A millimeter wave PCB antenna structure

Abstract

The present invention discloses a millimeter-wave PCB antenna structure, comprising a dielectric block, wherein four first-layer radiators are mounted on the upper surface of the dielectric block, an isolation metal body is fixedly connected to the upper surface of the dielectric block, a plurality of antenna grounding metal bodies are fixedly connected to the lower surface of the dielectric block, a plurality of feeding contact points are fixedly connected to the lower surface of the dielectric block, a second-layer radiator is arranged on the lower surface of the first-layer radiator, a third-layer radiator is arranged on the lower surface of the second-layer radiator, a feeding post is arranged on the upper surface of the dielectric block, and a plurality of feeding holes are opened on the upper surface of the dielectric block. In this millimeter-wave PCB antenna structure, the third-layer radiators are connected via coupling and the second-layer radiators are directly connected, and the first-layer radiators and the second-layer radiators are coupled, thereby increasing the high-frequency bandwidth of the antenna. Furthermore, the antenna structure has a simple manufacturing process, can realize a dual-frequency structure in the millimeter-wave band, has dual-polarization radiation characteristic gain, and is highly practical.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a millimeter wave PCB antenna structure. Background Art

[0002] 5G, the fifth generation of mobile communication technology, is a new generation of broadband mobile communication technology with high speed, low latency and large connection characteristics. It is the network infrastructure for realizing the interconnection between man, machine and things. With the increasing popularity of 5G, especially the increasing application of FR2 millimeter wave band, the corresponding demand for 5G millimeter antennas is also increasing.

[0003] For 5G small communication equipment, the antenna size is required to be small enough, the radiation performance is good, and the manufacturing process is required to be simple. However, the existing antennas are difficult to manufacture and it is difficult to achieve the millimeter wave dual-band dual-frequency structure and dual-polarization radiation characteristics, which makes them inconvenient to use. Summary of the Invention

[0004] The object of the present invention is to provide a millimeter wave PCB antenna structure to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following practical technical solutions: a millimeter wave PCB antenna structure, comprising a dielectric block, four first-layer radiators are mounted on the upper surface of the dielectric block, an isolation metal body is fixedly connected to the upper surface of the dielectric block, a plurality of antenna grounding metal bodies are fixedly connected to the lower surface of the dielectric block, a plurality of feeding contact points are fixedly connected to the lower surface of the dielectric block, a second-layer radiator is arranged on the lower surface of the first-layer radiator, a third-layer radiator is arranged on the lower surface of the second-layer radiator, a feeding post is provided on the upper surface of the dielectric block, a plurality of feeding holes are opened on the upper surface of the dielectric block, a reflecting ground layer is fixedly connected to the lower surface of the reflecting ground layer, and four via holes are opened on the lower surface of the reflecting ground layer.

[0006] Preferably, the feeding contact point is electrically connected to the feeding system.

[0007] Preferably, the feeding hole electrically connects the second layer radiator to the feeding contact point.

[0008] Preferably, the third layer of radiators is coupled to the second layer of radiators and is coupled to the feeding holes via a certain gap, and the second layer of radiators is connected to the feeding holes.

[0009] Preferably, the feeding post directly connects the isolation metal body and the antenna grounding metal body.

[0010] Preferably, the antenna grounding metal body is electrically connected to the reflective stratum through a via. Beneficial effects

[0011] The present invention provides a millimeter wave PCB antenna structure, which has the following beneficial effects:

[0012] 1. This millimeter-wave PCB antenna structure uses via-hole coupling to connect the third-layer radiator and directly connect to the second-layer radiator. The first and second radiators are coupled, increasing the antenna's high-frequency bandwidth. This antenna structure also features a simple manufacturing process, enabling dual-band operation in the millimeter-wave band. It exhibits dual-polarization radiation characteristics and gain, making it highly practical.

[0013] 2. In this millimeter-wave PCB antenna structure, the antenna ground metal body serves as the contact point between the ground and the system ground. Connected to the reflective ground layer through four vias, this ensures optimal contact between the antenna and the system, optimizing antenna performance and enhancing ease of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the internal front view structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of the present invention when viewed from above;

[0017] Figure 4 This is a schematic diagram of the top view of the second layer antenna radiator of the present invention;

[0018] Figure 5 This is a schematic diagram of the top view of the third layer antenna radiator of the present invention;

[0019] Figure 6 This is a schematic diagram of the reflective stratum structure from a top view according to the present invention;

[0020] Figure 7 This is a schematic diagram of the structure of the feed point, location and system contact point of the present invention;

[0021] Figure 8 A return loss diagram of one of the antenna ports of the present invention;

[0022] Figure 9 is an efficiency diagram of one of the antenna ports of the present invention;

[0023] Figure 10 This is a gain diagram of one of the antenna ports of the present invention.

[0024] In the figure: 1. Dielectric block, 2. First layer radiator, 3. Isolation metal body, 4. Antenna grounding metal body, 5. Feeding contact point, 6. Second layer radiator, 7. Third layer radiator, 8. Grounding column, 9. Feeding hole, 10. Reflection layer, 11. Via hole. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] See also Figure 1-10 The present invention provides a technical solution: a millimeter wave PCB antenna structure, including a dielectric block 1, four first-layer radiators 2 are installed on the upper surface of the dielectric block 1, an isolation metal body 3 is fixedly connected to the upper surface of the dielectric block 1, a plurality of antenna grounding metal bodies 4 are fixedly connected to the lower surface of the dielectric block 1, a plurality of feeding contact points 5 are fixedly connected to the lower surface of the dielectric block 1, the feeding contact points 5 are electrically connected to the feeding system, a second-layer radiator 6 is provided on the lower surface of the first-layer radiator 2, a third-layer radiator 7 is provided on the lower surface of the second-layer radiator 6, the third-layer radiator 7 is coupled with the second-layer radiator 6, a certain distance is maintained between the first-layer radiator 2 and the second-layer radiator 6, as well as between the second-layer radiator 6 and the third-layer radiator 7, and they are not directly connected, and the radiators are filled with dielectric.

[0027] The top surface of the dielectric block is provided with a grounding post 8, which directly connects the isolation metal body 3 to the antenna grounding metal body 4. Several feed holes 9 are provided on the top surface of the dielectric block 1. The third-layer radiator 7 is coupled to the feed holes 9 via a certain gap, and the second-layer radiator 6 is connected to the feed holes 9. The feed holes 9 electrically connect the second-layer radiator 6 to the feed contact point 5. The third-layer radiator 7 is coupled to the feed and the second-layer radiator 6, generating the antenna's first resonance. The second-layer radiator 6 is directly connected to the feed, generating the antenna's second resonance. The coupling between the first-layer radiator 2 and the second-layer radiator 6 increases the bandwidth of the second resonance.

[0028] The lower surface of the dielectric block 1 is fixedly connected to a reflective layer 10 . Four groups of via holes 11 are opened on the lower surface of the reflective layer 10 . The antenna grounding metal body 4 is electrically connected to the reflective layer 10 through the via holes 11 .

[0029] In the figure, 201, 202, 203, and 204 are all first-layer radiators, 301 and 302 are isolated metal bodies, 401, 402, 403, 404, 405, 406, and 407 are all antenna grounding metal bodies, 501, 502, 511, 512, 521, 522, 531, and 532 are all feeding contact points, 601, 602, 603, and 604 are all second-layer radiators, 701, 702, 703, and 704 are all third-layer radiators, 801, 802, 811, and 812 are all grounding posts, 901, 902, 911, 912, 921, 922, 931, and 932 are all feeding holes, and 111, 112, 113, and 114 are all vias.

[0030] Figure 8 , 9, 10 are experimental data parameters measured by the test line from the feeding point 501. The other feeding contact points 502, 511, 512, 521, 522, 531, 532 can also test the data with the same trend, which will not be repeated here. Figure 8 The return loss graph shows that the horizontal axis is frequency in GHz and the vertical axis is return loss value in dB. The graph shows that this structure can generate two resonances at the same time, and the operating frequency band can be 27.5GHz to 28.35GHz and 37GHz to 40GHz, realizing dual-band transmission of millimeter wave high and low frequencies. Figure 9 Antenna efficiency diagram, the horizontal axis is frequency, the unit is GHz, the vertical axis efficiency unit is dB. In the working frequency band, the efficiency can achieve -2dB performance, which is relatively good. Figure 10 In the figure, the circumferential value is the angle, and the chordal value is decibel (dB). The figure shows that the gain of a single antenna can reach 4dBi, which can meet the application requirements.

[0031] Working principle: The first layer radiator 2 is coupled with the second layer radiator 6, and the feeding hole 9 is coupled to connect the third layer radiator 7 and directly connected to the second layer radiator 6, which can increase the high-frequency bandwidth of the antenna. The manufacturing process of the antenna structure is simple, and it can realize the dual-frequency structure of the millimeter wave band, with dual-polarization radiation characteristic gain. The antenna grounding metal body 4 is the contact point between the ground and the system ground. It is connected to the reflective ground layer 10 through four groups of vias 11, which can make the antenna as good as possible in contact with the system, thereby optimizing the performance of the antenna and making it more convenient to use.

[0032] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A millimeter wave PCB antenna structure, comprising a dielectric block (1), characterized in that: The upper surface of the dielectric block (1) is provided with four first-layer radiators (2), the upper surface of the dielectric block (1) is fixedly connected with an isolation metal body (3), the lower surface of the dielectric block (1) is fixedly connected with a plurality of antenna grounding metal bodies (4), the lower surface of the dielectric block (1) is fixedly connected with a plurality of feeding contact points (5), the lower surface of the first-layer radiator (2) is provided with a second-layer radiator (6), the lower surface of the second-layer radiator (6) is provided with a third-layer radiator (7), the upper surface of the dielectric block is provided with a grounding column (8), the upper surface of the dielectric block (1) is provided with a plurality of feeding holes (9), the lower surface of the dielectric block (1) is fixedly connected with a reflection stratum (10), the lower surface of the reflection stratum (10) is provided with four via holes (11), the antenna grounding metal body (4) is connected to the reflection stratum (10) through the via holes (11). ) are electrically connected, the third layer radiator (7) is coupled with the second layer radiator (6), the third layer radiator (7) is coupled with the feeding hole (9) through a certain gap, the second layer radiator (6) is connected with the feeding hole (9), the feeding hole (9) electrically connects the second layer radiator (6) with the feeding contact point (5), the third layer radiator (7) is coupled with the feeding and the second layer radiator (6), generating the first resonance of the antenna, the second layer radiator (6) is directly connected with the feeding, generating the second resonance of the antenna, the third layer radiator (7) is coupled with the second layer radiator (6), increasing the bandwidth of the second resonance, there is a certain distance between the first layer radiator (2) and the second layer radiator (6) and the second layer radiator (6) and the third layer radiator (7), not directly connected, and each radiator is filled with a medium; The feed contact point (5) is arranged between the antenna grounding metal body (4); The isolation metal body (3) is arranged between the first layer of radiators (2); The grounding column (8) directly connects the isolation metal body (3) and the antenna grounding metal body (4).

2. The millimeter wave PCB antenna structure according to claim 1, wherein: The feed contact point (5) is electrically connected to the feed system.

3. The millimeter wave PCB antenna structure according to claim 1, characterized in that: The antenna grounding metal body (4) is electrically connected to the reflective ground layer (10) through a via hole (11).

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