Millimeter wave broadband planar antenna with notch characteristic

Abstract

The utility model discloses a millimeter wave broadband planar antenna with a notch characteristic. The millimeter wave broadband planar antenna comprises a dielectric layer; the radiation layer is located on the first surface of the dielectric layer, the radiation layer is provided with a radiation body, a feeder line and a microstrip line, and the radiation body is provided with a cross-shaped gap; the radio frequency ground layer is located on the second surface of the dielectric layer, and the radio frequency ground layer is provided with a metal patch; the antenna is a millimeter wave broadband planar antenna, has the advantage of in-band notch, and can effectively suppress in-band interference.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of antennas, in particular to a millimeter wave broadband planar antenna with a notch characteristic. BACKGROUND

[0002] The millimeter wave broadband planar antenna has the advantages of high transmission rate, low cost, light weight, simple design, high data transmission rate and easy integration with other components, and has attracted extensive attention and in-depth research of scholars and engineers in the industry. However, the millimeter wave broadband planar antennas reported at present often do not have a notch in the band, and cannot effectively suppress the in-band interference, which limits their use in modern wireless communication terminals. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the application is to provide a millimeter wave broadband planar antenna with a notch characteristic, which aims to solve the problem that the existing millimeter wave broadband planar antenna often does not have a notch in the band and cannot effectively suppress the in-band interference.

[0004] To achieve the above purpose, the millimeter wave broadband planar antenna with a notch characteristic provided by the application comprises a dielectric layer;

[0005] A radiation layer is located on the first surface of the dielectric layer, and the radiation layer is provided with a radiation body, a feed line and a microstrip line, and a cross-shaped slot is formed in the radiation body.

[0006] A radio frequency ground layer is located on the second surface of the dielectric layer, and the radio frequency ground layer is provided with a metal patch.

[0007] Optionally, the feed line is arranged on one side of the radiation body, the feed line is arranged vertically to the first edge of the radiation body, one end of the feed line is connected to the first edge of the radiation body, and the other end of the feed line is aligned with one edge of the dielectric layer.

[0008] Optionally, the microstrip line is provided with two, and the two microstrip lines are symmetrically distributed on both sides of the feed line, the microstrip line comprises a first transverse portion, a second transverse portion and a vertical portion, the first transverse portion and the second transverse portion are arranged in parallel to the feed line, the vertical portion is arranged vertically to the feed line, one end of the vertical portion is connected to one end of the first transverse portion, the other end of the vertical portion is connected to one end of the second transverse portion, the length of the first transverse portion is greater than the length of the second transverse portion, and the distance between the first transverse portion and the feed line is smaller than the distance between the second transverse portion and the feed line.

[0009] Optionally, the length of the first transverse portion is L1, the length of the vertical portion is L2, the length of the second transverse portion is L3, the width of the microstrip line is W1, and the center frequency f of the in-band notch of the antennaN The size parameters of the microstrip line are related to the size parameters of the metal patch and the size parameters of the dielectric layer.

[0010]

[0011] Wherein, εr is the dielectric constant of the medium, c is the speed of light in vacuum.

[0012] Optionally, the metal patch is located on the side of the second surface of the dielectric layer close to the feed line, the metal patch is a rectangular structure with a concave side, and the other three sides of the metal patch are aligned with the corresponding three sides of the dielectric layer.

[0013] Optionally, the metal patch includes a rectangular first metal patch and two rectangular second metal patches, and the two second metal patches are symmetrically distributed on the two sides of the first metal patch.

[0014] Optionally, the feed line is a 50-ohm microstrip feed line.

[0015] Optionally, the dielectric constant of the dielectric layer is 3.38, the dielectric loss is 0.0022, and the thickness is 0.2mm, the radio frequency ground layer is a metal layer, and the thickness of the metal layer is 0.035mm.

[0016] Optionally, the cross-shaped slot is a cross-shaped structure composed of two linear slots intersecting perpendicularly, the arm lengths of the cross-shaped slot are equal, the center intersection point of the cross-shaped slot coincides with the midpoint of the radiator, and one of the linear slots of the cross-shaped slot is perpendicular to the first side of the radiator.

[0017] Optionally, the radiator is an octagonal structure.

[0018] The technical scheme of the present application sets the radiator, the feed line and the two microstrip lines at the radiation layer, and sets the metal patch at the radio frequency ground layer; the radiation performance of the planar broadband antenna is determined by the size of the radiator, the bandwidth and the reflection coefficient of the planar antenna are determined by the size parameters of the metal patch and the size parameters of the radiator, and the center frequency of the notch and the isolation at the center frequency of the notch are determined by the size parameters and the position of the microstrip line; the design is a kind of millimeter wave broadband planar antenna, with the advantage of in-band notch, which can effectively suppress in-band interference. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in these drawings without creative labor.

[0020] Figure 1 A schematic diagram of a layered structure of a millimeter wave broadband planar antenna with a notch characteristic according to the present application;

[0021] Figure 2 A schematic diagram of a front view structure of a millimeter wave broadband planar antenna with a notch characteristic according to the present application;

[0022] Figure 3 A schematic diagram of a back view structure of a millimeter wave broadband planar antenna with a notch characteristic according to the present application;

[0023] Figure 4 A schematic diagram of a front view structure of a millimeter wave broadband planar antenna with a notch characteristic according to the present application;

[0024] Figure 5 A schematic diagram of a back view structure of a millimeter wave broadband planar antenna with a notch characteristic according to the present application;

[0025] Figure 6 A schematic diagram of the variation of the standing wave ratio of a millimeter wave broadband planar antenna with a notch characteristic according to the present application with the parameter L1;

[0026] Figure 7 A schematic diagram of the variation of the standing wave ratio of a millimeter wave broadband planar antenna with a notch characteristic according to the present application with the parameter L2;

[0027] Figure 8 A schematic diagram of the variation of the standing wave ratio of a millimeter wave broadband planar antenna with a notch characteristic according to the present application with the parameter L3;

[0028] Figure 9 A schematic diagram of the variation of the standing wave ratio of a millimeter wave broadband planar antenna with a notch characteristic according to the present application with the parameter S;

[0029] Figure 10 A schematic diagram of the variation of the standing wave ratio of a millimeter wave broadband planar antenna with a notch characteristic according to the present application with the parameter W1;

[0030] Figure 11 A schematic diagram of the numerical simulation result of the standing wave ratio of a millimeter wave broadband planar antenna with a notch characteristic according to the present application;

[0031] Figure 12Fig. 1 is a schematic diagram of the simulation results of the maximum gain and radiation efficiency of the millimeter wave broadband planar antenna with a notch characteristic according to the present application;

[0032] Figure 13 Fig. 2 is a schematic diagram of the radiation direction of the millimeter wave broadband planar antenna with a notch characteristic according to the present application at 11.0 GHz;

[0033] Figure 14 Fig. 3 is a schematic diagram of the radiation direction of the millimeter wave broadband planar antenna with a notch characteristic according to the present application at 23.0 GHz;

[0034] Figure 15 Fig. 4 is a schematic diagram of the radiation direction of the millimeter wave broadband planar antenna with a notch characteristic according to the present application at 35.0 GHz.

[0035] Brief Description of the Drawings

[0036] 1, radiation layer; 11, radiator; 111, removal part; 112, cross slot; 113, first side; 12, feed line; 13, microstrip line; 131, first transverse part; 132, second transverse part; 133, vertical part; 2, dielectric layer; 3, radio frequency ground layer; 31, metal patch; 311, first metal patch; 312, second metal patch.

[0037] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0039] It should be noted that when an element is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or indirectly on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0040] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0042] It should be understood that the structure, proportion, size and the like shown in the drawings of the present application are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and do not have technical significance, any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effect and purpose of the present application, should still fall within the scope of the technical content disclosed by the present application.

[0043] Because the millimeter wave broadband planar antenna has the advantages of high transmission rate, low cost, light weight, simple design, high data transmission rate, easy integration with other components, etc., it has attracted widespread attention and in-depth research from scholars and engineers in the industry. However, the millimeter wave broadband planar antennas reported so far often do not have band-notched, and cannot effectively suppress in-band interference, limiting their use in modern wireless communication terminals.

[0044] Therefore, the present application proposes a millimeter wave broadband planar antenna with a notched characteristic, comprising:

[0045] a dielectric layer 2;

[0046] a radiation layer 1 located on the first surface of the dielectric layer 2, the radiation layer 1 being provided with a radiator 11, a feed line 12 and a microstrip line 13, the radiator 11 being provided with a cross-shaped slot 112;

[0047] a radio frequency ground layer 3 located on a second surface of the dielectric layer 2, the radio frequency ground layer 3 being provided with a metal patch 31.

[0048] In the embodiments of the present application, reference Figures 1 to 3 is made to the millimeter wave broadband planar antenna with the wave-trap characteristic, comprising: a dielectric layer 2, which is a circuit board; a radiation layer 1 located on a first surface of the dielectric layer 2 and provided with a radiator 11, a feed line 12 and two microstrip lines 13; and a radio frequency ground layer 3 located on a second surface of the dielectric layer 2 and provided with a metal patch 31.

[0049] Reference Figure 2 is made to the millimeter wave broadband planar antenna with the wave-trap characteristic, comprising: a dielectric layer 2, which is a circuit board; a radiation layer 1 located on a first surface of the dielectric layer 2 and provided with a radiator 11, a feed line 12 and two microstrip lines 13; and a radio frequency ground layer 3 located on a second surface of the dielectric layer 2 and provided with a metal patch 31.

[0050] Reference Figure 2 is made to the millimeter wave broadband planar antenna with the wave-trap characteristic, comprising: a dielectric layer 2, which is a circuit board; a radiation layer 1 located on a first surface of the dielectric layer 2 and provided with a radiator 11, a feed line 12 and two microstrip lines 13; and a radio frequency ground layer 3 located on a second surface of the dielectric layer 2 and provided with a metal patch 31.

[0051] Reference Figure 2 is made to the millimeter wave broadband planar antenna with the wave-trap characteristic, comprising: a dielectric layer 2, which is a circuit board; a radiation layer 1 located on a first surface of the dielectric layer 2 and provided with a radiator 11, a feed line 12 and two microstrip lines 13; and a radio frequency ground layer 3 located on a second surface of the dielectric layer 2 and provided with a metal patch 31.

[0052] Reference Figure 2 is made to the millimeter wave broadband planar antenna with the wave-trap characteristic, comprising: a dielectric layer 2, which is a circuit board; a radiation layer 1 located on a first surface of the dielectric layer 2 and provided with a radiator 11, a feed line 12 and two microstrip lines 13; and a radio frequency ground layer 3 located on a second surface of the dielectric layer 2 and provided with a metal patch 31.

[0053] Reference Figure 3The radio frequency layer 3 is a metal layer, and the metal patch 31 is located on the second surface of the dielectric layer 2 close to the feed line 12. The metal patch 31 is a rectangular structure with one concave side. The metal patch 31 includes a first metal patch 311 and two second metal patches 312. The two second metal patches 312 are symmetrically distributed on the upper and lower sides of the first metal patch 311, thereby forming a rectangular metal patch 31 with one concave side.

[0054] It should be noted that the radiator 11, the feed line 12, the metal patch 31 and the cross slot 112 are symmetric about the horizontal center line of the dielectric layer 2. The radiation performance of the planar broadband antenna is determined by the size of the radiator 11. The bandwidth and the reflection coefficient of the planar antenna are determined by the size parameters of the metal patch 31 and the size parameters of the radiator 11. The center frequency of the notch and the isolation at the center frequency of the notch are determined by the size parameters and the position of the microstrip line 13.

[0055] To more thoroughly illustrate the structure of the present application, a design example is given. In the design example, the dielectric constant of the dielectric layer is 3.38, the dielectric loss is 0.0022, and the thickness is 0.2 mm. The metal layer is copper-plated, and the thickness is 0.035 mm.

[0056] The front and back of the layout of the design example are shown in Figure 4 and Figure 5 .

[0057] Referring to Figure 4 and Figure 5 , the length of the dielectric layer 2 is L A , the height of the dielectric layer 2 is H A , the length of the first metal patch 311 is L GM , the height of the first metal patch 311 is H GM , the length of the second metal patch 312 is L GUD , the height of the second metal patch 312 is H GMD , the length of the radiator 11 is L P , the height of the radiator 11 is H P , the length of the horizontal leg of the removed part 111 of the right-angled triangle is L T , the length of the vertical leg of the removed part 111 of the right-angled triangle is H T , the arm length of the cross slot 112 is L S , and the arm width of the cross slot 112 is W S, the length of the first transverse part 131 is L1, the length of the vertical part 133 is L2, the length of the second transverse part 132 is L3, the width of the microstrip line 13 is W1, the distance between the microstrip line 13 and the feed line 12 is S, and the length of the feed line 12 is L F , the width of the feed line 12 is W F .

[0058] The in-band notch is realized by introducing a transmission zero point through the microstrip line 13, and the frequency corresponding to the transmission zero point, i.e. the center frequency f N of the in-band notch, has the following relationship with the size parameters of the microstrip line 13:

[0059]

[0060] Wherein, εr is the dielectric constant of the medium, and c is the speed of light in vacuum.

[0061] Figures 6 to 10 The effects of the parameters L1, L2, L3, S and W1 on the standing wave ratio of the antenna are shown in Table 1, Table 2, Table 3, Table 4 and Table 5, respectively, as follows:

[0062] Reference Figure 6 With the increase of the parameter L1, in the range less than the center frequency of the notch, the standing wave ratio first remains unchanged and then increases; in the range greater than the center frequency of the notch, the standing wave ratio first increases and then remains unchanged and finally increases; the bandwidth first increases and then decreases; the center frequency of the notch moves down, and the standing wave ratio at the center frequency of the notch increases.

[0063] Reference Figure 7 With the increase of the parameter L2, in the range less than the center frequency of the notch, the standing wave ratio first remains unchanged and then increases; in the range greater than the center frequency of the notch, the standing wave ratio first increases and then remains unchanged and finally increases; the bandwidth decreases; the center frequency of the notch moves down, and the standing wave ratio at the center frequency of the notch first increases and then decreases.

[0064] Reference Figure 8 With the increase of the parameter L3, in the range less than the center frequency of the notch, the standing wave ratio first remains unchanged and then increases; in the range greater than the center frequency of the notch, the standing wave ratio first decreases and then increases and finally remains unchanged; the bandwidth first increases and then decreases; the center frequency of the notch moves down, and the standing wave ratio at the center frequency of the notch decreases.

[0065] Reference Figure 9 With the increase of the parameter S, in the range less than the center frequency of the notch, the standing wave ratio first remains unchanged and then slightly increases; in the range greater than the center frequency of the notch, the standing wave ratio first decreases and then remains unchanged; the bandwidth remains almost unchanged; the center frequency of the notch moves down slightly, and the standing wave ratio at the center frequency of the notch decreases.

[0066] Reference Figure 10As the parameter W1 increases, the standing wave ratio is almost constant in the range smaller than the center frequency of the notch, and the standing wave ratio is first decreased and then constant in the range larger than the center frequency of the notch; the bandwidth is decreased; the center frequency of the notch is slightly decreased, and the standing wave ratio at the center frequency of the notch is decreased.

[0067] An example of design is obtained by optimizing the parameters: L A = 11.5 mm, H A = 11.0 mm, L GM = 3.8 mm, W GM = 9.0 mm, L GUD = 4.3 mm, W GUD = 1.0 mm, L P = 7.0 mm, H P = 9.0 mm, L T = 2.0 mm, H T = 2.0 mm, L S = 2.1 mm, W S = 0.1 mm, L1 = 3.0 mm, L2 = 0.3 mm, L3 = 2.0 mm, W1 = 0.1 mm, S = 0.1 mm, L F = 4.0 mm, W F = 0.4 mm.

[0068] Referring to Figure 11 , the reflection coefficient of the wideband slot antenna after parameter optimization is shown in the figure. As shown in the figure, the bandwidth range with the standing wave ratio less than 2 is 9.3 to 35.7 GHz, the center frequency is 22.5 GHz, the absolute bandwidth is 26.4 GHz, the relative bandwidth is 117.3%, and the wideband characteristics are exhibited; there are four transmission poles in the passband, which are respectively located at 12.1 GHz, 17.5 GHz, 23.8 GHz and 35.3 GHz, which ensures the flatness of the maximum gain and the radiation efficiency in the passband; there is a notch in the passband, which is located at 20.2 GHz, and the notch in the passband can be effectively suppressed.

[0069] Referring to Figure 12 , the simulation result figures of the maximum gain and the radiation efficiency of the antenna are given in the figure. As shown in the figure, in the passband, the average maximum gain is 4.26 dBi, which exhibits the advantage of high maximum gain; in the passband, the average radiation efficiency is 95.8%, which exhibits the advantage of high radiation efficiency; at the center frequency of the notch, the maximum gain is only -7.69 dBi, and the radiation efficiency is 22.89%, which shows that the center frequency of the notch has high isolation characteristics compared with the average maximum gain and the average radiation efficiency in the passband.

[0070] Referring to Figures 13 to 15, respectively, are the radiation patterns of the antenna at 11.0 GHz, 23.0 GHz and 35.0 GHz, respectively, and Figures 13 to 15 It can be seen that the antenna is an omnidirectional antenna.

[0071] The technical scheme of the application sets the radiator, the feed line and the two microstrip lines at the radiation layer, sets the cross slot at the center of the radiator, and sets the metal patch at the radio frequency ground layer; the radiation performance of the planar broadband antenna is determined by the size of the radiator, the bandwidth and the reflection coefficient of the planar antenna are determined by the size parameters of the metal patch and the size parameters of the radiator, and the center frequency of the notch and the isolation at the center frequency of the notch are determined by the size parameters and the position of the microstrip line; the design is a kind of millimeter wave broadband planar antenna, has the advantage of in-band notch, and can effectively suppress in-band interference.

[0072] The above only describes optional embodiments of the application, and does not limit the patent scope of the application, and any equivalent structural transformation, direct / indirect application in other related technical fields within the concept of the application, or within the patent protection scope of the application.

Claims

1. A millimeter-wave broadband planar antenna with notch characteristics, characterized in that, include: Dielectric layer; A radiating layer is located on the first surface of the dielectric layer. The radiating layer is provided with a radiator, a feed line, and a microstrip line. A cross-shaped slot is formed on the radiator. A radio frequency (RF) ground layer is located on the second side of the dielectric layer, and the RF ground layer is provided with a metal patch.

2. The millimeter-wave broadband planar antenna with notch characteristics as described in claim 1, characterized in that, The feed line is disposed on one side of the radiator, and the feed line is perpendicular to the first side of the radiator. One end of the feed line is connected to the first side of the radiator, and the other end of the feed line is aligned with one side of the dielectric layer.

3. The millimeter-wave broadband planar antenna with notch characteristics as described in claim 2, characterized in that, Two microstrip lines are provided, symmetrically distributed on both sides of the feed line. Each microstrip line includes a first horizontal portion, a second horizontal portion, and a vertical portion. The first horizontal portion and the second horizontal portion are both arranged parallel to the feed line, and the vertical portion is arranged perpendicular to the feed line. One end of the vertical portion is connected to one end of the first horizontal portion, and the other end of the vertical portion is connected to one end of the second horizontal portion. The length of the first horizontal portion is greater than the length of the second horizontal portion, and the distance between the first horizontal portion and the feed line is less than the distance between the second horizontal portion and the feed line.

4. The millimeter-wave broadband planar antenna with notch characteristics as described in claim 3, characterized in that, The length of the first horizontal portion is L1, the length of the vertical portion is L2, the length of the second horizontal portion is L3, the width of the microstrip line is W1, and the center frequency f of the antenna's in-band notch is... N The relationship between the dimensional parameters of the microstrip line and the microstrip line is as follows: Where εr is the dielectric constant of the medium, and c is the speed of light in a vacuum.

5. The millimeter-wave broadband planar antenna with notch characteristics as described in claim 2, characterized in that, The metal patch is located on the second surface of the dielectric layer, near the feed line. The metal patch is a rectangular structure with one concave side. The other three sides of the metal patch, excluding the concave side, are aligned with the three corresponding sides of the dielectric layer.

6. The millimeter-wave broadband planar antenna with notch characteristics as described in claim 5, characterized in that, The metal patch includes a rectangular first metal patch and two rectangular second metal patches, with the two second metal patches symmetrically distributed on both sides of the first metal patch.

7. The millimeter-wave broadband planar antenna with notch characteristics as described in claim 1, characterized in that, The feed line is a 50-ohm microstrip feed line.

8. The millimeter-wave broadband planar antenna with notch characteristics as described in claim 1, characterized in that, The dielectric layer has a dielectric constant of 3.38, a dielectric loss of 0.0022, and a thickness of 0.2 mm. The radio frequency ground layer is a metal layer with a thickness of 0.035 mm.

9. The millimeter-wave broadband planar antenna with notch characteristics as described in claim 1, characterized in that, The cross-shaped slit is a cross-shaped structure formed by two straight slits intersecting perpendicularly. The arms of the cross-shaped slits are all of equal length. The center intersection point of the cross-shaped slits coincides with the midpoint of the radiator. One of the straight slits of the cross-shaped slits is perpendicular to the first side of the radiator.

10. The millimeter-wave broadband planar antenna with notch characteristics as described in claim 1, characterized in that, The radiator has an octagonal structure.

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