Log-periodic antenna device

TWM687431UActive Publication Date: 2026-09-11SMARTANT TELECOMM
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Patent Information

Application Number
TW115204641
Authority / Receiving Office
TW · TW
Patent Type
Utility models
Current Assignee / Owner
Filing Date
2026-05-22
Publication Date
2026-09-11
Estimated Expiration
2036-05-21

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Abstract

A log-periodic antenna device includes a circuit board, two log-periodic antenna structures, two balun structures, and two connecting portions. The circuit board has two opposing bearing surfaces. The two log-periodic antenna structures are respectively disposed on the two bearing surfaces. The two balun structures are respectively disposed on the two log-periodic antenna structures. The two connecting portions are respectively disposed at one end of the two balun structures relative to the two log-periodic antenna structures.
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Claims

1. A log-periodic antenna device, comprising: a circuit board having two opposing bearing surfaces; two log-periodic antenna structures respectively disposed on the two bearing surfaces; two balun structures respectively disposed on the two log-periodic antenna structures; and two connecting portions respectively disposed at one end of the two balun structures relative to the two log-periodic antenna structures.

2. The log-periodic antenna device as claimed in claim 1, wherein each of the two log-periodic antenna structures comprises: an antenna mast and a plurality of vibrators, the vibrators being vertically disposed on opposite sides of the antenna mast.

3. The log-periodic antenna arrangement as claimed in claim 2, wherein the extension direction of one of the elements is opposite to the extension direction of the other of the adjacent elements.

4. The log-periodic antenna apparatus as claimed in claim 2, wherein the length of one of the elements closer to the double balun structure is less than the length of the other of the adjacent elements farther from the double balun structure.

5. The log-periodic antenna arrangement as claimed in claim 2, wherein the width of one of the elements closer to the double balun structure is less than or equal to the width of the other of the adjacent elements farther from the double balun structure.

6. The log-periodic antenna apparatus as claimed in claim 2, wherein the distance between the elements disposed on the same side of the antenna mast and close to the double balun structure is less than the distance between the elements far from the double balun structure.

7. The log-periodic antenna device as claimed in claim 1, wherein the two log-periodic antenna structures are anti-symmetrical relative to the circuit board.

8. The log-periodic antenna device as claimed in claim 1 further includes an SMA connector, wherein the SMA connector is disposed at one end of one of the two log-periodic antenna structures and relative to one end of the two balun structures, and is electrically connected to the two connecting portions.

9. The log-periodic antenna device as claimed in claim 1, wherein the maximum voltage standing wave ratio of the log-periodic antenna device is 3.0:1 at frequencies between 0.8 GHz and 6 GHz.

10. The log-periodic antenna device as claimed in claim 1, wherein the maximum gain of the log-periodic antenna device is greater than 7 dBi.