Indoor ultra-wideband transparent directional antenna

Abstract

The invention provides an indoor ultra-wideband transparent directional antenna, which comprises a transparent outer cover, a transparent bottom plate, a base, a first rhombus array and a second rhombus array, and is characterized in that each of the first rhombus array and the second rhombus array comprises four transparent oscillators, and the four transparent oscillators are arranged in a rhombus shape; the first rhombus array is connected with the first feed network, and the second rhombus array is connected with the second feed network. The diamond array can maximize the diagonal distance between the units, which is crucial for suppressing the grating lobes of the antenna, especially for suppressing the grating lobes at the high-frequency end. And the grating lobes can cause energy to radiate towards unwanted directions, so that the gain and efficiency of the antenna are reduced. The four transparent oscillator diamond arrays achieve good balance among performance, flexibility, complexity and cost.

Description

Technical Field

[0001] This invention relates to the field of communication antenna technology, and more specifically, to an indoor ultra-wideband transparent directional antenna. Background Technology

[0002] Transparent antennas offer significant advantages for high-end applications. While they are highly transparent, offer superior performance, and are flexible in installation, making them crucial for solving deep coverage issues, they suffer from narrower frequency bands and insufficient sharing capabilities. Transparent ceiling-mounted antennas for indoor distribution scenarios can achieve relatively large operating bandwidths (supporting 700-2700MHz); however, transparent wide-angle antennas and indoor transparent directional antennas for high-rise building coverage have narrower operating bandwidths (supporting 1700-2700MHz or 3300-3700MHz) and cannot support multi-operator sharing.

[0003] Currently, transparent antennas are relatively expensive. The core components of transparent antennas involve the processing of transparent substrates and transparent conductive films, with the processing cost of the transparent conductive film accounting for over 60% to 80% of the core component cost. The price of a transparent antenna for building-to-building applications is 2.5 to 5 times that of a standard spotlight antenna procured through centralized procurement, and 20% higher than the price of a new type of building antenna; the price of a transparent ceiling-mounted antenna is 12 to 46 times that of a standard ceiling-mounted antenna procured through centralized procurement.

[0004] Most narrow-band transparent antenna elements are in the form of transparent microstrip patches. The signal is transmitted from the feed line to the radiating patch through a non-direct contact, coupled feeding method, thereby generating radiation. Currently, the following are some widely used schemes to achieve transparency of the conductive layer: (1) metal mesh; (2) silver nanowires; (3) indium tin oxide; (4) metallic ink.

[0005] The working principle of a metal mesh is as follows: extremely fine metal wires (usually copper or silver) are made into a grid pattern, below the resolution of the human eye, thus achieving a "transparent" effect. The gaps in the grid allow light to pass through, while the metal wires provide conductive paths.

[0006] The working principle of silver nanowires is as follows: silver nanowires with a diameter of 20-50 nanometers and a length of 20-50 micrometers are coated into a random network. Light passes through the gaps between the nanowires, and the random network structure provides interconnected conductive paths.

[0007] The working principle of indium tin oxide is as follows: an n-type semiconductor material is deposited on a substrate through vacuum processes such as magnetron sputtering to form a thin film that is both conductive and transparent.

[0008] The working principle of metallic ink is as follows: metal nanoparticles (mainly silver) are dispersed in a solvent to form ink, which is then printed on a substrate through graphic processes such as screen printing and inkjet printing. After low-temperature sintering, a conductive layer is formed.

[0009] In the prior art, CN119208975 discloses a directional transparent antenna, relating to the field of communication technology. It includes a transparent outer cover, an L-shaped mounting bracket connected to the end of the bracket furthest from the base, and transparent elements arranged sequentially from left to right on the front face of the inner cavity of the transparent outer cover. A power divider is located at the bottom of the inner cavity of the base, and two sets of radio frequency cable assemblies are located at the center of the bottom of the base. Both the transparent elements and the transparent reflector are equipped with transparent antenna films. The transparent antenna films are made of low-sheet-resistance PET material, with a metal layer adhered to the film. The metal layer uses a metal mesh pattern, exhibiting performance consistent with traditional copper foil or metal surfaces, and effectively reducing light shading, resulting in a light transmittance of over 80% for the entire element. The operating frequency band is 1690-2690MHz, and the size can be adjusted according to the frequency band to achieve matching with any frequency band in the range of 698-960MHz and 3300-4200MHz. The mounting bracket is fixedly connected to the base, and the large bracket can be rotated as needed to achieve a wide range of vertical tilt angle adjustments.

[0010] CN119890677A discloses a broadband transparent oscillator, relating to the field of communication technology. It includes a base plate, a balun at the top center of the base plate, two sets of oscillator plates arranged in a cross shape on the top of the balun, support columns at both ends of the top of each set of oscillator plates, parasitic unit plates mounted on the top of each set of oscillator plates via the support columns, coupling ground layers on both sides of the top center of each oscillator plate, and oscillator radiation surfaces on both sides of the bottom of each oscillator plate. The transparent oscillator of this invention has high light transmittance; when used with a transparent radome, it can make the entire base station antenna highly transparent, highly concealed, and has a decoupling effect. It is suitable for multi-frequency environments and miniaturization requirements, offering good light transmittance, aesthetics, decoupling, suitability for multi-frequency environments, and lightweight design. The oscillator can achieve good radiation performance and impedance matching in an ultra-wideband range of 690-960MHz.

[0011] CN119994466A discloses a green transparent broadband oscillator, relating to the field of communication technology. It includes a base plate with two baluns (one and two) intersecting at the top center. A radiating sheet is connected to the top of both baluns. A hole (one) matching the bottom of baluns is located at the top center of the base plate, and a hole (two) matching the top of baluns is located at the center of the radiating sheet. Balun 2 includes a balun 2 PC body, with balun 2 PET films on both its front and rear ends. This transparent oscillator has high light transmittance; when used with a transparent radome, it can make the entire base station antenna highly transparent and concealed, suitable for multi-frequency environments and miniaturization requirements. It features good light transmittance, aesthetics, high gain, lightweight design, ultra-wideband characteristics, and dual polarization characteristics. This oscillator can achieve good radiation performance in the 3300-4200MHz ultra-wideband range.

[0012] Therefore, existing transparent antennas have narrow frequency bands and insufficient sharing capabilities. Currently, there are no ultra-wideband narrow beam transparent antennas available on the market for indoor use environments such as stadiums. Summary of the Invention

[0013] This invention provides an indoor ultra-wideband transparent directional antenna to achieve an ultra-wideband narrow beam, reduce signal coverage overlap and sidelobe interference, and lower antenna costs.

[0014] To achieve the above objectives, the present invention provides an indoor ultra-wideband transparent directional antenna, comprising a transparent outer cover, a transparent base plate, a base, a first rhombic array, and a second rhombic array. The base plate is disposed at the bottom of the transparent outer cover, and the transparent base plate is disposed on the base and located inside the transparent outer cover. The first and second rhombic arrays are disposed on the transparent base plate, each including four transparent elements arranged in a rhombic pattern. The transparent base plate is provided with two feed networks, namely a first feed network and a second feed network. The first rhombic array is connected to the first feed network, and the second rhombic array is connected to the second feed network. The input ports of both the first and second feed networks are located on the base. The base is provided with at least two waterproof connector sleeves, and an RF cable connector assembly passes through the waterproof connector sleeves and connects to the input ports of the first and second feed networks.

[0015] Furthermore, the centers of the first and second rhomboid arrays are on a horizontal line, and are 2.5-3 center wavelengths apart;

[0016] The first rhombus array includes four guide plates, which are fixed one-to-one with the four transparent oscillators of the first rhombus array;

[0017] The second rhombus array includes four guide plates, which are fixed one-to-one with the four transparent oscillators of the second rhombus array.

[0018] Furthermore, the two transparent oscillators in the horizontal direction and the two transparent oscillators in the vertical direction of the first rhombic array are equally spaced, with a spacing of 1.3-1.7 times the center wavelength of free space;

[0019] The two transparent elements in the horizontal direction and the two transparent elements in the vertical direction of the second rhombic array are equally spaced, with a spacing of 1.3-1.7 times the center wavelength of free space.

[0020] Furthermore, a first isolation strip and a second isolation strip are respectively provided on the two diagonal directions of the first rhombic array. The first isolation strip and the second isolation strip are respectively fixed on the transparent base plate, and the first isolation strip and the second isolation strip isolate the four transparent oscillators in the first rhombic array.

[0021] The second rhombus array has a first isolation strip and a second isolation strip on its two diagonal directions. The first isolation strip and the second isolation strip are fixed to the transparent base plate, and the first isolation strip and the second isolation strip isolate the four transparent oscillators in the second rhombus array.

[0022] Furthermore, a third isolation strip and a fourth isolation strip are provided around the first rhombus array. The distance between the third isolation strip and the center of the first rhombus array is 1.5-1.7 times the vacuum wavelength of the center frequency. The third isolation strip and the fourth isolation strip are fixed on the transparent base plate respectively.

[0023] The second rhombus array is surrounded by a third and a fourth isolation strip. The distance between the third and fourth isolation strips and the center of the second rhombus array is 1.5-1.7 times the vacuum wavelength of the center frequency. The third and fourth isolation strips are fixed to the transparent base plate.

[0024] Furthermore, each transparent oscillator includes an oscillator radiating surface, a first feed plate, and a second feed plate. Both the first and second feed plates have opening slots. The first and second feed plates are interlocked through the opening slots to form a mutually perpendicular structure. The upper ends of the first and second feed plates are inserted into the oscillator radiating surface, and the lower ends of the first and second feed plates are inserted into and fixed to the transparent base plate. Each transparent oscillator is connected to the corresponding feed network on the front side of the transparent base plate and the grounding layer on the bottom side of the transparent base plate.

[0025] Furthermore, the first power supply network is configured as a cascaded 1-to-4 splitter, including a primary 1-to-2 splitter and two secondary 1-to-2 splitters. Each secondary 1-to-2 splitter is a further 1-to-2 splitter from each output of the primary 1-to-2 splitter. Each secondary 1-to-2 splitter is connected to two transparent elements of the first rhombus array. Specifically, one secondary 1-to-2 splitter is connected to the two transparent elements in the upper left corner of the first rhombus array, and the other secondary 1-to-2 splitter is connected to the two transparent elements in the upper right corner of the first rhombus array.

[0026] The second power supply network is configured as a cascaded 1-to-4 splitter, including a primary 1-to-2 splitter and two secondary 1-to-2 splitters. Each secondary 1-to-2 splitter is a further split of each output of the primary 1-to-2 splitter. Each secondary 1-to-2 splitter is connected to two transparent elements of the second rhombus array. Specifically, one secondary 1-to-2 splitter is connected to the two transparent elements in the upper left corner of the second rhombus array, and the other secondary 1-to-2 splitter is connected to the two transparent elements in the upper right corner of the second rhombus array.

[0027] Furthermore, both ends of the base are connected to the metal bracket via L-shaped connecting plates. The pitch angle of the indoor ultra-wideband transparent directional antenna can be adjusted by rotating the L-shaped connecting plates. The bottom of the metal bracket has multiple holes, one of which is the central hole. The metal bracket is rotatably mounted on the mounting frame. The indoor ultra-wideband transparent directional antenna rotates horizontally around the mounting frame with the central hole as the center. The two holes on the left and right sides near the central hole are rotation holes. The horizontal position of the indoor ultra-wideband transparent directional antenna can be adjusted by rotating the rotation holes.

[0028] Furthermore, the transparent oscillator, transparent base plate, transparent outer cover, and guide plate are all made of light-transmitting PC;

[0029] The transparent oscillator, transparent base plate, transparent outer cover, and guide plate are all equipped with transparent conductive film. The substrate of the transparent conductive film is PET, the conductive layer of the transparent conductive film is copper, and the transparent conductive film adopts a metal mesh method.

[0030] Furthermore, the operating frequency band of the transparent oscillator and the power supply network on the transparent base plate is 1700-3700MHz.

[0031] In this scheme, within a specific antenna size, the rhombus array maximizes the diagonal distance between elements, which is crucial for suppressing antenna grating lobes, especially at high frequencies. Grating lobes cause energy to radiate in unwanted directions, reducing antenna gain and efficiency. A four-transparent rhombus array is a design that achieves a good balance between performance, flexibility, complexity, and cost. This invention allows for more rational arrangement within limited space, optimizing antenna layout, achieving ultra-wideband narrow beams, reducing the overall antenna area, lowering the physical space required for installation, enhancing layout flexibility in complex or space-constrained scenarios, and reducing costs. This scheme achieves four-port shared ultra-wideband performance on a transparent substrate, unmatched by traditional metal antennas. The synergistic optimization of the radiator, feed network, and rhombus array structure achieves excellent electrical and radiation pattern performance, concentrating signal energy towards the target area, effectively enhancing signal strength in the target area while reducing interference in other directions, thus improving network capacity and signal quality. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figure 1 A schematic diagram of the external structure of an indoor ultra-wideband transparent directional antenna provided for an embodiment of the present invention;

[0034] Figure 2A schematic diagram of the internal structure of an indoor ultra-wideband transparent directional antenna provided for an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of the isolation strip for an indoor ultra-wideband transparent directional antenna;

[0036] Figure 4 A schematic diagram of the feed network for an indoor ultra-wideband transparent directional antenna;

[0037] Figure 5 A schematic diagram of a diamond array for an indoor ultra-wideband transparent directional antenna;

[0038] Figure 6 Side view of the transparent outer casing of an indoor ultra-wideband transparent directional antenna;

[0039] Figure 7 A schematic diagram of the transparent outer casing of an indoor ultra-wideband transparent directional antenna;

[0040] Figure 8 A diagram showing the horizontal elevation adjustment of an indoor ultra-wideband transparent directional antenna;

[0041] Figure 9 Standing wave diagram of an indoor ultra-wideband transparent directional antenna;

[0042] Figure 10 The horizontal radiation pattern of an indoor ultra-wideband transparent directional antenna in the 1700MHz-2700MHz range;

[0043] Figure 11 The vertical plane radiation pattern of an indoor ultra-wideband transparent directional antenna in the 1700MHz-2700MHz range;

[0044] Figure 12 The horizontal radiation pattern of an indoor ultra-wideband transparent directional antenna in the 3300MHz-3700MHz range;

[0045] Figure 13 The vertical radiation pattern of an indoor ultra-wideband transparent directional antenna in the 3300MHz-3700MHz range;

[0046] Figure 14 This is a diagram of the transparent conductive film structure of an indoor ultra-wideband transparent directional antenna.

[0047] Figure 15 Front-to-back comparison of the 1700MHz-2700MHz horizontal band for an indoor ultra-wideband transparent directional antenna;

[0048] Figure 16 Front-to-back aspect ratio of an indoor ultra-wideband transparent directional antenna in the 3300MHz-3700MHz horizontal band;

[0049] Figure 17Isolation diagram for an indoor ultra-wideband transparent directional antenna;

[0050] Figure 18 This is a schematic diagram of the radiating surface of the dipole, the first feed plate, and the second feed plate of an indoor ultra-wideband transparent directional antenna.

[0051] The above figures include the following reference numerals:

[0052] 1. Transparent outer cover; 111. First slot; 112. Second slot; 113. Third slot; 114. Fourth slot; 115. Top arc shape;

[0053] 2. Base; 3. L-shaped connecting plate; 4. Metal bracket; 5. Waterproof connector sleeve; 6. Transparent oscillator; 7. Guide plate; 8. Transparent base plate; 9. First isolation strip; 10. Second isolation strip; 11. Third isolation strip; 12. Fourth isolation strip;

[0054] 13. Power supply network; 14. First rhomboid array; 15. Second rhomboid array; 16. Mounting bracket; 17. Oscillator radiating surface; 18. First power supply piece; 19. Second power supply piece. Detailed Implementation

[0055] The technical solutions in at least one embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one embodiment is merely illustrative and is not intended to limit this application or its applications. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application.

[0056] like Figures 1 to 18 As shown, an embodiment of the present invention provides an indoor ultra-wideband transparent directional antenna, including a transparent outer cover 1, a transparent base plate 8, a base 2, a first rhombus array 14, and a second rhombus array 15. The base 2 is disposed at the bottom of the transparent outer cover 1, and the transparent base plate 8 is disposed on the base 2 and located inside the transparent outer cover 1. The first rhombus array 14 and the second rhombus array 15 are disposed on the transparent base plate 8, and each of the first rhombus array 14 and the second rhombus array 15 includes four transparent elements 6, which are arranged in a rhombus shape. The transparent base plate 8 is provided with two feed networks 13, namely the first feed network and the second feed network. The first rhombus array 14 is connected to the first feed network, and the second rhombus array 15 is connected to the second feed network. The input ports of the first feed network and the second feed network are both located on the base 2. The base 2 is provided with at least two waterproof connector sleeves 5, and the radio frequency cable connector assembly passes through the waterproof connector sleeves 5 and is connected to the input ports of the first feed network and the second feed network.

[0057] In this scheme, within a specific antenna size, the rhomboid array maximizes the diagonal distance between elements, which is crucial for suppressing antenna grating lobes, especially at high frequencies. Grating lobes cause energy to radiate in unwanted directions, reducing antenna gain and efficiency. A rhomboid array of four transparent elements 6 is a design that achieves a good balance between performance, flexibility, complexity, and cost. This invention allows for more rational arrangement within limited space, optimizing antenna layout, achieving ultra-wideband narrow beams, reducing the overall antenna area, lowering the physical space required for installation, enhancing layout flexibility in complex or space-constrained scenarios, and reducing costs. This scheme achieves four-port shared ultra-wideband performance on a transparent base plate 8, unmatched by traditional metal antennas. The synergistic optimization of the radiator, feed network 13, and rhomboid array structure achieves excellent electrical and radiation pattern performance, concentrating signal energy towards the target area, effectively enhancing signal strength in the target area while reducing interference in other directions, thus improving network capacity and signal quality.

[0058] like Figure 4 As shown, the transparent base plate 8 is rectangular, with chamfered corners at the four top corners to ensure that it does not interfere with the interior of the transparent outer cover 1.

[0059] like Figure 6 and Figure 7 As shown, the top four corners of the transparent outer cover 1 are curved, and there are two other curved sections at the top of the transparent outer cover 1. The thickness of the transparent outer cover 1 is sloping from the top to the bottom, that is, it is thin at the top and thick at the bottom.

[0060] The transparent outer cover 1 has four precision-designed slots on three sides: the first slot 111, the second slot 112, the third slot 113, and the fourth slot 114. The transparent base plate 8 can be precisely embedded in the four slots, making the connection method firm and reliable.

[0061] like Figure 7 As shown, the transparent outer cover 1 protects the transparent oscillator 6 and the power supply network 13. The transparent outer cover 1 has a specific arched structure with an arc 115 at the top, which significantly improves the pressure resistance and impact resistance of the transparent outer cover while ensuring the overall thinness.

[0062] In this scheme, the centers of the first rhombus array 14 and the second rhombus array 15 are on a horizontal line and are 2.5-3 center wavelengths apart; the first rhombus array 14 includes four guide pieces 7, which are fixed to the four transparent oscillators 6 of the first rhombus array 14 in a one-to-one correspondence; the second rhombus array 15 includes four guide pieces 7, which are fixed to the four transparent oscillators 6 of the second rhombus array 15 in a one-to-one correspondence.

[0063] Within a specific antenna size, a rhombus array maximizes the diagonal distance between elements, which is crucial for suppressing grating lobes, especially at high frequencies. Grating lobes cause energy to radiate in unwanted directions, reducing antenna gain and efficiency. A rhombus array of four transparent elements offers a good balance between performance, flexibility, complexity, and cost. This invention allows for more efficient arrangement within limited space, optimizing antenna layout, achieving ultra-wideband narrow beams, reducing the overall antenna area, lowering the physical space required for installation, enhancing layout flexibility in complex or space-constrained scenarios, and reducing costs.

[0064] Specifically, the two transparent oscillators 6 in the horizontal direction and the two transparent oscillators 6 in the vertical direction of the first rhombic array 14 are equally spaced, with a spacing of 1.3-1.7 times the center wavelength of free space; the two transparent oscillators 6 in the horizontal direction and the two transparent oscillators 6 in the vertical direction of the second rhombic array 15 are equally spaced, with a spacing of 1.3-1.7 times the center wavelength of free space.

[0065] like Figure 2 , Figure 3 and Figure 5 As shown, the first rhombus array 14 has a first isolation strip 9 and a second isolation strip 10 on its two diagonal directions, respectively. The first isolation strip 9 and the second isolation strip 10 are fixed on the transparent base plate 8, and the first isolation strip 9 and the second isolation strip 10 isolate the four transparent oscillators 6 in the first rhombus array 14. The second rhombus array 15 has a first isolation strip 9 and a second isolation strip 10 on its two diagonal directions, respectively. The first isolation strip 9 and the second isolation strip 10 are fixed on the transparent base plate 8, and the first isolation strip 9 and the second isolation strip 10 isolate the four transparent oscillators 6 in the second rhombus array 15.

[0066] Furthermore, the first rhombus array 14 is provided with a third isolation strip 11 and a fourth isolation strip 12 around its perimeter. The distance between the third isolation strip 11 and the fourth isolation strip 12 and the center of the first rhombus array 14 is 1.5-1.7 times the vacuum wavelength of the center frequency. The third isolation strip 11 and the fourth isolation strip 12 are respectively fixed on the transparent base plate 8. The second rhombus array 15 is provided with a third isolation strip 11 and a fourth isolation strip 12 around its perimeter. The distance between the third isolation strip 11 and the fourth isolation strip 12 and the center of the second rhombus array 15 is 1.5-1.7 times the vacuum wavelength of the center frequency. The third isolation strip 11 and the fourth isolation strip 12 are respectively fixed on the transparent base plate 8.

[0067] like Figure 18As shown, each transparent oscillator 6 includes an oscillator radiating surface 17, a first feed plate 18, and a second feed plate 19. Both the first feed plate 18 and the second feed plate 19 have opening slots. The first feed plate 18 and the second feed plate 19 are embedded in each other through the opening slots to form a mutually perpendicular structure. The upper ends of the first feed plate 18 and the second feed plate 19 are inserted into the oscillator radiating surface 17, and the lower ends of the first feed plate 18 and the second feed plate 19 are inserted into and fixed to the transparent base plate 8. Each transparent oscillator 6 is connected to the corresponding feed network 13 on the front side of the transparent base plate 8 and the grounding layer on the bottom surface of the transparent base plate 8.

[0068] During assembly, a simple two-layer fixture is used. The first layer fixture is used to place the first feed plate 18 and the second feed plate 19 in sequence, and they are embedded at 90° through the slot. The slot is then aligned with the radiating surface 17 of the vibrator. The second layer fixture is then attached and locked to ensure that each vibrator is at the same height and perpendicular to each other. Finally, a low-temperature welding process is used to weld them into a transparent vibrator 6.

[0069] Each welded transparent oscillator 6 is then connected to the corresponding guide plate 7. The oscillator radiation surface 17 on the transparent oscillator 6 and the guide plate 7 have two corresponding round holes. The transparent plastic nylon column is connected to the two round holes corresponding to the oscillator radiation surface through transparent plastic screws, and the oscillator component assembly and welding are completed.

[0070] The transparent base plate 8 is placed on a simple fixture. Eight pre-welded vibrator components are inserted into the transparent base plate 8 through pre-drilled holes. The second layer of fixture is then fitted and locked in place to ensure that each vibrator in the rhomboid array is not tilted, ensuring high consistency and making welding convenient and simple. A low-temperature welding method is then used to ensure that the corresponding lines of the vibrator components are connected to the transparent base plate 8 and to the ground on the back of the transparent base plate 8. The lines are connected, and the connection is reliable and secure. The welding is complete, and the semi-finished antenna is now complete, forming two first rhomboid arrays 14 and a second rhomboid array 15.

[0071] The oscillator components are welded to the transparent base plate 8, resulting in a bare machine state. The bare machine still requires assembly at the boundary. Specifically, the bare machine is placed on a simple two-layer fixture, and the first isolation strip 9, the second isolation strip 10, the third isolation strip 11, and the fourth isolation strip 12 are placed into their respective slots in sequence. Figure 2 and Figure 5It is known that each rhomboid array is surrounded by four isolation strips: three first isolation strips 9 and one second isolation strip 10. Two rhomboid arrays require a total of eight isolation strips (9 and 10). The distance between the first and second isolation strips 9 and 10 and the center of the rhomboid array is between 1.5 and 1.7 times the vacuum wavelength of the center frequency. The third and fourth isolation strips 11 and 12 are embedded between the four radiating elements of the rhomboid array. A transparent base plate 8 is perforated and fixed to the bare unit with glue. After the glue dries, the solder input port is installed and the unit is placed inside the transparent outer cover. The first and second isolation strips 9 and 10 primarily optimize the antenna pattern, particularly improving beamforming in the high-frequency band and sidelobe suppression. The third and fourth isolation strips 11 and 12 mainly improve standing wave isolation.

[0072] like Figure 4 As shown, the first power supply network is configured as a cascaded 1-to-4 splitter, including a primary 1-to-2 splitter and two secondary 1-to-2 splitters. Each secondary 1-to-2 splitter further splits each output of the primary 1-to-2 splitter into two. Each secondary 1-to-2 splitter is connected to two transparent vibrators 6 of the first rhombus array 14. One secondary 1-to-2 splitter is connected to the two transparent vibrators 6 at the upper left corner of the first rhombus array 14, and the other secondary 1-to-2 splitter is connected to the two transparent vibrators 6 at the upper right corner of the first rhombus array 14. The second power supply network is configured as a cascaded 1-to-4 splitter, including a primary 1-to-2 splitter and two secondary 1-to-2 splitters. Each secondary 1-to-2 splitter further splits each output of the primary 1-to-2 splitter into two. Each secondary 1-to-2 splitter is connected to two transparent vibrators 6 of the second rhombus array 15. One secondary 1-to-2 splitter is connected to the two transparent vibrators 6 at the upper left corner of the second rhombus array 15, and the other secondary 1-to-2 splitter is connected to the two transparent vibrators 6 at the upper right corner of the second rhombus array 15. Among them, the power supply network input port in the transparent base plate 8 is located inside the base, concealing the solder joints and RF cables.

[0073] like Figure 1 and Figure 8 As shown, the two ends of the base 2 are connected to the metal bracket 4 through L-shaped connecting plates 3 respectively. The pitch angle of the indoor ultra-wideband transparent directional antenna can be adjusted by rotating the L-shaped connecting plates 3. The bottom of the metal bracket 4 has multiple holes, one of which is the center hole. The metal bracket 4 is rotatably mounted on the mounting frame 16. The indoor ultra-wideband transparent directional antenna rotates horizontally around the mounting frame 16 with the center hole as the center. The two holes on the left and right sides near the center hole are rotation holes. The position of the indoor ultra-wideband transparent directional antenna in the horizontal direction can be adjusted by rotating the rotation holes.

[0074] In this design, the transparent oscillator 6, transparent base plate 8, transparent outer cover 1, and guide plate 7 are all made of transparent PC. The transparent oscillator 6, transparent base plate 8, transparent outer cover 1, and guide plate 7 are all provided with transparent conductive film. The substrate of the transparent conductive film is PET, the conductive layer of the transparent conductive film is copper, and the transparent conductive film adopts a metal mesh method.

[0075] In this scheme, the operating frequency band of the power supply network 13 on the transparent oscillator 6 and the transparent base plate 8 is 1700-3700MHz.

[0076] like Figure 1 and Figure 2 As shown, the plastic nuts are removed from the four waterproof connector sleeves 5 one by one. The main body of the waterproof connector sleeve 5 passes through the front of the base 2, and is then locked by removing the plastic nuts to ensure that the base is in the middle of the waterproof connector sleeve 5. The four RF cable connector assemblies pass through these loose sleeves into the transparent outer cover 1 and connect to the input port of the feed network 13 to ensure stable signal transmission. After the input port is soldered, the waterproof connector sleeves 5 are locked to ensure that the RF cable connectors will not pull on the feed network 13.

[0077] like Figure 8 As shown, the L-shaped connecting plate 3 is connected to the metal bracket 4 by M10 screws and nuts. The two L-shaped connecting plates 3 are marked with ±45° increments, with each 5-degree increment representing a larger unit. By rotating the L-shaped connecting plate 3, the antenna's elevation direction can be adjusted within ±45°. The metal bracket 4 has five holes. The central hole is the center hole, and the antenna's horizontal rotation is centered on the center hole of the mounting bracket 16 and the metal bracket 4. The holes on the outermost sides of the metal bracket 4 are angle selection holes, and the holes closest to the center hole are rotation holes. By rotating the metal bracket 4, the antenna's horizontal direction can be selected within ±20°.

[0078] like Figure 14 As shown, the transparent conductive film uses PET as the substrate and copper as the conductive layer. Through a metal mesh method, it supports a power tolerance of 50W. The metal mesh adopts a rectangular process with a line width of 30µm and a line spacing of 300µm, achieving a low sheet resistance of 0.05 ohms / hole, a large power tolerance, and good intermodulation suppression. The low resistance improves the gain, and the metal mesh method achieves a light transmittance of more than 80% for the transparent conductive film.

[0079] Low-temperature solder wire and low-temperature soldering method are used to ensure good and stable circuit connection performance after soldering, and the PC material will not be melted.

[0080] Figure 9This is a simulation diagram of the 1700-3700MHz standing wave ratio as a function of frequency points in an embodiment of the present invention. It can be seen that the standing wave ratio is below 1.45 across the entire frequency band, indicating that the return loss of each port of the antenna is below -14dB. Among them, the standing wave ratio of 1.4 or below in the 1700-2700MHz range is considered to be in a good standing wave state.

[0081] like Figure 10 , Figure 11 The figure shown is a simulation result of the radiation pattern in the horizontal plane of 1700-2700MHz according to an embodiment of the present invention. It can be seen that the horizontal 3dB bandwidth in the 1700-2700MHz range is 29.7°-40.7°, and the vertical 3dB bandwidth is 30.6°-41.5°. The relative deviation between the horizontal and vertical 3dB bandwidths is small, and the consistency is good. The sidelobe suppression is above 20dB, which is very good.

[0082] like Figure 12 , Figure 13 The figure shown is a simulation result of the radiation pattern in the horizontal plane of 3300-3700MHz according to an embodiment of the present invention. It can be seen that the horizontal 3dB bandwidth in the 1700-2700MHz range is 19.4°-21.2°, and the vertical 3dB bandwidth is 18.4°-23.1°. The relative deviation between the horizontal and vertical 3dB bandwidths is not large, and the consistency is good. The sidelobe suppression is above 16dB.

[0083] like Figure 15 , Figure 16 The figure shows the simulation results of the front-to-back ratio at the 1700-2700MHz level and the front-to-back ratio at the 3300-3700MHz level, according to an embodiment of the present invention. It can be seen that the front-to-back ratio at the 1700-2700MHz level is greater than 23.5, and the front-to-back ratio at the 3300-3700MHz level is greater than 26.3.

[0084] like Figure 17 The figure is a simulation diagram of the isolation variation of 1700-3700MHz with frequency points in embodiment 1 of the present invention. It can be seen that the isolation of the 1700-2700MHz band is above 22.5, and the isolation of the 3300-3700MHz and 1700-2700MHz bands is 24.7. Actual debugging is required to meet the isolation of more than 25 for the two bands.

[0085] This invention addresses the need for antennas in scenarios with high requirements for environmental integration in antenna deployment. It proposes an indoor ultra-wideband transparent directional antenna supporting the 1700-3700MHz frequency band. This antenna achieves both transparency, aesthetics, and concealment, while also providing an ultra-wideband narrow beam, reducing signal coverage overlap and sidelobe interference. It can be shared by multiple operators, reducing antenna cost and size, improving network coverage, lowering operator procurement costs, and enriching the transparent antenna family.

[0086] The indoor ultra-wideband transparent directional antenna provided in this solution has the following technical advantages:

[0087] 1. Traditional directional antennas and current transparent directional antennas are basically in the frequency bands of 698-960MHz, 1710-2690MHz, or 3300-3800MHz. This invention provides a four-port shared 1700-3700MHz ultra-wideband directional transparent antenna. The frequency band is wider than that of existing directional transparent antennas. Each of the four ports can work independently and simultaneously cover an extremely wide frequency range.

[0088] 2. In comparison, antennas for specific scenarios use different vibrators in the 1710-2690MHz and 3300-3700MHz frequency bands for arraying. Transparent antennas also generally adopt a separate vibrator scheme. Since the manufacturing cost of transparent materials accounts for over 60%-80% of the core component cost, this invention combines the two types of vibrators into a single ultra-wideband transparent vibrator array to reduce manufacturing costs. This reduces the area of ​​transparent material used and the antenna size, thereby reducing costs. Compared to the cost-saving approach of the separate vibrator scheme, the wideband integrated design of this product is superior in cost to the "separate vibrator" combination scheme of transparent antennas.

[0089] 3. Visually imperceptible transparent design: a balance between aesthetics and function. "Transparency" is not only an aesthetic pursuit, but also aims to reduce the presence of equipment in the indoor environment, achieving "omnipresent signal coverage with antenna equipment hidden invisibly." Environmental integration: It hardly obstructs the view or light, perfectly blending into the modern public space environment and meeting the stringent aesthetic requirements of high-end scenarios.

[0090] 4. Through a series of innovative designs, this antenna achieves unparalleled four-port shared ultra-wideband performance on a transparent substrate, a feat difficult to match by traditional metal antennas. Its electrical and pattern performance is the result of coordinated optimization of the radiator, feed network, and rhomboid array structure. This means that signal energy is concentrated and transmitted towards the target area, effectively enhancing the signal strength in the target area while reducing interference in other directions, thus improving network capacity and signal quality.

[0091] 5. The indoor ultra-wideband transparent directional antenna of this invention can enrich the system of high-end applications in special scenarios and fill the family of transparent antennas for specific scenarios.

[0092] The above descriptions are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0093] The technical features of the embodiments described above 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 the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification.

[0094] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0095] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0096] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0097] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0098] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

Claims

1. An indoor ultra-wideband transparent directional antenna, characterized in that, The device includes a transparent outer cover (1), a transparent base plate (8), a base (2), a first rhombus array (14), and a second rhombus array (15). The base (2) is located at the bottom of the transparent outer cover (1), and the transparent base plate (8) is located on the base (2) and inside the transparent outer cover (1). The first rhombus array (14) and the second rhombus array (15) are located on the transparent base plate (8). Both the first rhombus array (14) and the second rhombus array (15) include four transparent oscillators (6), and the four transparent oscillators (6) are rhomboid in shape. Arrangement; the transparent base plate (8) is provided with two power supply networks (13), namely the first power supply network and the second power supply network. The first diamond array (14) is connected to the first power supply network, and the second diamond array (15) is connected to the second power supply network. The input ports of the first power supply network and the second power supply network are both located on the base (2). The base (2) is provided with at least two waterproof connector sleeves (5). The radio frequency cable connector assembly passes through the waterproof connector sleeves (5) and is connected to the input ports of the first power supply network and the second power supply network.

2. The indoor ultra-wideband transparent directional antenna according to claim 1, characterized in that, The centers of the first rhombus array (14) and the second rhombus array (15) are on a horizontal line and are 2.5-3 center wavelengths apart; The first rhombus array (14) includes four guide pieces (7), and the four guide pieces (7) are fixed one-to-one with the four transparent oscillators (6) of the first rhombus array (14). The second rhomboid array (15) includes four guide pieces (7), which are fixed one-to-one with the four transparent oscillators (6) of the second rhomboid array (15).

3. The indoor ultra-wideband transparent directional antenna according to claim 1, characterized in that, The two transparent oscillators (6) in the horizontal direction and the two transparent oscillators (6) in the vertical direction of the first rhombic array (14) are equally spaced, with a spacing of 1.3-1.7 times the center wavelength of free space; The two transparent oscillators (6) in the horizontal direction and the two transparent oscillators (6) in the vertical direction of the second rhombic array (15) are spaced equally, with a spacing of 1.3-1.7 times the center wavelength of free space.

4. The indoor ultra-wideband transparent directional antenna according to claim 1, characterized in that, The first rhomboid array (14) has a first isolation strip (9) and a second isolation strip (10) on its two diagonal directions. The first isolation strip (9) and the second isolation strip (10) are fixed on the transparent base plate (8). The first isolation strip (9) and the second isolation strip (10) isolate the four transparent oscillators (6) in the first rhomboid array (14). The second rhomboid array (15) has a first isolation strip (9) and a second isolation strip (10) on its two diagonal directions. The first isolation strip (9) and the second isolation strip (10) are fixed on the transparent base plate (8). The first isolation strip (9) and the second isolation strip (10) isolate the four transparent oscillators (6) in the second rhomboid array (15).

5. The indoor ultra-wideband transparent directional antenna according to claim 1, characterized in that, The first rhombus array (14) is provided with a third isolation strip (11) and a fourth isolation strip (12) around its perimeter. The distance between the third isolation strip (11), the fourth isolation strip (12) and the center of the first rhombus array (14) is 1.5-1.7 times the vacuum wavelength of the center frequency. The third isolation strip (11) and the fourth isolation strip (12) are respectively fixed on the transparent base plate (8). The second rhombus array (15) is provided with a third isolation strip (11) and a fourth isolation strip (12) around its perimeter. The distance between the third isolation strip (11), the fourth isolation strip (12) and the center of the second rhombus array (15) is 1.5-1.7 times the vacuum wavelength of the center frequency. The third isolation strip (11) and the fourth isolation strip (12) are respectively fixed on the transparent base plate (8).

6. The indoor ultra-wideband transparent directional antenna according to claim 1, characterized in that, Each of the transparent oscillators (6) includes an oscillator radiating surface (17), a first feed plate (18), and a second feed plate (19). The first feed plate (18) and the second feed plate (19) are provided with opening slots. The first feed plate (18) and the second feed plate (19) are embedded in each other through the opening slots to form a mutually perpendicular structure. The upper ends of the first feed plate (18) and the second feed plate (19) are inserted into the oscillator radiating surface (17). The lower ends of the first feed plate (18) and the second feed plate (19) are inserted into and fixed to the transparent base plate (8). Each of the transparent oscillators (6) is connected to the corresponding feed network (13) on the front side of the transparent base plate (8) and the grounding layer on the bottom surface of the transparent base plate (8).

7. The indoor ultra-wideband transparent directional antenna according to claim 1, characterized in that, The first power supply network is configured as a cascaded 1-to-4 split, including a primary 1-to-2 split and two secondary 1-to-2 splits. Each secondary 1-to-2 split is a further split of each output of the primary 1-to-2 split. Each secondary 1-to-2 split is connected to two transparent oscillators (6) of the first rhombus array (14). One secondary 1-to-2 split is connected to the two transparent oscillators (6) at the upper left corner of the first rhombus array (14), and the other secondary 1-to-2 split is connected to the two transparent oscillators (6) at the upper right corner of the first rhombus array (14). The second power supply network is configured as a cascaded 1-to-4 split, including a primary 1-to-2 split and two secondary 1-to-2 splits. Each secondary 1-to-2 split is a further split of each output of the primary 1-to-2 split. Each secondary 1-to-2 split is connected to two transparent oscillators (6) of the second rhombus array (15). One secondary 1-to-2 split is connected to the two transparent oscillators (6) at the upper left corner of the second rhombus array (15), and the other secondary 1-to-2 split is connected to the two transparent oscillators (6) at the upper right corner of the second rhombus array (15).

8. The indoor ultra-wideband transparent directional antenna according to claim 1, characterized in that, The two ends of the base (2) are connected to the metal bracket (4) through L-shaped connecting plates (3). The angle of the indoor ultra-wideband transparent directional antenna in the pitch direction can be adjusted by rotating the L-shaped connecting plates (3). The bottom of the metal bracket (4) has multiple holes, one of which is the central hole. The metal bracket (4) is rotatably mounted on the mounting frame (16). The indoor ultra-wideband transparent directional antenna rotates horizontally around the mounting frame (16) with the central hole as the center. The two holes on the left and right sides close to the central hole are rotation holes. The position of the indoor ultra-wideband transparent directional antenna in the horizontal direction can be adjusted through the rotation holes.

9. The indoor ultra-wideband transparent directional antenna according to claim 2, characterized in that, The transparent oscillator (6), the transparent base plate (8), the transparent outer cover (1), and the guide plate (7) are all made of light-transmitting PC; The transparent oscillator (6), the transparent base plate (8), the transparent outer cover (1), and the guide plate (7) are all provided with transparent conductive films. The substrate of the transparent conductive film is PET, the conductive layer of the transparent conductive film is copper, and the transparent conductive film adopts a metal mesh method.

10. The indoor ultra-wideband transparent directional antenna according to claim 1, characterized in that, The operating frequency bands of the transparent oscillator (6) and the power supply network (13) on the transparent base plate (8) are both 1700-3700MHz.

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