A dipole antenna with parasitic structures for enhanced isolation

Abstract

This invention relates to the fields of antenna technology and wireless communication technology, and discloses a dipole antenna with a parasitic structure for enhanced isolation. The antenna includes a dielectric substrate, a first BLE antenna, a second BLE antenna, and a parasitic structure. The parasitic structure is disposed on the dielectric substrate and located at the center of the substrate. The first and second BLE antennas have identical structures and are symmetrically arranged on opposite sides of the dielectric substrate with respect to the parasitic structure. A half-wavelength interval is placed between the first and second BLE antennas. In this invention, the first and second BLE antennas have identical structures and are symmetrically arranged to ensure consistent radiation performance. By placing a parasitic structure between the first and second BLE antennas, the electromagnetic coupling between the two antennas is weakened, enhancing isolation. Simultaneously, the electromagnetic field distribution around the antennas is optimized, avoiding radiation pattern distortion.

Description

Technical Field

[0001] This invention relates to the fields of antenna technology and wireless communication technology, specifically to a dipole antenna with a parasitic structure for enhancing isolation. Background Technology

[0002] With the explosive growth in demand for smart cars and vehicle connectivity, Bluetooth Low Energy (BLE) technology has become the core solution for in-vehicle short-range low-power communication. It is widely used in scenarios such as keyless entry, in-vehicle sensing, driver recognition, and wireless diagnostics, directly affecting vehicle connectivity and user experience.

[0003] The Zynq UltraScale+ (ZCU) platform provides a flexible architecture for BLE function integration, supporting connectivity via external or embedded BLE transceivers. It can expand advanced automotive functions such as BLE ranging, positioning and tracking, and data exchange. At the same time, this type of BLE antenna can also be adapted to other hardware platforms.

[0004] In automotive scenarios, BLE antennas are often arranged in pairs for ranging and positioning tracking. However, existing dipole antennas lack a dedicated isolation structure when BLE antennas are arranged in pairs. This results in severe electromagnetic coupling between the two BLE antennas due to electromagnetic interference from adjacent antennas. The interference from adjacent antennas causes significant signal crosstalk, disrupts the omnidirectional radiation characteristics, and severely attenuates the signal strength in some directions. This directly affects ranging accuracy and positioning accuracy, making it unable to meet the requirements for stable multi-directional communication in automotive scenarios. Summary of the Invention

[0005] To address the problems in the prior art where dipole antennas, when arranged in pairs with BLE antennas, lack an isolation structure and are affected by electromagnetic interference from adjacent BLE antennas, resulting in severe electromagnetic coupling and significant signal crosstalk, directly impacting ranging and positioning accuracy, this invention provides a dipole antenna with a parasitic structure to enhance isolation.

[0006] This invention provides a dipole antenna with a parasitic structure for enhanced isolation, comprising: a dielectric substrate, a first BLE antenna, a second BLE antenna, and a parasitic structure. The parasitic structure is disposed on the dielectric substrate and located in the middle of the dielectric substrate. The first BLE antenna and the second BLE antenna have the same structure and are symmetrically disposed on opposite sides of the dielectric substrate with respect to the parasitic structure. The first BLE antenna and the second BLE antenna are spaced apart by half a wavelength.

[0007] In some alternative implementations, the first BLE antenna includes a first radiating stub and a second radiating stub, the first radiating stub and the second radiating stub are arranged in a vertical direction, and the opposite ends of the first radiating stub and the second radiating stub are connected by a first feed line. And / or, the second BLE antenna includes a third radiating stub and a fourth radiating stub, the third radiating stub and the fourth radiating stub being arranged in a vertical direction, and the opposite ends of the third radiating stub and the fourth radiating stub being connected by a second feed line.

[0008] In some optional implementations, the parasitic structure includes a first metal strip, a second metal strip, and a third metal strip. The first and second metal strips are arranged parallel to each other in a horizontal direction, and the third metal strip is arranged vertically between the first and second metal strips. The two ends of the third metal strip are respectively connected to the first and second metal strips. The third metal strip, the first metal strip, and the second metal strip form two U-shaped structures. The opening direction of the U-shaped structure is the same as the feed direction of the first or second BLE antenna.

[0009] In some alternative implementations, the two ends of the first metal strip are bent toward the direction of the second metal strip, and the two ends of the second metal strip are bent toward the direction of the first metal strip.

[0010] In some alternative implementations, the first BLE antenna and the second BLE antenna have opposite radiation directions, and the parasitic structure is perpendicular to the radiation directions of the first BLE antenna and the second BLE antenna. The first feed line of the first BLE antenna extends from the side of the first BLE antenna away from the second BLE antenna, and the second feed line of the second BLE antenna extends from the side of the second BLE antenna away from the first BLE antenna.

[0011] In some alternative implementations, the first radiating stub includes a first metal segment extending horizontally from the feed point of the first feed line toward the direction of the second BLE antenna, a second metal segment extending vertically upward along the end of the first metal segment, and a third metal segment extending horizontally along the end of the second metal segment toward the direction away from the second BLE antenna. The second radiating stub includes a fourth metal segment arranged parallel to the first metal segment, a fifth metal segment extending vertically downward along the end of the fourth metal segment, and a sixth metal segment extending horizontally along the end of the fifth metal segment in a direction away from the second BLE antenna. The fifth metal segment and the second metal segment are located on the same straight line. The end of the fourth metal segment away from the second BLE antenna extends into the direction of the first radiating stub, and the seventh metal segment extends to the feed point of the first feed line. And / or, the third radiating stub includes an eighth metal segment extending horizontally from the feed point of the second feed line toward the direction of the first BLE antenna, a ninth metal segment extending vertically upward along the end of the eighth metal segment, and a tenth metal segment extending horizontally along the end of the ninth metal segment toward the direction away from the first BLE antenna. The fourth radiating stub includes an eleventh metal segment parallel to the eighth metal segment, a twelfth metal segment extending vertically downward from the end of the eleventh metal segment, and a thirteenth metal segment extending horizontally from the end of the twelfth metal segment away from the first BLE antenna. The ninth metal segment and the twelfth metal segment are on the same straight line. The end of the eighth metal segment away from the first BLE antenna extends into the direction of the third radiating stub, forming a fourteenth metal segment that extends to the feed point of the second feed line.

[0012] In some alternative implementations, the first BLE antenna and the second BLE antenna have the same radiation direction, and the parasitic structure is arranged parallel to the radiation direction of the first BLE antenna and the second BLE antenna. The first feed line of the first BLE antenna extends from the side of the first BLE antenna opposite to the second BLE antenna, and the second feed line of the second BLE antenna extends from the side of the second BLE antenna opposite to the first BLE antenna. The opposite ends of the first feed line and the second feed line are connected.

[0013] In some alternative implementations, the first radiating stub includes a first metal segment extending horizontally from the feed point of the first feed line toward the direction away from the second BLE antenna, a second metal segment extending vertically upward along the end of the first metal segment, and a third metal segment extending horizontally along the end of the second metal segment toward the direction of the second BLE antenna. The second radiating stub includes a fourth metal segment arranged parallel to the first metal segment, a fifth metal segment extending vertically downward along the end of the fourth metal segment, and a sixth metal segment extending horizontally along the end of the fifth metal segment toward the direction of the second BLE antenna. The fifth metal segment and the second metal segment are located on the same straight line. The end of the fourth metal segment opposite to the second BLE antenna extends into a seventh metal segment toward the direction of the first radiating stub. The seventh metal segment extends to the feed point of the first feed line. And / or, the third radiating stub includes an eighth metal segment extending horizontally from the feed point of the second feed line toward the direction of the first BLE antenna, a ninth metal segment extending vertically upward along the end of the eighth metal segment, and a tenth metal segment extending horizontally along the end of the ninth metal segment toward the direction away from the first BLE antenna. The fourth radiating stub includes an eleventh metal segment parallel to the eighth metal segment, a twelfth metal segment extending vertically downward from the end of the eleventh metal segment, and a thirteenth metal segment extending horizontally from the end of the twelfth metal segment toward the direction of the first BLE antenna. The ninth metal segment and the twelfth metal segment are located on the same straight line. The fourteenth metal segment extends from the opposite end of the eighth metal segment toward the direction of the third radiating stub toward the first BLE antenna. The fourteenth metal segment extends to the feed point of the second feed line.

[0014] In some alternative implementations, the first feeder and the second feeder are coaxial cables or SMA connectors.

[0015] In some alternative implementations, the dielectric substrate is a single-layer dielectric substrate, and the first BLE antenna, the second BLE antenna, and the parasitic structure are printed on the dielectric substrate.

[0016] Compared with the prior art, the present invention has the following advantages: This invention provides a dipole antenna with a parasitic structure for enhanced isolation. The first BLE antenna and the second BLE antenna are identical in structure and symmetrically arranged to ensure consistent radiation performance. By setting a parasitic structure between the first BLE antenna and the second BLE antenna, the electromagnetic coupling between them is weakened, thereby enhancing the isolation between them. At the same time, the electromagnetic field distribution around the first BLE antenna and the second BLE antenna is optimized to avoid radiation pattern distortion.

[0017] The present invention provides a dipole antenna with a parasitic structure for enhancing isolation. By setting the parasitic structure between the first BLE antenna and the second BLE antenna, the isolation can be enhanced without changing the structural parameters of the dipole antenna itself, without sacrificing the basic performance of the dipole antenna. It has strong compatibility and is easy to mass-produce.

[0018] The above description is merely an overview of the technical solutions of the embodiments of the present invention. In order to better understand the technical means of the embodiments of the present invention and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0019] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of a dipole antenna with a parasitic structure for enhancing isolation, provided by an embodiment of the present invention, is shown.

[0020] Figure 2 A schematic diagram of the structure of a first BLE antenna with a parasitic structure for enhancing isolation, provided by an embodiment of the present invention, is shown.

[0021] Figure 3 A schematic diagram of the structure of a second BLE antenna with a parasitic structure for enhancing isolation, provided by an embodiment of the present invention, is shown.

[0022] Figure 4 The diagram illustrates a comparison of S11 parameters between a dipole antenna with a parasitic structure for enhanced isolation and a dipole antenna without a parasitic structure, as provided in an embodiment of the present invention.

[0023] Figure 5 The diagram illustrates a comparison of S21 parameters between a dipole antenna with a parasitic structure for enhanced isolation and a dipole antenna without a parasitic structure, as provided in an embodiment of the present invention.

[0024] Figure 6 This diagram illustrates a comparison of the azimuth radiation patterns of a dipole antenna with a parasitic structure for enhanced isolation and a dipole antenna without a parasitic structure, as provided in an embodiment of the present invention.

[0025] Figure 7 This diagram illustrates a comparison of the elevation patterns of a dipole antenna with a parasitic structure for enhanced isolation and a dipole antenna without a parasitic structure, as provided in an embodiment of the present invention.

[0026] Marked in the image: 10. Dielectric substrate; 20. First BLE antenna; 21. First radiating branch; 211. First metal segment; 212. Second metal segment; 213. Third metal segment; 22. Second radiating branch; 221. Fourth metal segment; 222. Fifth metal segment; 223. Sixth metal segment; 224. Seventh metal segment; 23. First feeder; 30. Second BLE antenna; 31. Third radiating branch; 311. Eighth metal segment; 312. Ninth metal segment; 313. Tenth metal segment; 32. Fourth radiating branch; 321. Eleventh metal segment; 322. Twelfth metal segment; 323. Thirteenth metal segment; 324. Fourteenth metal segment; 33. Second feeder; 40. Parasitic structure; 41. First metal strip; 42. Second metal strip; 43. Third metal strip. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of the present invention.

[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0029] To address the problems in the prior art where dipole antennas, when arranged in pairs with BLE antennas, lack an isolation structure and are affected by electromagnetic interference from adjacent BLE antennas, resulting in severe electromagnetic coupling and significant signal crosstalk, directly impacting ranging and positioning accuracy, this invention provides a dipole antenna with a parasitic structure to enhance isolation.

[0030] This invention provides a dipole antenna with a parasitic structure for enhanced isolation, such as... Figure 1As shown, it includes: a dielectric substrate 10, a first BLE antenna 20, a second BLE antenna 30, and a parasitic structure 40. The parasitic structure 40 is disposed on the dielectric substrate 10 and located in the middle of the dielectric substrate 10. The first BLE antenna 20 and the second BLE antenna 30 have the same structure and are symmetrically disposed on opposite sides of the dielectric substrate 10 relative to the parasitic structure 40. The first BLE antenna 20 and the second BLE antenna 30 are spaced apart by half a wavelength.

[0031] In this embodiment, the dielectric substrate 10 is a single-layer dielectric substrate 10, and the first BLE antenna 20, the second BLE antenna 30, and the parasitic structure 40 are printed on the dielectric substrate 10.

[0032] The first BLE antenna 20 and the second BLE antenna 30 are dipole antennas printed on a single-layer dielectric substrate, with a core operating frequency band of 2.4 GHz–2.4835 GHz.

[0033] In this embodiment, the first BLE antenna 20 and the second BLE antenna 30 have the same structure and are arranged symmetrically to ensure that the radiation performance of the first BLE antenna 20 and the second BLE antenna 30 is consistent. By setting a parasitic structure between the first BLE antenna 20 and the second BLE antenna 30, the electromagnetic coupling between the first BLE antenna 20 and the second BLE antenna 30 is weakened, and the isolation between the first BLE antenna 20 and the second BLE antenna 30 is enhanced. At the same time, the electromagnetic field distribution around the first BLE antenna 20 and the second BLE antenna 30 is optimized to avoid radiation pattern distortion.

[0034] In addition, by setting a parasitic structure 40 between the first BLE antenna 20 and the second BLE antenna 30, the isolation can be enhanced without sacrificing the basic performance of the first BLE antenna 20 and the second BLE antenna 30, without changing the structural parameters of the first BLE antenna 20 and the second BLE antenna 30 themselves. This results in strong compatibility and ease of mass production.

[0035] The first BLE antenna 20 and the second BLE antenna 30 are spaced apart by half a wavelength. While ensuring the communication performance of the first BLE antenna 20 and the second BLE antenna 30, the dipole antenna layout of this embodiment is compact and adaptable to the narrow installation space of the vehicle, so as to balance performance and space adaptability.

[0036] In this preferred embodiment, the first BLE antenna 20 includes a first radiating stub 21 and a second radiating stub 22, which are arranged vertically. The opposite ends of the first radiating stub 21 and the second radiating stub 22 are connected by a first feed line 23.

[0037] And / or, the second BLE antenna 30 includes a third radiating stub 31 and a fourth radiating stub 32, which are arranged vertically, and the opposite ends of the third radiating stub 31 and the fourth radiating stub 32 are connected by a second feed line 33.

[0038] Among them, the first feeder 23 and the second feeder 33 are coaxial cables or SMA connectors.

[0039] In this embodiment, the first radiating stub 21 and the second radiating stub 22 are arranged in a vertical direction, and the third radiating stub 31 and the fourth radiating stub 32 are arranged in a vertical direction to ensure the radiation efficiency of the dipole antenna in the 2.4GHz–2.4835GHz operating frequency band and meet the signal strength requirements of vehicle-mounted short-range communication.

[0040] In addition, differential feeding of the first radiating stub 21, the second radiating stub 22, the third radiating stub 31, and the fourth radiating stub 32 is achieved through the first feed line 23 and the second feed line 33, respectively, so that the excitation of the dipole antenna is balanced, avoiding radiation pattern distortion caused by feed imbalance, ensuring the omnidirectional radiation characteristics of the dipole antenna, and making this wet dipole antenna suitable for multi-directional communication scenarios such as keyless entry.

[0041] In this embodiment, the dipole antenna is fed via a coaxial cable or an SMA connector for external application.

[0042] In some alternative embodiments, the dipole antenna can also be directly connected to a chip or circuit via a microstrip line to enable embedded applications.

[0043] This embodiment is a preferred embodiment, and the specific structure of the parasitic structure 40 has been optimized.

[0044] In this embodiment, the parasitic structure 40 includes a first metal strip 41, a second metal strip 42, and a third metal strip 43. The first metal strip 41 and the second metal strip 42 are arranged parallel to each other in the horizontal direction, and the third metal strip 43 is arranged vertically between the first metal strip 41 and the second metal strip 42. The two ends of the third metal strip 43 are respectively connected to the first metal strip 41 and the second metal strip 42. The third metal strip 43, the first metal strip 41, and the second metal strip 42 form two U-shaped structures. The opening direction of the U-shaped structure is the same as the feeding end direction of the first BLE antenna 20 or the second BLE antenna 30 in the same direction.

[0045] In this embodiment, the first metal strip 41 and the second metal strip 42 are arranged horizontally parallel to each other, and the third metal strip 43 is arranged vertically between the first metal strip 41 and the second metal strip 42. The two ends of the third metal strip 43 are connected to the first metal strip 41 and the second metal strip 42 respectively to form a double U-shaped structure. This double U-shaped structure guides the current of the first BLE antenna 20 away from the adjacent second BLE antenna 30 through electromagnetic coupling. Simultaneously, it guides the current of the second BLE antenna 30 away from the adjacent first BLE antenna 20, making |S11| below -10dB and |S21| below 8dB within the operating frequency band of the first BLE antenna 20 and the second BLE antenna 30. This significantly reduces signal crosstalk and improves ranging accuracy. Figures 4-5 As shown.

[0046] The opening direction of the U-shaped structure is consistent with the feed direction of the first BLE antenna 20 or the second BLE antenna 30, which avoids blocking or interfering with the radiation field of the dipole antenna. This ensures that the parasitic structure 40 enhances isolation without destroying the omnidirectional radiation characteristics of the dipole antenna, and instead makes the radiation pattern more uniform.

[0047] In addition, the double U-shaped structure is precisely aligned with the first BLE antenna 20 and the second BLE antenna 30 symmetrically arranged on both sides, and can be adapted to two configurations: the first BLE antenna 20 and the second BLE antenna are back-to-back and the first BLE antenna 20 and the second BLE antenna are in the same direction. It can be compatible with different installation scenarios without changing the main shape of the parasitic structure 40, thus enhancing the flexibility of the solution.

[0048] Preferably, the two ends of the first metal strip 41 are bent toward the second metal strip 42, and the two ends of the second metal strip 42 are bent toward the first metal strip 41.

[0049] In this embodiment, the two ends of the first metal strip 41 are bent toward the second metal strip 42, and the two ends of the second metal strip 42 are bent toward the first metal strip 41, thereby increasing the electromagnetic coupling area between the parasitic structure 40 and the first BLE antenna 20 and the second BLE antenna 30, making the current guiding effect more significant.

[0050] In addition, the two ends of the first metal strip 41 are bent toward the second metal strip 42, and the two ends of the second metal strip 42 are bent toward the first metal strip 41, making the edge electromagnetic field of the parasitic structure 40 smoother, reducing the potential impact on the impedance matching of the first BLE antenna 20 and the second BLE antenna 30, ensuring that |S11| is always below -10dB, and maintaining good signal transmission efficiency.

[0051] In this preferred embodiment, the first BLE antenna 20 and the second BLE antenna are configured back-to-back.

[0052] Specifically, the first BLE antenna 20 and the second BLE antenna 30 have opposite radiation directions, and the parasitic structure 40 is perpendicular to the radiation directions of the first BLE antenna 20 and the second BLE antenna 30. The first feed line 23 of the first BLE antenna 20 extends from the side of the first BLE antenna 20 away from the second BLE antenna 30, and the second feed line 33 of the second BLE antenna 30 extends from the side of the second BLE antenna 30 away from the first BLE antenna 20.

[0053] In this embodiment, the first BLE antenna 20 and the second BLE antenna 30 are arranged back-to-back with opposite radiation directions, which can make full use of the narrow space in the vehicle and avoid spatial conflicts between the dipole antenna and other vehicle modules.

[0054] The first BLE antenna 20 and the second BLE antenna 30 have opposite radiation directions, which reduces the natural electromagnetic coupling between the first BLE antenna 20 and the second BLE antenna 30. Combined with the parasitic structure 40, this further enhances the anti-crosstalk capability of the dipole antenna.

[0055] This embodiment is a preferred embodiment, and the specific structure of the first BLE antenna 20 and the second BLE antenna 30 when they are configured back to back has been optimized.

[0056] Specifically, such as Figures 2-3 As shown, the first radiating stub 21 includes a first metal segment 211 extending horizontally from the feed point of the first feed line 23 toward the second BLE antenna 30, a second metal segment 212 extending vertically upward along the end of the first metal segment 211, and a third metal segment 213 extending horizontally along the end of the second metal segment 212 toward the direction away from the second BLE antenna 30. The second radiating stub 22 includes a fourth metal segment 221 arranged parallel to the first metal segment 211, a fifth metal segment 222 extending vertically downward along the end of the fourth metal segment 221, and a sixth metal segment 223 extending horizontally along the end of the fifth metal segment 222 in a direction away from the second BLE antenna 30. The fifth metal segment 222 and the second metal segment 212 are located on the same straight line. The end of the fourth metal segment 221 in the direction away from the second BLE antenna 30 extends into the direction of the first radiating stub 21 to form a seventh metal segment 224. The seventh metal segment 224 extends to the feed point of the first feed line 23. And / or, the third radiating stub 31 includes an eighth metal segment 311 extending horizontally from the feed point of the second feed line 33 toward the direction of the first BLE antenna 20, a ninth metal segment 312 extending vertically upward along the end of the eighth metal segment 311, and a tenth metal segment 313 extending horizontally along the end of the ninth metal segment 312 toward the direction away from the first BLE antenna 20. The fourth radiating stub 32 includes an eleventh metal segment 321 arranged parallel to the eighth metal segment 311, a twelfth metal segment 322 extending vertically downward along the end of the eleventh metal segment 321, and a thirteenth metal segment 323 extending horizontally along the end of the twelfth metal segment 322 in a direction away from the first BLE antenna 20. The ninth metal segment 312 and the twelfth metal segment 322 are located on the same straight line. The end of the eighth metal segment 311 in the direction away from the first BLE antenna 20 extends into the direction of the third radiating stub 31, forming a fourteenth metal segment 324. The fourteenth metal segment 324 extends to the feed point of the second feed line 33.

[0057] In this embodiment, the first radiating stub 21, the second radiating stub 22, the third radiating stub 31, and the fourth radiating stub 32 are each composed of multiple horizontal and vertical metal segments to ensure the stability of the resonant characteristics of the dipole antenna in the entire BLE band.

[0058] In this embodiment, the first BLE antenna 20 and the second BLE antenna 30 have the same structure and are arranged symmetrically to ensure that the radiation performance of the first BLE antenna 20 and the second BLE antenna 30 is consistent. By setting a parasitic structure between the first BLE antenna 20 and the second BLE antenna 30, the electromagnetic coupling between the first BLE antenna 20 and the second BLE antenna 30 is weakened, and the isolation between the first BLE antenna 20 and the second BLE antenna 30 is enhanced. At the same time, the electromagnetic field distribution around the first BLE antenna 20 and the second BLE antenna 30 is optimized to avoid radiation pattern distortion.

[0059] Specifically, such as Figure 4 As shown, in this embodiment, the dipole antenna consistently maintains a |S11| below -10dB across the entire operating frequency band. At the center frequency band of 2.45GHz, the |S11| reaches -15 to -18dB, with a smooth curve and no significant fluctuations.

[0060] like Figure 5 As shown, in this embodiment, the dipole antenna reduces |S21| by more than 8dB across the entire operating frequency band. At the center frequency band of 2.45GHz, |S21| drops from -12 to -15dB to -20 to -23dB. At the frequency edges of 2.4GHz and 2.4835GHz, |S21| remains below -18dB.

[0061] like Figure 6 As shown, the dipole antenna in this embodiment has uniform omnidirectional radiation gain, a maximum gain deviation of ≤1.2dB, no obvious signal dip area, and more stable omnidirectional radiation characteristics. Stable BLE signal reception can be achieved within a 360° range around the vehicle.

[0062] like Figure 7As shown, the dipole antenna in this embodiment has smooth radiation gain and stable signal strength within the elevation angle range, with a maximum deviation of ≤1.5dB. The gain difference between the vertical and horizontal directions is only 1.2dB, with no obvious signal gaps.

[0063] In some alternative embodiments, the first BLE antenna 20 and the second BLE antenna are configured in the same direction.

[0064] Specifically, the first BLE antenna 20 and the second BLE antenna 30 have the same radiation direction, and the parasitic structure 40 is set parallel to the radiation direction of the first BLE antenna 20 and the second BLE antenna 30. The first feed line 23 of the first BLE antenna 20 extends from the side of the first BLE antenna 20 opposite to the second BLE antenna 30, and the second feed line 33 of the second BLE antenna 30 extends from the side of the second BLE antenna 30 opposite to the first BLE antenna 20. The opposite ends of the first feed line 23 and the second feed line 33 are connected.

[0065] In this embodiment, the first BLE antenna 20 and the second BLE antenna 30 are arranged in the same direction with the same radiation direction, so that the main radiation directions of the first BLE antenna 20 and the second BLE antenna 30 are consistent, which improves the signal gain in a specific direction after the dipole antennas are superimposed, making it suitable for scenarios that require local signal enhancement, such as keyless entry and in-vehicle sensing.

[0066] The first feeder 23 and the second feeder 33 extend from the opposite sides of the first BLE antenna 20 and the second BLE antenna 30 and connect to each other, which facilitates docking with the centralized power supply interface of the vehicle host or chip, reduces the complexity of feeder wiring, and reduces the risk of electromagnetic interference.

[0067] The parasitic structure 40 is set parallel to the radiation direction of the first BLE antenna 20 and the second BLE antenna 30, which specifically weakens the coupling interference between the first BLE antenna 20 and the second BLE antenna 30 in the same direction. Even when the radiation directions of the first BLE antenna 20 and the second BLE antenna 30 are the same, it can still maintain a reduction of more than 8dB in |S21|, which meets the requirements of high-precision positioning in vehicles.

[0068] This embodiment is a preferred embodiment, and the specific structure of the first BLE antenna 20 and the second BLE antenna 30 when they are configured in the same direction has been optimized.

[0069] Specifically, the first radiating stub 21 includes a first metal segment 211 extending horizontally from the feed point of the first feed line 23 toward the direction away from the second BLE antenna 30, a second metal segment 212 extending vertically upward along the end of the first metal segment 211, and a third metal segment 213 extending horizontally along the end of the second metal segment 212 toward the direction of the second BLE antenna 30. The second radiating stub 22 includes a fourth metal segment 221 arranged parallel to the first metal segment 211, a fifth metal segment 222 extending vertically downward along the end of the fourth metal segment 221, and a sixth metal segment 223 extending horizontally along the end of the fifth metal segment 222 toward the direction of the second BLE antenna 30. The fifth metal segment 222 and the second metal segment 212 are located on the same straight line. The end of the fourth metal segment 221 opposite to the second BLE antenna 30 extends into a seventh metal segment 224 toward the direction of the first radiating stub 21. The seventh metal segment 224 extends to the feed point of the first feed line 23. And / or, the third radiating stub 31 includes an eighth metal segment 311 extending horizontally from the feed point of the second feed line 33 toward the direction of the first BLE antenna 20, a ninth metal segment 312 extending vertically upward along the end of the eighth metal segment 311, and a tenth metal segment 313 extending horizontally along the end of the ninth metal segment 312 toward the direction away from the first BLE antenna 20. The fourth radiating stub 32 includes an eleventh metal segment 321 arranged parallel to the eighth metal segment 311, a twelfth metal segment 322 extending vertically downward along the end of the eleventh metal segment 321, and a thirteenth metal segment 323 extending horizontally along the end of the twelfth metal segment 322 toward the direction of the first BLE antenna 20. The ninth metal segment 312 and the twelfth metal segment 322 are located on the same straight line. The fourteenth metal segment 324 extends from the opposite end of the eighth metal segment 311 toward the direction of the third radiating stub 31. The fourteenth metal segment 324 extends to the feed point of the second feed line 33.

[0070] In this embodiment, the first radiating stub 21, the second radiating stub 22, the third radiating stub 31 and the fourth radiating stub 32 are each composed of multiple horizontal and vertical metal segments, which not only ensures that the electrical length of the radiating stubs is precisely matched to the BLE frequency band, but also avoids the spatial conflict between the first BLE antenna 20 and the second BLE antenna 30 under the same orientation, making the dielectric substrate 10 more compact.

[0071] In addition, the symmetrical bending design of the first radiating stub 21, the second radiating stub 22, the third radiating stub 31, and the fourth radiating stub 32 makes the radiation field distribution of the dipole antenna more uniform, avoids local signal blind spots, and is suitable for scenarios that require full-area coverage, such as in-vehicle sensing.

[0072] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0074] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0075] In this invention, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0076] Although the description of the invention has been given in conjunction with the specific embodiments described above, it will be apparent to those skilled in the art that many substitutions, modifications, and variations can be made based on the foregoing. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A dipole antenna with a parasitic structure for enhanced isolation, characterized in that, include: The dielectric substrate (10), the first BLE antenna (20), the second BLE antenna (30) and the parasitic structure (40) are disposed on the dielectric substrate (10) and located in the middle of the dielectric substrate (10). The first BLE antenna (20) and the second BLE antenna (30) have the same structure and are symmetrically disposed on opposite sides of the dielectric substrate (10) relative to the parasitic structure (40). The first BLE antenna (20) and the second BLE antenna (30) are spaced apart by half a wavelength.

2. A dipole antenna with a parasitic structure for enhanced isolation according to claim 1, characterized in that, The first BLE antenna (20) includes a first radiating stub (21) and a second radiating stub (22). The first radiating stub (21) and the second radiating stub (22) are arranged in a vertical direction, and the opposite ends of the first radiating stub (21) and the second radiating stub (22) are connected by a first feed line (23). And / or, the second BLE antenna (30) includes a third radiating stub (31) and a fourth radiating stub (32), the third radiating stub (31) and the fourth radiating stub (32) being arranged in a vertical direction, and the opposite ends of the third radiating stub (31) and the fourth radiating stub (32) being connected by a second feed line (33).

3. A dipole antenna with a parasitic structure for enhanced isolation according to claim 1, characterized in that, The parasitic structure (40) includes a first metal strip (41), a second metal strip (42), and a third metal strip (43). The first metal strip (41) and the second metal strip (42) are arranged parallel to each other in the horizontal direction. The third metal strip (43) is arranged vertically between the first metal strip (41) and the second metal strip (42). The two ends of the third metal strip (43) are respectively connected to the first metal strip (41) and the second metal strip (42). The third metal strip (43), the first metal strip (41), and the second metal strip (42) form two U-shaped structures. The opening direction of the U-shaped structure is the same as the feeding end direction of the first BLE antenna (20) or the second BLE antenna (30) in the same direction.

4. A dipole antenna with a parasitic structure for enhanced isolation according to claim 3, characterized in that, The two ends of the first metal strip (41) are bent toward the second metal strip (42), and the two ends of the second metal strip (42) are bent toward the first metal strip (41).

5. A dipole antenna with a parasitic structure for enhanced isolation according to claim 2, characterized in that, The first BLE antenna (20) and the second BLE antenna (30) have opposite radiation directions, and the parasitic structure (40) is perpendicular to the radiation directions of the first BLE antenna (20) and the second BLE antenna (30); The first feed line (23) of the first BLE antenna (20) extends from the side of the first BLE antenna (20) away from the second BLE antenna (30), and the second feed line (33) of the second BLE antenna (30) extends from the side of the second BLE antenna (30) away from the first BLE antenna (20).

6. A dipole antenna with a parasitic structure for enhanced isolation according to claim 5, characterized in that, The first radiating stub (21) includes a first metal segment (211) extending horizontally from the feed point of the first feed line (23) toward the second BLE antenna (30), a second metal segment (212) extending vertically upward along the end of the first metal segment (211), and a third metal segment (213) extending horizontally away from the end of the second metal segment (212) toward the direction away from the second BLE antenna (30). The second radiating stub (22) includes a fourth metal segment (221) arranged parallel to the first metal segment (211), a fifth metal segment (222) extending vertically downward along the end of the fourth metal segment (221), and a sixth metal segment (223) extending horizontally away from the second BLE antenna (30) along the end of the fifth metal segment (222). The fifth metal segment (222) and the second metal segment (212) are located on the same straight line. The end of the fourth metal segment (221) away from the second BLE antenna (30) extends into a seventh metal segment (224) towards the first radiating stub (21). The seventh metal segment (224) extends to the feed point of the first feed line (23). And / or, the third radiating stub (31) includes an eighth metal segment (311) extending horizontally from the feed point of the second feed line (33) toward the first BLE antenna (20), a ninth metal segment (312) extending vertically upward along the end of the eighth metal segment (311), and a tenth metal segment (313) extending horizontally along the end of the ninth metal segment (312) toward the direction away from the first BLE antenna (20). The fourth radiating stub (32) includes an eleventh metal segment (321) arranged parallel to the eighth metal segment (311), a twelfth metal segment (322) extending vertically downward along the end of the eleventh metal segment (321), and a thirteenth metal segment (323) extending horizontally away from the first BLE antenna (20) along the end of the twelfth metal segment (322). The ninth metal segment (312) and the twelfth metal segment (322) are located on the same straight line. The end of the eighth metal segment (311) away from the first BLE antenna (20) extends into a fourteenth metal segment (324) towards the third radiating stub (31). The fourteenth metal segment (324) extends to the feed point of the second feed line (33).

7. A dipole antenna with a parasitic structure for enhanced isolation according to claim 2, characterized in that, The first BLE antenna (20) and the second BLE antenna (30) have the same radiation direction, and the parasitic structure (40) is arranged parallel to the radiation direction of the first BLE antenna (20) and the second BLE antenna (30); The first feed line (23) of the first BLE antenna (20) extends from the side of the first BLE antenna (20) opposite to the second BLE antenna (30), and the second feed line (33) of the second BLE antenna (30) extends from the side of the second BLE antenna (30) opposite to the first BLE antenna (20). The opposite ends of the first feed line (23) and the second feed line (33) are connected.

8. A dipole antenna with a parasitic structure for enhanced isolation according to claim 7, characterized in that, The first radiating stub (21) includes a first metal segment (211) extending horizontally from the feed point of the first feed line (23) toward the direction away from the second BLE antenna (30), a second metal segment (212) extending vertically upward along the end of the first metal segment (211), and a third metal segment (213) extending horizontally along the end of the second metal segment (212) toward the direction of the second BLE antenna (30). The second radiating stub (22) includes a fourth metal segment (221) arranged parallel to the first metal segment (211), a fifth metal segment (222) extending vertically downward along the end of the fourth metal segment (221), and a sixth metal segment (223) extending horizontally along the end of the fifth metal segment (222) toward the second BLE antenna (30). The fifth metal segment (222) and the second metal segment (212) are located on the same straight line. The end of the fourth metal segment (221) opposite to the second BLE antenna (30) extends into a seventh metal segment (224) toward the first radiating stub (21). The seventh metal segment (224) extends to the feed point of the first feed line (23). And / or, the third radiating stub (31) includes an eighth metal segment (311) extending horizontally from the feed point of the second feed line (33) toward the first BLE antenna (20), a ninth metal segment (312) extending vertically upward along the end of the eighth metal segment (311), and a tenth metal segment (313) extending horizontally along the end of the ninth metal segment (312) toward the direction away from the first BLE antenna (20). The fourth radiating stub (32) includes an eleventh metal segment (321) arranged parallel to the eighth metal segment (311), a twelfth metal segment (322) extending vertically downward along the end of the eleventh metal segment (321), and a thirteenth metal segment (323) extending horizontally along the end of the twelfth metal segment (322) toward the first BLE antenna (20). The ninth metal segment (312) and the twelfth metal segment (322) are located on the same straight line. The eighth metal segment (311) extends a fourteenth metal segment (324) toward the third radiating stub (31) from the opposite end of the first BLE antenna (20). The fourteenth metal segment (324) extends to the feed point of the second feed line (33).

9. A dipole antenna with a parasitic structure for enhanced isolation according to claim 2, characterized in that, The first feeder (23) and the second feeder (33) are coaxial cables or SMA connectors.

10. A dipole antenna with a parasitic structure for enhanced isolation according to claim 1, characterized in that, The dielectric substrate (10) is a single-layer dielectric substrate (10), and the first BLE antenna (20), the second BLE antenna (30) and the parasitic structure (40) are printed on the dielectric substrate (10).

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