Antenna structure

Abstract

An antenna structure includes: a first radiating section, a second radiating section, a third radiating section, a connecting metal section, an adjustable capacitor, a first capacitor, a second capacitor, and a first inductor. The first radiating section is coupled to a signal source via the first capacitor. The second radiating section is coupled to the first radiating section. The second radiating section is further coupled to a ground potential via the second capacitor. The third radiating section is coupled to the first radiating section. The connecting metal section is coupled to either the first or second radiating section via the first inductor. The adjustable capacitor generates a variable capacitance value according to a first control signal, wherein the connecting metal section is further coupled to a ground potential via the adjustable capacitor.

Claims

1. An antenna structure, comprising: First Radiation Section; A first capacitor, wherein the first radiating portion is coupled to a signal source via the first capacitor; A second radiating portion coupled to the first radiating portion; a second capacitor, wherein the second radiating portion is further coupled to a ground potential via the second capacitor; a third radiating portion coupled to the first radiating portion; a connecting metal portion; a first inductor, wherein the connecting metal portion is coupled to the first radiating portion or the second radiating portion via the first inductor; and an adjustable capacitor, generating a variable capacitance value according to a first control signal, wherein the connecting metal portion is further coupled to the ground potential via the adjustable capacitor; wherein a coupling gap is formed between the connecting metal portion and the third radiating portion, and the width of the coupling gap is between 3 mm and 8 mm.

2. The antenna structure as described in claim 1, further comprising: A proximity sensor; A second inductor is coupled between the connecting metal portion and the adjacent sensor; And a third inductor, wherein the connecting metal portion is further coupled to the ground potential via the third inductor.

3. The antenna structure as described in claim 2, wherein the first radiating part and the third radiating part serve as a sensing plate of the proximity sensor.

4. The antenna structure as described in claim 1, wherein the antenna structure covers a first frequency band, a second frequency band, and a third frequency band.

5. The antenna structure as described in claim 4, further comprising: A fourth radiating part is coupled to the ground potential, wherein the fourth radiating part is adjacent to the third radiating part and the connecting metal part.

6. The antenna structure as described in claim 5 further includes: An adjustable circuit generates a variable impedance value according to a second control signal, wherein the fourth radiating part is further coupled to the ground potential via the adjustable circuit.

7. The antenna structure as described in claim 6, wherein the adjustable circuit includes: A short-circuit path is coupled to this ground potential; A capacitive path is coupled to this ground potential; A first inductive path is coupled to the ground potential; A second inductive path coupled to the ground potential; an open-circuit path coupled to the ground potential; And a switcher coupled to the fourth radiating section, wherein the switcher switches between the short-circuit path, the capacitive path, the first inductive path, the second inductive path, and the open-circuit path according to the second control signal.

8. The antenna structure as described in claim 5, wherein a first coupling gap is formed between the third radiating part and the fourth radiating part, and a second coupling gap is formed between the connecting metal part and the fourth radiating part, wherein the width of the first coupling gap is between 1 mm and 4 mm, and the width of the second coupling gap is between 0.5 mm and 8 mm.

9. The antenna structure as claimed in claim 4, wherein the first frequency band is between 617 MHz and 960 MHz, the second frequency band is between 1400 MHz and 2690 MHz, and the third frequency band is between 3300 MHz and 5925 MHz.

10. The antenna structure as described in claim 4, wherein the total length of the first radiating part and the second radiating part is between 0.125 times and 0.25 times the wavelength of the third frequency band.

11. The antenna structure as described in claim 4, wherein the total length of the first radiating part and the third radiating part is between 0.125 times and 0.25 times the wavelength of the first frequency band.

12. The antenna structure as claimed in claim 4, wherein the length of the connecting metal portion is between 0.0625 times and 0.25 times the wavelength of the first frequency band.

13. The antenna structure as described in claim 5, wherein the length of the fourth radiating element is between 0.0625 times and 0.125 times the wavelength of the first frequency band.

14. The antenna structure as described in claim 1, further comprising: A fifth radiating section is coupled to the first radiating section; A sixth radiating portion coupled to the first radiating portion, wherein the sixth radiating portion is at least partially surrounded by the fifth radiating portion; and a seventh radiating portion coupled to the third radiating portion.

15. The antenna structure as claimed in claim 1, wherein the capacitance value of each of the first capacitor and the second capacitor is between 22pF and 77pF.

16. The antenna structure as described in claim 1, wherein the inductance value of the first inductor is between 12nH and 63nH.

17. The antenna structure as described in claim 2, wherein the inductance value of the second inductor is between 210nH and 450nH.

18. The antenna structure as described in claim 2, wherein the inductance value of the third inductor is between 57nH and 270nH.

19. An antenna structure, comprising: A first radiating section is coupled to a signal source; A second radiating part is coupled to the first radiating part; A third radiating portion coupled to the first radiating portion, wherein the second and third radiating portions extend in substantially opposite directions; a fourth radiating portion coupled to a ground potential, wherein the fourth radiating portion is adjacent to the third radiating portion; a connecting metal portion; a first inductor, wherein the connecting metal portion is coupled to the first radiating portion via the first inductor; and an adjustable capacitor that generates a variable capacitance value according to a first control signal, wherein the connecting metal portion is further coupled to the ground potential via the adjustable capacitor.

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