Miniaturized multi-band antenna and electronic device

Abstract

The present invention discloses a miniaturized multi-band antenna and electronic equipment. The miniaturized multi-band antenna includes a dielectric substrate, a main radiating branch, a coupling branch and a C-type branch. The main radiating branch is arranged on the dielectric substrate and operates in a first frequency band. The coupling branch forms a distributed capacitance with the main radiating branch to optimize the impedance matching of the main radiating branch in the first frequency band. The C-type branch operates in a second frequency band, is connected to the main radiating branch, and performs impedance matching with the main radiating branch to optimize the radiation performance of the antenna in the second frequency band. The present invention is used to solve the technical problem that the existing antenna system needs to use two antennas to realize the two working frequency bands of WiFi and Bluetooth.

Description

Technical Field

[0001] The present invention relates to the technical field of signal transmission, and in particular to a miniaturized multi-band antenna and electronic equipment. Background Art

[0002] At present, Bluetooth technology and WiFi technology are becoming more and more mature. When electronic devices transmit signals, the antenna is used to convert electromagnetic waves to achieve signal transmission and reception. Since the working frequency band of the antenna is relatively single and the antenna is only optimized for a certain frequency band during design, the antenna designed specifically can work in the optimized frequency band and the transmission efficiency of the antenna is the best.

[0003] In the prior art, many products and devices can simultaneously support Bluetooth connection mode and WiFi connection mode for data transmission. In order to fully ensure the transmission efficiency of the antenna, the WiFi system and Bluetooth system of the existing electronic equipment are implemented with two independent antennas to convert electromagnetic waves. However, due to the influence of isolation, etc., the antenna system that supports both Bluetooth connection mode and WiFi connection mode will be relatively large. Summary of the invention

[0004] The main purpose of the present invention is to provide a miniaturized multi-band antenna, aiming to solve the technical problem that the existing antenna system has a large volume when working in two different working frequency bands at the same time.

[0005] To achieve the above object, the present invention provides a miniaturized multi-band antenna, the miniaturized multi-band antenna comprising:

[0006] dielectric substrate;

[0007] The main radiation branch is arranged on the dielectric substrate and operates in the first frequency band;

[0008] A coupling branch, forming a distributed capacitance with the main radiation branch to optimize the impedance matching of the main radiation branch in the first frequency band;

[0009] The C-type branch works in the second frequency band, is connected to the main radiation branch, and performs impedance matching with the main radiation branch to optimize the radiation performance of the antenna in the second frequency band.

[0010] Optionally, the dielectric substrate includes a clearance area, and the main radiation branch, the coupling branch and the C-shaped branch are all arranged in the clearance area.

[0011] Optionally, the miniaturized multi-band antenna further includes a gradient impedance microstrip feed line and a metal ground, the clearance area and the metal ground are adjacently arranged, the gradient impedance microstrip feed line is electrically connected to the main radiation branch, and the gradient impedance microstrip feed line is arranged on the metal ground.

[0012] Optionally, the length of the dielectric substrate is 18 mm, the width of the dielectric substrate is 18.9 mm, and the thickness of the dielectric substrate is 1.53 mm.

[0013] Optionally, the main radiation branch includes a U-shaped segment and an L-shaped segment, the coupling branch is arranged in the middle of the U-shaped segment, forming an E-shaped segment with the U-shaped segment, and the coupling branch is arranged at a position at 1 / 4 wavelength of the second frequency band in the middle of the U-shaped segment.

[0014] Optionally, the C-shaped branch includes a first segment, a second segment and a third segment connected in sequence, the length of the first segment is 3.15 mm, and the width of the first segment is 0.9 mm; the length of the second segment is 6 mm-8 mm, and the width of the second segment is 0.9 mm; the length of the third segment is 4 mm, and the width of the third segment is 0.9 mm.

[0015] Optionally, the U-shaped segment includes a fourth segment, a fifth segment and a sixth segment connected in sequence; the length of the fourth segment is 9 mm, and the width of the fourth segment is 1.8 mm; the length of the fifth segment is 6.5 mm, and the width of the fifth segment is 1.8 mm; the length of the sixth segment is 7.2 mm, and the width of the sixth segment is 1.8 mm.

[0016] Optionally, the L-shaped segment includes a seventh segment and an eighth segment connected in sequence; the length of the seventh segment is 5.85 mm, and the width of the seventh segment is 1.8 mm; the length of the seventh segment is 9 mm, and the width of the seventh segment is 1.8 mm.

[0017] Optionally, the length of the coupling branch is 6 mm-8 mm, and the width of the coupling branch is 0.9 mm.

[0018] To achieve the above object, the present invention further provides an electronic device, comprising the miniaturized multi-band antenna as described above.

[0019] The present invention provides a miniaturized multi-band antenna with a dielectric substrate, a main radiating branch, a coupling branch and a C-shaped branch, wherein the main radiating branch is provided on the dielectric substrate and operates in a first frequency band, the coupling branch forms a distributed capacitance with the main radiating branch to optimize the impedance matching of the main radiating branch in the first frequency band, the C-shaped branch operates in a second frequency band, is connected to the main radiating branch, and performs impedance matching with the main radiating branch to optimize the radiation performance of the antenna in the second frequency band, so that only one antenna is used, the area occupied by the antenna is reduced, and the antenna is provided with different branches to realize that the antenna works in two frequency bands at the same time, and the antenna impedance is effectively improved. The above scheme utilizes the joint action of multi-branch antennas, synergistically couples to form resonance at high and low frequency points, and creatively uses C-shaped branches for impedance adjustment. At the same time, based on the structural advantages of the antenna radiator, different distributed capacitances are formed on the main radiating surface formed by the coupling branch and the main radiating branch, effectively improving the antenna impedance, and realizing the radiation performance of the antenna on the basis of ensuring miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 It is a schematic structural diagram of the miniaturized multi-band antenna of the present invention;

[0022] Figure 2 It is a schematic diagram of simulation results of the miniaturized multi-band antenna of the present invention.

[0023] 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

[0024] 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.

[0025] 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.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] The present invention provides a miniaturized multi-band antenna, which is used to solve the technical problem of limited driving capability of existing driving chips.

[0028] In one embodiment, if Figure 1 As shown, a miniaturized multi-band antenna is proposed, which is provided with a dielectric substrate, a main radiating branch 30, a coupling branch 40 and a C-shaped branch 50, wherein the main radiating branch 30 is provided on the dielectric substrate and operates in a first frequency band, the coupling branch 40 and the main radiating branch 30 form a distributed capacitance to optimize the impedance matching of the main radiating branch 30 in the first frequency band, and the C-shaped branch 50 operates in a second frequency band, is connected to the main radiating branch 30, and performs impedance matching with the main radiating branch 30 to optimize the radiation performance of the antenna in the second frequency band, so that only one antenna is used, the area occupied by the antenna is reduced, and the antenna is provided with different branches to realize that the antenna works in two frequency bands at the same time, and the antenna impedance is effectively improved. The above scheme utilizes the joint action of multi-branch antennas, synergistically couples to form resonance at high and low frequency points, and creatively uses C-shaped branches for impedance adjustment. At the same time, based on the structural advantages of the antenna radiator, the main radiating surface formed by the coupling branch 40 and the main radiating branch 30 is used to form different distributed capacitances, effectively improve the antenna impedance, and can achieve the radiation performance of the antenna on the basis of ensuring miniaturization. In addition, the antenna radiation surface has a simple structure, which reduces processing errors in subsequent production processes and is easy to mass produce.

[0029] In one embodiment, the dielectric substrate includes a clearance area 10, and the main radiation branch 30, the coupling branch 40 and the C-shaped branch 50 are all arranged in the clearance area 10. At this time, the main radiation branch 30, the coupling branch 40 and the C-shaped branch 50 can be kept away from other metal objects to achieve metal shielding and eliminate interference.

[0030] In one embodiment, the miniaturized multi-band antenna further includes a gradient impedance microstrip feeder and a metal ground 20, the clearance area 10 and the metal ground 20 are adjacently arranged, the gradient impedance microstrip feeder is electrically connected to the main radiation branch 30, and the gradient impedance microstrip feeder is arranged on the metal ground 20. Among them, the gradient impedance microstrip feeder structure further improves the impedance matching of the antenna, optimizes the radiation performance of the antenna, and further improves the transmission efficiency of the antenna, and the antenna can work in the Bluetooth and WiFi working frequency bands at the same time.

[0031] In one embodiment, the length of the dielectric substrate is 18 mm, the width of the dielectric substrate is 18.9 mm, and the thickness of the dielectric substrate is 1.53 mm.

[0032] Among them, when the length of the dielectric substrate is 18mm and the width of the dielectric substrate is 18.9mm, the miniaturized multi-band antenna can work better in the Bluetooth band (2.4Ghz) and the WIFI band (5.8Ghz), making the division of the antenna near field and far field clear, making it more convenient to perform simulation and structural design.

[0033] In one embodiment, the main radiation branch 30 includes a U-shaped segment and an L-shaped segment. A coupling branch 40 is arranged in the middle of the U-shaped segment to form an E-shaped segment with the U-shaped segment. The coupling branch 40 is arranged at a position at 1 / 4 wavelength of the second frequency band in the middle of the U-shaped segment.

[0034] Among them, the main radiation branch 30 is the main radiator, with a length of 22.55mm, which is generally calculated based on the average value of 1 / 4 wavelength of Bluetooth and WIFI frequency bands, with a reference range of 15mm to 30mm. The main radiation branch 30 mainly works in the Bluetooth frequency band (2.4Ghz). The length and position of the main radiation branch 30 mainly affect the low-frequency radiation (2.4Ghz). In addition, adding a C-type branch 50 at the corresponding position of the main radiation branch 30 relative to the 1 / 4 wavelength of the high-frequency radiation band (5.8Ghz) can improve the impedance matching of the high-frequency radiation band and improve the antenna performance.

[0035] In one embodiment, the C-shaped branch 50 includes a first section, a second section and a third section connected in sequence, the length of the first section is 3.15 mm, and the width of the first section is 0.9 mm; the length of the second section is 6 mm-8 mm, and the width of the second section is 0.9 mm; the length of the third section is 4 mm, and the width of the third section is 0.9 mm.

[0036] Among them, by setting the C-type branch 50 structure, the coupling between the end of the main radiation branch 30 and the floor can be enhanced. By adjusting the length and width of the C-type branch 50, the size of the distributed capacitance is optimized, and then the radiation performance of the antenna in the high frequency band is optimized. When the length of the first section is 3.15mm and the width of the first section is 0.9mm; the length of the second section is 6mm-8mm and the width of the second section is 0.9mm; the length of the third section is 4mm and the width of the third section is 0.9mm, the optimization of the WIFI frequency band of the antenna is most effective, and when the length of the second section is 6.5mm, the impedance optimization effect is best.

[0037] In one embodiment, the U-shaped segment includes a fourth segment, a fifth segment and a sixth segment connected in sequence; the length of the fourth segment is 9 mm, and the width of the fourth segment is 1.8 mm; the length of the fifth segment is 6.5 mm, and the width of the fifth segment is 1.8 mm; the length of the sixth segment is 7.2 mm, and the width of the sixth segment is 1.8 mm.

[0038] In the above embodiment, the U-shaped segment and the coupling branch 40 form different distributed capacitances, which can achieve better impedance optimization. When the corresponding values ​​in the above embodiment are selected, the optimized impedance performance is the best.

[0039] In one embodiment, the L-shaped segment includes a seventh segment and an eighth segment connected in sequence; the length of the seventh segment is 5.85 mm, and the width of the seventh segment is 1.8 mm; the length of the seventh segment is 9 mm, and the width of the seventh segment is 1.8 mm.

[0040] In the above embodiment, the L-shaped segment and the coupling branch 40 form different distributed capacitances, which can achieve better impedance optimization. When the corresponding values ​​in the above embodiment are selected, the optimized impedance performance is the best.

[0041] In one embodiment, the length of the coupling branch 40 is 6 mm-8 mm, and the width of the coupling branch 40 is 0.9 mm.

[0042] The coupling branch 40 has the function of impedance optimization in both the Bluetooth frequency band and the WIFI frequency band, and the optimization in the WIFI frequency band is the most effective. The reference range of the length thereof is 6 mm to 8 mm, with 6.75 mm being the optimum.

[0043] In summary, after simulating the antenna, Figure 2 As shown in the figure, its transmission efficiency is the best in the Bluetooth band and the WIFI band. On the basis of miniaturization, the radiation performance of the antenna is optimized so that the antenna can work in the Bluetooth and WiFi working bands at the same time, and the transmission efficiency of the antenna is guaranteed to be at the industry level and will not be reduced, and even better than the industry level in the WiFi working band.

[0044] In order to solve the above problem, the present invention further provides an electronic device, comprising the miniaturized multi-band antenna as above.

[0045] It is worth noting that, because the electronic device of the present invention includes all embodiments of the above-mentioned miniaturized multi-band antenna, the electronic device of the present invention has all the beneficial effects of the above-mentioned miniaturized multi-band antenna, which will not be described in detail here.

[0046] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A miniaturized multi-band antenna, characterized in that: The miniaturized multi-band antenna comprises: dielectric substrate; The main radiation branch is arranged on the dielectric substrate and operates in the first frequency band; A coupling branch, forming a distributed capacitance with the main radiation branch to optimize the impedance matching of the main radiation branch in the first frequency band; A C-type branch node, which works in the second frequency band, is connected to the main radiation branch node, and performs impedance matching with the main radiation branch node to optimize the radiation performance of the antenna in the second frequency band, wherein the size of the distributed capacitance is optimized by adjusting the length and width of the C-type branch node; The main radiation branch includes a U-shaped segment and an L-shaped segment. The coupling branch is arranged in the middle of the U-shaped segment to form an E-shaped segment with the U-shaped segment. The coupling branch is arranged at a position at 1 / 4 wavelength of the second frequency band in the middle of the U-shaped segment.

2. The miniaturized multi-band antenna according to claim 1, wherein: The dielectric substrate comprises a clearance area, and the main radiation branch, the coupling branch and the C-shaped branch are all arranged in the clearance area.

3. The miniaturized multi-band antenna according to claim 2, wherein: The miniaturized multi-band antenna also includes a gradient impedance microstrip feeder and a metal ground. The clearance area and the metal ground are adjacently arranged. The gradient impedance microstrip feeder is electrically connected to the main radiation branch. The gradient impedance microstrip feeder is arranged on the metal ground.

4. The miniaturized multi-band antenna according to claim 3, wherein: The length of the dielectric substrate is 18 mm, the width of the dielectric substrate is 18.9 mm, and the thickness of the dielectric substrate is 1.53 mm.

5. The miniaturized multi-band antenna according to claim 3, wherein: The C-shaped branch includes a first section, a second section and a third section connected in sequence, the length of the first section is 3.15mm, and the width of the first section is 0.9mm; the length of the second section is 6mm-8mm, and the width of the second section is 0.9mm; the length of the third section is 4mm, and the width of the third section is 0.9mm.

6. The miniaturized multi-band antenna according to claim 1, wherein: The U-shaped segment includes a fourth segment, a fifth segment and a sixth segment connected in sequence; the length of the fourth segment is 9 mm, and the width of the fourth segment is 1.8 mm; the length of the fifth segment is 6.5 mm, and the width of the fifth segment is 1.8 mm; the length of the sixth segment is 7.2 mm, and the width of the sixth segment is 1.8 mm.

7. The miniaturized multi-band antenna according to claim 1, wherein: The L-shaped segment includes a seventh segment and an eighth segment connected in sequence; the length of the seventh segment is 5.85 mm, and the width of the seventh segment is 1.8 mm; the length of the seventh segment is 9 mm, and the width of the seventh segment is 1.8 mm.

8. The miniaturized multi-band antenna according to claim 1, wherein: The length of the coupling branch is 6mm-8mm, and the width of the coupling branch is 0.9mm.

9. An electronic device, characterized in that: It comprises the miniaturized multi-band antenna as claimed in any one of claims 1 to 8.

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