Double-stub self-resonant antenna

Abstract

The utility model provides a double-stub self-resonant antenna. The antenna comprises a radiation unit, a first resonant cavity and a signal transmission feeder. The radiation unit comprises two branches, and radio frequency current is introduced into each branch for generating an electromagnetic field. And the first resonant cavity is used for forming a resonant body with the radiation unit so as to provide a signal with a preset bandwidth in a working frequency band of the antenna. And the signal transmission feeder line is used for realizing the transmission of the signal between the mainboard and the antenna. According to the utility model, through changing the area ratio between the resonant cavities, the requirements of various working frequency bands and bandwidths can be met under the condition that the size of the antenna configuration space is not changed.

Description

Technical Field

[0001] This utility model relates to the field of radio frequency technology, and in particular to an antenna. Background Technology

[0002] With technological advancements, wireless connectivity has become widely adopted, and antennas are a crucial component in this field. In practical applications, high-quality antenna performance directly improves the quality of communication systems. Mobile communications, autonomous driving, virtual reality, the Internet of Things, as well as aerospace, industry, agriculture, and healthcare all require suitable antennas to achieve wireless connectivity. However, conventional antenna designs typically rely on ground planes on PCBs to achieve greater bandwidth and higher efficiency, resulting in limited installation flexibility.

[0003] Furthermore, existing patent CN115764267A discloses adjusting the antenna's reflection coefficient and operating bandwidth by adjusting the slot depth of the notch on the radiating element. Patent CN110061347B discloses controlling the frequency variation of the notch band by controlling the length variation of the first and second parts of the resonant strip. However, neither of these patents discloses how to obtain the required bandwidth by adjusting the slot width of the ground plane and its corresponding resonant cavity area ratio without changing the antenna configuration space. Therefore, both require changes to the product structure, which is costly and may not provide the optimal operating frequency band and bandwidth required for the corresponding product.

[0004] In order to overcome the above-mentioned defects in the existing technology, there is an urgent need in the field for an improved dual-segment self-resonant antenna to meet the requirements of multiple operating frequency bands and bandwidths without changing the size of the antenna configuration space. Utility Model Content

[0005] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed descriptions that follow.

[0006] In order to overcome the above-mentioned defects in the existing technology, this utility model provides a dual-segment self-resonant antenna, which can meet the requirements of various operating frequency bands and bandwidths without changing the size of the antenna configuration space by changing the area ratio between the resonant cavities.

[0007] Specifically, the antenna provided by this utility model includes a radiating element, a first resonant cavity, and a signal transmission feed line. The radiating element includes two sections, each through which a radio frequency current is passed to generate an electromagnetic field. The first resonant cavity forms a resonator with the radiating element to provide a signal with a preset bandwidth within the antenna's operating frequency band. The signal transmission feed line enables signal transmission between the motherboard and the antenna.

[0008] Furthermore, in some embodiments of this invention, the antenna further includes a second resonant cavity. The area ratio of the first resonant cavity to the second resonant cavity is a preset ratio. The preset ratio is less than or equal to 1.

[0009] Furthermore, in some embodiments of this utility model, the preset ratio is 1:2.

[0010] Furthermore, in some embodiments of this utility model, a gap with a preset distance is maintained between the first resonant cavity and the second resonant cavity.

[0011] Furthermore, in some embodiments of this utility model, the preset spacing is 1mm.

[0012] Furthermore, in some embodiments of this utility model, the first operating frequency band corresponding to the first resonant cavity of the antenna is 3300MHz to 3600MHz. The second operating frequency band corresponding to the second resonant cavity of the antenna is 4800MHz to 5000MHz.

[0013] Furthermore, in some embodiments of this utility model, the reflection coefficient of the antenna in the operating frequency band is less than or equal to -10dB.

[0014] Furthermore, in some embodiments of this utility model, the standing wave ratio (VSWR) of the antenna in the operating frequency band is less than or equal to 2.0.

[0015] Furthermore, in some embodiments of this utility model, the motherboard is a rigid PCB, a flexible FPCB, or is made of stamped or cut metal material.

[0016] Furthermore, in some embodiments of this invention, the antenna is clipped onto the motherboard. Alternatively, the antenna is attached to the inner surface or inner side of the motherboard's casing. Attached Figure Description

[0017] The above-described features and advantages of this invention can be better understood after reading the following detailed description of the embodiments of this disclosure in conjunction with the accompanying drawings. In the drawings, the components are not necessarily drawn to scale, and components having similar related characteristics or features may have the same or similar reference numerals.

[0018] Figure 1 A schematic diagram of the structure of a dual-segment self-resonant antenna according to some embodiments of the present invention is shown.

[0019] Figure 2 The reflection coefficient diagram of a dual-segment self-resonant antenna according to some embodiments of the present invention is shown.

[0020] Figure 3 A schematic diagram of the structure of a dual-segment self-resonant antenna according to some embodiments of the present invention is shown.

[0021] Figure 4 The reflection coefficient diagram of a dual-segment self-resonant antenna according to some embodiments of the present invention is shown.

[0022] Figure 5 A schematic diagram of the structure of a dual-segment self-resonant antenna according to some embodiments of the present invention is shown.

[0023] Figure 6 The reflection coefficient diagram of a dual-segment self-resonant antenna according to some embodiments of the present invention is shown.

[0024] Figure 7 A schematic diagram of the structure of a dual-segment self-resonant antenna according to some embodiments of the present invention is shown.

[0025] Figure 8 The reflection coefficient diagram of a dual-segment self-resonant antenna according to some embodiments of the present invention is shown.

[0026] Figure 9 The reflection coefficient diagram of a dual-segment self-resonant antenna according to some embodiments of the present invention is shown.

[0027] Figure label:

[0028] 11 Radiation Units

[0029] 111-112 limbs

[0030] 12 First resonant cavity

[0031] 13 Signal transmission feeder

[0032] 14 Second resonant cavity

[0033] 15 Connection Points

[0034] M1 First Frequency Point

[0035] M2 Second Frequency Point

[0036] M3 Third Frequency Point

[0037] M4 Fourth Frequency

[0038] M5 Fifth Frequency

[0039] M6 sixth frequency point Detailed Implementation

[0040] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] Furthermore, the terms "upper," "lower," "left," "right," "top," "bottom," "horizontal," and "vertical" used in the following description should be understood as the orientations shown in the relevant paragraphs and accompanying drawings. These relative terms are for illustrative purposes only and do not imply that the described device must be manufactured or operated in a specific orientation; therefore, they should not be construed as limiting the scope of this invention.

[0043] It is understood that although terms such as "first," "second," and "third" may be used herein to describe various components, regions, layers, and / or parts, these components, regions, layers, and / or parts should not be limited by these terms, and these terms are only used to distinguish different components, regions, layers, and / or parts. Therefore, the first component, region, layer, and / or part discussed below may be referred to as the second component, region, layer, and / or part without departing from some embodiments of this utility model.

[0044] As mentioned above, in practical applications, 5G communication antennas can not only solve communication problems between people, between people and things, and between things, but also meet the application needs of mobile terminals, autonomous driving, virtual reality, aerospace, industry, agriculture, and medicine. Conventional antenna designs usually rely on ground planes on PCBs to achieve greater bandwidth and higher efficiency, resulting in poor installation flexibility.

[0045] Furthermore, existing patent CN115764267A discloses adjusting the antenna's reflection coefficient and operating bandwidth by adjusting the slot depth of the notch on the radiating element. Patent CN110061347B discloses controlling the frequency variation of the notch band by controlling the length variation of the first and second parts of the resonant strip. However, neither of these patents discloses how to obtain the required bandwidth by adjusting the slot width of the ground plane and its corresponding resonant cavity area ratio without changing the antenna configuration space. Therefore, both require changes to the product structure, which is costly and may not provide the optimal operating frequency band and bandwidth required for the corresponding product.

[0046] In order to overcome the above-mentioned defects in the existing technology, this utility model provides an antenna that can meet the requirements of multiple operating frequency bands and bandwidths without changing the size of the antenna configuration space by changing the area ratio between the resonant cavities.

[0047] Please refer to the reference for details. Figure 1 and Figure 2 . Figure 1 A schematic diagram of the structure of an antenna provided according to some embodiments of the present invention is shown. Figure 2 A reflection coefficient diagram of an antenna provided according to some embodiments of the present invention is shown.

[0048] exist Figure 1 In the illustrated embodiment, the antenna provided by this invention includes a radiating element 11, a first resonant cavity 12, and a signal transmission feed line 13. Here, the radiating element 11 includes two sections 111-112, each of which is supplied with an alternating radio frequency current to form an alternating electromagnetic field, thereby radiating electromagnetic energy into space. The first resonant cavity 12 forms a resonator with the radiating element 11 to provide a signal with a preset bandwidth within the antenna's operating frequency band. The signal transmission feed line 13 enables signal transmission between the motherboard and the antenna.

[0049] Here, the specific lengths of the aforementioned sections 111-112 can be adjusted according to the operating frequency band of the antenna. Specifically, the resonant frequency of the antenna is inversely related to the lengths of the sections 111-112 and the area of ​​the first resonant cavity 12 (i.e., ground); that is, a larger size corresponds to a lower resonant frequency.

[0050] Furthermore, such as Figure 2 As shown, the first resonant cavity 12 of the antenna provided by this utility model corresponds to a working frequency range of 3375MHz to 5225MHz and a bandwidth of 1.85GHz.

[0051] Therefore, in the embodiment where only the first resonant cavity 12 is provided, the antenna provided by this utility model becomes a single-band broadband antenna.

[0052] Furthermore, in some preferred embodiments, the antenna provided by the first aspect of this invention further includes a second resonant cavity 14. Here, the area ratio of the first resonant cavity 12 to the second resonant cavity 14 is a preset ratio, which is less than or equal to 1.

[0053] Please refer to further details. Figure 3 and Figure 4 . Figure 3 A schematic diagram of the structure of an antenna provided according to some embodiments of the present invention is shown. Figure 4 A reflection coefficient diagram of an antenna provided according to some embodiments of the present invention is shown.

[0054] Specifically, in Figure 3 In the embodiment shown, the preset ratio of the first resonant cavity 12 to the second resonant cavity 14 is 1:1.

[0055] like Figure 4 As shown, the first resonant cavity 12 of the antenna provided by this utility model corresponds to a first operating frequency band of 3090MHz to 3425MHz, with a bandwidth of 335MHz. The second resonant cavity corresponds to a second operating frequency band of 4300MHz to 5255MHz, with a bandwidth of 955MHz.

[0056] Therefore, in the embodiment where two resonant cavities are provided and the area ratio of the first resonant cavity 12 to the second resonant cavity 14 is 1:1, the low-frequency and high-frequency portions of the antenna provided by this utility model are both offset, and the reflection coefficient of its high-frequency portion deteriorates.

[0057] Please combine further Figure 5 and Figure 6 . Figure 5 A schematic diagram of the structure of an antenna provided according to some embodiments of the present invention is shown. Figure 6 A reflection coefficient diagram of an antenna provided according to some embodiments of the present invention is shown.

[0058] Specifically, in Figure 5 In the embodiment shown, the preset ratio of the first resonant cavity 12 to the second resonant cavity 14 is 1:3.

[0059] like Figure 6As shown, the first resonant cavity 12 of the antenna provided by this utility model corresponds to a first operating frequency band of 3195MHz to 3580MHz, with a bandwidth of 385MHz. The second resonant cavity corresponds to a second operating frequency band of 4540MHz to 5280MHz, with a bandwidth of 640MHz.

[0060] Therefore, in the embodiment where two resonant cavities are provided and the area ratio of the first resonant cavity 12 to the second resonant cavity 14 is 1:3, the high-frequency part of the antenna provided by this utility model is shifted, the bandwidth of the low-frequency part is narrowed, and the reflection coefficients of both the low-frequency and high-frequency parts are worse.

[0061] Thus, in Figure 1 , Figure 3 and Figure 5 In the embodiments shown, the frequency bands of the antennas provided by this utility model cannot adequately meet the requirements of the operating frequency band.

[0062] Please refer to further details. Figures 7-9 . Figure 7 A schematic diagram of the structure of an antenna provided according to some embodiments of the present invention is shown. Figure 8 A reflection coefficient diagram of an antenna provided according to some embodiments of the present invention is shown. Figure 9 A reflection coefficient diagram of an antenna provided according to some embodiments of the present invention is shown.

[0063] Furthermore, in Figure 7 In the embodiment shown, the preset ratio of the first resonant cavity 12 to the second resonant cavity 14 is preferably set to 1:2.

[0064] like Figure 8 As shown, the first resonant cavity 12 of the antenna provided by this utility model corresponds to a first operating frequency band of 3195MHz to 3615MHz, with a bandwidth of 420MHz. The second resonant cavity corresponds to a second operating frequency band of 4670MHz to 5235MHz, with a bandwidth of 565MHz.

[0065] Therefore, in the embodiment where two resonant cavities are provided and the area ratio of the first resonant cavity 12 to the second resonant cavity 14 is 1:2, the antenna provided by this utility model can cover the required low-frequency and high-frequency bands, and its reflection coefficient also meets the requirements.

[0066] Thus, the antenna provided by this invention can be easily adjusted and optimized through a simple and convenient debugging process, ensuring its optimal performance in different working environments. Furthermore, the antenna design makes it easy to match with various devices, adapting to the requirements of different systems and reducing the difficulty of system integration. In addition, the antenna's manufacturing process is simple, with low requirements for equipment and technology during production, thereby reducing manufacturing costs and offering high cost-effectiveness.

[0067] Specifically, the resonant frequency of the antenna provided by this invention is negatively correlated with the areas of the first resonant cavity 12 and the second resonant cavity 14; that is, the larger the cavity, the lower the resonant frequency. Therefore, in actual design, those skilled in the art can first calculate the area based on the target frequency point and reserve an appropriately enlarged area for subsequent adjustments.

[0068] Furthermore, the first operating frequency band corresponding to the first resonant cavity 12 of the antenna provided by this utility model is 3300MHz to 3600MHz, and the second operating frequency band corresponding to the second resonant cavity 14 of the antenna is 4800MHz to 5000MHz.

[0069] In addition, such as Figure 8 As shown, the reflection coefficient of the antenna provided by this utility model in the operating frequency band is less than or equal to -10dB.

[0070] Specifically, at the first frequency point M1 (3195MHz), the reflection coefficient S22 is -10.5dB. At the second frequency point M2 (3365MHz), the reflection coefficient S22 is -20.1dB. At the third frequency point M3 (3615MHz), the reflection coefficient S22 is -10dB. At the fourth frequency point M4 (4670MHz), the reflection coefficient S22 is -9.6dB. At the fifth frequency point M5 (4995MHz), the reflection coefficient S22 is -24.8dB. At the sixth frequency point M6 (5235MHz), the reflection coefficient S22 is -10dB.

[0071] In addition, such as Figure 9 As shown, the antenna provided by this utility model has a standing wave ratio (VSWR) of less than or equal to 2.0 in the operating frequency band.

[0072] Specifically, at the first frequency point M1 at 3195MHz, the Standing Wave Ratio (SWR) is 1.8. At the second frequency point M2 at 3365MHz, the SWR is 1.2. At the third frequency point M3 at 3615MHz, the SWR is 1.9. At the fourth frequency point M4 at 4670MHz, the SWR is 2.0. At the fifth frequency point M5 at 4995MHz, the SWR is 1.2. At the sixth frequency point M6 at 5235MHz, the SWR is 1.9.

[0073] exist Figure 8 and Figure 9 In the illustrated embodiment, the bandwidth of the low-frequency portion of the antenna provided by this invention is between the first frequency point M1 and the third frequency point M3, which is 420MHz. The bandwidth of the high-frequency portion is between the fourth frequency point M4 and the sixth frequency point M6, which is 565MHz.

[0074] Thus, the antenna provided by this invention can be applied to 5G communication systems, supporting operating frequency bands of 3300MHz to 3600MHz and 4800MHz to 5000MHz, covering multiple important frequency bands in current 5G networks. Furthermore, within these frequency bands, the antenna's VSWR remains consistently below or equal to 2.0, ensuring signal transmission efficiency and stability, avoiding signal loss or interference caused by mismatch, thereby improving overall communication performance.

[0075] In addition, Figure 3 , Figure 5 and Figure 7 In the embodiment shown, a gap with a preset distance is maintained between the first resonant cavity 12 and the second resonant cavity 14.

[0076] Furthermore, in some preferred embodiments, the aforementioned preset spacing is 1 mm.

[0077] Those skilled in the art will understand that the above-described embodiment in which the gap between the first resonant cavity 12 and the second resonant cavity 14 is set to 1 mm is merely a non-limiting implementation method provided by this utility model, intended to clearly demonstrate the main concept of this utility model and provide some specific solutions that are easy for the public to implement, rather than intended to limit the scope of protection of this utility model.

[0078] Alternatively, in other embodiments, those skilled in the art can also exercise control during actual operation to achieve convenience and controllability in engineering production.

[0079] In addition, Figure 1 , Figure 3 , Figure 5 and Figure 7In the illustrated embodiment, the antenna provided by this utility model further includes a connection point 15. This connection point is located between the signal and ground of the signal transmission feed line 13 and is used to feed the radio frequency signal transmitted by the original circuit to the branches 111-112.

[0080] Furthermore, in some embodiments, the mainboard of the antenna provided by this invention is a non-RF high-loss substrate. Specifically, the mainboard can be a rigid PCB, a flexible PCB, or made of stamped or cut metal material (e.g., phosphor bronze substrate).

[0081] Furthermore, in some embodiments, the antenna provided by this invention is attached to the motherboard.

[0082] Alternatively, in some embodiments, the antenna provided by this invention is attached to the inner surface or inner side of the motherboard casing.

[0083] Thus, the antenna provided by this invention is also very flexible in terms of installation, and can be directly soldered onto the PCB board of the motherboard, making it suitable for applications that need to be integrated into compact electronic products. Furthermore, for other product design requirements, the antenna can also be fixed to the device housing, adapting to the appearance design requirements of devices of different shapes and sizes, providing greater design freedom.

[0084] In summary, the dual-segment self-resonant antenna provided by this utility model can meet various operating frequency bands and bandwidth requirements without changing the size of the antenna configuration space by changing the area ratio between the resonant cavities.

[0085] Although the methods described above are illustrated and depicted as a series of actions for the sake of simplicity, it should be understood and appreciated that these methods are not limited by the order of the actions, as some actions may occur in a different order and / or concurrently with other actions from the illustrations and descriptions herein or not illustrated and described herein but which may be understood by those skilled in the art, according to one or more embodiments.

[0086] The prior description of this disclosure is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not intended to be limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-segment self-resonant antenna, characterized in that, include: The radiating unit includes two sections, each of which is supplied with a radio frequency current to generate an electromagnetic field. The first resonant cavity is used to form a resonator with the radiating element to provide a signal with a preset bandwidth within the operating frequency band of the antenna; as well as A signal transmission feeder is used to transmit the signal between the motherboard and the antenna.

2. The antenna as described in claim 1, characterized in that, It also includes a second resonant cavity, wherein the area ratio of the first resonant cavity to the second resonant cavity is a preset ratio, and the preset ratio is less than or equal to 1.

3. The antenna as described in claim 2, characterized in that, The preset ratio is 1:

2.

4. The antenna as described in claim 2, characterized in that, A gap with a predetermined spacing is maintained between the first resonant cavity and the second resonant cavity.

5. The antenna as described in claim 4, characterized in that, The preset spacing is 1mm.

6. The antenna as described in claim 3, characterized in that, The first resonant cavity of the antenna corresponds to a first operating frequency band of 3300MHz to 3600MHz, and the second resonant cavity of the antenna corresponds to a second operating frequency band of 4800MHz to 5000MHz.

7. The antenna as described in claim 3, characterized in that, The reflection coefficient of the antenna in the operating frequency band is less than or equal to -10dB.

8. The antenna as described in claim 3, characterized in that, The antenna's standing wave ratio (VSWR) in the operating frequency band is less than or equal to 2.

0.

9. The antenna as claimed in claim 1, characterized in that, The motherboard is a rigid PCB, a flexible PCB, or made of stamped or cut metal material.

10. The antenna as claimed in claim 1, characterized in that, The antenna is clipped onto the motherboard; or The antenna is attached to the inner surface or inner side of the motherboard casing.

Images