Onboard antenna array for angle measurement module

Abstract

The utility model relates to an onboard antenna array used for an angle measurement module, comprising an onboard antenna and an onboard circuit, the onboard antenna comprises three radiation sheets and an antenna array dielectric plate, the radiation sheets are arranged on the antenna array dielectric plate, the onboard circuit comprises a circuit dielectric plate and a circuit metal ground, and the antenna array dielectric plate is arranged on the antenna array dielectric plate. The circuit metal ground is arranged on the circuit dielectric plate, and the antenna array dielectric plate is integrated with the circuit dielectric plate and electrically connected with the circuit metal ground through the antenna array metal ground. The three radiation sheets are arranged on the top layer of the antenna array dielectric plate and are distributed in an equilateral triangle shape, rectangular grooves are formed in the radiation sheets, and the rectangular grooves are arranged in a manner of rotating by 45 degrees. According to the onboard antenna array for the angle measurement module, the antenna production cost can be greatly reduced, the consistency of the antenna array can be effectively ensured, and the angle measurement precision of the angle measurement module is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, in particular to a board-mounted antenna array for an angle measurement module. Background Art

[0002] A conventional ranging module only needs one antenna to complete ranging information. However, since an angle measurement module needs to calculate the arrival wave angle information, multiple antennas are required to form a required topological structure. It is very difficult to ensure the welding and assembly consistency of the antenna array for a conventional external antenna array used for the angle measurement module antenna, resulting in a reduction in angle measurement accuracy.

[0003] Chinese Patent Document CN 111883937 A discloses a method for quickly and accurately adjusting the attitude accuracy of a multi-board planar antenna array, including establishing a measurement and adjustment reference for the antenna array attitude; modularly assembling the multi-board planar antennas, and after each module is assembled, performing rapid testing of the antenna array attitude, analysis and determination of the test results, formulation and adjustment of a quantization adjustment plan in sequence, so that the attitude accuracy of each module after assembly meets the requirements, and finally ensuring that the attitude accuracy of the multi-board planar antenna array meets the requirements. The method for quickly and accurately adjusting the attitude accuracy of the multi-board planar antenna array of the present invention, in combination with the assembly process of the multi-board planar antenna, realizes the peeling analysis of various factors affecting the antenna array attitude accuracy, eliminates the coupling relationship between various influencing factors, and can carry out precise debugging for each influencing factor.

[0004] Therefore, it is necessary to propose a board-mounted antenna array for an angle measurement module, which can not only greatly reduce the production cost of the antenna, but also effectively ensure the consistency of the antenna array and improve the angle measurement accuracy of the angle measurement module. Summary of the Utility Model

[0005] The utility model provides a board-mounted antenna array for an angle measurement module, which can not only greatly reduce the production cost of the antenna, but also effectively ensure the consistency of the antenna array and improve the angle measurement accuracy of the angle measurement module.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is that the board-mounted antenna array for the angle measurement module includes a board-mounted antenna and a board-mounted circuit. The board-mounted antenna includes three radiation patches and an antenna array dielectric board. The radiation patches and the antenna metal ground are both arranged on the antenna array dielectric board. The board-mounted circuit includes a circuit dielectric board and a circuit metal ground. The circuit metal ground is arranged on the circuit dielectric board. The antenna array dielectric board and the circuit dielectric board are integrated together and are electrically connected through an antenna array metal ground and the circuit metal ground.

[0007] With the above technical solution, the on-board antenna array for the angle measurement module can be used in functional modules with angle measurement and ranging requirements. The on-board electronic components are integrated at the tail or bottom of the antenna array, which can better ensure the antenna consistency compared with external antenna arrays. Moreover, a conventional thickness laminated structure dielectric board can meet the antenna performance requirements and greatly reduce the antenna production cost and assembly cost. By integrating the antenna array and the circuit on a conventional laminated structure dielectric board, on the basis of ensuring the performance requirements of the antenna array, not only can the antenna production cost be greatly reduced, but also the antenna array consistency can be effectively guaranteed, and the angle measurement accuracy of the angle measurement module can be improved.

[0008] Preferably, the three radiating elements are arranged on the top layer of the antenna array dielectric board and are distributed in an equilateral triangle. A rectangular slot is provided on the radiating element, and the rectangular slot is rotated by 45°. Such a design not only broadens the antenna impedance bandwidth but also realizes circular polarization radiation.

[0009] Preferably, the antenna array ground plane is arranged in the middle of the antenna array dielectric board; the on-board antenna further includes an antenna array coplanar waveguide ground plane, and the antenna array coplanar waveguide ground plane is arranged on the bottom layer of the antenna array dielectric board.

[0010] Preferably, the on-board antenna further includes three coplanar waveguide lines, and the coplanar waveguide lines are arranged in coplanar waveguide slots; signal holes are provided on the radiating element, and the signal holes electrically connect the radiating element and the coplanar waveguide lines.

[0011] Preferably, the antenna array dielectric board and the circuit dielectric board are integrated together through an integrated dielectric board. The antenna array dielectric board is arranged on the upper part of the integrated dielectric board, and the circuit dielectric board is arranged on the lower part of the integrated dielectric board. The antenna array dielectric board includes a first dielectric board layer, a second dielectric board layer, and a third dielectric board layer. A dielectric board top layer metal is provided on the top of the first dielectric board layer, a dielectric board intermediate layer metal is provided between the first dielectric board layer and the second dielectric board layer, and a circuit ground plane is provided between the second dielectric board and the third dielectric board.

[0012] Preferably, the on-board circuit includes electronic components and circuit lines, and both the electronic components and the circuit lines are arranged on the bottom layer of the circuit dielectric board.

[0013] Preferably, shorting holes are provided at the connection between the antenna array ground plane and the circuit ground plane, and the shorting holes electrically connect the antenna array ground plane, the antenna array coplanar waveguide ground plane, and the circuit ground plane.

[0014] Preferably, the three radiating elements are respectively a first radiating element, a second radiating element and a third radiating element, and the geometric centers among the first radiating element, the second radiating element and the third radiating element are all spaced by half a wavelength; a first rectangular groove is provided on the first radiating element, a second rectangular groove is provided on the second radiating element, and a third rectangular groove is provided on the third radiating element.

[0015] Preferably, the three signal holes are respectively a first signal hole, a second signal hole and a third signal hole, the three coplanar waveguides include a first coplanar waveguide, a second coplanar waveguide and a third coplanar waveguide, and correspondingly, the coplanar waveguide grooves include a first coplanar waveguide groove, a second coplanar waveguide groove and a third coplanar waveguide groove; three circular grooves are provided on the antenna array metal ground, which are respectively a first circular groove, a second circular groove and a third circular groove; the first signal hole passes through the first circular groove to electrically connect the first radiating element and the first coplanar waveguide, the second signal hole passes through the second circular groove to electrically connect the second radiating element and the second coplanar waveguide, and the third signal hole passes through the third circular groove to electrically connect the third radiating element and the third coplanar waveguide.

[0016] Preferably, the integrated dielectric board is made of FR4 material, and the integrated dielectric board is a conventional four-layer stacked structure with a thickness of 1.6 mm. The diameters of the three radiating elements are all 9 mm, the sizes of the three rectangular grooves are all 5.2 mm×1 mm, the size of the antenna array dielectric board is 42 mm×38 mm×1.6 mm, the size of the circuit dielectric board is 15 mm×41 mm×1.6 mm, the center frequency of the antenna is 8 GHz, and S11 is less than -10 dB and the impedance bandwidth is 1 GHz. The use of a stacked structure for the integrated dielectric board can reduce the antenna manufacturing cost.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The on-board antenna array for the angle measurement module integrates the antenna array and the circuit on a conventional stacked structure dielectric board. On the basis of ensuring the antenna bandwidth and radiation requirements, it not only greatly reduces the antenna production cost, but also effectively ensures the consistency of the antenna array and improves the angle measurement accuracy of the angle measurement module. Description of the Drawings

[0018] Figure 1 It is the top view of the antenna array of the on-board antenna array for the angle measurement module of the present invention;

[0019] Figure 2 It is the side view of the antenna array of the on-board antenna array for the angle measurement module of the present invention;

[0020] Figure 3 It is the top view of the on-board antenna array for the angle measurement module of the present invention;

[0021] Figure 4 It is the side view of the on-board antenna array for the angle measurement module of the present invention;

[0022] Figure 5 Structural diagram of the on-board antenna array for the angle measurement module of the present utility model;

[0023] Figure 6 S parameters of the antenna array elements of the on-board antenna array for the angle measurement module of the present utility model;

[0024] Figure 7 Pattern of the antenna array elements of the on-board antenna array for the angle measurement module of the present utility model;

[0025] Figure 8 S parameters of the on-board antenna array for the angle measurement module of the present utility model;

[0026] Wherein: 1 - radiation patch; 101 - radiation patch one; 1011 - rectangular slot one; 102 - radiation patch two; 1021 - rectangular slot two; 103 - radiation patch three; 1031 - rectangular slot three; 2 - signal hole; 201 - signal hole one; 202 - signal hole two; 203 - signal hole three; 3 - circular slot; 301 - circular slot one; 302 - circular slot two; 303 - circular slot three; 4 - coplanar waveguide; 401 - coplanar waveguide one; 4011 - coplanar waveguide slot one; 402 - coplanar waveguide two; 4021 - coplanar waveguide slot two; 403 - coplanar waveguide three; 4031 - coplanar waveguide slot three; 5 - antenna array dielectric board; 501 - dielectric board layer one; 502 - dielectric board layer two; 503 - dielectric board layer three; 504 - top metal of the dielectric board; 505 - middle metal of the dielectric board; 506 - antenna array ground; 6 - integrated dielectric board; 7 - shorting hole; 8 - on-board circuit; 801 - circuit ground; 802 - electronic components; 803 - circuit lines; 9 - on-board antenna; 901 - coplanar waveguide ground of the antenna array; 10 - circuit dielectric board. Specific implementation manner

[0027] The following further describes the technical solution in conjunction with the attached drawings.

[0028] Embodiment: As Figures 1 to 5As shown, the on-board antenna array for the angle measurement module includes an on-board antenna 9 and an on-board circuit 8. The on-board antenna 9 includes three radiation patches 1 and an antenna array dielectric board 5. The radiation patches 1 are arranged on the antenna array dielectric board 9. The on-board circuit 8 includes a circuit dielectric board 10 and a circuit metal ground 801. The circuit metal ground 801 is arranged on the circuit dielectric board 10. An antenna array metal ground 506 is arranged on the antenna array dielectric board 5. The antenna array dielectric board 9 and the circuit dielectric board 10 are integrated together and are electrically connected through the antenna array metal ground 506 and the circuit metal ground 801. The three radiation patches 1 are arranged on the top layer of the antenna array dielectric board 9 and are distributed in an equilateral triangle. A rectangular slot is arranged on the radiation patch 1, and the rectangular slot is set at a rotation of 45°. The antenna array metal ground 506 is arranged in the middle second layer of the antenna array dielectric board 9, that is, the dielectric board layer two 502. The on-board antenna 9 further includes an antenna array coplanar waveguide ground 901, and the antenna array coplanar waveguide ground 901 is arranged on the bottom layer of the antenna array dielectric board 5. The on-board antenna 9 further includes three coplanar waveguide lines 4, and the coplanar waveguide lines 4 are arranged in coplanar waveguide slots. Signal holes 2 are arranged on the radiation patch 1, and the signal holes 2 electrically connect the radiation patch 1 and the coplanar waveguide lines 4. The antenna array dielectric board 5 and the circuit dielectric board 10 are integrated together through an integrated dielectric board 6. The antenna array dielectric board 5 is arranged on the upper part of the integrated dielectric board 6, and the circuit dielectric board 10 is arranged on the lower part of the integrated dielectric board 6. The antenna array dielectric board 5 includes a dielectric board layer one 501, a dielectric board layer two 502 and a dielectric board layer three 503. A dielectric board top layer metal 504 is arranged on the top of the dielectric board layer one 501. A dielectric board intermediate layer metal 505 is arranged between the dielectric board layer one 501 and the dielectric board layer two 502. The circuit metal ground 801 is arranged between the dielectric board two 502 and the dielectric board three 503. The on-board circuit 8 includes electronic components 802 and circuit lines 803, and both the electronic components 802 and the circuit lines 803 are arranged on the bottom layer of the circuit dielectric board 10. A shorting hole 7 is arranged at the connection of the antenna array metal ground 506 and the circuit metal ground 801, and the shorting hole 7 electrically connects the antenna array metal ground 506, the antenna array coplanar waveguide ground 901 and the circuit metal ground 801. The three radiation patches 1 are respectively a radiation patch one 101, a radiation patch two 102 and a radiation patch three 103. The geometric centers between the radiation patch one 101, the radiation patch two 102 and the radiation patch three 103 are all spaced by half a wavelength. A rectangular slot one 1011 is arranged on the radiation patch one 101, a rectangular slot two 1021 is arranged on the radiation patch two 102, and a rectangular slot three 1031 is arranged on the radiation patch three 103.The three signal holes 2 are respectively a signal hole one 201, a signal hole two 202, and a signal hole three 203. The three coplanar waveguides 4 include a coplanar waveguide one 401, a coplanar waveguide two 402, and a coplanar waveguide three 403. Correspondingly, the coplanar waveguide slots include a coplanar waveguide slot one 4011, a coplanar waveguide slot two 4021, and a coplanar waveguide slot three 4031. The antenna array metal ground 506 is provided with three circular slots, namely a circular slot one 301, a circular slot two 302, and a circular slot three 303. The signal hole one 201 passes through the circular slot one 301 to electrically connect the radiation patch one 101 with the coplanar waveguide one 401. The signal hole two 202 passes through the circular slot two 302 to electrically connect the radiation patch two 102 with the coplanar waveguide two 402. The signal hole three 203 passes through the circular slot three 303 to electrically connect the radiation patch three 103 with the coplanar waveguide three 403. The integrated dielectric board 6 is made of FR4 material, and the integrated dielectric board 6 is a conventional four-layer stacked structure with a thickness of 1.6 mm. The diameters of the three radiation patches 1 are all 9 mm, the dimensions of the three rectangular slots are all 5.2 mm X 1 mm, the size of the antenna array dielectric board 5 is 42 mm X 38 mm X 1.6 mm, the size of the circuit dielectric board 10 is 15 mm X 41 mm * 1.6 mm, the center frequency of the antenna is 8 GHz, and S11 is less than -10 dB, and the impedance bandwidth is 1 GHz. The use of a stacked structure for the integrated dielectric board 6 can reduce the antenna manufacturing cost.

[0029] Use ANSYS 2020 software to model, simulate, and optimize the board-mounted antenna array, as Figure 6 is the S parameter of the antenna array, and it can be seen from Figure 6 that the reflection coefficients S11, S22, and S33 are less than -10 dB in the range of 7.5 GHz - 8.5 GHz, and the coupling coefficients S21, S31, and S23 are less than -18 dB in the range of 7.5 GHz - 8.5 GHz. As Figure 7 is the radiation pattern of the antenna array element, and it can be seen from Figure 7 that the antenna has a hemispherical radiation pattern. As Figure 8 is the S parameter of the angle measurement module board-mounted antenna array. It can be seen from Figure 8 that the reflection coefficients S11, S22, and S33 are less than -10 dB in the range of 7.5 GHz - 8.5 GHz, and the coupling coefficients S21, S31, and S23 are less than -17 dB in the range of 7.5 GHz - 8.5 GHz. It can be seen from Figure 8 that the S parameter diagram of the angle measurement module board-mounted antenna array is Figure 6 and Figure 7 compared with the S parameter and radiation pattern of the non-board-mounted antenna array, which are basically the same, indicating that the antenna performance of the antenna array has not decreased due to the board-mounted circuit.

[0030] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present utility model. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc., such as a change in a certain material or size; should be included within the protection scope of the present utility model.

Claims

1. An on-board antenna array for an angle measurement module, characterized in that, It includes an on-board antenna and an on-board circuit. The on-board antenna includes three radiation patches and an antenna array dielectric board. The radiation patches are arranged on the antenna array dielectric board. The on-board circuit includes a circuit dielectric board and a circuit metal ground. The circuit metal ground is arranged on the circuit dielectric board. The antenna array dielectric board and the circuit dielectric board are integrated together and are electrically connected through an antenna array metal ground and the circuit metal ground.

2. The on-board antenna array for the angle measurement module according to claim 1, characterized in that, The three radiation patches are arranged on the top layer of the antenna array dielectric board and are distributed in an equilateral triangle. A rectangular slot is provided on the radiation patch, and the rectangular slot is set at a 45° rotation.

3. The on-board antenna array for the angle measurement module according to claim 1, characterized in that, The antenna array metal ground is arranged in the middle of the antenna array dielectric board. The on-board antenna further includes an antenna array coplanar waveguide ground, and the antenna array coplanar waveguide ground is arranged on the bottom layer of the antenna array dielectric board.

4. The on-board antenna array for an angle measurement module according to claim 3, characterized in that, The on-board antenna further includes three coplanar waveguide lines, and the coplanar waveguide lines are arranged in coplanar waveguide slots. Signal holes are provided on the radiation patches, and the signal holes electrically connect the radiation patches and the coplanar waveguide lines.

5. The on-board antenna array for the angle measurement module according to claim 2, characterized in that, The antenna array dielectric board and the circuit dielectric board are integrated together through an integrated dielectric board. The antenna array dielectric board is arranged on the upper part of the integrated dielectric board, and the circuit dielectric board is arranged on the lower part of the integrated dielectric board.

6. The on-board antenna array for the angle measurement module according to claim 5, characterized in that, The on-board circuit includes electronic components and circuit lines, and both the electronic components and the circuit lines are arranged on the bottom layer of the circuit dielectric board.

7. The on-board antenna array for the angle measurement module according to claim 2, characterized in that, Shorting holes are provided at the connection between the antenna array metal ground and the circuit metal ground, and the shorting holes electrically connect the antenna array metal ground, the antenna array coplanar waveguide ground and the circuit metal ground.

8. The on-board antenna array for an angle measurement module according to claim 7, characterized in that, The three radiation patches are respectively a radiation patch one, a radiation patch two and a radiation patch three. The geometric centers between the radiation patch one, the radiation patch two and the radiation patch three are all spaced by half a wavelength. A rectangular slot one is provided on the radiation patch one, a rectangular slot two is provided on the radiation patch two, and a rectangular slot three is provided on the radiation patch three.

9. The on-board antenna array for the angle measurement module according to claim 8, characterized in that, The three signal holes are respectively a signal hole one, a signal hole two and a signal hole three. The three coplanar waveguide lines include a coplanar waveguide line one, a coplanar waveguide line two and a coplanar waveguide line three. Correspondingly, the coplanar waveguide slots include a coplanar waveguide slot one, a coplanar waveguide slot two and a coplanar waveguide slot three. The antenna array metal ground is provided with three circular slots, which are respectively a circular slot one, a circular slot two and a circular slot three. The signal hole one passes through the circular slot one to electrically connect the radiation patch one and the coplanar waveguide line one. The signal hole two passes through the circular slot two to electrically connect the radiation patch two and the coplanar waveguide line two. The signal hole three passes through the circular slot three to electrically connect the radiation patch three and the coplanar waveguide line three.

10. The on-board antenna array for the angle measurement module according to claim 5, characterized in that, The integrated dielectric board is made of FR4 material. The integrated dielectric board is a four-layer stacked structure with a thickness of 1.6 mm. The diameters of the three radiation patches are all 9 mm. The sizes of the three rectangular slots are all 5.2 mm X 1 mm. The size of the antenna array dielectric board is 42 mm X 38 mm X 1.6 mm. The size of the circuit dielectric board is 15 mm X 41 mm * 1.6 mm. The center frequency of the antenna is 8 GHz, and S11 is less than -10 dB, and the impedance bandwidth is 1 GHz.

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