CN206541932U - A kind of double frequency mimo antenna suitable for WLAN - Google Patents

Abstract

The utility model discloses a dual-frequency MIMO antenna structure suitable for a wireless local area network, comprising a dielectric substrate, two antenna element units and two microstrip feeders are printed on the upper surface of the dielectric substrate, and the lower surface of the dielectric substrate A metal ground plate and a T-shaped microstrip line are printed; the structure and size of the two antenna elements are consistent, and they are arranged orthogonally on the upper surface of the dielectric substrate; the metal ground plate is two pieces with The rectangular metal sheets with rectangular notches are connected through a rectangular microstrip line; the T-shaped microstrip line is connected to the middle of the rectangular microstrip line with a gradient line structure. The utility model works in two frequency bands (2.4-2.4853 GHz, 5.15-5.825 GHz) of the wireless local area network, and has wider stopband bandwidth in each frequency band. The antenna of the utility model has many advantages such as small size, low profile, high isolation, easy conformal, convenient manufacture, etc., and can be widely used in wireless local area networks.

Description

A Dual-Band MIMO Antenna Suitable for Wireless Local Area Network

technical field

The utility model relates to the field of wireless communication, in particular to a dual-frequency MIMO antenna suitable for wireless local area networks.

Background technique

With the rapid development of information technology, wireless local area network (WLAN) is widely used in home network and public place network. The common frequency bands of WLAN are 2.4-2.4835GHz and 5.15-5.825GHz frequency bands, so it is necessary to design Antennas with good performance and wide coverage in two frequency bands to meet market demands.

Multiple Receive Multiple Transmitter (MIMO) technology can make full use of space resources, that is, use multiple transmit and receive antennas at the transmitter and receiver to increase spatial freedom, improve frequency band utilization, and improve system performance. MIMO technology has become a research hotspot in the field of wireless communication because it can effectively alleviate the contradiction between limited spectrum resources and unlimited growth of high-speed data demand.

The trend of miniaturization of mobile communication equipment requires antennas to be miniaturized, which further leads to smaller spacing between units of MIMO antennas and smaller isolation, which ultimately affects communication quality.

In a limited space, how to arrange multiple antennas, reduce the coupling strength between multiple antenna units, and improve the isolation between antenna units is the key to improving the performance of the MTMO system.

Contents of the invention

The purpose of the utility model is to provide a dual-band MIMO antenna suitable for wireless local area network with simple structure, low profile, high isolation, low coupling, easy conformal and other advantages.

The technical solution adopted by the utility model to achieve the above purpose is: the dual-band MIMO antenna suitable for wireless local area network includes a dielectric substrate; the upper surface of the dielectric substrate is printed with two antenna element units, two A microstrip feeder line; the lower surface of the dielectric substrate is printed with a metal ground plate and a T-shaped microstrip line; the two antenna elements have the same structure and size, and are arranged orthogonally on the upper surface of the dielectric substrate.

The antenna element unit is connected to the microstrip feeder.

The microstrip feeder has a width of 3 mm and a length of 11 mm.

The metal grounding plate is composed of two rectangular metal sheets and a rectangular microstrip line connecting the two rectangular metal sheets.

The T-shaped microstrip line is connected to the middle part of the rectangular microstrip line with a gradient line structure, and the T-shaped microstrip line can enhance the isolation between the antenna elements.

There is a rectangular notch on the rectangular metal sheet, and the notch is located directly below the microstrip feeder.

The dielectric substrate is a 50mm×50mm FR-4 epoxy glass cloth laminated board with a relative dielectric constant of 4.4, a loss tangent of 0.02, and a thickness of 1.59mm.

The antenna element unit is a combination of "mountain" shape and arrow shape. By adjusting its structural size, the antenna can work simultaneously in two wireless local area network frequency bands of 2.4-2.4835GHz and 5.15-5.825GHz.

A dual-frequency MIMO antenna suitable for wireless local area networks involved in the utility model has many advantages such as low profile, high isolation, low coupling, easy conformal, easy to manufacture, etc., so it is suitable for today's MIMO wireless communication field and has a wide range of advantages. application prospects.

Description of drawings

Fig. 1 is a structural diagram of the utility model;

Fig. 2 is the top view of the utility model

Fig. 3 is the bottom view of the utility model;

Fig. 4 is the graph of reflection coefficient (S11) of the present utility model;

Fig. 5 is the graph of transmission coefficient (S21) of the present utility model;

detailed description

In order to make the technical problems to be solved by the antenna of the utility model clearer, the antenna of the utility model will be further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a schematic diagram of the structure of the antenna of the present invention, and Figs. 2 and 3 are respectively a top view and a bottom view of the antenna of the present invention. The antenna includes a dielectric substrate (2), the upper surface of the dielectric substrate is printed with antenna elements (1, 5) and microstrip feeders (4, 7), and the lower surface of the dielectric substrate is printed with a metal grounding plate (6) and T-shaped microstrip line (3). The antenna elements (1, 5), microstrip feeders (4, 7), T-shaped microstrip lines (3) and metal grounding plates (6) are all symmetrically distributed on the diagonal of the dielectric substrate.

The dielectric substrate (2) of the present utility model is a dielectric constant of 4.4, a loss tangent of 0.02, and a thickness of FR-4 epoxy glass cloth laminated board of 1.59mm, with a length of 50mm and a width of 50mm; The width is 3mm and the length is 11mm; the length of the gradient line of the T-shaped microstrip line is 39mm.

The antenna element unit (1, 5) of the present utility model is a combination of "mountain" shape and arrow shape, and the antenna can work in two wireless local area networks of 2.4-2.4835GHz and 5.15-5.825GHz by adjusting its structural size band.

The metal grounding plate (6) of the present utility model is connected by two rectangular metal sheets through a rectangular microstrip line, and the T-shaped microstrip line (3) is connected to the middle part of the rectangular microstrip line with a gradient line structure .

The T-shaped microstrip line can enhance the isolation between the antenna elements.

In summary, the utility model antenna can work simultaneously in two wireless local area network frequency bands of 2.4-2.4835GHz and 5.15-5.825GHz, and the isolation between the two antenna elements is significantly improved by the T-shaped microstrip line. The antenna has a simple structure, is easy to produce, and has many advantages such as low profile, high isolation, low coupling, easy conformal, and easy fabrication. Therefore, it is suitable for today's MIMO wireless local area network field and has broad application prospects.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modification, equivalent replacement and improvement made within the spirit and principles of the utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (5)

1. A dual-band MIMO antenna suitable for wireless local area network, it comprises a dielectric substrate, two antenna elements and two microstrip feeders are printed on the upper surface of the dielectric substrate, and the lower surface of the dielectric substrate is printed A metal ground plate and a T-shaped microstrip line are made, and the two antenna elements have the same structure and size, and are arranged orthogonally on the upper surface of the dielectric substrate. 2. A dual-band MIMO antenna suitable for wireless local area network according to claim 1, characterized in that: said metal grounding plate is two rectangular metal sheets connected by a rectangular microstrip line. 3. A dual-band MIMO antenna suitable for wireless local area network according to claim 2, characterized in that: said two rectangular metal sheets have rectangular notches directly below said two feeders. 4. A dual-frequency MIMO antenna suitable for wireless local area networks according to claim 2, wherein the T-shaped microstrip line is connected to the middle of the rectangular microstrip line in a gradient line structure. 5. A dual-frequency MIMO antenna suitable for wireless local area network according to claim 1, characterized in that: said antenna element unit is a combination of a "mountain" shape and an arrow shape.