Small-size onboard antenna

Abstract

The utility model provides a small-size onboard antenna, which comprises a main board, the main board is provided with a clearance area and a metal grounding area, the clearance area is provided with a first radiator, a second radiator, a third radiator, a fourth radiator and a fifth radiator, the first radiator is provided with a short-circuit part and a feed-in part, the short-circuit part is arranged at the lower end of the first radiator, and the feed-in part is arranged at the lower end of the fifth radiator. The feed-in part is arranged on the upper side of the short circuit part and is electrically connected with a feed-in structure arranged in the metal grounding area, and the first radiator, the second radiator, the third radiator, the fourth radiator and the fifth radiator are sequentially connected to form a main radiator. The beneficial effects of the utility model lie in that the small-size onboard antenna which effectively utilizes the limited mainboard space is provided, and the size of the antenna is reduced as much as possible under the condition that the radio frequency performance is optimized, so that the overall size of the product is reduced, the customer cost is reduced, the user experience is improved, and the product competitiveness is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to antenna technical field especially is a kind of small size on-board antenna. BACKGROUND

[0002] With the popularity of wifi network, more and more products are attached with wireless network function, and wifi antenna is indispensable. In the prior art, ceramic antenna, FPC antenna, shell fragment antenna are generally used as wifi antenna, but these antennas have some deficiencies, such as independent accessory needs additional cost, and large volume needs additional space for installation, which cannot meet the structure requirements of product miniaturization, so the prior art needs to be improved. UTILITY MODEL CONTENT

[0003] The utility model solves the technical problem that: provide a small size on-board antenna with small volume, high integration and good performance.

[0004] In order to solve the above technical problem, the utility model adopts the technical scheme that: a small size on-board antenna, including mainboard, the mainboard is equipped with clearance area and metal connection area, the clearance area is equipped with first radiator, second radiator, third radiator, fourth radiator and fifth radiator, the first radiator is equipped with short-circuit part and feed-in part, the short-circuit part is arranged at the lower end of first radiator, the feed-in part is arranged on the upper side of the short-circuit part and is electrically connected with the feed-in structure arranged in the metal connection area, the upper end of the first radiator is connected with the right end of the second radiator, the left end of the second radiator is connected with the lower end of the third radiator, the upper end of the third radiator is connected with the left end of the fourth radiator, the right end of the fourth radiator is connected with the upper end of the fifth radiator.

[0005] Further, the first radiator is provided with a slit, and the slit extends upward from the side of the short-circuit part close to the feed-in part.

[0006] Further, the length of the slit along the length direction of the first radiator is 1.8mm, and the width of the slit along the length direction of the first radiator is 0.15mm.

[0007] Further, the fifth radiator is provided with an extension part, and the lower end of the extension part is connected with an extension part radiator.

[0008] Further, the extension part radiator is composed of a narrow branch and a wide branch, the upper end of the narrow branch is connected with the extension part, and the wide branch is connected to the lower end of the narrow branch and is perpendicular to the narrow branch.

[0009] Further, the extension part is connected with the extension part radiator in a staggered manner, and the extension part radiator is provided with a translation amount to the right side.

[0010] Further, the feeding structure comprises an impedance adjusting circuit.

[0011] Further, the impedance adjusting circuit comprises a first impedance device, a series impedance device and a second ground impedance device.

[0012] Further, the distance from the second radiator to the nearest metal area is 0.14-0.64mm.

[0013] Further, the distance from the third radiator to the nearest metal area is 0.14-0.64mm.

[0014] The small-size onboard antenna effectively utilizes limited mainboard space, reduces the size of the antenna as much as possible under the condition of optimizing radio frequency performance, thereby reducing the overall size of the product, reducing customer cost, improving user experience, and improving product competitiveness. BRIEF DESCRIPTION OF DRAWINGS

[0015] The specific structure of the utility model will be described in detail below in combination with the drawings:

[0016] Figure 1 The small-size onboard antenna of the embodiment of the utility model is a whole structure schematic view;

[0017] Figure 2 The small-size onboard antenna of the embodiment of the utility model is a whole structure schematic view; Figure 1 The partial structure schematic view of the middle A;

[0018] Figure 3 The small-size onboard antenna of the embodiment of the utility model is a whole structure schematic view;

[0019] Figure 4 The small-size onboard antenna of the embodiment of the utility model is a whole structure schematic view; Figure 3 The partial structure schematic view of the middle B;

[0020] Figure 5 The VSWR index test diagram of the small-size onboard antenna of the embodiment of the utility model is shown in the figure;

[0021] Figure 6 The RL index test diagram of the small-size onboard antenna of the embodiment of the utility model is shown in the figure;

[0022] Figure 7 The Smith Chart index test diagram of the small-size onboard antenna of the embodiment of the utility model is shown in the figure;

[0023] Figure 8 The Radiation Efficiency (%) index test diagram of the small-size onboard antenna of the embodiment of the utility model is shown in the figure;

[0024] Figure 9 Radiation Efficiency (dB) index test diagram of the small-size on-board antenna of an embodiment of the present application;

[0025] Figure 10 Peak Gain (dB) index test diagram of the small-size on-board antenna of an embodiment of the present application;

[0026] 10 - mainboard; 11 - clearance; 12 - metal grounding area; 13 - impedance adjustment circuit;

[0027] 20 - first radiator; 21 - short-circuit part; 22 - feed-in part; 23 - slot;

[0028] 30 - second radiator;

[0029] 40 - third radiator;

[0030] 50 - fourth radiator;

[0031] 60 - fifth radiator; 61 - extension part; 62 - extension radiator; 621 - narrow branch; 622 - wide branch. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0035] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0038] Example

[0039] See also Figures 1 to 4The embodiment provides a small-size on-board antenna, which comprises a main board 10, the main board 10 is provided with a clearance area 11 and a metal grounding area 12, the clearance area 11 is provided with a first radiator 20, a second radiator 30, a third radiator 40, a fourth radiator 50 and a fifth radiator 60, the first radiator 20 is provided with a short-circuit part 21 and a feeding part 22, the short-circuit part 21 is arranged at the lower end of the first radiator 20, the feeding part 22 is arranged at the upper side of the short-circuit part 21 and is electrically connected with a feeding structure arranged in the metal grounding area 12, the upper end of the first radiator 20 is connected with the right end of the second radiator 30, the left end of the second radiator 30 is connected with the lower end of the third radiator 40, the upper end of the third radiator 40 is connected with the left end of the fourth radiator 50, and the right end of the fourth radiator 50 is connected with the upper end of the fifth radiator 60.

[0040] In the embodiment, the antenna comprises a main board 10, the length of the main board 10 is 30 mm, the width of the main board 10 is 20 mm, a clearance area 11 is arranged at a corner of the main board 10, for the convenience of description, the length direction of the main board is defined as the left-right direction, the width direction of the main board is defined as the up-down direction, the clearance area 11 is composed of a first clearance area and a second clearance area, both the first clearance area and the second clearance area are rectangular clearance areas, wherein the first clearance area and the second clearance area are perpendicular to each other to form an "L" shaped clearance area, and the first clearance area is located at the right lower corner of the second clearance area.

[0041] The first radiator 20, the second radiator 30, the third radiator 40, the fourth radiator 50 and the fifth radiator 60 are sequentially arranged in the clearance area 11, wherein the lower end of the first radiator 20 is arranged in the first clearance area, the upper end of the first radiator 20 is arranged in the second clearance area, and the second radiator 30, the third radiator 40, the fourth radiator 50 and the fifth radiator 60 are all arranged in the second clearance area.

[0042] The first radiator 20 is provided with a short-circuit part 21 and a feeding part 22, the first radiator 20 is arranged in the up-down direction, the short-circuit part 21 is located at the left side of the lower end of the first radiator 20, the short-circuit part 21 extends to the left and is electrically connected with the metal grounding area 12, the feeding part 22 is arranged at the upper side of the short-circuit part 21, the feeding part 22 extends to the left and is electrically connected with the feeding structure arranged in the metal grounding area 12, and the minimum distance between the feeding part 22 and the short-circuit part 21 is 0.5 mm. The second radiator 30 is arranged in the left-right direction, the upper end of the first radiator 20 is connected with the right end of the second radiator 30, the third radiator 40 is arranged in the up-down direction, the left end of the second radiator 30 is connected with the lower end of the third radiator 40, the fourth radiator 50 is arranged in the left-right direction, the upper end of the third radiator 40 is connected with the left end of the fourth radiator 50, the fifth radiator 60 is arranged in the up-down direction, and the right end of the fourth radiator 50 is connected with the upper end of the fifth radiator 60.

[0043] The length of the first radiator 20 is 2.15-2.3 mm, and the width is 1-1.1 mm; the length of the second radiator 30 is 5.6-5.8 mm, and the width is 0.45-0.55 mm; the length of the third radiator 40 is 3.7-3.9 mm, and the width is 0.55-0.65 mm; the length of the fourth radiator 50 is 7.75-7.85 mm, and the width is 0.35-0.45 mm; and the length of the fifth radiator 60 is 1.36-1.37 mm, and the width is 0.7-0.8 mm.

[0044] By means of the main radiators composed of the first radiator 20, the second radiator 30, the third radiator 40, the fourth radiator 50 and the fifth radiator 60, the metal grounding area 12 is taken as a coupling radiator and as a component of the antenna, and under the joint action of the clearance area 11 of the main plate 10 and the main radiators, the antenna can work in the frequency bands of 2400-2500 MHz and 5150-5850 MHz, and has good radio frequency performance indexes.

[0045] As a preferred embodiment of the present application, the first radiator 20 is provided with a gap 23, which extends upward from the side of the short-circuit part 21 close to the feed-in part 22.

[0046] In the implementation, the gap 23 is arranged in the first radiator 20 and extends upward from the upper side of the short-circuit part 21. The length of the gap 23 along the length direction of the first radiator 20 is 1.8 mm, and the width of the gap 23 along the length direction of the first radiator 20 is 0.15 mm. By arranging the gap 23 in the first radiator 20, the resonance frequency and impedance matching can be improved, the radiation efficiency is increased, and thus the radio frequency indexes of the antenna in the working frequency band are improved.

[0047] As a preferred embodiment of the present application, the fifth radiator 60 is provided with an extension part 61, and an extension radiator is connected to the lower end of the extension part.

[0048] In the implementation, the downward extension part 61 is arranged at the lower end of the fifth radiator 60, the extension part 61 extends from the second clearance area to the first clearance area, and the extension radiator 62 is arranged at the lower end of the extension part 61, so that the resonance frequency of the antenna is improved, and the radio frequency indexes of the antenna in the working frequency band are optimized. The length of the extension part 61 along the width direction of the main plate is 3.85-3.95 mm, and the width of the extension part 61 along the width direction of the main plate is 0.7-0.8 mm.

[0049] As a preferred embodiment of the present application, the extension radiator 62 is composed of a narrow branch 621 and a wide branch 622, the upper end of the narrow branch 621 is connected with the extension 61, and the wide branch 622 is connected with the lower end of the narrow branch 621 and is perpendicular to the narrow branch 621.

[0050] In a specific embodiment, the extension radiator 62 is set as a radiator composed of a narrow branch 621 and a wide branch 622, the upper end of the narrow branch 621 is connected with the lower end of the extension 61, the lower end of the narrow branch 621 is connected with the right end of the wide branch 622, and the wide branch 622 is perpendicular to the narrow branch 621, forming an L-shaped extension radiator 62, wherein the wide branch 622 extends to the left side.

[0051] The length of the narrow branch 621 along the main plate width direction is 2.9-2.95 mm, and the width of the narrow branch 621 along the main plate width direction is 0.35-0.36 mm.

[0052] The length of the wide branch 622 along the main plate width direction is 0.95-1.05 mm, the width of the wide branch 622 along the main plate width direction is 2.35-2.36 mm, and the shortest distance between the wide branch 622 and the short-circuit part 21 of the first radiator 20 is 0.53 mm.

[0053] By setting the extension radiator 62 on the extension 61, the radio frequency index of the antenna in the working frequency range can be improved, and the radio frequency index meets the design requirements.

[0054] As a preferred embodiment of the present application, the extension 61 is connected with the extension radiator 62 in a staggered manner, and the extension radiator 62 is set to have a translation amount to the right side.

[0055] In a specific embodiment, in order to obtain more optimized radio frequency index, the extension radiator 62 is set in a staggered manner with the extension 61, and the extension radiator 62 is translated by a distance to the right side, and the translation amount is 0.10-0.12 mm.

[0056] By translating the extension radiator 62 by a distance to the right side, the radio frequency index of the antenna in the working frequency range can be optimized.

[0057] As a preferred embodiment of the present application, the feed structure includes an impedance adjustment circuit 13.

[0058] In a specific embodiment, by setting the impedance adjustment circuit 13 on the feed structure, the impedance of the antenna can be conveniently adjusted to improve the standing wave performance of the antenna. The impedance adjustment circuit 13 is preferably a π-shaped circuit.

[0059] As a preferred embodiment of the present application, the impedance adjustment circuit 13 includes a first ground resistance, a coupling capacitor and a second ground resistance.

[0060] In the embodiment, the impedance adjusting circuit 13 comprises a first impedance device, a series impedance device and a second ground impedance device.

[0061] As a preferred embodiment of the present embodiment, the distance from the second radiator 30 to the nearest metal grounding area 12 is 0.14-0.64mm.

[0062] In the embodiment, the distance from the second radiator 30 to the nearest metal grounding area 12 is limited to 0.14-0.64mm, which can ensure the coupling radiation performance of the second radiator 30 and the metal grounding area 12, and further ensure the RF performance of the whole antenna.

[0063] As a preferred embodiment of the present embodiment, the distance from the third radiator 40 to the nearest metal grounding area 12 is 0.14-0.64mm.

[0064] In the embodiment, the distance from the third radiator 40 to the nearest metal grounding area 12 is limited to 0.14-0.64mm, which can ensure the coupling radiation performance of the third radiator 40 and the metal grounding area 12, and further ensure the RF performance of the whole antenna.

[0065] Please refer to Figures 5 to 10 The small-size onboard antenna provided by the present embodiment can have good RF performance indexes in the frequency bands of 2400MHz-2500MHz and 5150MHz-5850MHz.

[0066] As can be seen from the above description, the present application has the advantages that: the small-size onboard antenna effectively utilizes the limited mainboard space, optimizes the RF performance, and further reduces the size of the antenna, the overall size of the product, the cost of customers, and the user experience, and improves the product competitiveness.

[0067] It is easy for those skilled in the art to understand that the above-mentioned embodiments can be freely combined and superimposed without conflict.

[0068] The above description is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection range of the present application.

Claims

1. A small size on-board antenna, characterized by: The main board is provided with a clearance area and a metal grounding area, the clearance area is provided with a first radiator, a second radiator, a third radiator, a fourth radiator and a fifth radiator, the first radiator is provided with a short circuit part and a feed-in part, the short circuit part is arranged at the lower end of the first radiator, the feed-in part is arranged at the upper side of the short circuit part and is electrically connected with the feed-in structure arranged in the metal grounding area, the upper end of the first radiator is connected with the right end of the second radiator, the left end of the second radiator is connected with the lower end of the third radiator, the upper end of the third radiator is connected with the left end of the fourth radiator, and the right end of the fourth radiator is connected with the upper end of the fifth radiator.

2. The small size on-board antenna according to claim 1, characterized in that: The first radiator is provided with a gap, and the gap extends upward from the side of the short circuit part close to the feed-in part.

3. The small size on-board antenna according to claim 2, characterized in that: The length of the gap along the length direction of the first radiator is 1.8 mm, and the width of the gap along the length direction of the first radiator is 0.15 mm.

4. The small size on-board antenna according to claim 1, characterized in that: The fifth radiator is provided with an extension part, and the lower end of the extension part is connected with an extension radiator.

5. The small size on-board antenna according to claim 4, characterized in that: The extension radiator is composed of a narrow branch and a wide branch, the upper end of the narrow branch is connected with the extension part, and the wide branch is connected to the lower end of the narrow branch and is perpendicular to the narrow branch.

6. The small size on-board antenna according to claim 5, characterized in that: The extension part is connected with the extension radiator in a staggered manner, and the extension radiator is provided with a translation amount to the right side.

7. The small size on-board antenna according to claim 1, characterized in that: The feed-in structure comprises an impedance adjusting circuit.

8. The small size on-board antenna according to claim 7, characterized in that: The impedance adjusting circuit comprises a first impedance device, a series impedance device and a second ground impedance device.

9. The small size on-board antenna according to claim 1, characterized in that: The distance from the second radiator to the nearest metal grounding area is 0.14-0.64 mm.

10. The small size on-board antenna according to claim 1, characterized in that: The distance from the third radiator to the nearest metal grounding area is 0.14-0.64 mm.

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