Double-sided PCB antenna applied to multiple frequency bands

Abstract

The utility model discloses a double-sided PCB antenna applied to multiple frequency bands, which comprises a dielectric substrate, a medium-high frequency radiation part and a low frequency radiation part which are arranged up and down and connected with each other are arranged on the front surface of the dielectric substrate, and a grounding part is arranged between the medium-high frequency radiation part and the low frequency radiation part. The medium-high-frequency radiation part comprises a vertical high-frequency radiation arm and a bent medium-frequency radiation arm which are arranged left and right and connected, the medium-frequency radiation arm is provided with a feeding point, and two sides of the medium-frequency radiation arm are provided with a first abdicating space and a second abdicating space; a first inductive coupling piece and a second inductive coupling piece are arranged on the back face, opposite to the first receding space and the second receding space, of the dielectric substrate. The antenna radiation resistance is adjusted by arranging the inductive coupling radiation sheets at different positions, controlling the width of the gap and the dislocation area of the lap joint space and controlling the width and length of the tail end oscillator, the working efficiency of the antenna is improved, and the size required by the antenna is reduced.

Description

Technical Field

[0001] This utility model relates to the field of antenna technology, and in particular to a double-sided PCB antenna for multi-band applications. Background Technology

[0002] Currently, most PCB copper-plated mushroom-shaped antennas on the market are single-function GPS / WiFi / BT antennas. Compatibility with more frequency bands will lead to a decrease in antenna efficiency. Similar to ceramic GPS antennas, which have good working performance but a very narrow operating frequency band, with the key operating frequency being 1575.42±1MHz, PCB board assembled bracket / steel sheet antennas have multiple antennas inside to form a multi-frequency band operation. The isolation between antennas needs to be considered. The demand for IoT devices in the mainstream market is moving towards miniaturization and precision. Therefore, it is necessary to design practical miniaturized antennas that can accommodate multiple frequency bands for device matching. Utility Model Content

[0003] To achieve the above objectives, the technical solution adopted by this utility model is: a double-sided PCB antenna for multi-band applications, comprising: a dielectric substrate, a mid-to-high frequency radiating part and a low-frequency radiating part arranged vertically and connected on the front side of the dielectric substrate, a grounding part between the mid-to-high frequency radiating part and the low-frequency radiating part, the mid-to-high frequency radiating part comprising a vertical high-frequency radiating arm arranged horizontally and connected to the front and a bent mid-frequency radiating arm, a feed point provided on the mid-frequency radiating arm, a first clearance space and a second clearance space provided on both sides of the mid-frequency radiating arm, and a first inductive coupling plate and a second inductive coupling plate provided on the back side of the dielectric substrate opposite to the first clearance space and the second clearance space.

[0004] Furthermore, a tuned radiating section is provided between the mid-to-high frequency radiating section and the low frequency radiating section. The tuned radiating section is "H" shaped. The lower right end of the tuned radiating section is connected to the mid-to-high frequency radiating section and the low frequency radiating section. A second clearance space is formed between the tuned radiating section and the mid-frequency radiating arm. A second inductive coupling plate is provided on the back side of the dielectric substrate opposite to the second clearance space. The second inductive coupling plate is complementary to the mid-frequency radiating arm and the tuned radiating section in a misaligned gap.

[0005] Furthermore, the upper left end of the branch of the tuning radiation section is at a 45° bevel angle.

[0006] Furthermore, the high-frequency radiating arm and the mid-frequency radiating arm are in the shape of an inverted "G", and the low-frequency radiating part is in the shape of an "L".

[0007] Furthermore, the distance between the left side of the low-frequency radiating part and the high-frequency radiating arm is 0.8 mm.

[0008] Furthermore, the front side of the dielectric substrate is provided with a first central coupling plate, which is disposed within the generally U-shaped structure formed by the lower end of the tuned radiating part and the low-frequency radiating part. A first gap is provided between the first central coupling plate and the tuned radiating part, and a second central coupling plate is provided on the back side at the position corresponding to the first gap.

[0009] Furthermore, the first and second central coupling plates are approximately rectangular. When the front and back projections are projected onto the same plane, the right edge of the second central coupling plate is 0.8 mm away from the tuning radiator.

[0010] Furthermore, the back side of the dielectric substrate is also provided with a near-ground gap misalignment coupling sheet, a second gap is provided between the upper part of the low-frequency radiating part and the grounding part, and a near-ground gap misalignment coupling sheet is provided on the back side at the position corresponding to the second gap.

[0011] Furthermore, a first edge coupling portion is provided below the high-frequency radiation arm of the mid-to-high frequency radiation portion, and a second edge coupling portion is provided on the back side corresponding to the first edge coupling portion. At least one metal via is provided on the first edge coupling portion and the second edge coupling portion, and the two are connected through the metal via.

[0012] Furthermore, a near-feed slot-overlapping knife-shaped radiating plate is provided above the mid-to-high frequency radiating section, and a first gap is provided between the near-feed slot-overlapping knife-shaped radiating plate and the mid-to-high frequency radiating section, the width of the first gap being 0.2mm.

[0013] The beneficial effects of this utility model are as follows: The overall radiating element of the antenna designed in this embodiment is composed of three forms: an inverted mirror "G"-shaped mid-to-high frequency radiating part, a quasi-periodic misaligned slot complementary inductive coupling plate, and an "L"-shaped low frequency radiating arm. By arranging the inductive coupling radiating plates at different positions, controlling the width of the slots, the area of ​​the overlapping space misalignment, and controlling the width and length of the end vibrator, the antenna radiation resistance can be adjusted, thereby improving the antenna's working efficiency and reducing the required antenna size. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the front structure of the double-sided PCB antenna in an embodiment of this utility model;

[0015] Figure 2 This is a schematic diagram of the back structure of the double-sided PCB antenna in an embodiment of this utility model;

[0016] Figure 3 This is an antenna efficiency diagram in an embodiment of the present invention;

[0017] Figure 4 This is an antenna gain diagram in an embodiment of the present invention;

[0018] Reference numerals: 1-Dielectric substrate, 2-Feed point, 3-Ground part, 4-Mid-high frequency radiating part, 40-High frequency radiating arm, 41-Mid frequency radiating arm, 50-First inductive coupling plate, 51-Second inductive coupling plate, 6-First center coupling plate, 7-Second center coupling plate, 8-Low frequency radiating part, 9-Second edge coupling part, 10-First edge coupling part, 11-Near-ground slot misaligned coupling plate, 12-Tune radiating part, 13-Near-feed slot overlapping knife-shaped radiating plate, 14-First gap, 15-Second gap, 16-First gap, 17-Second clearance space, 18-First clearance space, 101-Metal via Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0020] This application provides a bifacial PCB antenna applicable to multiple frequency bands, solving the problems of large antenna size and low efficiency in the prior art. In this embodiment, the mid-to-high frequency radiating part is located on the upper side, upper end, or upper edge of the dielectric substrate relative to the low frequency radiating part, and the opposite direction is defined as lower, lower side, lower end, or lower edge. The high frequency radiating arm is located on the left, left side, left end, or left side of the dielectric substrate relative to the mid-frequency radiating arm, and the opposite direction is defined as right, right side, right end, or right side.

[0021] like Figures 1-2 The following is an embodiment of this application:

[0022] A double-sided PCB antenna for multi-band applications includes: a dielectric substrate 1. In this embodiment, the dielectric substrate 1 is made of FR4 material. Antennas designed and manufactured on this substrate can greatly reduce burrs and short circuits in the vibrator circuit and also have certain anti-static advantages.

[0023] The front side of the dielectric substrate 1 is provided with a mid-to-high frequency radiating part 4 and a low-frequency radiating part 8 arranged vertically and connected to each other. The mid-to-high frequency radiating part 4 includes a vertical high-frequency radiating arm 40 arranged horizontally and connected to each other and a bent mid-frequency radiating arm 41. A grounding part 3 is provided between the mid-frequency radiating arm 41 and the low-frequency radiating part 8. The grounding part 3 is soldered at this location for connection with the braided layer of the RF coaxial cable. In this design, it serves to fix the welding direction of the cable. A feed point 2 is provided in the middle of the mid-frequency radiating arm 41. The feed point 2 is the connection point between the antenna working circuit and the RF module of the entire device.

[0024] The high-frequency radiating arm 40 and the intermediate-frequency radiating arm 41 are inverted "G" shape. The parabolic network structure in the inverted "G" shape avoids signal reflection caused by conventional acute angles, reduces impedance abrupt changes in this section of the radiator, and improves the antenna's bandwidth and resonance depth. The feed is introduced into the radiating element from above the center of the mid-to-high frequency radiating part 4 in the inverted "G" shape. This part is the main contributor to the antenna's intermediate and high frequencies of 2300-7125MHz. The distance between the feed point 2 and the ground part 3, as well as the length and width of the two radiating arms, affect the low-frequency bandwidth of 1560-1610MHz. When the distance between the feed point 2 and the ground part 3 is adjusted to 2mm, the low-frequency bandwidth reaches the critical point.

[0025] The intermediate frequency radiating arm 41 has a first clearance space 18 and a second clearance space 17 on both sides. The back side of the dielectric substrate 1 opposite to the first clearance space 18 and the second clearance space 17 is provided with a first inductive coupling plate 50 and a second inductive coupling plate 51. The first clearance space 18 is the space formed from the upper right end of the intermediate frequency radiating arm to the edge of the dielectric substrate. A tuning radiating part 12 is provided between the intermediate frequency radiating part 4 and the low frequency radiating part 8. The tuning radiating part 12 is "H" shaped. The lower right end of the tuning radiating part 12 is connected to the intermediate frequency radiating part 4 and the low frequency radiating part 8. The second clearance space 17 is formed between the tuning radiating part 12 and the intermediate frequency radiating arm 41. The back side of the dielectric substrate 1 opposite to the second clearance space 17 is provided with a second inductive coupling plate 51. The second inductive coupling plate 51 is complementary to the intermediate frequency radiating arm 41 and the tuning radiating part 12 with a misaligned gap.

[0026] The first inductive coupling plate 50 and the second inductive coupling plate 51 are two arc-shaped plates with their back surfaces that complement the gaps between the mid-to-high frequency radiating section 4 and the tuning radiating section 12. They are constructed with only 0.76mm of wiring, amplifying the signal radiation area in the mid-to-high frequency range, especially eliminating clutter in the 5150-5850 MHz range, thus providing the 5G WiFi section with a certain degree of anti-interference capability. By using two arc-shaped, periodic, misaligned, complementary inductive coupling plates, the surface current of the antenna at that location is changed, increasing the radiation efficiency of the mid-to-high frequency section and enhancing stability.

[0027] The upper left end of the branch of the tuning radiator 12 is beveled, preferably at 45°. The beveled angle at the end of the tuning radiator 12 changes the surface current of that part. When the bevel is 45°, it works together with the mid-to-high frequency radiator 4 to influence the mid-frequency resonance of 2400-2500MHz, shifting the 2.5GHz point to the deepest resonance position and improving the radiation efficiency at that point.

[0028] A first central coupling plate 6 is also provided on the front side of the dielectric substrate 1. The first central coupling plate 6 is disposed within the approximately U-shaped line formed by the low-frequency radiating part 8 and the tuning radiating part 12. A first gap 14 is provided between the first central coupling plate 6 and the tuning radiating part 8. A second central coupling plate 7 is provided on the back side corresponding to the position of the first gap 14. The first central coupling plate 6 and the second central coupling plate 7 are approximately rectangular. When the front and back sides are projected onto the same plane, the right edge of the second central coupling plate 7 is 0.8 mm away from the tuning radiating part 12. The combination of the two double-sided radiating plates, with a 0.8 mm misalignment at the non-plane misalignment and overlap position of the second central coupling plate 7 and the tuning radiating part 12, optimizes the resonance depth of the antenna in the low-frequency 1560-1610 MHz range.

[0029] The low-frequency radiating section 8 is L-shaped. This section is the end of the low-frequency radiating oscillator. Its current and the low-frequency stub at the lower right end of the tuned radiating section 12 combine to form a circuit structure surrounding the first central coupling plate 6. The low-frequency radiating section 8 is 0.8mm away from the high-frequency radiating arm 40 on the left side of the mid-high frequency radiating section 4. The magnetic fields generated by the currents of the two interact with each other, making the low-frequency 1560-1610MHz band smooth, and reaching the deepest resonance point at 1560MHz.

[0030] A near-ground slot misalignment coupling plate 11 is also provided on the back side of the dielectric substrate 1. A second gap 15 is provided between the low-frequency radiating part 8 and the grounding part 3. The near-ground slot misalignment coupling plate 11 is provided on the back side corresponding to the second gap 15. The near-ground slot misalignment coupling plate 11 adopts a misaligned slot coupling method, which extends the grounding part 3 and plays the role of extending the ground. The ground and the feed form an indirect connection. The near-ground slot misalignment coupling plate 11 and the grounding part 3 are combined with the low-frequency radiating part 8 in a misaligned arrangement, which has a significant impact on the resonant bandwidth of the entire frequency band. When projected from the front to the back onto the same plane, when the near-ground slot misalignment coupling plate 11 is misaligned to the right by 2.3mm relative to the low-frequency radiating part 8, the resonance and bandwidth are increased, and the anti-interference capability of the entire feed network is improved, which meets the expected effect. By using a double-sided near-ground misalignment induction plate to spatially misalign the end of the vibrator with the feed point, the magnetic field strength of the antenna at the output position and the end is changed, eliminating most of the in-band clutter and improving stability.

[0031] Below the high-frequency radiating arm 40 of the mid-to-high frequency radiating section 4, a first edge coupling section 10 is provided. On the back side corresponding to the first edge coupling section 10, a second edge coupling section 9 is provided. The first edge coupling section 10 and the second edge coupling section 9 are provided with at least one metal via 101, and the two are connected through the metal via 101. This increases the area of ​​the inductive coupling plate in a limited area. At the same time, the end of the high-frequency radiating arm 40 and its branches are close to each other, which increases the bandwidth of the high-frequency 5925-7125MHz part. The standing wave ratio (VSWR) in the 7125-8000MHz frequency band is also below 2.0.

[0032] Above the mid-to-high frequency radiating section 4, there is also a near-feed gap overlapping knife-shaped radiating plate 13. There is a first gap 16 between the near-feed gap overlapping knife-shaped radiating plate 13 and the mid-to-high frequency radiating section 4. The connection between this point and the mid-to-high frequency radiating section 4 has a greater impact on the entire frequency band. The smaller the gap, the higher the overall working efficiency. The width of the first gap 16 is set to 0.2mm (which does not exceed the maximum tolerance range of the PCB copper pouring circuit).

[0033] In summary, the overall antenna radiating element in this embodiment consists of three forms: a mirror-image "G"-shaped mid-to-high frequency radiating section 4, a type-periodic misaligned periodic radiating section, a slotted complementary inductive coupling plate, and an "L"-shaped low-frequency radiating section 8. By arranging the inductive coupling radiating plates at different positions, controlling the width of the slots, the area of ​​the overlapping space misalignment, and controlling the width and length of the end element, the antenna radiation resistance can be adjusted, thereby improving the antenna's working efficiency and reducing the required antenna size.

[0034] like Figures 3-4 The antenna performance in this embodiment achieves the following technical targets: average efficiency of 48% and peak gain of 2.54dBi in the 1560-1610 MHz range; average efficiency of 52% and peak gain of 2.69dBi in the 2300-2690 MHz range; average efficiency of 50% and peak gain of 5.02dBi in the 3300-6000 MHz range; average efficiency of 53% and peak gain of 5.51dBi in the 5150-5850 MHz range; and VSWR: below 2.0 in the 1560-1610 MHz / 2400-2497 MHz / 5150-5850 MHz / 5925-7125 MHz range, and below 3.0 in the 2300-2690 MHz / 3300-6000 MHz range.

[0035] In summary, the dual-sided PCB antenna applied to multiple frequency bands in this embodiment has a smaller clearance ratio. The overall diameter of the antenna PCB is 41.9mm, the board thickness is 0.76mm, the surface copper line thickness is 0.035mm, and the solder pad power supply method uses most conventional coaxial transmission cables on the market, which is convenient for mass production assembly on the production line.

[0036] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A dual-sided PCB antenna applied to multi-band, characterized in that, The medium substrate is provided with a high-middle frequency radiation part and a low frequency radiation part arranged in up-down and connected on the front surface of the medium substrate, a grounding part is arranged between the high-middle frequency radiation part and the low frequency radiation part, the high-middle frequency radiation part comprises vertical high frequency radiation arms and bent middle frequency radiation arms arranged in left-right and connected, a feeding point is arranged on the middle frequency radiation arm, and the high-middle frequency radiation part is provided with a first space and a second space on both sides of the middle frequency radiation arm. A tuning radiation part is arranged between the high-middle frequency radiation part and the low frequency radiation part, the tuning radiation part is in "H" shape, the lower right end of the tuning radiation part is connected with the high-middle frequency radiation part and the low frequency radiation part, the second space is formed between the tuning radiation part and the middle frequency radiation arm, the back surface of the medium substrate opposite to the second space is provided with a second inductive coupling sheet, and the second inductive coupling sheet is complementary to the middle frequency radiation arm and the tuning radiation part in different planes.

2. The dual-sided PCB antenna for multi-band use according to claim 1, wherein: The upper left end of the tuning radiation part is a bevel angle, and the bevel angle is 45°.

3. The dual-sided PCB antenna for multi-band use according to claim 2, wherein: The high frequency radiation arm and the middle frequency radiation arm are in inverted mirror "G" shape, and the low frequency radiation part is in "L" shape.

4. The dual-sided PCB antenna for multi-band use according to claim 1, wherein: The distance between the left side of the low frequency radiation part and the high frequency radiation arm is 0.8mm.

5. The dual-sided PCB antenna for multi-band use according to claim 1, wherein: The front surface of the medium substrate is further provided with a first central coupling sheet, the first central coupling sheet is arranged in the approximately U-shaped structure formed by the lower end of the tuning radiation part and the low frequency radiation part, a first gap is arranged between the first central coupling sheet and the tuning radiation part, and a second central coupling sheet is arranged on the back surface opposite to the first gap.

6. The dual-sided PCB antenna for multi-band use according to claim 2, wherein: The first central coupling sheet and the second central coupling sheet are approximately rectangular, and when the front surface is projected to the back surface in the same plane, the right side edge of the second central coupling sheet is 0.8mm away from the tuning radiation part.

7. The dual-sided PCB antenna for multi-band use according to claim 6, wherein: The back surface of the medium substrate is further provided with a near-ground gap staggered coupling sheet, a second gap is arranged between the upper side of the low frequency radiation part and the grounding part, and the near-ground gap staggered coupling sheet is arranged on the back surface opposite to the second gap.

8. The dual-sided PCB antenna for multi-band application according to claim 1, wherein: The lower side of the high frequency radiation arm of the high-middle frequency radiation part is further provided with a first edge coupling part, the back surface corresponding to the first edge coupling part is provided with a second edge coupling part, at least one metal via is arranged on the first edge coupling part and the second edge coupling part, and the first edge coupling part and the second edge coupling part are connected through the metal via.

9. The dual-sided PCB antenna for multi-band application according to claim 1, wherein: The upper side of the high-middle frequency radiation part is further provided with a near-feeding gap overlapping knife-type radiation sheet, a first gap is arranged between the near-feeding gap overlapping knife-type radiation sheet and the high-middle frequency radiation part, and the width of the first gap is 0.2mm.

10. The dual-sided PCB antenna for multi-band use according to claim 1, wherein: ​

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