Antenna system and terminal

• US 10,411,354 B2
• Filed: 01/07/2015
• Issued: 09/10/2019
• Est. Priority Date: 01/23/2014
• Status: Active Grant

• Current Assignee: Honor Device Company Limited
• Original Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhang, Xuefei, Wang, Lei, Feng, Kun, Liu, Chi
• Primary Examiner(s): Dinh, Trinh V
• Application Number:
  US15/113,407
• Publication Number:
  US 20170012357A1
• Time in Patent Office: 1,707 Days
• Field of Search: None
• CPC Class Codes: H01Q 1/241 used in mobile communications, e.g. GSM H01Q1/247, H01Q1/248 take precedence
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 5/328 between a radiating element and ground
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/0442 with particular tuning means
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

An antenna system includes an antenna body, a tunable component, and at least one of a first filter and a second filter. The antenna body is connected to the tunable component. The first filter is connected in parallel to the tunable component, and the first filter presents a high impedance characteristic in a low frequency band, and presents a low impedance characteristic in a high frequency band. The second filter is connected in series between the antenna body and the tunable component, a first end of the second filter is connected to the antenna body, and a second end of the second filter is connected to the tunable component. The second filter presents a low impedance characteristic in a low frequency band, and presents a high impedance characteristic in a high frequency band.

Claims

1. An antenna system, comprising:

an antenna body having one or more connection points between the antenna body and a ground;

a tunable component having a changeable operating parameter that is a capacitance or a inductance, wherein the tunable component comprises a first inductor or a first capacitor, wherein the antenna body is connected to the tunable component; and

a first filter and a second filter, wherein the first filter and the second filter are connected to the antenna body;

wherein the first filter is connected in parallel with the tunable component, wherein a first end of the first filter is connected to the antenna body, and a second end of the first filter is connected to the ground, and wherein the first filter presents a high impedance characteristic in a low frequency band, and presents a low impedance characteristic in a high frequency band; and

wherein the second filter is connected in series between the antenna body and the tunable component, wherein the second filter presents a low impedance characteristic in a low frequency band, and presents a high impedance characteristic in a high frequency band.

2. The antenna system according to claim 1, wherein the first filter is at least one of a single third capacitor or an LC network, wherein the LC network comprises a second inductor and a second capacitor.

3. The antenna system according to claim 1, wherein the antenna system further comprises a parasitic element

wherein the first end of the second filter is connected to the antenna body through the parasitic element;

and

wherein the tunable component is connected to the antenna body through the second filter and the parasitic element in sequence.

4. The antenna system according to claim 3, wherein the second filter is at least one of a single third inductor or an LC network, wherein the LC network comprises a second inductor and a second capacitor.

5. The antenna system according to claim 1, wherein the antenna system further comprises a parasitic element;

wherein a first end of the first filter is connected to the antenna body through the parasitic element;

wherein the first end of the second filter is connected to the antenna body through the parasitic element; and

wherein the tunable component is connected to the antenna body through the second filter and the parasitic element in sequence.

6. The antenna system according to claim 1, wherein the antenna body is at least one of an inverted F antenna (IFA) or a monopole antenna.

7. A terminal, comprising:

an antenna system, comprising

an antenna body having one or more connection points between the antenna body and a ground;

a tunable component having a changeable operating parameter that is a capacitance or a inductance, wherein the tunable component comprises a first inductor or a first capacitor, wherein the antenna body is connected to the tunable component; and

a first filter and a second filter, wherein at the first filter and the second filter are connected to the antenna body;

wherein the first filter is connected in parallel with the tunable component, wherein a first end of the first filter is connected to the tunable component and the second filter, and a second end of the first filter is connected to the ground, and wherein the first filter presents a high impedance characteristic in a low frequency band, and presents a low impedance characteristic in a high frequency band; and

wherein the second filter is connected in series between the antenna body and the tunable component, wherein the second filter presents a low impedance characteristic in a low frequency band, and presents a high impedance characteristic in a high frequency band.

8. The terminal according to claim 7, wherein the first filter is one of a single third capacitor or an LC network, wherein the LC network comprises a second inductor and a second capacitor.

9. The terminal according to claim 7, wherein the antenna system and further comprises a parasitic element;

wherein the first end of the second filter is connected to the antenna body through the parasitic element; and

wherein the tunable component is connected to the antenna body by using the second filter and the parasitic element in sequence.

10. The terminal according to claim 9, wherein the second filter is at least one of a single third inductor or an LC network, wherein the LC network comprises a second inductor and a second capacitor.

11. The terminal according to claim 7, wherein the antenna system comprises further comprises a parasitic element;

wherein a first end of the first filter is connected to the antenna body by using the parasitic element;

wherein the first end of the second filter is connected to the antenna body by using the parasitic element; and

wherein the tunable component is connected to the antenna body by using the second filter and the parasitic element in sequence.

12. The terminal according to claim 7, wherein the antenna body is at least one of an inverted F antenna (IFA) or a monopole antenna.

13. An antenna system, comprising

an antenna body;

a tunable component having a changeable operating parameter that is a capacitance or a inductance, wherein the tunable component comprises a first inductor or a first capacitor;

a parasitic element;

a first filter;

a second filter;

wherein the antenna body is connected to the tunable component through the second filter;

wherein the first filter is connected in parallel to the tunable component, wherein a first end of the first filter is connected to the tunable component, and a second end of the first filter is connected to a ground, and wherein the first filter presents a first impedance property that is high impedance characteristic in a low frequency band, and that is a low impedance characteristic in a high frequency band;

wherein the parasitic element is connected to the antenna body; and

wherein the tunable component and the first end of the first filter are connected to the antenna body through the parasitic element.

14. The antenna system according to claim 13, wherein the antenna system further comprises a second filter;

wherein the second filter is connected in series between the parasitic element and the tunable component;

wherein the tunable component is connected to the antenna body by using the second filter and the parasitic element in sequence; and

wherein the second filter presents a second impedance property that is different from the first impedance property.

15. The antenna system according to claim 14, wherein the first filter is one of a single third capacitor or an LC network, wherein the LC network comprises a second inductor and a second capacitor.

16. The antenna system according to claim 14, wherein the second filter is at least one of a single third inductor or an LC network, wherein the LC network comprises a second inductor and a second capacitor.

17. The antenna system according to claim 14, wherein the antenna body is at least one of an inverted F antenna (IFA) or a monopole antenna.

18. The antenna system according to claim 13, wherein a first end of first capacitor is connected to the ground and a first end of first inductor is connected to the ground, wherein the tunable component comprises a switch component connected between a second end of the first inductor and the body of the antenna body parasitic element, and further connected between a second end of the first capacitor and the body of the antenna body parasitic element, and wherein the switch is configured to, in response to switching of the switch, switch the antenna body between being connected to the first capacitor and the first inductor.