A miniaturized dual-band antenna

Abstract

The present invention provides a miniaturized dual-band antenna, comprising a first dipole arm and a second dipole arm that are symmetrical to each other, wherein the dipole formed by the first dipole arm and the second dipole arm is used to generate a first resonance point; the first dipole arm and the second dipole arm are respectively provided with a first U-shaped groove, the two first U-shaped grooves are symmetrical to each other and their openings are opposite to each other, the first U-shaped groove is used to generate a second resonance point, and the frequency of the first resonance point is different from the frequency of the second resonance point; the two ends of the first dipole arm and the second dipole arm that are close to each other are respectively connected to a feeding structure. The dual-band antenna of the present invention adopts a new dual-band structure, which can be loaded with a combination of multiple grooves to achieve broadband matching in the high frequency band. At the same time, it has the advantages of miniaturization and high radiation efficiency, and can better meet the requirements of the Wifi 6E frequency band.

Description

Technical Field

[0001] The present invention relates to an antenna in a wireless communication system, and in particular to a miniaturized dual-frequency antenna. Background Art

[0002] Antennas are essential components in systems such as wireless communications and radar. Their performance determines the performance and quality of the entire wireless system. With the rapid advancement of wireless communication technologies, such as 5G and the Internet of Things, there is an urgent need to develop high-quality antenna components suitable for these applications. Wi-Fi antennas are widely used in wireless communications systems, and there is a significant demand for low-cost, high-efficiency, and miniaturized dual-band Wi-Fi antennas. Currently, commonly used Wi-Fi antennas are primarily monopoles and dipoles, including all-metal and printed circuit board (PCB) designs. Dual-band PIFA antennas are also a common antenna structure. Dual-band antennas are generally manufactured using PCB technology, as they are more complex than single-band antennas. The difficulty and cost of manufacturing all-metal structures are high. Dual-band PCB antennas typically integrate two dipoles for power feeding, achieving dual-band radiation coverage across two Wi-Fi frequency bands. In addition to matching the two frequency bands separately, there are also solutions that use two antennas for separate coverage, or ultra-wideband antennas for dual-band coverage.

[0003] As the demand for more connected devices continues to grow, Wi-Fi 6E will enable enterprises and service providers to support emerging applications and maintain optimal performance for every connected device. Wi-Fi 6E is a future standard that extends Wi-Fi 6 (also known as 802.11ax). In addition to the currently supported 2.4 GHz and 5 GHz bands, it also supports 802.11ax features in the unlicensed 6 GHz band. Leveraging this expanded spectrum capacity in 6 GHz opens up a promising future for continuous innovation in Wi-Fi user experiences and connected devices. The Wi-Fi 6E standard further enhances the user experience on 802.11ax networks with faster and more reliable Wi-Fi networks. These networks are designed to handle the surge in device density and high-bandwidth applications such as video streaming, video conferencing, and voice calls. Existing Wi-Fi 6E antennas are largely inherited from Wi-Fi 6 antennas, covering the higher bands of 5-7.125 GHz. They are essentially dual-band antennas, but with a wider bandwidth in the higher bands.

[0004] Currently, commonly used dual-band antennas on printed circuit boards (PCBs) typically implement dual-band connectivity by adding metal walls or slots to a low-frequency antenna to achieve high-frequency matching. However, adding metal walls increases the antenna's lateral dimensions, typically reaching half the antenna's longitudinal length at the low frequency. Antennas with slots typically struggle to achieve broadband matching at high frequencies, failing to cover Wi-Fi 6 or Wi-Fi 6E bands and resulting in very low radiation efficiency.

[0005] As for the currently commonly used ultra-wideband antennas, ultra-wideband monopole antennas are generally used. They have the advantage of wide bandwidth and do not need to consider the problem of frequency offset. However, ultra-wideband monopole antennas are generally large in size and require a large ground. Otherwise, current will flow on the feed line, causing the radiation pattern to shift and may flow into the circuit and affect the operation of the chip.

[0006] Currently commonly used all-metal dual-band Wi-Fi antennas are generally processed by laser cutting of metal sheets. The advantages are zero dielectric loss and high efficiency, but the processing accuracy is poor, the antenna consistency is poor, and frequency deviation is prone to degrade performance. Especially when the bandwidth is narrow, the frequency deviation will increase, reduce radiation efficiency, and may also affect the RF chip output port.

[0007] Furthermore, current dual-band implementations require multi-branch antennas, which increase the size of the antenna structure and are unsuitable for use in small devices. Using matching circuits to achieve dual-band operation typically results in a narrow bandwidth and is prone to frequency deviation due to component tolerances. Summary of the Invention

[0008] The object of the present invention is to at least partially solve the above-mentioned problems in the prior art and provide a miniaturized dual-band antenna.

[0009] The present invention provides a miniaturized dual-band antenna, which includes a first dipole arm and a second dipole arm that are symmetrical to each other, wherein the dipole formed by the first dipole arm and the second dipole arm is used to generate a first resonance point;

[0010] The first dipole arm and the second dipole arm each have a first U-shaped groove, the two first U-shaped grooves are symmetrical to each other and their openings face each other, the first U-shaped grooves are used to generate a second resonance point, and the frequency of the first resonance point is different from the frequency of the second resonance point;

[0011] Two ends of the first dipole arm and the second dipole arm close to each other are respectively connected to the feeding structure.

[0012] Preferably, the first dipole arm and the second dipole arm each have a second U-shaped groove, the two second U-shaped grooves are symmetrical to each other and their openings are opposite to each other, and the second U-shaped groove and the first U-shaped groove are located on the same axis;

[0013] The second U-shaped groove is used to generate a third resonance point, and the frequency of the third resonance point is different from the frequency of the first resonance point and the frequency of the second resonance point.

[0014] Preferably, the first U-shaped groove and the second U-shaped groove have different sizes.

[0015] Preferably, a linear slot is provided on each of the two ends of the first dipole arm and the second dipole arm, and the two linear slots are orthogonal to the gap between the first dipole arm and the second dipole arm; the linear slot is used to generate a fourth resonance point, and the frequency of the fourth resonance point is different from the frequency of the first resonance point, the frequency of the second resonance point, and the frequency of the third resonance point.

[0016] Preferably, the frequency of the first resonance point covers the 2.4-2.5 GHz frequency band.

[0017] Preferably, the combination of the second resonance point, the third resonance point and the fourth resonance point covers a frequency band of 5-7.125 GHz.

[0018] Preferably, a dielectric substrate is provided, and the first dipole arm and the second dipole arm are constructed on the dielectric substrate.

[0019] Preferably, the dielectric substrate has a thickness of 1 mm, a dielectric constant of 4.4, and a loss tangent of 0.02.

[0020] The present invention also provides another miniaturized dual-band antenna, which includes a floor, a radiating monopole and a feed line, wherein the key features are: the radiating monopole is used to generate a first resonance point;

[0021] The radiating monopole has a first U-shaped groove, the first U-shaped groove is used to generate a second resonance point, and the frequency of the first resonance point is different from the frequency of the second resonance point;

[0022] The radiating monopole is constructed on the floor and is connected to the feeding line.

[0023] As a further preference, the radiating monopole has a second U-shaped groove, the second U-shaped groove and the first U-shaped groove are located on the same axis and have the same opening direction, and the second U-shaped groove is used to generate a third resonance point;

[0024] A straight slot is provided at one end of the radiating monopole toward which the opening of the first U-shaped slot is directed, and the straight slot is used to generate a fourth resonance point;

[0025] The linear slot, the first U-shaped slot and the second U-shaped slot are sequentially distributed on the axis in the length direction of the radiating monopole, and the frequencies of the first resonance point, the second resonance point, the third resonance point and the fourth resonance point are different from each other.

[0026] The beneficial effects of the present invention are at least embodied in:

[0027] The miniaturized dual-band antennas of some embodiments of the present invention utilize a novel dual-band antenna structure. By adding a slot structure to the low-frequency dipole, broadband matching can be achieved in the high-frequency band, thereby enabling the antenna's dual-band radiation to cover both frequency bands. The low-frequency band can cover the 2.4-2.5GHz band, and the high-frequency band can fully cover the 5-7.125GHz band. Compared to existing dual-band WiFi antennas, this greatly broadens the antenna bandwidth, has higher radiation efficiency, and is well suited for the Wi-Fi 6E band.

[0028] Furthermore, the antenna's two frequency bands can be independently adjusted and designed, and the slots in the high-frequency band barely affect the matching of the low-frequency band. Furthermore, the manufacturing process is simple and cost-effective. Furthermore, the antenna's structural design eliminates the need for lumped component matching, eliminates additional branch loading, and results in a smaller antenna size.

[0029] In some embodiments of the miniaturized dual-band antenna, the antenna may be configured as a monopole antenna, which may further reduce the length of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the antenna structure of the first embodiment of the present application;

[0031] Figure 2 This is a schematic diagram of the antenna structure of the second embodiment of the present application;

[0032] Figure 3 This is a schematic diagram of the antenna structure of the second embodiment of the present application;

[0033] Figure 4 This is a diagram showing the size parameters of the antenna according to the embodiment of the present application;

[0034] Figure 5 The simulated reflection coefficients of the antennas of different embodiments of the present application;

[0035] Figure 6 This is an S-parameter diagram of the antenna test of the embodiment of the present application;

[0036] Figure 7 The radiation patterns of the antenna in the embodiment of the present application at different frequencies.

[0037] Reference numerals

[0038] 1-first dipole arm, 2-second dipole arm, 3-first U-shaped slot, 4-feeding structure, 5-gap, 6-second U-shaped slot, 7-linear slot, 8-dielectric substrate. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] See also Figure 1-7 As shown, the specific embodiments provided by the present invention are as follows:

[0041] Example 1

[0042] See Figure 1 As shown, as a miniaturized dual-band antenna of an embodiment, it includes a first dipole arm 1 and a second dipole arm 2 that are symmetrical to each other, and the dipole formed by the first dipole arm 1 and the second dipole arm 2 is used to generate a first resonance point;

[0043] The first dipole arm 1 and the second dipole arm 2 each have a first U-shaped groove 3, the two first U-shaped grooves 3 are symmetrical to each other and their openings face each other, and the first U-shaped grooves 3 are used to generate a second resonance point, and the frequency of the first resonance point is different from the frequency of the second resonance point;

[0044] The two ends of the first dipole arm 1 and the second dipole arm 2 close to each other are respectively connected to the feeding structure 4. Optionally, the feeding structure 4 can be configured as a feeding metal sheet, or as a feeding port. For actual feeding, the outer conductor and the inner conductor of the feeding coaxial line are respectively connected to the two ends of the feeding port.

[0045] It can be understood that in this embodiment, a new dual-band antenna with a dipole-loaded slotted structure is proposed. In this antenna, there is no need to use lumped component matching, there is no additional branch loading, and the antenna size is very small. Specifically, the overall structure of the antenna is a dipole. The first dipole arm 1 and the second dipole arm 2 constituting the dipole can resonate at one frequency by themselves, and by loading the first U-shaped slot on the dipole, the antenna can achieve broadband radiation in the high frequency band. It can be further understood that the shape and size of the two first U-shaped slots are set to be the same, and the openings are respectively facing the ends of the first dipole arm 1 and the second dipole arm 2 that are close to each other. The two first U-shaped slots are symmetrical about the vertical center line between the first dipole arm 1 and the second dipole arm 2; there is a gap 5 between the first dipole arm 1 and the second dipole arm 2, and there is a certain distance between the first U-shaped slot and the gap 5.

[0046] Further optionally, each first U-shaped groove can be configured to consist of a middle vertical groove section and two horizontal groove sections vertically connected at both ends of the vertical groove section, see the attached Figure 1 In the embodiment, the length direction of the first dipole arm 1 and the second dipole arm 2 is the X-axis direction, and the direction perpendicular to the length direction is the Y-axis direction. The vertical slot section is parallel to the Y direction, and the horizontal slot section is parallel to the X direction.

[0047] As a typical application, when used as a Wi-Fi dual-band antenna, the dipole resonant frequency can be configured to cover the 2.4-2.5 GHz frequency band. The pair of first U-shaped grooves opened on the dipole can generate a resonance point at 5-6 GHz, thereby achieving coverage of the low-frequency band and high-frequency band of Wi-Fi.

[0048] Example 2

[0049] pass Figure 5 The test results of the simulated reflection coefficient of the antenna of Example 1 show that although the antenna of Example 1 has an improved high-frequency bandwidth compared to the existing Wi-Fi dual-band antenna, it still cannot provide better coverage of 5-7.125 GHz. Figure 2 As shown, based on Example 1, as a further improvement, in the miniaturized dual-band antenna of this embodiment, the first dipole arm 1 and the second dipole arm 2 each have a second U-shaped groove 6, the two second U-shaped grooves 6 are symmetrical to each other and have openings facing each other, and the second U-shaped groove 6 and the first U-shaped groove 3 are located on the same axis; specifically, the two first U-shaped grooves 3 and the two second U-shaped grooves 6 are arranged in a straight line in the X-axis direction, the second U-shaped groove is located on one side of the vertical groove section of the corresponding first U-shaped groove, and there is a certain gap between the second U-shaped groove and the first U-shaped groove;

[0050] The second U-shaped groove is used to generate a third resonance point, and the frequency of the third resonance point is different from the frequency of the first resonance point and the frequency of the second resonance point.

[0051] It can be understood that in this embodiment, by loading the second U-shaped groove 6 on the first resonant arm 1 and the second resonant arm respectively, the second U-shaped groove 6 can generate a third resonant point in the 5-6GHz frequency band, and the frequency of this resonant point is different from the frequency of the second resonant point generated by the first U-shaped groove. The combination of the two resonant points can further broaden the operating frequency band of the antenna.

[0052] Further preferably, the second U-shaped groove can be dimensioned differently from the first U-shaped groove, thereby achieving the goal of generating different resonant frequencies. While achieving the desired resonant frequency, the difference in dimensions can be optimized and adjusted based on actual design needs. For example, the lengths of the horizontal groove segments (i.e., the lengths along the X-axis) in the second U-shaped groove and the first U-shaped groove can be set to be different.

[0053] Example 3

[0054] pass Figure 5 From the simulated reflection coefficient test results of the antenna of Example 2, it can be found that although the high-band bandwidth of the antenna of Example 2 is further broadened compared to the dual-band antenna of Example 1, it still cannot well meet the higher frequency bandwidth requirements proposed for Wi-Fi 6 or Wi-Fi 6E bands. Based on this, refer to Figure 3 As shown, based on Example 2, as a further improvement scheme, in the miniaturized dual-band antenna of this embodiment, a linear slot 7 is respectively provided at two mutually adjacent ends of the first dipole arm 1 and the second dipole arm 2, and the two linear slots 7 form a vertical orthogonal relationship with the gap 5 between the first dipole arm 1 and the second dipole arm 2; the linear slots 7 are used to generate a fourth resonance point, and the frequency of the fourth resonance point is different from the frequency of the first resonance point, the frequency of the second resonance point, and the frequency of the third resonance point.

[0055] It can be understood that in this embodiment, by loading the linear slots 7 at corresponding positions on the first dipole arm 1 and the second dipole arm 2, the linear slots 7 can generate another resonance point in the high frequency band, namely the fourth resonance point. Thus, the combination of the three resonance points generated in the high frequency band greatly broadens the working bandwidth of the antenna. Figure 5 As shown in , the dual-band antenna structure based on this embodiment can fully cover the 5-7.125GHz frequency band, can better meet the Wi-Fi 6 or Wi-Fi 6E frequency band requirements, and obtain a wider high-frequency band bandwidth compared to the existing Wi-Fi dual-band antenna.

[0056] As a preferred embodiment, the dual-band antenna of this embodiment further includes a dielectric substrate 8, on which the first dipole arm and the second dipole arm are constructed. Optionally, the dielectric substrate 8 has a thickness of 1 mm, a dielectric constant of 4.4, and a loss tangent of 0.02.

[0057] See Figure 4 , shows the size parameters of the dual-band antenna in this embodiment, wherein the optimized design size is as follows: wherein, l d is the total length of the dipole composed of the first resonant arm and the second resonant arm, l s1 is the length of the first U-shaped groove, l s2 is the length of the second U-shaped groove, l s4 is the width of the first U-shaped groove, l s3 is the width of the second U-shaped groove, l s5 The total length of the two straight slots plus the gap in the middle, w s1 is the width of the vertical groove section of the second U-shaped groove, w s2 is the width of the vertical groove section of the first U-shaped groove, w s3 is the width of the horizontal groove section of the second U-shaped groove, w s4 is the width of the horizontal groove section of the first U-shaped groove, w s5 is the width of the linear slot, w g2 is the distance between the first U-shaped groove and the second U-shaped groove, w g1 is the distance between the first U-shaped slot and the gap between the two dipole arms, w g is the width of the gap between the two dipole arms, w d is the width of the entire dipole.

[0058] Through optimization design, the specific parameter design values are: d =44.85mm, l s1 =6.6mm,l s2 =7.68mm,l s3 =3.2mm,l s4 =4.67mm,l s5 =6.84mm,w s1 =0.73mm,w s2 =0.35mm,w s3 =0.68mm,w s4 =0.55mm,w s5 =0.54mm,w g1 =0.46mm,w g2 =2.82mm,w g =0.772mm,w d =5mm.

[0059] See Figure 6 Shown is an S-parameter diagram of the antenna test according to an embodiment of the present application; Figure 7 These are the radiation patterns of the antenna of the embodiment of the present application at different frequencies, where Figure (a) is for 2.4 GHz, Figure (b) is for 5 GHz, Figure (c) is for 6 GHz, and Figure (d) is for 7 GHz.

[0060] Example 4

[0061] The present invention also provides another miniaturized dual-band antenna, comprising a floor, a radiating monopole, and a feeder line. The radiating monopole is configured to generate a first resonance point; the radiating monopole has a first U-shaped groove, the first U-shaped groove being configured to generate a second resonance point, the frequency of the first resonance point being different from the frequency of the second resonance point; the radiating monopole is constructed on the floor and connected to the feeder line. It is understood that the antenna of this embodiment can achieve low-frequency resonance, such as resonance in the 2.4-2.5 GHz frequency band, through the radiating monopole, while the first U-shaped groove can generate another resonance point in the 5-6 GHz frequency band, thereby achieving dual-band. The miniaturized dual-band antenna of this embodiment is a monopole antenna. Compared to the dipole antenna of the above embodiment, the antenna of this embodiment can significantly shorten the total length of the antenna. At the same time, the antenna of this embodiment requires a relatively large floor. Therefore, this embodiment can be applied to different scenarios according to actual needs.

[0062] As a further preference, the radiating monopole has a second U-shaped groove, the second U-shaped groove and the first U-shaped groove are located on the same axis and have the same opening direction, and the second U-shaped groove is used to generate a third resonance point;

[0063] A straight slot is provided at one end of the radiating monopole toward which the opening of the first U-shaped slot is directed, and the straight slot is used to generate a fourth resonance point;

[0064] The linear slot, the first U-shaped slot, and the second U-shaped slot are sequentially distributed along the length axis of the radiating monopole. The frequencies of the first, second, third, and fourth resonance points are mutually exclusive. It will be appreciated that in this embodiment, three different resonance points can be achieved by varying dimensional parameters such as the length of the first U-shaped slot, the second U-shaped slot, and the linear slot. The combination of these three resonance points enables a wider operating frequency band in the high-frequency band, achieving complete coverage of the 5-7.125 GHz high-frequency band used in Wi-Fi.

[0065] In the description of the embodiments of the present invention, specific features, structures or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0066] In describing the embodiments of the present invention, it should be understood that "-" and "~" represent a range between two values, and the range includes the endpoints. For example, "AB" represents a range greater than or equal to A and less than or equal to B. "A~B" represents a range greater than or equal to A and less than or equal to B.

[0067] In describing the embodiments of the present invention, the term "and / or" is used herein to describe a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " is generally used herein to indicate that the associated objects are in an "or" relationship.

[0068] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A miniaturized dual-band antenna, characterized in that: It comprises a first dipole arm and a second dipole arm which are symmetrical to each other, wherein the dipole formed by the first dipole arm and the second dipole arm is used to generate a first resonance point; The first dipole arm and the second dipole arm each have a first U-shaped groove, the two first U-shaped grooves are symmetrical to each other and their openings face each other, the first U-shaped grooves are used to generate a second resonance point, and the frequency of the first resonance point is different from the frequency of the second resonance point; Two ends of the first dipole arm and the second dipole arm close to each other are respectively connected to the feeding structure; The first dipole arm and the second dipole arm each have a second U-shaped groove, the two second U-shaped grooves are symmetrical to each other and their openings are opposite to each other, and the second U-shaped groove and the first U-shaped groove are located on the same axis; the second U-shaped groove is used to generate a third resonance point, and the frequency of the third resonance point is different from the frequency of the first resonance point and the frequency of the second resonance point; In which, a linear slot is respectively provided on the two ends of the first dipole arm and the second dipole arm, which are close to each other, and the two linear slots are orthogonal to the gap between the first dipole arm and the second dipole arm; the linear slot is used to generate a fourth resonance point, and the frequency of the fourth resonance point is different from the frequency of the first resonance point, the frequency of the second resonance point, and the frequency of the third resonance point.

2. The miniaturized dual-band antenna according to claim 1, wherein: The first U-shaped groove and the second U-shaped groove have different sizes.

3. The miniaturized dual-band antenna according to claim 1, wherein: The frequency of the first resonance point covers the 2.4-2.5 GHz frequency band.

4. The miniaturized dual-band antenna according to claim 3, wherein: The combination of the second resonance point, the third resonance point and the fourth resonance point covers a frequency band of 5-7.125 GHz.

5. The miniaturized dual-band antenna according to claim 1, wherein: A dielectric substrate is provided, on which the first dipole arm and the second dipole arm are constructed.

6. The miniaturized dual-band antenna according to claim 5, characterized in that: The thickness of the dielectric substrate is 1 mm, the dielectric constant is 4.4, and the loss tangent is 0.02.

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