical resonant frequency for operating within a bandwidth ranging from about 800 MHz to about 1000 MHz;

a second conductor tuned to at least one electrical resonant frequency for operating within a bandwidth ranging from about 1650 MHz to about 2700 MHz;

an open slot extending at least partially between the first and second conductors to provide impedance matching;

when electrically coupled to an electrically large ground plane, the antenna mast having a voltage standing wave ratio (VSWR) of about 2;

1 or less at frequencies within a bandwidth ranging from about 800 MHz to about 1000 MHz and at frequencies within a bandwidth ranging from about 1650 MHz to about 2700 MHz.

2. The antenna assembly of claim 1, wherein the antenna mast is stamped from a single sheet of material.

3. The antenna assembly of claim 1, wherein:

the first and second conductors are connected at a base portion and extend generally away from the base portion;

the first conductor is generally bulbous in shape;

the second conductor is elongate and generally arcuate in shape such that the second conductor extends partly around the first conductor; and

the open slot extends from the base portion generally between the first and second conductors.

4. The antenna assembly of claim 1, wherein the antenna mast has an average vertical gain of about negative five dBi or higher at an elevation angle of about zero degrees at frequencies within a bandwidth ranging from about 800 MHz to about 1000 MHz and at frequencies within a bandwidth ranging from about 1650 MHz to about 2700 MHz.

5. The antenna assembly of claim 4, wherein the antenna mast has an average vertical gain of about four dBi at elevation angles ranging from about twenty-five degrees to about thirty-five degrees at frequencies within a bandwidth ranging from about 800 MHz to about 1000 MHz and at frequencies within a bandwidth ranging from about 1650 MHz to about 2700 MHz.

6. The antenna assembly of claim 1, further comprising:

a chassis mounted to a vehicle roof which is operable as the ground plane for the antenna assembly at frequencies at least ranging from about 800 MHz to about 1000 MHz, the chassis supporting the antenna mast above the vehicle roof such that the antenna mast extends generally vertically relative to the vehicle roof; and

a printed circuit board supported by the chassis and connected to the antenna mast for operation,

whereby impedance matching for the antenna assembly is provided by the open slot.

7. A stamped metal monopole antenna mast for an antenna assembly for installation to a vehicle body wall operable as an electrically large ground plane for the antenna assembly after installation thereto, the stamped metal monopole antenna mast comprising:

a first conductor tuned for receiving electrical resonant frequencies within a first frequency bandwidth;

a second conductor tuned for receiving electrical resonant frequencies within a second frequency bandwidth different than the first frequency bandwidth;

a base portion from which the first and second conductors extend generally away; and

an open slot extending from the base portion generally between the first and second conductors, the open slot providing impedance matching for the antenna assembly.

8. An antenna assembly including the antenna mast of claim 7, and installed to a vehicle roof such that vehicle roof is an electrically large ground plane for the antenna assembly at a lower frequency band ranging from about 800 MHz to about 1000 MHz.

9. The antenna mast of claim 7, wherein:

the first conductor is tuned for receiving signals within a bandwidth ranging from about 800 MHz to about 1000 MHz; and

the second conductor is tuned for receiving signals within a bandwidth of about 1650 MHz to about 2700 MHz.

10. The antenna mast of claim 9, wherein the antenna mast has an average vertical gain of about negative five dBi or higher at an elevation angle of about zero degrees at frequencies within a bandwidth ranging from about 800 MHz to about 1000 MHz and at frequencies within a bandwidth ranging from about 1650 MHz to about 2700 MHz.

11. The antenna mast of claim 10, wherein the antenna mast has an average vertical gain of about four dBi at elevation angles ranging from about twenty-five degrees to about thirty-five degrees at frequencies within a bandwidth ranging from about 800 MHz to about 1000 MHz and at frequencies within a bandwidth ranging from about 1650 MHz to about 2700 MHz.

12. An antenna assembly including the antenna mast of claim 9, and having a voltage standing wave ratio (VSWR) of about 2:

1 or less at frequencies within a bandwidth ranging from about 800 MHz to about 1000 MHz and at frequencies within a bandwidth ranging from about 1650 MHz to about 2700 MHz.

13. The antenna mast of claim 7, wherein the antenna mast is stamped from a single sheet of material.

14. The antenna mast of claim 7, wherein:

the first conductor is generally bulbous in shape;

the second conductor is elongate and generally arcuate in shape such that the second conductor extends partly around the first conductor.

15. An antenna assembly including the antenna mast of claim 7, and further comprising:

a chassis supporting the antenna mast above the vehicle body wall;

a printed circuit board supported by the chassis and connected to the antenna mast for operation.

16. The antenna assembly of claim 15, wherein impedance matching is provided solely by the open slot.

17. The antenna assembly of claim 15, wherein at least a portion of the base portion of the antenna mast is soldered to the printed circuit board.

18. The antenna assembly of claim 15, wherein the antenna mast is about seven millimeters or more above the vehicle body wall.

19. The antenna mast of claim 7, wherein the second conductor includes first and second elongate portions, the first elongate portion joined to a lower portion of the first conductor at a predetermined height above the vehicle body wall, the first elongate portion extending generally vertically upward relative to the vehicle body wall along a first edge of the first conductor, the second elongate portion extending from the first elongate portion such that an obtuse angle is defined therebetween, the second elongate portion extending from the first edge of the first conductor generally over and across the width of the first conductor.

20. A stamped metal monopole antenna mast for an antenna assembly for installation to a vehicle body wall operable as an electrically large ground plane for the antenna assembly after installation thereto, the stamped metal monopole antenna mast comprising:

a first conductor tuned to at least one electrical resonant frequency for operating within a bandwidth ranging from about 800 MHz to about 1000 MHz;

a second conductor tuned to at least one electrical resonant frequency for operating within a bandwidth of about 1650 MHz to about 2700 MHz;

an open slot extending at least partially between the first and second conductors to provide impedance matching;

the antenna mast configured to have an average vertical gain of about negative five dBi or higher at an elevation angle of about zero degrees at frequencies within the bandwidth ranging from about 800 MHz to about 1000 MHz and at frequencies within the bandwidth ranging from about 1650 MHz to about 2700 MHz.

21. The antenna mast of claim 20, wherein the antenna mast has an average vertical gain of about four dBi at elevation angles ranging from about twenty-five degrees to about thirty-five degrees at frequencies within a bandwidth ranging from about 800 MHz to about 1000 MHz and at frequencies within a bandwidth ranging from about 1650 MHz to about 2700 MHz.

22. An antenna assembly including the antenna mast of claim 20, and installed to a vehicle roof such that vehicle roof is operable as an electrically large ground plane for the antenna assembly at a lower frequency band ranging from about 800 MHz to about 1000 MHz.

23. An antenna assembly including the antenna mast of claim 20, and having a voltage standing wave ratio (VSWR) of about 2:

1 or less at frequencies within a bandwidth ranging from about 800 MHz to about 1000 MHz and at frequencies within a bandwidth ranging from about 1650 MHz to about 2700 MHz.

24. The antenna mast of claim 20, wherein the antenna mast is stamped from a single sheet of material.

25. The antenna mast of claim 20, wherein:

the first conductor is generally bulbous in shape; and

the second conductor is elongate and generally arcuate in shape such that the second conductor extends partly around the first conductor.

26. An antenna assembly including the antenna mast of claim 20, and further comprising:

a chassis supporting the antenna mast above the vehicle body wall;

a printed circuit board supported by the chassis and connected to the antenna mast for operation.

27. The antenna assembly of claim 26, wherein the impedance matching is provided solely by the open slot.

28. An antenna assembly for installation to a vehicle body wall operable as an electrically large ground plane for the antenna assembly after installation thereto, the antenna assembly comprising a monopole antenna mast stamped from a piece of sheet metal and tuned for operating at frequencies within a bandwidth ranging from about 800 MHz to about 1000 MHz and at frequencies within a bandwidth ranging from about 1650 MHz to about 2700 MHz.

29. The assembly of claim 28, wherein the antenna comprises two or more integrally formed conductors.