A high-isolation dual-polarized array antenna based on HISL

Abstract

This invention discloses a high-isolation dual-polarized array antenna based on HISL (Hybrid Integrated Suspension Line) technology. The feeding network employs a dual-layer hybrid integrated suspension line (HISL) structure to achieve high isolation. The antenna comprises layers S1-S10, with layers S2-S6 forming HISL structure 1 and S6-S10 forming HISL structure 2. Utilizing an orthogonal dual-layer HISL feeding structure effectively improves the polarization isolation of the dual-polarized array antenna. As shown in the figure, the proposed dual-polarized array antenna achieves polarization isolation below -65 dB within a 26.5-40 GHz operating bandwidth. By adding a metal grid structure above the top-layer radiating structure, coupling between array elements is effectively reduced, thereby increasing the gain, achieving a maximum gain of 21 dBi in each polarization direction.

Description

Technical Field

[0001] This invention relates to the field of array antenna technology, and specifically to a high-isolation dual-polarized array antenna based on HISL. Background Technology

[0002] In 5G and 6G wireless communication systems, antennas, as key components for receiving and transmitting electromagnetic waves, play a crucial role in mobile communications, aerospace, and navigation. Dual-polarized antennas are widely used in wireless communication devices because they effectively increase channel capacity and combat multipath fading. Polarization isolation, or port isolation, is a critical factor in the design of dual-polarized antennas. However, with the increasing capacity of next-generation communication systems, the growing number of users, and the increasing complexity of coupling scenarios, traditional dual-polarized antenna designs struggle to meet isolation requirements. Summary of the Invention

[0003] To effectively improve the polarization isolation of dual-polarized antennas, the present invention aims to propose a high-isolation dual-polarized array antenna based on HISL using hybrid integrated suspended line (HISL) technology, thereby improving the polarization isolation of the dual-polarized antenna.

[0004] To achieve the objectives of this invention, the technical solution provided by this invention is as follows:

[0005] A high-isolation dual-polarized array antenna based on HISL is proposed, which adopts a dual-layer hybrid integrated suspension line HISL structure design for the feed network to achieve high isolation.

[0006] The antenna includes layers S1-S10, layers S2 to S6 are HISL structure 1, and layers S6 to S10 are HISL structure 2.

[0007] The antenna array consists of several layers: S1 is a metal isolation structure, S2 is a radiating structure, S3 and S5 are cavity structures in the Y-polarization direction, S4 is a feed network structure in the Y-polarization direction, S6 is a coupling structure in the X-polarization direction, S7 and S9 are cavity structures in the X-polarization direction, S8 is a feed network in the X-polarization direction, and S10 is the ground of the antenna array. The excitation signal excites the Y-polarization feed network, then reaches the radiating structure to achieve radiation. Similarly, the excitation signal excites the X-polarization feed network, then passes through the coupling structure in layer S6 and reaches layer S4, ultimately exciting the radiating structure to achieve radiation.

[0008] The S1 layer is a metal grid placed on the antenna radiation structure. There are 16 identical antenna elements on the array radiation structure. Each antenna element consists of four patches, and each patch is loaded with five metallized vias that are connected to the metal of the S2 layer substrate.

[0009] In the S2 layer, each unit on the bottom metal structure corresponds to a cross-shaped slot below it.

[0010] Among them, the S3 layer and S5 layer are cavity metal structures that control the feed network in the Y polarization direction. They have the same structure, and each small cavity structure corresponds to an antenna element. The honeycomb cavity structure keeps the feed structure of each element independent.

[0011] The S4 layer consists of a 1-to-16 power divider and 16 cross-shaped patches.

[0012] S6 is the coupling structure of the dual-polarized array x-polarized feed structure. Each unit corresponds to a coupling structure. The coupling structure is realized by loading circular slots at both ends of the slot. Metallized through holes are loaded on both sides of the slot to suppress other modes from affecting the radiation performance.

[0013] The S8 layer is the feed network in the X-polarization direction, which includes a 1-to-16 power divider and 16 rectangular patches. The excitation signal is coupled from S8 to the radiation structure of the antenna array through S6, thereby realizing radiation.

[0014] The array's power supply network uses a T-type power divider for power supply.

[0015] Compared with the prior art, the present invention has the following technical effects:

[0016] The polarization isolation of a dual-polarization array antenna can be effectively improved by utilizing an orthogonal double-layer HISL feeding structure, as shown in the figure. The proposed dual-polarization array antenna achieves a polarization isolation of less than -65 dB within the 26.5–40 GHz operating bandwidth. By adding a metal grid structure above the top-layer radiating structure, the coupling between array elements is effectively reduced, thereby increasing the gain and achieving a maximum gain of 21 dBi in each polarization direction. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a high-isolation dual-polarization array antenna based on HISL provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the metal isolation structure of the HISL dual-polarized array antenna provided in an embodiment of the present invention;

[0019] Figure 3This is a schematic diagram of the upper and lower metal structures of the HISL dual-polarized array antenna radiation structure provided in an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the Y-polarized metal cavity structure of the HISL dual-polarized array antenna provided in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the Y-polarized feed network structure of the HISL dual-polarized array antenna provided in an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the X-polarization coupling structure of the HISL dual-polarization array antenna provided in an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the X-polarized metal cavity structure of the HISL dual-polarized array antenna provided in an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the X-polarization feed network structure of the HISL dual-polarization array antenna provided in an embodiment of the present invention;

[0025] Figure 9 This refers to the bandwidth of the dual-polarized array antenna provided in this embodiment of the invention;

[0026] Figure 10 This refers to the polarization isolation of the dual-polarized array antenna provided in this embodiment of the invention;

[0027] Figure 11 This is the radiation pattern of the dual-polarized array antenna y-polarization at 30GHz provided in an embodiment of the present invention;

[0028] Figure 12 This is the radiation pattern of the dual-polarized array antenna x-polarization at 30GHz provided in an embodiment of the present invention;

[0029] Figure 13 This is the gain curve of the dual-polarized array antenna provided in this embodiment of the invention as a function of frequency. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1-13As shown, this embodiment provides a high-isolation dual-polarized array antenna based on HISL. It employs a dual-layer hybrid integrated suspension line (HISL) structure to design the feed network and achieve high isolation. The three-dimensional structure of the antenna array is shown below. Figure 1 As shown in the diagram. Layer S1 is a metal isolation structure, layer S2 is a radiating structure, layers S3 and S5 are cavity structures in the Y-polarization direction, layer S4 is a feed network structure in the Y-polarization direction, layer S6 is a coupling structure in the X-polarization direction, layers S7 and S9 are cavity structures in the X-polarization direction, layer S8 is a feed network in the X-polarization direction, and layer S10 is the ground of the antenna array. The excitation signal excites the Y-polarization feed network, then reaches the radiating structure to achieve radiation; the excitation signal excites the X-polarization feed network, then passes through the coupling structure of layer S6 and reaches layer S4, thus exciting the radiating structure to achieve radiation.

[0032] The general form of hybrid integrated suspension lines is that the cavity structure is made of pure metal material, the intermediate layer of the main circuit is made of dielectric substrate material, and they are integrated by pressing.

[0033] Specifically, the antenna's specific structure is as follows: Figures 1-13 As shown, the antenna has metal structures in layers S1, S3, S5, S7, S9, and S10, and dielectric substrates in layers S2, S4, S6, and S8. Layers S2 and S8 are Rogers 4350B, and layer S6 is FR4. Layers S2 to S6 form HISL structure 1, and layers S6 to S10 form HISL structure 2.

[0034] The antenna array employs a dual HISL structure to achieve dual polarization control.

[0035] Specifically, layer S1 is a metal grid placed on top of the antenna radiating structure. S2_1 consists of 16 identical antenna elements on the array radiating structure. Each element comprises four patches, each patch having five metallized vias connected to the metal of the S2 layer substrate. Each element on the bottom metal structure of layer S2 has a corresponding cross-shaped slot below it. S3 and S5 are cavity metal structures controlling the Y-polarization direction feed network; their structures are identical. Figure 4As shown, the metal within the frame is cut to form a cavity structure. Each small cavity structure corresponds to an antenna element, and the honeycomb cavity structure ensures that the feeding structure of each element remains independent. S4 is the dual-polarized array y-polarized feeding network structure. It mainly consists of a 1-to-16 power divider and 16 cross-shaped patches. S6 is the coupling structure of the dual-polarized array x-polarized feeding structure. Each element corresponds to a coupling structure, which is mainly achieved by loading circular slots at both ends of the slots. Metallized vias are loaded on both sides of the slots to suppress other modes from affecting the radiation performance. Layers S7 and S9 are cavity structures that control the feeding network in the X-polarization direction. Layer S8 is the feeding network in the X-polarization direction, mainly implemented by a 1-to-16 power divider and 16 rectangular patches. The excitation signal is coupled from S8 (dual-polarized array x-polarized feeding network structure) through S6 to the radiation structure of the antenna array, thereby achieving radiation.

[0036] The array's power supply network uses a T-type power divider, but other types of power divider networks, such as Wilkinson power dividers, can also be selected.

[0037] Finally, it should be noted that the above embodiments are merely illustrative and explanatory of the present invention, and are not intended to limit the present invention to the scope of the described embodiments. Furthermore, those skilled in the art will understand that the present invention is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of the present invention, all of which fall within the scope of protection claimed by the present invention.

Claims

1. A high-isolation dual-polarized array antenna based on HISL, characterized in that, The power supply network adopts a dual-layer hybrid integrated suspension line (HISL) structure design to achieve high isolation. The antenna includes layers S1-S10, layers S2 to S6 are HISL structure 1, and layers S6 to S10 are HISL structure 2. The antenna array consists of several layers: S1 is a metal isolation structure, S2 is a radiating structure, S3 and S5 are cavity structures in the Y-polarization direction, S4 is a feed network structure in the Y-polarization direction, S6 is a coupling structure in the X-polarization direction, S7 and S9 are cavity structures in the X-polarization direction, S8 is a feed network in the X-polarization direction, and S10 is the ground of the antenna array. The excitation signal excites the Y-polarization feed network, then reaches the radiating structure to achieve radiation. Similarly, the excitation signal excites the X-polarization feed network, then passes through the coupling structure in layer S6 and reaches layer S4, ultimately exciting the radiating structure to achieve radiation.

2. The high-isolation dual-polarized array antenna based on HISL according to claim 1, characterized in that, The S1 layer is a metal grid placed on the antenna radiating structure. There are 16 identical antenna elements on the array radiating structure. Each antenna element consists of four patches, and each patch is loaded with 5 metallized vias, which are connected to the metal of the S2 layer substrate.

3. The high-isolation dual-polarized array antenna based on HISL according to claim 2, characterized in that, On the bottom metal structure of the S2 layer, each unit has a corresponding cross-shaped slot below it.

4. A high-isolation dual-polarized array antenna based on HISL according to claim 3, characterized in that, Layers S3 and S5 are cavity metal structures that control the feed network in the Y-polarization direction. They have the same structure, with each small cavity structure corresponding to an antenna element. The honeycomb cavity structure keeps the feed structure of each element independent.

5. A high-isolation dual-polarized array antenna based on HISL according to claim 4, characterized in that, The S4 layer consists of a 1-to-16 power divider and 16 cross-shaped patches.

6. A high-isolation dual-polarized array antenna based on HISL according to claim 5, characterized in that, S6 is a coupling structure for a dual-polarized array x-polarized feed structure. Each unit corresponds to a coupling structure. The coupling structure is achieved by loading circular slots at both ends of the slot. Metallized vias are loaded on both sides of the slot to suppress other modes from affecting radiation performance.

7. A high-isolation dual-polarized array antenna based on HISL according to claim 6, characterized in that, The S8 layer is the feed network in the X-polarization direction, which includes a 1-to-16 power divider and 16 rectangular patches. The excitation signal is coupled from S8 to the radiation structure of the antenna array through S6, thereby realizing radiation.

8. A high-isolation dual-polarized array antenna based on HISL according to claim 7, characterized in that, The array's power supply network uses a T-type power divider for power supply.

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