Low-profile directional circularly-polarized UWB array antenna

Abstract

The utility model discloses a low-profile directional circularly-polarized UWB array antenna which comprises a substrate, a square patch, a power divider and a short circuit column. The substrate comprises a substrate top layer, a substrate middle layer and a substrate bottom layer, a grounding surface structure is arranged at the bottom of the substrate bottom layer, the square patch is arranged on the substrate top layer, and the power divider is arranged on the substrate middle layer and corresponds to the square patch. The two ends of the power divider are connected with the square patches through short circuit columns. By adopting the stacked structure of'square patch-power divider-ground ', the energy coupling can be reduced, and the system isolation can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the antenna technical field suitable for wireless broadband communication system, especially a kind of low profile directional circularly polarized UWB array antenna. BACKGROUND

[0002] With the rapid development of wireless communication technology, various terminal devices are widely used in daily life, and users' demand for mobile communication devices tends to be low profile, miniaturization and circular polarization design. Therefore, developing low profile, miniaturization and circular polarization antenna has become the focus of current research. Indoor positioning antenna must have low profile, high reliability and integrated design while meeting the performance requirements of anti-multipath effect, direction robustness and polarization matching. In addition, the key performance indicators such as bandwidth and gain need to meet the corresponding standards to better meet the needs of users and application scenarios.

[0003] In the current mobile communication system, with the development of portable remote control, small-sized antenna with built-in remote control gradually attracts attention. However, it is challenging to design an antenna that can meet circular polarization characteristics while achieving miniaturization and low profile. Usually, due to the small size of the antenna, the current length and radiation area are significantly reduced, which makes it difficult to achieve wide bandwidth while meeting circular polarization characteristics. In addition, the design of small-sized multi-antenna is also limited. With the decrease of size, the coupling problem between units becomes more prominent.

[0004] Currently, the common methods to achieve circular polarization include single-feed method and double-feed method. The single-feed method usually achieves circular polarization by changing the shape of the radiation patch, but the circular polarization effect is often not ideal. In contrast, the double-feed method usually uses a power divider to achieve better circular polarization effect. The traditional power divider layout is "antenna-ground-power divider", which aims to reduce the coupling between the antenna and the power divider and provide electrical isolation through the intermediate layer ground. However, if there is a circuit on the back of the power divider, it may cause energy coupling, thereby deteriorating performance. To overcome these challenges, the design uses a cut-type square radiation patch, increases a short-circuit column, opens a slot and digs a groove, and adopts an "antenna-power divider-ground" arrangement. The design aims to reduce size constraints, improve bandwidth and radiation efficiency, and achieve circular polarization characteristics. SUMMARY

[0005] The main purpose of the utility model is to provide a low profile directional circularly polarized UWB array antenna that reduces size constraints, improves bandwidth and radiation efficiency, and at the same time achieves circular polarization characteristics by using a cut-type square radiation patch, increasing a short-circuit column, opening a slot and digging a groove, and adopting an "antenna-power divider-ground" arrangement.

[0006] The utility model provides a kind of low profile directional circularly polarized UWB array antenna, including substrate, square patch, power divider and short-circuit column;

[0007] The substrate includes substrate top layer, substrate middle layer and substrate bottom layer, the substrate bottom layer bottom is provided with ground plane structure, the square patch is arranged on the substrate top layer, the power divider is arranged on the substrate middle layer and corresponds with the square patch;

[0008] The power divider both ends are connected with the square patch by the short-circuit column.

[0009] Preferably, the square patch four corners cut off isosceles triangle shape edge and forms square patch inner flange.

[0010] Preferably, the square patch inner flange is provided with patch slot towards the square patch center.

[0011] Preferably, the shape of the patch slot is rectangular.

[0012] Preferably, the power divider is a two-way power divider, the power divider includes first connecting microstrip line, second connecting microstrip line and third connecting microstrip line, the third connecting microstrip line is arranged in the middle of the power divider and is connected with one side surface of the square patch on top by the short-circuit column, the first connecting microstrip line and the second connecting microstrip line are arranged at both ends of the power divider and are connected with the square patch on top by the short-circuit column.

[0013] The low profile directional circularly polarized UWB array antenna has the following advantages:

[0014] 1, by adopting the "square patch-power divider-ground" laminated structure, so as to reduce energy coupling, improve system isolation.

[0015] 2, by setting heat dissipation groove on substrate top layer can improve the heat dissipation performance, so as to improve the reliability of system, can also reduce the mutual interference between two side antennas, and then improve the receiving quality of signal, effectively reduce the influence of multipath effect on positioning accuracy, optimize the overall system effect.

[0016] 3, by setting patch slot on square patch, so as to excite a plurality of different electromagnetic modes. The superposition effect of these electromagnetic modes promotes the antenna to form multiple resonance points, thereby significantly expanding the bandwidth of the antenna, so as to meet the demand of ultra wide band communication. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the top view of the substrate top layer of the low profile directional circularly polarized UWB array antenna of the utility model;

[0018] Figure 2 is a side view of the low-profile directional circularly polarized UWB array antenna of the utility model;

[0019] Figure 3 is a top view of the middle layer of the substrate of the low-profile directional circularly polarized UWB array antenna of the utility model;

[0020] Figure 4 is a standing wave ratio graph of the low-profile directional circularly polarized UWB array antenna of the utility model;

[0021] Figure 5 is a gain peak value graph of the corresponding frequency of the low-profile directional circularly polarized UWB array antenna of the utility model;

[0022] Figure 6 is an isolation degree change graph of the low-profile directional circularly polarized UWB array antenna of the utility model;

[0023] Figure 7 is a directional diagram of the low-profile directional circularly polarized UWB array antenna of the utility model in the center frequency frequency band E face, H face;

[0024] Figure 8 is an axial ratio graph of the low-profile directional circularly polarized UWB array antenna of the utility model;

[0025] In the figure, the reference numerals are: 1, substrate, 2, square patch, 3, power divider, 4, short-circuit column, 11, substrate bottom layer, 12, substrate middle layer, 13, substrate top layer, 21, square patch inner folding edge 31, first connecting microstrip line, 22, patch gap, 32, second connecting microstrip line, 33, third connecting microstrip line, 34, first long microstrip line, 35, second long microstrip line, 36, third long microstrip line, 37, first short microstrip line, 38, second short microstrip line, 39, third short microstrip line, 40, fourth short microstrip line, 41, fifth short microstrip line, 42, sixth short microstrip line, 111, heat dissipation groove.

[0026] The utility model discloses the realization, functional characteristics and advantages will be further explained with reference to the embodiment, and the reference drawing. DETAILED DESCRIPTION

[0027] It should be understood that the specific embodiments described herein are merely intended to explain the utility model, and are not used to limit the utility model.

[0028] Reference Figures 1 to 8 , an embodiment of the low-profile directional circularly polarized UWB array antenna of the utility model is proposed:

[0029] A low-profile directional circularly polarized UWB array antenna, comprising a substrate 1, a square patch 2, a power divider 3 and a short-circuit column 4.

[0030] The substrate 1 comprises a substrate top layer 13, a substrate middle layer 12 and a substrate bottom layer 11, the distance between the substrate top layer 13 and the substrate middle layer 12 is greater than the distance between the substrate middle layer 12 and the substrate bottom layer 11. The substrate bottom layer 11 is provided with a ground plane structure at the bottom. The substrate top layer 13 is provided with a heat dissipation groove 111 in the middle, which can improve the heat dissipation performance, thereby improving the reliability of the system, reducing the mutual interference between the two side antennas, improving the signal reception quality, effectively reducing the influence of multipath effect on positioning accuracy, and optimizing the overall system effect.

[0031] The square patch 2 is symmetrical and arranged on both sides of the heat dissipation groove 111 of the substrate top layer 13. The square patch 2 is cut into an equilateral triangle shape at the four corners and forms a square patch inner folding edge 21. The two square patch inner folding edges 21 on the front are provided with a rectangular patch gap 22 towards the center of the square patch. The setting of the patch gap 22 can excite a variety of different electromagnetic modes. The superposition effect of these electromagnetic modes promotes the antenna to form multiple resonance points, thereby significantly expanding the bandwidth of the antenna and meeting the needs of ultra-wideband communication.

[0032] The power divider 3 is a one-to-two power divider and is provided with two power dividers 3 respectively arranged on the substrate middle layer 12, and the two power dividers 3 correspond to the square patch 2 of the substrate top layer 13 respectively. The power divider 3 comprises a first connecting microstrip line 31, a second connecting microstrip line 32, a third connecting microstrip line 33, a first long microstrip line 34, a second long microstrip line 35, a third long microstrip line 36, a first short microstrip line 37, a second short microstrip line 38, a third short microstrip line 39, a fourth short microstrip line 40, a fifth short microstrip line 41 and a sixth short microstrip line 42.

[0033] The first connecting microstrip line 31 is arranged in the middle of the first long microstrip line 34, and one end of the first connecting microstrip line 31 is connected to one side of the square patch 2 on the top through a shorting post 4. One end of the first long microstrip line 34 on the top is connected to one end of the second long microstrip line 35, and the included angle between the first long microstrip line 34 and the second long microstrip line 35 is 90°. The other end of the second long microstrip line 35 is connected to one end of the first short microstrip line 37, and the included angle between the first short microstrip line 37 and the second long microstrip line 35 is 90°. The other end of the first short microstrip line 37 is connected to one end of the second short microstrip line 38, and the included angle between the first short microstrip line 37 and the second short microstrip line 38 is 90°. The other end of the second short microstrip line 38 is connected to the second connecting microstrip line 32, and the second connecting microstrip line 32 is connected to the square patch 2 on the top through a shorting post 4. Thus, one side of the power divider 3 is formed.

[0034] The first long microstrip line 34 is connected to one end of the third long microstrip line 36 at the bottom, and the included angle between the third long microstrip line 36 and the first long microstrip line 34 is 90°. The other end of the third long microstrip line 36 is connected to one end of the third short microstrip line 39, and the included angle between the third short microstrip line 39 and the third long microstrip line 36 is 90°. The other end of the third short microstrip line 39 is connected to one end of the fourth short microstrip line 40, and the included angle between the third short microstrip line 39 and the fourth short microstrip line 40 is 90°. The other end of the fourth short microstrip line 40 is connected to one end of the fifth short microstrip line 41, and the included angle between the fourth short microstrip line 40 and the fifth short microstrip line 41 is 90°. The other end of the fifth short microstrip line 41 is connected to one end of the sixth short microstrip line 42, and the included angle between the fifth short microstrip line 41 and the sixth short microstrip line 42 is 90°. The other end of the sixth short microstrip line 42 is connected to the third connecting microstrip line 33, and the third connecting microstrip line 33 is connected to the square patch 2 at the top through the shorting post 4. Thus, the other side of the power divider 3 is formed.

[0035] The above description is only preferred embodiments of the present application, and does not limit the patent range of the present application. Any equivalent structural transformation or direct or indirect application in other related technical fields based on the content of the present application is also included in the patent protection range of the present application.

Claims

1. A low profile directive circularly polarized UWB array antenna, characterized in that, comprising a substrate, a square patch, a power divider and a shorting post; the substrate comprises a substrate top layer, a substrate middle layer and a substrate bottom layer, the substrate bottom layer is provided with a ground plane structure at the bottom, the square patch is arranged on the substrate top layer, and the power divider is arranged on the substrate middle layer and corresponds to the square patch; the power divider is connected with the square patch through the shorting post at both ends.

2. The low-profile directional circularly polarized UWB array antenna according to claim 1, wherein, the square patch is cut off the edges of the equilateral triangle shape at the four corners and forms a square patch inner folding edge.

3. The low-profile directional circularly polarized UWB array antenna according to claim 2, wherein, the square patch inner folding edge is provided with a patch slot towards the center of the square patch.

4. The low-profile directional circularly polarized UWB array antenna according to claim 3, wherein, the shape of the patch slot is rectangular.

5. The low-profile directional circularly polarized UWB array antenna according to claim 1, wherein, the power divider is a one-to-two power divider, the power divider comprises a first connecting microstrip line, a second connecting microstrip line and a third connecting microstrip line, the third connecting microstrip line is arranged in the middle of the power divider and connected with one side of the top square patch through the shorting post, and the first connecting microstrip line and the second connecting microstrip line are arranged at both ends of the power divider and connected with the top square patch through the shorting post.

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