CN204333251U - Upside-down U-shaped microstrip antenna - Google Patents

Abstract

The utility model discloses a kind of upper reverse U shape microstrip antenna.It comprises substrate, reverse U shape paster, circular patch, the first breach radiation patch, the second breach radiation patch, square impedance matching input transmission line, rectangular metal ground plate, upper surface of base plate is provided with reverse U shape paster, circular patch, first breach radiation patch, second breach radiation patch, square impedance matching input transmission line, the U-shaped mouth being positioned at reverse U shape paster of circular patch is inner, the lower-left end of reverse U shape paster is connected with the left upper end of the first breach radiation patch, the bottom righthand side of reverse U shape paster is connected with the upper right side of the second breach radiation patch, the bottom of square impedance matching input transmission line is all connected with the bottom of substrate, base lower surface is provided with rectangular metal ground plate, the bottom of rectangular metal ground plate is connected with the bottom of substrate.The utility model has that loss is low, radiation characteristic good, structure is simple, size is little, is easy to make, be convenient to the advantages such as integrated.

Description

Upside-down U-shaped microstrip antenna

technical field

The utility model relates to an antenna, in particular to an upside-down U-shaped microstrip antenna.

Background technique

With the application and development of wireless communication technology, especially the development of mobile communication and high-speed digital wireless communication, spectrum has become a very important and scarce resource. From the centimeter wave band to the millimeter wave band, many frequency bands have been developed and used in various TV systems, wireless communication and surveillance systems, such as UHF/VHF TV systems, mobile phone systems, Global Satellite Positioning System (GPS), Bluetooth, Wireless Local Area Network (WLAN) , ultra-wideband (UWB) and automatic radar, etc. Microstrip antennas have many advantages such as: they are lightweight, inexpensive to manufacture, take up little space and are easy to conform to the communication system according to the application. At present, with various advantages, microstrip antennas are gradually replacing traditional antennas, and are gradually being used in various fields of national production and life such as national defense and economy.

In order to meet various communication requirements, wireless communication systems sometimes require a single antenna to work in a very narrow frequency band, which can greatly reduce the interference between signals. Therefore, it is necessary to develop a miniaturized single-band microstrip antenna suitable for various applications to meet the needs of modern communication systems.

Contents of the invention

The utility model provides an upside-down U-shaped microstrip antenna, and the technical scheme is as follows:

The upper inverted U-shaped microstrip antenna includes a substrate, an inverted U-shaped patch, a circular patch, a first notch radiation patch, a second notch radiation patch, a square impedance matching input transmission line, and a rectangular metal ground plate; the upper surface of the substrate There are an inverted U-shaped patch, a circular patch, a first notch radiation patch, a second notch radiation patch, a square impedance matching input transmission line, and the circular patch is located inside the U-shaped mouth of the inverted U-shaped patch. The lower left end of the inverted U-shaped patch is connected to the upper left end of the first notch radiation patch, the lower right end of the inverted U-shaped patch is connected to the upper right end of the second notch radiation patch, and the left end of the square impedance matching input transmission line is connected to the first The lower right end of the notched radiation patch is connected, the right end of the square impedance matching input transmission line is connected with the lower left end of the second notched radiation patch, the first notched radiation patch, the second notched radiation patch, and the bottom end of the square impedance matching input transmission line Both are connected to the bottom of the substrate, the lower surface of the substrate is provided with a rectangular metal grounding plate, and the bottom of the rectangular metal grounding plate is connected to the bottom of the substrate.

The substrate is made of glass fiber epoxy resin material, the length of the substrate is 37mm-39mm, and the width is 25mm-27mm. The inverted U-shaped patch is composed of a horizontal rectangular patch and two vertical rectangular patches, wherein the length of the horizontal rectangular patch is 25 mm to 27 mm, the width is 1 mm to 3 mm, and the length of the two vertical rectangular patches is equal to 18mm to 20mm, and the width is 1mm to 3mm. The radius of the circular patch is 3mm-5mm. The first notched radiation patch is formed by opening a rectangular groove in the upper right corner of a rectangular radiation patch, wherein the length of the rectangular radiation patch is 16mm-18mm, the width is 10mm-12mm, and the length of the rectangular groove is 3mm-5mm , with a width of 1 mm to 3 mm; the second notched radiation patch is formed by opening a rectangular groove in the upper left corner of a rectangular radiation patch, wherein the length of the rectangular radiation patch is 16 mm to 18 mm, and the width is 10 mm to 12 mm. The groove has a length of 3 mm to 5 mm and a width of 1 mm to 3 mm. The side length of the square impedance matching input transmission line is 3 mm to 5 mm. The length of the rectangular metal grounding plate is 25mm-27mm, and the width is 16mm-18mm.

The utility model has the advantages of low loss, good radiation characteristics, simple structure, small size, easy manufacture, convenient integration and the like.

Description of drawings:

Figure 1 is a front view of an upside-down U-shaped microstrip antenna;

Fig. 2 is the back structure diagram of the upside-down U-shaped microstrip antenna;

Fig. 3 is the return loss diagram of upside-down U-shaped microstrip antenna;

Figure 4 is the radiation pattern of the E-plane and H-plane of the upside-down U-shaped microstrip antenna at 6.28GHz;

Figure 5 is a diagram of the current density distribution on the front surface of the upside-down U-shaped microstrip antenna at 6.28 GHz;

Fig. 6 is a diagram of the current density distribution on the back surface of the upside-down U-shaped microstrip antenna at 6.28 GHz.

Detailed ways

As shown in Figures 1 and 2, the upside-down U-shaped microstrip antenna includes a substrate 1, an inverted U-shaped patch 2, a circular patch 3, a first notch radiation patch 4, a second notch radiation patch 5, a square impedance Matching input transmission line 6, rectangular metal grounding plate 7; the upper surface of the substrate 1 is provided with an inverted U-shaped patch 2, a circular patch 3, a first notch radiation patch 4, a second notch radiation patch 5, and a square impedance matching Input the transmission line 6, the circular patch 3 is located inside the U-shaped mouth of the inverted U-shaped patch 2, the lower left end of the inverted U-shaped patch 2 is connected with the upper left end of the first notch radiation patch 4, and the inverted U-shaped patch The lower right end of 2 is connected to the upper right end of the second notch radiation patch 5, the left end of the square impedance matching input transmission line 6 is connected to the lower right end of the first notch radiation patch 4, and the right end of the square impedance matching input transmission line 6 is connected to the second notch The lower left end of the radiation patch 5 is connected, the bottom ends of the first notch radiation patch 4, the second notch radiation patch 5, and the square impedance matching input transmission line 6 are all connected to the bottom end of the substrate 1, and the bottom surface of the substrate 1 is set There is a rectangular metal grounding plate 7 , and the bottom end of the rectangular metal grounding plate 7 is connected to the bottom end of the substrate 1 .

The substrate 1 is made of glass fiber epoxy resin material, the length of the substrate 1 is 37mm-39mm, and the width is 25mm-27mm. The inverted U-shaped patch 2 is composed of a horizontal rectangular patch and two vertical rectangular patches, wherein the length of the horizontal rectangular patch is 25 mm to 27 mm, the width is 1 mm to 3 mm, and the length of the two vertical rectangular patches is Both are 18mm to 20mm, and the width is 1mm to 3mm. The radius of the circular patch 3 is 3mm-5mm. The first notched radiation patch 4 is formed by opening a rectangular groove in the upper right corner of a rectangular radiation patch, wherein the length of the rectangular radiation patch is 16mm-18mm, the width is 10mm-12mm, and the length of the rectangular groove is 3mm-12mm. 5mm, with a width of 1mm to 3mm; the second notched radiation patch 5 is formed by opening a rectangular groove in the upper left corner of a rectangular radiation patch, wherein the length of the rectangular radiation patch is 16mm to 18mm, and the width is 10mm to 12mm , the length of the rectangular groove is 3 mm to 5 mm, and the width is 1 mm to 3 mm. The side length of the square impedance matching input transmission line 6 is 3mm-5mm. The length of the rectangular metal grounding plate 7 is 25mm-27mm, and the width is 16mm-18mm.

Example 1

Upside-down U-shaped microstrip antenna:

A glass fiber epoxy resin material with a dielectric constant of 4.4 is selected to make a microstrip substrate with a thickness of 1.6mm. The substrate has a length of 38mm and a width of 26mm. The inverted U-shaped patch consists of a horizontal rectangular patch and two vertical rectangular patches. The length of the horizontal rectangular patch is 26mm and the width is 2mm. The length of the two vertical rectangular patches is 19mm and the width is 2mm. . The radius of the circular patch is 4mm. The first notch radiation patch is formed by opening a rectangular groove in the upper right corner of a rectangular radiation patch, the length of the rectangular radiation patch is 17mm, the width is 11mm, the length of the rectangular groove is 4mm, and the width is 2mm; the second notch radiation The patch is formed by opening a rectangular slot in the upper left corner of a rectangular radiation patch. The length of the rectangular radiation patch is 17mm, and the width is 11mm. The length of the rectangular slot is 4mm, and the width is 2mm. The square impedance-matched input transmission line has a side length of 4mm. The rectangular metal ground plate has a length of 26mm and a width of 17mm. The various performance indicators of the upside-down U-shaped microstrip antenna are tested with CST software, and the return loss curve obtained is shown in Figure 3. It can be seen from the figure that the working frequency band below -10dB is 6.01GHz to 6.50GHz. Figure 4 shows the E-plane and H-plane patterns of the upside-down U-shaped microstrip antenna at 6.28GHz. It can be seen from the figure that when the frequency is 6.28GHz, the gain is 4.0dBi, and the half-power lobe width is 110.1°. Figures 5 to 6 are the current density distribution diagrams on the front and back surfaces of the upside-down U-shaped microstrip antenna at 6.28 GHz, respectively.

Claims (7)

1. an inverted U-shaped microstrip antenna is characterized in that it comprises a substrate (1), an inverted U-shaped patch (2), a circular patch (3), a first notch radiation patch (4), a second Notched radiation patch (5), square impedance matching input transmission line (6), rectangular metal grounding plate (7); the upper surface of the substrate (1) is provided with an inverted U-shaped patch (2), a circular patch (3) , the first notch radiation patch (4), the second notch radiation patch (5), the square impedance matching input transmission line (6), the U-shaped patch (3) located in the inverted U-shaped patch (2) Inside the mouth, the lower left end of the inverted U-shaped patch (2) is connected to the upper left end of the first notch radiation patch (4), and the lower right end of the inverted U-shaped patch (2) is connected to the second notch radiation patch (5) The upper right end of the square impedance matching input transmission line (6) is connected to the lower right end of the first notch radiation patch (4), and the right end of the square impedance matching input transmission line (6) is connected to the second notch radiation patch (5) The bottom left end of the first notch radiation patch (4), the second notch radiation patch (5), and the bottom end of the square impedance matching input transmission line (6) are all connected to the bottom end of the substrate (1), and the substrate ( The lower surface of 1) is provided with a rectangular metal grounding plate (7), and the bottom end of the rectangular metal grounding plate (7) is connected to the bottom end of the substrate (1). 2. A kind of upside-down U-shaped microstrip antenna as claimed in claim 1, characterized in that said substrate (1) is a glass fiber epoxy resin material, the length of the substrate (1) is 37mm～39mm, and the width is 25mm ~ 27mm. 3. A kind of upside-down U-shaped microstrip antenna as claimed in claim 1, characterized in that said upside-down U-shaped patch (2) consists of a horizontal rectangular patch and two vertical rectangular patches, wherein the horizontal The length of the rectangular patch is 25mm-27mm, and the width is 1mm-3mm. The length of the two longitudinal rectangular patches is 18mm-20mm, and the width is 1mm-3mm. 4. An upside-down U-shaped microstrip antenna as claimed in claim 1, characterized in that the radius of the circular patch (3) is 3 mm to 5 mm. 5. A kind of upside-down U-shaped microstrip antenna as claimed in claim 1, characterized in that said first notch radiation patch (4) is formed by opening a rectangular groove in the upper right corner of a rectangular radiation patch, wherein The length of the rectangular radiation patch is 16mm-18mm, the width is 10mm-12mm, the length of the rectangular slot is 3mm-5mm, and the width is 1mm-3mm; the second notch radiation patch (5) consists of a rectangular radiation patch It is formed by opening a rectangular slot in the upper left corner of the screen. The length of the rectangular radiation patch is 16mm-18mm, and the width is 10mm-12mm. The length of the rectangular slot is 3mm-5mm, and the width is 1mm-3mm. 6. An upside-down U-shaped microstrip antenna as claimed in claim 1, characterized in that the side length of said square impedance matching input transmission line (6) is 3 mm to 5 mm. 7. An upside-down U-shaped microstrip antenna as claimed in claim 1, characterized in that the length of the rectangular metal ground plate (7) is 25mm-27mm, and the width is 16mm-18mm.