Antenna unit and communication equipment

Abstract

The embodiment of the utility model relates to the technical field of communication, and discloses an antenna unit and communication equipment, the antenna unit comprises a dielectric substrate, an antenna radiator, a microstrip feeder line and a grounding plate, the antenna radiator is arranged at one side of the dielectric substrate, and the antenna radiator is provided with a cut corner; one end of the micro-strip feeder is connected with the antenna radiator, the other end of the micro-strip feeder is perpendicular to the dielectric substrate, and the micro-strip feeder is provided with a slot; the grounding plate is arranged on the other side of the dielectric substrate, the grounding plate and the antenna radiator are oppositely arranged, and one end of the grounding plate is perpendicular to the dielectric substrate. Through the above mode, the embodiment of the utility model can work in a wider frequency range, thereby realizing the broadband characteristic, and having the advantage of miniaturization.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular to an antenna unit and a communication device. Background Art

[0002] Because ultra-wideband systems occupy an extremely wide frequency band, encompassing many narrowband communication systems, such as the 3.3-3.6 GHz Wireless Local Area Network (WiMAX) and the 8.01-8.5 GHz International Telecommunication Union (ITU) system, these narrowband frequencies can significantly interfere with the normal operation of ultra-wideband systems. To mitigate interference from these narrowband signals, ultra-wideband antennas with notched band characteristics are required. Furthermore, miniaturizing ultra-wideband antennas to meet the increasing miniaturization and portability requirements of today's electronic products is a current research hotspot both domestically and internationally.

[0003] For example, during implementation, the inventors discovered that in order to avoid electromagnetic interference between the ultra-wideband system and the narrowband system, the traditional method is to introduce a band-stop filter into the ultra-wideband system, but this undoubtedly increases the system size, design complexity and cost. Utility Model Content

[0004] The main technical problem solved by the embodiments of the present application is to provide a device that can operate in a wider frequency range, thereby achieving broadband characteristics and having the advantage of miniaturization.

[0005] To solve the above technical problems, a technical solution adopted in an embodiment of the present application is: providing an antenna unit, comprising: a dielectric substrate, an antenna radiator, a microstrip feeder and a ground plane, wherein the antenna radiator is arranged on one side of the dielectric substrate, and the antenna radiator is provided with a cut corner; one end of the microstrip feeder is connected to the antenna radiator, and the other end of the microstrip feeder is perpendicular to the dielectric substrate, and the microstrip feeder is provided with a slot; the ground plane is arranged on the other side of the dielectric substrate, the ground plane is arranged opposite to the antenna radiator, and one end of the ground plane is perpendicular to the dielectric substrate.

[0006] Optionally, the slot includes a first rectangular slot, a second rectangular slot and a third rectangular slot, and two ends of the second rectangular slot are respectively connected to the first rectangular slot and the third rectangular slot.

[0007] Optionally, the slot is a "C"-shaped slot.

[0008] Optionally, there are multiple cut angles, and one cut angle and another cut angle are symmetrical about the center point of the antenna radiator.

[0009] Optionally, the antenna radiator includes a first trapezoidal radiating portion, a second trapezoidal radiating portion and a rectangular radiating portion, the rectangular radiating portion is connected to the first trapezoidal radiating portion and the second trapezoidal radiating portion respectively, and the rectangular radiating portion is connected to the microstrip feeder, and one end of the microstrip feeder is vertically connected to one side of the dielectric substrate.

[0010] Optionally, the antenna radiator, the dielectric substrate and the ground plane are stacked in sequence.

[0011] Optionally, the antenna radiator and the ground plane are both symmetrical in vertical direction with respect to a horizontal line passing through a center point of the dielectric substrate.

[0012] Optionally, the microstrip feed line is a 50-ohm microstrip feed line.

[0013] Optionally, the ground plate is arranged in a rectangular shape.

[0014] In order to solve the above technical problems, another technical solution adopted in the embodiment of the present application is: providing a communication device, including any of the above antenna units.

[0015] An embodiment of the present application provides an antenna unit, comprising: a dielectric substrate, an antenna radiator, a microstrip feeder, and a ground plane, wherein the antenna radiator is arranged on one side of the dielectric substrate and is provided with a cut corner; one end of the microstrip feeder is connected to the antenna radiator, the other end of the microstrip feeder is perpendicular to the dielectric substrate, and the microstrip feeder is provided with a slot; the ground plane is arranged on the other side of the dielectric substrate, the ground plane is arranged opposite to the antenna radiator, and one end of the second metal layer is perpendicular to the dielectric substrate. By providing a chamfer on the radiator and combining it with the slot, the resonant characteristics of the rectangular radiating patch can be changed, so that it can operate in a wider frequency range, thereby achieving broadband characteristics and having the advantage of miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0017] Figure 1 is an exploded view of the antenna unit according to an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of an antenna unit according to an embodiment of the present application;

[0019] Figure 3 is a plan view of the antenna unit according to an embodiment of the present application;

[0020] Figure 4 is another planar layout of the antenna unit according to an embodiment of the present application;

[0021] Figure 5 The reflection coefficient of the antenna unit in the embodiment of the present application varies with different W G Graph of changes in

[0022] Figure 6 The reflection coefficient of the antenna unit in the embodiment of the present application varies with different W T Graph of changes in

[0023] Figure 7 The reflection coefficient of the antenna unit in the embodiment of the present application changes with different H T Graph of changes in

[0024] Figure 8 The reflection coefficient of the antenna unit in the embodiment of the present application changes with different L RU Graph of changes in

[0025] Figure 9 The reflection coefficient of the antenna unit in the embodiment of the present application changes with different L SR Graph of changes in

[0026] Figure 10 The reflection coefficient of the antenna unit in the embodiment of the present application changes with different L SD Graph of changes in

[0027] Figure 11 The reflection coefficient of the antenna unit in the embodiment of the present application varies with different W S Graph of changes in

[0028] Figure 12 This is a simulation diagram of the reflection coefficient results of the antenna unit of the embodiment of the present application;

[0029] Figure 13 This is a simulation result diagram of the maximum gain and radiation efficiency of the antenna unit in the embodiment of the present application.

[0030] The figure numbers in the specific implementation manner are as follows: 100, antenna unit; 10, dielectric substrate; 20, antenna radiator; 201, cut corner; 202, first trapezoidal radiating portion; 203, second trapezoidal radiating portion; 204, rectangular radiating portion; 30, microstrip feed line; 301, slot; 40, ground plate; 311, first rectangular slot; 312, second rectangular slot; 314, third rectangular slot. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed on" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as being "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "upper", "lower", "inside", "outside", "vertical", "horizontal", etc. used in this specification indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0033] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0034] See also Figure 1The antenna unit 100 includes: a dielectric substrate 10, an antenna radiator 20, a microstrip feeder 30 and a ground plane 40. The antenna radiator 20 is arranged on one side of the dielectric substrate 10 and is provided with a cut corner 201; one end of the microstrip feeder 30 is connected to the antenna radiator 20, and the other end of the microstrip feeder 30 is perpendicular to the dielectric substrate 10, and the microstrip feeder 30 is provided with a slot 301; the ground plane 40 is arranged on the other side of the dielectric substrate 10, and the ground plane 40 is arranged opposite to the antenna radiator 20, and one end of the ground plane 40 is perpendicular to the dielectric substrate 10, which helps to ensure the performance consistency of the antenna in different directions and avoid directional deviation. In some embodiments, the main resonant frequency of the radiator depends on its size and shape. By setting the cut angle 201, the effective area and shape of the radiator will be changed, thereby changing its resonant frequency. The cut angle 201 is equivalent to introducing multiple small capacitors and inductors, which can affect the overall impedance and resonance characteristics of the radiator, thereby changing the resonant frequency. In addition, in the embodiment of the present application, the notch frequency is mainly determined by the said size parameters. By adjusting the length of the horizontal part and the vertical part of the slot 301, the position of the notch frequency can be changed to achieve in-band notching, effectively suppress the in-band interference of specific frequencies, and improve antenna performance.

[0035] In the embodiment of the present application, the antenna radiator 20, the dielectric substrate 10 and the ground plate 40 are stacked in sequence. The antenna radiator 20 and the ground plate 40 are symmetrical about the horizontal line passing through the center point of the dielectric substrate 10, which helps to reduce the cross-polarization of the antenna unit 100 in the horizontal plane and improve the radiation efficiency and directivity of the antenna unit 100.

[0036] In the embodiment of the present application, the ground plate 40 is arranged in a rectangular shape.

[0037] In the embodiment of the present application, the microstrip feed line 30 is a 50-ohm microstrip feed line 30 .

[0038] See also Figure 2 The slot 301 includes a first rectangular slot 311, a second rectangular slot 312 and a third rectangular slot 314. The two ends of the second rectangular slot 312 are respectively connected to the first rectangular slot 311 and the third rectangular slot 314. In addition, the slot 301 is a "C"-shaped slot. The above structure can introduce a notch characteristic, which can suppress the radiation of certain unnecessary frequency bands, such as the Wi-Fi band, thereby improving the performance of the antenna in specific applications.

[0039] Please continue reading Figure 2The antenna radiator 20 includes a first trapezoidal radiating portion 202, a second trapezoidal radiating portion 203 and a rectangular radiating portion 204. The rectangular radiating portion 204 is connected to the first trapezoidal radiating portion 202 and the second trapezoidal radiating portion 203 respectively, and the rectangular radiating portion 204 is connected to the microstrip feeder 30. One end of the microstrip feeder 30 is vertically connected to one side of the dielectric substrate 10. There are multiple cut corners 201, and one cut corner 201 and another cut corner 201 are symmetrical about the center point of the antenna radiator 20. Through the above arrangement, the current distribution unevenness inside the antenna unit 100 can be reduced, the loss inside the antenna can be reduced, thereby improving the radiation efficiency and maximum gain of the antenna, and the cut corner 201 is equivalent to introducing multiple small capacitors and inductors, which can affect the overall impedance and resonance characteristics of the radiator, thereby changing the resonant frequency.

[0040] In the embodiment of the present application, the dielectric constant of the dielectric substrate 10 is 3.38. In the embodiment of the present application, the dielectric constant of the dielectric substrate 10 is 3.38, the dielectric loss is 0.0022, and the thickness is 0.762mm; the antenna radiator 20 is copper-plated and has a thickness of 0.762mm. The front and back of the design example layout of the antenna unit 100 are as follows: Figure 3 and 4 As shown. Among them, L A is the length of the antenna unit 100, W A is the width of the antenna unit 100, L G is the length of the ground plate 40, W G is the width of the ground plate 40, L S is the length of the radiation patch 201, L P is the length of the antenna radiator 20, W P is the width of the antenna radiator 20, H T H is the length of the cut corners subtracted from the antenna radiator 20. T L is the width of antenna radiator 20 minus 201. SU is the length of the upper part of the slot 301, L SR is the length of the middle part of the slot 301, L SD is the length of the lower half of the slot 301, W S is the width of the slot 301, L F The characteristic impedance of the microstrip feed line is 50Ω, and the length is 30W. F is the width of the microstrip feed line 30 with a characteristic impedance of 50Ω. In order to obtain a broadband antenna with good performance, the core parameter L G , L T 、、W G To study the impact of the antenna unit 100 on performance, it is necessary to adjust the core parameter W to obtain an ultra-wideband antenna with excellent performance.G 、W T 、H T , L SU , L SR , L SD 、W S Research on the influence of antenna reflection coefficient, such as Figure 5-13 shown.

[0041] Depend on Figure 5 It can be seen that as the parameter W G As the frequency increases, the reflection coefficient first improves and then deteriorates in the passband smaller than the notch center frequency; in the passband larger than the notch center frequency, the reflection coefficient improves; the passband becomes wider; the notch center frequency remains almost unchanged, and the isolation at the notch center frequency remains almost unchanged.

[0042] Depend on Figure 6 It can be seen that as the parameter W T As the frequency increases, the reflection coefficient becomes better in the passband less than the notch center frequency; in the passband greater than the notch center frequency, the reflection coefficient deteriorates; the passband bandwidth becomes narrower; the notch center frequency almost becomes smaller, and the notch center frequency remains almost unchanged.

[0043] Depend on Figure 7 It can be seen that as the parameter H T As the frequency becomes larger, its reflection coefficient becomes better in the passband less than the notch center frequency; its reflection coefficient becomes better in the passband greater than the notch center frequency; the passband bandwidth becomes larger; the notch center frequency remains almost unchanged, and the isolation at the notch center frequency remains almost unchanged.

[0044] Depend on Figure 8 It can be seen that as the parameter L RU As the frequency increases, the reflection coefficient deteriorates in the passband smaller than the notch center frequency; the reflection coefficient deteriorates slightly in the passband larger than the notch center frequency; the passband bandwidth becomes slightly narrower; the notch center frequency moves downward, and the isolation at the notch center frequency becomes slightly smaller.

[0045] Depend on Figure 9 It can be seen that as the parameter L SR As the frequency increases, the reflection coefficient deteriorates in the passband less than the notch center frequency; the reflection coefficient improves in the passband greater than the notch center frequency; the passband bandwidth becomes slightly wider; the notch center frequency moves downward, and the isolation at the notch center frequency becomes larger.

[0046] Depend on Figure 10 It can be seen that as the parameter L SD As the frequency increases, the reflection coefficient deteriorates in the passband less than the notch center frequency; the reflection coefficient remains almost unchanged in the passband greater than the notch center frequency; the passband bandwidth remains unchanged; the notch center moves downward, and the isolation at the notch center frequency remains almost unchanged.

[0047] Depend on Figure 11 It can be seen that as the parameter W S As the notch center frequency increases, its reflection coefficient slightly improves within the passband below the notch center frequency; within the passband above the notch center frequency, its reflection coefficient remains almost unchanged; the passband bandwidth remains unchanged; as the notch center frequency increases slightly, the isolation at the notch center frequency first increases slightly and then decreases slightly. By optimizing its parameters, a design example can be obtained: L A =30.0mm,W A =30.0mm,L G =30.0mm,W G =9.5mm,L P =28.0mm,W P =19.0mm,W T =8.0mm,8 T =2.0mm,L SU =7.0mm,L SR =0.8mm,L SD =6.0mm,W S =0.1mm,L F =10.0mm,W F =1.8mm. The reflection coefficient of the broadband slot antenna after parameter optimization is as follows Figure 13 As shown in the figure, the bandwidth with a reflection coefficient less than -10dB is from 3.4 to 12.8GHz, with a center frequency of 8.1GHz, an absolute bandwidth of 9.4GHz, and a relative bandwidth of 116%, demonstrating ultra-wideband characteristics. Within the passband, there are three transmission poles located at 4.9GHz, 9.6GHz, and 12.1GHz, ensuring maximum gain and flatness of radiation efficiency within the passband. There is also a transmission zero at 7.7GHz at the notch, which effectively suppresses in-band interference at this frequency.

[0048] An embodiment of the present application provides an antenna unit 100, comprising: a dielectric substrate 10, an antenna radiator 20, a microstrip feeder 30, and a ground plane 40. The antenna radiator 20 is arranged on one side of the dielectric substrate 10, and is provided with 201. One end of the microstrip feeder 30 is connected to the antenna radiator 20, and the other end of the microstrip feeder 30 is perpendicular to the dielectric substrate 10. The microstrip feeder 30 is provided with a slot 301. The ground plane 40 is arranged on the other side of the dielectric substrate 10, and is arranged opposite to the antenna radiator 20. One end of the second metal layer is perpendicular to the dielectric substrate 10. By providing a chamfer on the antenna radiator 20 and combining it with the slot 301, the resonant characteristics of the rectangular radiation patch can be changed, so that it can operate in a wider frequency range, thereby achieving broadband characteristics and having the advantage of miniaturization.

[0049] The present application also provides an embodiment of a communication device, which includes the above-mentioned antenna unit 100100. The specific structure and function of the antenna unit 100100 can be found in the above-mentioned embodiment and will not be repeated here.

[0050] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An antenna unit, characterized in that: include: dielectric substrate; An antenna radiator is provided on one side of the dielectric substrate, and the antenna radiator is provided with a cut corner; A microstrip feeder, one end of which is connected to the antenna radiator, the other end of which is perpendicular to the dielectric substrate, and the microstrip feeder is provided with a slot; A ground plate is arranged on the other side of the dielectric substrate. The ground plate is arranged opposite to the antenna radiator, and one end of the ground plate is perpendicular to the dielectric substrate.

2. The antenna unit according to claim 1, wherein: The slots include a first rectangular slot, a second rectangular slot and a third rectangular slot, and two ends of the second rectangular slot are respectively connected to the first rectangular slot and the third rectangular slot.

3. The antenna unit according to claim 2, wherein: The slot is a "C"-shaped slot.

4. The antenna unit according to claim 1, wherein: There are multiple cut angles, and one cut angle and another cut angle are symmetrical about the center point of the antenna radiator.

5. The antenna unit according to claim 1, wherein: The antenna radiator includes a first trapezoidal radiating portion, a second trapezoidal radiating portion and a rectangular radiating portion, the rectangular radiating portion is connected to the first trapezoidal radiating portion and the second trapezoidal radiating portion respectively, and the rectangular radiating portion is connected to the microstrip feeder, and one end of the microstrip feeder is vertically connected to one side of the dielectric substrate.

6. The antenna unit according to claim 1, wherein: The antenna radiator, dielectric substrate and ground plate are stacked in sequence.

7. The antenna unit according to claim 1, wherein: The antenna radiator and the ground plane are both vertically symmetrical about a horizontal line passing through the center point of the dielectric substrate.

8. The antenna unit according to claim 1, wherein: The microstrip feed line is a 50-ohm microstrip feed line.

9. The antenna unit according to claim 1, wherein: The grounding plate is arranged in a rectangular shape.

10. A communication device, characterized in that: The antenna unit comprises the antenna unit according to any one of claims 1 to 9.

Images