Wideband microstrip leaky-wave antenna

• US 20020000936A1
• Filed: 01/17/2001
• Published: 01/03/2002
• Est. Priority Date: 06/02/2000
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Sheen, Jyh-Wen
• Granted Patent: US 6,340,951 B1
• Time in Patent Office: Days
• US Class Current: 343/700MS
• CPC Class Codes: H01Q 13/206 Microstrip transmission line antennas

Abstract

A wideband microstrip leaky-wave antenna comprising a substrate with a cavity, a microstrip line located on a first surface of the substrate and a conductive plate located on a second surface of substrate opposite to the first surface. Using the cavity between the microstrip line and the conductive plate can reduce the effective dielectric constant of the substrate and further increase the bandwidth of the antenna. In addition, the microstrip line also can be located in the cavity. In this case, there is no dielectric material between the microstrip line and the conductive plate.

Claims

1. A wideband microstrip leaky-wave antenna, comprising:

a substrate constituted by at least one dielectric layer and having a cavity therein;

a microstrip line made of conductive material and located on a first surface of the substrate corresponding to a location of the cavity, for emitting leaky waves; and

a conductive plate made of conductive material and located on a second surface of the substrate opposite to the first surface.

2. The wideband microstrip leaky-wave antenna as recited in claim 1, wherein the microstrip line is located exactly over the cavity of the substrate.

3. The wideband microstrip leaky-wave antenna as recited in claim 1, wherein the cavity of the substrate is located on the second surface of the substrate and contiguous to the conductive plate.

4. The wideband microstrip leaky-wave antenna as recited in claim 3, wherein the microstrip line is located exactly over the cavity of the substrate.

5. The wideband microstrip leaky-wave antenna as recited in claim 1, wherein the substrate further comprises:

a dielectric layer; and

at least one prop element located between the dielectric layer and the conductive plate, for defining the cavity in a vacant space between the dielectric layer and the conductive plate.

6. The wideband microstrip leaky-wave antenna as recited in claim 5, wherein the microstrip line is exactly located over the cavity of the substrate.

7. A wideband microstrip leaky-wave antenna, comprising:

a substrate constituted by at least one dielectric layer and having a cavity therein;

a microstrip line made of conductive material and located in the cavity of the substrate, for emitting leaky waves; and

a conductive plate made of conductive material and located on a surface of the substrate, the dielectric layer of the substrate being excluded from a space between the conductive plate and the microstrip line.

8. The wideband microstrip leaky-wave antenna as recited in claim 7, wherein the cavity of the substrate is contiguous to the conductive plate.

9. The wideband microstrip leaky-wave antenna as recited in claim 7, wherein the substrate further comprises:

a dielectric layer; and

at least one prop element located between the dielectric layer and the conductive plate, for defining the cavity in the space between the dielectric layer and the conductive plate.

10. A wideband microstrip leaky-wave antenna, comprising:

a substrate constituted by at least one dielectric layer; and

a microstrip line made of conductive material and located on a first surface of the substrate, for emitting leaky waves, wherein on a second surface of the substrate opposite to the first surface there is no conductive plate corresponding to the microstrip line.

11. A wideband microstrip leaky-wave antenna, comprising:

a microstrip line made of conductive material and surrounded by the air, an end of the microstrip line being fed into a current for emitting leaky waves.