Structure for enhancing coupling stability of a coaxial feed antenna array coupling calibration network

Abstract

The application provides a structure for enhancing the coupling stability of a coaxial feed antenna array coupling calibration network, comprising a dielectric substrate, a coupling calibration network and an antenna, the coupling calibration network is arranged inside the dielectric substrate, a metalized via is formed on the dielectric substrate, the antenna is arranged in the metalized via, the metalized via is divided into left and right two circular arc surfaces, a rectangular slot structure is formed on the upper layer of the left circular arc surface, a semicircular ring slot structure is formed on the lower layer of the left circular arc surface, and the end of the coupling calibration network is conformal to the left circular arc surface. Compared with the metal rod / metalized via structure and the hair button structure, the coupling calibration network of the application has high stability, small fluctuation and small phase deviation.

Description

Technical Field

[0001] This invention relates to the field of coupling calibration networks, and in particular to structures that enhance the coupling stability of coupling calibration networks for coaxial-fed antenna arrays. Background Technology

[0002] Coupled calibration networks enable the detection and calibration of input signals in radio frequency channels, requiring stable amplitude and phase consistency. In large-scale antenna arrays, the stability of coupled calibration networks is a core technical challenge that needs to be addressed. In antenna arrays, calibration networks are often designed as multi-layered stripline transmission line structures, with proper signal shielding for both in-level and upstream / downstream circuits.

[0003] In a coaxial-fed antenna array, the coupling method of the calibration network can employ a metal rod / metallized via structure (e.g., Figure 1 , Figure 2 (as shown) and the structure of the hair button (as shown) Figure 3 , Figure 4 As shown, the array consists of an antenna radiating patch, a feed connector, a ground plane, and a calibration network.

[0004] This approach has the following shortcomings:

[0005] 1. The processing technology is complex and difficult: it involves multi-layer board insertion and blind hole metallization, which is prone to errors and leads to instability of the coupling calibration network.

[0006] 2. Significant impact from the same level circuit: The use of a button structure requires printing a section of microstrip line, which can easily interfere with the calibration network, making the calibration network unstable.

[0007] 3. The phase difference between the metal rod / metallized through-hole structure and the rough button structure is large. Summary of the Invention

[0008] The purpose of this invention is to provide a structure that enhances the coupling stability of a coaxial-fed antenna array coupling calibration network, thereby solving the problems of low stability and large fluctuations in existing coupling calibration networks with metal rod / metallized via structures and button structures.

[0009] The objective of this invention is achieved through the following technical solution:

[0010] A structure for enhancing the coupling stability of a coaxial-fed antenna array coupling calibration network includes a dielectric substrate, a coupling calibration network, and an antenna. The coupling calibration network is disposed inside the dielectric substrate, and a metallized via is formed on the dielectric substrate. The antenna passes through the metallized via, which is divided into two arc surfaces, left and right. A rectangular groove structure is formed in the upper layer of the left arc surface, and a semi-circular annular groove structure is formed in the lower layer of the left arc surface. The end of the coupling calibration network conforms to the left arc surface.

[0011] As a further technical solution, a cuboid with a width of 0.15 mm and the same depth as the metallized via is formed on the dielectric substrate, and the cuboid divides the metallized via into two arc surfaces, left and right.

[0012] As a further technical solution, the cuboid is positioned at 1 / 4 of the metallized via ring.

[0013] As a further technical solution, the upper layer of the left arc surface is specifically designed to have a rectangular groove structure: a rectangular groove structure is dug at the upper circuit ground plane of the metallized via; the lower layer of the left arc surface is specifically designed to have a semi-circular groove structure: a semi-circular groove structure is dug at the lower circuit ground plane of the metallized via.

[0014] As a further technical solution, the metallized vias are provided in four parts.

[0015] Compared with metal rod / metallized via structure and button structure, the coupling calibration network of this invention has high stability, small fluctuation and small phase deviation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a metal rod / metallized via structure;

[0017] Figure 2 for Figure 1 Side view;

[0018] Figure 3 A schematic diagram of the structure of a wool button;

[0019] Figure 4 for Figure 3 Side view;

[0020] Figure 5 This is a schematic diagram of the structure after the metallized via is divided into two arc surfaces, left and right.

[0021] Figure 6 for Figure 5 A schematic diagram of the structure of a single metallized via.

[0022] Figure 7 To be Figure 5 A schematic diagram of the structure after slotting the metallized vias;

[0023] Figure 8 for Figure 7 A schematic diagram of the structure of a single metallized via.

[0024] Figure 9 To be Figure 7 A schematic diagram of the structure after the end of the centrally coupled calibration network conforms to the left arc of the metallized via;

[0025] Figure 10 for Figure 9 A schematic diagram of the structure of a single metallized via.

[0026] Figure 11 Stability diagram of the coupled calibration network for the metal rod / metallized via structure;

[0027] Figure 12 Stability diagram of the coupled calibration network for the fuzzy button structure;

[0028] Figure 13 The stability diagram of the coupled calibration network for this structure;

[0029] Figure 14 Phase difference diagram of metal rod / metallized via structure;

[0030] Figure 15 Phase difference diagram of the button structure;

[0031] Figure 16 This is the phase difference diagram for this structure. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] Example

[0034] like Figures 5-10 As shown, this embodiment provides a structure to enhance the coupling stability of a coaxial-fed antenna array coupling calibration network, including a dielectric substrate 1, a coupling calibration network 2, and an antenna 3. The coupling calibration network 2 is disposed inside the dielectric substrate 1. A metallized via 4 is formed on the dielectric substrate 1. The antenna 3 passes through the metallized via 4. The metallized via 4 is divided into a left arc surface 41 and a right arc surface 42. A rectangular groove structure 44 is formed in the upper layer of the left arc surface 41, and a semi-circular annular groove structure 45 is formed in the lower layer of the left arc surface 41. The end of the coupling calibration network conforms to the left arc surface 41.

[0035] In this embodiment, a cuboid 43 with a width of 0.15 mm and the same depth as the metallized via is formed on the dielectric substrate 1. The cuboid 43 divides the metallized via 4 into two arc surfaces, left and right. The cuboid 43 is located at 1 / 4 of the length of the metallized via ring.

[0036] In this embodiment, the upper layer of the left arc surface 41 is specifically designed to form a rectangular groove structure: a rectangular groove structure is formed at the upper circuit ground plane of the metallized via; the lower layer of the left arc surface is specifically designed to form a semi-circular groove structure: a semi-circular groove structure is formed at the lower circuit ground plane of the metallized via.

[0037] In this embodiment, four metallized vias are provided.

[0038] The manufacturing process of this embodiment is as follows:

[0039] 1. For example Figure 5 , Figure 6 As shown, the metallized via 4 in the coaxial power supply structure is first divided into two arc surfaces, left and right. A cuboid with a width of 0.15mm and a metallized via depth is created in the coaxial power supply structure, located at 1 / 4 of the via ring, and then divided into two arc surfaces, left and right.

[0040] 2. For example Figure 7 , Figure 8 As shown, after dividing the metallized via into two arc surfaces, the left arc surface is isolated. The left arc surface is isolated by creating grooves in the upper and lower circuit ground planes of the metallized via: a rectangular groove in the upper layer and a semi-circular groove in the lower layer.

[0041] 3. For example Figure 9 and Figure 10 As shown, the end of the coupling calibration network is conformally fitted to the left arc surface. After the left and right arc surfaces are separated, the left arc surface has two functions: first, it serves as the coupling surface of the coupling calibration network, expanding the cross-sectional coupling area of ​​the stripline calibration network and enhancing the stability of the calibration network; second, it maintains the integrity of the metallized vias of the coaxial feed structure and does not affect the feed performance.

[0042] Through simulation, such as Figures 11-16 As shown, compared with the metal rod / metallized via structure and the button structure, the structure of this embodiment has high stability, small fluctuations, and small phase deviation in the coupling calibration network.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It should be noted that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A structure for enhancing the coupling stability of a coupling calibration network of a coaxial feed antenna array, comprising a dielectric substrate, a coupling calibration network and an antenna, the coupling calibration network being arranged inside the dielectric substrate, a metallized via being formed on the dielectric substrate, and the antenna being arranged in the metallized via, characterized in that, the dielectric substrate is provided with a plurality of metalized vias, and the antenna is arranged in the plurality of metalized vias. The metallized via is divided into two arc surfaces, left and right. A rectangular groove structure is cut into the upper layer of the left arc surface, and a semi-circular annular groove structure is cut into the lower layer of the left arc surface. The end of the coupling calibration network is conformal to the left arc surface. A cuboid with a width of 0.15 mm and the same depth as the metallized via is formed on the dielectric substrate. This cuboid divides the metallized via into two arc surfaces, left and right. Specifically, the rectangular groove structure cut into the upper layer of the left arc surface is a rectangular groove structure cut into the upper circuit ground plane of the metallized via. Specifically, the semi-circular annular groove structure cut into the lower layer of the left arc surface is a semi-circular annular groove structure cut into the lower circuit ground plane of the metallized via.

2. The structure for enhancing the coupling stability of the coaxial-fed antenna array coupling calibration network according to claim 1, characterized in that, The cuboid is located at 1 / 4 of the metallized via ring.

3. The structure for enhancing the coupling stability of the coaxial-fed antenna array coupling calibration network according to claim 1, characterized in that, The metallized vias are provided in four places.

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