EP3190660A2

EP3190660A2 - Mimo antenna and wireless device

Info

Publication number: EP3190660A2
Application number: EP17171627.7A
Authority: EP
Inventors: Cheng-Hung Ko
Original assignee: Sercomm Corp
Current assignee: Sercomm Corp
Priority date: 2016-10-24
Filing date: 2017-05-18
Publication date: 2017-07-12
Also published as: CN206163692U; EP3190660A3

Abstract

A multiple-input-multiple-output (MIMO) antenna (10) includes a first radiating element (12a) connecting to a first feed-in element; a second radiating element (12b) connecting to a second feed-in element; and a connecting element (16) connected to the first radiating element (12a), the second radiating element (12b) and a grounding component, configured to provide a grounding-current path from the first radiating element (12a) and the second radiating element (12b) to the rounding component.

Description

Field of the Invention

The present creation relates to a MIMO antenna and a wireless device, and more particularly, to a MIMO antenna and a wireless device with high isolation.

Background of the Invention

As information technology and the Internet become more popular, people demand a higher transmission rate of a wireless access point(AP). Deployment methods of access points in current market are various, which may be upright standing (on table), lyingflat, ceiling or wall mounting, etc. A wireless AP may be equipped with a multiple-input-multiple-output (MIMO) antenna to enhance the transmission rate. However, the transmission rate of the wireless AP is limited by the isolation of the MIMO antenna. Therefore, how to enhance isolation of an MIMO antenna is a significant objective in the field.

Summary of the Invention

It is therefore an objective of the present creation to provide a MIMO antenna and a wireless device, to improve over disadvantages of the prior art.
The present creation discloses a MIMO antenna comprising a first radiating element with a terminal connected to a first feed-in element; a second radiating element with a terminal connected to a second feed-in element and another terminal connected to the first radiating element; and a connecting element, connected to the first radiating element, the second radiating element and a grounding component, configured to provide a grounding-current path from the first radiating element and the second radiating element to the grounding component.
The present creation further discloses a wireless devicecomprising a printed circuit board (PCB); a MIMO antenna, disposed on an edge side of the PCB, the MIMO antenna comprising a first radiating element, with a terminal connected to a first feed-in element; a second radiating element, with a terminal connected to a second feed-in element and another terminal connected to the first radiating element; and a connecting element, connected to the first radiating element, the second radiating element and a grounding component, configured to provide a grounding-current path from the first radiating element and the second radiating element to the grounding component.

Brief Description of the Drawings

FIG. 1 is a schematic diagram of a MIMO antenna according to an embodiment of the present creation.
FIG. 2 is a schematic diagram of a MIMO antenna according to an embodiment of the present creation.
FIG. 3 is a schematic diagram of current distribution of the MIMO antenna of FIG. 2.
FIG. 4 is a schematic diagram of a MIMO antenna according to an embodiment of the present creation.
FIG. 5 is a schematic diagram of a wireless device according to an embodiment of the present creation.

Detailed Description

Please refer to FIG. 1, which is a schematic diagram of a MIMO antenna10 according to an embodiment of the present creation. The MIMO antenna 10 comprises a first radiating element 12a, a second radiating element 12b and a connecting element 16. As shown in FIG. 1, a terminal of the first radiating element 12a is connected to a first feed-in element 14a, and another terminal is connected to the second radiating element 12b and the connecting element 16. A terminal of the second radiating element 12b is connected to a second feed-in element 14b, and another terminal is connected to the first radiating element 12a and the connecting element 16. In other words, the first radiating element 12a, the second radiating element 12b and the connecting element 16 are interconnected, and the connecting element 16 is further connected to a grounding component 18, configured to provide a grounding-current path ph_g from the first radiating element 12a and the second radiating element 12b to the grounding component 18.
Specifically, the first radiating element 12a may be regarded/divided as a first segment 120a and a second segment 122a, and the second radiating element 12bmay be regarded/divided as a third segment 120b and a fourth segment 122b. The first segment 120a of the first radiating element 12a and the third segment 120b of the second radiating element 12b are connected to each other, and the connecting element 16 is connected to the first segment 120a of the first radiating element 12a and the third segment 120b of the second radiating element 12b. In addition, the first radiating element 12a forms a first bend between the first segment 120a and the second segment 122a; and the second radiating element 12b forms a second bend between the third segment 120b and the fourth segment 122b. The first radiating element 12a extends from the first bend toward the second radiating element 12b, and is connected to the second radiating element 12b; the second radiating element 12b extends from the second bend toward the first radiating element 12a, and is connected to the first radiating element 12a. In addition, a first length of the first radiating element 12a should be a quarter wavelength of a first wireless signal to be transmitted or received, and a second length of the second radiating element 12b should be a quarter wavelength of a second wireless signal to be transmitted or received, where the first wireless signal and the second wireless signal may have the same wavelengths.
In such a structure, the first segment 120a and the second segment 122a of the first radiating element 12a along with the connecting element 16 may form a first current path ph_a. The third segment 120b and the fourth segment 122b of the second radiating element 12b along with the connecting element 16 may form a second current path ph_b, where the first current path ph_a and the second current path ph_b are both through the grounding-current path ph_g to the grounding component 18. In addition, as shown in FIG. 1, the first current path ph_a is substantially in a counterclockwise direction, and the second current path ph_b is substantially in a clockwise direction. That is, the first current path ph_a and the second current path ph_b have opposite rotation directions.
Notably, the MIMO antenna 10 may form the first current path ph_a and the second current path ph_b, and use the common connecting element 16 so as to provide the grounding-current path ph_g to the grounding component 18. Therefore, an isolation of the MIMO antenna 10 is enhanced, and the antenna transmission efficiency is improved.
In an embodiment, the first segment 120a of the first radiating element 12a and the third segment 120b of the second radiating element 12b may substantially be parallel to an edge of the grounding component 18, and the second segment 122a of the first radiating element 12a, the fourth segment 122b of the second radiating element 12b and the connecting element 16 may substantially be perpendicular to the edge of the grounding component 18. Therefore, the first current path ph_a is substantially formed to be in the counterclockwise direction, and the second current path ph_b is substantially formed to be in the clockwise direction.
Notably, the MIMO antenna of the present creation is not limited to have the shape illustrated in FIG. 1. For example, please refer to FIG. 2, which is a schematic diagram of a MIMO antenna20 according to an embodiment of the present creation.The MIMO antenna 20 comprises a first radiating element 22a, a second radiating element 22b, a connecting element 26, a first feed-in element 24a, a second feed-in element 24b and a grounding component 28, which are corresponding to the first radiating element 12a, the second radiating element 12b, the connecting element 16, the first feed-in element 14a, the second feed-in element 14b and the grounding component 18 of the MIMO antenna 10, respectively. Operational principles of the MIMO antenna 20 are similar to which of the MIMO antenna 10, and not narrated herein for brevity. The current formed by the MIMO antenna 20 may be referred to FIG. 3. As can be seen from FIG. 3, the current path of the MIMO antenna 20includes a clockwise direction and a counterclockwise direction. Thereby, the MIMO antenna 20 may have good isolation, and the antenna transmission efficiency is improved.
In addition, the MIMO antenna of the present creation is not limited to be 2-dimensional antenna shown in FIG. 1. The MIMO antenna of the present creation may be a 3-dimensional (3D) antenna. Please refer to FIG. 4, which is a schematic diagram of a MIMO antenna 40 according to an embodiment of the present creation. The MIMO antenna 40 is similar to the MIMO antenna 10, and thus, same components are denoted by the same symbols. Different from the MIMO antenna 10, a first radiating element 42a and a second radiating element 42b comprised in the MIMO antenna 40 are radiating elements with 3D structure. The MIMO antenna 40 also may form current paths with opposite rotation directions and through the connecting element 16, to provide the grounding-current path to the grounding component 18, which is also within the scope of the present creation.
In another perspective, the MIMO antenna of the present creation may be applied in a wireless device. FIG. 5 is a schematic diagram of a wireless device 50 according to an embodiment of the present creation.The wireless device 50 may be a wireless access point (AP), a wireless router, a wireless IP (Internet Protocol) sharer, a small cell, or a Wi-Fi station. The wireless device 50 comprises a printed circuit board PCB and a MIMO antenna ANT. The MIMO antenna ANT may be realized by the MIMO antennas 10, 20, 40. The MIMO antenna ANT may be disposed on an edge of the printed circuit board PCB and coupled to the printed circuit board PCB.
In addition,the MIMO antenna of the present creation may, but not limited to, be manufactured by printed circuit board, FPC (flexible print circuit), iron sheets, or a laser direct structuring (LDS) manufacture process. In addition, besides Wi-Fi systems, the wireless device of the present creation may also to applied in systems such as Bluetooth, Zigbee, Z-wave, DECT (Digital Enhanced Cordless Telecommunications), LTE (Long Term Evolution), 3G/4G/5G wireless or mobile communication systems, and not limited thereto.
In summary, the MIMO antenna of the present creation forms the current paths with the opposite rotation directions, and utilizes the common connecting elementto provide the grounding-current path to the grounding component.Therefore, isolation of the MIMO antenna is enhanced, and the antenna transmission efficiency is improved.
The above description is only the creation of a preferred embodiment, where the creation of applications for patents under this scope of equalization changes and modifications made, also belong to the scope of this creation.

Claims

A multiple-input-multiple-output (MIMO) antenna (10), characterised by comprising:
a first radiating element (12a), with a terminal connected to a first feed-in element (14a);

a second radiating element (12b), with a terminal connected to a second feed-in element (14b) and another terminal connected to the first radiating element (12a); and

a connecting element (16), connected to the first radiating element (12a), the second radiating element (12b) and a grounding component, the connecting element (16) configured to provide a grounding-current path from the first radiating element (12a) and the second radiating element (12b) to the grounding component.
The MIMO antenna of claim 1, characterized in that the first radiating element (12a) comprises a first bend, the second radiating element (12b) comprises a second bend, the first radiating element (12a) extends from the first bend toward the second radiating element (12b), and the second radiating element (12b) extends from the second bend toward the first radiating element (12a).
The MIMO antenna of claim 1, characterized in that the first radiating element (12a) and the connecting element (16) forms a first current path, the second radiating element (12b) and the connecting element (16) forms a second current path, and the first current path and the second current path have opposite rotation directions.
The MIMO antenna of claim 3, characterized in that the first current path and the second current path are through the grounding-current path to the grounding component.
The MIMO antenna of claim 1, characterized in that a first length of the first radiating element (12a) is a quarter wavelength of a first wireless signal; a second length of the second radiating element (12b) is a quarter wavelength of a second wireless signal.
A wireless device, characterized by comprising:
a printed circuit board (PCB);

a multiple-input-multiple-output (MIMO) antenna, disposed on an edge side of the PCB, the MIMO antenna comprising:
a first radiating element (12a), with a terminal connected to a first feed-in element;

a second radiating element (12b), with a terminal connected to a second feed-in element and another terminal connected to the first radiating element (12a); and

aconnecting element (16), connected to the first radiating element (12a), the second radiating element (12b) and a grounding component, the connecting element (16) configured to provide a grounding-current path from the first radiating element (12a) and the second radiating element (12b) to the grounding component.
The wireless device of claim 6, characterized in that the first radiating element (12a) comprises a first bend, the second radiating element (12b) comprises a second bend, the first radiating element (12a) extends from the first bend toward the second radiating element (12b), and the second radiating element (12b) extends from the second bendtowardthe first radiating element (12a).
The wireless device of claim 6, characterized in that the first radiating element (12a) and the connecting element (16) forms a first current path, the second radiating element (12b) and the connecting element (16) forms a second current path, and the first current path and the second current path have opposite rotation directions.
The wireless device of claim 8,characterized in that the first current path and the second current path are through the grounding-current path to the grounding component.
The wireless device of claim 6, characterized in that a first length of the first radiating element (12a) is a quarter wavelength of a first wireless signal; a second length of the second radiating element (12b) is a quarter wavelength of a second wireless signal.