Antenna and communication equipment

Abstract

The utility model relates to an antenna and communication equipment. The antenna includes a substrate. The substrate has an unfolded state and a folded state. And the impedance of the antenna when the substrate is in the unfolded state is different from that of the antenna when the substrate is in the folded state. Therefore, the impedance of the antenna can be changed by adjusting the state of the substrate so as to adapt to the change of an application scene, and the antenna keeps a good communication effect.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to an antenna and communication device. Background Technology

[0002] With the rapid development of wireless communication technology, various communication terminal antenna devices have been proposed and used. In these technologies, the operating frequency band of the antenna is usually fixed, meaning that an antenna can only be used in a specific scenario. If the application scenario of the antenna changes or there is interference from other radio frequency devices, the communication performance of the antenna will be affected, thus limiting the performance of the entire communication system. Utility Model Content

[0003] This application provides an antenna and a communication device, which can adjust the impedance of the antenna by switching the state of the substrate, so that the antenna can meet the changes in application scenarios, thereby at least partially solving the above-mentioned technical problems.

[0004] To achieve the above objectives, according to a first aspect of this application, an antenna is provided, comprising:

[0005] The substrate has an unfolded state and a folded state. The impedance of the antenna is different when the substrate is in the unfolded state compared to when the substrate is in the folded state.

[0006] Optionally, the operating frequency band of the antenna when the substrate is in the unfolded state is different from the operating frequency band of the antenna when the substrate is in the folded state.

[0007] Optionally, the maximum radiation direction of the antenna when the substrate is in the unfolded state is different from the maximum radiation direction of the antenna when the substrate is in the folded state.

[0008] Optionally, the substrate includes:

[0009] Main body;

[0010] A folding section is foldably connected to the main body.

[0011] When the substrate is in the unfolded state, the main body and the folding part are horizontally connected; when the substrate is in the folded state, the main body and the folding part are angularly connected.

[0012] Optionally, when the substrate is in a folded state, the main body portion is perpendicularly connected to the folded portion.

[0013] Optionally, the antenna further includes a radiator disposed on the surface of the substrate, wherein the radiator includes a feed line portion configured to connect to a feed pin of an adapter, and the feed line portion tapers along the direction from the main body portion to the folded portion.

[0014] Optionally, the radiator further includes a helical radiating section connected to the feed line section, the helical radiating section being configured to receive / transmit radiated signals.

[0015] Optionally, the spiral radiating section includes a first spiral radiating stub and a second spiral radiating stub, the first spiral radiating stub and the second spiral radiating stub are respectively located on opposite sides of the feed line section, and the first spiral radiating stub and the second spiral radiating stub have opposite bending directions.

[0016] Optionally, the radiator further includes a first matching stub, which is connected to the feed line portion.

[0017] Optionally, the first matching branch is set at an angle to the feed line portion, and the first matching branch extends in the direction of the first spiral radiating branch or the second spiral radiating branch, wherein the angle between the first matching branch and the feed line portion is θ, satisfying that θ is an obtuse angle.

[0018] Optionally, the radiator further includes a second matching branch, which is connected to either the first helical radiating branch or the second helical radiating branch.

[0019] Optionally, the extension length of the first spiral radial branch is A, and the extension length of the second spiral radial branch is B, satisfying: A > B, wherein the second matching branch is connected to the first spiral radial branch.

[0020] Optionally, the radiator further includes a grounding portion disposed on the main body portion, the grounding portion being configured to connect to the grounding pin of the adapter.

[0021] Optionally, the substrate has a crease that divides the substrate into the main body and the folded portion, wherein the grounding portion has a proximal edge near the crease, and the crease is arranged parallel to the proximal edge.

[0022] Optionally, the distance between the crease and the adjacent edge is D, satisfying: 0≤D≤2 mm.

[0023] According to a second aspect of this application, a communication device is provided, including the aforementioned antenna.

[0024] In the antenna and communication device of this application embodiment, by having the substrate in an unfolded state and a folded state, the impedance of the antenna is different in the unfolded state and the folded state. Therefore, the impedance of the antenna can be changed by adjusting the state of the substrate to adapt to changes in the application scenario and to maintain good communication performance of the antenna.

[0025] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0028] Figure 1 This is a schematic diagram of the antenna structure when the substrate is in the unfolded state in an exemplary embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the antenna structure when the substrate is in a folded state in an exemplary embodiment of this application;

[0030] Figure 3 This is a schematic diagram showing the dimensions of each structure of the antenna when the substrate is in the unfolded state in an exemplary embodiment of this application;

[0031] Figure 4 This is a reflection curve diagram of the antenna provided in an exemplary embodiment of this application;

[0032] Figure 5 This is a reflection curve diagram of the antenna provided in the exemplary embodiment of this application at different folding angles;

[0033] Figure 6 This is the radiation pattern of the antenna when the substrate is in the unfolded state in an exemplary embodiment of this application, at a resonant point of 2.4 GHz;

[0034] Figure 7 This is the radiation pattern of the antenna at a resonant point of 5.8 GHz when the substrate is in an unfolded state in an exemplary embodiment of this application;

[0035] Figure 8 This is the radiation pattern of the antenna at a resonant point of 2.4 GHz when the substrate is in a folded state in an exemplary embodiment of this application.

[0036] Figure 9 This is the radiation pattern of the antenna at a resonant point of 5.8 GHz when the substrate is in a folded state in an exemplary embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Substrate; 11. Main body; 12. Folded part; 13. Crease;

[0039] 2. Radiator; 21. Feeder section; 22. Helical radiator section; 221. First helical radiator branch; 222. Second helical radiator branch; 23. First matching branch; 24. Second matching branch; 25. Grounding section; 251. Near the edge. Detailed Implementation

[0040] The technical solutions of the embodiments of this application 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 application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0041] According to a first aspect of this application, an embodiment of this application provides an antenna. The antenna includes a substrate 1. The substrate 1 has an unfolded state and a folded state. The impedance of the antenna is different when the substrate 1 is in the unfolded state compared to the impedance of the antenna when the substrate 1 is in the folded state.

[0042] In this embodiment, by having the substrate 1 in an unfolded state and a folded state, the impedance of the antenna is different in the unfolded state and the folded state. Therefore, the impedance of the antenna can be changed by adjusting the state of the substrate 1 to adapt to changes in the application scenario and to maintain good communication performance of the antenna.

[0043] In this embodiment, the impedance of the antenna is changed by switching the state of the substrate 1, thereby realizing the switching of the antenna's working state. This can improve the performance of the communication equipment and reduce the requirements of the communication equipment for the number, cost and size of antennas.

[0044] like Figure 4 As shown, the reflection coefficient (S11) of the antenna when substrate 1 is in the unfolded state is greater than that when substrate 1 is in the folded state. This indicates that the impedance matching of the antenna has changed; that is, the antenna impedance has been altered by the folding mechanism.

[0045] In some embodiments, substrate 1 is made of flexible wood pulp paper. Wood pulp paper includes, but is not limited to, A4 paper, label stickers, book covers, and color printing paper. The dielectric constant of wood pulp paper is typically 2.31. In this embodiment, substrate 1 is manufactured using wood pulp paper as the raw material, giving it advantages such as low cost and ease of manufacture. Of course, substrate 1 can also be made of other flexible dielectric materials. For example, substrate 1 can also be made of polyester resin, polystyrene, etc. The dielectric constant of substrate 1 made of polyester resin is typically in the range of 3.0 to 3.8. The dielectric constant of substrate 1 made of polystyrene is typically in the range of 2.45 to 2.65.

[0046] In some embodiments, the thickness of substrate 1 is set to 0.1 mm. Since the thickness of substrate 1 affects the antenna's radiation bandwidth, resonant frequency, gain, and radiation efficiency, setting the thickness of substrate 1 to 0.1 mm enables the antenna to operate in the WLAN band.

[0047] like Figure 3 As shown, the length of substrate 1 is a, and the height is H1. Where a = 40 mm and H1 = 52 mm.

[0048] In some embodiments, the operating frequency band of the antenna when the substrate 1 is in the unfolded state is different from the operating frequency band of the antenna when the substrate 1 is in the folded state.

[0049] In this embodiment, by having the substrate 1 in an unfolded state and a folded state, the antenna operates at different frequency bands in the unfolded and folded states. Thus, the operating frequency band of the antenna can be changed by adjusting the state of the substrate 1 to adapt to changes in the application scenario and maintain good communication performance of the antenna.

[0050] In this embodiment, the antenna's operating frequency band is changed by switching the state of substrate 1, thereby realizing the switching of the antenna's operating state. This can improve the performance of the communication equipment and reduce the communication equipment's requirements for the number, cost, and size of antennas.

[0051] like Figure 1 As shown, when substrate 1 is in the unfolded state, the antenna is in a two-dimensional planar state. At this time, the antenna's operating frequency band can be 2.37GHz–2.52GHz and 5.65GHz–6.17GHz, with operating bandwidths of 150MHz and 520MHz respectively, to ensure the antenna meets the operating requirements of the WLAN band. Figure 2As shown, when substrate 1 is in a folded state, the antenna is in a three-dimensional state. At this time, the antenna can operate in the frequency bands of 2.40GHz to 2.55GHz and 5.78GHz to 6.50GHz, with operating bandwidths of 150MHz and 720MHz, respectively. The operating bandwidth of substrate 1 in the folded state is wider than that of substrate 1 in the unfolded state, and the antenna can meet the operating requirements of the WLAN frequency band.

[0052] like Figures 6 to 9 As shown, in some embodiments, the maximum radiation direction of the antenna when the substrate 1 is in the unfolded state is different from the maximum radiation direction of the antenna when the substrate 1 is in the folded state.

[0053] In this embodiment, by having the substrate 1 in an unfolded state and a folded state, the maximum radiation direction of the antenna is different in the unfolded state and the folded state. Therefore, the maximum radiation direction of the antenna can be changed by adjusting the state of the substrate 1 to adapt to changes in the application scenario and to maintain good communication performance of the antenna.

[0054] In this embodiment, the maximum radiation direction segment of the antenna is changed by switching the state of the substrate 1, thereby realizing the switching of the antenna's working state. This can improve the performance of the communication equipment and reduce the requirements of the communication equipment for the number, cost and size of antennas.

[0055] Figure 6 The radiation pattern of the antenna at a resonant point of 2.4 GHz is shown when substrate 1 is in the unfolded state. Figure 6 As shown, when the substrate 1 is in the unfolded state and the antenna is operating at 2.4 GHz, the antenna radiates bidirectionally in both the yoz and xoy planes, with the maximum radiation directions in the positive and negative z-axis directions and a maximum gain of 3.48 dBi. Figure 7 The radiation pattern of the antenna at a resonant point of 5.8 GHz is shown when substrate 1 is in its unfolded state. Figure 7 As shown, when the substrate 1 is in the unfolded state and the antenna is operating at 5.8 GHz, the maximum radiation direction is 15° off the x-axis from the y-axis, and the maximum gain is 2.26 dBi. Figure 8 The radiation pattern of the antenna at a resonant point of 2.4 GHz is shown when the substrate 1 is in a folded state (the main body 11 is perpendicular to the folded part 12). Figure 8 As shown, when the substrate 1 is in a folded state and the antenna operates at 2.4 GHz, it radiates unidirectionally in both the yoz and xoy planes, with the maximum radiation direction in the positive y-axis direction, i.e., in the direction perpendicular to the folded surface, and the maximum gain is 3.65 dBi. Figure 9 The radiation pattern of the antenna at a resonant point of 5.8 GHz is shown when the substrate 1 is in a folded state (the main body 11 is perpendicular to the folded portion 12). Figure 9As shown, when substrate 1 is in a folded state and the antenna is operating at 5.8 GHz, the maximum radiation direction is 15° off the x-axis from the y-axis, and the maximum gain is 3.91 dBi.

[0056] It can be seen that when the substrate 1 switches between the unfolded state and the folded state, it can not only adjust the frequency response range of the antenna, but also adjust the radiation direction of the antenna, so as to realize the reconfigurability of the antenna pattern.

[0057] like Figure 1 and Figure 2 As shown, in some embodiments, the substrate 1 includes a main body 11 and a folded portion 12. The folded portion 12 is foldably connected to the main body 11. When the substrate 1 is in the unfolded state, the main body 11 and the folded portion 12 are horizontally connected. When the substrate 1 is in the folded state, the main body 11 and the folded portion 12 are angularly connected.

[0058] It is understood that the folding part 12 can be folded along its connection with the main body part 11, so that the substrate 1 can switch states through the action of the folding part 12.

[0059] In some embodiments, the substrate 1 can be switched between an unfolded state and a folded state by manual folding and mechanical folding. For example, an operator manually operates the folding part 12 to switch the folding part 12 from a state horizontally connected to the main body 11 to a state angularly connected to the main body 11, thereby switching the substrate 1 from an unfolded state to a folded state. Alternatively, a robotic arm can mechanically operate the folding part 12 to switch the folding part 12 from a state angularly connected to the main body 11 to a state horizontally connected to the main body 11, thereby switching the substrate 1 from a folded state to an unfolded state.

[0060] In some embodiments, when the substrate 1 is in a folded state, the main body 11 and the folding portion 12 are arranged at an acute angle. For example, the included angle between the main body 11 and the folding portion 12 is 30° or 60°.

[0061] In some embodiments, when the substrate 1 is in a folded state, the main body 11 and the folding portion 12 are arranged at an obtuse angle. For example, the included angle between the main body 11 and the folding portion 12 is 120° or 150°.

[0062] In some embodiments, when the substrate 1 is in a folded state, the main body 11 is vertically connected to the folded portion 12.

[0063] like Figure 5As shown, when the substrate 1 is in the unfolded state and in folded states at different angles, as the angle between the main body 11 and the folded portion 12 increases, the impedance matching of the antenna at 2.4 GHz and 5.8 GHz first deteriorates and then improves, and the radiation bandwidth first shifts to lower frequencies and then to higher frequencies. When the main body 11 and the folded portion 12 are perpendicularly connected, the impedance bandwidth below -10 dB is the widest.

[0064] Understandably, due to the change in the angle between the main body 11 and the folded portion 12, the coupling relationship between the spiral radiating portion 22 and the grounding portion 25 will change accordingly, thereby generating different radiation modes and changing the operating frequency band of the antenna. When the main body 11 and the folded portion 12 are connected perpendicularly, the impedance bandwidth of the antenna is maximized.

[0065] In some embodiments, the antenna further includes a radiator 2. The radiator 2 is disposed on the surface of the substrate 1. The radiator 2 includes a feed line portion 21. The feed line portion 21 is configured to connect to the feed pin of the adapter. The feed line portion 21 is tapered in the direction from the main body portion 11 to the folded portion 12.

[0066] It is understandable that the radiator 2 can receive and emit radiated signals. The feed line 21 can perform signal transmission, impedance matching, and other functions. By making the feed line 21 taper in the direction from the main body 11 to the folded part 12, the impedance matching effect of the feed line 21 is improved.

[0067] In some embodiments, the radiator 2 is made of conductive silver paste to give it a conductivity of 6.3012e+07 S / m (Siemens per meter). The radiator 2 is fed in the form of a coplanar waveguide to generate effective radiated signals at 2.4 GHz and 5.8 GHz.

[0068] In some embodiments, the thickness of the radiator 2 can be set to 18 micrometers.

[0069] like Figure 3 As shown, the feed line portion 21 extends from the main body portion 11 to the folded portion 12. At the end of the main body portion 11 away from the folded portion 12, the width of the feed line portion 21 is W1, and at the other end, the width is W2. Wherein, W1 = 4 mm and W2 = 3 mm.

[0070] In some embodiments, the extension length of the power supply section is H3, where H3 = 31 mm.

[0071] In some embodiments, the radiator 2 further includes a helical radiating section 22, which is connected to the feed line section 21 and is configured to receive / transmit radiated signals.

[0072] It is understandable that the spiral radiating part 22 can be used to receive and / or transmit high-frequency radiated signals and low-frequency radiated signals, thereby realizing the signal transmission and reception function of the antenna.

[0073] In some embodiments, the spiral radiating section 22 includes a first spiral radiating branch 221 and a second spiral radiating branch 222, which are located on opposite sides of the feeder section 21, and the first spiral radiating branch 221 and the second spiral radiating branch 222 have opposite bending directions.

[0074] It is understood that the first helical radiating stub 221 and the second helical radiating stub 222 are located on opposite sides of the feed line section 21, and the bending directions of the first helical radiating stub 221 and the second helical radiating stub 222 are opposite, so as to increase the signal transmission and reception range of the antenna and optimize the radiation pattern of the antenna.

[0075] For example, the first helical radiating branch 221 bends counterclockwise, and the first helical radiating branch 221 moves away from the feed section and then moves closer to the feed section. The second helical radiating branch 222 bends clockwise, and the second helical radiating branch 222 moves away from the feed section and then moves closer to the feed section.

[0076] In some embodiments, the first helical radiating branch 221 and the second helical radiating branch 222 have the same width.

[0077] In some embodiments, the radiator 2 further includes a first matching stub 23 connected to the feed line 21, and the first matching stub 23 is configured to optimize the impedance matching of the antenna in a first operating frequency band.

[0078] Understandably, by connecting the first matching stub 23 to the feeder section 21, the first matching stub 23 can optimize the load at the transmission line termination, making the characteristic impedance of the matched load at the transmission line termination infinitely close to the characteristic impedance of the entire transmission line. According to transmission line theory, when the transmission line termination is connected to a load equal to its characteristic impedance, only traveling waves exist on the transmission line, resulting in the highest radiation efficiency and the best impedance matching. That is, the standing wave ratio is 1, the return loss is negative infinity, and the reflection coefficient is minimal.

[0079] In some embodiments, the first operating frequency band is the 2.4 GHz band. Specifically, the first matching stub 23 can optimize the impedance matching of the antenna at the 2.4 GHz frequency point, thereby enabling the impedance matching of the antenna in the 2.4 GHz band to be adaptively optimized.

[0080] In some embodiments, the first matching branch 23 is configured as an ellipse. For example... Figure 3As shown, the minor radius of the elliptical first matching branch 23 is R2, and the major radius is R3. Wherein, R2 = 1 mm, and R3 = 4.7 mm. When the substrate 1 is in the unfolded state, the distance between the center of the elliptical first matching branch 23 and the edge (left side) of the folded portion 12 is x1, and the distance between the center of the elliptical branch and the end of the main body 11 away from the folded portion 12 is y1. Wherein, x1 = 15.3 mm, and y1 = 23 mm.

[0081] In some embodiments, the first matching stub 23 can also be configured as a rectangle or other shapes, so that the first matching stub 23 can optimize the impedance matching of the antenna in the first operating frequency band.

[0082] In some embodiments, the first matching branch 23 is set at an angle to the feed line portion 21, and the first matching branch 23 extends toward the first spiral radiating branch 221 or the second spiral radiating branch 222, wherein the angle between the first matching branch 23 and the feed line portion 21 is θ, which satisfies that θ is an obtuse angle.

[0083] It is understandable that the first matching stub 23 is set at an angle to the feed line 21, and the included angle is an obtuse angle, so as to ensure that the first matching stub 23 can optimize the impedance matching of the antenna in the first operating frequency band.

[0084] In some embodiments, θ = 105°.

[0085] In some embodiments, the radiator 2 further includes a second matching stub 24, which is connected to a first helical radiating stub 221 or a second helical radiating stub 222. The second matching stub 24 is configured to optimize the impedance matching of the antenna in the second operating frequency band and broaden the radiation bandwidth of the antenna in the second operating frequency band.

[0086] Understandably, by connecting a second matching stub 24 to either the first helical radiating stub 221 or the second helical radiating stub 222, the second matching stub 24 can optimize the load at the transmission line termination, making the characteristic impedance of the matched load at the transmission line termination infinitely close to the characteristic impedance of the entire transmission line. According to transmission line theory, when the transmission line termination is connected to a load equal to its characteristic impedance, only traveling waves exist on the transmission line, resulting in the highest radiation efficiency and the best impedance matching. That is, the standing wave ratio is 1, the return loss is negative infinity, and the reflection coefficient is minimal.

[0087] In some embodiments, the second operating frequency band is the 5.8 GHz band. Specifically, the second matching stub 24 can optimize the impedance matching of the antenna at the 5.8 GHz frequency point, thereby enabling adaptive optimization of the impedance matching of the antenna in the 5.8 GHz band.

[0088] In some embodiments, the second matching branch 24 is configured as an annular shape. The inner diameter of the annular second matching branch 24 is R1, and the difference between its inner and outer diameters is G1. Wherein, R1 = 2.2 mm, and G1 = 0.7 mm. The distance between the center of the annular second matching branch 24 and the edge (left side) of the folded portion 12 is x2, and the distance between the center and the end of the main body 11 away from the folded portion 12 is y2. Wherein, x2 = 15.5 mm, and y2 = 35.5 mm.

[0089] In some embodiments, the extension length of the first helical radiating branch 221 is A, and the extension length of the second helical radiating branch 222 is B, satisfying: A > B, wherein the second matching branch 24 is connected to the first helical radiating branch 221.

[0090] Understandably, based on the different extension lengths of the first helical radiating stub 221 and the second helical radiating stub 222, the second matching stub 24 is connected to the first radiating stub with a longer extension length to ensure that the second matching stub 24 can optimize the impedance matching of the antenna in the second operating frequency band and broaden the radiation bandwidth of the antenna in the second operating frequency band.

[0091] In some embodiments, the radiator 2 further includes a grounding portion 25 disposed on the main body portion 11, and the grounding portion 25 is configured to connect to the grounding pin of the adapter.

[0092] Understandably, the grounding part 25 can be connected to the grounding pin of the adapter, thereby grounding the antenna after the grounding part 25 is electrically connected to the grounding pin.

[0093] In some embodiments, two grounding portions 25 are provided. The two grounding portions 25 are located on opposite sides of the feeder portion 21, respectively.

[0094] like Figure 3 As shown, in some embodiments, the grounding portion 25 is rectangular. The length of the grounding portion 25 is L, and the height of the grounding portion 25 is H2. Wherein, L = 20 mm, and H2 = 16 mm.

[0095] In some embodiments, the substrate 1 has a crease 13 that divides the substrate 1 into a main body portion 11 and a folded portion 12. The ground portion 25 has a proximal edge 251 near the crease 13, and the crease 13 and the proximal edge 251 are arranged parallel to each other.

[0096] Understandably, the crease 13 is designed to facilitate the folding of the folding portion 12 along the crease 13, making it easier for the substrate 1 to switch from the unfolded state to the folded state. The crease 13 is parallel to the edge 251, so that the resonant frequency of the antenna does not change after the state switch, but changes the impedance matching of the antenna in the 2.4GHz and 5.8GHz bands, thereby changing the radiation bandwidth of the antenna.

[0097] In some embodiments, the distance between the crease 13 and the nearest edge 251 is D, which satisfies: 0 ≤ D ≤ 2 mm.

[0098] Understandably, if the fold coincides with the grounding portion 25, it will not affect the antenna's radiation performance. However, if the distance between the fold 13 and the edge 251 exceeds 2 mm, it will significantly affect the antenna's radiation frequency. Therefore, the distance between the fold 13 and the edge 251 is kept to be less than or equal to 2 mm to ensure that the antenna's radiation performance is not affected.

[0099] In some embodiments, the distance between the crease 13 and the adjacent edge 251 is set to 0, 0.5 mm, 1 mm, 1.5 mm, 2 mm, or any value between any two.

[0100] The antenna fabrication method in this application embodiment is as follows:

[0101] Step 1: Flatten the paper with the antenna structure printed on it, and then print the antenna structure on the paper in a 1:1 ratio.

[0102] Step 2: Pour the conductive silver paste into a container and add an appropriate amount of alcohol to the container and stir thoroughly to obtain a conductive paste with good ductility and uniformity.

[0103] Step 3: Apply conductive paste along the edges of the antenna structure printed on the paper to form an antenna radiation pattern on the paper surface.

[0104] Step 4: Place the paper coated with conductive paste into a drying oven and dry it at 80 degrees Celsius for 30 minutes to obtain the antenna in the embodiment of this application.

[0105] After the antenna is fabricated, the SMA adapter can be soldered to the antenna using solder wire and a soldering gun.

[0106] It is understood that the antennas prepared in the embodiments of this application are based on the above-described method, which makes the antenna preparation method simple and easy to process, and the manufactured antennas have the advantages of being environmentally friendly and highly ductile, thereby improving the freedom of antenna design.

[0107] According to a second aspect of this application, a communication device is provided, which includes the antenna described above. This communication device possesses all the beneficial effects of the antenna described above, which will not be elaborated further herein.

[0108] In the description of this application, 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0109] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0110] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0111] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An antenna, characterized in that, include: The substrate has an unfolded state and a folded state. The impedance of the antenna is different when the substrate is in the unfolded state compared to when the substrate is in the folded state.

2. The antenna according to claim 1, characterized in that, The operating frequency band of the antenna when the substrate is in the unfolded state is different from the operating frequency band of the antenna when the substrate is in the folded state.

3. The antenna according to claim 1, characterized in that, The maximum radiation direction of the antenna when the substrate is in the unfolded state is different from the maximum radiation direction of the antenna when the substrate is in the folded state.

4. The antenna according to any one of claims 1 to 3, characterized in that, The substrate includes: Main body; A folding section is foldably connected to the main body. When the substrate is in the unfolded state, the main body and the folding part are horizontally connected; when the substrate is in the folded state, the main body and the folding part are angularly connected.

5. The antenna according to claim 4, characterized in that, When the substrate is in a folded state, the main body is perpendicularly connected to the folded portion.

6. The antenna according to claim 5, characterized in that, The antenna further includes a radiator disposed on the surface of the substrate, wherein the radiator includes a feed line portion configured to connect to the feed pin of an adapter, and the feed line portion is tapered along the direction from the main body portion to the folded portion.

7. The antenna according to claim 6, characterized in that, The radiator further includes a helical radiating section connected to the feed line section, and the helical radiating section is configured to receive / transmit radiated signals.

8. The antenna according to claim 7, characterized in that, The spiral radiating section includes a first spiral radiating branch and a second spiral radiating branch, which are located on opposite sides of the feeder section, and the first spiral radiating branch and the second spiral radiating branch have opposite bending directions.

9. The antenna according to claim 8, characterized in that, The radiator further includes a first matching stub, which is connected to the feed line section.

10. The antenna according to claim 9, characterized in that, The first matching branch is set at an angle to the feed line section, and the first matching branch extends in the direction of the first spiral radiating branch or the second spiral radiating branch, wherein the angle between the first matching branch and the feed line section is θ, which satisfies that θ is an obtuse angle.

11. The antenna according to claim 8, characterized in that, The radiator further includes a second matching branch, which is connected to either the first spiral radiating branch or the second spiral radiating branch.

12. The antenna according to claim 11, characterized in that, The extension length of the first spiral radial branch is A, and the extension length of the second spiral radial branch is B, satisfying: A > B, wherein the second matching branch is connected to the first spiral radial branch.

13. The antenna according to claim 6, characterized in that, The radiator also includes a grounding part, which is disposed on the main body and configured as a grounding pin for connecting the adapter.

14. The antenna according to claim 13, characterized in that, The substrate has a crease that divides the substrate into the main body and the folded portion, wherein the grounding portion has a proximal side near the crease, and the crease and the proximal side are arranged parallel to each other.

15. The antenna according to claim 14, characterized in that, The distance between the crease and the nearest edge is D, which satisfies: 0≤D≤2 mm.

16. A communication device, characterized in that, The antenna includes any one of claims 1 to 15.

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