A dual-band filtering patch antenna structure for implementing UWB audio transmission and positioning

Abstract

The utility model discloses a kind of dual-frequency filtering patch antenna structures achieving UWB audio transmission and positioning, including PCB dielectric plate, rectangular patch antenna and rectangular metal floor, U-shaped groove is equipped in the middle area of rectangular patch antenna, rectangular patch antenna is formed E-shaped structure on by left and right transverse groove on rectangular patch antenna, left and right one-word groove is respectively arranged in the position of left and right sides of rectangular patch antenna close to left and right transverse groove tail end;Whole antenna is formed dual-band characteristic antenna structure by E-shaped structure cooperation U-shaped groove, the electromagnetic radiation suppression of non-working frequency band is introduced by left and right one-word groove, to realize filtering antenna structure.Such that the performance of dual-frequency filtering radiation is achieved, without introducing metal short-circuit column and any branch loading structure, so as to simplify structure.And design multi-slot structure not only can realize dual-frequency electromagnetic radiation, audio transmission and high-precision positioning discrimination ability is higher, and it is convenient for large-scale processing application.

Description

Technical Field

[0001] This utility model relates to the field of wireless communication technology, and in particular to a dual-frequency filter patch antenna structure for UWB audio transmission and positioning. Background Technology

[0002] Compared to traditional wireless communication technologies, UWB (Ultra-Wideband) boasts high data transmission rates and precise positioning capabilities. Due to its use of higher frequency bands and wider bandwidth, UWB effectively reduces interference, ensuring stable audio transmission and providing headphones with higher quality lossless, high-resolution audio, becoming a key factor in improving the audio transmission quality of wireless audio products. Beyond its superior audio playback, UWB also offers excellent positioning capabilities, providing centimeter-level accuracy, making it easy for users to find objects and solving everyday problems. However, most patch antenna units in current UWB applications are single-band antennas, enabling only single-channel wireless data transmission. Single-channel communication is susceptible to external interference from Wi-Fi, Bluetooth, or other UWB devices, and multipath effects can lead to performance degradation. Dual-channel communication, in addition to using frequency hopping to switch to a clean channel, can intelligently select the optimal channel through real-time monitoring. Furthermore, it can utilize two different frequencies to obtain positioning information of the same target, reducing the slight phase difference caused by frequency differences and improving positioning accuracy. Simultaneously, it can enhance system capacity and reduce collisions, enabling load sharing and spatial multiplexing. Most importantly, the system can rapidly and randomly switch between two channels, enhancing product security and anti-spoofing capabilities. However, some current dual-antenna structures are quite complex, making them unsuitable for large-scale manufacturing and application. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a dual-frequency filter patch antenna structure that is simpler in structure, more rational in design, capable of transmitting high-quality audio data and high-precision positioning, and suitable for large-scale processing and application, enabling UWB audio transmission and positioning.

[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a dual-band filtered patch antenna structure for UWB audio transmission and positioning, including a PCB substrate, a rectangular patch antenna disposed on the top of the PCB substrate, and a rectangular metal ground plane disposed on the bottom of the PCB substrate, wherein the rectangular patch antenna is connected to the rectangular metal ground plane; a U-shaped slot is provided in the middle area of ​​the rectangular patch antenna, and a left horizontal slot and a right horizontal slot are respectively provided on the left and right sides of the U-shaped slot on the rectangular patch antenna, forming an E-shaped structure on the rectangular patch antenna through the left and right horizontal slots; a left slot and a right slot are respectively provided on the left and right sides of the rectangular patch antenna near the tail of the left and right horizontal slots, and the left slot and right slot are parallel to the left and right horizontal slots; the E-shaped structure combined with the U-shaped slot forms a dual-band characteristic antenna structure for the entire antenna, and the electromagnetic radiation suppression of non-operating frequency bands is introduced through the left and right slots to achieve the filtered antenna structure.

[0005] Furthermore, the feed point of the entire antenna is located on the straight line of the center of symmetry of the antenna geometry.

[0006] Furthermore, the U-shaped groove forms a symmetrical structure about the feed point.

[0007] Furthermore, the E-shaped structure formed by the left and right transverse slots on the rectangular patch antenna constitutes a symmetrical structure about the feed point.

[0008] Furthermore, the left and right slots form a symmetrical structure with respect to the power supply point.

[0009] Furthermore, the U-shaped slot is located at the center of the rectangular patch antenna.

[0010] Furthermore, the left and right horizontal slots are respectively located near the bottom edges of the rectangular patch antenna on both sides, and close to the bottom of the U-shaped slot.

[0011] Furthermore, the left and right slots are respectively located on both sides of the rectangular patch antenna near the top edge and close to the top of the U-shaped slot.

[0012] Furthermore, the rectangular patch antenna is connected to the rectangular metal ground plane using a coaxial cable. The outer conductor of the coaxial cable is soldered to the rectangular metal ground plane, and the inner conductor is soldered to the rectangular patch antenna.

[0013] Preferably, the rectangular metal floor is the same size as the PCB substrate.

[0014] This invention employs a multi-slot patch antenna structure, utilizing symmetrical U-shaped slots and E-shaped structures about the feed point to achieve dual-frequency resonance. Simultaneously, a linear slot suppresses electromagnetic radiation in non-operating frequency bands to achieve a filtering effect, achieving dual-frequency filtering radiation performance. This simplifies the structure by eliminating the need for any additional loading structures such as metal short-circuit posts. Furthermore, the multi-slot design not only enables dual-frequency electromagnetic radiation, improving high-quality audio transmission and high-precision positioning capabilities, but also facilitates large-scale manufacturing and application due to its simple structure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a structural schematic diagram of the present invention from another angle;

[0017] Figure 3 The diagram shows the return loss curve and actual gain curve of this utility model.

[0018] Figure 4 The XZ-plane radiation pattern of the antenna of this invention at 6.5 GHz is shown.

[0019] Figure 5 The radiation pattern of the antenna of this invention on the YZ-plane at 6.5 GHz is shown.

[0020] Figure 6 This is the XZ-plane radiation pattern of the antenna of this invention at 8 GHz;

[0021] Figure 7 This is the radiation pattern of the antenna of this invention on the YZ-plane at 8 GHz.

[0022] In the diagram, 1 is the PCB substrate, 2 is the rectangular metal ground plane, 3 is the rectangular patch antenna, 4 is the U-shaped slot, 51 is the left horizontal slot, 52 is the right horizontal slot, 61 is the left straight slot, 62 is the right straight slot, and 7 is the coaxial cable. Detailed Implementation

[0023] In this embodiment, refer to Figure 1 and Figure 2The dual-frequency filter patch antenna structure for realizing UWB audio transmission and positioning includes a PCB substrate 1, a rectangular patch antenna 3 disposed on the top of the PCB substrate 1, and a rectangular metal ground plane 2 disposed on the bottom of the PCB substrate 1. The rectangular metal ground plane 2 has the same size as the PCB substrate 1. The dielectric constant of the PCB substrate 1 is 4.05, the loss tangent is 0.0068, and the thickness is 1.524mm. A rectangular patch antenna 3 is connected to a rectangular metal ground plane 2. A U-shaped slot 4 is provided in the middle area of ​​the rectangular patch antenna 3. A left horizontal slot 51 and a right horizontal slot 52 are respectively provided on the left and right sides of the U-shaped slot 4 on the rectangular patch antenna 3, forming an E-shaped structure on the rectangular patch antenna 3 through the left horizontal slot 51 and the right horizontal slot 52. A left straight slot 61 and a right straight slot 62 are respectively provided on the left and right sides of the rectangular patch antenna 3 near the tail ends of the left and right horizontal slots 51 and 52. The left straight slot 61 and the right straight slot 62 are parallel to the left and right horizontal slots 51 and 52. The size of the rectangular patch antenna can be 9.2mm*9.5mm. The dual-band characteristics are achieved by opening a U-shaped slot 4 with a size of 2mm*4.8mm and the left and right horizontal slots 51 and 52 with a length of 5.6mm. The left straight slot 61 and the right straight slot 62 introduce electromagnetic radiation suppression of non-operating frequency bands to achieve a filtering effect. Ultimately, this invention enables dual-band filtering radiation at 6.5GHz and 8GHz, introduces a transmission null point at 7GHz, and suppresses electromagnetic interference at 7-7.5GHz, below 6GHz, and above 8.5GHz.

[0024] The feed point of the entire antenna is located on the straight line of the center of symmetry of the antenna geometry. The U-shaped slot 4 forms a left-right symmetrical structure about the feed point. The E-shaped structure formed by the left horizontal slot 51 and the right horizontal slot 52 also forms a left-right symmetrical structure about the feed point. The left and right slots 61 and 62 form a left-right symmetrical structure about the feed point, ensuring that the antenna radiation pattern has no angular offset distortion. The U-shaped slot 4 is located at the center of the rectangular patch antenna. The left and right horizontal slots 51 and 52 are respectively located near the bottom edges of the rectangular patch antenna 3 and close to the bottom of the U-shaped slot 4. The left and right slots 61 and 62 are respectively located near the top edges of the rectangular patch antenna 3 and close to the top of the U-shaped slot 4.

[0025] The rectangular patch antenna 3 is connected to the rectangular metal ground plane 2 by a coaxial cable 7. The outer conductor of the coaxial cable 7 is soldered to the rectangular metal ground plane 2, and the inner conductor is soldered to the rectangular patch antenna 3.

[0026] By creating an E-shaped structure through U-shaped slots, left and right horizontal slots 51 and 52, and a straight slot, three resonant modes and a transmission zero point are introduced, achieving dual-frequency filtering radiation. This ensures that high-quality audio data and high-precision positioning can be transmitted within the working frequency band, while also being protected from electromagnetic interference in non-working frequency bands. No additional filter is needed in the RF front-end to suppress electromagnetic radiation in non-working frequency bands.

[0027] like Figure 3 As shown, in the S11 parameter response of the antenna, it can be seen that the dual-frequency filter patch antenna unit has three resonant points, which are 6.44GHz, 6.64GHz and 8GHz, respectively, to achieve dual-frequency electromagnetic radiation of 6.5GHz and 8GHz.

[0028] Figure 3 The curve in the middle represents the actual gain. From the actual gain response of the dual-frequency filtered patch antenna unit, it can be seen that the patch antenna's electromagnetic radiation is in the 6.5GHz and 8GHz bands, and the transmission null point is in the 7GHz band. It achieves dual-frequency electromagnetic radiation and electromagnetic filtering. In the actual product's RF front end, the dual-frequency filtering effect can be achieved without introducing an additional filter, thus avoiding electromagnetic interference in non-operating frequency bands.

[0029] like Figure 4 The image shows the radiation pattern of a dual-frequency filtered patch antenna element on the xz-plane (phi=0) at 6.5 GHz. The upper curve represents the main polarization pattern, and the lower curve represents the cross-polarization pattern.

[0030] Figure 5 The image shows the radiation pattern of a dual-frequency filtered patch antenna element on the yz-plane (phi=90) at 6.5 GHz. The upper curve represents the main polarization pattern, and the lower curve represents the cross-polarization pattern.

[0031] Figure 6 The image shows the radiation pattern of a dual-frequency filtered patch antenna element on the xz-plane (phi=0) at 8 GHz. The upper curve represents the main polarization pattern, and the lower curve represents the cross-polarization pattern.

[0032] Figure 7 The image shows the radiation pattern of a dual-frequency filtered patch antenna element on the yz-plane (phi=90) at 8 GHz. The upper curve represents the main polarization pattern, and the lower curve represents the cross-polarization pattern.

[0033] Depend on Figures 4-7It can be seen that, in the operating channels of 6.5GHz and 8GHz, within a viewing angle range of ±180 degrees, the main polarization component of the dual-frequency filter patch antenna element is about 25dB greater than the cross-polarization component, that is, the cross-polarization ratio is >25dB. This ensures the directivity and accuracy of the antenna's angle resolution.

[0034] Typically, in engineering applications, the |S11| of the antenna port is required to be less than -6dB, and the cross-polarization ratio is required to be greater than 12dB. This is the normal standard, meaning that the multimode broadband antenna element in this invention can be used to distinguish angles and distances, while also ensuring a large throughput during data transmission, thus realizing the functions of UWB audio transmission and positioning.

[0035] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A dual-band filtered patch antenna structure for UWB audio transmission and positioning, comprising a PCB substrate, a rectangular patch antenna disposed on the top of the PCB substrate, and a rectangular metal ground plane disposed on the bottom of the PCB substrate, wherein the rectangular patch antenna is connected to the rectangular metal ground plane, characterized in that: A U-shaped slot is provided in the middle area of ​​the rectangular patch antenna. A left horizontal slot and a right horizontal slot are respectively provided on the left and right sides of the U-shaped slot on the rectangular patch antenna. The left and right horizontal slots form an E-shaped structure on the rectangular patch antenna. A left slit slot and a right slit slot are respectively provided on the left and right sides near the tail of the left and right horizontal slots. The left and right slit slots are parallel to the left and right horizontal slots. The E-shaped structure and the U-shaped slot form a dual-band characteristic antenna structure. The left and right slit slots introduce electromagnetic radiation suppression of non-operating frequency bands to achieve a filtered antenna structure.

2. The dual-frequency filter patch antenna structure for UWB audio transmission and positioning according to claim 1, characterized in that: The feed point of the entire antenna is located on the straight line of the center of symmetry of the antenna geometry.

3. The dual-frequency filter patch antenna structure for realizing UWB audio transmission and positioning according to claim 2, characterized in that: The U-shaped groove forms a symmetrical structure about the feed point.

4. The dual-frequency filter patch antenna structure for realizing UWB audio transmission and positioning according to claim 2, characterized in that: The E-shaped structure formed by the left and right horizontal slots on the rectangular patch antenna is symmetrical about the feed point.

5. The dual-frequency filter patch antenna structure for realizing UWB audio transmission and positioning according to claim 1, characterized in that: The left and right slots form a symmetrical structure with respect to the power supply point.

6. The dual-frequency filter patch antenna structure for realizing UWB audio transmission and positioning according to claim 1, characterized in that: The U-shaped slot is located at the center of the rectangular patch antenna.

7. The dual-frequency filter patch antenna structure for realizing UWB audio transmission and positioning according to claim 1, characterized in that: The left and right horizontal slots are respectively located near the bottom edges of the rectangular patch antenna on both sides, and close to the bottom of the U-shaped slot.

8. The dual-frequency filter patch antenna structure for realizing UWB audio transmission and positioning according to claim 1, characterized in that: The left and right slots are respectively located on both sides of the rectangular patch antenna near the top edge and close to the top of the U-shaped slot.

9. The dual-frequency filter patch antenna structure for realizing UWB audio transmission and positioning according to claim 1, characterized in that: The rectangular patch antenna is connected to the rectangular metal ground plane using a coaxial cable. The outer conductor of the coaxial cable is soldered to the rectangular metal ground plane, and the inner conductor is soldered to the rectangular patch antenna.

10. The dual-frequency filter patch antenna structure for realizing UWB audio transmission and positioning according to claim 1, characterized in that: The rectangular metal floor is the same size as the PCB substrate.

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