Tri-band antenna

Abstract

A three-band antenna is provided on a substrate, the substrate having a first surface and a second surface opposite to the first surface, and characterized in that it comprises: a grounding layer provided on the first surface of the substrate; a short-circuit strip line provided on the second surface of the substrate, one end of the short-circuit strip line being electrically connected to the grounding layer through a through hole; a direct feeding strip line provided on the second surface of the substrate, one end of the direct feeding line being a feeding point, and the short-circuit strip line semi-enclosing the direct feeding line. The three-band antenna designed by the present invention supports multiple frequency bands while meeting the small size requirement.

Description

Technical Field

[0001] The present invention relates to the field of antennas, and in particular to a triple-band antenna. Background Art

[0002] With the rapid development of wireless communication, people's requirements for wireless communication are getting higher and higher. Existing wireless communication devices often have to have multiple antennas built in to support various communication functions. Currently, the antennas used for mobile communications on the market basically only support frequency bands below 3GHz, and some antennas use lumped components to cover 700MHz in a small size, which increases antenna loss and reduces gain. Summary of the invention

[0003] In view of this, it is necessary to provide a tri-band antenna that supports multiple frequency bands while meeting the small size requirement.

[0004] An embodiment of the present invention provides a tri-band antenna, which is disposed on a substrate, wherein the substrate has a first surface and a second surface opposite to the first surface, and is characterized by comprising:

[0005] A ground layer, disposed on the first surface of the substrate;

[0006] A short-circuit strip line is arranged on the second surface of the substrate, and one end of the short-circuit strip line is electrically connected to the ground layer through a through hole;

[0007] The direct feeding strip line is arranged on the second surface of the substrate, one end of the direct feeding strip line is a feeding point, and the short-circuit strip line half surrounds the direct feeding strip line.

[0008] Preferably,

[0009] The first microstrip line is in the shape of a "ㄈ", with one end suspended;

[0010] A second microstrip line is in a "Π" shape, one end of which is electrically connected to the other end of the first microstrip line, and the other end of which is the feeding point;

[0011] The third microstrip line is in a mirror image "ㄈ" shape, one end of which is electrically connected to the other end of the second microstrip line, and the upper end is suspended.

[0012] The short-circuit strip line comprises:

[0013] The fourth microstrip line is in the shape of a long strip and has the through hole at one end;

[0014] a fifth microstrip line, in a mirror image "ㄈ" shape, one end of which is electrically connected to the other end of the fourth microstrip line;

[0015] The sixth microstrip line is in an "L" shape, one end of which is electrically connected to the other end of the fifth microstrip line, and the right end is suspended.

[0016] Preferably, a gap between the fifth microstrip line and the sixth microstrip line is smaller than widths of the fifth microstrip line and the sixth microstrip line.

[0017] Preferably, the sixth microstrip line semi-surrounds the direct-feed strip line.

[0018] Preferably, the direct feeding strip line and the short-circuit strip line are arranged above the substrate, and the ground layer is arranged below the substrate.

[0019] Preferably, projections of the direct feeding strip line and the short-circuit strip line on the first surface do not overlap with the ground layer.

[0020] Compared with the prior art, the three-band antenna provided in the embodiment of the present invention adopts a multi-segment coupling method to ensure the small size and ultra-wideband of the antenna without loading lumped components. It can not only cover most of the 2G, 3G, and 4G frequency bands, but also support the 3.3GHz to 3.6GHz frequency bands used by 5G. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of an embodiment of a triple-band antenna of the present invention.

[0022] Figure 2 This is the 2G radiation diagram of the tri-band antenna of the present invention working at 0.72G.

[0023] Figure 3 This is the 2G radiation diagram of the tri-band antenna of the present invention working at 1.74G.

[0024] Figure 4 This is the 2G radiation diagram of the tri-band antenna of the present invention working at 2.13G.

[0025] Figure 5 This is the 2G radiation diagram of the tri-band antenna of the present invention working at 3.57G.

[0026] Figure 6 Schematic diagram of antenna efficiency of the triple-band antenna of the present invention.

[0027] Main component symbols

[0028] Tri-band antenna 1

[0029] Substrate 10

[0030] The first surface 11 of the substrate

[0031] The second surface 12 of the substrate

[0032] Ground layer 20

[0033] Direct-fed stripline 30

[0034] Short circuit strip line 40

[0035] Through hole 50

[0036] The first microstrip line 301

[0037] The second microstrip line 302

[0038] The third microstrip line 303

[0039] Fourth microstrip line 401

[0040] Fifth microstrip line 402

[0041] Sixth microstrip line 403

[0042] Feed point F

[0043] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation methods. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with the present invention. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the attached claims. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the implementation methods in the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0045] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms "a", "the" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0046] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0047] In the description of the present invention, it should be understood that the numerical labels before the steps do not identify the order of executing the steps, but are only used to facilitate the description of the present invention and distinguish each step, and therefore cannot be understood as a limitation of the present invention.

[0048] See also Figure 1 , Figure 1 It is a schematic structural diagram of an embodiment of a triple-band antenna 1 of the present invention.

[0049] In this embodiment, the triple-band antenna 1 is a printed antenna disposed on a surface of a substrate 10. The substrate 10 has a first surface 11 and a second surface 12 opposite to the first surface 11. The triple-band antenna 1 includes a ground layer 20, a direct feed strip line 30, a short circuit strip line 40, a direct feed strip line 30 and a through hole 50.

[0050] In this embodiment, the grounding layer 20 is disposed on the first surface 11 of the substrate 10. The grounding layer 20 is a metal layer printed on the substrate 10. The short-circuit stripline 40 is disposed on the second surface 12 of the substrate 10. A through hole 50 is disposed on the short-circuit stripline 40, and the short-circuit stripline 40 is electrically connected to the grounding layer 20 through the through hole 50. The direct feeding stripline 30 is disposed on the second surface of the substrate 10 and is located on the same surface as the short-circuit stripline 40. One end of the direct feeding stripline 30 serves as a feeding point F, and the short-circuit stripline 40 semi-surrounds the direct feeding stripline 30. The direct feeding stripline 30 and the short-circuit stripline 10 are disposed above the substrate 10, and the grounding layer 20 is disposed below the substrate 10. The projections of the direct feeding stripline 30 and the short-circuit stripline 40 on the first surface 11 do not overlap with the grounding layer 20.

[0051] In this embodiment, the direct feeding strip line 30 is composed of a first microstrip line 301, a second microstrip line 302 and a third microstrip line 303 connected in sequence. Among them, the first microstrip line 301 is in a "ㄈ" shape, with one end suspended. The second microstrip line 302 is in a "Π" shape, with one end electrically connected to the other end of the first microstrip line 301, and the other end is the feeding point. The third microstrip line 303 is in a mirror image "ㄈ" shape, with one end electrically connected to the other end of the second microstrip line, and the other end suspended.

[0052] In this embodiment, the short-circuit strip line 40 is composed of a fourth microstrip line 401, a fifth microstrip line 402 and a sixth microstrip line 403 connected in sequence. Among them, the fourth microstrip line 401 is in a long strip shape, and a through hole 50 is provided at one end. The fifth microstrip line 402 is in a mirror image "ㄈ" shape, and one end is electrically connected to the other end of the fourth microstrip line 401. The sixth microstrip line 403 is in an "L" shape, and one end is electrically connected to the other end of the fifth microstrip line 402, and the other end is suspended.

[0053] In this embodiment, the coupling distance between the first microstrip line 301 and the sixth microstrip line 403 is D1, and the coupling distance between the second microstrip line 302 and the fourth microstrip line 401 is D2. By adjusting the parameters such as the feeding point F, the coupling distance D1 and the coupling distance D2, the working frequency band of the antenna can be adjusted.

[0054] In this embodiment, the gap between the fifth microstrip line 402 and the sixth microstrip line 403 is smaller than the width of the fifth microstrip line 402 and the sixth microstrip line 403. The sixth microstrip line 403 semi-surrounds the direct-feed strip line 30.

[0055] Please see attached Figure 2-5 , attached Figure 2-5 These are the 2D radiation patterns of the triple-band antenna operating at 0.72G, 1.74G, 2.13G and 3.57G respectively.

[0056] Please see attached Figure 6 , attached Figure 6 The efficiency diagram of the three-band antenna of the present invention is shown in the figure. As shown in the figure, the frequency of the three-band antenna reaching below -6dB covers the 2G, 3G, and 4G frequency bands, and also supports the 3.3G~3.6GHz frequency band used by 5G.

[0057] The three-band antenna designed in the present invention adopts a multi-segment coupling method. Under the premise of not loading lumped components, the small size and ultra-wideband of the antenna are ensured. It can not only cover most of the 2G, 3G, and 4G frequency bands, but also support the 3.3GHz to 3.6GHz frequency bands used by 5G.

Claims

1. A triple-band antenna, disposed on a substrate, the substrate having a first surface and a second surface opposite to the first surface, characterized in that: include: A ground layer, disposed on the first surface of the substrate; A short-circuit strip line is arranged on the second surface of the substrate, and one end of the short-circuit strip line is electrically connected to the ground layer through a through hole; A direct feeding strip line is arranged on the second surface of the substrate, one end of the direct feeding strip line is a feeding point, and the short circuit strip line half surrounds the direct feeding strip line; wherein, The direct-fed stripline comprises: The first microstrip line is in the shape of a "ㄈ", with one end suspended; A second microstrip line is in a "Π" shape, one end of which is electrically connected to the other end of the first microstrip line, and the other end is the feeding point; The third microstrip line is in a mirror image "ㄈ" shape, one end of which is electrically connected to the other end of the second microstrip line, and the upper end is suspended.

2. The triple-band antenna according to claim 1, wherein: The short-circuit strip line comprises: The fourth microstrip line is in the shape of a long strip and has the through hole at one end; a fifth microstrip line in a mirror image "ㄈ" shape, one end of which is electrically connected to the other end of the fourth microstrip line; The sixth microstrip line is in an "L" shape, one end of which is electrically connected to the other end of the fifth microstrip line, and the right end is suspended.

3. The triple-band antenna according to claim 2, wherein: A gap between the fifth microstrip line and the sixth microstrip line is smaller than widths of the fifth microstrip line and the sixth microstrip line.

4. The triple-band antenna according to claim 3, wherein: The sixth microstrip line semi-surrounds the direct-feed strip line.

5. The triple-band antenna according to claim 1, wherein: The direct feeding strip line and the short circuit strip line are arranged above the substrate, and the grounding layer is arranged below the substrate.

6. The triple-band antenna according to claim 5, wherein: Projections of the direct feeding strip line and the short circuit strip line on the first surface do not overlap with the ground layer.

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