Ultra-wideband, low profile antenna

Patent metadata

Field	Value
Publication number	US-9337540-B2
Application number	US-201414296138-A
Country	US
Kind code	B2
Filing date	Jun 4, 2014
Priority date	Jun 4, 2014
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

An antenna system that includes a ground plane substrate, a first antenna, and a second antenna is provided. The first antenna includes a first loop conductor electrically connected to a feed network and to the ground plane substrate, a second loop conductor electrically connected to the feed network and to the ground plane substrate, and a first conductor mounted to and electrically connected to a first edge of the first loop conductor and to a second edge of the second loop conductor. The second antenna includes a third loop conductor electrically connected to the feed network and to the first conductor, a fourth loop conductor electrically connected to the feed network and to the first conductor, and a second conductor mounted to and electrically connected to a third edge of the third loop conductor and to a fourth edge of the fourth loop conductor.

First claim

What is claimed is:

1. An antenna system comprising:
a ground plane substrate that is generally flat;
a first antenna comprising
a first loop conductor electrically connected at a first point to a feed network and at a second point to the ground plane substrate;
a second loop conductor electrically connected at a third point to the feed network and at a fourth point to the ground plane substrate; and
a first conductor mounted to and electrically connected to a first edge of the first loop conductor between the first point and the second point and to a second edge of the second loop conductor between the third point and the fourth point; and

a second antenna comprising
a third loop conductor electrically connected at a fifth point to the feed network and at a sixth point to the first conductor;
a fourth loop conductor electrically connected at a seventh point to the feed network and at an eighth point to the first conductor; and
a second conductor mounted to and electrically connected to a third edge of the third loop conductor between the fifth point and the sixth point and to a fourth edge of the fourth loop conductor between the seventh point and the eighth point.

2. The antenna system of claim 1 , wherein the second conductor is generally flat and oriented in a first plane approximately parallel to a second plane defined by the ground plane substrate.

3. The antenna system of claim 2 , wherein the first conductor is generally flat and oriented in a third plane approximately parallel to the first plane and to the second plane.

4. The antenna system of claim 2 , wherein the second conductor has a polygonal shape when projected into the second plane.

5. The antenna system of claim 2 , wherein the first conductor is generally flat and oriented in a third plane approximately parallel to the first plane and to the second plane except for a recess formed by a first wall that extends from the first edge downward toward the first point and a second wall that extends from the second edge downward toward the third point.

6. The antenna system of claim 1 , further comprising the feed network, wherein the feed network comprises a diplexer configured to provide a first signal having a transmission frequency below approximately a first frequency to the first antenna and to provide a second signal having a transmission frequency approximately above the first frequency to the second antenna.

7. The antenna system of claim 6 , wherein the feed network further comprises an impedance matching circuit electrically connected to the diplexer.

8. The antenna system of claim 7 , wherein the impedance matching circuit comprises a series connected capacitor connected between the diplexer and the first antenna.

9. The antenna system of claim 6 , wherein the second antenna is a smaller scaled version of the first antenna, wherein the second antenna is scaled in size relative to the first antenna based on the first frequency.

10. The antenna system of claim 1 , further comprising a third antenna comprising:
a fifth loop conductor electrically connected at a ninth point to the feed network and at a tenth point to the second conductor;
a sixth loop conductor electrically connected at an eleventh point to the feed network and at a twelfth point to the second conductor; and
a third conductor mounted to and electrically connected to a fifth edge of the fifth loop conductor between the ninth point and the tenth point and to a sixth edge of the sixth loop conductor between the eleventh point and the twelfth point.

11. The antenna system of claim 1 , wherein the first antenna further comprises a fifth loop conductor electrically connected at a ninth point to the feed network, at a tenth point to the ground plane substrate, and along a fifth edge to the first conductor.

12. The antenna system of claim 1 , wherein the sixth point and the eighth point are between the first edge and the second edge.

13. The antenna system of claim 12 , wherein a minimum distance between the sixth point and the ground plane substrate is less than a minimum distance between the first edge and the ground plane substrate.

14. The antenna system of claim 12 , wherein the first conductor extends from the first edge generally parallel to the ground plane substrate away from the second antenna, wherein the first conductor extends from the second edge generally parallel to the ground plane substrate away from the second antenna, wherein the first conductor extends from the first edge downward toward the first point and along the first loop conductor to define a fifth edge, wherein the first conductor extends from the second edge downward toward the third point and along the second loop conductor to define a sixth edge, and wherein the first conductor extends generally parallel to the ground plane substrate between the fifth edge and the sixth edge.

15. The antenna system of claim 1 , wherein the first point and the third point are between the first edge and the second edge.

16. The antenna system of claim 1 , wherein the second loop conductor is mounted as a mirror image of the first loop conductor.

17. The antenna system of claim 16 , wherein the first loop conductor has a quadrilateral shape when projected into a plane defined by the ground plane substrate, wherein a first pair of adjacent sides of the quadrilateral shape that extend from the first point are of equal length and a second pair of adjacent sides of the quadrilateral shape that extend from the second point are of equal length.

18. The antenna system of claim 17 , wherein the first edge extends along a diagonal that connects the first pair of adjacent sides and the second pair of adjacent sides.

19. The antenna system of claim 16 , wherein the first loop conductor is connected to the ground plane substrate at only the second point.

20. The antenna system of claim 16 , wherein the first loop conductor comprises a half-cone conductor and a rod conductor, wherein the half-cone conductor is electrically connected at the first point to the feed network and at a ninth point to the first conductor, wherein the rod conductor is electrically connected at the second point to the ground plane substrate and at a tenth point to the first conductor.

Assignees

• Wisconsin Alumni Res Found

Inventors

• Behdad Nader
• Ghaemi Kasra

Classifications

• H01Q7/00 Primary

  Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop · CPC title

• H01Q21/0006

  Particular feeding systems · CPC title

• H01Q21/30

  Combinations of separate antenna units operating in different wavebands and connected to a common feeder system · CPC title

• H01Q1/36 Primary

  Structural form of radiating elements, e.g. cone, spiral, umbrella; {Particular materials used therewith}(H01Q1/08, H01Q1/14 take precedence) · CPC title

• H01Q5/25

  Ultra-wideband [UWB] systems, e.g. multiple resonance systems; Pulse systems · CPC title