US-20260128525-A1 - Antenna Apparatus and Terminal Device

US20260128525A1US 20260128525 A1US20260128525 A1US 20260128525A1US-20260128525-A1

Abstract

An antenna apparatus includes an antenna patch, a feed line, a capacitor, and a ground line. One end of the feed line is connected to the antenna patch. The other end of the feed line is connected to the capacitor in series. One end of the ground line is connected to the antenna patch. The other end of the ground line is configured to connect to the ground plane. The antenna patch and the ground plane remain spaced apart. The antenna patch, the feed line, the capacitor and the ground line are together arranged in a configuration to excite operation modes corresponding to three resonances.

Inventors

Qing Liu
Qi Shi
Qun Guo

Assignees

HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20221020
Priority Date: 20211105

Claims (20)

1 - 13 . (canceled)
14 . An antenna apparatus, comprising: an antenna patch; a capacitor; a feed line, wherein a first end of the feed line is connected to the antenna patch, and wherein a second end of the feed line is connected in series to the capacitor; a feed point connected to the capacitor; and a ground line, wherein a first end of the ground line is connected to the antenna patch, wherein a second end of the ground line is configured to couple with a ground plane, wherein the antenna patch and the ground plane are spaced apart, and wherein the antenna patch, the feed line, the capacitor, and the ground line are configured to excite operation modes corresponding to three resonances to encompass a frequency band of 698 megahertz (MHz) to 1500 MHz.
15 . The antenna apparatus of claim 14 , wherein the antenna patch comprises: a first horizontal radiating metal patch comprising two ends: a first vertical radiating metal patch; and a second vertical radiating metal patch, wherein the first vertical radiating metal patch and the second vertical radiating metal patch are respectively vertically connected to the two ends of the first horizontal radiating metal patch wherein the first vertical radiating metal patch and the second vertical radiating metal patch extend toward the ground plane, wherein the first end of the feed line and the first end of the ground line are connected to the first horizontal radiating metal patch, and wherein the feed line is disposed between the ground line and the first vertical radiating metal patch.
16 . The antenna apparatus of claim 15 , wherein the ground line is connected to a center position of the first horizontal radiating metal patch, and wherein the first vertical radiating metal patch and the second vertical radiating metal patch are symmetrically distributed with respect to a position of the ground line.
17 . The antenna apparatus of claim 15 , wherein the operation modes corresponding to the three resonances are a first common mode, a differential mode, and a second common mode, wherein in the second common mode a local current is sequentially directed through the feed line, a portion of the first horizontal radiating metal patch that is located between the feed line and the first vertical radiating metal patch, and the first vertical radiating metal patch, and wherein a sum of a length of the feed line, a length of the portion of the first horizontal radiating metal patch that is located between the feed line and the first vertical radiating metal patch, and a length of the first vertical radiating metal patch is ¼ of a resonance wavelength of the second common mode.
18 . The antenna apparatus of claim 14 , further comprising a dielectric block connected to the ground plane, the antenna patch, the feed line, and the ground line.
19 . The antenna apparatus of claim 18 , wherein the antenna patch comprises: a second horizontal radiating metal patch; a third vertical radiating metal patch; and a fourth vertical radiating metal patch, wherein the third vertical radiating metal patch and the fourth vertical radiating metal patch are respectively vertically connected to two ends of the second horizontal radiating metal patch, wherein the second horizontal radiating metal patch, the third vertical radiating metal patch, and the fourth vertical radiating metal patch each are attached to a top face of the dielectric block, wherein the feed line and the ground line are each attached to a side face of the dielectric block that is adjacent to the top face, and wherein the first end of the feed line and the first end of the ground line are each connected to the second horizontal radiating metal patch.
20 . The antenna apparatus of claim 19 , wherein a length of the third vertical radiating metal patch is less than a length of the fourth vertical radiating metal patch.
21 . The antenna apparatus of claim 19 , wherein the ground line is connected a first distance from a center position of the second horizontal radiating metal patch, wherein the first distance is in a direction toward the third vertical radiating metal patch.
22 . The antenna apparatus of claim 21 , wherein the first distance is 3 millimeters (mm).
23 . The antenna apparatus of claim 14 , wherein the feed line and the ground line are spaced apart by a preset second distance.
24 . The antenna apparatus of claim 23 , wherein the preset second distance ranges from 6.5 millimeters (mm) to 8 mm.
25 . A terminal device, comprising: an antenna apparatus, comprising: an antenna patch; a capacitor; a feed line, wherein a first end of the feed line is connected to the antenna patch, and wherein a second end of the feed line is connected to the capacitor in series; a feed point connected to the capacitor; and a ground line, wherein a first end of the ground line is connected to the antenna patch, wherein a second end of the ground line is configured to couple with a ground plane, wherein the antenna patch and the ground plane are spaced apart, and wherein the antenna patch, the feed line, the capacitor, and the ground line are configured to excite operation modes corresponding to three resonances to encompass a frequency band of 698 megahertz (MHz) to 1500 MHz.
26 . The terminal device of claim 25 , wherein the antenna patch comprises: a first horizontal radiating metal patch comprising two ends: a first vertical radiating metal patch; and a second vertical radiating metal patch, wherein the first vertical radiating metal patch and the second vertical radiating metal patch are respectively vertically connected to the two ends of the first horizontal radiating metal patch, and wherein the first vertical radiating metal patch and the second vertical radiating metal patch extend toward the ground plane, wherein the first end of the feed line and the first end of the ground line are connected to the first horizontal radiating metal patch, and wherein the feed line is disposed between the ground line and the first vertical radiating metal patch.
27 . The terminal device of claim 26 , wherein the ground line is connected to a center position of the first horizontal radiating metal patch, and wherein the first vertical radiating metal patch and the second vertical radiating metal patch are symmetrically distributed with respect to a position of the ground line.
28 . The terminal device of claim 26 , wherein the operation modes corresponding to the three resonances are a first common mode, a differential mode, and a second common mode, wherein in the second common mode a local current is sequentially directed through the feed line, a portion of the first horizontal radiating metal patch that is located between the feed line and the first vertical radiating metal patch, and the first vertical radiating metal patch, and wherein a sum of a length of the feed line, a length of the portion of the first horizontal radiating metal patch that is located between the feed line and the first vertical radiating metal patch, and a length of the first vertical radiating metal patch is ¼ of a resonance wavelength of the second common mode.
29 . The terminal device of claim 25 , further comprising a dielectric block connected to the ground plane, the antenna patch, the feed line, and the ground line.
30 . The terminal device of claim 29 , wherein the antenna patch comprises: a second horizontal radiating metal patch; a third vertical radiating metal patch; and a fourth vertical radiating metal patch, wherein the third vertical radiating metal patch and the fourth vertical radiating metal patch are respectively vertically connected to two ends of the second horizontal radiating metal patch, wherein the second horizontal radiating metal patch, the third vertical radiating metal patch, and the fourth vertical radiating metal patch each are attached to a top face of the dielectric block, wherein the feed line and the ground line are each attached to a side face of the dielectric block that is adjacent to the top face, and wherein the first end of the feed line and the first end of the ground line are each connected to the second horizontal radiating metal patch.
31 . The terminal device of claim 30 , wherein a length of the third vertical radiating metal patch is less than a length of the fourth vertical radiating metal patch.
32 . The terminal device of claim 30 , wherein the ground line is connected a first distance from a center position of the second horizontal radiating metal patch, wherein the first distance is 3 millimeters (mm) in a direction toward the third vertical radiating metal patch.

Description

This application claims priority to Chinese Patent Application No. 202111304069.X. filed with the China National Intellectual Property Administration on Nov. 5, 2021 and entitled “ANTENNA APPARATUS AND TERMINAL DEVICE”, which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of communication technologies, and in particular, to an antenna apparatus and a terminal device. BACKGROUND With the development of communication technologies, various wireless terminal products are increasingly popular. While enjoying all kinds of conveniences brought by wireless communication devices, the public has a higher requirement for portability of terminals, according to which an antenna is required to integrate an increasing quantity of frequency bands. A bottleneck of antenna design lies in low-frequency bandwidth expansion due to long wavelengths of a low-frequency band and a small terminal size. In conventional technologies, an antenna size is generally increased to expand a low-frequency bandwidth. However, an excessively large antenna size is not conducive to design of dimensions of a terminal product. In addition, in the conventional technologies, an antenna switch is also used to switch an operating status of the antenna to cover the low-frequency bandwidth. However, adding the antenna switch incurs additional costs, and brings other technical problems related to the antenna switch. SUMMARY An objective of this application is to provide an antenna apparatus and a terminal device, to resolve a problem in conventional technologies that an antenna size becomes excessively large to expand a low-frequency bandwidth or costs are incurred by adding an antenna switch to expand a low-frequency bandwidth. According to a first aspect of this application, an antenna apparatus is provided, including an antenna patch, a feed line, a capacitor, and a ground line. One end of the feed line is connected to the antenna patch to feed the antenna patch. The other end of the feed line is connected to the capacitor in series. The capacitor is connected to a feed point of a ground plane. One end of the ground line is connected to the antenna patch. The other end of the ground line is configured to connect to the ground plane. The antenna patch and the ground plane remain spaced apart. The antenna patch, the feed line, and the ground line work together to excite operation modes corresponding to three resonances, to increase a low-frequency bandwidth of the antenna apparatus. According to the antenna apparatus provided in this application, the antenna patch, the feed line, the capacitor, and the ground line may work together, so that the antenna apparatus and the ground plane together form three resonance circuits. In other words, the operation modes corresponding to three resonances are excited. As a result, the antenna apparatus achieves, without any additional component like an antenna switch, a relatively large low-frequency bandwidth that can cover a frequency band of 698 MHz to 1500 MHz. In addition, while good radiation performance is ensured, a structure of the antenna apparatus is simplified and a size of the antenna apparatus is decreased, so that the antenna apparatus is simpler and more compact, and meets a requirement for a miniaturized design. In a possible implementation, the antenna patch includes a first horizontal radiating metal patch, a first vertical radiating metal patch, and a second vertical radiating metal patch. The first vertical radiating metal patch and the second vertical radiating metal patch are respectively vertically connected to two ends of the first horizontal radiating metal patch, and the first vertical radiating patch and the second vertical radiating metal patch extend toward the ground plane. The one end of the feed line and the one end of the ground line that face away from the ground plane each are connected to the first horizontal radiating metal patch, and the feed line is disposed between the ground line and the first vertical radiating metal patch. In this way, an antenna can have good radiation performance, and low-frequency bandwidth expansion is facilitated. In a possible implementation, the ground line is connected to a center position of the first horizontal radiating metal patch, and the first vertical radiating metal patch and the second vertical radiating metal patch are symmetrically distributed with respect to a position of the ground line. This helps the antenna apparatus evenly radiate electromagnetic waves. In a possible implementation, the operation modes corresponding to three resonances are a first common mode, a differential mode, and a second common mode. In the second common mode, a local current is sequentially directed through the feed line, a part that is of the first horizontal radiating metal patch and that is located between the feed line and the first vertical radiating metal patch, and the first vertical radiating m