CN110518336A - A kind of omnidirectional radiation car antenna - Google Patents

Abstract

The invention discloses an omnidirectional radiation vehicle-mounted antenna, belonging to the field of microwave technology, comprising a metal ground plane and a radiation patch unit, the metal ground plane is used as the base, the radiation patch unit is parallel to the metal ground plane, and one end of the radiation patch unit passes through The short-circuit metal sheet is connected to the metal ground plane, and the other end is vertically connected to the metal ground plane through the medium metal sheet and the wide strip microstrip line; slots are set in the radiation patch unit, which are U-shaped gaps, short L-shaped gaps and Long L-shaped slit. An omnidirectional radiation vehicle-mounted antenna of the present invention, the designed antenna has the advantages of light weight, low profile, low cost, good mechanical strength, wide frequency band, high efficiency, little influence from the surrounding environment, little radiation damage to the human body, and high coverage frequency. Series advantages. At the same time, the invention has the advantages of small volume, novel structure, low cost and convenient processing and production.

Description

An Omnidirectional Radiation Vehicular Antenna

technical field

The invention belongs to the field of microwave technology, and in particular relates to an omnidirectional radiation vehicle-mounted antenna.

Background technique

As people's daily means of transportation, automobiles are equipped with more comprehensive entertainment facilities to relieve fatigue during driving. The car antenna is one of the necessary components in today's cars. Considering people's requirements for car design today, the design of the car console antenna must be small, convenient, beautiful and efficient.

In actual demand, in order to be able to adapt to the multi-band work of wireless communication, it is necessary for the antenna to realize multi-band work, which requires the support of other technologies. We can achieve this by using double feed points or digging slots on the antenna radiating metal sheet to form gaps. However, when double-feed points are used, the tuning frequency and tuning range are often limited.

Contents of the invention

Purpose of the invention: The purpose of the present invention is to provide an omnidirectional radiation vehicle-mounted antenna, which has a simple and novel structure, adapts to actual needs, and has a wide operating frequency band, low cross-sectional size, and is easy to manufacture and realize.

Technical solution: In order to achieve the above object, the present invention provides the following technical solution:

An omnidirectional radiation vehicle-mounted antenna, comprising a metal ground plane and a radiation patch unit, the metal ground plane is used as a base, the radiation patch unit is parallel to the metal ground plane, and one end of the radiation patch unit passes through The short-circuit metal sheet is connected to the metal ground plane, and the other end is connected to the metal ground plane vertically through the medium metal sheet and the wide strip microstrip line in turn; slots are set in the radiation patch unit, which are U-shaped gaps and short L Gap and Long L Gap.

Further, the short-circuit metal sheet is a metal medium connecting the metal ground plane and the radiation patch unit, and the wide-strip microstrip line is a feeder.

Further, the wide strip microstrip line is connected with the medium metal sheet with the same length.

Further, the metal ground plane has a length of 80-120 mm and a width of 20-60 mm, and the patch radiation unit has a length of 35-45 mm and a width of 18-28 mm; the short-circuited metal sheet The length is 2-4 mm, the height is 14-16 mm, the length of the medium metal sheet is 22-24 mm, and the height is 13-14 mm; the length of the wide strip microstrip line is 22-24 mm, The height is 1-2 mm.

Further, the length of the metal ground plane is 100 mm, and the width is 40 mm, the length of the patch radiation unit is 40 mm, and the width is 23 mm, and the length of the short-circuit metal sheet is 3 mm, The height is 15 mm, the length of the wide strip microstrip line is 23 mm, and the height is 1.5 mm; the length of the medium metal sheet is 23 mm, and the height is 13.5 mm.

Further, the U-shaped slot includes four rectangular antenna units connected in sequence, which are the first rectangular antenna unit, the second rectangular antenna unit, the third rectangular antenna unit and the fourth rectangular antenna unit; the short The L-shaped slot includes a fifth rectangular antenna unit and a sixth rectangular antenna unit vertically connected, and the long L-shaped slot includes a seventh rectangular antenna unit and an eighth rectangular antenna unit vertically connected.

Further, the first rectangular antenna unit, the third rectangular antenna unit, the sixth rectangular antenna unit and the eighth rectangular antenna unit are parallel to each other, and the second rectangular antenna unit, the fourth rectangular antenna unit, the fifth rectangular antenna unit The antenna unit and the seventh rectangular antenna unit are parallel to each other; after matching, the second rectangular antenna unit is close to the fifth rectangular antenna unit, and the fourth rectangular antenna unit is close to the seventh rectangular antenna unit.

Further, the length of the first rectangular antenna unit is 4 mm, the length of the second rectangular antenna unit is 15 mm, the length of the third rectangular antenna unit is 35 mm, the length of the fourth rectangular antenna unit is 17 mm, and the U-shaped slot The length of the first slot is 1 mm; the length of the fifth rectangular antenna element is 14 mm, the length of the sixth rectangular antenna element is 5 mm, the length of the second slot of the short L-shaped slot is 1 mm; the length of the seventh rectangular antenna element is 14 mm , the length of the eighth rectangular antenna element is 9 mm, and the length of the third slot of the long L-shaped slot is 1 mm.

Invention principle: From a technical point of view, this antenna is evolved from a monopole antenna. In the actual design of this antenna, slotting is often used to achieve multi-frequency work. The slot is on the radiation patch unit and consists of three different slits. The ground plane acts somewhat as a reflective metal plate, connected to the radiating patch by a shorting metal plate. The way of feeding is wide strip microstrip line feeding. The purpose of changing the resonant frequency can be achieved by changing the length of the radiating patch, and the purpose of increasing the antenna bandwidth can be achieved by changing the height of the radiating metal sheet, making full use of the environmental conditions of the car console. The slotted design of the radiation patch enables the antenna to achieve multi-frequency operation. In order to combine with the actual situation of the height of the car console, this feature is flexibly designed and used. This antenna can further expand the bandwidth, improve the transmission efficiency, and realize multi-frequency operation.

Beneficial effects: Compared with the prior art, the omnidirectional radiation vehicle-mounted antenna of the present invention has the advantages of light weight, low profile, low cost, good mechanical strength, wide frequency band, high efficiency, little influence by the surrounding environment, It has a series of advantages such as small radiation damage to the human body and high coverage frequency. At the same time, the invention has the advantages of small volume, novel structure, low cost and convenient processing and production.

Description of drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of a vehicle-mounted antenna;

Fig. 2 is a top view structural schematic diagram of a vehicle-mounted antenna;

Figure 3 is the antenna return loss characteristic curve calculated by the vehicle antenna using HFSS software;

Figure 4 is the radiation pattern of the vehicle antenna at 1.7GHz;

Figure 5 is the radiation pattern of the vehicle antenna at 2.0GHz;

Figure 6 is the radiation pattern of the vehicle antenna at 3.4GHz;

Reference signs: 1-metal ground plane, 2-radiation patch unit, 3-short-circuit metal sheet, 4-wide strip microstrip line, 5-medium metal sheet, 6-U-shaped long slot, 7-short L-shaped Slot, 8-long L-shaped slot, L1-first rectangular antenna unit, W1-second rectangular antenna unit, L2-third rectangular antenna unit, W2-fourth rectangular antenna unit, W3-fifth rectangular antenna unit, L3 - the sixth rectangular antenna unit, W4 - the seventh rectangular antenna unit, L4 - the eighth rectangular antenna unit, the first slot length T1, the second slot length T2, and the third slot length T3.

Detailed ways

In order to better understand the content of the patent of the present invention, the technical solution of the present invention will be further described below in conjunction with the drawings and specific embodiments.

As shown in Figure 1-2, an omnidirectional radiation vehicle-mounted antenna is suitable for the vehicle console, including a metal ground plane 1, a radiation patch unit 2, a short-circuit metal sheet 3 and a wide-strip microstrip line 4. With the metal ground plane 1 as the base, a radiation patch unit 2 is placed at a height of H, and the radiation patch unit 2 is parallel to the metal ground plane 1 . The two are supported by a short-circuit metal sheet 3, the short-circuit metal sheet 3 is the metal medium connecting the ground plane 1 and the radiation patch unit 2, the wide strip microstrip line 4 is the feeding place, and the antenna passes through the wide strip microstrip line 4 Feed, and the lower end of the wide strip feeding microstrip line 4 is connected to the ground plane 1 , the upper end is connected to a medium metal sheet 5 , and the upper end of the medium metal sheet 5 is connected to the radiation patch unit 2 . The radiation patch unit 2 is slotted and has a U-shaped slit 6 , a short L-shaped slit 7 and a long L-shaped slit 8 . One end of the radiation patch unit 2 is vertically connected to the metal ground plane 1 through a short-circuit metal sheet 3 . The other end of the radiation patch unit 2 is vertically connected to the metal ground plane 1 through the medium metal sheet 5 and the wide strip microstrip line 4 in turn.

The wide-strip microstrip line 4 is connected to the medium metal sheet 5 of the same length, and the whole is used as a connection between the supporting ground plane and the radiation patch unit, that is, the upper end of the medium metal sheet 5 is connected to the radiation patch unit 2, and the lower end is connected to the wide strip microstrip line. Strip line 4.

The antenna is fed by a wide strip microstrip line 4, and the resonant frequency of the antenna is adjusted by adjusting the side length of the radiation patch unit 2 on the top layer.

As shown in Figure 1, the length of the metal ground plane 1 is in the range of 80-120 mm, and the width is in the range of 20-60 mm, and the length of the patch radiation unit 2 is in the range of 35-45 mm, and the width is in the range of 18-28 mm Within the range, connect the radiation patch unit 2 through the short-circuit metal sheet 3, the length of the short-circuit metal sheet 3 is within the range of 2-4 mm, the height is within the range of 14-16 mm, and the length of the medium metal sheet 5 is within the range of 22-24 mm , the height is in the range of 13-14 mm, the length of the wide strip microstrip line 4 is in the range of 22-24 mm, and the height is in the range of 1-2 mm, there is a slotted part on the patch radiation unit 2, which can realize the antenna Multi-frequency work.

As shown in Figure 2, the slotted part of the patch radiation unit 2, the U-shaped slot 6 includes four rectangular antenna units connected in sequence, namely the first rectangular antenna unit L1, the second rectangular antenna unit W1, the third rectangular antenna unit Antenna element L2 and a fourth rectangular antenna element W2. The length of the first rectangular antenna unit L1 is 4 mm, the length of the second rectangular antenna unit W1 is 15 mm, the length of the third rectangular antenna unit L2 is 35 mm, the length of the fourth rectangular antenna unit W2 is 17 mm, and the U-shaped slot 6 A slot length T1 is 1 mm; the first rectangular antenna unit L1 is parallel to the third rectangular antenna unit L2, and the second rectangular antenna unit W1 is parallel to the fourth rectangular antenna unit W2.

The short L-shaped slot 7 includes two consecutively connected rectangular antenna units, namely the fifth rectangular antenna unit W3 and the sixth rectangular antenna unit L3 . Wherein, the fifth rectangular antenna unit W3 and the sixth rectangular antenna unit L3 are perpendicular to each other; the fifth rectangular antenna unit W3 has a length of 14 millimeters, the sixth rectangular antenna unit L3 has a length of 5 millimeters, and the second slit length of the short L-shaped slot 7 T2 is 1 mm.

The long L-shaped slot 8 includes two consecutively connected rectangular antenna units, namely the seventh rectangular antenna unit W4 and the eighth rectangular antenna unit L4 . Wherein, the seventh rectangular antenna unit W4 and the eighth rectangular antenna unit L4 are perpendicular to each other; the length of the seventh rectangular antenna unit W4 is 14 millimeters, the length of the eighth rectangular antenna unit L4 is 9 millimeters, and the length of the third slit of the long L-shaped slot 8 is T3 is 1mm.

Example

As shown in FIG. 1 , the metal ground plane 1 has a length of 100 mm and a width of 40 mm. The patch radiation unit 2 has a length of 40 mm and a width of 23 mm, and the short-circuit metal sheet 3 has a length of 15 mm and a height of 3 mm. The wide strip microstrip line 4 has a length of 23 mm and a height of 1.5 mm. The length of medium sheet metal 5 is 23 millimeters, and height is 13.5 millimeters.

As shown in Figure 3, the simulation experiment of this vehicle antenna is carried out with the electromagnetic simulation software HFSS. Experimental reflection coefficient S11 characteristics, S11<-10dB between 0.92-0.98GHz, 2.60-3.26GHz and 3.35-3.70GHz, relative bandwidths are 6.3%, 22.5% and 9.9%, and at 0.95GHz, 2.83GHz and 3.56 Three resonance points are generated at GHz to realize broadband characteristics.

As shown in Figure 4-6, the electromagnetic simulation software HFSS is used to simulate the vehicle antenna. The antenna radiation patterns at three frequency points of 1.3GHz, 2.0GHz and 2.7GHz are given respectively. It can be seen that the antenna has good radiation performance at different frequencies, and has strong radiation capability in all directions, that is, the antenna has good omnidirectional radiation characteristics.

Claims (8)

1. a kind of omnidirectional radiation car antenna, it is characterised in that: including metal ground plane (1) and radiation patch unit (2), with The metal ground plane (1) is substrate, and the radiation patch unit (2) is parallel to metal ground plane (1), described Radiation patch unit (2) one end is connected by short-circuiting jumper (3) with metal ground plane (1), and the other end passes sequentially through medium Sheet metal (5) is vertical with wide band microstrip line (4) to be connected with metal ground plane (1)；On the radiation patch unit (2) Fluting, respectively U-shaped gap (6), short L-type gap (7) and long L-type gap (8).

2. a kind of omnidirectional radiation car antenna according to claim 1, it is characterised in that: the short-circuiting jumper (3) For connection metal ground plane (1) and radiation patch unit (2) metal medium, the wide band microstrip line (4) is at feed.

3. a kind of omnidirectional radiation car antenna according to claim 1, it is characterised in that: the wide band microstrip line (4) it is connected with same length medium sheet metal (5).

4. a kind of omnidirectional radiation car antenna according to claim 1, it is characterised in that: the metal ground plane (1) length is 80-120 millimeters, and width is 20-60 millimeters, and the length of patch radiating element (2) is 35-45 millimeters, and width is 18-28 millimeters；The length of the short-circuiting jumper (3) is 2-4 millimeters, is highly 14-16 millimeters, the medium sheet metal (5) length is 22-24 millimeters, is highly 13-14 millimeters；Wide band microstrip line (4) length is 22-24 millimeters, height It is 1-2 millimeters.

5. a kind of omnidirectional radiation car antenna according to claim 4, it is characterised in that: the metal ground plane (1) length is 100 millimeters, and width is 40 millimeters, and the length of the patch radiating element (2) is 40 millimeters, width 23 The length of millimeter, the short-circuiting jumper (3) is 3 millimeters, is highly 15 millimeters, the length of the wide band microstrip line (4) Degree is 23 millimeters, is highly 1.5 millimeters；Medium sheet metal (5) length is 23 millimeters, is highly 13.5 millimeters.

6. a kind of omnidirectional radiation car antenna according to claim 1, it is characterised in that: the U-shaped gap (6) includes Four sections of squaerial units being sequentially connected, respectively the first squaerial unit (L1), the second squaerial unit (W1), Three squaerial units (L2) and the 4th squaerial unit (W2)；The short L-type gap (7) includes the connected vertically 5th Squaerial unit (W3) and the 6th squaerial unit (L3), the long L-type gap (8) includes the 7th square connected vertically Shape antenna element (W4) and the 8th squaerial unit (L4).

7. a kind of omnidirectional radiation car antenna according to claim 6, it is characterised in that: the first squaerial list First (L1), third squaerial unit (L2), the 6th squaerial unit (L3) and the 8th squaerial unit (L4) are mutually flat Row, the second squaerial unit (W1), the 4th squaerial unit (W2), the 5th squaerial unit (W3) and the 7th Squaerial unit (W4) is parallel to each other；After cooperation, the second squaerial unit (W1) and the 5th squaerial unit (W3) close, the 4th squaerial unit (W2) and the 7th squaerial unit (W4) are close.

8. a kind of omnidirectional radiation car antenna according to claim 6, it is characterised in that: the first squaerial list First (L1) length is 4 millimeters, and the second squaerial unit (W1) length is 15 millimeters, and third squaerial unit (L2) length is 35 millimeters, the 4th squaerial unit (W2) length is 17 millimeters, and it is 1 millimeter that the first of U-shaped gap (6), which stitches long (T1),；5th Squaerial unit (W3) length is 14 millimeters, and the 6th squaerial unit (L3) length is 5 millimeters, the of short L-type gap (7) Two seams long (T2) are 1 millimeter；7th squaerial unit (W4) length is 14 millimeters, and the 8th squaerial unit (L4) length is 9 millimeters, it is 1 millimeter that the third of long L-type gap (8), which stitches long (T3),.