Antenna system

Abstract

An antenna system includes a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, a fifth radiation element, a sixth radiation element, a seventh radiation element, and a tunable circuit. The first radiation element has a first feeding point. The second radiation element is adjacent to the first radiation element. The third radiation element has a second feeding point. The fourth radiation element is adjacent to the third radiation element. The second radiation element and the fourth radiation element are coupled through the fifth radiation element to the tunable circuit. The tunable circuit provides a variable impedance value according to a control signal. A first antenna structure is formed by the first radiation element, the second radiation element, and the fifth radiation element. A second antenna structure is formed by the third radiation element, the fourth radiation element, the fifth radiation element, the sixth radiation element, and the seventh radiation element.

Claims

1. An antenna system, comprising: A first radiating section having a first feed point; A second radiating part, wherein the second radiating part is adjacent to the first radiating part; A third radiating section having a second feed point; a fourth radiating section, wherein the fourth radiating section is adjacent to the third radiating section; an adjustable circuit coupled to a ground potential, wherein the adjustable circuit provides a variable impedance value according to a control signal; A fifth radiating section, wherein the second and fourth radiating sections are both coupled to the adjustable circuit via the fifth radiating section; a sixth radiating section, coupled to the ground potential, wherein the sixth radiating section is adjacent to the third radiating section; and a seventh radiating section, coupled to the fourth radiating section, wherein the seventh radiating section is adjacent to the second radiating section; wherein the first radiating section, the second radiating section, and the fifth radiating section form a first antenna structure; wherein the third radiating section, the fourth radiating section, the fifth radiating section, the sixth radiating section, and the seventh radiating section form a second antenna structure.

2. The antenna system as described in claim 1, further comprising: A carrier element has a first surface and a second surface opposite to each other, wherein the first radiating portion, the second radiating portion, the third radiating portion, the fourth radiating portion, the fifth radiating portion, and the sixth radiating portion are all disposed on the first surface, and the seventh radiating portion is disposed on the second surface; and a conductive through-element, wherein the seventh radiating portion is coupled to the fourth radiating portion via the conductive through-element.

3. The antenna system as claimed in claim 1, wherein a first coupling gap is formed between the first radiating part and the second radiating part, and the width of the first coupling gap is between 0.15 mm and 4 mm.

4. The antenna system as claimed in claim 1, wherein a second coupling gap is formed between the third radiating part and the fourth radiating part, and the width of the second coupling gap is between 0.15 mm and 4 mm.

5. The antenna system as claimed in claim 1, wherein a third coupling gap is formed between the third radiating part and the sixth radiating part, and the width of the third coupling gap is between 0.15 mm and 1 mm.

6. The antenna system as claimed in claim 1, wherein a fourth coupling gap is formed between the second radiating element and the seventh radiating element, and the width of the fourth coupling gap is between 0.15 mm and 5 mm.

7. The antenna system as claimed in claim 1, wherein the adjustable circuitry includes: A first capacitor is coupled to the ground potential; A second capacitor is coupled to the ground potential; A third capacitor is coupled to the ground potential; A fourth capacitor is coupled to this ground potential; A fifth capacitor is coupled to this ground potential; and a switcher coupled to the fifth radiating section, wherein the switcher switches between the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, and the fifth capacitor according to the control signal.

8. The antenna system as claimed in claim 7, wherein the capacitance of the first capacitor is between 12pF and 18pF, the capacitance of the second capacitor is between 4pF and 7pF, the capacitance of the third capacitor is between 2.5pF and 4pF, the capacitance of the fourth capacitor is between 1.5pF and 2.5pF, and the capacitance of the fifth capacitor is between 0.5pF and 1.5pF.

9. The antenna system as described in claim 7, wherein the adjustable circuitry further comprises: A proximity sensor is coupled to the fifth radiating part, wherein the second radiating part, the fourth radiating part, the fifth radiating part, and the seventh radiating part are all serving as sensing plates of the proximity sensor.

10. The antenna system as claimed in claim 1, wherein the antenna system covers a first frequency band, a second frequency band, a third frequency band, a fourth frequency band, and a fifth frequency band.

11. The antenna system as claimed in claim 10, wherein the first frequency band is between 617 MHz and 960 MHz, the second frequency band is between 1427 MHz and 2690 MHz, the third frequency band is between 3300 MHz and 3980 MHz, the fourth frequency band is between 4200 MHz and 4700 MHz, and the fifth frequency band is between 5150 MHz and 5925 MHz.

12. The antenna system as claimed in claim 10, wherein the first radiating part includes a first branch, a second branch, a third branch, and a fourth branch, and an opening slot is formed between the first branch and the second branch.

13. The antenna system as described in claim 12, wherein the length of the first branch is approximately equal to 0.25 times the wavelength of the second frequency band.

14. The antenna system as described in claim 12, wherein the length of the second branch is approximately equal to 0.25 times the wavelength of the third frequency band.

15. The antenna system as described in claim 12, wherein the length of the third branch is approximately equal to 0.25 times the wavelength of the fourth frequency band.

16. The antenna system as described in claim 12, wherein the length of the fourth branch is approximately equal to 0.25 times the wavelength of the fifth frequency band.

17. The antenna system as claimed in claim 10, wherein the total length of the second radiating element and the fifth radiating element is between 0.125 times and 0.25 times the wavelength of the first frequency band.

18. The antenna system as claimed in claim 10, wherein the third radiating element includes a protruding branch, the length of which is between 0.125 and 0.25 times the wavelength of the fourth frequency band.

19. The antenna system as claimed in claim 10, wherein the total length of the fourth radiating element and the fifth radiating element is between 0.125 times and 0.25 times the wavelength of the second frequency band.

20. The antenna system as claimed in claim 10, wherein the length of the sixth radiating element is between 0.125 times and 0.25 times the wavelength of the fourth frequency band.

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