Circularly polarized antenna and electronic device

Abstract

The present disclosure relates to the technical field of antennas, and provides a circularly polarized antenna and an electronic device. The circularly polarized antenna comprises a substrate, a parasitic branch and an excitation branch. The substrate is provided with an adjusting portion for adjusting a current path thereof. The parasitic branch is connected to a first edge portion of the substrate. The excitation branch is connected to a second edge portion of the substrate. The first edge portion and the second edge portion are two intersecting edge portions in the substrate. The circularly polarized antenna comprises a first frequency mode and a second frequency mode. In the first frequency mode, the substrate is conductive with the parasitic branch and the excitation branch respectively to form a first current path. In the second frequency mode, the excitation branch, the substrate and the parasitic branch are correspondingly conductive to form a second current path. The second current path has a path difference with the first current path, and the path difference can adjust a phase difference between a first current in the first current path and a second current in the second current path. The electronic device comprises the circularly polarized antenna.

Description

Technical Field

[0001] This disclosure relates to the field of antenna technology, and more particularly to a circularly polarized antenna and electronic device. Background Technology

[0002] Currently, some small electronic devices, such as smartwatches and smart bracelets, have satellite positioning and trajectory recording functions. However, due to the obstruction of ground buildings, the transmission efficiency from satellite to the ground is reduced. Therefore, the satellite transmitting antenna to the ground generally adopts a right-hand circular polarization. Circular polarization antennas have advantages such as high anti-interference, reduced polarization loss, overcoming multipath effects, miniaturization, and broadband.

[0003] However, due to the limited size and industrial design of smaller electronic devices such as smartwatches and smart bracelets, it is difficult to implement single-band circularly polarized antennas. The challenge is even greater for multi-band circularly polarized antennas. Therefore, realizing multi-band circularly polarized antennas in wearable devices is a pressing problem that the industry needs to solve. Summary of the Invention

[0004] This disclosure provides a circularly polarized antenna and an electronic device to at least solve the problem that circularly polarized antennas are difficult to adapt to miniaturized electronic devices in the prior art.

[0005] The circularly polarized antenna provided in this disclosure includes a substrate, parasitic stubs, and excitation stubs;

[0006] The substrate is provided with an adjustment part for adjusting its own current path;

[0007] The parasitic branch is connected to the first side of the substrate;

[0008] The excitation branch is connected to the second side of the base; the first side and the second side are two intersecting sides of the base;

[0009] The circularly polarized antenna includes a first frequency mode and a second frequency mode;

[0010] In the first frequency mode, the substrate is connected to the parasitic branch and the excitation branch to form a first current path;

[0011] In the second frequency mode, the excitation branch, the substrate, and the parasitic branch are respectively turned on to form a second current path;

[0012] The second current path has a path difference with the first current path, and the path difference can adjust the phase difference between the first current in the first current path and the second current in the second current path.

[0013] In one embodiment, the adjustment part includes an opening slit formed in the substrate;

[0014] The opening end of the slit is formed in the first side of the substrate where the parasitic branch is located, and the bottom end of the slit extends toward the interior of the substrate.

[0015] In one embodiment, a plug that is electrically connected to the substrate is provided at the bottom end of the opening slit;

[0016] The opening slit can be filled by the plug to reduce its own slit length in the substrate, thereby adjusting the phase difference between the first current and the second current in the substrate.

[0017] In one embodiment, a sliding member electrically connected to the substrate is movably disposed in the opening;

[0018] The slider electrically connects the two sides of the opening along the width direction of the opening, and the slider can slide back and forth along the length direction of the opening to adjust the length of the first current path and the second current path.

[0019] In one embodiment, the parasitic branch includes a connecting segment, an extension segment, and a feed point;

[0020] One end of the connecting segment is perpendicular to the plane of the base;

[0021] The extension segment and the other end of the connecting segment satisfy the perpendicular condition, and the other end extends along the direction of the first side.

[0022] One end of the feed point is connected to the extension section, and the other end extends toward the substrate.

[0023] In one embodiment, the excitation branch includes a parasitic connecting segment and a parasitic extension segment;

[0024] One end of the parasitic connecting segment is perpendicular to the plane of the substrate.

[0025] One end of the parasitic extension segment is perpendicular to the other end of the parasitic connection segment, and the other end extends away from the parasitic connection segment.

[0026] In one embodiment, one end of the connecting segment is connected to one end of the first side portion in the substrate, and one end of the parasitic connecting segment is connected to one end of the second side portion in the substrate;

[0027] The length of the extension segment does not exceed the length of the first side portion of the substrate, and the length of the parasitic extension segment does not exceed the length of the second side portion of the substrate.

[0028] In one embodiment, the extension is parallel to a first side of the substrate, and the parasitic extension is parallel to a second side of the substrate;

[0029] Alternatively, the extension segment and the parasitic extension segment can be adjusted to form angles with the first side and the second side of the substrate, respectively.

[0030] In one embodiment, the extended segment and the parasitic extended segment satisfy a perpendicular condition.

[0031] Furthermore, the projection of the extension segment and the parasitic extension segment along the thickness direction of the matrix is ​​located in the matrix.

[0032] In addition, this disclosure also provides an electronic device, which includes a device body and a circularly polarized antenna electrically connected to the device body;

[0033] The circularly polarized antenna includes a substrate, parasitic stubs, and excitation stubs;

[0034] The substrate is provided with an adjustment part for adjusting its own current path;

[0035] The parasitic branch is connected to the first side of the substrate, and the excitation branch is connected to the second side of the substrate. The first side and the second side are two intersecting sides of the substrate.

[0036] The circularly polarized antenna includes a first frequency mode and a second frequency mode;

[0037] In the first frequency mode, the substrate is connected to the parasitic branch and the excitation branch to form a first current path;

[0038] In the second frequency mode, the excitation branch, the substrate, and the parasitic branch are respectively turned on to form a second current path;

[0039] The second current path has a path difference with the first current path, and the path difference can adjust the phase difference between the first current in the first current path and the second current in the second current path.

[0040] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0041] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:

[0042] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0043] Figure 1 A schematic diagram of a first structure of a circularly polarized antenna provided in an embodiment of this disclosure is shown;

[0044] Figure 2 A schematic diagram of a second structure of a circularly polarized antenna provided in an embodiment of this disclosure is shown;

[0045] Figure 3 A schematic diagram of a third structure of a circularly polarized antenna provided in this disclosure embodiment is shown;

[0046] Figure 4 The S-parameter diagram of a circularly polarized antenna provided in an embodiment of this disclosure is shown;

[0047] Figure 5 The current distribution and current path simulation diagram of the first current path in the circularly polarized antenna provided in the embodiments of this disclosure are shown;

[0048] Figure 6 The current distribution and current path simulation diagram of the second current path in the circularly polarized antenna provided in the embodiments of this disclosure are shown;

[0049] Figure 7 An axial ratio diagram of a circularly polarized antenna provided in an embodiment of this disclosure is shown;

[0050] Figure 8 A diagram showing the total radiation efficiency of a circularly polarized antenna provided in an embodiment of this disclosure is illustrated.

[0051] Explanation of the numbers in the diagram: 1. Base; 11. Adjustment part; 111. Plug; 112. Sliding part; 101. First side; 102. Second side;

[0052] 2. Parasitic branch; 21. Feeding point; 22. Connecting segment; 23. Extension segment;

[0053] 3. Encouraging branch; 31. Parasitic connecting segment; 32. Parasitic extension segment. Detailed Implementation

[0054] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0055] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0056] Combination Figure 1 , Figure 5 and Figure 6 As shown, this embodiment of the present disclosure provides a circularly polarized antenna, which includes a base 1, a parasitic stub 2, and an excitation stub 3; the base 1 is provided with an adjustment part 11 for adjusting its own current path; the parasitic stub 2 is connected to a first side 101 of the base 1; the excitation stub 3 is connected to a second side 102 of the base 1; the first side 101 and the second side 102 are two intersecting sides of the base 1;

[0057] The circularly polarized antenna includes a first frequency mode and a second frequency mode. In the first frequency mode, the substrate 1 is connected to the parasitic stub 2 and the excitation stub 3 to form a first current path L1. In the second frequency mode, the excitation stub 3, the substrate 1, and the parasitic stub 2 are connected to form a second current path L2. Figure 1 As shown by multiple consecutive hollow arrows, the adjustment unit 11 partially changes the local structural shape of the substrate 1, thereby correspondingly changing the current conduction path in that local part of the substrate 1. In this way, the second current path L2 in the second frequency mode can form a path difference with the first current path L1 in the first frequency mode, and this path difference can correspondingly adjust the phase difference between the first current in the first current path L1 and the second current in the second current path L2.

[0058] This circularly polarized antenna has a simple and compact structure. It can generate orthogonal currents in the substrate 1 through a single-feed method. Furthermore, the adjustment part 11 in the substrate 1 can change the path difference between the second current path L2 and the first current path L1 to specifically adjust the phase difference of the orthogonal currents. When the phase difference of the orthogonal currents reaches 90 degrees, the corresponding circular polarization performance can be formed. Moreover, since the circularly polarized antenna mainly radiates based on the substrate 1, the radiation efficiency of the circularly polarized antenna is very high, making it particularly suitable as a navigation antenna.

[0059] The circularly polarized antenna provided in this disclosure can be applied, but is not limited to, to various miniaturized wearable electronic devices such as smartwatches and smart bracelets. Due to its compact and small structural design, the circularly polarized antenna can be flexibly adapted and placed inside the housing of miniaturized wearable electronic devices, occupying less internal space. Furthermore, the circularly polarized antenna has excellent circular polarization performance and excellent radiation efficiency, thus enabling it to receive linearly polarized waves of arbitrary orientation. Therefore, it is very suitable as a navigation antenna for miniaturized wearable electronic devices, effectively solving the problem of low signal transmission efficiency caused by ground buildings blocking the signal.

[0060] The following is a specific embodiment, using the circularly polarized antenna applied to a smartwatch as an example to illustrate its usage.

[0061] The circularly polarized antenna may include a base 1, a parasitic stub 2, and an excitation stub 3. The base 1 may be a rectangular plate shaped to conform to the shape of a smartwatch casing, and the first side 101 and the second side 102 may be two adjacent and perpendicularly intersecting sides of the base 1. One end of the parasitic stub 2 may extend perpendicularly to the base 1 along its thickness direction, while the other end is parallel to the first side 101. Similarly, one end of the excitation stub 3 may also extend perpendicularly to the base 1 along its thickness direction, while the other end is parallel to the second side 102.

[0062] Furthermore, since the substrate 1 is also provided with an adjustment part 11 for adjusting its own current path, the adjustment part 11 can be set in a slot in the substrate 1. For example, the adjustment part 11 can be set in the shape of a straight slot, a T-shaped slot, an L-shaped slot, etc. The actual current guiding path of the substrate 1 can be adjusted by the actual size of the adjustment part 11.

[0063] Additionally, when the circularly polarized antenna is in the first frequency mode, i.e. Figure 5 As shown, the resonant frequency of the circularly polarized antenna is 1.655 GHz at this time, and the first current path L1 (i.e. Figure 5 The first current in the trajectory (shown by multiple black arrows) is primarily along the length direction of substrate 1. Figure 5 (in the direction of the red arrow); when the circularly polarized antenna is in the second frequency mode, i.e. Figure 6 As shown, the resonant frequency of the circularly polarized antenna is 1.48 GHz at this time, and the second current path L2 (i.e. Figure 6 The second current in the trajectory (indicated by multiple black arrows) is mainly along the width direction of substrate 1. Figure 6(in the direction of the red arrow in the middle), and the excitation branch 3 corresponds to the excitation to form a second current that can pass through the adjustment section 11 opened in the base 1, and the adjustment section 11 can correspond to the current path L21 that extends the second current path (i.e. Figure 6 The "U"-shaped trajectory formed by the black arrow in the middle) indicates that the current path L21 is the trajectory formed by the current being guided sequentially in the local sidewall of the adjustment part 11 in the substrate 1. This causes a phase difference between the second current path L2 and the first current path L1, resulting in a phase difference between the first frequency mode and the second frequency mode. When the phase difference reaches 90 degrees, the circularly polarized antenna can achieve circular polarization performance, thereby receiving linearly polarized waves of arbitrary orientation and greatly reducing the difficulty of its own installation and alignment. It can also effectively suppress interference signals reflected from buildings, the ground, etc.

[0064] In addition, combined Figure 4 Further detailed explanation: The S-parameter diagram of this circularly polarized antenna clearly shows two resonant points: a first resonant frequency of 1.48 GHz and a second resonant frequency of 1.655 GHz, which includes the GPS frequency of 1.575 GHz. Combined with... Figure 7 To elaborate further, the axial ratio diagram of this circularly polarized antenna shows that the axial ratio at the GPS frequency of 1.575 GHz is less than 3 dB, indicating good circular polarization performance at GPS frequencies. Combined with... Figure 8 Further details can be found in the axial ratio diagram and total radiation efficiency of the circularly polarized antenna. It can be seen that the radiation efficiency of the circularly polarized line is above -1.5dB, indicating that the circularly polarized antenna has excellent radiation performance because it mainly relies on the substrate 1 for radiation.

[0065] Moreover, this circularly polarized antenna uses a single-feed method and does not require offset feeding. By setting parasitic stubs 2 and excitation stubs 3 at the first side 101 and the second side 102 of the substrate 1 respectively, the substrate 1 can form orthogonal currents in the first frequency mode and the second frequency mode. The phase difference of the orthogonal currents in the substrate 1 can be adjusted by controlling the specific opening size of the adjustment part 11 in the substrate 1. When the phase difference of the orthogonal currents reaches 90 degrees, a circularly polarized antenna with corresponding performance can be formed.

[0066] In summary, the circularly polarized antenna provided in this embodiment has a simple and compact structure. It can generate orthogonal currents in the substrate 1 using a single-feed method, and the phase difference of the orthogonal currents can be specifically adjusted by the adjustment part 11 in the substrate 1, so that the phase of the orthogonal currents can reach 90 degrees, thus achieving circular polarization. Furthermore, the parasitic stub 2 and excitation stub 3 in this circularly polarized antenna are simply designed and very easy to adjust. Since the circularly polarized antenna mainly radiates based on the substrate 1, its radiation efficiency is very high, making it particularly suitable for navigation antennas in miniaturized wearable electronic devices.

[0067] In one embodiment, the adjustment part 11 includes an opening slit formed in the substrate 1; the opening end of the opening slit is formed in the first side portion 101 of the substrate 1 where the parasitic branch 2 is provided, and the bottom end of the opening slit extends toward the interior of the substrate 1.

[0068] For example, combining Figure 1 and Figure 6 In further detail, the adjustment part 11 is specifically configured as an opening slit in the base 1. The opening slit can be configured as a straight groove slit that runs through the thickness direction of the base 1. The length of the opening slit can be configured to be perpendicular to the first side 101. The opening end of the opening slit can be located at the center or near the center of the first side 101. The bottom end of the opening slit extends toward the interior of the base 1, and can extend to the interior center or near the center of the base 1.

[0069] In addition, the length of the opening can be set to be perpendicular to the first side 101, so that the current (i.e., the current conducted on the two long sides of the opening) can be... Figure 6 In the current path L21, the two segments in opposite directions of the "U"-shaped trajectory can cancel each other out in two opposite directions, thereby avoiding the opening gap from affecting the current component flowing in the direction of the first side 101.

[0070] The adjustment part 11 is specifically configured as the opening slit mentioned above. It has a simple structure and can be directly manufactured in the substrate 1 by stamping, which simplifies the manufacturing process of the circularly polarized antenna and reduces the production cost of the circularly polarized antenna.

[0071] Moreover, the dimensional parameters such as the gap length and gap width of the opening can be flexibly adapted and adjusted according to the actual size of the substrate 1. In this way, by opening openings with different dimensional parameters, the beneficial effect of flexibly adjusting the path difference between the second current path L2 and the first current path L1 can be achieved.

[0072] It is also worth noting that the aforementioned adjustment part 11 can be configured in other ways. For example, a local part of the substrate 1 can be insulated, and the resulting "insulated part" becomes the adjustment part 11. In this case, the "insulated part" will not conduct current, which will also allow the current to flow in the substrate 1 in a U-shaped avoidance path. This will also enable the adjustment of the path difference between the second current path and the first current path and the control of the phase difference of the orthogonal currents in the substrate 1.

[0073] Of course, the adjustment part 11 described above can also be configured as other types of opening seams, such as, but not limited to, T-shaped groove seams, L-shaped groove seams, etc.

[0074] It is understood that this application does not limit the setting method of the adjustment part 11. That is, those skilled in the art can set and adjust it according to the actual situation. The above situation is only an illustrative description of how the adjustment part 11 can be implemented in this application, but it is not limited to the situation described in the above embodiments.

[0075] In one embodiment, a plug 111 electrically connected to the substrate 1 is provided at the bottom of the opening slit; the opening slit can reduce its opening length in the substrate 1 by filling it with the plug 111, thereby adjusting the phase difference between the first current and the second current in the substrate 1.

[0076] For example, combining Figure 2 In further detail, a plug 111 electrically connected to the substrate 1 is provided at the bottom end of the opening. The plug 111 can be, but is not limited to, a sheet-like shape with the same width as the opening and the same thickness as the substrate 1. Multiple plugs 111 can be arranged side-by-side along the length of the opening. Thus, when the effective opening length of the opening needs to be adjusted according to different operating conditions, several plugs 111 can be sequentially inserted at the bottom end of the opening, thereby reducing the effective opening length of the opening. Figure 2 The path S0, indicated by the dashed arrow, represents the current flow path in the opening gap when the plug 111 is not installed. Figure 2 The path S1 shown by the multiple hollow heads represents the current guiding path in the opening gap when several plugs 111 are set in the opening gap. By comparing the two, it can be seen that the path difference between path S0 and path S1 can be changed by changing the number of plugs 111. This allows the adjustment unit 11 to flexibly adjust the actual path difference between the second current path and the first current path in the circularly polarized antenna, that is, to adjust the phase difference between the first current in the first current path and the second current in the second current path.

[0077] It is also worth noting that the size of the opening slot can be determined simultaneously with the substrate 1 during the fabrication process. However, when the circularly polarized antenna is actually applied to different scenarios, it may be necessary to adjust the phase difference between the first current in the first current path and the second current in the second current path according to the actual usage requirements (for example, the phase difference may need to be adjusted to 60°, 120°, etc.). This can be achieved by inserting different numbers of inserting parts 111 into the opening slot.

[0078] Of course, in order to ensure the stability of the electrical connection between the plug 111 and the substrate 1 in the opening, the plug 111 can be configured to have an interference fit with the opening, and the plug 111 can be made of a copper alloy material with good conductivity and a certain degree of elastic deformation.

[0079] It is understood that this application does not limit the way the plug 111 is set, that is, those skilled in the art can set and adjust it according to the actual situation. The above situation is only an illustrative description of how the plug 111 can be implemented in this application, but it is not limited to the situation described in the above embodiments.

[0080] In one embodiment, a sliding member 112 electrically connected to the substrate 1 is movably disposed in the opening; the sliding member 112 electrically connects the two sides of the opening along the width direction of the opening, and the sliding member 112 can slide back and forth along the length direction of the opening to adjust the length of the first current path and the second current path.

[0081] For example, combining Figure 3 In further detail, a sliding member 112, electrically connected to the substrate 1, is provided at the bottom end of the opening. The sliding member 112 can, but is not limited to, be a round rod with the same width as the opening and the same thickness as the substrate 1. Limiting grooves can be correspondingly formed in two opposite sidewalls along the length of the opening, and the two ends of the sliding member 112 are respectively slidably inserted into the two limiting grooves. Thus, when the effective opening length of the opening needs to be adjusted according to different operating conditions, the actual position of the sliding member 112 in the opening can be adjusted accordingly, allowing the current in the substrate 1 to be conducted through the sliding member 112. Figure 3 The path S0, indicated by the dashed arrow, represents the current flow path at the bottom of the sliding guide 112 within the opening gap. Figure 2 The path S1 shown by the multiple hollow heads represents the flow path of the slider 112 sliding into the opening slit. By comparing the two, it can be seen that the path difference between path S0 and path S1 can be changed by changing the position of the slider 112 in the opening slit.

[0082] By partially "short-circuiting" the opening slot, the effective opening length of the opening slot is reduced, ultimately enabling the adjustment unit 11 to flexibly adjust the actual path difference between the second current path and the first current path in the circularly polarized antenna, that is, to adjust the phase difference between the first current in the first current path and the second current in the second current path.

[0083] It is also worth noting that the size of the opening slot can be determined simultaneously with the substrate 1 during the fabrication process. However, when the circularly polarized antenna is actually applied to different scenarios, it may be necessary to adjust the phase difference between the first current in the first current path and the second current in the second current path according to the actual usage requirements (for example, the phase difference may need to be adjusted to 60°, 120°, etc.). This can be achieved by sliding the position of the slider 112 in the opening slot.

[0084] The slider 112 and the plug 111 mentioned above are adjusted in two different ways, but both can change the current path at the opening in the substrate 1. The two can be flexibly selected and set according to different usage scenarios.

[0085] Of course, in order to ensure the stability of the electrical connection between the sliding member 112 and the base 1 in the opening, the sliding member 112 can be configured as a telescopic round rod with elastic telescopic function. A compression spring is correspondingly provided in the sliding member 112. The elastic force of the compression spring makes the sliding member 112 always have a tendency to extend to both ends, thereby ensuring that the sliding member 112 can stably make conductive contact with the two opposite side walls of the opening. Moreover, the sliding member 112 can be made of copper alloy material with good conductivity and a certain elastic deformation.

[0086] It is understood that this application does not limit the setting method of the slider 112, that is, those skilled in the art can set and adjust it according to the actual situation. The above situation is only an illustrative description of how the slider 112 can be implemented in this application, but it is not limited to the situation described in the above embodiments.

[0087] In one embodiment, the parasitic branch 2 includes a feed point 21, a connecting segment 22, and an extension segment 23; one end of the connecting segment 22 is perpendicular to the plane of the base 1; the extension segment 23 is perpendicular to the other end of the connecting segment 22, and the other end extends along the direction of the first side 101; one end of the feed point 21 is connected to the extension segment 23, and the other end extends toward the base 1.

[0088] For example, combining Figure 1In further detail, the parasitic stub 2, consisting of the feed point 21, the connecting section 22, and the extension section 23, are connected to form a horizontally oriented "F"-shaped structure. One end of the connecting section 22 is perpendicular to the plane of the base 1, and the other end of the extension section 23 is perpendicular to the connecting section 22, extending along the direction of the first side 101. Thus, the parasitic stub 2 is essentially positioned in a vertical plane perpendicular to the base 1. This provides sufficient clearance above the base 1, while the parasitic stub 2 occupies only a narrow vertical "gap" in the vertical direction, making the circularly polarized antenna structure more compact and better suited for installation in miniaturized wearable electronic devices.

[0089] Furthermore, one end of the feed point 21 is connected to the extension section 23, and the other end extends towards the base 1. The feed point 21 as a whole can be parallel to the connecting section 22. As the feed point of the circularly polarized antenna, the feed point 21 is the only channel for the mutual conversion of electromagnetic energy and circuit energy of the circularly polarized antenna. The feed point 21 receives high-frequency alternating current transmitted from the transmitter (through the feed line) and converts the current energy into electromagnetic wave energy radiated into space through the circularly polarized antenna. The placement of the feed point 21 in the parasitic stub 2 needs to match the characteristic impedance of the transmitter connection (feed line) and also needs to meet the resonant frequency of the parasitic stub 2 through tuning. This ensures the excellent radiation efficiency and bandwidth required for the operation of the circularly polarized antenna.

[0090] Furthermore, the feed point 21 can be arranged parallel to the connecting section 22 in the same direction, so that the feed point 21 further utilizes the "gap space" between the parasitic stub 2 and the substrate 1, without occupying additional space, and can further improve the structural compactness of the circularly polarized antenna and reduce the installation footprint.

[0091] In one embodiment, the excitation branch 3 includes a parasitic connection segment 31 and a parasitic extension segment 32; one end of the parasitic connection segment 31 is perpendicular to the plane of the substrate 1; one end of the parasitic extension segment 32 is perpendicular to the other end of the parasitic connection segment 31, and the other end extends away from the parasitic connection segment 31.

[0092] For example, combining Figure 1In further detail, the parasitic connecting segment 31 and the parasitic extension segment 32 in the excitation stub 3 are connected to form a structure similar to a horizontal "L". One end of the parasitic connecting segment 31 is perpendicular to the plane of the base 1, and one end of the parasitic extension segment 32 is perpendicular to the other end of the parasitic connecting segment 31. The other end extends away from the parasitic connecting segment 31. In this way, the excitation stub 3 as a whole is also set in a vertical plane perpendicular to the base 1. On the one hand, it can also give enough clearance space above the base 1. On the other hand, the excitation stub 3 as a whole occupies a narrow vertical "gap" space in the vertical direction, which can also make the circularly polarized antenna structure more compact and better installed in miniaturized wearable electronic devices.

[0093] In one embodiment, one end of the connecting segment 22 is connected to one end of the first side portion 101 in the substrate 1, and one end of the parasitic connecting segment 31 is connected to one end of the second side portion 102 in the substrate 1; the length of the extension segment 23 does not exceed the length of the first side portion 101 in the substrate 1, and the length of the parasitic extension segment 32 does not exceed the length of the second side portion 102 in the substrate 1.

[0094] For example, combining Figure 1 In further detail, one end of the connecting segment 22 is connected to one end of the first side portion 101 in the base 1, and one end of the parasitic connecting segment 31 is connected to one end of the second side portion 102 in the base 1. At this time, the end of the parasitic branch 2 can correspond to the head of the excitation branch 3, and the parasitic branch 2 and the excitation branch 3 together satisfy the spatial perpendicularity condition, forming a more compact spatial structure shape with the base 1. This allows the circularly polarized antenna to be better installed and applied in miniaturized wearable electronic devices with limited internal space.

[0095] In one embodiment, the extension 23 is parallel to the first side 101 of the substrate 1, and the parasitic extension 32 is parallel to the second side 102 of the substrate 1.

[0096] For example, combining Figure 1 To explain in more detail, the extension segment 23 of the parasitic branch 2 is arranged parallel to the first side 101 of the substrate 1, and the parasitic extension segment 32 of the excitation branch 3 is arranged parallel to the second side 102 of the substrate 1. In this way, the entire segment of the extension segment 23 can always maintain an equal distance from the first side 101 of the substrate 1, and the entire segment of the parasitic extension segment 32 can always maintain an equal distance from the second side 102 of the substrate 1, so that the parasitic branch 2 and the excitation branch 3 can cooperate with the substrate 1 to form good polarization characteristics.

[0097] In one embodiment, the extension 23 and the parasitic extension 32 can be adjusted to form angles with the first side 101 and the second side 102 in the substrate 1, respectively.

[0098] Alternatively, the angle between the extension segment 23 in the parasitic branch 2 and the first side 101 of the substrate 1 can be adjusted, and the angle between the parasitic extension segment 32 in the excitation branch 3 and the second side 102 of the substrate 1 can be adjusted. This allows the circularly polarized antenna to be flexibly adapted and adjusted in various installation scenarios, more flexibly changing the current path and distribution formed with the substrate 1, and more flexibly adjusting the radiation direction and polarization characteristics of the circularly polarized antenna.

[0099] In one embodiment, the extension 23 and the parasitic extension 32 satisfy the perpendicular condition, and the projections of the extension 23 and the parasitic extension 32 along the thickness direction of the substrate 1 are located in the substrate 1.

[0100] For example, combining Figure 1 In further detail, the extension segment 23 and the parasitic extension segment 32 are configured to satisfy the condition of spatial perpendicularity, and the projections of the extension segment 23 and the parasitic extension segment 32 along the thickness direction of the substrate 1 are both located in the substrate 1. In this way, along the thickness direction of the substrate 1, the extension segment 23 and the parasitic extension segment 32 will not exceed the length and width range of the substrate 1. Therefore, when the circularly polarized antenna is installed in a miniaturized wearable electronic device, as long as the substrate 1 does not exceed the housing space of the wearable electronic device, it can be ensured that the parasitic stub 2 and the excitation stub 3 will not exceed the housing space. This also enables the circularly polarized antenna to be better installed and applied in miniaturized wearable electronic devices with limited internal space.

[0101] In addition, this disclosure also provides an electronic device, which includes a device body and a circularly polarized antenna electrically connected to the device body; the circularly polarized antenna includes a base 1, in which an adjustment part 11 for adjusting its own current path is provided; the circularly polarized antenna also includes a parasitic branch 2 connected to a first side 101 in the base 1, and an excitation branch 3 connected to a second side 102 in the base 1, wherein the first side 101 and the second side 102 are two intersecting sides in the base 1;

[0102] The circularly polarized antenna includes a first frequency mode and a second frequency mode. In the first frequency mode, the substrate 1 is connected to the parasitic stub 2 and the excitation stub 3 to form a first current path. In the second frequency mode, the excitation stub 3, the substrate 1, and the parasitic stub 2 are connected to form a second current path. The second current path has a path difference from the first current path, and the path difference can adjust the phase difference between the first current in the first current path and the second current in the second current path.

[0103] The electronic device can be, but is not limited to, miniaturized wearable electronic devices such as smartwatches, smart bracelets, and smart wristbands. Since the electronic device includes the aforementioned circularly polarized antenna, it can achieve the advantages of excellent circular polarization performance and excellent radiation efficiency of the aforementioned circularly polarized antenna. Furthermore, the electronic device can receive linearly polarized waves of arbitrary orientation through the circularly polarized antenna, thus effectively solving the problem of low signal transmission of electronic devices due to ground building obstruction.

[0104] Since the electronic device provided in this application includes the above-mentioned circularly polarized antenna, the previous embodiments are also applicable to the electronic device provided in this embodiment. The structure of the circularly polarized antenna and the corresponding beneficial effects provided in the previous embodiments will not be described in detail here.

[0105] 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 indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise expressly defined.

[0106] The above description is merely an embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A circularly polarized antenna, comprising: A substrate, wherein an adjustment part for adjusting its own current path is provided in the substrate; Parasitic branches are attached to the first edge of the substrate; An excitation branch is connected to the second side of the base, wherein the first side and the second side are two intersecting sides of the base; The circularly polarized antenna includes a first frequency mode and a second frequency mode; In the first frequency mode, the substrate is connected to the parasitic branch and the excitation branch to form a first current path; In the second frequency mode, the excitation branch, the substrate, and the parasitic branch are respectively turned on to form a second current path; The second current path has a path difference with the first current path, and the path difference can adjust the phase difference between the first current in the first current path and the second current in the second current path.

2. The circularly polarized antenna according to claim 1, wherein the adjustment part includes an opening slot formed in the substrate; The opening end of the slit is formed in the first side of the substrate where the parasitic branch is located, and the bottom end of the slit extends toward the interior of the substrate.

3. The circularly polarized antenna according to claim 2, wherein a plug that is electrically connected to the substrate is provided at the bottom end of the opening slot; The opening slit can be filled by the plug to reduce its own slit length in the substrate, thereby adjusting the phase difference between the first current and the second current in the substrate.

4. The circularly polarized antenna according to claim 2, wherein a sliding member electrically connected to the substrate is movably disposed in the opening slot; The slider electrically connects the two sides of the opening along the width direction of the opening, and the slider can slide back and forth along the length direction of the opening to adjust the length of the first current path and the second current path.

5. The circularly polarized antenna according to claim 1, wherein the parasitic stub comprises: The connecting segment has one end perpendicular to the plane of the base body. The extension segment is perpendicular to the other end of the connecting segment, and the other end extends along the direction of the first side. The feed point is connected to the extension section at one end and extends toward the substrate at the other end.

6. The circularly polarized antenna according to claim 5, wherein the excitation stub comprises: The parasitic connecting segment has one end perpendicular to the plane of the substrate. The parasitic extension segment has one end perpendicular to the other end of the parasitic connection segment, and the other end extends away from the parasitic connection segment.

7. The circularly polarized antenna according to claim 6, wherein one end of the connecting segment is connected to one end of the first side portion in the substrate, and one end of the parasitic connecting segment is connected to one end of the second side portion in the substrate; The length of the extension segment does not exceed the length of the first side portion of the substrate, and the length of the parasitic extension segment does not exceed the length of the second side portion of the substrate.

8. The circularly polarized antenna according to claim 7, wherein the extension is parallel to the first side of the substrate, and the parasitic extension is parallel to the second side of the substrate; Alternatively, the extension segment and the parasitic extension segment can be adjusted to form angles with the first side and the second side of the substrate, respectively.

9. The circularly polarized antenna according to claim 7, wherein the extension segment and the parasitic extension segment satisfy a perpendicular condition, and the projections of the extension segment and the parasitic extension segment along the thickness direction of the substrate are located in the substrate.

10. An electronic device, comprising a device body and a circularly polarized antenna electrically connected to the device body; The circularly polarized antenna includes a substrate, parasitic stubs, and excitation stubs; The substrate is provided with an adjustment part for adjusting its own current path; The parasitic branch is connected to the first side of the substrate, and the excitation branch is connected to the second side of the substrate. The first side and the second side are two intersecting sides of the substrate. in, The circularly polarized antenna includes a first frequency mode and a second frequency mode; In the first frequency mode, the substrate is connected to the parasitic branch and the excitation branch to form a first current path; In the second frequency mode, the excitation branch, the substrate, and the parasitic branch are respectively turned on to form a second current path; The second current path has a path difference with the first current path, and the path difference can adjust the phase difference between the first current in the first current path and the second current in the second current path.

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