Antenna system and terminal

Patent metadata

Field	Value
Publication number	US-11949172-B2
Application number	US-201916528919-A
Country	US
Kind code	B2
Filing date	Aug 1, 2019
Priority date	Jan 23, 2014
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

An antenna system includes 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 antenna body is connected to the tunable component through a first connection point; and a first filter, wherein the first 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 through the first connection point, 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.

First claim

What is claimed is:

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 changeable, by a switch of the tunable component, between a capacitance and an inductance; and
a second filter, wherein the antenna body is connected to the second filter through a first connection point;
wherein the second filter is connected in series between the antenna body and the tunable component in a manner that 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, and 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; and
wherein the second filter is connected to the ground through the tunable component.

2. The antenna system according to claim 1 , wherein the tunable component comprises an inductor and a capacitor.

3. The antenna system according to claim 1 , wherein the second filter is at least one of an inductor or an inductive-capacitive (LC) network comprising an inductor and a capacitor.

4. 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.

5. 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.

6. The antenna system according to claim 1 , wherein:
the antenna system further comprises a first filter;
the first filter is directly connected to the antenna body;
the first filter is connected in parallel with the tunable component;
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.

7. The antenna system according to claim 6 , wherein the first filter is at least one of a capacitor or an inductive-capacitive (LC) network comprising an inductor and a capacitor.

8. The antenna system according to claim 6 , wherein one ground point is connected to the antenna body through the first connection point, and in parallel with the tunable component and the first filter.

9. The antenna system according to claim 6 , wherein the antenna system is configured to limit, due to high impedance of the first filter, a radio frequency current at the first connection point to passing through the tunable component branch when the antenna system operates in the low frequency band; and
wherein the antenna system is further configured, when the antenna system operates in the high frequency band, to effectively connect the radio frequency current to a ground point mainly through the first filter due to low impedance of the first filter.

10. The antenna system according to claim 1 , wherein the antenna system further comprises an excitation point for connecting to a signal, and one or more ground points.

11. The antenna system according to claim 1 , wherein one ground point is connected to the antenna body through the first connection point and in parallel with the tunable component.

12. A terminal, comprising the antenna system of claim 1 .

13. The antenna system according to claim 1 , wherein the antenna system is configured to connect a radio frequency current at the first connection point to the tunable component when the antenna system operates in the low frequency band such that the radio frequency current is unaffected by the second filter; and
wherein the antenna system is further configured to block, when the antenna system operates in the high frequency band, connection of the radio frequency current to the tunable component due to the high impedance characteristic of the second filter.

14. An antenna system, comprising
an antenna body;
a tunable component having a changeable operating parameter that is changeable, by a switch of the tunable component, between a capacitance and an inductance, wherein the antenna body is connected to the tunable component through a first connection point;
a parasitic element; and
a second filter, wherein:
the antenna body is connected to the second filter through the first connection point;
the second filter is connected in series between the antenna body and the tunable component in a manner that 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;
the second end of the second filter is connected to ground through the tunable component;
the parasitic element is connected to the antenna body; and
the first end of the second filter is connected to the antenna body through the parasitic element.

15. The antenna system according to claim 14 , wherein:
the antenna system further comprises a first filter;
the first filter is connected in parallel to the tunable component;
a first end of the first filter is connected to the second filter;
a second end of the first filter is connected to a ground; and
the first filter presents a first impedance property that is the high impedance characteristic in the low frequency band, and that is the low impedance characteristic in the high frequency band.

16. The antenna system according to claim 15 , wherein the antenna system is configured to limit, due to high impedance of the first filter, a radio frequency current at the first connection point to passing through the tunable component branch when the antenna system operates in the low frequency band; and
wherein the antenna system is further configured, when the antenna system operates in the high frequency band, to effectively connect the radio frequency current to a ground point through the first filter due to low impedance of the first filter.

17. The antenna system according to claim 14 , wherein the antenna system is configured to connect a radio frequency current at the first connection point to the tunable component when the antenna system operates in the low frequency band such that the radio frequency current is unaffected by the second filter; and
wherein the antenna system is further configured to block, when the antenna system operates in the high frequency band, connection of the radio frequency current to the tunable component due to the high impedance characteristic of the second filter.

Assignees

• Honor Device Co Ltd

Inventors

• Zhang Xuefei
• Wang Lei
• Feng Kun
• Liu Chi

Classifications

• H01Q9/0421 Primary

  with a shorting wall or a shorting pin at one end of the element (H01Q9/0414 takes precedence) · CPC title

• H01Q1/241

  used in mobile communications, e.g. GSM (H01Q1/247, H01Q1/248 take precedence) · CPC title

• H01Q1/243

  with built-in antennas · CPC title

• H01Q5/328

  between a radiating element and ground · CPC title

• H01Q5/378

  Combination of fed elements with parasitic elements · CPC title