Antenna device

Abstract

An antenna device includes a metal box, a substrate, a main radiating section, a high-frequency short-circuit section, a low-frequency short-circuit section, and a connecting section. The substrate is disposed on the metal box, and the substrate and the metal box together surround a resonant cavity. The substrate has an opening communicating with the resonant cavity. The main radiating section is disposed on the substrate. The high-frequency short-circuit section, the low-frequency short-circuit section, and the connecting section are disposed on the substrate. The connecting section and the high-frequency short-circuit section are connected to opposite ends of the main radiating section, and the main radiating section and the connecting section are located on the same side of the opening. The high-frequency short-circuit section and the low-frequency short-circuit section are respectively located on opposite sides of the opening, and the high-frequency short-circuit section and the low-frequency short-circuit section have different lengths. The main radiating section, the high-frequency short-circuit section, and the low-frequency short-circuit section are coupled to the metal box, so that the metal box serves as a grounding portion for the main radiating section, the high-frequency short-circuit section, and the low-frequency short-circuit section.

Claims

1. An antenna device, comprising: a metal box; a substrate disposed in the metal box, the substrate and the metal box together surrounding a resonant cavity, the substrate having an opening communicating with the resonant cavity; a main radiating portion disposed in the substrate; a high-frequency short-circuit portion, a low-frequency short-circuit portion and a connecting portion disposed in the substrate, wherein the connecting portion and the high-frequency short-circuit portion are connected to opposite ends of the main radiating portion, the main radiating portion and the connecting portion are located on the same side of the opening, the high-frequency short-circuit portion and the low-frequency short-circuit portion are respectively located on opposite sides of the opening, and the high-frequency short-circuit portion and the low-frequency short-circuit portion have different lengths; and a feed point located on the side of the main radiating portion away from the opening and close to one end of the low-frequency short-circuit portion; wherein... The main radiating part, the high-frequency short-circuit part, and the low-frequency short-circuit part are coupled to the metal box, so that the metal box serves as the grounding part for the main radiating part, the high-frequency short-circuit part, and the low-frequency short-circuit part.

2. The antenna device as claimed in claim 1, wherein the width of the connecting portion is not equal to that of the main radiating portion.

3. The antenna device as claimed in claim 1, wherein the low-frequency short-circuit portion is perpendicular to and connected to the connecting portion, and is connected to both sides of the opening.

4. The antenna device as claimed in claim 1, wherein the thickness of the substrate is 0.8 mm.

5. The antenna device as claimed in claim 1, wherein the length of the main radiating part is 22 mm and the width of the main radiating part is 3 mm.

6. The antenna device as claimed in claim 1, wherein the high-frequency short-circuit portion is separated from the opening and is 1.8 mm away from the opening.

7. The antenna device as claimed in claim 1, wherein the length of the high-frequency short circuit is 9 mm and the width of the high-frequency short circuit is 1 mm.

8. The antenna device as claimed in claim 1, wherein the length of the low-frequency short circuit portion is 14.5 mm, the length of the connector portion is 6 mm, the width of the low-frequency short circuit portion is 1 mm, and the width of the connector portion is 1 mm.

9. The antenna device as claimed in claim 1 further includes a horn located within the resonant cavity.

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