Antenna and electronic equipment

Abstract

The invention provides an antenna and electronic equipment, relates to the technical field of radio frequency antennas, and can improve the radiation efficiency of a multi-frequency antenna in two working frequency bands. The antenna comprises a main antenna and a parasitic branch. The main antenna has a first working frequency band and a second working frequency band. The parasitic branch knot and the radiation branch knot of the main antenna have a capacitance coupling effect, the parasitic branch knot comprises a first branch knot section and a second branch knot section, a filter device is connected between the first branch knot section and the second branch knot section, and the filter device is in a conducting state at least when the signal frequency is in a first frequency interval; and when the signal frequency is in the second frequency interval, a blocking state is realized. When the filter device is in a conducting state, a first whole formed by the first branch segment, the second branch segment and the filter device generates first parasitic resonance in a first frequency interval. When the filtering device is in the blocking state, the first branch section generates second parasitic resonance in a second frequency interval. The antenna provided by the invention is used for the communication system.

Description

Technical Field

[0001] The present application relates to the technical field of radio frequency antennas, and in particular to an antenna and an electronic device. Background Art

[0002] With the improvement of communication performance and the increase of communication frequency bands, some antennas in electronic devices such as mobile phones, tablet computers, and laptops need to have more than two working frequency bands at the same time to reduce the space occupied by the antenna.

[0003] In some scenarios, the radiation efficiency of these multi-frequency antennas is low, and parasitic branches need to be added to achieve efficiency tuning. However, in the prior art, a single parasitic branch can often only achieve efficiency tuning for one working frequency band, thus limiting the efficiency improvement of the multi-frequency antenna. Summary of the invention

[0004] The present application provides an antenna and an electronic device, which can improve the radiation efficiency of a multi-frequency antenna in two operating frequency bands.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, an antenna is provided, the antenna comprising a main antenna and a parasitic branch. The main antenna has a first working frequency band and a second working frequency band, the second working frequency band is higher than the first working frequency band, that is, the minimum frequency of the second working frequency band is greater than the maximum frequency of the first working frequency band.

[0007] The parasitic branches have a capacitive coupling effect with the radiating branches of the main antenna.

[0008] The parasitic branch includes a first branch segment and a second branch segment arranged at an interval, and a filter device is connected between the first branch segment and the second branch segment. The filter device is in a conducting state at least when the frequency of the signal entering the filter device is in a first frequency interval, and is in a blocking state when the frequency of the signal entering the filter device is in a second frequency interval.

[0009] The first frequency interval includes the first working frequency band, that is, the minimum frequency of the first frequency interval is less than or equal to the minimum frequency of the first working frequency band, and the maximum frequency of the first frequency interval is greater than or equal to the maximum frequency of the first working frequency band.

[0010] The second frequency interval includes the second working frequency band, that is, the minimum frequency of the second frequency interval is less than or equal to the minimum frequency of the second working frequency band, and the maximum frequency of the second frequency interval is greater than or equal to the maximum frequency of the second working frequency band.

[0011] When the filter device is in the on state, the first branch segment, the second branch segment and the filter device form a first whole, the first whole is capacitively coupled with the radiation branch of the main antenna, and a first parasitic resonance in a first frequency range is generated. When the filter device is in the blocking state, the first branch segment is capacitively coupled with the radiation branch of the main antenna, and a second parasitic resonance in a second frequency range is generated.

[0012] In this way, within the first working frequency band, the filter device is in a conducting state, and the antenna radiates energy with the first overall radiation in addition to the radiation branches of the main antenna, thereby improving the system efficiency of the antenna.

[0013] Similarly, in the second working frequency band, the filter device is in a blocking state, the first branch segment and the second branch segment are independent of each other, and the antenna radiates energy with the help of the first branch segment in addition to the radiation branch of the main antenna, which can also improve the system efficiency of the antenna. Therefore, the antenna provided in this application can simultaneously improve the system efficiency of the two working frequency bands of the main antenna.

[0014] Optionally, the first frequency interval is [f1, f2]. f1 is less than the minimum frequency of the first working frequency band, and the difference between the minimum frequency of the first working frequency band and f1 is greater than 0, and less than or equal to 1 GHz. f2 is greater than the maximum frequency of the first working frequency band, and the difference between f2 and the maximum frequency of the first working frequency band is greater than 0, and less than or equal to 1 GHz. In this way, within the first working frequency band, the energy of the parasitic branch radiation is large, which can improve the system efficiency of the antenna.

[0015] Optionally, the difference between the minimum frequency of the first working frequency band and f1 is equal to 0.1 GHz, and the difference between f2 and the maximum frequency of the first working frequency band is equal to 0.5 GHz. In this way, in the first working frequency band, the energy of the parasitic branch radiation is relatively large, which can further improve the system efficiency of the antenna.

[0016] Optionally, the second frequency interval is [f3, f4]; f3 is less than the minimum frequency of the second operating frequency band, and the difference between the minimum frequency of the second operating frequency band and f3 is greater than 0, and less than or equal to 1 GHz. f4 is greater than the maximum frequency of the second operating frequency band, and the difference between f4 and the maximum frequency of the second operating frequency band is greater than 0, and less than or equal to 1 GHz. In this way, in the second operating frequency band, the energy of parasitic branch radiation is large, which can improve the system efficiency of the antenna.

[0017] Optionally, the difference between the minimum frequency of the second working frequency band and f3 is equal to 0.5 GHz; the difference between f4 and the maximum frequency of the second working frequency band is equal to 0.5 GHz. In this way, in the second working frequency band, the energy of the parasitic branch radiation is relatively large, which can further improve the system efficiency of the antenna.

[0018] Optionally, the end of the second branch segment facing the first branch segment is the first end, and the second branch segment has a first grounding point. Along the length direction of the second branch segment, the first grounding point is spaced apart from the first end. The portion of the second branch segment between the first end and the first grounding point is the second sub-branch segment. When the filter device is in a conducting state, the first branch segment, the second sub-branch segment and the filter device form a second whole, and the second whole is a (1 / 4+M / 2) times wavelength parasitic branch. When the filter device is in a blocking state, the first branch segment is suspended, and the first branch segment is a (1 / 2+N / 2) times wavelength parasitic branch. Among them, M and N are 0 or positive integers. This structure is simple and the layout is reasonable.

[0019] Optionally, the end of the second branch segment facing the first branch segment is the first end, the second branch segment has a first grounding point, and the first grounding point is spaced apart from the first end along the length direction of the second branch segment. The portion of the second branch segment between the first end and the first grounding point is the second sub-branch segment. The end of the first branch segment facing the second branch segment is the second end, the first branch segment has a second grounding point, and the second grounding point is spaced apart from the second end along the length direction of the first branch segment, and the portion of the first branch segment between the second end and the second grounding point is the first sub-branch segment. When the filter device is in the on state, the first sub-branch segment, the second sub-branch segment and the filter device form a third whole, and the third whole is a (1 / 2+M / 2) times wavelength parasitic branch. When the filter device is in the blocking state, the first sub-branch segment is a (1 / 4+N / 2) times wavelength parasitic branch. Wherein, M and N are 0 or positive integers. This structure is simple and the layout is reasonable.

[0020] Optionally, the end of the first branch segment facing the second branch segment is the second end, the first branch segment has a second grounding point, and along the length direction of the first branch segment, the second grounding point is spaced apart from the second end, and the portion of the first branch segment between the second end and the second grounding point is the first sub-branch segment. When the filter device is in the on state, the first sub-branch segment, the second branch segment and the filter device form a fourth whole, and the fourth whole is a (1 / 4+M / 2) times wavelength parasitic branch. When the filter device is in the blocking state, the second branch segment is suspended, and the first sub-branch segment is a (1 / 4+N / 2) times wavelength parasitic branch. Among them, M and N are 0 or positive integers. This structure is simple and the layout is reasonable.

[0021] Optionally, the parasitic branch is suspended. When the filter device is in the on state, the first branch segment, the second branch segment and the filter device form a first whole that is a parasitic branch with a wavelength of (1 / 2+M / 2). When the filter device is in the blocking state, the first branch segment is a parasitic branch with a wavelength of (1 / 2+N / 2). Wherein, M and N are 0 or positive integers. This structure is simple and has low cost.

[0022] Optionally, the filter device includes an inductor or a circuit obtained by connecting an inductor and a capacitor in parallel, in series, or in series and in parallel.

[0023] Optionally, the radiating branches of the main antenna include a main radiating branch segment and a parasitic branch segment. The main radiating branch segment has a feeding point and a third grounding point spaced apart along its length direction, the main radiating branch segment also has a third end, the third end is located on the side of the feeding point away from the third grounding point and spaced apart from the feeding point, the parasitic branch segment is located on the side of the third end away from the feeding point, and the parasitic branch segment has a fourth grounding point. In the first operating frequency band, the main radiating branch segment resonates. In the second operating frequency band, part of the main radiating branch segment between the feeding point and the third end generates a monopole mode resonance, and / or part of the main radiating branch segment between the feeding point and the fourth grounding point and the parasitic branch segment generates a ring mode resonance, and / or the parasitic branch segment generates a parasitic resonance. Therefore, the main antenna 1 has at least four operating frequency bands, which can save space.

[0024] Optionally, the first branch segment includes a first section, a second section and a third section. The first section is opposite to the parasitic branch segment, the second section is opposite to part of the main radiating branch segment between the feeding point and the third end, the third section is connected between the first section and the second section, and the third section is opposite to the gap between the main radiating branch segment and the parasitic branch segment. The second branch segment is located on the side of the second section away from the first section, and the second branch segment is opposite to the main radiating branch segment. In this way, in the first frequency band, the electric field is located at the main radiating branch segment, and the first whole is opposite to the main radiating branch segment, which can produce strong capacitive coupling. The parasitic resonance efficiency generated by the first whole is relatively high, which can improve the radiation efficiency of the antenna in the first working frequency band. In the second frequency range, the electric field point is located in the parasitic branch segment, and / or in part of the main radiating branch segment between the feeding point and the third end, and / or in the gap between the main radiating branch segment and the parasitic branch segment. Part of the first branch segment is opposite to the parasitic branch segment, another part is opposite to part of the main radiating branch segment between the feeding point and the third end, and another part is opposite to the gap between the main radiating branch segment and the parasitic branch segment, which can generate strong capacitive coupling. The parasitic resonance efficiency generated by the first branch segment is relatively high, which can improve the radiation efficiency of the antenna in the second working frequency band.

[0025] Optionally, the electrical length of the second branch segment is less than or equal to 1 / 4 of the wavelength corresponding to the maximum frequency of the second working frequency band. In this way, within the first working frequency band and the second working frequency band, the electrical length of the second branch segment is shorter and cannot be excited to generate reverse current, thereby reducing the impact on the radiation efficiency of the main antenna.

[0026] Optionally, the first operating frequency band is the Wi-Fi 2.4G frequency band, and the second operating frequency band is the Wi-Fi 5G frequency band.

[0027] In a second aspect, an antenna is provided, the antenna comprising a main antenna and a parasitic branch. The main antenna has a first working frequency band and a second working frequency band, the second working frequency band is higher than the first working frequency band, that is, the minimum frequency of the second working frequency band is greater than the maximum frequency of the first working frequency band.

[0028] The parasitic branches have a capacitive coupling effect with the radiating branches of the main antenna.

[0029] The parasitic branch includes a first branch segment and a second branch segment arranged at an interval, and a filter device is connected between the first branch segment and the second branch segment. The filter device is in a blocking state at least when the frequency of the signal entering the filter device is in a first frequency range, and is in a conducting state when the frequency of the signal entering the filter device is in a second frequency range.

[0030] The first frequency interval includes a first operating frequency band, and the second frequency interval includes a second operating frequency band.

[0031] When the filter device is in a blocking state, the second branch segment is capacitively coupled with the radiating branch segment of the main antenna, and a third parasitic resonance is generated within the first frequency range; when the filter device is in a conducting state, the first branch segment, the second branch segment and the filter device form a first whole, which is capacitively coupled with the radiating branch segment of the main antenna, and a fourth parasitic resonance is generated within the second frequency range.

[0032] In this way, within the first working frequency band, the filter device is in a blocking state, the first branch segment and the second branch segment are independent of each other, and the antenna radiates energy with the help of the second branch segment in addition to the radiation branch of the main antenna, thereby improving the system efficiency of the antenna.

[0033] Similarly, in the second working frequency band, the filter device is in the on state, and the antenna can improve the system efficiency of the antenna by using the first overall radiation energy in addition to the radiation branch radiation energy of the main antenna. Therefore, the antenna provided in this application can simultaneously improve the system efficiency of the two working frequency bands of the main antenna.

[0034] Optionally, the first frequency interval is [f1, f2]. f1 is less than the minimum frequency of the first working frequency band, and the difference between the minimum frequency of the first working frequency band and f1 is greater than 0, and less than or equal to 1 GHz. f2 is greater than the maximum frequency of the first working frequency band, and the difference between f2 and the maximum frequency of the first working frequency band is greater than 0, and less than or equal to 1 GHz. In this way, within the first working frequency band, the energy of the parasitic branch radiation is large, which can improve the system efficiency of the antenna.

[0035] Optionally, the difference between the minimum frequency of the first working frequency band and f1 is equal to 0.1 GHz, and the difference between f2 and the maximum frequency of the first working frequency band is equal to 0.5 GHz. In this way, in the first working frequency band, the energy of the parasitic branch radiation is relatively large, which can further improve the system efficiency of the antenna.

[0036] Optionally, the second frequency interval is [f3, f4]; f3 is less than the minimum frequency of the second operating frequency band, and the difference between the minimum frequency of the second operating frequency band and f3 is greater than 0, and less than or equal to 1 GHz. f4 is greater than the maximum frequency of the second operating frequency band, and the difference between f4 and the maximum frequency of the second operating frequency band is greater than 0, and less than or equal to 1 GHz. In this way, in the second operating frequency band, the energy of parasitic branch radiation is large, which can improve the system efficiency of the antenna.

[0037] Optionally, the difference between the minimum frequency of the second working frequency band and f3 is equal to 0.5 GHz; the difference between f4 and the maximum frequency of the second working frequency band is equal to 0.5 GHz. In this way, in the second working frequency band, the energy of the parasitic branch radiation is relatively large, which can further improve the system efficiency of the antenna.

[0038] Optionally, the end of the second branch segment facing the first branch segment is the first end, and the second branch segment has a first grounding point. Along the length direction of the second branch segment, the first grounding point is spaced apart from the first end. The portion of the second branch segment between the first end and the first grounding point is the second sub-branch segment. When the filter device is in a blocking state, the first branch segment is suspended, and the second sub-branch segment is a (1 / 4+N / 2) times wavelength parasitic branch. When the filter device is in a conducting state, the first branch segment, the second sub-branch segment and the filter device form a second whole, and the second whole is a (1 / 4+M / 2) times wavelength parasitic branch. Wherein, M and N are 0 or positive integers. This structure is simple and the layout is reasonable.

[0039] Optionally, the end of the second branch segment facing the first branch segment is the first end, the second branch segment has a first grounding point, and the first grounding point is spaced apart from the first end along the length direction of the second branch segment. The portion of the second branch segment between the first end and the first grounding point is the second sub-branch segment. The end of the first branch segment facing the second branch segment is the second end, the first branch segment has a second grounding point, and the second grounding point is spaced apart from the second end along the length direction of the first branch segment, and the portion of the first branch segment between the second end and the second grounding point is the first sub-branch segment. When the filter device is in a blocking state, the second sub-branch segment is a (1 / 4+N / 2) times wavelength parasitic branch. When the filter device is in a conducting state, the first sub-branch segment, the second sub-branch segment and the filter device form a third whole, and the third whole is a (1 / 2+M / 2) times wavelength parasitic branch. Wherein, M and N are 0 or positive integers. This structure is simple and the layout is reasonable.

[0040] Optionally, the end of the first branch segment facing the second branch segment is the second end, the first branch segment has a second grounding point, and along the length direction of the first branch segment, the second grounding point is spaced apart from the second end, and the portion of the first branch segment between the second end and the second grounding point is the first sub-branch segment. When the filter device is in a blocking state, the second branch segment is suspended, and the second branch segment is a (1 / 2+N / 2) times wavelength parasitic branch. When the filter device is in a conducting state, the first sub-branch segment, the second branch segment and the filter device form a fourth whole, and the fourth whole is a (1 / 4+M / 2) times wavelength parasitic branch. Wherein, M and N are 0 or positive integers. This structure is simple and the layout is reasonable.

[0041] Optionally, the parasitic branch is suspended. When the filter device is in a blocking state, the second branch segment is a parasitic branch with a wavelength of (1 / 2+M / 2). When the filter device is in a conducting state, the first whole formed by the first branch segment, the second branch segment and the filter device is a parasitic branch with a wavelength of (1 / 2+N / 2). Wherein, M and N are 0 or positive integers. This structure is simple and has low cost.

[0042] Optionally, the filter device includes a capacitor or a circuit obtained by connecting an inductor and a capacitor in parallel, in series, or in series-parallel connection.

[0043] Optionally, the radiating branches of the main antenna include a main radiating branch segment and a parasitic branch segment. The main radiating branch segment has a feeding point and a third grounding point spaced apart along its length direction, the main radiating branch segment also has a third end, the third end is located on the side of the feeding point away from the third grounding point and spaced apart from the feeding point, the parasitic branch segment is located on the side of the third end away from the feeding point, and the parasitic branch segment has a fourth grounding point. In the first operating frequency band, the main radiating branch segment resonates. In the second operating frequency band, part of the main radiating branch segment between the feeding point and the third end generates a monopole mode resonance, and / or part of the main radiating branch segment between the feeding point and the fourth grounding point and the parasitic branch segment generates a ring mode resonance, and / or the parasitic branch segment generates a parasitic resonance. The first branch segment is opposite to the parasitic branch segment, and the second branch segment is opposite to the main radiating branch segment.

[0044] In this way, in the first frequency band, the electric field point is located in the main radiation branch segment, and the second branch segment is opposite to the main radiation branch segment, which can produce strong capacitive coupling, and the parasitic resonance efficiency generated by the second branch segment is relatively high, which can improve the radiation efficiency of the antenna in the first working frequency band. In the second frequency range, the electric field point is located in the parasitic branch segment, and / or in part of the main radiation branch segment between the feeding point and the third end, and / or in the gap between the main radiation branch segment and the parasitic branch segment. The first whole is opposite to the parasitic branch segment, which can produce strong capacitive coupling, and the parasitic resonance efficiency generated by the first whole is relatively high, which can improve the radiation efficiency of the antenna in the second working frequency band.

[0045] Optionally, the electrical length of the first branch segment is less than or equal to 1 / 4 of the wavelength corresponding to the maximum frequency of the second working frequency band. In this way, within the first working frequency band, the electrical length of the first branch segment is shorter and cannot be excited to generate reverse current, thereby reducing the impact on the radiation efficiency of the main antenna.

[0046] In a third aspect, an electronic device is also provided, which includes a housing and an antenna as described in any of the above technical solutions, wherein the radiation branches and parasitic branches of the main antenna in the antenna are arranged on the housing.

[0047] Since the electronic device provided in the present application includes the antenna as described in any of the above technical solutions, both can solve the same problem and produce the same effect.

[0048] In a fourth aspect, an electronic device is also provided, which includes a housing, a main antenna and a parasitic branch.

[0049] The housing includes a first housing, a second housing and a rotating shaft mechanism, wherein the rotating shaft mechanism is connected between the first housing and the second housing so as to rotate the housing between a folded state and an unfolded state; when the housing is in the folded state, the first housing and the second housing are stacked; when the housing is in the unfolded state, the first housing and the second housing are arranged side by side.

[0050] The radiation branches of the main antenna are arranged on the first shell. The main antenna has a first working frequency band and a second working frequency band. The second working frequency band is higher than the first working frequency band.

[0051] The parasitic branch is arranged on the second shell, and when the shell is in a folded state, the parasitic branch has a capacitive coupling effect with the radiation branch of the main antenna.

[0052] Among them, the parasitic branch includes a first branch segment and a second branch segment arranged at an interval, and a filter device is connected between the first branch segment and the second branch segment. The filter device is in a conducting state at least when the frequency of the signal entering the filter device is in a first frequency range, and is in a blocking state when the frequency of the signal entering the filter device is in a second frequency range.

[0053] The first frequency interval includes the first working frequency band, that is, the minimum frequency of the first frequency interval is less than or equal to the minimum frequency of the first working frequency band, and the maximum frequency of the first frequency interval is greater than or equal to the maximum frequency of the first working frequency band.

[0054] The second frequency interval includes the second working frequency band, that is, the minimum frequency of the second frequency interval is less than or equal to the minimum frequency of the second working frequency band, and the maximum frequency of the second frequency interval is greater than or equal to the maximum frequency of the second working frequency band.

[0055] When the filter device is in the on state, the first branch segment, the second branch segment and the filter device form a first whole, the first whole is capacitively coupled with the radiation branch of the main antenna, and a first parasitic resonance in a first frequency range is generated. When the filter device is in the blocking state, the first branch segment is capacitively coupled with the radiation branch of the main antenna, and a second parasitic resonance in a second frequency range is generated.

[0056] In this way, when the shell is in a folded state, within the first working frequency band, the filter device is in a conductive state, and the antenna not only radiates energy from the branches of the main antenna, but also radiates energy from the first whole body. This can compensate to a certain extent for the reduction in radiation efficiency of the main antenna caused by the second shell and the folding screen on the second shell, thereby improving the system efficiency of the antenna.

[0057] Similarly, in the second working frequency band, the filter device is in a blocking state, the first branch segment and the second branch segment are independent of each other, and the antenna radiates energy with the help of the first branch segment in addition to the radiation branch of the main antenna, which can also compensate for the reduction in the radiation efficiency of the main antenna caused by the second shell and the folding screen on the second shell to a certain extent, thereby improving the system efficiency of the antenna. Therefore, the electronic device provided in this application can compensate for the reduction in the radiation efficiency of the main antenna caused by the second shell and the folding screen on the second shell in two working frequency bands, thereby improving the system efficiency of the antenna.

[0058] In a fifth aspect, an electronic device is also provided, which includes a housing, a main antenna and a parasitic branch.

[0059] The housing includes a first housing, a second housing and a rotating shaft mechanism, wherein the rotating shaft mechanism is connected between the first housing and the second housing so as to rotate the housing between a folded state and an unfolded state; when the housing is in the folded state, the first housing and the second housing are stacked; when the housing is in the unfolded state, the first housing and the second housing are arranged side by side.

[0060] The radiation branches of the main antenna are arranged on the first shell. The main antenna has a first working frequency band and a second working frequency band. The second working frequency band is higher than the first working frequency band.

[0061] The parasitic branch is arranged on the second shell, and when the shell is in a folded state, the parasitic branch has a capacitive coupling effect with the radiation branch of the main antenna.

[0062] Among them, the parasitic branch includes a first branch segment and a second branch segment arranged at an interval, and a filter device is connected between the first branch segment and the second branch segment. The filter device is in a blocking state at least when the frequency of the signal entering the filter device is in a first frequency range, and is in a conducting state when the frequency of the signal entering the filter device is in a second frequency range.

[0063] The first frequency interval includes a first operating frequency band, and the second frequency interval includes a second operating frequency band.

[0064] When the filter device is in a blocking state, the second branch segment is capacitively coupled with the radiating branch segment of the main antenna, and a third parasitic resonance is generated within the first frequency range; when the filter device is in a conducting state, the first branch segment, the second branch segment and the filter device form a first whole, which is capacitively coupled with the radiating branch segment of the main antenna, and a fourth parasitic resonance is generated within the second frequency range.

[0065] In this way, when the shell is in a folded state, within the first working frequency band, the filter device is in a blocking state, the first branch segment and the second branch segment are independent of each other, and the antenna radiates energy with the help of the second branch segment in addition to the radiation branch of the main antenna. This can compensate to a certain extent for the reduction in radiation efficiency of the main antenna caused by the second shell and the folding screen on the second shell, thereby improving the system efficiency of the antenna.

[0066] Similarly, in the second operating frequency band, the filter device is in the on state. In addition to radiating energy from the branches of the main antenna, the antenna also radiates energy from the first overall radiation, which can compensate to a certain extent for the reduction in radiation efficiency of the main antenna caused by the second shell and the folding screen on the second shell, thereby improving the system efficiency of the antenna.

[0067] Therefore, the electronic device provided in the present application can compensate for the reduction in radiation efficiency of the main antenna caused by the second shell and the folding screen on the second shell in two operating frequency bands, thereby improving the system efficiency of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 A top view of an electronic device in an unfolded state provided in some embodiments of the present application;

[0069] Figure 2 for Figure 1 A perspective view of the electronic device shown in a folded state;

[0070] Figure 3 A three-dimensional diagram of an electronic device in a folded state provided in some other embodiments of the present application;

[0071] Figure 4 for Figure 3 a front view of the electronic device shown;

[0072] Figure 5 A front view of an electronic device in an unfolded state provided by some other embodiments of the present application;

[0073] Figure 6 for Figure 5 A front view of the electronic device shown in a folded state;

[0074] Figure 7 A front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0075] Figure 8 For simulation Figure 5 The antenna in the electronic device is shown in the unfolded state, Figure 6 The antenna in the electronic device shown in the folded state and Figure 7 The radiation efficiency of the antenna in the folded electronic device and the curve diagram of the system efficiency changing with the frequency are shown;

[0076] Fig. 9 A front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0077] Fig.10 for Fig. 9 A schematic diagram of the structure of parasitic branches in the electronic device shown;

[0078] Fig.11 A schematic diagram of the structure of a filter device provided in some embodiments of the present application;

[0079] Fig.12 A schematic diagram of the structure of a filter device provided in some other embodiments of the present application;

[0080] Fig.13 A schematic diagram of the structure of a filter device provided in some embodiments of the present application;

[0081] Fig.14 for Fig.13 The circuit diagram corresponding to the filter device shown;

[0082] Fig.15 A schematic diagram of the structure of a filter device provided in some other embodiments of the present application;

[0083] Fig.16 for Fig.15 The circuit diagram corresponding to the filter device shown;

[0084] Fig.17 A front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0085] Fig.18 for Fig.17 A graph showing the change of input return loss versus frequency when the physical length of the antenna in the electronic device is 12.75 mm, 13.75 mm, 14.75 mm, 16.75 mm and when there is no parasitic branch;

[0086] Fig.19 for Fig.17A curve diagram showing the variation of the radiation efficiency of the antenna in the electronic device with the frequency when the physical length of the parasitic branches is 12.75 mm, 13.75 mm, 14.75 mm, 16.75 mm and when there is no parasitic branches;

[0087] Fig. 20 for Fig.17 The electric field distribution diagrams of the antenna in the electronic device shown are at the frequency points of 2.5 GHz, 2.96 GHz and 3.2 GHz respectively when the physical length of the parasitic branch is 13.75 mm;

[0088] Fig.21 for Fig.17 A curve diagram showing changes in radiation efficiency of the second working frequency band of the antenna in the electronic device when the physical lengths of the parasitic branches are 12.75 mm, 13.75 mm, 14.75 mm, 16.75 mm respectively and when there are no parasitic branches;

[0089] Fig. 22 A front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0090] Fig.23 for Fig. 22 A curve diagram showing the variation of input return loss with frequency when the physical length of the first branch section of the antenna in the electronic device is 10.75 mm, 12.75 mm, 14.75 mm respectively and there is no parasitic branch;

[0091] Fig.24 for Fig. 22 A curve diagram showing the variation of the radiation efficiency of the antenna in the electronic device with the frequency when the physical length of the first branch section is 10.75 mm, 12.75 mm, 14.75 mm and when there is no parasitic branch;

[0092] Fig.25 for Fig. 22 The electric field distribution diagrams at the frequency points of 5.12 GHz, 5.45 GHz and 5.8 GHz respectively when the physical length of the first branch segment of the antenna in the electronic device is 12.75 mm;

[0093] Fig.26 for Fig. 22 A curve diagram showing changes in radiation efficiency of the first working frequency band with frequency when the physical lengths of the antenna in the first branch section of the electronic device are 10.75 mm, 12.75 mm, and 14.75 mm respectively, and when there are no parasitic branches;

[0094] Fig. 27 for Fig. 9 A graph showing how the input return loss, radiation efficiency, and system efficiency of the antenna in the electronic device vary with frequency;

[0095] Fig.28 for Fig. 9 The electric field distribution diagram of the antenna in the electronic device shown at the frequency points of 2.4 GHz, 2.62 GHz, 5.36 GHz and 5.62 GHz;

[0096] Fig.29 for Fig. 9 The antenna in the electronic device shown in the folded state, Fig. 9 The electronic device shown has an internal antenna and a Figure 7 The radiation efficiency of the antenna in the folded electronic device and the curve diagram of the system efficiency changing with the frequency are shown;

[0097] Fig.30 for Fig. 9 The antenna in the electronic device shown in the folded state, Fig. 9 The electronic device shown has an internal antenna and a Figure 7 A graph showing how the system efficiency of an antenna in an electronic device in a folded state varies with frequency;

[0098] Fig.31 for Fig. 9 The antenna in the electronic device in the folded state is shown Fig.17 The antenna in the electronic device shown in the folded state, Fig. 22 The radiation efficiency of the antenna in the folded electronic device and the curve diagram of the system efficiency changing with the frequency are shown;

[0099] Fig.32 A front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0100] Fig.33 for Fig.32 A schematic diagram of the structure of parasitic branches in the electronic device shown;

[0101] Fig.34 A front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0102] Fig.35 for Fig.34 A schematic diagram of the structure of parasitic branches in the electronic device shown;

[0103] Fig.36 A front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0104] Fig.37 A front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0105] Fig.38 for Fig.37A schematic diagram of the structure of parasitic branches in the electronic device shown;

[0106] Fig.39 A front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0107] Fig.40 for Fig.39 A schematic diagram of the structure of parasitic branches in the electronic device shown;

[0108] Fig.41 A front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0109] Fig.42 for Fig.41 A schematic diagram of the structure of parasitic branches in the electronic device shown;

[0110] Fig.43 A front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0111] Fig.44 A perspective view of an electronic device provided for some other embodiments of the present application;

[0112] Fig.45 for Fig.44 The structure diagram of the electronic device shown is when viewed from direction D. DETAILED DESCRIPTION

[0113] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0114] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0115] In the embodiments of the present application, "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0116] It should be noted that, in this embodiment, unless otherwise specified, the description of the length of a component refers to the physical length of the component.

[0117] The present application provides an electronic device, which is a type of electronic device with a communication function. Specifically, the electronic device includes but is not limited to a mobile phone, a tablet computer, a laptop computer, and a smart screen. The embodiment of the present application is exemplified by using the electronic device as a folding screen device, and the folding screen device can specifically be a folding screen mobile phone.

[0118] See also Figure 1 and Figure 2 , Figure 1 A top view of an electronic device 100 in an unfolded state provided in some embodiments of the present application. Figure 2 for Figure 1 The electronic device 100 is shown as a stereogram in a folded state. The electronic device 100 is approximately in the shape of a rectangular flat plate in the folded state. In order to facilitate the description of the embodiments below, an XYZ coordinate system is established for the electronic device 100 in the folded state, and the length direction of the electronic device 100 is defined as the Y-axis direction, the width direction of the electronic device 100 is defined as the X-axis direction, and the thickness direction of the electronic device 100 is defined as the Z-axis direction. It can be understood that the coordinate system setting of the electronic device 100 can be flexibly set according to actual needs, and no specific limitation is made here. In some other embodiments, the shape of the electronic device 100 in the folded state can also be a square flat plate, a circular flat plate, an elliptical flat plate, etc.

[0119] The electronic device 100 includes a folding screen 10 and a housing 20 .

[0120] The folding screen 10 is used to display information such as images and videos. The housing 20 is located on the back side of the folding screen 10 and is used to carry the folding screen 10. The back side of the folding screen 10 refers to the side facing away from the display surface.

[0121] The housing 20 includes a first housing 201 , a second housing 202 and a rotating shaft mechanism 203 .

[0122] The first housing 201 is used to carry a part of the folding screen 10, and the second housing 202 is used to carry another part of the folding screen 10. The hinge mechanism 203 is connected between the first housing 201 and the second housing 202, and is used to realize the relative rotation between the first housing 201 and the second housing 202, so as to support the folding of the folding screen 10 between the unfolded state and the folded state. When the electronic device is in the unfolded state, the housing 20 is in the unfolded state, and the first housing 201 and the second housing 202 are arranged side by side, so that a large screen display can be realized.

[0123] The first housing 201 can be relative to the second housing 202 by Figure 1 In the unfolded state shown, the housing 202 is rotated away from the screen 10 (ie, folded outward) to fold into the folded state, and can also be rotated toward the screen 10 relative to the second housing 202 (ie, folded inward) to fold into the folded state. Figure 2 The first housing 201 is folded inward relative to the second housing 202 to a folded state for exemplary description, which cannot be considered as a special limitation of the present application. When the electronic device is in the folded state, please refer to Figure 2 The housing 20 is in a folded state, and the first housing 201 and the second housing 202 are stacked. In this state, the electronic device is small in size and easy to carry.

[0124] Both the first shell 201 and the second shell 202 have a frame. To facilitate the description of the embodiments below, the frame of the first shell 201 is referred to as the first frame A, and the frame of the second shell 202 is referred to as the second frame B.

[0125] The material of the first frame A and the second frame B may include metals such as stainless steel, aluminum alloy, magnesium alloy, titanium alloy, etc., and may also include non-metals such as polycarbonate (PC), PC+glass fiber, ABS plastic (acrylonitrilebutadiene styrene plastic), etc.

[0126] In some embodiments, the first frame A and the second frame B may include a non-metallic material and a metal conductor embedded in the non-metallic material. In this way, the appearance consistency of the first frame A and the second frame B can be ensured by means of the non-metallic material, and the radiation branch of the antenna can be constructed by means of the metal conductor to realize the transmission and reception of radio frequency signals. At the same time, the metal conductor can also increase the structural strength of the first frame A and the second frame B and improve the impact resistance.

[0127] Please continue reading Figure 1 and Figure 2, the electronic device 100 also includes an antenna 30, which includes but is not limited to a global navigation satellite system (GNSS) antenna, a Bluetooth (BT) antenna, a cellular antenna and a wireless local area network (WLAN) (such as a wireless fidelity (Wi-Fi) network) antenna. The GNSS antenna is used to implement the navigation function, and the GNSS antenna may include but is not limited to a global positioning system (GPS) antenna, a global navigation satellite system (GLONASS) antenna and a Beidou navigation satellite system (BDS) antenna. The BT antenna is used to implement the Bluetooth function. The cellular antenna can be used to implement the call function. The cellular antenna can cover the 2G, 3G, 4G, 5G, long term evolution (LTE) frequency bands, citizen broadband radio service (CBRS) frequency bands and 5G new radio (NR) frequency band ranges.

[0128] The antenna 30 may include a main antenna 1. The main antenna 1 may be disposed in the first shell 201. Specifically, the radiation branch of the main antenna 1 may be formed by a metal conductor of the first frame A. In some other embodiments, when the material of the first frame A is non-metallic, the radiation branch of the main antenna 1 may be disposed on the inner side of the first frame A, and the inner side of the first frame A refers to the side of the first frame A facing the inner space of the first shell 201. In some other embodiments, when the material of the first frame A is metal, the radiation branch of the main antenna 1 may also be formed by the first frame A through a slit.

[0129] In some scenarios, the radiation efficiency of the antenna 30 is low. For example, when the electronic device 100 is in Figure 2 When in the folded state shown, the radiation environment of the main antenna 1 is deteriorated due to the obstruction of the second frame B and part of the screen carried by the second shell 202, and a reverse cancellation current is generated on the second frame B, resulting in a sharp drop in the efficiency of the main antenna 1 and a reduction in the communication performance of the antenna 30.

[0130] In order to improve the radiation efficiency of the antenna 30, parasitic branches may be added to achieve efficiency tuning.

[0131] For examples, see Figure 3 , Figure 3The three-dimensional diagram of the electronic device 100 in the folded state provided in some other embodiments of the present application. In this embodiment, the antenna 30 includes a parasitic branch 2 in addition to the main antenna 1 .

[0132] The parasitic branch 2 may be formed by the metal conductor structure of the second frame B. In some other embodiments, when the material of the second frame B is non-metallic, the parasitic branch 2 may be arranged on the inner side of the second frame B, and the inner side of the second frame B refers to the side of the second frame B facing the inner space of the second shell 202. In some other embodiments, when the material of the second frame B is metal, the parasitic branch 2 may also be formed by the second frame B through a break.

[0133] When the electronic device 100 is in a folded state, the parasitic branch 2 is opposite to the radiating branch of the main antenna 1 in the Z-axis direction, that is, the projection of the parasitic branch 2 on the radiating branch of the main antenna 1 along the Z-axis direction overlaps with the radiating branch of the main antenna 1 .

[0134] The parasitic branch 2 is capacitively coupled with the radiation branch of the main antenna 1 to generate a parasitic resonance, and the center frequency of the parasitic resonance may be located within the operating frequency band of the main antenna 1, or near the operating frequency band. In this way, within the operating frequency band of the main antenna 1, the antenna 30 radiates energy with the help of the parasitic branch 2 in addition to the radiation branch of the main antenna 1, thereby compensating to a certain extent the reduction in the radiation efficiency of the main antenna 1 caused by the folding screen on the second frame B and the second shell 202, and improving the radiation efficiency of the antenna 30.

[0135] With the improvement of communication performance and the increase in communication frequency bands, the antenna 30 in the electronic device needs to integrate more than two working frequency bands, such as integrating the working frequency band of the GPS antenna and the working frequency band of the Wi-Fi antenna, or integrating the 2.4G working frequency band of the Wi-Fi antenna and the 5G working frequency band of the Wi-Fi antenna, so as to reduce the space occupied by the antenna 30 on the frame.

[0136] To meet the above requirements, please refer to the example Figure 4 , Figure 4 for Figure 3 The electronic device 100 is shown in a front view. In this embodiment, the radiation branches of the main antenna 1 include a main radiation branch segment 11 and a parasitic branch segment 12 which are arranged at intervals.

[0137] The main radiation branch segment 11 has a feeding point P01 and a third grounding point P02 which are arranged at intervals along the length direction thereof.

[0138] The feeding point P01 is coupled to the RF front end by means of a feeding element, wherein the RF front end may be arranged on a circuit board in the inner space of the first housing, and the feeding element includes but is not limited to a spring, a coaxial line, and a microstrip line.

[0139] The third grounding point P02 is coupled to the reference ground by means of a grounding member. The reference ground may be a metal plate in an electronic device, such as a middle plate, or a metal reference ground layer in a circuit board. The grounding member includes but is not limited to a conductive block, a conductive wire, and a printed circuit board, etc.

[0140] Based on this, the feeding point P01 and the third grounding point P02 are not actual points. The feeding point P01 refers to the position on the main radiation branch segment 11 coupled to the RF front end, and the third grounding point P02 refers to the position on the main radiation branch segment 11 coupled to the reference ground.

[0141] It should be noted that the "coupling" described in the above embodiments and the embodiments below can be understood as direct coupling and / or indirect coupling. "Direct coupling" can also be referred to as "electrical connection", which can be understood as the physical contact and electrical conduction between components, and can also be understood as the form in which different components in the circuit structure are connected through physical lines such as printed circuit board copper foil or wires that can transmit electrical signals. "Indirect coupling" can be understood as two conductors being electrically conductive in an airless or non-contact manner. In some embodiments, indirect coupling can also be referred to as capacitive coupling, for example, signal transmission is achieved by forming an equivalent capacitor through coupling between the gaps between two conductive parts.

[0142] The main radiation branch segment 11 further has a third end D3 , which is located at a side of the feeding point P01 away from the third grounding point P02 and spaced apart from the feeding point P01 .

[0143] Based on this, the parasitic branch segment 12 is located at a side of the third end D3 away from the feeding point P01 .

[0144] The parasitic branch segment 12 may have a fourth grounding point P03, which is coupled to the reference ground by means of a grounding member. Similarly, the fourth grounding point P03 is not a real point, but refers to a position on the parasitic branch segment 12 coupled to the reference ground.

[0145] When the RF front end feeds the RF signal to the feeding point P01, the left-hand mode of the main radiating branch segment 11, the monopole mode from the feeding point P01 to the third end D3, the parasitic mode of the parasitic branch segment 12, and the ring mode from the feeding point P01 to the fourth grounding point P03 can be excited as the frequency of the RF signal varies. Therefore, the main antenna 1 has at least four operating frequency bands.

[0146] Based on this, please continue to refer to Figure 4 Since the shape and size of the parasitic branch 2 are fixed and the generated parasitic mode is fixed, the parasitic branch 2 can often only achieve efficiency tuning of one working frequency band of the main antenna 1.

[0147] Based on this, in order to achieve efficiency tuning of multiple working frequency bands, multiple lumped parameter elements and selection switches can be set on the grounding line of the parasitic branch 2. The lumped parameter elements include but are not limited to capacitors, inductors, or circuits obtained by connecting one or both of the inductors and capacitors in parallel, in series, or in series-parallel connection.

[0148] By selecting switches and connecting different lumped parameter elements in series to the ground line, the electrical length of the parasitic branch 2 can be adjusted, thereby adjusting the resonant center frequency of the parasitic branch 2 to different operating frequency bands or nearby, and improving the radiation efficiency of multiple operating frequency bands. However, this leads to increased costs, and requires high selection accuracy and electrical connection accuracy of the lumped parameter elements, which is difficult to achieve.

[0149] In order to reduce the cost and difficulty of implementation, in some other embodiments, please refer to Figure 5 and Figure 6 , Figure 5 This is a front view of the electronic device 100 in the unfolded state provided in some embodiments of the present application. Figure 6 for Figure 5 The front view of the electronic device 100 shown is in a folded state. In this embodiment, the number of parasitic branches 2 is two, namely a first parasitic branch 2a and a second parasitic branch 2b. The first parasitic branch 2a is opposite to the main radiation branch segment 11, and is used to achieve efficiency tuning in a mode (such as a left-hand mode) of the main radiation branch segment 11, and the second parasitic branch 2b is opposite to the parasitic branch segment 12, and is used to achieve efficiency tuning of the parasitic resonance of the parasitic branch segment 12. In this way, by increasing the number of parasitic branches, efficiency tuning of multiple working frequency bands can be achieved.

[0150] However, the parasitic branch length that improves the efficiency of the lower working frequency band is relatively long, which blocks the main antenna 1 in the higher working frequency band, resulting in lower efficiency of the antenna 30 in the higher working frequency band. The parasitic branch length that improves the efficiency of the higher working frequency band is relatively short, and does not block the main antenna 1 in the lower working frequency band. Therefore, it is still impossible to take into account the improvement of more than two working frequency bands at the same time.

[0151] Based on this, in order to reduce the reduction in the radiation efficiency of the main antenna 1 caused by the second frame B and the folding screen on the second housing 202, in some other embodiments, refer to Figure 7 , Figure 7A front view of the electronic device 100 provided in some other embodiments of the present application when in a folded state. In this embodiment, a plurality of breaks are provided on the portion of the metal conductor of the second frame B that is opposite to the radiating branches of the main antenna 1, and the plurality of breaks separate the metal conductor into a plurality of shorter suspended branches n. The suspended branches n are short in length and cannot be excited to resonate and generate reverse current, so the radiation efficiency of the main antenna 1 is not reduced. However, in the folded state, the folding screen on the second shell still blocks the main antenna 1, resulting in a still low radiation efficiency of the antenna 30. Moreover, a large number of breaks are provided, and the structural strength of the second frame B is difficult to guarantee.

[0152] See also Figure 8 , Figure 8 For simulation Figure 5 The antenna 30, Figure 6 The antenna 30 and the Figure 7 The graph shows the change of the radiation efficiency (Rad.Eff) and the system efficiency (Tot.Eff) of the antenna 30 in the electronic device 100 in the folded state with the frequency (Frequency).

[0153] Specifically, Figure 5 The antenna 30 in the electronic device 100 shown in the unfolded state is Figure 8 In the figure, it is represented as “Scheme 1 expanded state”. Figure 6 The antenna 30 in the electronic device 100 in the folded state is shown. Figure 8 In the figure, it is represented as “Scheme 1 folded state”. Figure 7 The performance of the internal antenna 30 of the electronic device 100 when in the unfolded state is shown as follows: Figure 5 The performance of the antenna 30 in the electronic device 100 in the unfolded state is the same. Figure 7 The antenna 30 in the electronic device 100 in the folded state is shown. Figure 8 It is represented as “Scheme 2 folded state”.

[0154] Among them, the system efficiencies (Tot. Eff) of “Scheme 1 unfolded state”, “Scheme 1 folded state” and “Scheme 2 folded state” in the GPS band and the n41 band are recorded in Table 1 below.

[0155] Table 1

[0156] Antenna environment GPS band system efficiency (dB) n41 band system efficiency (dB) Scheme 1: Expanded state -3.9 -3.22 Scheme 1 Folded state -4.24 -6.76 Scheme 2 Folded state -4.7 -5.42

[0157] Depend on Figure 8As can be seen from Table 1, the system efficiency of the antennas shown in Scheme 1 and Scheme 2 when the electronic device 100 is in a folded state is 0.3dB-3.5dB lower than the system efficiency in an unfolded state. Therefore, in the folded state, the second frame B and the folding screen on the second shell still affect the efficiency of the main antenna 1.

[0158] Based on this, in order to improve the radiation efficiency of the antenna 30 in the two working frequency bands, please refer to Fig. 9 , Fig. 9 The front view of the electronic device 100 in the folded state provided in some other embodiments of the present application. The electronic device 100 includes an antenna 30, and the antenna 30 includes a main antenna 1. The main antenna 1 is arranged in the first shell 201. The main antenna 1 can be specifically arranged in the first middle frame A of the first shell 201. In other embodiments, the main antenna 1 can also be arranged on the inner side of the first middle frame A.

[0159] The main antenna 1 is a multi-frequency antenna including at least two working frequency bands.

[0160] Specifically, the main antenna 1 has a first working frequency band and a second working frequency band, and the second working frequency band is higher than the first working frequency band, that is, the minimum frequency of the second working frequency band is greater than the maximum frequency of the first working frequency band.

[0161] The first working frequency band may be a GPS band, a Wi-Fi 2.4G band, etc., and the second working frequency band may be an n41 band, a Wi-Fi 5G band, etc. The following embodiments are exemplified by taking the first working frequency band as the Wi-Fi 2.4G band and the second working frequency band as the Wi-Fi 5G band, which cannot be regarded as a special limitation on the present application. The frequency range of the Wi-Fi 2.4G band is 2.4GHz-2.5GHz, and the frequency range of the Wi-Fi 5G band is 5.15GHz-5.85GHz.

[0162] In some embodiments, see Fig. 9 , the main antenna 1 can be connected with Figure 4-Figure 7 The main antenna 1 in the electronic device 100 shown has the same structural form. Based on this, optionally, in the first working frequency band, the main radiating branch segment 11 of the main antenna 1 generates resonance, and specifically, the main radiating branch segment 11 can generate left-hand mode resonance. In the second working frequency band, part of the main radiating branch segment 11 between the feeding point P01 and the third end D3 generates monopole mode resonance, and / or part of the main radiating branch segment 11 between the feeding point P01 and the fourth grounding point P03 and the parasitic branch segment 12 generates ring mode resonance, and / or the parasitic branch segment 12 generates parasitic resonance.

[0163] Please continue reading Fig. 9The antenna 30 further includes a parasitic branch 2. The parasitic branch 2 is disposed in the second housing 202, and the parasitic branch 2 can be specifically disposed in the second middle frame B of the second housing 202. In other embodiments, the parasitic branch 2 can also be disposed on the inner side of the second middle frame B.

[0164] When the electronic device 100 is in the folded state, the parasitic branch 2 and the radiation branch of the main antenna 1 have a capacitive coupling effect.

[0165] The parasitic branch 2 includes a first branch segment 21 and a second branch segment 22 arranged at intervals. A filter device 23 is connected between the first branch segment 21 and the second branch segment 22.

[0166] In some embodiments, please refer to Fig. 9 , the filter device 23 can be connected between one end of the first branch segment 21 facing the second branch segment 22 and one end of the second branch segment 22 facing the first branch segment 21. This structure is simple and can make full use of the parasitic branch 2. Of course, in other embodiments, the filter device 23 can also be connected between the middle section of the first branch segment 21 and the middle section of the second branch segment 22. The following embodiments are further explained on the basis that the filter device 23 is connected between one end of the first branch segment 21 facing the second branch segment 22 and one end of the second branch segment 22 facing the first branch segment 21, which cannot be regarded as a special limitation on the present application.

[0167] The filter device 23 is in a conducting state at least when the signal frequency is in a first frequency interval, and is in a blocking state when the signal frequency is in a second frequency interval. The signal frequency refers to the frequency of the signal entering the filter device 23.

[0168] The first frequency interval includes the first working frequency band, that is, the minimum frequency of the first frequency interval is less than or equal to the minimum frequency of the first working frequency band, and the maximum frequency of the first frequency interval is greater than or equal to the maximum frequency of the first working frequency band.

[0169] In some embodiments, the first frequency interval is [f1, f2]. f1 is less than the minimum frequency of the first operating frequency band, and the difference between the minimum frequency of the first operating frequency band and f1 is greater than 0, and less than or equal to 1 GHz. f2 is greater than the maximum frequency of the first operating frequency band, and the difference between f2 and the maximum frequency of the first operating frequency band is greater than 0, and less than or equal to 1 GHz.

[0170] Optionally, the difference between the minimum frequency of the first working frequency band and f1 is equal to 0.1 GHz; the difference between f2 and the maximum frequency of the first working frequency band is equal to 0.5 GHz.

[0171] Similarly, the second frequency interval includes the second working frequency band, that is, the minimum frequency of the second frequency interval is less than or equal to the minimum frequency of the second working frequency band, and the maximum frequency of the second frequency interval is greater than or equal to the maximum frequency of the second working frequency band.

[0172] In some embodiments, the second frequency interval is [f3, f4]; f3 is less than the minimum frequency of the second operating frequency band, and the difference between the minimum frequency of the second operating frequency band and f3 is greater than 0, and less than or equal to 1 GHz. f4 is greater than the maximum frequency of the second operating frequency band, and the difference between f4 and the maximum frequency of the second operating frequency band is greater than 0, and less than or equal to 1 GHz. In this way, in the second operating frequency band, the energy of the parasitic branch radiation is large, which can improve the system efficiency of the antenna.

[0173] Optionally, the difference between the minimum frequency of the second working frequency band and f3 is equal to 0.5 GHz; the difference between f4 and the maximum frequency of the second working frequency band is equal to 0.5 GHz. In this way, in the second working frequency band, the energy of the parasitic branch radiation is relatively large, which can further improve the system efficiency of the antenna.

[0174] In some embodiments, the filter device 23 can be in a conducting state in a larger interval range including the first frequency interval, and in a blocking state in a larger interval range including the second frequency interval. For example, the filter device 23 is in a conducting state when the signal frequency is less than the first preset threshold, and is in a blocking state when the signal frequency is greater than or equal to the first preset threshold. Among them, the first preset threshold can be greater than the maximum frequency of the first frequency interval and less than the minimum frequency of the second frequency interval. In this way, the filter device 23 is a low-pass high-impedance device, which has a simple structure and is easy to implement.

[0175] In other embodiments, the filter device 23 may be in a conducting state in the first frequency interval, and in a blocking state in other frequency intervals outside the first frequency interval, wherein the other frequency intervals include the second frequency interval. The filter device 23 may also be in a blocking state in the second frequency interval, and in a conducting state in other frequency intervals outside the second frequency interval, wherein the other frequency intervals include the first frequency interval.

[0176] On the basis of any of the above embodiments, when the filter device 23 is in the on state, the first branch segment 21, the second branch segment 22 and the filter device 23 form a first whole, which is capacitively coupled with the radiation branch of the main antenna 1 and generates a first parasitic resonance within a first frequency range, that is, the resonance center frequency of the first parasitic resonance is within the first frequency range. When the filter device 23 is in the blocking state, the first branch segment 21 is capacitively coupled with the radiation branch of the main antenna 1 and generates a second parasitic resonance within a second frequency range, that is, the resonance center frequency of the second parasitic resonance is within the second frequency range.

[0177] In this way, within the first working frequency band, the filter device 23 is in a conducting state, and the antenna 30 not only uses the radiation branch radiation energy of the main antenna 1, but also uses the first overall radiation energy, thereby being able to compensate to a certain extent for the reduction in radiation efficiency of the main antenna 1 caused by the folding screen on the second frame B and the second shell 202, thereby improving the system efficiency of the antenna 30.

[0178] Similarly, in the second working frequency band, the filter device 23 is in a blocking state, the first branch segment 21 and the second branch segment 22 are independent of each other, and the antenna 30 radiates energy with the help of the radiation branches of the main antenna 1 as well as the first branch segment 21, which can also compensate to a certain extent for the reduction in the radiation efficiency of the main antenna 1 caused by the folding screen on the second frame B and the second shell 202, thereby improving the system efficiency of the antenna 30.

[0179] Therefore, with the help of the parasitic branch 2, the system efficiency of the two working frequency bands of the main antenna 1 can be tuned. This structure is simple, occupies a small space, and the length of the first whole and the length of the first branch segment 21 do not interfere with each other. Both can be adjusted to the optimal state, which can maximize the radiation efficiency of the antenna 30 in the first working frequency band and the second working frequency band.

[0180] Based on the above embodiment, optionally, when the electronic device 100 is in a folded state, refer to Fig. 9 , the second branch segment 22 is opposite to the main radiating branch segment 11, that is, the projection of the second branch segment 22 on the main radiating branch segment 11 along the direction perpendicular to the main radiating branch segment 11 overlaps with the main radiating branch segment 11, and the projection of the main radiating branch segment 11 on the second branch segment 22 along the direction perpendicular to the second branch segment 22 overlaps with the second branch segment 22.

[0181] It should be noted that, in this embodiment and the embodiments below, the description of "overlapping" of two objects includes four implementation methods: the entirety of one object overlaps the entirety of the other object, the portion of one object overlaps the entirety of the other object, the entirety of one object overlaps the portion of the other object, and the portion of one object overlaps the portion of the other object. The same descriptions in the following text should be understood in the same way.

[0182] Similarly, please continue to read Fig. 9 The first branch segment 21 includes a first section, a second section and a third section. The first section is opposite to the parasitic branch segment 12, the second section is opposite to a portion of the main radiation branch segment 11 between the feeding point P01 and the third end D3, the third section is connected between the first section and the second section, and the third section is opposite to the gap between the main radiation branch segment 11 and the parasitic branch segment 12.

[0183] In this way, in the first frequency band, the electric field point with the largest electric field (that is, the position with the largest current intensity) is located at the main radiation branch segment 11, and the first whole is opposite to the main radiation branch segment 11, which can produce strong capacitive coupling, and the parasitic resonance efficiency generated by the first whole is relatively high, which can improve the radiation efficiency of the antenna 30 in the first working frequency band. In the second frequency band, the electric field point with the largest electric field is located at the parasitic branch segment 12, and / or at part of the main radiation branch segment 11 between the feeding point P01 and the third end D3, and / or at the gap between the main radiation branch segment 11 and the parasitic branch segment 12. A part of the first branch segment 21 is opposite to the parasitic branch segment 12, another part is opposite to part of the main radiation branch segment 11 between the feeding point P01 and the third end D3, and another part is opposite to the gap between the main radiation branch segment 11 and the parasitic branch segment 12, which can produce strong capacitive coupling, and the parasitic resonance efficiency generated by the first branch segment 21 is relatively high, which can improve the radiation efficiency of the antenna 30 in the second working frequency band.

[0184] In other embodiments, the second branch segment 22 may also be opposite to the parasitic branch segment 12 , and the first branch segment 21 may be opposite to the main radiation branch segment 11 , which is not specifically limited in the present application.

[0185] In some embodiments, please refer to Fig. 9 and Fig.10 , Fig.10 for Fig. 9 The structure diagram of the parasitic branch 2 in the electronic device 100 is shown, and the second branch segment 22 has a first grounding point P1. The first grounding point P1 is not an actual point, but refers to the position on the second branch segment 22 coupled to the reference ground.

[0186] One end of the second branch segment 22 facing the first branch segment 21 is the first end D1 . Along the length direction of the second branch segment 22 , the first grounding point P1 is spaced apart from the first end D1 .

[0187] Based on this, the first grounding point P1 can be located at the end of the second branch segment 22 away from the first branch segment 21, or at the middle section in the length direction of the second branch segment 22. This embodiment and the following embodiments are exemplified by the first grounding point P1 being located at the end of the second branch segment 22 away from the first branch segment 21.

[0188] The portion of the second branch segment 22 located between the first grounding point P1 and the first end D1 is the second sub-branch segment 22a. When the filter device is in the on state, the first branch segment 21, the second sub-branch segment 22a and the filter device 23 form a second whole, and the electrical length of the second whole is greater than or equal to 1 / 4 times the wavelength corresponding to the above frequency f2, and less than or equal to 1 / 4 times the wavelength corresponding to the above frequency f1. In this way, when the filter device is in the on state, the second whole forms a 1 / 4 times wavelength parasitic branch, and this structure is simple and the size design is reasonable.

[0189] When the first grounding point P1 is located at the end of the second branch segment 22 away from the first branch segment 21, the second branch segment 22 as a whole forms a second sub-branch segment 22a, and the above-mentioned first whole forms a second whole. The second branch segment 22 as a whole participates in radiation, which can improve the utilization rate of the second branch segment 22.

[0190] It should be noted that in the above embodiment and the following embodiments, the electrical length L' describing a branch can be calculated by the following formula: L'=L1 / λ, where λ refers to the wavelength of the electromagnetic wave transmitted in the branch.

[0191] Please continue reading Fig. 9 and Fig.10 When the filter device 23 is in the blocking state, the first branch segment 21 is suspended, that is, the first branch segment 21 is not grounded. Based on this, the electrical length of the first branch segment 21 is greater than or equal to 1 / 2 times the wavelength corresponding to the frequency f4, and less than or equal to 1 / 2 times the wavelength corresponding to the frequency f3. In this way, when the filter device is in the blocking state, the first branch segment 21 forms a 1 / 2 wavelength parasitic branch, which has a simple structure and a reasonable size design.

[0192] In some embodiments, please refer to Fig. 9 and Fig.10 In the second working frequency band, in order to reduce the influence of the second branch segment 22a on the radiation efficiency of the main antenna 1, in some embodiments, the electrical length of the second branch segment 22 is less than or equal to 1 / 4 times the wavelength corresponding to the maximum frequency of the second working frequency band. In this way, in the first working frequency band and the second working frequency band, the electrical length of the second branch segment 22 is short and cannot be excited to generate reverse current, thereby reducing the influence on the radiation efficiency of the main antenna 1.

[0193] The above embodiments have introduced the structure of the parasitic stub 2 , and the structure of the filter device 23 will be described in detail below.

[0194] The filter device 23 may include a lumped element, which may be an inductor, or a circuit obtained by connecting an inductor and a capacitor in parallel, in series, or in series-parallel connection.

[0195] In some embodiments, see Fig.11 , Fig.11 This is a schematic diagram of the structure of the filter device 23 provided in some embodiments of the present application. Specifically, Fig.11 (a) is a top view of the filter device 23. Fig.11 (b) is a front view of the filter device 23. The filter device 23 may also include a printed circuit board (PCB) 231, on which the lumped element may be disposed, and the filter device 23 is connected between the first branch segment 21 and the second branch segment 22 by means of the PCB 231. This structure is simple and modular, and is convenient for production and installation.

[0196] In some other embodiments, the filter device 23 may include distributed elements, which form an inductor, or form a circuit obtained by connecting an inductor and a capacitor in parallel, in series, or in series-parallel connection.

[0197] For examples, see Fig.12 , Fig.12 This is a schematic diagram of the structure of the filter device 23 provided in some embodiments of the present application, specifically, Fig.12 (a) is a three-dimensional diagram of the filter device 23. Fig.12 (b) in the figure is a cross-sectional view of the filter device 23. The filter device 23 may include a metal insert 232, a metal layer 233 and a non-metallic material 234. The metal insert 232 is embedded in the non-metallic material 234, and the metal insert 232 is located between the first branch segment 21 and the second branch segment 22, and is electrically conductive with the first branch segment 21 and the second branch segment 22. In some embodiments, the metal insert 232 may be integrally formed with the first branch segment 21 and the second branch segment 22. In other embodiments, the metal insert 232 may also be electrically conductive with the first branch segment 21 and the second branch segment 22 by welding, direct contact, conductive adhesive bonding, etc. The cross-sectional area of ​​the metal insert 232 is smaller than the cross-sectional area of ​​the first branch segment 21 and the cross-sectional area of ​​the second branch segment 22. In this way, the metal insert 232 forms an inductor. The metal layer 233 is disposed on the surface of the non-metal material 234 , and two ends of the metal layer 233 form capacitors with the first branch segment 21 and the second branch segment 22 , respectively.

[0198] In this way, the filter element 23 is in the form of an MDA structure, which is simple in structure and easy to form.

[0199] For another example, see Fig.13 , Fig.13A schematic diagram of the structure of a filter device 23 provided in some embodiments of the present application. The filter device 23 includes a metal layer, and the metal layer includes a first metal region 235, a second metal region 236, and a third metal region 237. The two ends of the first metal region 235 are electrically connected to the first branch segment 21 and the second branch segment 22, respectively, and the width of the middle part is smaller to form a first inductor L1. The second metal region 236 is located on one side of the first metal region 235, and the second metal region 236 forms a second inductor L2. The two ends of the second metal region 236 form a first capacitor C1 and a second capacitor C2 with the first metal region 235 through an interdigital structure. The third metal region 237 is located on the side of the first metal region 235 that is opposite to the second metal region 236, and the third metal region 237 forms a third inductor L3. The two ends of the third metal region 237 form a third capacitor C3 and a fourth capacitor C4 with the first metal region 235 through an interdigital structure. Please refer to Fig.14 , Fig.14 for Fig.13 The circuit diagram corresponding to the filter device 23 is shown.

[0200] For another example, see Fig.15 , Fig.15 The following is a schematic diagram of the structure of the filter device 23 provided in some other embodiments of the present application. The filter device 23 includes a metal layer, and the metal layer includes a fourth metal region 238, a fifth metal region 239, a sixth metal region 240, a seventh metal region 241 and an eighth metal region 242. The fourth metal region 238 forms a fourth inductor L4. The fifth metal region 239 and the sixth metal region 240 are located on one side of the fourth metal region 238, the fifth metal region 239 forms a fifth inductor L5, the sixth metal region 240 forms a sixth inductor L6, and a fifth capacitor C5 is formed between the fifth metal region 239 and the sixth metal region 240. The seventh metal region 241 and the eighth metal region 242 are located on the other side of the fourth metal region 238, the seventh metal region 241 forms a seventh inductor L7, the eighth metal region 242 forms an eighth inductor L8, and a sixth capacitor C6 is formed between the seventh metal region 241 and the eighth metal region 242. Please refer to Fig.16 , Fig.16 for Fig.15 The circuit diagram corresponding to the filter device 23 is shown.

[0201] exist Fig.13 and Fig.15In the embodiment shown, the filter element 23 can be a flexible printed circuit (FPC) board structure, or a metal layer structure formed by a laser direct structuring (LDS) process, or a metal layer structure formed by a printing direct structuring (PDS) process. This structure is simple and easy to implement.

[0202] To verify the effect of the antenna 30 provided in the embodiment of the present application, please refer to Fig.17 , Fig.17 The front view of the electronic device 100 in the folded state provided in some other embodiments of the present application. In this embodiment, in the antenna 30, the first operating frequency band of the main antenna 1 is the Wi-Fi 2.4G frequency band, and the specific frequency range is 2.4GHz-2.5GHz. Based on this, the above-mentioned first frequency interval is [2.3GHz, 3GHz]. The parasitic branch 2 is the above-mentioned second whole, and the parasitic branch 2 is a parasitic branch of 1 / 4 times the wavelength.

[0203] See also Fig.18 , Fig.18 for Fig.17 The input return loss (S11) of the antenna 30 in the electronic device 100 is shown as a function of frequency when the physical length of the parasitic branch 2 is 12.75 mm, 13.75 mm, 14.75 mm, 16.75 mm and when there is no parasitic branch 2. Fig.18 It can be seen that within the 1GHz-4GHz frequency band, when there is no parasitic branch 2, there is one resonant wave, which is generated by the main antenna 1; after setting the parasitic branch 2, there are two resonant waves, one resonant wave is generated by the main antenna 1, and the other is generated by the main antenna 1. Fig.18 The main mode is marked in the figure, and the other resonant wave is generated by parasitic branch 2.

[0204] When the physical length of parasitic branch 2 is 12.75mm, the lowest point of the resonant wave generated by parasitic branch 2 is 1, and the coordinates are (3.117GHz, -6.2428dB). When the physical length of parasitic branch 2 is 13.75mm, the lowest point of the resonant wave generated by parasitic branch 2 is 2, and the coordinates are (2.975GHz, -8.6377dB). When the physical length of parasitic branch 2 is 14.75mm, the lowest point of the resonant wave generated by parasitic branch 2 is 3, and the coordinates are (2.688GHz, -17.286dB). When the physical length of parasitic branch 2 is 16.75mm, the lowest point of the resonant wave generated by parasitic branch 2 is 4, and the coordinates are (2.2625GHz, -8.1461dB).

[0205] As the physical length of the parasitic stub 2 increases, the center frequency of the resonant wave generated by the parasitic stub 2 gradually moves toward a low frequency.

[0206] See also Fig.19 and Table 2 below, Fig.19 for Fig.17 The radiation efficiency of the antenna 30 in the electronic device 100 shown in FIG. 1 varies with frequency when the physical length of the parasitic branch 2 is 12.75 mm, 13.75 mm, 14.75 mm, 16.75 mm and when there is no parasitic branch 2. Table 2 records the radiation efficiency of the antenna 30 in the electronic device 100 shown in FIG. 1 . Fig.17 In the electronic device 100 shown, the antenna 30 is in the first working frequency band (ie, the Wi-Fi 2.4G frequency band), and the physical lengths of the parasitic branches 2 are 12.75 mm, 13.75 mm, 14.75 mm, 16.75 mm, and the average value of the radiation efficiency when there is no parasitic branch 2.

[0207] Table 2

[0208] Antenna environment Average radiation efficiency of Wi-Fi 2.4G band (dB) No parasitic branches -3.61 The physical length of the parasitic branch is 12.75 mm -2.96 The physical length of the parasitic branch is 13.75 mm -2.76 The physical length of the parasitic branch is 14.75 mm -2.34 The physical length of the parasitic branch is 16.75 mm -8.85

[0209] Depend on Fig.19 As can be seen from Table 2, as the physical length of the parasitic branch 2 increases, the radiation efficiency of the antenna 30 in the first working frequency band gradually increases. When the center frequency of the resonant wave generated by the parasitic branch 2 is less than the minimum frequency of the first frequency interval, the efficiency pit moves to the first working frequency band, and the performance of the antenna 30 deteriorates. In the first frequency interval [2.3 GHz, 3 GHz], by adding the parasitic branch 2, the radiation performance of the antenna 30 in the first working frequency band can be improved by about 1.3 dB.

[0210] See also Fig. 20 , Fig. 20 for Fig.17 The electric field distribution diagrams of the antenna 30 in the electronic device 100 at the frequency points of 2.5 GHz, 2.96 GHz and 3.2 GHz are shown when the physical length of the parasitic branch 2 is 13.75 mm. Fig. 20 (a) in FIG. 1 shows the electric field distribution diagram of the antenna 30 at a frequency of 2.5 GHz. Fig. 20 (b) in FIG. 3 shows the electric field distribution diagram of the antenna 30 at the frequency point of 2.96 GHz. Fig. 20 (c) in FIG. 3 shows the electric field distribution diagram of the antenna 30 at a frequency of 3.2 GHz.

[0211] Depend on Fig. 20As can be seen from (a) in the figure, the left-hand mode of the main radiation branch segment 11 is at the 2.5 GHz frequency point, and the current of the parasitic branch segment 2 is distributed in the same direction as the current of the main radiation branch segment 11. When the antenna 30 transmits or receives signals with the help of the main radiation branch segment 11, it also transmits or receives signals with the help of the parasitic branch segment 2, thereby improving the radiation efficiency of the antenna 30. Fig. 20 As can be seen from (b) in FIG. 2 , the parasitic mode of the parasitic branch 2 is at the frequency point of 2.96 GHz, and the current of the main radiation branch segment 11 is opposite to the current of the parasitic branch 2. Fig. 20 As can be seen from (c) in FIG. 3 , at the frequency point of 3.2 GHz, the current of the main radiation branch segment 11 and the current of the parasitic branch segment 2 are distributed in opposite directions with equal amplitude, presenting an efficiency pit.

[0212] See also Fig.21 , Fig.21 for Fig.17 The radiation efficiency of the antenna 30 in the electronic device 100 shown in the figure varies with frequency when the physical length of the parasitic branch 2 is 12.75mm, 13.75mm, 14.75mm, 16.75mm and when there is no parasitic branch 2. The second working frequency band is the Wi-Fi 5G frequency band, and the frequency range is 5.15GHz-5.85GHz. Fig.21 It can be seen that as the physical length of the parasitic branch 2 increases, the antenna efficiency of the antenna 30 in the second working frequency band gradually decreases. This is because the parasitic branch 2 blocks the radiation environment of the main antenna 1 .

[0213] See also Fig. 22 , Fig. 22 A front view of an electronic device 100 in a folded state provided in some other embodiments of the present application. In this embodiment, in the antenna 30, the second operating frequency band of the main antenna 1 is the Wi-Fi 5G frequency band, and the specific frequency range is 5.15GHz-5.85GHz. Based on this, the above-mentioned second frequency range is [4.65GHz, 6.35GHz]. The parasitic branch 2 includes a first branch segment 21 and a second branch segment 22 arranged at intervals, and the first branch segment 21 is suspended.

[0214] See also Fig.23 , Fig.23 for Fig. 22 The input return loss (S11) of the antenna 30 in the electronic device 100 is shown as a function of frequency when the physical length of the first branch section 21 is 10.75 mm, 12.75 mm, 14.75 mm and when there is no parasitic branch 2. Fig.23 It can be seen that within the 4 GHz-7 GHz frequency band, compared with the case without the parasitic branch 2, after the parasitic branch 2 is set, a new resonant wave is added, and the new resonant wave is generated by the first branch segment 21. The resonant mode of the main antenna 1 is Fig.23 It is still marked as main mode.

[0215] When the physical length of the first branch segment 21 is 10.75mm, the lowest point of the resonant wave generated by the parasitic branch 2 is 1, and the coordinates are (5.278GHz, -31254dB). When the physical length of the first branch segment 21 is 12.75mm, the lowest point of the resonant wave generated by the parasitic branch 2 is 2, and the coordinates are (5.12GHz, -18.808dB). When the physical length of the first branch segment 21 is 14.75mm, the lowest point of the resonant wave generated by the parasitic branch 2 is 3, and the coordinates are (4.76GHz, -9.9767dB).

[0216] As the physical length of the first branch segment 21 increases, the center frequency of the resonant wave generated by the parasitic branch 2 gradually moves toward a low frequency, thereby widening the working bandwidth of the antenna 30 .

[0217] See also Fig.24 and Table 3 below, Fig.24 for Fig. 22 The radiation efficiency of the antenna 30 in the electronic device 100 shown in FIG. 1 varies with frequency when the physical length of the first branch section 21 is 10.75 mm, 12.75 mm, 14.75 mm and when there is no parasitic branch 2. Table 3 records the radiation efficiency of the antenna 30 in the electronic device 100 shown in FIG. 1 . Fig. 22 In the electronic device 100 shown, the antenna 30 is in the second working frequency band (that is, the Wi-Fi 5G frequency band), and the physical lengths of the first branch segment 21 are 10.75 mm, 12.75 mm, 14.75 mm, and the average value of the radiation efficiency when there is no parasitic branch 2.

[0218] Table 3

[0219] Antenna environment Average radiation efficiency of Wi-Fi 5G frequency band (dB) No parasitic branches -2.31 The physical length of the first branch segment is 10.75 mm -2.16 The physical length of the first branch segment is 12.75 mm -2.35 The physical length of the first branch segment is 14.75 mm -2.96

[0220] Depend on Fig.24 As can be seen from Table 3, as the physical length of the first branch segment 21 increases, the average radiation efficiency of the antenna 30 in the second working frequency band gradually decreases. When the physical length of the first branch segment 21 is too long, the efficiency pit moves to the second working frequency band, and the performance of the antenna 30 deteriorates significantly. In the second frequency range [4.65GHz, 6.35GHz], by adding the above-mentioned parasitic branch 2, the radiation performance of the antenna 30 in the second working frequency band can be improved by about 0.2dB.

[0221] See also Fig.25 , Fig.25 for Fig. 22 The electric field distribution diagrams of the antenna 30 in the electronic device 100 at the frequency points of 5.12 GHz, 5.45 GHz and 5.8 GHz are shown when the physical length of the first branch segment 21 is 12.75 mm. Fig.25 (a) in FIG. 1 shows the electric field distribution diagram of the antenna 30 at a frequency of 5.12 GHz. Fig.25 (b) in FIG. 3 shows the electric field distribution diagram of the antenna 30 at a frequency of 5.45 GHz. Fig.25 (c) in FIG. 3 shows the electric field distribution diagram of the antenna 30 at a frequency of 5.8 GHz.

[0222] Depend on Fig.25 As can be seen from (a) in FIG. 5 , at the 5.12 GHz frequency point, the parasitic mode with 1 / 2 times the wavelength of the first branch segment 21 is dominant, and the current direction of the main antenna 1 is the same as the current direction of the first branch segment 21. When the antenna 30 transmits or receives signals with the help of the main antenna 1, it also transmits or receives signals with the help of the first branch segment 21, thereby improving the radiation efficiency of the antenna 30. Fig.25 It can be seen from (b) and (c) in that at the frequencies of 5.45 GHz and 5.8 GHz, the electric field peaks of the main antenna 1 and the first branch segment 21 appear at different phases, and their mutual influence is small.

[0223] See also Fig.26 , Fig.26 for Fig. 22 The radiation efficiency of the first working frequency band of the antenna 30 in the electronic device 100 shown in the figure varies with frequency when the physical length of the first branch segment 21 is 10.75mm, 12.75mm, 14.75mm respectively, and when there is no parasitic branch 2. The first working frequency band is the Wi-Fi 2.4G band, and the frequency range is 2.4GHz-2.5GHz. Fig.26 It can be seen that since the electrical length of the first branch segment 21 is much smaller than 1 / 2 of the wavelength corresponding to 2.5 GHz, it cannot generate a corresponding parasitic mode in the first working frequency band, and therefore has no obvious improvement effect on the performance of the antenna 30 in the first working frequency band.

[0224] See also Fig. 27 , Fig. 27 for Fig. 9 The input return loss (S11), radiation efficiency and system efficiency of the antenna 30 in the electronic device 100 are shown as a function of frequency. Fig. 27 It can be seen that the parasitic branch 2 can generate parasitic resonance in the first working frequency band (such as the Wi-Fi 2.4G band) and the second working frequency band (such as the Wi-Fi 5G band) by setting the filter device 23, thereby improving the radiation performance of the antenna 30 when the electronic device 100 is in a folded form.

[0225] See also Fig.28 , Fig.28 for Fig. 9The electric field distribution diagram of the antenna 30 in the electronic device 100 at the frequency points of 2.4 GHz, 2.62 GHz, 5.36 GHz and 5.62 GHz is shown. Specifically, Fig.28 (a) in FIG. 1 shows the electric field distribution diagram of the antenna 30 at the 2.4 GHz frequency point. Fig.28 (b) in FIG. 1 shows the electric field distribution diagram of the antenna 30 at the frequency point of 2.62 GHz. Fig.28 (c) in FIG. 3 shows the electric field distribution diagram of the antenna 30 at the frequency point of 5.36 GHz. Fig.28 (d) in the figure represents the electric field distribution diagram of antenna 30 at 5.62 GHz. In the first working frequency band, antenna 30 has two modes, a parasitic mode of 1 / 4 times the wavelength of the second whole at 2.62 GHz, which can improve the antenna efficiency of the main mode. In the second working frequency band, antenna 30 also has two modes, a parasitic mode of 1 / 2 times the wavelength of the first branch segment at 5.36 GHz, which can widen the bandwidth of the second working frequency band.

[0226] See also Fig.29 , Fig.30 and Fig.31 , Fig.29 for Fig. 9 The antenna 30, Fig. 9 When the electronic device 100 is in the unfolded state, the internal antenna 30 is connected to the Figure 7 The radiation efficiency (Rad.Eff) and system efficiency (Tot.Eff) of the antenna 30 in the folded electronic device 100 are shown as a curve diagram of changes with frequency (Frequency); Fig.30 for Fig. 9 The antenna 30, Fig. 9 When the electronic device 100 is in the unfolded state, the internal antenna 30 is connected to the Figure 7 A curve diagram showing the variation of the system efficiency (Tot. Eff) of the antenna 30 in the folded electronic device 100 with respect to the frequency (Frequency); Fig.31 for Fig. 9 The antenna 30 in the electronic device 100 in the folded state is Fig.17 The antenna 30, Fig. 22 The graph shows the change of the radiation efficiency (Rad.Eff) and the system efficiency (Tot.Eff) of the antenna 30 in the electronic device 100 in the folded state with the frequency (Frequency).

[0227] Fig. 9 The main antenna 1 of the antenna 30 in the electronic device 100 is Figure 7 , Fig.17 as well as Fig. 22 The main antenna 1 of the antenna 30 in the electronic device 100 is the same. In the unfolded state, the parasitic branches 2 and the suspended branches n on the second shell 202 have little effect on the main antenna 1. Based on this, Fig. 9 When the electronic device 100 is in the unfolded state, the internal antenna 30 is connected to the Figure 7 , Fig.17 as well as Fig. 22 The radiation efficiency of the internal antenna 30 of the electronic device 100 shown in the unfolded state is substantially the same, so Figure 29-Figure 31 Only Fig. 9 The curve diagram of the radiation efficiency (Rad.Eff) and the system efficiency (Tot.Eff) of the internal antenna 30 of the electronic device 100 when in the unfolded state versus frequency (Frequency) is shown for comparison.

[0228] For the convenience of description, Figure 7 The antenna 30 in the electronic device 100 in the folded state is shown. Figure 29-Figure 31 In the figure, it is represented as “Scheme 2 folding state”. Fig. 9 The antenna 30 in the electronic device 100 in the folded state is shown. Figure 29-Figure 31 In the figure, it is represented as “Scheme 3 folded state”. Fig. 9 When the electronic device 100 is in the unfolded state, the internal antenna 30 is Figure 29-Figure 31 In the figure, it is represented as "Scheme 3 expanded state", Fig.17 The antenna 30 in the electronic device 100 in the folded state is shown. Figure 29-Figure 31 In the figure, it is represented as “Scheme 4 folded state”. Fig. 22 The antenna 30 in the electronic device 100 in the folded state is shown. Figure 29-Figure 31 It is represented as “Scheme 5 folded state”.

[0229] Among them, the average system efficiency (Tot.Eff) of "Scheme 3 unfolded state", "Scheme 2 folded state", "Scheme 3 folded state", "Scheme 4 folded state" and "Scheme 5 folded state" in the above-mentioned first working frequency band (for example, Wi-Fi 2.4G band) and the second working frequency band (for example, Wi-Fi 5G band) are recorded in Table 4 below.

[0230] Table 4

[0231] Antenna environment Average system efficiency of Wi-Fi 2.4G band (dB) Average system efficiency of Wi-Fi 5G band (dB) Scheme 3: Expanded state -3.48 -2 Scheme 2 Folded state -5.06 -2.94 Scheme 3: Folded state -3.5 -2.6 Scheme 4: Folded state -3.55 -3.45 Scheme 5: Folded state -4.95 -2.44

[0232] Depend on Figure 29-Figure 31 As shown in Table 4, compared with Figure 7 , Fig.17 and Fig. 22 The antenna 30 in the electronic device 100 is shown. Fig. 9The performance of the antenna 30 in the electronic device 100 in the folded state in the two working frequency bands is slightly different from that in the unfolded state, and the specific difference is within 0.6dB. Therefore, it is possible to take into account the performance improvement of the two working frequency bands at the same time, and the performance is better.

[0233] To sum up, the use of the parasitic branch 2 with the filter device 23 can simultaneously improve the performance of the antenna 30 in two working frequency bands, and can ensure that the radiation performance of the antenna 30 of the folding screen device in the folded state is roughly the same as the radiation performance of the antenna 30 in the unfolded state.

[0234] It should be noted that the above embodiments are exemplified by assuming that the second whole is a parasitic branch with a quarter wavelength and the first branch segment 21 is a parasitic branch with a half wavelength.

[0235] In some other embodiments, the second whole may also be a 3 / 4, 5 / 4, 7 / 4, ... times wavelength parasitic branch. In other words, the second whole forms a (1 / 4+M / 2) times wavelength parasitic branch, where M is 0 or a positive integer. The electrical length of the second whole is greater than or equal to (1 / 4+M / 2) times the wavelength corresponding to the frequency f2, and less than or equal to (1 / 4+M / 2) times the wavelength corresponding to the frequency f1.

[0236] In some other embodiments, the first branch segment 21 may also be a 1, 3 / 2, 2, 5 / 2, ... times wavelength parasitic branch. In other words, the first branch segment 21 forms a (1 / 2+N / 2) times wavelength parasitic branch, where N is 0 or a positive integer. The electrical length of the first branch segment 21 is greater than or equal to (1 / 2+N / 2) times the wavelength corresponding to the frequency f4, and less than or equal to (1 / 2+N / 2) times the wavelength corresponding to the frequency f3.

[0237] It should be noted that the above embodiment is exemplified by grounding the end of the second branch segment 22 away from the first branch segment 21, and floating the end of the first branch segment 21 away from the second branch segment 22, that is, the boundary condition of the second branch segment 22 is a perfect electric conductor (PEC) boundary condition, and the boundary condition of the first branch segment 21 is a perfect magnetic conductor (PMC) boundary condition.

[0238] In some other embodiments, the boundary condition of the second branch segment 22 may also be a perfect magnetic conductor (PMC) boundary condition, and the boundary condition of the first branch segment 21 may also be a perfect electric conductor (PEC) boundary condition. Alternatively, the boundary condition of the second branch segment 22 and the boundary condition of the first branch segment 21 are both perfect magnetic conductor (PMC) boundary conditions. Alternatively, the boundary condition of the second branch segment 22 and the boundary condition of the first branch segment 21 are both perfect electric conductor (PEC) boundary conditions.

[0239] For examples, see Fig.32 and Fig.33 , Fig.32 This is a front view of the electronic device 100 in a folded state provided in some embodiments of the present application. Fig.33 for Fig.32 The structure diagram of the parasitic branch 2 in the electronic device 100 is shown. In this embodiment, the second branch segment 22 has the first grounding point P1, and the portion of the second branch segment 22 between the first grounding point P1 and the first end D1 is the second sub-branch segment 22a.

[0240] Similarly, the first branch segment 21 has a second grounding point P2 coupled to the reference ground. The end of the first branch segment 21 facing the second branch segment 22 is the second end D2. Along the length direction of the first branch segment 21, the second grounding point P2 is spaced apart from the second end D2.

[0241] Based on this, the second grounding point P2 can be located at the end of the first branch segment 21 away from the second branch segment 22, or at the middle section in the length direction of the first branch segment 21. This embodiment and the following embodiments are exemplified by the second grounding point P2 being located at the end of the first branch segment 21 away from the second branch segment 22.

[0242] The portion of the first branch segment 21 located between the second grounding point P2 and the second end D2 is the first sub-branch segment 21 a .

[0243] In this way, the boundary conditions of the second branch segment 22 and the boundary conditions of the first branch segment 21 are both perfect electric conductor (PEC) boundary conditions.

[0244] When the filter device is in the on state, the first sub-branch segment 21a, the second sub-branch segment 22a and the filter device 23 form a third whole, and the third whole forms a ring mode parasitic branch. The electrical length of the third whole is greater than or equal to (1 / 2+M / 2) times the wavelength corresponding to the frequency f2, and less than or equal to (1 / 2+M / 2) times the wavelength corresponding to the frequency f1.

[0245] When the filter device is in a blocking state, the first sub-branch segment 21a forms a (1 / 4+N / 2) times wavelength parasitic branch. The electrical length of the first sub-branch segment 21a is greater than or equal to (1 / 4+N / 2) times the wavelength corresponding to the frequency f4, and less than or equal to (1 / 4+N / 2) times the wavelength corresponding to the frequency f3.

[0246] This structure is simple and easy to operate.

[0247] For another example, see Fig.34 and Fig.35 , Fig.34 This is a front view of the electronic device 100 in a folded state provided in some embodiments of the present application. Fig.35 for Fig.34 The schematic diagram of the structure of the parasitic branch 2 in the electronic device 100 is shown. In this embodiment, the second branch segment 22 is suspended, and the first branch segment 21 has the second grounding point P2. In this way, the boundary conditions of the second branch segment 22 are perfect magnetic conductor (PMC) boundary conditions, and the boundary conditions of the first branch segment 21 are perfect electric conductor (PEC) boundary conditions.

[0248] When the filter device is in the on state, the first sub-branch segment 21a, the second branch segment 22 and the filter device 23 form a fourth whole, and the fourth whole forms a (1 / 4+M / 2) times wavelength parasitic branch. The electrical length of the fourth whole is greater than or equal to (1 / 4+M / 2) times the wavelength corresponding to the frequency f2, and less than or equal to (1 / 4+M / 2) times the wavelength corresponding to the frequency f1.

[0249] When the filter device is in a blocking state, the first sub-branch segment 21a forms a (1 / 4+N / 2) times wavelength parasitic branch. The electrical length of the first sub-branch segment 21a is greater than or equal to (1 / 4+N / 2) times the wavelength corresponding to the frequency f4, and less than or equal to (1 / 4+N / 2) times the wavelength corresponding to the frequency f3.

[0250] This structure is simple and easy to operate.

[0251] For more examples, see Fig.36 , Fig.36 The front view of the electronic device 100 in the folded state provided in some embodiments of the present application. In this embodiment, the parasitic branch 2 is suspended, and the boundary conditions of the second branch segment 22 and the boundary conditions of the first branch segment 21 are both perfect magnetic conductor (PMC) boundary conditions.

[0252] When the filter device is in the on state, the first branch segment 21, the second branch segment 22 and the filter device 23 form a first whole that is a (1 / 2+M / 2)-times wavelength parasitic branch. The electrical length of the first whole is greater than or equal to (1 / 2+M / 2) times the wavelength corresponding to the frequency f2, and less than or equal to (1 / 2+M / 2) times the wavelength corresponding to the frequency f1.

[0253] When the filter device is in a blocking state, the first branch segment 21 forms a (1 / 2+N / 2)-times wavelength parasitic branch. The electrical length of the first branch segment 21 is greater than or equal to (1 / 2+N / 2) times the wavelength corresponding to the frequency f4, and less than or equal to (1 / 2+N / 2) times the wavelength corresponding to the frequency f3.

[0254] This structure is simple and easy to operate.

[0255] In some other embodiments, see Fig.37 , Fig.37 The front view of the electronic device 100 in a folded state provided for some other embodiments of the present application. When the electronic device 100 is in a folded state, the shell is in a folded state, and the parasitic branch 2 has a capacitive coupling effect with the radiation branch of the main antenna 1. The filter device 23 is in a blocking state at least when the signal frequency is in a first frequency interval, and is in a conducting state when the signal frequency is in a second frequency interval. Among them, the signal frequency refers to the signal frequency entering the filter device 23. The first frequency interval may be the same as the first frequency interval in any of the aforementioned embodiments, and the first frequency interval may be the same as the second frequency interval in any of the aforementioned embodiments, which will not be repeated here.

[0256] In some embodiments, the filter device 23 can be in a blocking state in a larger interval range including the first frequency interval, and in a conducting state in a larger interval range including the second frequency interval. For example, the filter device 23 is in a blocking state when the signal frequency is less than the second preset threshold, and is in a conducting state when the signal frequency is greater than or equal to the preset threshold. Among them, the second preset threshold can be greater than the maximum frequency of the first frequency interval and less than the minimum frequency of the second frequency interval. In this way, the filter device 23 is a low-impedance high-pass device, which has a simple structure and is easy to implement.

[0257] In other embodiments, the filter device 23 may be in a blocking state in the first frequency interval, and in a conducting state in other frequency intervals outside the first frequency interval, and the other frequency intervals include the second frequency interval. The filter device 23 may also be in a conducting state in the second frequency interval, and in a blocking state in other frequency intervals outside the second frequency interval, and the other frequency intervals include the first frequency interval.

[0258] The filter device 23 may include a lumped element, which may be a capacitor, or a circuit obtained by connecting an inductor and a capacitor in parallel, in series, or in series-parallel. The filter device 23 may also include a distributed element, which forms a capacitor, or forms a circuit obtained by connecting an inductor and a capacitor in parallel, in series, or in series-parallel. The structural form of the filter device 23 includes but is not limited to a PCB structural form, an FPC board structural form, a metal layer structural form formed by an LDS process, or a metal layer structural form formed by a PDS process.

[0259] On the basis of the above, when the filter device is in the blocking state, the second branch segment 22 is capacitively coupled with the radiation branch of the main antenna 1, and generates a third parasitic resonance within the first frequency range, that is, the resonance center frequency of the third parasitic resonance is located within the first frequency range. When the filter device is in the on state, the first branch segment 21, the second branch segment 22 and the filter device 23 form a first whole, which is capacitively coupled with the radiation branch of the main antenna 1, and generates a fourth parasitic resonance within the second frequency range, and the resonance center frequency of the fourth parasitic resonance is located within the second frequency range.

[0260] In this way, within the first working frequency band, the filter device 23 is in a blocking state, the first branch segment 21 and the second branch segment 22 are independent of each other, and the antenna 30 radiates energy with the help of the second branch segment 22 in addition to radiating energy with the help of the radiation branches of the main antenna 1. This can compensate to a certain extent for the reduction in the radiation efficiency of the main antenna 1 caused by the folding screen on the second frame B and the second shell 202, thereby improving the radiation efficiency of the antenna 30.

[0261] Similarly, in the second working frequency band, the filter device 23 is in the on state. In addition to the radiation energy of the radiated branches of the main antenna 1, the antenna 30 also uses the first overall radiation energy to compensate to a certain extent for the reduction in the radiation efficiency of the main antenna 1 caused by the folding screen on the second frame B and the second shell 202, thereby improving the radiation efficiency of the antenna 30.

[0262] Therefore, the radiation efficiency of the two working frequency bands of the main antenna 1 can be tuned with the help of the parasitic branch 2. This structure is simple, occupies a small space, and the length of the first whole and the length of the second branch segment 22 do not interfere with each other. Both can be adjusted to the optimal state, which can maximize the radiation efficiency of the antenna 30 in the first working frequency band and the second working frequency band.

[0263] In some embodiments, please refer to Fig.37 , the main antenna 1 can be connected with Fig. 9 The main antenna 1 in the electronic device 100 shown has the same structural form. Optionally, in the first working frequency band, the main radiating branch segment 11 of the main antenna 1 generates resonance, and specifically, the main radiating branch segment 11 can generate left-hand mode resonance. In the second working frequency band, part of the main radiating branch segment 11 between the feeding point P01 and the third end D3 generates monopole mode resonance, and / or part of the main radiating branch segment 11 between the feeding point P01 and the fourth grounding point P03 and the parasitic branch segment 12 generates ring mode resonance, and / or the parasitic branch segment 12 generates parasitic resonance.

[0264] Based on this, when the electronic device 100 is in the folded state, please refer to Fig.37, the second branch segment 22 is opposite to the main radiating branch segment 11, that is, the projection of the second branch segment 22 on the main radiating branch segment 11 along the direction perpendicular to the main radiating branch segment 11 overlaps with the main radiating branch segment 11, and the projection of the main radiating branch segment 11 on the second branch segment 22 along the direction perpendicular to the second branch segment 22 overlaps with the second branch segment 22.

[0265] Similarly, please continue to read Fig.37 , the first branch segment 21 is opposite to the parasitic branch segment 12, that is, the projection of the first branch segment 21 on the parasitic branch segment 12 along the direction perpendicular to the parasitic branch segment 12 overlaps with the parasitic branch segment 12, and the projection of the parasitic branch segment 12 on the first branch segment 21 along the direction perpendicular to the first branch segment 21 overlaps with the first branch segment 21.

[0266] In this way, in the first frequency band, the electric field point is located at the main radiation branch segment 11, and the second branch segment 22 is opposite to the main radiation branch segment 11, which can produce strong capacitive coupling, and the parasitic resonance efficiency generated by the second branch segment 22 is relatively high, which can improve the radiation efficiency of the antenna 30 in the first working frequency band. In the second frequency range, the electric field point is located at the parasitic branch segment 12, and / or at part of the main radiation branch segment 11 between the feeding point P01 and the third end D3, and / or at the gap between the main radiation branch segment 11 and the parasitic branch segment 12. The first whole is opposite to the parasitic branch segment 12, which can produce strong capacitive coupling, and the parasitic resonance efficiency generated by the first whole is relatively high, which can improve the radiation efficiency of the antenna 30 in the second working frequency band.

[0267] In some other embodiments, the second branch segment 22 may also be opposite to the parasitic branch segment 12, and the first branch segment 21 may also be opposite to the main radiation branch segment 11, which is not specifically limited in the present application.

[0268] In some embodiments, please refer to Fig.37 The filter device 23 can be connected between one end of the first branch segment 21 facing the second branch segment 22 and one end of the second branch segment 22 facing the first branch segment 21. In this way, in the second working frequency band, the overall radiation energy of the first branch segment 21 and the second branch segment 22 can be fully utilized, which is conducive to reducing the occupied space of the parasitic branch 2.

[0269] In other embodiments, the filter device 23 may also be connected between the middle section of the first branch segment 21 and the middle section of the second branch segment 22. The following embodiments are further described on the basis that the filter device 23 is connected between the end of the first branch segment 21 facing the second branch segment 22 and the end of the second branch segment 22 facing the first branch segment 21. This cannot be regarded as a special limitation on the present application.

[0270] In some embodiments, please refer to Fig.37 and Fig.38 , Fig.38 for Fig.37 The structure diagram of the parasitic branch 2 in the electronic device 100 is shown. The second branch segment 22 has a first grounding point P1. The first grounding point P1 is not an actual point, but refers to a position on the second branch segment 22 coupled to the reference ground.

[0271] One end of the second branch segment 22 facing the first branch segment 21 is the first end D1 . Along the length direction of the second branch segment 22 , the first grounding point P1 is spaced apart from the first end D1 .

[0272] Based on this, the first grounding point P1 can be located at the end of the second branch segment 22 away from the first branch segment 21, or at the middle section in the length direction of the second branch segment 22. This embodiment and the following embodiments are exemplified by the first grounding point P1 being located at the end of the second branch segment 22 away from the first branch segment 21.

[0273] Please continue reading Fig.37 , the portion of the second branch segment 22 located between the first grounding point P1 and the first end D1 is the second sub-branch segment 22a. When the filter device is in the blocking state, the second sub-branch segment 22a forms a (1 / 4+M / 2) times wavelength parasitic branch, where M is 0 or a positive integer. The electrical length of the second sub-branch segment 22a is greater than or equal to (1 / 4+M / 2) times the wavelength corresponding to the above frequency f2, and less than or equal to (1 / 4+M / 2) times the wavelength corresponding to the above frequency f1.

[0274] When the filter device is in the on state, the first branch segment 21, the second sub-branch segment 22a and the filter device 23 form a second whole, and the second whole forms a (1 / 4+N / 2) times wavelength parasitic branch, where N is 0 or a positive integer. The electrical length of the second whole is greater than or equal to (1 / 4+N / 2) times the wavelength corresponding to the above frequency f4, and less than or equal to (1 / 4+N / 2) times the wavelength corresponding to the above frequency f3. This structure is simple and the layout is reasonable.

[0275] When the first grounding point P1 is located at the end of the second branch segment 22 away from the first branch segment 21, the second branch segment 22 as a whole forms a second sub-branch segment 22a, and the above-mentioned first whole forms a second whole. The second branch segment 22 as a whole participates in radiation, which can improve the utilization rate of the second branch segment 22.

[0276] In some embodiments, please refer to Fig.37 and Fig.38In the first working frequency band, in order to reduce the influence of the first branch segment 21 on the radiation efficiency of the main antenna 1, in some embodiments, the electrical length of the first branch segment 21 is less than or equal to 1 / 4 times the wavelength corresponding to the maximum frequency of the second working frequency band. In this way, in the first working frequency band, the electrical length of the first branch segment 21 is short and cannot be excited to generate reverse current, thereby reducing the influence on the radiation efficiency of the main antenna 1.

[0277] The above embodiment is exemplified by taking the boundary condition of the second branch segment 22 as the perfect electric conductor (PEC) boundary condition and the boundary condition of the first branch segment 21 as the perfect magnetic conductor (PMC) boundary condition.

[0278] In some other embodiments, the boundary condition of the second branch segment 22 may also be a perfect magnetic conductor (PMC) boundary condition, and the boundary condition of the first branch segment 21 may be a perfect electric conductor (PEC) boundary condition. Alternatively, the boundary condition of the second branch segment 22 and the boundary condition of the first branch segment 21 are both perfect magnetic conductor (PMC) boundary conditions. Alternatively, the boundary condition of the second branch segment 22 and the boundary condition of the first branch segment 21 are both perfect electric conductor (PEC) boundary conditions.

[0279] For examples, see Fig.39 and Fig.40 , Fig.39 This is a front view of the electronic device 100 in a folded state provided in some embodiments of the present application. Fig.40 for Fig.39 The structure diagram of the parasitic branch 2 in the electronic device 100 is shown. In this embodiment, the second branch segment 22 has the first grounding point P1, and the portion of the second branch segment 22 between the first grounding point P1 and the first end D1 is the second sub-branch segment 22a.

[0280] Similarly, the first branch segment 21 has a second grounding point P2 coupled to the reference ground. The end of the first branch segment 21 facing the second branch segment 22 is the second end D2. Along the length direction of the first branch segment 21, the second grounding point P2 is spaced apart from the second end D2.

[0281] Based on this, the second grounding point P2 can be located at the end of the first branch segment 21 away from the second branch segment 22, or at the middle section in the length direction of the first branch segment 21. This embodiment and the following embodiments are exemplified by the second grounding point P2 being located at the end of the first branch segment 21 away from the second branch segment 22.

[0282] The portion of the first branch segment 21 located between the second grounding point P2 and the second end D2 is the first sub-branch segment 21 a .

[0283] In this way, the boundary conditions of the second branch segment 22 and the boundary conditions of the first branch segment 21 are both perfect electric conductor (PEC) boundary conditions.

[0284] When the filter device is in a blocking state, the second branch segment 22a forms a parasitic branch with a wavelength of (1 / 4+M / 2). The electrical length of the second branch segment 22 is greater than or equal to (1 / 4+M / 2) times the wavelength corresponding to the frequency f2, and less than or equal to (1 / 4+M / 2) times the wavelength corresponding to the frequency f1.

[0285] When the filter device is in the on state, the first sub-branch segment 21a, the second sub-branch segment 22a and the filter device 23 form a third whole, and the third whole forms a ring mode parasitic branch. The electrical length of the second whole is greater than or equal to (1 / 2+N / 2) times the wavelength corresponding to the frequency f4, and less than or equal to (1 / 2+N / 2) times the wavelength corresponding to the frequency f3.

[0286] The structure is simple and easy to operate.

[0287] For another example, see Fig.41 and Fig.42 , Fig.41 This is a front view of the electronic device 100 in a folded state provided in some embodiments of the present application. Fig.42 for Fig.41 The schematic diagram of the structure of the parasitic branch 2 in the electronic device 100 is shown. In this embodiment, the second branch segment 22 is suspended, and the first branch segment 21 has the second grounding point P2. In this way, the boundary conditions of the second branch segment 22 are perfect magnetic conductor (PMC) boundary conditions, and the boundary conditions of the first branch segment 21 are perfect electric conductor (PEC) boundary conditions.

[0288] When the filter device is in a blocking state, the second branch segment 22 is suspended, and the second branch segment 22 forms a (1 / 2+M / 2)-times wavelength parasitic branch. The electrical length of the second branch segment 22 is greater than or equal to (1 / 2+M / 2) times the wavelength corresponding to the frequency f2, and less than or equal to (1 / 2+M / 2) times the wavelength corresponding to the frequency f1.

[0289] When the filter device is in the on state, the first sub-branch segment 21a, the second branch segment 22 and the filter device 23 form a fourth whole, and the fourth whole forms a (1 / 4+N / 2)-times wavelength parasitic branch. The electrical length of the fourth whole is greater than or equal to (1 / 4+N / 2) times the wavelength corresponding to the frequency f4, and less than or equal to (1 / 4+N / 2) times the wavelength corresponding to the frequency f3.

[0290] The structure is simple and easy to operate.

[0291] For more examples, see Fig.43 , Fig.43 The front view of the electronic device 100 in the folded state provided in some embodiments of the present application. In this embodiment, the parasitic branch 2 is suspended, and the boundary conditions of the second branch segment 22 and the boundary conditions of the first branch segment 21 are both perfect magnetic conductor (PMC) boundary conditions.

[0292] When the filter device is in a blocking state, the second branch segment 22 forms a (1 / 2+M / 2)-times wavelength parasitic branch. The electrical length of the second branch segment 22 is greater than or equal to (1 / 2+M / 2) times the wavelength corresponding to the frequency f2, and less than or equal to (1 / 2+M / 2) times the wavelength corresponding to the frequency f1.

[0293] When the filter device is in the on state, the first branch segment 21, the second branch segment 22 and the filter device 23 form a first whole that is a (1 / 2+N / 2)-times-wavelength parasitic branch. The electrical length of the first whole is greater than or equal to (1 / 2+N / 2) times the wavelength corresponding to the frequency f4, and less than or equal to (1 / 2+N / 2) times the wavelength corresponding to the frequency f3.

[0294] The structure is simple and easy to operate.

[0295] It should be noted that, based on any of the above embodiments, when the electronic device 100 is in the unfolded state, there is no capacitive coupling effect between the parasitic branch 2 and the radiation branch of the main antenna 1 .

[0296] The above embodiments are exemplified by taking the electronic device 100 as a folding screen device. In other embodiments, please refer to Fig.44 and Fig.45 , Fig.44 A perspective view of an electronic device 100 provided in some embodiments of the present application, Fig.45 for Fig.44 The structure diagram of the electronic device 100 when viewed from the direction D is shown. In this embodiment, the electronic device 100 is a candy-bar mobile phone, which includes a screen N and a housing 20. The radiation branch and the parasitic branch 2 of the main antenna 1 of the antenna 30 in the electronic device 100 are arranged on the housing 20, specifically on the frame of the housing 20, and the main antenna 1 and the parasitic branch 2 have a capacitive coupling effect. In this way, the system efficiency of the two working frequency bands of the main antenna 1 can also be improved at the same time.

[0297] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0298] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An antenna, characterized in that: include: A main antenna, the main antenna having a first working frequency band and a second working frequency band, the second working frequency band being higher than the first working frequency band; A parasitic branch, wherein the parasitic branch has a capacitive coupling effect with the radiation branch of the main antenna, the parasitic branch comprises a first branch segment and a second branch segment arranged at an interval, a filter device is connected between the first branch segment and the second branch segment, and the filter device is in a conducting state at least when the frequency of the signal entering the filter device is in a first frequency interval, and is in a blocking state when the frequency of the signal entering the filter device is in a second frequency interval; The first frequency interval includes the first working frequency band, and the second frequency interval includes the second working frequency band; When the filter device is in a conducting state, the first branch segment, the second branch segment and the filter device form a first whole, the first whole is capacitively coupled with the radiation branch of the main antenna, and generates a first parasitic resonance within the first frequency range; When the filter device is in a blocking state, the first branch segment is capacitively coupled with the radiation branch of the main antenna and generates a second parasitic resonance within the second frequency range.

2. The antenna according to claim 1, characterized in that The first frequency interval is [f1, f2]; The f1 is less than the minimum frequency of the first working frequency band, and the difference between the minimum frequency of the first working frequency band and the f1 is greater than 0 and less than or equal to 1 GHz; The f2 is greater than the maximum frequency of the first working frequency band, and the difference between the f2 and the maximum frequency of the first working frequency band is greater than 0 and less than or equal to 1 GHz.

3. The antenna according to claim 2, characterized in that: The difference between the minimum frequency of the first operating frequency band and f1 is equal to 0.1 GHz; The difference between f2 and the maximum frequency of the first working frequency band is equal to 0.5 GHz.

4. The antenna according to any one of claims 1 to 3, characterized in that: The second frequency interval is [f3, f4]; The f3 is less than the minimum frequency of the second operating frequency band, and the difference between the minimum frequency of the second operating frequency band and the f3 is greater than 0 and less than or equal to 1 GHz; The f4 is greater than the maximum frequency of the second working frequency band, and the difference between the f4 and the maximum frequency of the second working frequency band is greater than 0 and less than or equal to 1 GHz.

5. The antenna according to claim 4, characterized in that: The difference between the minimum frequency of the second operating frequency band and f3 is equal to 0.5 GHz; The difference between f4 and the maximum frequency of the second operating frequency band is equal to 0.5 GHz.

6. The antenna according to any one of claims 1 to 5, characterized in that: The end of the second branch segment facing the first branch segment is the first end, the second branch segment has a first grounding point, and along the length direction of the second branch segment, the first grounding point is spaced apart from the first end; the portion of the second branch segment located between the first end and the first grounding point is the second sub-branch segment; When the filter device is in a conducting state, the first branch segment, the second sub-branch segment and the filter device form a second whole, and the second whole is a (1 / 4+M / 2) times wavelength parasitic branch; When the filter device is in a blocking state, the first branch segment is suspended, and the first branch segment is a (1 / 2+N / 2) times wavelength parasitic branch; Wherein, M and N are 0 or positive integers.

7. The antenna according to any one of claims 1 to 5, characterized in that: The end of the second branch segment facing the first branch segment is the first end, the second branch segment has a first grounding point, and along the length direction of the second branch segment, the first grounding point is spaced apart from the first end; the portion of the second branch segment located between the first end and the first grounding point is the second sub-branch segment; One end of the first branch segment facing the second branch segment is the second end, the first branch segment has a second grounding point, along the length direction of the first branch segment, the second grounding point is spaced apart from the second end, and the portion of the first branch segment between the second end and the second grounding point is the first sub-branch segment; When the filter device is in a conducting state, the first sub-branch segment, the second sub-branch segment and the filter device form a third whole, and the third whole is a (1 / 2+M / 2) times wavelength parasitic branch; When the filter device is in a blocking state, the first sub-branch segment is a (1 / 4+N / 2) times wavelength parasitic branch; Wherein, M and N are 0 or positive integers.

8. The antenna according to any one of claims 1 to 5, characterized in that: One end of the first branch segment facing the second branch segment is the second end, the first branch segment has a second grounding point, along the length direction of the first branch segment, the second grounding point is spaced apart from the second end, and the portion of the first branch segment between the second end and the second grounding point is the first sub-branch segment; When the filter device is in a conducting state, the first sub-branch segment, the second branch segment and the filter device form a fourth whole, and the fourth whole is a (1 / 4+M / 2) times wavelength parasitic branch; When the filter device is in a blocking state, the second branch segment is suspended, and the first sub-branch segment is a (1 / 4+N / 2) times wavelength parasitic branch; Wherein, M and N are 0 or positive integers.

9. The antenna according to any one of claims 1 to 5, characterized in that: The parasitic branches are suspended; When the filter device is in a conducting state, a first whole formed by the first branch segment, the second branch segment and the filter device is a (1 / 2+M / 2)-times-wavelength parasitic branch; When the filter device is in a blocking state, the first branch segment is a (1 / 2+N / 2) times wavelength parasitic branch; Wherein, M and N are 0 or positive integers.

10. The antenna according to any one of claims 1 to 9, characterized in that: The filter device includes an inductor or a circuit obtained by connecting an inductor and a capacitor in parallel, in series, or in series-parallel connection.

11. The antenna according to any one of claims 1 to 10, characterized in that: The radiation branches of the main antenna include a main radiation branch segment and a parasitic branch segment; The main radiation branch segment has a feeding point and a third grounding point spaced apart along its length direction, the main radiation branch segment also has a third end, the third end is located on a side of the feeding point away from the third grounding point and spaced apart from the feeding point, the parasitic branch segment is located on a side of the third end away from the feeding point, and the parasitic branch segment has a fourth grounding point; In the first working frequency band, the main radiation branch segment generates resonance; In the second operating frequency band, part of the main radiation branch segment between the feeding point and the third end generates a monopole mode resonance, and / or part of the main radiation branch segment between the feeding point and the fourth grounding point and the parasitic branch segment generates a ring mode resonance, and / or the parasitic branch segment generates a parasitic resonance.

12. The antenna according to claim 11, characterized in that The first branch segment includes a first section, a second section and a third section; The first section is opposite to the parasitic branch section, the second section is opposite to a part of the main radiation branch section between the feeding point and the third end, the third section is connected between the first section and the second section, and the third section is opposite to the gap between the main radiation branch section and the parasitic branch section; The second branch segment is located on a side of the second segment away from the first segment, and the second branch segment is opposite to the main radiation branch segment.

13. The antenna according to any one of claims 1 to 12, characterized in that: The electrical length of the second branch segment is less than or equal to 1 / 4 times the wavelength corresponding to the maximum frequency of the second working frequency band.

14. The antenna according to any one of claims 1 to 13, characterized in that: The first working frequency band is the Wi-Fi 2.4G frequency band, and the second working frequency band is the Wi-Fi 5G frequency band.

15. An antenna, characterized in that: include: A main antenna, the main antenna having a first working frequency band and a second working frequency band, the second working frequency band being higher than the first working frequency band; A parasitic branch, wherein the parasitic branch has a capacitive coupling effect with the radiation branch of the main antenna, the parasitic branch comprises a first branch segment and a second branch segment arranged at an interval, a filter device is connected between the first branch segment and the second branch segment, and the filter device is in a blocking state at least when the frequency of the signal entering the filter device is in a first frequency interval, and is in a conducting state when the frequency of the signal entering the filter device is in a second frequency interval; The first frequency interval includes the first working frequency band, The second frequency interval includes the second operating frequency band; When the filter device is in a blocking state, the second branch segment is capacitively coupled with the radiating branch segment of the main antenna, and generates a third parasitic resonance within the first frequency range; when the filter device is in a conducting state, the first branch segment, the second branch segment and the filter device form a first whole, the first whole is capacitively coupled with the radiating branch segment of the main antenna, and generates a fourth parasitic resonance within the second frequency range.

16. The antenna according to claim 15, characterized in that The first frequency interval is [f1, f2]; The f1 is less than the minimum frequency of the first working frequency band, and the difference between the minimum frequency of the first working frequency band and the f1 is greater than 0 and less than or equal to 1 GHz; The f2 is greater than the maximum frequency of the first working frequency band, and the difference between the f2 and the maximum frequency of the first working frequency band is greater than 0 and less than or equal to 1 GHz.

17. The antenna according to claim 16, characterized in that The difference between the minimum frequency of the first operating frequency band and f1 is equal to 0.1 GHz; The difference between f2 and the maximum frequency of the first working frequency band is equal to 0.5 GHz.

18. The antenna according to any one of claims 15 to 17, characterized in that: The second frequency interval is [f3, f4]; The f3 is less than the minimum frequency of the second operating frequency band, and the difference between the minimum frequency of the second operating frequency band and the f3 is greater than 0 and less than or equal to 1 GHz; The f4 is greater than the maximum frequency of the second working frequency band, and the difference between the f4 and the maximum frequency of the second working frequency band is greater than 0 and less than or equal to 1 GHz.

19. The antenna according to claim 18, characterized in that The difference between the minimum frequency of the second operating frequency band and f3 is equal to 0.5 GHz; The difference between f4 and the maximum frequency of the second operating frequency band is equal to 0.5 GHz.

20. The antenna according to any one of claims 15 to 19, characterized in that: The end of the second branch segment facing the first branch segment is the first end, the second branch segment has a first grounding point, and along the length direction of the second branch segment, the first grounding point is spaced apart from the first end; the portion of the second branch segment located between the first end and the first grounding point is the second sub-branch segment; When the filter device is in a blocking state, the first branch segment is suspended, and the second sub-branch segment is a (1 / 4+N / 2) times wavelength parasitic branch; When the filter device is in a conducting state, the first branch segment, the second sub-branch segment and the filter device form a second whole, and the second whole is a (1 / 4+M / 2) times wavelength parasitic branch; Wherein, M and N are 0 or positive integers.

21. The antenna according to any one of claims 15 to 19, characterized in that: The end of the second branch segment facing the first branch segment is the first end, the second branch segment has a first grounding point, and along the length direction of the second branch segment, the first grounding point is spaced apart from the first end; the portion of the second branch segment located between the first end and the first grounding point is the second sub-branch segment; One end of the first branch segment facing the second branch segment is the second end, the first branch segment has a second grounding point, along the length direction of the first branch segment, the second grounding point is spaced apart from the second end, and the portion of the first branch segment between the second end and the second grounding point is the first sub-branch segment; When the filter device is in a blocking state, the second sub-branch segment is a (1 / 4+N / 2) times wavelength parasitic branch; When the filter device is in a conducting state, the first sub-branch segment, the second sub-branch segment and the filter device form a third whole, and the third whole is a (1 / 2+M / 2)-fold wavelength parasitic branch; Wherein, M and N are 0 or positive integers.

22. The antenna according to any one of claims 15 to 19, characterized in that: One end of the first branch segment facing the second branch segment is the second end, the first branch segment has a second grounding point, along the length direction of the first branch segment, the second grounding point is spaced apart from the second end, and the portion of the first branch segment between the second end and the second grounding point is the first sub-branch segment; When the filter device is in a blocking state, the second branch segment is suspended, and the second branch segment is a (1 / 2+N / 2) times wavelength parasitic branch; When the filter device is in a conducting state, the first sub-branch segment, the second branch segment and the filter device form a fourth whole, and the fourth whole is a (1 / 4+M / 2) times wavelength parasitic branch; Wherein, M and N are 0 or positive integers.

23. The antenna according to any one of claims 15 to 19, characterized in that: The parasitic branches are suspended; When the filter device is in a blocking state, the second branch segment is a (1 / 2+M / 2) times wavelength parasitic branch; When the filter device is in a conducting state, a first whole formed by the first branch segment, the second branch segment and the filter device is a (1 / 2+N / 2)-fold wavelength parasitic branch; Wherein, M and N are 0 or positive integers.

24. The antenna according to any one of claims 15 to 23, characterized in that: The filter device includes a capacitor or a circuit obtained by connecting an inductor and a capacitor in parallel, in series, or in series-parallel connection.

25. The antenna according to any one of claims 15 to 24, characterized in that: The radiation branches of the main antenna include a main radiation branch segment and a parasitic branch segment; The main radiation branch segment has a feeding point and a third grounding point spaced apart along its length direction, the main radiation branch segment also has a third end, the third end is located on a side of the feeding point away from the third grounding point and spaced apart from the feeding point, the parasitic branch segment is located on a side of the third end away from the feeding point, and the parasitic branch segment has a fourth grounding point; In the first working frequency band, the main radiation branch segment generates resonance; In the second working frequency band, part of the main radiation branch segments between the feeding point and the third end generate monopole mode resonance, and / or part of the main radiation branch segments and the parasitic branch segments between the feeding point and the fourth grounding point generate ring mode resonance, and / or the parasitic branch segments generate parasitic resonance; The first branch segment is opposite to the parasitic branch segment, and the second branch segment is opposite to the main radiation branch segment.

26. The antenna according to any one of claims 15 to 25, characterized in that: The electrical length of the first branch segment is less than or equal to 1 / 4 times the wavelength corresponding to the maximum frequency of the second working frequency band.

27. An electronic device, characterized in that: include: case; The antenna described in any one of claims 1-26, wherein the radiation branches of the main antenna in the antenna and the parasitic branches are arranged on the shell.

28. An electronic device, characterized in that: include: A housing, the housing comprising a first housing, a second housing and a rotating shaft mechanism, the rotating shaft mechanism being connected between the first housing and the second housing so as to rotate the housing between a folded state and an unfolded state; when the housing is in the folded state, the first housing and the second housing are stacked; when the housing is in the unfolded state, the first housing and the second housing are arranged side by side; A main antenna, wherein a radiation branch of the main antenna is disposed on the first shell, and the main antenna has a first working frequency band and a second working frequency band, and the second working frequency band is higher than the first working frequency band; A parasitic branch, wherein the parasitic branch is arranged on the second shell, and when the shell is in a folded state, the parasitic branch has a capacitive coupling effect with the radiation branch of the main antenna; wherein, The parasitic branch comprises a first branch segment and a second branch segment which are arranged at intervals, a filter device is connected between the first branch segment and the second branch segment, and the filter device is in a conducting state at least when the frequency of the signal entering the filter device is in a first frequency interval, and is in a blocking state when the frequency of the signal entering the filter device is in a second frequency interval; The first frequency interval includes the first working frequency band, and the second frequency interval includes the second working frequency band; When the filter device is in a conducting state, the first branch segment, the second branch segment and the filter device form a first whole, the first whole is capacitively coupled with the radiation branch of the main antenna, and generates a first parasitic resonance within the first frequency range; When the filter device is in a blocking state, the first branch segment is capacitively coupled with the radiation branch of the main antenna and generates a second parasitic resonance in the second frequency range.

29. An electronic device, characterized in that: include: A housing, the housing comprising a first housing, a second housing and a rotating shaft mechanism, the rotating shaft mechanism being connected between the first housing and the second housing so as to rotate the housing between a folded state and an unfolded state; when the housing is in the folded state, the first housing and the second housing are stacked; when the housing is in the unfolded state, the first housing and the second housing are arranged side by side; A main antenna, wherein a radiation branch of the main antenna is disposed on the first shell, and the main antenna has a first working frequency band and a second working frequency band, and the second working frequency band is higher than the first working frequency band; A parasitic branch, wherein the parasitic branch is arranged on the second shell, and when the shell is in a folded state, the parasitic branch has a capacitive coupling effect with the radiation branch of the main antenna; wherein, The parasitic branch comprises a first branch segment and a second branch segment which are arranged at intervals, a filter device is connected between the first branch segment and the second branch segment, and the filter device is in a blocking state at least when the frequency of the signal entering the filter device is in a first frequency interval, and is in a conducting state when the frequency of the signal entering the filter device is in a second frequency interval; The first frequency interval includes the first working frequency band, and the second frequency interval includes the second working frequency band; When the filter device is in a blocking state, the second branch segment is capacitively coupled with the radiating branch segment of the main antenna, and generates a third parasitic resonance within the first frequency range; when the filter device is in a conducting state, the first branch segment, the second branch segment and the filter device form a first whole, the first whole is capacitively coupled with the radiating branch segment of the main antenna, and generates a fourth parasitic resonance within the second frequency range.

30. The electronic device according to claim 28 or 29, characterized in that: When the shell is in the unfolded state, the parasitic branch has no capacitive coupling effect with the radiation branch of the main antenna.

Images