CN217881913U

CN217881913U - Two-port MIMO antenna suitable for Bluetooth and ultra-wideband communication

Info

Publication number: CN217881913U
Application number: CN202222155407.4U
Authority: CN
Inventors: 吴玲
Original assignee: Hubei Engineering University
Current assignee: Hubei Engineering University
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-11-22
Anticipated expiration: 2032-08-16

Abstract

The utility model discloses a two port MIMO antennas suitable for bluetooth and ultra wide band communication, including the medium base plate, still including setting up at the positive antenna element of medium base plate, the antenna element includes radiating element and microstrip line, radiating element and microstrip line connection, the center of radiating element is crossed to the extension line of microstrip line, the positive base of microstrip line perpendicular to medium base plate, the bottom of microstrip line extends to the positive base of medium base plate and regards as connection port, the medium base plate back is provided with the metal floor of rectangle, the base on metal floor aligns and length unanimous with medium base plate back base, the topside etching on metal floor has the type of falling T groove, the type of falling T groove corresponds with the microstrip line position. Compared with the prior art, the utility model, not only improved antenna unit's isolation, reduced minimum working frequency section to 2.4GHz moreover for can work in bluetooth and UWB frequency channel.

Description

Two-port MIMO antenna suitable for Bluetooth and ultra-wideband communication

Technical Field

The utility model belongs to the technical field of the antenna, concretely relates to two port MIMO antennas suitable for bluetooth and ultra wide band communication.

Background

UWB technology differs from ordinary communication technology in that it does not use a carrier wave for communication, but transmits data by transmitting a very narrow pulse in the order of nanoseconds or even picoseconds. Therefore, compared with the conventional communication technology, the UWB technology has many advantages, such as: wide frequency band (3.1-10.6 GHz), high speed, low power consumption, etc. These advantages make UWB technology the mainstream of short-range communication technology. UWB technology is also known as green communication because its transmission power is very low than 1 milliwatt.

Bluetooth is a special wireless technology connection technology that establishes a communication environment for fixed and mobile devices, based on low-cost short-range wireless connections (typically within 10 m). Bluetooth technology enables some current portable mobile devices and computer devices to connect to the internet without a cable and to access the internet wirelessly. The technology enables short-distance wireless information exchange among a plurality of devices including mobile phones, PDAs, wireless headsets, notebook computers, related peripherals and the like. It is one of the mainstream technologies for realizing wireless short-range communication.

The development of modern wireless communication technology requires that communication systems can simultaneously support two or more wireless communication protocols, such as: bluetooth (Bluetooth 2.4-2.484 GHz), WLAN, UWB, and the like. In order to implement multiband communication, a conventional method is to install multiple antennas in a communication system, where each antenna is responsible for one or several communication bands. The disadvantage of this method is that multiple antennas occupy more space, which also increases the complexity of the system and the hardware cost. Therefore, if a single antenna is used for integrating a plurality of frequency bands, the cost of hardware equipment is saved, and the complexity of system design is reduced.

The MIMO technology adopts the diversity technology, and a plurality of antennas are arranged at the transmitting end and the receiving end, so that multipath fading becomes a favorable factor, the Shannon capacity bottleneck is successfully broken through, and the channel capacity is doubled. Therefore, the research on the MIMO antenna suitable for Bluetooth and ultra-wideband communication has both theoretical significance and practical engineering value.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the above-mentioned problem that prior art exists, a two port MIMO antennas suitable for bluetooth and ultra wide band communication is provided.

In order to solve the above problem, the utility model adopts the following technical scheme:

the utility model provides a two port MIMO antennas suitable for bluetooth and ultra wide band communication, including the dielectric substrate, still including setting up the antenna element in the dielectric substrate front, the antenna element includes radiating element and microstrip line, radiating element and microstrip line connection, the center of radiating element is crossed to the extension line of microstrip line, microstrip line perpendicular to dielectric substrate front base, the bottom of microstrip line extends to dielectric substrate front base and is regarded as the connection port, the dielectric substrate back is provided with rectangular metal floor, the base of metal floor aligns and length unanimity with dielectric substrate back base, the topside etching of metal floor has the type of falling T groove, the type of falling T groove corresponds with the microstrip line position.

The radiating element as described above is circular.

The antenna unit and the inverted T-shaped groove are both two.

The two antenna units are symmetrically distributed by taking a symmetrical line of the front surface of the dielectric substrate as a symmetrical axis, the symmetrical line of the front surface of the dielectric substrate is perpendicular to the bottom edge of the front surface of the dielectric substrate, the two inverted T-shaped grooves are symmetrically distributed by taking a symmetrical line of the back surface of the dielectric substrate as a symmetrical axis, and the symmetrical line of the back surface of the dielectric substrate is perpendicular to the bottom edge of the back surface of the dielectric substrate.

The back of the dielectric substrate is also provided with a long rectangular decoupling branch knot, the bottom end of the long rectangular decoupling branch knot is connected with the metal floor, and the symmetry axis of the long rectangular decoupling branch knot is collinear with the symmetry line of the back of the dielectric substrate.

Compared with the prior art, the utility model, following beneficial effect has:

1. the size of the antenna is 30.5 multiplied by 36 multiplied by 0.8mm ³ Small size and easy production.

2. The rectangular rectangle minor matters of decoupling not only has improved antenna unit's isolation, reduces minimum operating frequency range to 2.4GHz moreover for the antenna can work in bluetooth and UWB frequency channel.

Drawings

Fig. 1 is a perspective schematic view of the present invention;

fig. 2 is a front dimension marking schematic view of the present invention;

fig. 3 is a schematic diagram of the back side dimensioning of the present invention;

fig. 4 is a simulation graph of the return loss S11 of the antenna;

fig. 5 is a graph showing a simulation of the coupling degree between two connection ports of the antenna according to the embodiment.

In the figure: 1-a dielectric substrate; 2-a radiating element; 3-a metal floor; 4-a microstrip line; 5-inverting the T-shaped groove; 6-elongated rectangular decoupling branches.

Detailed Description

To facilitate understanding and practice of the invention by those of ordinary skill in the art, the following detailed description of the invention is provided in connection with the examples, and it is to be understood that the examples described herein are for purposes of illustration and explanation only and are not intended to limit the invention.

Example 1:

the utility model provides a two port MIMO antennas suitable for bluetooth and ultra wide band communication, includes dielectric substrate 1, and dielectric substrate 1's length L is wide W and is 30.5mm 36mm, and the material that adopts is the FR4 material, and its dielectric constant is 4.4, and loss tangent is 0.02, and thickness is 0.8mm. The antenna comprises a dielectric substrate 1 and is characterized by further comprising an antenna unit arranged on the front surface of the dielectric substrate 1, the antenna unit comprises a radiation unit 2 and a microstrip line 4, the radiation unit 2 is connected with the microstrip line 4, the radiation unit 2 is fed by the microstrip line 4, an extension line of the microstrip line 4 passes through the center of the radiation unit 2, the microstrip line 4 is perpendicular to the bottom edge of the front surface of the dielectric substrate 1, the bottom end of the microstrip line 4 extends to the bottom edge of the front surface of the dielectric substrate 1 to serve as a connection port, a rectangular metal floor 3 is arranged on the back surface of the dielectric substrate 1, the bottom edge of the metal floor 3 is aligned with the bottom edge of the back surface of the dielectric substrate 1 and is consistent in length, the metal floor 3 is in horizontal rectangular shape and is distributed on the back surface of the dielectric substrate 1, the bottom edge of the metal floor 3 is aligned with the bottom edge of the back surface of the dielectric substrate 1 and is consistent in length, the length of the metal floor 3 is W, and the width of Lg.

In order to improve impedance matching, an inverted T-shaped groove 5 is etched on the top edge of the metal floor 3, the inverted T-shaped groove 5 corresponds to the microstrip line 4 in position, and the projection of the central line of the microstrip line 4 on the back surface of the dielectric substrate 1 is collinear with the central line of the inverted T-shaped groove 5. The transverse groove length of the inverted T-shaped groove 5 is L5, the transverse groove width is w3, the vertical groove length is L2, the vertical groove width is w4, and the bottom end of the vertical groove is connected with the center of the transverse groove.

The radiation unit 2 is circular, the radius of the radiation unit 2 is R, the microstrip line 4 is long strip-shaped, the length of the microstrip line 4 is Lf, the width of the microstrip line 4 is Wf, the top end of the microstrip line 4 is integrally connected with the radiation unit 2, the extension line of the microstrip line 4 passes through the circle center of the radiation unit 2, the microstrip line 4 is perpendicular to the bottom edge of the front face of the dielectric substrate 1, the bottom edge of the front face of the dielectric substrate 1 is a long edge, and the bottom end of the microstrip line 4 extends to the bottom edge of the front face of the dielectric substrate 1 to serve as a connection port. In fig. 1, port1 and Port2 respectively represent connection ports of microstrip lines 4 of two antenna units, and coaxial lines are respectively connected with the two connection ports to realize feeding of the corresponding microstrip lines 4.

The number of the antenna units and the number of the inverted-T-shaped grooves 5 are two, the two antenna units are the same in shape, the two antenna units are symmetrically distributed by taking a front symmetrical line of the dielectric substrate 1 as a symmetrical axis, the front symmetrical line of the dielectric substrate 1 is perpendicular to the bottom edge of the front of the dielectric substrate 1, the two inverted-T-shaped grooves 5 are symmetrically distributed by taking a back symmetrical line of the dielectric substrate 1 as a symmetrical axis, and the back symmetrical line of the dielectric substrate 1 is perpendicular to the bottom edge of the back of the dielectric substrate 1. The minimum distance between the two radiating elements 2 is d1.

In order to reduce the coupling between the two radiation units 2, the back surface of the dielectric substrate 1 is provided with a long rectangular decoupling branch knot 6 corresponding to the position between the two radiation units 2, the bottom end of the long rectangular decoupling branch knot 6 is connected with the metal floor 3, and the symmetry axis of the long rectangular decoupling branch knot 6 is collinear with the symmetry line of the back surface of the dielectric substrate 1. The length of the strip-shaped rectangular decoupling branch 6 is L-Lg, and the width is w1.

Radiating element 2, microstrip line 4 and metal floor 3 are the metal material, the utility model relates to a metal all indicates electrically conductive metal such as copper or gold.

In this example, L =30.5mm; w =36mm; r =5.5mm; d1=12mm; lf =5.6mm; wf =1.2mm; w1=6.5mm; l2=1.8mm; w3=0.5mm; w4=1.6mm; l5=3mm; lg =4.7mm.

Fig. 4 is a graph showing a simulation of return loss S11 of the antenna according to the embodiment. It can be known from fig. 4 that the antenna works in the frequency bands of 2.35-2.8GHz and 3.6-11GHz, and can be applied to bluetooth and ultra-wideband communication.

Fig. 5 is a simulation graph of the coupling degree S21 between the connection ports of the two antenna units according to the embodiment. As can be seen from the figure, in the working frequency band of the antenna, the coupling degrees of the two connecting ports are both smaller than-15 dB, and the standard of MIMO (multiple input multiple output) is reached to-15 dB.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A two-port MIMO antenna suitable for Bluetooth and ultra-wideband communication comprises a dielectric substrate (1) and is characterized by further comprising an antenna unit arranged on the front surface of the dielectric substrate (1),

the antenna unit comprises a radiation unit (2) and a microstrip line (4), the radiation unit (2) is connected with the microstrip line (4), an extension line of the microstrip line (4) passes through the center of the radiation unit (2), the microstrip line (4) is vertical to the bottom edge of the front face of the dielectric substrate (1), the bottom end of the microstrip line (4) extends to the bottom edge of the front face of the dielectric substrate (1) to be used as a connection port,

the back of the medium substrate (1) is provided with a rectangular metal floor (3), the bottom edge of the metal floor (3) is aligned with the bottom edge of the back of the medium substrate (1) and is consistent in length, an inverted T-shaped groove (5) is etched in the top edge of the metal floor (3), and the inverted T-shaped groove (5) corresponds to the microstrip line (4) in position.

2. A two-port MIMO antenna adapted for bluetooth and ultra-wideband communication according to claim 1, characterized in that the radiating element (2) is circular.

3. A two-port MIMO antenna adapted for bluetooth and ultra-wideband communication according to claim 1, characterised in that both the antenna unit and the inverted-T slot (5) are two.

4. The two-port MIMO antenna suitable for Bluetooth and ultra-wideband communication according to claim 3, wherein the two antenna elements are symmetrically distributed with a symmetry line of a front surface of the dielectric substrate (1) as a symmetry axis, the symmetry line of the front surface of the dielectric substrate (1) is perpendicular to a bottom edge of the front surface of the dielectric substrate (1), the two inverted T-shaped grooves (5) are symmetrically distributed with a symmetry line of a back surface of the dielectric substrate (1) as a symmetry axis, and the symmetry line of the back surface of the dielectric substrate (1) is perpendicular to a bottom edge of the back surface of the dielectric substrate (1).

5. The two-port MIMO antenna suitable for Bluetooth and ultra-wideband communication according to claim 4, wherein the back of the dielectric substrate (1) is further provided with an elongated rectangular decoupling stub (6), the bottom end of the elongated rectangular decoupling stub (6) is connected with the metal floor (3), and the symmetry axis of the elongated rectangular decoupling stub (6) is collinear with the symmetry line of the back of the dielectric substrate (1).