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US-12620722-B2 - Antenna structure

US12620722B2US 12620722 B2US12620722 B2US 12620722B2US-12620722-B2

Abstract

An antenna structure includes a feeding adjustment element, an asymmetrical radiation element, a first meandering radiation element, a second meandering radiation element, a connection radiation element, a first additional radiation element, a second additional radiation element, and a dielectric substrate. A closed loop structure is formed by the first meandering radiation element, the second meandering radiation element, and the connection radiation element. The first additional radiation element is coupled to the connection radiation element and the first meandering radiation element. A first open slot and a first closed slot are formed between the first meandering radiation element and the first additional radiation element. The second additional radiation element is coupled to the connection radiation element and the second meandering radiation element. A second open slot and a second closed slot are formed between the second meandering radiation element and the second additional radiation element.

Inventors

  • Wan-Ju HUANG

Assignees

  • WISTRON NEWEB CORP.

Dates

Publication Date
20260505
Application Date
20240912
Priority Date
20240703

Claims (20)

  1. 1 . An antenna structure, comprising: a feeding adjustment element coupled to a first feeding point; an asymmetrical radiation element coupled to the feeding adjustment element; a first meandering radiation element coupled to a second feeding point; a second meandering radiation element coupled to the second feeding point; a connection radiation element coupled between the first meandering radiation element and the second meandering radiation element, wherein the first meandering radiation element, the second meandering radiation element, and the connection radiation element collectively form a closed loop structure; a first additional radiation element coupled to the connection radiation element, wherein the first additional radiation element is further coupled to the first meandering radiation element, forming a first open slot and a first closed slot between the first meandering radiation element and the first additional radiation element; a second additional radiation element coupled to the connection radiation element, wherein the second additional radiation element is further coupled to the second meandering radiation element, forming a second open slot and a second closed slot between the second meandering radiation element and the second additional radiation element; and a dielectric substrate, wherein the feeding adjustment element, the asymmetrical radiation element, the first meandering radiation element, the second meandering radiation element, the connection radiation element, the first additional radiation element, and the second additional radiation element are disposed on the dielectric substrate.
  2. 2 . The antenna structure according to claim 1 , wherein the feeding adjustment element is in the form of a variable-width strip.
  3. 3 . The antenna structure according to claim 1 , wherein the feeding adjustment element is disposed between the first meandering radiation element and the second meandering radiation element.
  4. 4 . The antenna structure according to claim 1 , wherein the asymmetrical radiation element comprises a rectangular part, a tapered part, and an extension part, and the tapered part is coupled between the rectangular part and the extension part.
  5. 5 . The antenna structure according to claim 4 , wherein the extension part of the asymmetrical radiation element is closer to the first meandering radiation element than the second meandering radiation element.
  6. 6 . The antenna structure according to claim 4 , wherein the first meandering radiation element further comprises a first edge extension segment, and the second meandering radiation element further comprises a second edge extension segment.
  7. 7 . The antenna structure according to claim 1 , wherein the first meandering radiation element is inverted U-shaped for defining a first notch region.
  8. 8 . The antenna structure according to claim 7 , wherein the first additional radiation element extends into the first notch region and is coupled to a first connection point on the first meandering radiation element.
  9. 9 . The antenna structure according to claim 1 , wherein the second meandering radiation element is another inverted U-shape for defining a second notch region.
  10. 10 . The antenna structure according to claim 9 , wherein the second additional radiation element extends into the second notch region and is coupled to a second connection point on the second meandering radiation element.
  11. 11 . The antenna structure according to claim 1 , wherein the combination of the feeding adjustment element, the first meandering radiation element, the second meandering radiation element, the connection radiation element, the first additional radiation element, and the second additional radiation element forms a symmetrical pattern.
  12. 12 . The antenna structure according to claim 6 , wherein the antenna structure covers a low-frequency band and a high-frequency band, and the high-frequency band comprises a specific frequency, a first frequency interval, a second frequency interval, and a third frequency interval.
  13. 13 . The antenna structure according to claim 12 , wherein the low-frequency band ranges from 617 MHz to 960 MHz, and the high-frequency band ranges from 1450 MHz to 5925 MHz.
  14. 14 . The antenna structure according to claim 12 , wherein the specific frequency is approximately 1700 MHz, the first frequency interval ranges from 2500 MHz to 2700 MHZ, the second frequency interval ranges from 3300 MHz to 4200 MHz, and the third frequency interval ranges from 5150 MHz to 5925 MHz.
  15. 15 . The antenna structure according to claim 12 , wherein the length of the closed loop structure is approximately equal to 0.25 times the wavelength of the lowest frequency of the low-frequency band.
  16. 16 . The antenna structure according to claim 12 , wherein the length of the asymmetrical radiation element is approximately equal to 0.25 times the wavelength of the lowest frequency of the high-frequency band.
  17. 17 . The antenna structure according to claim 12 , wherein the length of each of the first open slot and the second open slot is approximately equal to 0.25 times the wavelength of the center frequency of the first frequency interval.
  18. 18 . The antenna structure according to claim 12 , wherein the length of each of the first closed slot and the second closed slot is approximately equal to 0.25 times the wavelength of the center frequency of the second frequency interval.
  19. 19 . The antenna structure according to claim 12 , wherein the length of each of the first edge extension segment and the second edge extension segment is approximately equal to 0.25 times the wavelength of the center frequency of the third frequency interval.
  20. 20 . The antenna structure according to claim 12 , wherein the distance between the rectangular part of the asymmetrical radiation element and the first meandering radiation element or the second meandering radiation element is approximately equal to 0.125 times the wavelength of the specific frequency.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims priority of Taiwan Patent Application No. 113124931 filed on Jul. 3, 2024, the entirety of which is incorporated by reference herein. BACKGROUND OF THE INVENTION Field of the Invention The present disclosure relates to an antenna structure, in particular to a wideband antenna structure. Description of the Related Art With the development of mobile communication technology, mobile devices have become increasingly common in recent years. Common examples include laptops, mobile phones, multimedia players, and other multifunctional portable electronic devices. To meet user demands, mobile devices typically feature wireless communication capabilities. Some cover long-range wireless communication, such as mobile phones using 2G, 3G, and LTE (Long Term Evolution) systems and their corresponding frequency bands (700 MHz, 850 MHz, 900 MHz, 1800 MHz, 1900 MHz, 2100 MHz, 2300 MHz, and 2500 MHz). Others cover short-range wireless communication, such as Wi-Fi and Bluetooth systems using frequency bands at 2.4 GHz, 5.2 GHz, and 5.8 GHz. Antennas are essential components in wireless communication. If the antenna used for signal reception or transmission has insufficient bandwidth, it can lead to reduced communication quality for mobile devices. Therefore, designing compact and wideband antenna components is an important task for antenna designers. BRIEF SUMMARY OF THE INVENTION In a preferred embodiment, the present disclosure provides an antenna structure, including a feeding adjustment element coupled to a first feeding point; an asymmetrical radiation element coupled to the feeding adjustment element; a first meandering radiation element coupled to a second feeding point; a second meandering radiation element coupled to the second feeding point; a connection radiation element coupled between the first meandering radiation element and the second meandering radiation element, forming a closed loop structure; a first additional radiation element coupled to the connection radiation element and further coupled to the first meandering radiation element, forming a first open slot and a first closed slot; a second additional radiation element coupled to the connection radiation element and further coupled to the second meandering radiation element, forming a second open slot and a second closed slot; and a dielectric substrate. The feeding adjustment element, the asymmetrical radiation element, the first meandering radiation element, the second meandering radiation element, the connection radiation element, the first additional radiation element, and the second additional radiation element are all disposed on the dielectric substrate. In some embodiments, the feeding adjustment element is a variable-width strip. In some embodiments, the feeding adjustment element is disposed between the first meandering radiation element and the second meandering radiation element. In some embodiments, the asymmetrical radiation element includes a rectangular part, a tapered part, and an extension part. The tapered part is coupled between the rectangular part and the extension part. In some embodiments, the extension part of the asymmetrical radiation element is closer to the first meandering radiation element than the second meandering radiation element. In some embodiments, the first meandering radiation element further includes a first edge extension segment, and the second meandering radiation element further includes a second edge extension segment. In some embodiments, the first meandering radiation element is inverted U-shaped for defining a first notch region. In some embodiments, the first additional radiation element extends into the first notch region and is coupled to a first connection point on the first meandering radiation element. In some embodiments, the second meandering radiation element is another inverted U-shape for defining a second notch region. In some embodiments, the second additional radiation element extends into the second notch region and is coupled to a second connection point on the second meandering radiation element. In some embodiments, the combination of the feeding adjustment element, the first meandering radiation element, the second meandering radiation element, the connection radiation element, the first additional radiation element, and the second additional radiation element forms a symmetrical pattern. In some embodiments, the antenna structure covers a low-frequency band and a high-frequency band. The high-frequency band includes a specific frequency, a first frequency interval, a second frequency interval, and a third frequency interval. In some embodiments, the low-frequency band is between 617 MHz and 960 MHz, and the high-frequency band is between 1450 MHz and 5925 MHz. In some embodiments, the specific frequency is approximately 1700 MHz, the first frequency interval is between 2500 MHz and 2700 MHz, the second frequency interval i