Antenna and terminal

Patent metadata

Field	Value
Publication number	US-10283864-B2
Application number	US-201615186123-A
Country	US
Kind code	B2
Filing date	Jun 17, 2016
Priority date	Dec 20, 2013
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

The present invention discloses an antenna and a terminal, which can extend antenna bandwidth. The antenna includes a capacitor component and at least one radiator, where one end of each radiator of the at least one radiator is connected to form a first node, the first node is connected to one end of the capacitor component to form a second node, and the second node is grounded; and the other end of the capacitor component receives a feed signal.

First claim

What is claimed is:

1. An antenna comprising a capacitor component, a plurality of radiators, a ground cable, and a first matching circuit, wherein:
the plurality of radiators comprises a first radiator and a second radiator;
one end of the first radiator is connected at a first node to one end of the second radiator, one end of the capacitor component is connected at a second node, the first node is connected to the second node, and the second node is grounded with the ground cable;
the grounded cable comprises a ground end of the antenna, and the grounded cable comprises a distributed inductor;
the other end of the capacitor component receives a feed signal, and is connected to one end of the first matching circuit at a third node, and the other end of the capacitor component receives the feed signal by using the first matching circuit;
the first matching circuit and the capacitor component comprise a signal feed end of the antenna, and the first matching circuit comprises an inductor or a capacitor;
the second node is where the ground end, the signal feed end, and the plurality of radiators are connected to one another; and
the signal feed end and the ground end operably generates a low-frequency resonance frequency with the capacitor component and the distributed inductor of the ground cable, and the plurality of radiators operably generate a plurality of high-frequency resonance frequencies that are higher than the low-frequency resonance frequency.

2. The antenna according to claim 1 , wherein the antenna further comprises a tunable circuit in the ground end of the antenna, one end of the tunable circuit is connected at a fourth node, the fourth node is connected to the second node, and the second node is grounded by using the tunable circuit; and
wherein the tunable circuit is capacitive or inductive.

3. The antenna according to claim 2 , wherein the tunable circuit is second matching circuit or a filter.

4. The antenna according to claim 2 , wherein the tunable circuit is a single-pole double-throw switch, wherein a movable end of the single-pole double-throw switch serves as the one end of the tunable circuit at the fourth node, one immovable end of the single-pole double-throw switch serves as a grounding end of the tunable circuit, and another immovable end of the single-pole double-throw switch is free.

5. The antenna according to claim 2 , wherein the tunable circuit comprises a third matching circuit, a fourth matching circuit, and a single-pole double-throw switch, wherein:
a movable end of the single-pole double-throw switch serves as the one end of the tunable circuit at the fourth node;
one end of the third matching circuit is connected to a first immovable end of the single-pole double-throw switch, and one end of the fourth matching circuit is connected to a second immovable end of the single-pole double-throw switch; and
the other end of the third matching circuit is connected to the other end of the a fourth matching circuit at a fifth node, and the fifth node serves as a grounding end of the tunable circuit.

6. The antenna according to claim 2 , wherein the tunable circuit comprises an input capacitor, a low-frequency capacitor, a high-frequency capacitor, and a single-pole double-throw switch, wherein:
one end of the input capacitor is connected to a movable end of the single-pole double-throw switch, and the other end of the input capacitor serves as the one end of the tunable circuit at the fourth node; and
one end of the low-frequency capacitor is connected to a first immovable end of the single-pole double-throw switch, one end of the high-frequency capacitor is connected to a second immovable end of the single-pole double-throw switch, the other end of the low-frequency capacitor is connected to the other end of the high-frequency capacitor at a sixth node, and the sixth node serves as a grounding end of the tunable circuit.

7. The antenna according to claim 1 , wherein the capacitor component comprises an interdigital capacitor or a variable capacitor.

8. The antenna according to claim 1 , wherein the antenna is set in a terminal.

9. The antenna according to claim 1 , wherein the capacitor component and the first matching circuit are connected in series with a signal feeder, with the first matching circuit between the capacitor component and the signal feeder, wherein the feed signal is received by the capacitor component from the signal feeder, after the feed signal passes through the first matching circuit.

10. The antenna according to claim 1 , further comprising a third radiator, wherein one end of the third radiator is connected to the one end of the first radiator and to one end of the second radiator at the first node;
wherein the plurality of high-frequency resonance frequencies comprises a first high-frequency resonance frequency operably generated by the first radiator, a second high-frequency resonance frequency operably generated by the second radiator, and a third high-frequency resonance frequency operably generated by the third radiator.

11. The antenna according to claim 1 , further comprising a fifth matching circuit, wherein one end of the fifth matching circuit is connected to the one end of the first matching circuit at the third node.

12. An antenna, comprising:
a variable capacitor (VAC) with a first VAC terminal and a second VAC terminal;
a plurality of radiators comprising a first radiator with a first radiator terminal, and a second radiator with a second radiator terminal;
a matching circuit with a first matching terminal, wherein the matching circuit comprises an inductor or a capacitor that is different from the VAC, wherein the matching circuit and the VAC comprise a signal feed end of the antenna; and
a ground cable that comprises a ground end of the antenna, wherein the ground end is a different end than the signal feed end, and wherein the ground cable comprises a distributed inductor;
wherein the first VAC terminal is connected to the first matching terminal, and the first VAC terminal operably receives a feed signal by using the matching circuit;
wherein the second VAC terminal has a first connection to the first radiator terminal, a second connection to the ground cable that grounds the second VAC terminal, and a third connection to the plurality of radiators, so that the signal feed end, the ground end and the plurality of radiators are connected to one another at the second VAC terminal; and
wherein a low-frequency resonance frequency is operably generated with the distributed inductor in the ground end, and the VAC in the signal feed end, and a plurality of high-frequency resonance frequencies that are higher than the low-frequency resonance frequency, are operably generated with the plurality of radiators.

13. The antenna according to claim 12 , wherein the first radiator terminal is connected to the second VAC terminal through a first node and a second node;
wherein the first node is connected to the second node;
wherein the second connection of the second VAC terminal to the ground cable is also at the second node, so that the ground end, the signal feed end, and the plurality of radiators are connected to one another at the second node; and
wherein the matching circuit is connected to the first VAC terminal at a third node.

14. The antenna according to claim 13 , further comprising an additional matching circuit with an additional matching terminal connected to the first matching terminal at the third node.

15. The antenna according to claim 13 , further comprising an third radiator with a third radiator terminal connected

Assignees

• Huawei Device Co Ltd
• Huawei Device Dongguan Co Ltd

Inventors

• Li Jianming
• Wang Hanyang
• Feng Kun
• Zhang Xiaoju

Classifications

• H01Q5/335

  at the feed, e.g. for impedance matching · CPC title

• H01Q9/0421 Primary

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

• H01Q1/48

  Earthing means; Earth screens; Counterpoises · CPC title

• H01Q5/328 Primary

  between a radiating element and ground · CPC title

• H04M1/026

  Details of the structure or mounting of specific components · CPC title