Planar miniaturized high-isolation dual-band antenna

Abstract

A planar miniaturized high-isolation dual-band antenna disclosed by the present invention comprises a mainboard body, the upper surface of the mainboard body is provided with a radiation unit and a resonant ring which are connected, and the lower surface of the mainboard body is provided with a first floor slot unit and a second floor slot unit. The radiation unit and the resonant ring are distributed above the first floor slot unit, the second floor slot unit is arranged beside the first floor slot unit, and the radiation unit, the resonant ring, the first floor slot unit and the second floor slot unit are all located at corners of the mainboard body. The effect of saving the size of the antenna system is achieved through the radiation unit, the resonance ring and the first floor slot unit and the second floor slot unit formed in the lower surface of the mainboard body, and the radiation unit and the resonance ring are distributed above the first floor slot unit and stacked, so that the size is saved; the resonant ring is added on the basis of the radiation unit, so that the impedance bandwidth of the antenna is changed into multiple frequency bands, and the bandwidth of the antenna is improved.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a planar miniaturized high-isolation dual-band antenna. Background Art

[0002] Traditional mobile phone antennas are mainly divided into two categories: external antennas and internal antennas. With the development of mobile communications, internal antennas currently account for the vast majority of the market share. In addition, as people's pursuit of higher and higher, mobile phones have become more and more sophisticated. The increasing intelligence of mobile phones is inseparable from many powerful hardware as support. For example, full network access, NFC, dual SIM dual standby, etc. have become essential configurations of mobile phones. In addition, the configuration of hardware modules such as GPS, camera, compass, etc. has increased, which has also made the space for mobile phone antennas smaller and smaller. As a terminal device, mobile phone antennas have become the research and development direction and requirements of terminal antennas in order to adapt to the needs of the market and users. Small size, multi-band, wide frequency band, low cost and other characteristics have become the research and development direction and requirements of terminal antennas.

[0003] In order to improve the isolation between antenna systems, the prior art mainly achieves a higher isolation by increasing the distance between antenna units, but this will result in a larger volume of the antenna system, which is not conducive to the miniaturization design of the mobile terminal. Summary of the invention

[0004] The main purpose of the present invention is to provide a planar miniaturized high-isolation dual-band antenna, aiming to solve the problem that the antenna system has a large volume and is not conducive to the miniaturization design of a mobile terminal.

[0005] To achieve the above-mentioned purpose, the present invention proposes a planar miniaturized high-isolation dual-band antenna, including a main board body, the upper surface of which is provided with a connected radiation unit and a resonant ring, the lower surface of which is provided with a first floor gap unit and a second floor gap unit, the radiation unit and the resonant ring are distributed above the first floor gap unit, the second floor gap unit is arranged next to the first floor gap unit, and the radiation unit, the resonant ring, the first floor gap unit and the second floor gap unit are all located at the corners of the main board body.

[0006] In one embodiment, the first floor gap unit is provided with a bending structure, the bending structure is in a stepped shape, and the resonant ring is located above the bending structure.

[0007] In one embodiment, the first floor gap unit is L-shaped, and an outer right angle of the L-shape of the first floor gap unit forms a diagonal with a right angle of the main board body.

[0008] In one embodiment, the radiation unit is L-shaped, and the outer right angle of the L-shape of the first floor gap unit and the outer right angle of the L-shape of the radiation unit form a diagonal.

[0009] In one embodiment, the radiation unit is a metal sheet with a length of 15 mm and a width of 6.7 mm.

[0010] In one embodiment, the second floor gap unit is T-shaped.

[0011] In one embodiment, the resonant ring includes a first rectangular ring and a second rectangular ring, the opening sizes of the first rectangular ring and the second rectangular ring are equal, the shape of the first rectangular ring is larger than the shape of the second rectangular ring, the second rectangular ring is located on the inner side of the first rectangular ring, and the first rectangular ring and the second rectangular ring are in the same plane.

[0012] In one embodiment, the distance between the resonant ring and the long side of the radiation unit is in the range of 0-0.2 mm.

[0013] In one embodiment, the distance between the resonant ring and the wide side of the radiation unit is in the range of 0-2 mm.

[0014] In one embodiment, the size of the main board body is 140mm*70mm*1mm, a dielectric plate is arranged on the main board body, the material of the dielectric plate is FR4 material, the dielectric constant of the dielectric plate is 4.4, and the thickness of the dielectric plate is 1.6mm.

[0015] The present invention achieves the effect of saving the volume of the antenna system by arranging connected radiation units and resonant rings on the upper surface of the mainboard body and opening a first floor gap unit and a second floor gap unit on the lower surface of the mainboard body. The radiation units and the resonant rings are distributed and stacked above the first floor gap unit to save volume. Adding a resonant ring on the basis of the radiation unit makes the antenna impedance bandwidth become multi-band, thereby improving the bandwidth of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 This is a front view of a planar miniaturized high-isolation dual-band antenna;

[0018] Figure 2This is a schematic diagram of the back side of a planar miniaturized high-isolation dual-band antenna;

[0019] Figure 3 This is a schematic diagram of the front structure of the main board;

[0020] Figure 4 This is a schematic diagram of the structure on the back of the main board;

[0021] Figure 5 is a schematic diagram of the structure of the radiation unit;

[0022] Figure 6 A schematic diagram showing the results of antenna reflection coefficient detection;

[0023] Figure 7 A schematic diagram showing the results of antenna isolation detection;

[0024] Figure 8 Schematic diagram of antenna reflection coefficient at different positions of the antenna loading direction;

[0025] Fig. 9 A schematic diagram of the antenna reflection coefficient at different positions on the y-axis direction when the antenna is loaded;

[0026] Fig.10 Another schematic diagram of the antenna reflection coefficient at different positions on the y-axis direction when the antenna is loaded.

[0027] Description of reference numerals:

[0028] 1-main board body, 11-radiation unit, 111-first gap, 12-resonance ring, 121-first rectangular ring, 122-second rectangular ring, 13-first floor gap unit, 131-bending structure, 14-second floor gap unit, B-distance between the resonant ring and the long side of the radiation unit, A-distance between the resonant ring and the wide side of the radiation unit.

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if there are descriptions of the first, second, etc. in the embodiments of the present invention, the descriptions of the first, second, etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to the first and second can explicitly or implicitly include at least one of the features. In addition, if the meaning of and / or appears in the full text is to include three parallel schemes, taking A and / or B as an example, it includes scheme A, or scheme B, or a scheme that A and B meet at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The present invention provides a planar miniaturized high-isolation dual-band antenna.

[0034] In the embodiment of the present invention, Figure 1 As shown, the planar miniaturized high-isolation dual-band antenna includes a main board body 1, the upper surface of the main board body 1 is provided with a connected radiation unit 11 and a resonant ring 12, the lower surface of the main board body 1 is provided with a first floor gap unit 13 and a second floor gap unit 14, the radiation unit 11 and the resonant ring 12 are distributed above the first floor gap unit 13, the second floor gap unit 14 is arranged beside the first floor gap unit 13, and the radiation unit 11, the resonant ring 12, the first floor gap unit 13, and the second floor gap unit 14 are all located at the corners of the main board body 1.

[0035] The present invention achieves the effect of saving the volume of the antenna system by arranging a connected radiation unit 11 and a resonant ring 12 on the upper surface of the mainboard body 1 and opening a first floor gap unit 13 and a second floor gap unit 14 on the lower surface of the mainboard body 1. The radiation unit 11 and the resonant ring 12 are distributed and stacked above the first floor gap unit 13 to save volume. Adding the resonant ring 12 on the basis of the radiation unit 11 makes the antenna impedance bandwidth become multi-band, thereby improving the bandwidth of the antenna.

[0036] In this embodiment, the resonant ring 12 includes a first rectangular ring and a second rectangular ring, the opening sizes of the first rectangular ring and the second rectangular ring are equal, the shape of the first rectangular ring is larger than the shape of the second rectangular ring, the second rectangular ring is located on the inner side of the first rectangular ring, and the first rectangular ring and the second rectangular ring are in the same plane.

[0037] To miniaturize the mobile phone antenna so that it can operate normally in a narrow space, the antenna can be miniaturized by bending and folding technology, fractal technology, and the introduction of metamaterial structures. In addition, the terminal antenna with multi-band characteristics can be realized by using multi-patch coplanar or stacking methods, single-patch dual-mode technology, single-patch loading method, or single-patch slotting method. Due to the development of science and technology, the requirements for data transmission rate are getting higher and higher. Because the wide bandwidth increases the channel capacity, the transmission rate is increased while saving production costs. Through the close-range parasitic loading technology, a dipole and a metal strip are placed on the same side of the FR4 dielectric board (dielectric constant is 4.4, the thickness of the dielectric board is 1.6mm). After the metal strip is added, a new resonance point is generated, and as the length of the metal strip changes, the resonance point also changes; in addition, the distance between the metal strip and the dipole is different, which will also produce different bandwidths. Adding a loading on the basis of the original radiation unit 11 makes the antenna impedance bandwidth become multi-band or increases the bandwidth of the designed antenna. Generally speaking, there are three feeding methods: coaxial line feeding, wave port feeding and lumped parameter port feeding.

[0038] This embodiment uses coaxial feeding. The coaxial line has low transmission loss, especially in high-frequency signal transmission. Its structure allows the electrical signal to be transmitted between the inner conductor and the outer conductor, which can effectively avoid signal leakage and ensure the strength and quality of the signal. The outer conductor of the coaxial line plays a good electromagnetic shielding role, which can effectively reduce external electromagnetic interference (EMI) and avoid signal radiation leakage. This is especially important in high-frequency and high-precision applications. The coaxial line usually has a fixed characteristic impedance (such as 50Ω or 75Ω), which enables it to match the impedance with the input and output ports of the device, reduce reflection loss, and thus improve the efficiency of the system. The coaxial line is easy to connect with other radio frequency components (such as antennas, amplifiers, filters, etc.). Due to its standardized interface and structure, it can simplify system design and equipment integration and improve work efficiency. Due to the structural design of the coaxial line (there is an insulating layer between the inner and outer conductors), it can better suppress external electromagnetic interference and avoid signal damage or unstable system operation. The coaxial line can be applied to a variety of different operating frequency ranges (from low frequency to microwave frequency band), and is widely used in broadcasting, communication, radar and other fields, with strong adaptability. The coaxial cable has a compact structure and is easy to wire and install. It is suitable for RF equipment or systems in limited spaces. It is small in size and easy to install.

[0039] The planar miniaturized high-isolation dual-band antenna is a 5G mobile phone antenna. The size of the mainboard body 1 is 140mm*70mm*1mm. A dielectric plate is arranged on the mainboard body 1. The material of the dielectric plate is FR4 material. The dielectric constant of the dielectric plate is 4.4. The thickness of the dielectric plate is 1.6mm. FR4 material is used as the dielectric plate of the antenna. FR4 is a composite material made of epoxy resin and glass fiber cloth through a lamination process and has flame retardant properties.

[0040] In this embodiment, the planar miniaturized high-isolation dual-band antenna has a total of four antenna units, and the four antenna units are placed at the four corners of the planar miniaturized high-isolation dual-band antenna. Each antenna unit is composed of an L-shaped radiation unit 11, a resonant ring 12 loading, and a first tortuous floor gap unit 13 and a second floor gap unit 14. The size of each antenna unit is 16mm*15mm. In order to achieve the effect of antenna miniaturization and high isolation, a new type of composite left-handed and right-handed transmission line new structure antenna is designed using the traditional right-handed transmission line theorem; at the same time, the loading part also adopts a metamaterial structure-complementary open resonant ring 12.

[0041] The resonant ring 12 includes a first rectangular ring 121 and a second rectangular ring 122. The opening sizes of the first rectangular ring 121 and the second rectangular ring 122 are equal. The shape of the first rectangular ring 121 is larger than the shape of the second rectangular ring 122. The second rectangular ring 122 is located inside the first rectangular ring 121. The first rectangular ring 121 and the second rectangular ring 122 are in the same plane. The openings of the first rectangular ring 121 and the second rectangular ring 122 are arranged opposite to each other. The second rectangular ring 122 is placed inside the first rectangular ring 121. The second rectangular ring 122 is arranged parallel to the first rectangular ring 121. The design with openings relative to each other enhances the electromagnetic coupling between the first rectangular ring 121 and the second rectangular ring 122, and helps to efficiently transfer energy between the rings. This structure can select signals of specific frequencies and suppress other frequencies, and is often used in filters. The first rectangular ring 121 and the second rectangular ring 122 placed in parallel can produce resonance, which is used for tuning circuits or antenna design to optimize performance. Placing the second rectangular ring 122 inside the first rectangular ring 121 saves space and is suitable for compact electronic devices. The design with openings relative to each other can also control the radiation direction of electromagnetic waves and improve the performance of equipment such as antennas.

[0042] Through simulation tests, it can be seen that the mobile phone antenna is a dual-band antenna, and the two frequency bands include the 5G communication frequency bands (3.3-3.6GHz and 4.8-5.0GHz), which has low requirements on the PCB design of the motherboard and the layout of the motherboard components.

[0043] The first floor gap unit 13 is provided with a bending structure 131 , the bending structure 131 is in a stepped shape, and the resonant ring 12 is located above the bending structure 131 .

[0044] The stepped bending structure 131 can usually introduce a more complex electromagnetic wave propagation path, thereby adjusting the resonant frequency. Through the design of the bending structure 131, the propagation speed and path of electromagnetic waves in different areas can be controlled, thereby affecting the resonance characteristics, so that the role of the resonant ring 12 is optimized, especially in applications with high frequency or wavelength requirements; the stepped bending structure 131 can enhance the interaction between electromagnetic waves and the structure, so that the coupling between the resonant ring 12 and the first floor gap unit 13 is tighter, and the resonance effect is improved. This coupling effect may lead to a stronger local electric field, thereby improving the performance of the device, such as increasing its bandwidth or improving its selectivity; by setting the stepped bending structure 131, the size of the entire system can be effectively reduced. Adding more electromagnetic components in a certain space makes the device design more compact without affecting its performance. This structural design is very useful in applications with limited space or strict size requirements; the bending structure 131 can sometimes improve impedance matching with other parts, reduce reflections, and improve signal transmission efficiency. In some RF designs, it is very important to optimize impedance matching through a stepped structure to ensure maximum power transmission; the stepped structure can physically change the current distribution, making the surface current distribution more uniform, thereby making the propagation of electromagnetic waves more stable. This can reduce signal attenuation or interference and optimize system performance.

[0045] The first floor gap unit 13 is L-shaped, and the outer right angle of the L-shaped first floor gap unit 13 forms a diagonal with the right angle of the main board body 1. The radiation unit 11 is L-shaped, and the outer right angle of the L-shaped first floor gap unit 13 forms a diagonal with the outer right angle of the L-shaped radiation unit 11. The radiation unit 11 is a metal sheet with a length of 15mm and a width of 6.7mm. The second floor gap unit 14 is T-shaped. According to the relevant principles of the missing ground structure, a tortuous L-shaped and T-shaped gap is opened on the main board body 1 of the antenna to change the current distribution on the main board body 1, so that the current is offset with a part of the original current, thereby achieving the purpose of decoupling and finally achieving a high isolation effect.

[0046] In this embodiment, a first slot 111 is provided on the radiation unit 11, so that an interdigital capacitor is added to the antenna. The interdigital capacitor increases the capacitance between electrodes through the first slot 111, which helps to adjust the impedance matching of the antenna and improve the radiation efficiency. The interdigital capacitor can optimize the input impedance of the antenna, reduce reflection, and enhance the signal transmission efficiency. The introduction of the interdigital capacitor can broaden the working bandwidth of the antenna so that it can maintain good performance in a wider frequency range. The interdigital capacitor forms a resonant structure with other parts of the antenna, improves frequency selectivity, and suppresses interference signals. The interdigital capacitor has a compact structure and helps to miniaturize the antenna, which is suitable for the needs of modern electronic equipment. The interdigital capacitor can improve the radiation pattern and gain of the antenna and enhance the signal coverage and strength. In addition, the L-shaped radiation unit 11 is short-circuited and grounded, which is equivalent to adding an inductor in the circuit, so that the planar miniaturized high-isolation dual-band antenna also meets the characteristics of the left-handed transmission line.

[0047] The L-shaped first floor gap unit 13 is usually used to change the propagation path of the signal or the distribution of the electromagnetic wave. The L-shaped structure can effectively guide or concentrate electromagnetic energy and enhance the radiation or coupling effect. In antenna design, the L-shaped gap is often used to provide multi-path propagation, enhance the coverage and gain of the signal, especially in situations where higher directivity or stronger signal transmission is required. In addition, the L-shaped structure may help adjust or improve the impedance matching of the system and reduce reflection loss.

[0048] The L-shaped radiation unit 11 has good radiation characteristics and can effectively convert electrical energy into electromagnetic waves for radiation. The L-shaped design may help to enhance the radiation efficiency and improve the directivity and gain of the antenna. The inverted L shape can provide a specific radiation pattern and optimize the performance of the operating frequency band to ensure that the device works stably within a predetermined frequency range.

[0049] The radiation element 11 is a metal sheet with a length of 15 mm and a width of 6.7 mm: the given size of the metal sheet (length 15 mm, width 6.7 mm) affects its resonant frequency and the radiation characteristics of the electromagnetic wave. This size determines the operating frequency and bandwidth of the antenna. The size of the metal sheet affects the propagation and radiation characteristics of the electromagnetic wave, and a smaller size usually leads to a higher operating frequency. By optimizing these sizes, the radiation pattern, gain and directivity of the antenna can be controlled.

[0050] The second floor slot unit 14 is T-shaped. The T-shaped structure has high flexibility in the radio frequency circuit, can improve the propagation directionality of the signal, and can improve the matching of the system. In the antenna design, the T-shaped slot unit may be used to adjust the coupling effect between the radiation unit 11 and the floor, optimize the transmission efficiency of the signal, reduce signal reflection, and improve the impedance matching of the system. The T-shaped slot structure may also help improve the bandwidth or frequency response of the antenna.

[0051] The resonant ring 12 is a complementary open resonant ring 12. By using the complementary open resonant ring 12 as a load, the overall antenna does not change in size, and a larger impedance bandwidth is achieved, and the effect is obvious. The complementary open resonant ring 12 of this embodiment is a metamaterial. According to relevant research, the gap between the inner and outer rings is equivalent to a distributed capacitor, that is, it is equivalent to adding a capacitor on the radiation unit 11, so that the impedance bandwidth of the mobile phone antenna is increased, and the purpose of miniaturization of the antenna is finally achieved. Through the two technologies of slotting technology and coupled parasitic method, an interdigital capacitor is opened on the radiation unit 11 of the antenna and a complementary open resonant ring 12 is added next to the radiation unit 11. The interdigital capacitor increases the capacitance of the original radiation unit 11, changes the original current path of the radiation unit 11, and thus increases the effective electrical length; and the complementary open resonant ring 12 increases the impedance bandwidth of the antenna, so that the antenna can cover more frequency bands, thereby achieving the purpose of multi-bandwidth antenna.

[0052] The processed object is measured, and the measurement results are as follows: Figure 6 Shown by: Figure 6 It can be seen that there are some small errors between the actual measurement results and the simulation results of the mobile phone antenna, but the impact on the antenna is not significant. The reasons for the error may be the following: some precision errors in the antenna processing process, electromagnetic environment interference when measuring the actual antenna, and the dielectric board material required for the antenna, etc.

[0053] like Figure 7 As shown in the figure, the isolation of the antenna design has reached below -15dB, achieving the characteristic of high isolation. The two methods of slot technology and ground-deficient structure are used to change the current path of the antenna, so that the new current generated and the original current partially offset each other, thereby achieving the purpose of decoupling.

[0054] In addition, the frequency bands of the planar miniaturized 5G mobile phone antenna include 4800MHz-4900MHz, 3500MHz-3600MHz and 3400MHz-3500MHz. Therefore, the design of the planar miniaturized high-isolation dual-band antenna is universal.

[0055] In this embodiment, the distance between the resonant ring 12 and the long side of the radiation unit 11 is in the range of 0-0.2 mm. The distance between the resonant ring 12 and the wide side of the radiation unit 11 is in the range of 0-2 mm. The first floor gap unit 13 is 16 mm long and 8.8 mm wide. The radiation unit 11 is an L-shaped metal sheet with a length of 15 mm and a width of 6.7 mm.

[0056] The loading position of the open resonant ring 12 of the antenna is parametrically scanned from two aspects: (1) the original position parameter is set to 0 mm, and then other parameters are kept unchanged, and the loading of the resonant ring 12 is changed in the x-axis direction; (2) the original position parameter is set to 0 mm, and then other parameters are kept unchanged, and the loading of the resonant ring 12 is changed in the y-axis direction.

[0057] Set the original position parameter R1 = 0mm, change the position of the original open ring loading on the x-axis, and ensure that other parameters remain unchanged.

[0058] like Figure 8 As shown, the reflection coefficient characteristics of the antenna can be clearly seen from the parameter scanning diagram. As R1 changes from -0.4mm to -0.2mm and from 0mm to 0.2mm, the total impedance bandwidth of the mobile phone antenna less than -10dB will become narrower. When the antenna is at -0.4mm, the high frequency band of the impedance bandwidth decreases from the original 1480MHz to 665MHz, narrowing by 815MHz; when R1 is at -0.2mm, the impedance bandwidth decreases from the original 1480MHz to 1150MHz, narrowing by 330MHz; and when R1 changes to 0.2mm, the total impedance bandwidth becomes narrower due to the great mutual influence between the resonant ring 12 loading and the L-type radiation unit 11. For example, the resonance point of the low frequency band shifted from the original resonance point of 3.43GHz to 3.59GHz, and the resonance depth also changed from the original -28.17dB to -15.30dB, while the impedance bandwidth of -10dB in the high frequency band also narrowed. In order to achieve the best bandwidth effect, the final resonant ring 12 loading position is considered to be 0.1mm away from the long side of the radiation unit 11, and the wide side distance between the resonant ring 12 and the radiation unit 11 is 1.2mm.

[0059] Similarly, by Fig. 9 , Fig.10It can be seen that when the position of the resonant ring 12 loaded in the y-axis direction is changed, the impedance bandwidth reaching -10dB will become smaller. For example, when we keep R5 = 0mm, as R4 increases by 0.2mm from the original 0mm to 0.6mm, a part of the high frequency band of the impedance bandwidth is above -10dB, which does not meet the design requirements, and the impedance bandwidth of the high frequency band is reduced from the original 1480MHz to 1060MHz, which is reduced by 420MHz. It can be seen that when the loading part of the resonant ring 12 deviates more from the radiation unit 11 in the y-axis direction, the impedance bandwidth of the high frequency band of the antenna will become narrower. In addition, when keeping R4 = 0mm, R5 changes from -0.4mm to 0mm, and the impedance bandwidth reaching -10dB in the high frequency band will also become narrower. Therefore, in order to achieve better bandwidth requirements, it is comprehensively considered to determine that the loading position of the resonant ring 12 is 0.1mm away from the long side of the radiation unit 11, and the wide side distance between the resonant ring 12 and the radiation unit 11 is 1.2mm.

[0060] The above description is only the preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications, combinations and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A planar miniaturized high-isolation dual-band antenna, characterized in that: It includes a main board body, the upper surface of which is provided with a connected radiation unit and a resonant ring, the lower surface of which is provided with a first floor gap unit and a second floor gap unit, the radiation unit and the resonant ring are distributed above the first floor gap unit, the second floor gap unit is arranged beside the first floor gap unit, and the radiation unit, the resonant ring, the first floor gap unit and the second floor gap unit are all located at the corners of the main board body.

2. The planar miniaturized high-isolation dual-band antenna according to claim 1, characterized in that: The first floor gap unit is provided with a bending structure, the bending structure is in a stepped shape, and the resonant ring is located above the bending structure.

3. The planar miniaturized high-isolation dual-band antenna according to claim 2, characterized in that: The first floor gap unit is L-shaped, and the outer right angle of the L-shape of the first floor gap unit forms a diagonal with the right angle of the main board body.

4. The planar miniaturized high-isolation dual-band antenna according to claim 1, characterized in that: The radiation unit is L-shaped, and the outer right angle of the L-shape of the first floor gap unit forms a diagonal with the outer right angle of the L-shape of the radiation unit.

5. The planar miniaturized high-isolation dual-band antenna according to claim 4, characterized in that: The radiation unit is a metal sheet with a length of 15 mm and a width of 6.7 mm.

6. The planar miniaturized high-isolation dual-band antenna according to claim 1, characterized in that: The second floor gap unit is T-shaped.

7. The planar miniaturized high-isolation dual-band antenna according to claim 1, characterized in that: The resonant ring includes a first rectangular ring and a second rectangular ring, the opening sizes of the first rectangular ring and the second rectangular ring are equal, the shape of the first rectangular ring is larger than the shape of the second rectangular ring, the second rectangular ring is located on the inner side of the first rectangular ring, and the first rectangular ring and the second rectangular ring are in the same plane.

8. The planar miniaturized high-isolation dual-band antenna according to claim 1, characterized in that: The distance between the resonant ring and the long side of the radiation unit is in the range of 0-0.2 mm.

9. The planar miniaturized high-isolation dual-band antenna according to claim 1, characterized in that: The distance between the resonant ring and the wide side of the radiation unit is in the range of 0-2 mm.

10. The planar miniaturized high-isolation dual-band antenna according to claim 1, characterized in that: The size of the main board body is 140mm*70mm*1mm. A dielectric plate is arranged on the main board body. The material of the dielectric plate is FR4 material. The dielectric constant of the dielectric plate is 4.

4. The thickness of the dielectric plate is 1.6mm.

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