A straight linear patch array with a band-notched characteristic applied to ultra-wideband

Abstract

The application discloses a straight-line patch array with a band-stop characteristic applied to an ultra-wide band, the patch array is divided into a three-layer structure, the top layer is four combined copper patches of a fan shape and a rectangle, the middle layer is a dielectric substrate, and the bottom layer is a copper reflection plate; the three-layer structure is connected into a whole through four feeding devices; a radiation patch is printed on the dielectric substrate; high and low impedance lines are arranged on the radiation patch; and three groups of slot groups are formed in the radiation patch. The fan-shaped patch can make the antenna array have a wider bandwidth; the reflection plate is placed below the dielectric substrate and is connected with a coaxial connector, so that the antenna array can realize directional radiation and improve the gain; the patch antenna is printed on the dielectric substrate, the patch is connected with an outer conductor of the coaxial connector, and long slots on the patch can make the array antenna realize wave trapping at 3.3-3.7 GHz, thereby avoiding electromagnetic interference on part of a sub-6 5GHz frequency band.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of radio frequency antennas, and particularly relates to a linear patch array with direct connection and trap wave characteristics applied to ultra-wideband. BACKGROUND

[0002] New generation communication devices and imaging radars require wideband, low profile, close arrangement and high gain. It is very challenging to achieve these performances for traditional resonant planar antennas such as microstrip antennas or slot antennas. The design of ultra-wideband (UWB) antennas has attracted extensive attention. At present, UWB antenna arrays are also widely used in advanced radars and communications, and different kinds of planar wideband antennas have been researched and reported for UWB applications.

[0003] Traditional phased array antennas are limited by the unit spacing, which makes the array size too large and is not conducive to further expansion of the antenna bandwidth, and planarization, compact structure and wideband are the main trends of today's array antennas, so the array antenna using the coupling effect between units to expand the antenna bandwidth has become a research hotspot in the field of array antennas. SUMMARY

[0004] The purpose of the application is to provide a linear patch array with direct connection and trap wave characteristics applied to ultra-wideband, which realizes the miniaturization of the antenna size, enhances the impedance bandwidth of the antenna, and makes the antenna have higher gain by opening a group of slots symmetric about the center of the radiation patch, a group of rectangular slots symmetric about the feeding device, and a group of irregular slots symmetric about the feeding device on the radiation patch on the antenna array substrate.

[0005] Technical scheme: The application provides a linear patch array with direct connection and trap wave characteristics applied to ultra-wideband, which is divided into three layers of structure, the top layer is four fan-shaped and rectangular combined copper sheets, the middle layer is a dielectric substrate, and the bottom layer is a copper reflection plate, the three layers of structure are connected as a whole through four feeding devices, the dielectric substrate is provided with a radiation patch, the radiation patch is provided with high and low impedance lines, and the radiation patch is provided with three groups of slot groups. The fan-shaped patch can make the antenna array have a wider bandwidth; the reflection plate is placed below the dielectric substrate and connected with the coaxial, which can make the antenna array directional radiation and improve the gain; the patch antenna is printed on the dielectric substrate, the patch is connected with the outer conductor of the coaxial, and the long slot on the patch can make the array antenna realize trap wave at 3.3-3.7GHz, avoiding electromagnetic interference to part of the sub-6 5GHz frequency band.

[0006] Furthermore, the three sets of slots include a first slot group, a second slot group, and a third slot group; the first slot group includes three U-shaped slots symmetrical about the center of the radiating patch and two straight slots symmetrical about the center of the radiating patch; the second slot group includes eight rectangular slots symmetrical about the left and right sides of the power supply device; the third slot group includes four irregular slots symmetrical about the left and right sides of the power supply device. The irregular slots are opened along the outside of the high and low impedance lines, connecting to the second slot group. The four sets of irregular slots have the same structure and are linearly connected, penetrating the radiating patch.

[0007] Furthermore, the aspect ratio of the dielectric substrate is 7:2-2.5; the aspect ratio of the four rectangular patch edge units in the upper half of the radiating patch is 2:1-1.5, the aspect ratio of the middle unit is 3:2-2.5, and the aspect ratio of the rectangular patch in the lower half is 7.5:1-1.5.

[0008] Furthermore, in the first slotted group, the length-to-width ratio of the straight slot is 7:1-1.5, and the length-to-width ratio of the U-shaped slot is 18:1-1.5; the length-to-width ratio of the second slotted group is 4:3-3.5; and the length-to-width ratio of the third slotted group is 14:1-1.5 for the through-radiating patch.

[0009] Furthermore, the high and low impedance lines comprise two microstrip lines with different widths, and the aspect ratios of the high and low impedance lines are 4:1-1.5 and 1.5:1-1.5, respectively.

[0010] Furthermore, the outer skin of the power supply device is connected to the copper reflector and the radiating patch, and the power supply core of the power supply device penetrates the dielectric substrate and is connected to the fan-shaped and rectangular combined copper sheet on the top layer.

[0011] Furthermore, the materials of the radiation patch include silver, copper, gold, and aluminum.

[0012] Furthermore, the four irregular slots, which are symmetrical about the power supply device, are linearly connected.

[0013] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0014] (1) The spacing between array antenna elements is 0.35 times the lowest frequency wavelength, which is less than 0.5 times the lowest frequency wavelength of traditional array antenna elements.

[0015] (2) The array antenna has ultra-wideband characteristics and covers the UWB band, with high gain within the band.

[0016] (3) The array antenna achieves notch filtering in the 3.3–3.7 GHz range by introducing notch slots at locations with minimal current influence on the patch, thus avoiding electromagnetic interference in part of the sub-6 5 GHz frequency band. Unlike traditional notch filtering structures, this method extends the current path while achieving notch filtering, enabling miniaturization of the antenna array. Attached Figure Description

[0017] Figure 1 This is a top view of the present invention;

[0018] Figure 2 This is a side view of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the testing device used in this invention;

[0021] Figure 5 This is a simulation diagram of the S-parameters of the present invention;

[0022] Figure 6 This is a gain simulation diagram of the present invention.

[0023] In the diagram: 1. Four fan-shaped and rectangular copper sheets; 2. Dielectric substrate; 3. Copper reflector; 4. Radiation patch; 5. First slotted group; 6. Power supply device; 7. Second slotted group; 8. Third slotted group; 9. High and low impedance lines. Detailed Implementation

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0025] This invention proposes an ultra-wideband direct-connected linear array with notch filtering, such as... Figure 1 , Figure 2 As shown, the antenna array consists of three layers: the top layer comprises four fan-shaped and rectangular copper plates 1; the middle layer is a dielectric substrate 2; and the bottom layer is a copper reflector 3. The three layers are connected as a whole by four feed devices 6. A radiating patch 4 is printed on the dielectric substrate 2, and the radiating patch 4 is made of metal.

[0026] Reference Figure 1 The radiation patch 4 has three sets of slots: the first slot group 5, the second slot group 7, and the third slot group 8.

[0027] The first slot group 5 includes three U-shaped slots that are symmetrical about the center of the radiating patch 4 and two straight slots that are symmetrical about the center of the radiating patch. The first slot group is mainly used to introduce notch filters in the frequency band.

[0028] The second slot group 7 includes eight rectangular slots that are symmetrical about the power supply device 6. The second slot group is mainly used to achieve impedance matching.

[0029] The third slot group 8 includes four irregular slots that are symmetrical about the power supply device 6. The irregular slots are opened along the outside of the high and low impedance lines 9 and are connected to the second slot group 7. The four groups of irregular slots have the same structure and are linearly connected, penetrating the radiating patch 4.

[0030] Reference Figure 1 The radiating patch 4 is provided with high and low impedance lines 9, which are arranged inside the patch. The high and low impedance lines 9 are composed of two microstrip lines with different widths. The high and low impedance lines 9 help to achieve impedance matching of the antenna array.

[0031] Reference Figure 1 The top four fan-shaped and rectangular copper plates 1 are composed of fan-shaped and rectangular copper plates. The top copper plates 1 are mainly used to extend the impedance bandwidth of the antenna array.

[0032] Reference Figure 2 The array antenna also includes a feeding device 6, which is used to feed the antenna. The outer skin of the feeding device 6 is connected to the copper reflector 3 and the radiating patch 4. The feeding core of the feeding device 6 passes through the dielectric substrate 2 and is connected to the top copper sheet 1.

[0033] Reference Figure 3 The dimensions of the slot group and impedance line on the antenna's radiating patch 4 are shown in Table 1.

[0034] Table 1

[0035]

[0036]

[0037] The performance of the ultra-wideband direct-connect linear array with notch filtering provided in this embodiment of the invention is simulated: The ultra-wideband direct-connect linear array with notch filtering prepared using the above scheme is connected to a 1-to-4 broadband commercial power divider. The test setup is as follows: Figure 4 .

[0038] Reference Figure 5 The results show that the antenna achieved a bandwidth of 3 GHz to 11.5 GHz, a relative bandwidth of 117%, and implemented notch filtering in the 3.3 GHz to 3.7 GHz range, avoiding electromagnetic interference to part of the sub-6 5 GHz band. Figure 5 As shown by the curve, the measurement results agree well with the simulation results.

[0039] Reference Figure 6 The results show that the antenna gain is between 10 and 17 dBi within the frequency band, and drops sharply to -3.7 dBi within the notch band. The measurement results are in good agreement with the simulation results.

[0040] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any transformations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A direct-connect linear patch array with band notch characteristics for ultra-wideband applications, characterized in that, The patch array is divided into three layers. The top layer is a combination of four fan-shaped and rectangular copper sheets (1), the middle layer is a dielectric substrate (2), and the bottom layer is a copper reflector (3). The three layers are connected into a whole by four feeding devices (6). The dielectric substrate (2) is provided with a radiating patch (4), and the radiating patch (4) is provided with high and low impedance lines (9). The radiating patch (4) is provided with three sets of slots. The three sets of slots include a first slot group (5), a second slot group (7), and a third slot group (8). The first slot group (5) includes three U-shaped slots symmetrical about the center of the radiating patch (4) and two straight slots symmetrical about the center of the radiating patch (4). The second slot group (7) includes eight rectangular slots symmetrical about the left and right sides of the feeding device (6). The third slot group (8) runs through the radiating patch (4). The four sets of high and low impedance lines (9) are placed in the third slot group (8) and connected to the upper and lower rectangular patches in the radiating patch (4).

2. The direct-connect linear patch array with band notch characteristics applied to ultra-wideband as described in claim 1, characterized in that, The aspect ratio of the dielectric substrate (2) is 7:2-2.5; the aspect ratio of the four rectangular patch edge units in the upper half of the radiating patch (4) is 2:1-1.5, the aspect ratio of the middle unit is 3:2-2.5, and the aspect ratio of the rectangular patch in the lower half is 7.5:1-1.

5.

3. The direct-connect linear patch array with band notch characteristics applied to ultra-wideband as described in claim 1, characterized in that, In the first slotted group (5), the length-to-width ratio of the straight slot is 7:1-1.5, and the length-to-width ratio of the U-shaped slot is 18:1-1.5; the length-to-width ratio of the second slotted group (7) is 4:3-3.5; the third slotted group (8) penetrates the radiating patch (4), and the length-to-width ratio of the third slotted group (8) is 14:1-1.

5.

4. The direct-connect linear patch array with band notch characteristics applied to ultra-wideband as described in claim 1, characterized in that, The high and low impedance lines (9) include two microstrip lines with different widths, and the aspect ratios of the high and low impedance lines (9) are 4:1-1.5 and 1.5:1-1.5, respectively.

5. A direct-connect linear patch array with band notch characteristics for ultra-wideband applications according to claim 1, characterized in that, The outer skin of the power supply device (6) is connected to the copper reflector (3) and the radiation patch (4). The power supply core of the power supply device (6) passes through the dielectric substrate (2) and is connected to the fan-shaped and rectangular combined copper sheet (1) on the top layer.

6. The direct-connect linear patch array with band notch characteristics applied to ultra-wideband as described in claim 1, characterized in that, The materials of the radiation patch (4) include silver, copper, gold and aluminum.

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