Microstrip antenna and electronic device

Patent metadata

Field	Value
Publication number	US-12586909-B2
Application number	US-202218575561-A
Country	US
Kind code	B2
Filing date	Jun 28, 2022
Priority date	Jun 30, 2021
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

A microstrip antenna includes a radiator and a first feed and a second feed that are configured to feed a radio frequency signal, and a first feedpoint and two second feedpoints are disposed on the radiator. The first feedpoint is located at a central position of the radiator, and the first feedpoint is electrically connected to the first feed, and is configured to feed a radio frequency signal into the radiator, to excite the radiator to generate a TM 02 mode. The two second feedpoints deviate from the central position of the radiator and are spaced apart from the first feedpoint. The second feed is electrically connected to the second feedpoints through an adjustment circuit. The second feedpoints are configured to feed a radio frequency signal into the radiator, and the second feedpoints excite, by using the adjustment circuit, the radiator to generate a TM 10 mode.

First claim

What is claimed is:

1 . A microstrip antenna, disposed in an electronic device, the microstrip antenna comprising:
a radiator; and a first feed and a second feed, wherein a first feedpoint and two second feedpoints are disposed on the radiator, the first feedpoint is located at a central position of the radiator and is electrically connected to the first feed, the first feedpoint is configured to feed a first radio frequency signal into the radiator to excite the radiator to generate a TM 02 mode, and wherein the two second feedpoints are spaced apart from the first feedpoint, the second feed is electrically connected to the second feedpoints through an adjustment circuit, the second feedpoints are configured to feed a second radio frequency signal into the radiator, and the second feedpoints are configured to excite the radiator to generate a TM 10 mode through the adjustment circuit to perform as a dual-microstrip antenna.

2 . The microstrip antenna according to claim 1 , wherein the first feedpoint is configured to feed the first radio frequency signal into the radiator in a centrosymmetric feeding manner and generate a current in a first direction on the radiator, and the two second feedpoints are configured to feed the second radio frequency signal into the radiator in a distributed feeding manner and generate a current in a second direction on the radiator, wherein the first direction is perpendicular to the second direction.

3 . The microstrip antenna according to claim 2 , wherein the radiator is rectangular, a size of the radiator in the first direction is three quarters to five quarters of a wavelength of an operating frequency band of the microstrip antenna, and a size of the radiator in the second direction is three eighths to five eighths of the wavelength of the operating frequency band of the microstrip antenna, wherein the first direction is a length direction of the radiator, and the second direction is a width direction of the radiator.

4 . The microstrip antenna according to claim 3 , wherein the size of the radiator in the second direction is a half of the size of the radiator in the first direction.

5 . The microstrip antenna according to claim 2 , wherein the adjustment circuit comprises: a second capacitor, a third capacitor, and a microstrip that are electrically connected to the radiator, the second capacitor and the third capacitor are spaced apart in the second direction, the second capacitor and the third capacitor are electrically connected to the second feedpoints, a straight-line length of the microstrip is a half of a wavelength of an operating frequency band of an antenna provided by the second feedpoints and the radiator, and the microstrip is connected between the second capacitor and the third capacitor and generates a 180-degree phase difference.

6 . The microstrip antenna according to claim 5 , wherein capacities of both the second capacitor and the third capacitor are 0.6 pF, and impedance of the microstrip is 50 ohms.

7 . The microstrip antenna according to claim 2 , wherein the adjustment circuit comprises a balanced/unbalanced converter, and the balanced/unbalanced converter is connected to the radiator and the second feedpoints to have a 180-degree phase difference.

8 . The microstrip antenna according to claim 2 , wherein the adjustment circuit comprises a phase shifter, and the phase shifter is connected to the radiator and the second feedpoints to have a 180-degree phase difference.

9 . The microstrip antenna according to claim 2 , wherein:
the two second feedpoints and the first feedpoint are disposed side by side in the second direction, and the two second feedpoints are distributed on two opposite sides of the first feedpoint symmetrically with respect to the first feedpoint; or the two second feedpoints are offset relative to the central position of the radiator in both the first direction and the second direction, and the two second feedpoints pass through the first feedpoint along a symmetry axis in the first direction.

10 . The microstrip antenna according to claim 9 , wherein the two second feedpoints are offset relative to the central position of the radiator in both the first direction and the second direction and are spaced apart from the first feedpoint, and the second feedpoints are further configured to feed a third radio frequency signal into the radiator to excite the radiator to generate a TM 01 mode and a TM 11 mode.

11 . The microstrip antenna according to claim 2 , wherein a first matching circuit is connected between the first feedpoint and the first feed, the first matching circuit comprises a first capacitor and a first inductor that are connected in series, and wherein:
the first capacitor is electrically connected to the first feedpoint, and the first inductor is electrically connected to the first feed; or the first matching circuit comprises a first inductor, and the first inductor is electrically connected to the first feed and the first feedpoint.

12 . The microstrip antenna according to claim 2 , wherein the microstrip antenna further comprises a third feedpoint, a third feed, and a third matching circuit, the third feedpoint is disposed on the radiator, deviates from the central position of the radiator in the first direction, and is spaced apart from the first feedpoint, the third matching circuit is electrically connected to the third feedpoint and the third feed, and the third feedpoint is configured to feed a fourth radio frequency signal into the radiator, to excite the radiator to generate a TM 01 mode.

13 . The microstrip antenna according to claim 12 , wherein the third matching circuit comprises a third inductor, wherein a first end of the third inductor is electrically connected to the third feed, and a second end of the third inductor is electrically connected to the third feedpoint, and wherein the third matching circuit is configured to feed a signal into the radiator through the third feedpoint.

14 . The microstrip antenna according to claim 12 , wherein the third feedpoint is located at a central position of the radiator in the second direction.

15 . The microstrip antenna according to claim 2 , wherein a first through groove is provided in the radiator, a length of the first through groove extends in the second direction, and the first through groove is provided in the first direction and spaced apart from the first feedpoint.

16 . The microstrip antenna according to claim 15 , wherein a second through groove is provided in the radiator, and the first and second through grooves are symmetrically disposed with respect to a center of the radiator.

17 . The microstrip antenna according to claim 15 , wherein a first electrical length of the radiator in the first direction is equal to a wavelength of an operating frequency band of the microstrip antenna, and a second electrical length of the radiator in the second direction is a half of the wavelength of the operating frequency band of the microstrip antenna.

18 . The microstrip antenna according to claim 2 , wherein the second feedpoints are located at a central position of the radiator in the first direction.

19 . The microstrip antenna according to claim 1 , wherein an operating frequency band of the TM 02 mode is the same as an operating frequency band of the TM 10 mode.

20 . An electronic device, wherein the electronic device comprises:
a circuit board; and a microstrip antenna, comprising:
a radiator electrically connected to the cir

Assignees

• Huawei Tech Co Ltd

Inventors

• Shi Chuanbo
• Wang Hanyang
• Wu Pengfei
• Hou Meng

Classifications

• H01Q1/242

  specially adapted for hand-held use · CPC title

• H01Q5/35

  using two or more simultaneously fed points · CPC title

• H01Q5/364

  Creating multiple current paths · CPC title

• H01Q9/045 Primary

  with particular feeding means (for circular polarisation H01Q9/0428) · CPC title

• H01Q1/22

  by structural association with other equipment or articles · CPC title