Antenna and electronic device

Abstract

The present application relates to the technical field of radio frequency antennas, and provides an antenna and an electronic device, capable of improving the radiation efficiency of a multi-band 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 and a radiation branch of the main antenna have a capacitive coupling effect, the parasitic branch comprises a first branch section and a second branch section, a filter device is connected between the first branch section and the second branch section, and the filter device is in a conducting state at least when the signal frequency is within a first frequency range and is in a blocking state when the signal frequency is within a second frequency range. When the filter device is in the conducting state, a first integral structure formed by the first branch section, the second branch section, and the filter device generates first parasitic resonance in the first frequency range. When the filter device is in the blocking state, the first branch section generates second parasitic resonance in the second frequency range. The antenna provided in the present application is applied to a communication system.

Description

Antennas and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on October 23, 2023, with application number 202311383728.2 and invention name “Antenna and Electronic Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of radio frequency antennas, and in particular to an antenna and an electronic device. Background Art

[0003] With the improvement of communication performance and the increase in communication frequency bands, some antennas in electronic devices such as mobile phones, tablets, and laptops need to have more than two operating frequency bands at the same time to reduce the space occupied by the antenna.

[0004] 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 existing technology, a single parasitic branch can often only achieve efficiency tuning for one operating frequency band, thus limiting the efficiency improvement of the multi-frequency antenna.

[0005] Summary of the Invention

[0006] The present application provides an antenna and an electronic device that can improve the radiation efficiency of a multi-frequency antenna in two operating frequency bands.

[0007] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0008] In a first aspect, an antenna is provided, comprising a main antenna and a parasitic branch. The main antenna has a first operating frequency band and a second operating frequency band, wherein the second operating frequency band is higher than the first operating frequency band, that is, the minimum frequency of the second operating frequency band is higher than the maximum frequency of the first operating frequency band.

[0009] The parasitic branches have a capacitive coupling effect with the radiating branches of the main antenna.

[0010] The parasitic branch includes a first branch segment and a second branch segment arranged at intervals, and a filter device is connected between the first branch segment and the second branch segment. The filter device is in an on 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.

[0011] 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.

[0012] The second frequency interval includes the second operating frequency band, that is, the minimum frequency of the second frequency interval is less than or equal to the minimum frequency of the second operating frequency band, and the maximum frequency of the second frequency interval is greater than or equal to the maximum frequency of the second operating frequency band.

[0013] When the filter device is in an on state, the first branch segment, the second branch segment, and the filter device form a first integral body. The first integral body is capacitively coupled to the radiating branch of the main antenna, generating a first parasitic resonance within a first frequency range. When the filter device is in a blocked state, the first branch segment is capacitively coupled to the radiating branch of the main antenna, generating a second parasitic resonance within a second frequency range.

[0014] 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.

[0015] Similarly, within the second operating frequency band, the filter device is in a blocked state, the first branch segment and the second branch segment are independent of each other, and the antenna radiates energy not only from the main antenna's radiating branches but also from the first branch segment, thereby improving the antenna's system efficiency. Therefore, the antenna provided in this application can simultaneously improve the system efficiency of the main antenna in both operating frequency bands.

[0016] Optionally, 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. In this way, within the first operating frequency band, the energy of the parasitic spur radiation is relatively large, which can improve the system efficiency of the antenna.

[0017] Optionally, the difference between the minimum frequency of the first operating frequency band and f1 is 0.1 GHz, and the difference between f2 and the maximum frequency of the first operating frequency band is 0.5 GHz. In this way, within the first operating frequency band, the energy radiated by the parasitic spurs is greater, which can further improve the system efficiency of the antenna.

[0018] 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, within the second operating frequency band, the energy of the parasitic spur radiation is greater, which can improve the system efficiency of the antenna.

[0019] Optionally, the difference between the minimum frequency of the second operating frequency band and f3 is equal to 0.5 GHz, and the difference between f4 and the maximum frequency of the second operating frequency band is equal to 0.5 GHz. In this way, within the second operating frequency band, the energy radiated by the parasitic spurs is greater, which can further improve the system efficiency of the antenna.

[0020] 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 located between the first end and the first grounding point is the second sub-branch segment. When the filter device is in the on 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 the 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. This structure is simple and the layout is reasonable.

[0021] 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.

[0022] 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 located 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. Wherein, M and N are 0 or positive integers. This structure is simple and the layout is reasonable.

[0023] 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 low in cost.

[0024] 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 parallel.

[0025] Optionally, the radiating branch of the main antenna includes 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 own length direction, and 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 working frequency band, the main radiating branch segment resonates. In the second working 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 working frequency bands, which can save space.

[0026] 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 generate strong capacitive coupling. The parasitic resonance efficiency generated by the first whole is 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.

[0027] 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 operating frequency band. In this way, within the first operating frequency band and the second operating 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.

[0028] 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.

[0029] In a second aspect, an antenna is provided, comprising a main antenna and a parasitic branch. The main antenna has a first operating frequency band and a second operating frequency band, wherein the second operating frequency band is higher than the first operating frequency band, that is, the minimum frequency of the second operating frequency band is higher than the maximum frequency of the first operating frequency band.

[0030] The parasitic branches have a capacitive coupling effect with the radiating branches of the main antenna.

[0031] The parasitic branch includes a first branch segment and a second branch segment arranged at intervals, 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.

[0032] The first frequency interval includes a first operating frequency band, and the second frequency interval includes a second operating frequency band.

[0033] 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.

[0034] 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.

[0035] Similarly, within the second operating frequency band, the filter device is in the on state. In addition to utilizing the branch radiation energy of the main antenna, the antenna also utilizes the first overall radiation energy, thereby improving the antenna's system efficiency. Therefore, the antenna provided in this application can simultaneously improve the system efficiency of the main antenna in both operating frequency bands.

[0036] Optionally, 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. In this way, within the first operating frequency band, the energy of the parasitic spur radiation is relatively large, which can improve the system efficiency of the antenna.

[0037] Optionally, the difference between the minimum frequency of the first operating frequency band and f1 is 0.1 GHz, and the difference between f2 and the maximum frequency of the first operating frequency band is 0.5 GHz. In this way, within the first operating frequency band, the energy radiated by the parasitic spurs is greater, which can further improve the system efficiency of the antenna.

[0038] 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, within the second operating frequency band, the energy of the parasitic spur radiation is greater, which can improve the system efficiency of the antenna.

[0039] Optionally, the difference between the minimum frequency of the second operating frequency band and f3 is equal to 0.5 GHz, and the difference between f4 and the maximum frequency of the second operating frequency band is equal to 0.5 GHz. In this way, within the second operating frequency band, the energy radiated by the parasitic spurs is greater, which can further improve the system efficiency of the antenna.

[0040] 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, 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 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 parasitic branch with a wavelength of (1 / 4+N / 2). 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 parasitic branch with a wavelength of (1 / 4+M / 2). Wherein, M and N are 0 or positive integers. This structure is simple and the layout is reasonable.

[0041] 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 parasitic branch with a wavelength of (1 / 4+N / 2). 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 parasitic branch with a wavelength of (1 / 2+M / 2). Wherein, M and N are 0 or positive integers. This structure is simple and the layout is reasonable.

[0042] 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 parasitic branch with a wavelength of (1 / 2+N / 2). 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 parasitic branch with a wavelength of (1 / 4+M / 2). Wherein, M and N are 0 or positive integers. This structure is simple and the layout is reasonable.

[0043] 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 low in cost.

[0044] 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.

[0045] Optionally, the radiating branch of the main antenna includes 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 own 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. The parasitic branch segment has a fourth grounding point. In the first working frequency band, the main radiating branch segment generates resonance. In the second working 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.

[0046] 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. 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 band, the electric field point is located in the parasitic branch segment, and / or 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. 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.

[0047] 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 operating frequency band. In this way, within the first operating frequency band, the electrical length of the first branch segment is short and cannot be excited to generate reverse current, thereby reducing the impact on the radiation efficiency of the main antenna.

[0048] In a third aspect, an electronic device is 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.

[0049] Since the electronic device provided in the present application includes the antenna described in any of the above technical solutions, both can solve the same problem and produce the same effect.

[0050] In a fourth aspect, an electronic device is also provided, which includes a housing, a main antenna and a parasitic branch.

[0051] The housing includes a first housing, a second housing, and a hinge mechanism. The hinge mechanism is connected between the first and second housings to rotate the housings between a folded state and an unfolded state. When the housings are in the folded state, the first and second housings are stacked. When the housings are in the unfolded state, the first and second housings are arranged side by side.

[0052] The radiation branch of the main antenna is 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.

[0053] The parasitic branch is arranged on the second shell. When the shell is in a folded state, the parasitic branch and the radiation branch of the main antenna have a capacitive coupling effect.

[0054] Among them, the parasitic branch includes a first branch segment and a second branch segment arranged at intervals, and a filter device is connected between the first branch segment and the second branch segment. The filter device is in a conductive state at least when the frequency of the signal entering the filter device is in a first frequency range, and is in a blocked state when the frequency of the signal entering the filter device is in a second frequency range.

[0055] 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.

[0056] The second frequency interval includes the second operating frequency band, that is, the minimum frequency of the second frequency interval is less than or equal to the minimum frequency of the second operating frequency band, and the maximum frequency of the second frequency interval is greater than or equal to the maximum frequency of the second operating frequency band.

[0057] When the filter device is in an on state, the first branch segment, the second branch segment, and the filter device form a first integral body. The first integral body is capacitively coupled to the radiating branch of the main antenna, generating a first parasitic resonance within a first frequency range. When the filter device is in a blocked state, the first branch segment is capacitively coupled to the radiating branch of the main antenna, generating a second parasitic resonance within a second frequency range.

[0058] In this way, when the shell is in the folded state, within the first working 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. 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.

[0059] Similarly, within the second operating 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, in addition to radiating energy from the radiation branch of the main antenna, also radiates energy from the first branch segment, which can also 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. Therefore, the electronic device provided in this 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.

[0060] In a fifth aspect, an electronic device is also provided, which includes a housing, a main antenna and a parasitic branch.

[0061] The housing includes a first housing, a second housing, and a hinge mechanism. The hinge mechanism is connected between the first and second housings to rotate the housings between a folded state and an unfolded state. When the housings are in the folded state, the first and second housings are stacked. When the housings are in the unfolded state, the first and second housings are arranged side by side.

[0062] The radiation branch of the main antenna is 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.

[0063] The parasitic branch is arranged on the second shell. When the shell is in a folded state, the parasitic branch and the radiation branch of the main antenna have a capacitive coupling effect.

[0064] Among them, the parasitic branch includes a first branch segment and a second branch segment arranged at intervals, 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.

[0065] The first frequency interval includes a first operating frequency band, and the second frequency interval includes a second operating frequency band.

[0066] 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.

[0067] In this way, when the shell is in the 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.

[0068] Similarly, in the second operating frequency band, the filter device is in the on state. In addition to the radiation energy of the main antenna's branches, the antenna also uses the first overall radiation energy to compensate to a certain extent for the reduction in the 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.

[0069] 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 working frequency bands, thereby improving the system efficiency of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] FIG1 is a top view of an electronic device in an unfolded state provided by some embodiments of the present application;

[0071] FIG2 is a perspective view of the electronic device shown in FIG1 in a folded state;

[0072] FIG3 is a perspective view of an electronic device in a folded state provided by some other embodiments of the present application;

[0073] FIG4 is a front view of the electronic device shown in FIG3 ;

[0074] FIG5 is a front view of an electronic device in an unfolded state provided by some other embodiments of the present application;

[0075] FIG6 is a front view of the electronic device shown in FIG5 in a folded state;

[0076] FIG7 is a front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0077] FIG8 is a graph showing changes in radiation efficiency and system efficiency with frequency for the antenna in the unfolded state shown in FIG5 , the antenna in the folded state shown in FIG6 , and the antenna in the folded state shown in FIG7 ;

[0078] FIG9 is a front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0079] FIG10 is a schematic diagram of the structure of a parasitic branch in the electronic device shown in FIG9;

[0080] FIG11 is a schematic structural diagram of a filter device provided in some embodiments of the present application;

[0081] FIG12 is a schematic structural diagram of a filter device provided in some other embodiments of the present application;

[0082] FIG13 is a schematic structural diagram of a filter device provided in some embodiments of the present application;

[0083] FIG14 is a circuit diagram corresponding to the filter device shown in FIG13;

[0084] FIG15 is a schematic structural diagram of a filter device provided in some other embodiments of the present application;

[0085] FIG16 is a circuit diagram corresponding to the filter device shown in FIG15 ;

[0086] FIG17 is a front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0087] FIG18 is a graph showing the change in input return loss versus frequency for the antenna in the electronic device shown in FIG17 when the physical lengths of the parasitic stub are 12.75 mm, 13.75 mm, 14.75 mm, and 16.75 mm, respectively, and when there is no parasitic stub;

[0088] FIG19 is a graph showing changes in radiation efficiency versus frequency for the antenna in the electronic device shown in FIG17 when the physical lengths of the parasitic stub are 12.75 mm, 13.75 mm, 14.75 mm, and 16.75 mm, respectively, and when there is no parasitic stub;

[0089] FIG20 is a diagram showing the electric field distribution of the antenna in the electronic device shown in FIG17 at frequencies of 2.5 GHz, 2.96 GHz, and 3.2 GHz, respectively, when the physical length of the parasitic branch is 13.75 mm;

[0090] FIG21 is a graph showing changes in radiation efficiency versus frequency in the second operating frequency band of the antenna in the electronic device shown in FIG17 when the physical lengths of the parasitic stub are 12.75 mm, 13.75 mm, 14.75 mm, and 16.75 mm, respectively, and when there is no parasitic stub;

[0091] FIG22 is a front view of an electronic device in a folded state provided by some other embodiments of the present application;

[0092] FIG23 is a graph showing changes in input return loss versus frequency when the physical lengths of the first branch section of the antenna in the electronic device shown in FIG22 are 10.75 mm, 12.75 mm, and 14.75 mm, respectively, and when there are no parasitic branches;

[0093] FIG24 is a graph showing changes in radiation efficiency versus frequency for the antenna in the electronic device shown in FIG22 when the physical lengths of the first branch segment are 10.75 mm, 12.75 mm, and 14.75 mm, respectively, and when there are no parasitic branches;

[0094] FIG25 is a diagram showing the electric field distribution at frequencies 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 shown in FIG22 is 12.75 mm;

[0095] FIG26 is a graph showing how the radiation efficiency of the antenna in the electronic device shown in FIG22 changes with frequency in the first operating frequency band when the physical lengths of the first branch segment are 10.75 mm, 12.75 mm, and 14.75 mm, respectively, and when there are no parasitic branches;

[0096] FIG27 is a graph showing changes in input return loss, radiation efficiency, and system efficiency of the antenna in the electronic device shown in FIG9 as a function of frequency;

[0097] FIG28 is a diagram showing the electric field distribution of the antenna in the electronic device shown in FIG9 at frequencies of 2.4 GHz, 2.62 GHz, 5.36 GHz, and 5.62 GHz;

[0098] FIG29 is a graph showing changes in radiation efficiency and system efficiency with frequency for the antenna in the folded state of the electronic device shown in FIG9 , the internal antenna of the electronic device shown in FIG9 when in the unfolded state, and the antenna in the folded state of the electronic device shown in FIG7 ;

[0099] FIG30 is a graph showing changes in system efficiency over frequency for the antenna in the folded state of the electronic device shown in FIG9 , the internal antenna of the electronic device shown in FIG9 when in the unfolded state, and the antenna in the folded state of the electronic device shown in FIG7 ;

[0100] FIG31 is a graph showing changes in radiation efficiency and system efficiency versus frequency for the antenna in the folded state shown in FIG9 , the antenna in the folded state shown in FIG17 , and the antenna in the folded state shown in FIG22 ;

[0101] FIG32 is a front view of an electronic device in a folded state provided by yet other embodiments of the present application;

[0102] FIG33 is a schematic diagram of the structure of a parasitic branch in the electronic device shown in FIG32;

[0103] FIG34 is a front view of an electronic device in a folded state provided by yet other embodiments of the present application;

[0104] FIG35 is a schematic diagram of the structure of a parasitic branch in the electronic device shown in FIG34;

[0105] FIG36 is a front view of an electronic device in a folded state provided by yet other embodiments of the present application;

[0106] FIG37 is a front view of an electronic device in a folded state provided by yet other embodiments of the present application;

[0107] FIG38 is a schematic diagram of the structure of a parasitic branch in the electronic device shown in FIG37;

[0108] FIG39 is a front view of an electronic device in a folded state provided by yet other embodiments of the present application;

[0109] FIG40 is a schematic diagram of the structure of a parasitic branch in the electronic device shown in FIG39;

[0110] FIG41 is a front view of an electronic device in a folded state provided by yet other embodiments of the present application;

[0111] FIG42 is a schematic diagram of the structure of a parasitic branch in the electronic device shown in FIG41;

[0112] FIG43 is a front view of an electronic device in a folded state provided by yet other embodiments of the present application;

[0113] FIG44 is a perspective view of electronic devices provided in some other embodiments of the present application;

[0114] FIG45 is a schematic structural diagram of the electronic device shown in FIG44 when viewed from direction D. ... DETAILED DESCRIPTION

[0115] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0116] In the embodiments of the present application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0117] In the embodiments of this application, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0118] It should be noted that, in this embodiment, unless otherwise specified, description of the length of a component refers to the physical length of the component.

[0119] This application provides an electronic device, which is a type of electronic device with communication capabilities. Specifically, the electronic device includes but is not limited to a mobile phone, a tablet computer, a laptop computer, and a smart screen. The embodiments of this application are illustrative of the electronic device as a foldable screen device, which can specifically be a foldable screen mobile phone.

[0120] Please refer to Figures 1 and 2. Figure 1 is a top view of the electronic device 100 provided in some embodiments of the present application in an unfolded state, and Figure 2 is a three-dimensional view of the electronic device 100 shown in Figure 1 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 various 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 is not specifically limited 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.

[0121] The electronic device 100 includes a foldable screen 10 and a housing 20 .

[0122] The foldable screen 10 is used to display images, videos and other information. The housing 20 is located on the back side of the foldable screen 10 and is used to support the foldable screen 10. The back side of the foldable screen 10 refers to the side facing away from the display surface.

[0123] The housing 20 includes a first housing 201 , a second housing 202 and a rotating shaft mechanism 203 .

[0124] The first housing 201 is used to support a portion of the foldable screen 10, and the second housing 202 is used to support another portion of the foldable screen 10. The hinge mechanism 203 is connected between the first housing 201 and the second housing 202, and is used to achieve relative rotation between the first housing 201 and the second housing 202 to support the foldable 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, enabling a large screen display.

[0125] The first housing 201 can be rotated relative to the second housing 202 from the unfolded state shown in FIG1 toward the screen 10 (i.e., folded outward) to fold into a folded state, or it can be rotated relative to the second housing 202 toward the screen 10 (i.e., folded inward) to fold into a folded state. FIG2 illustrates an example of the first housing 201 folding inward relative to the second housing 202 to the folded state, which is not to be considered a special limitation of the present application. When the electronic device is in the folded state, please refer to FIG2 . The housing 20 is in the 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.

[0126] Both the first shell 201 and the second shell 202 have a frame. To facilitate the description of the following embodiments, 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.

[0127] 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 (acrylonitrile butadiene styrene plastic), etc.

[0128] In some embodiments, the first frame A and the second frame B may comprise a non-metallic material and a metal conductor embedded within the non-metallic material. This ensures the appearance of the first frame A and the second frame B is consistent with the non-metallic material, while the metal conductor can be used to construct the antenna's radiating branches, enabling transmission and reception of radio frequency signals. Furthermore, the metal conductor can increase the structural strength of the first frame A and the second frame B, improving their impact resistance.

[0129] Continuing to refer to FIG1 and FIG2 , the electronic device 100 further 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 navigation functions, 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 Bluetooth functions. The cellular antenna can be used to implement call functions. The cellular antenna can cover 2G, 3G, 4G, 5G, long term evolution (LTE) frequency bands, citizen broadband radio service (CBRS) frequency bands, and 5G new radio (NR) frequency bands.

[0130] The antenna 30 may include a main antenna 1. The main antenna 1 may be disposed in the first shell 201. Specifically, the radiating branches of the main antenna 1 may be formed by the metal conductor of the first frame A. In other embodiments, when the material of the first frame A is non-metallic, the radiating branches of the main antenna 1 may be disposed on the inner side of the first frame A, where the inner side of the first frame A refers to the side of the first frame A facing the interior space of the first shell 201. In still other embodiments, when the material of the first frame A is metal, the radiating branches of the main antenna 1 may also be formed by the first frame A through a slit.

[0131] In some scenarios, the radiation efficiency of antenna 30 is low. For example, when electronic device 100 is in the folded state shown in Figure 2, it is blocked by second frame B and part of the screen carried by second housing 202, which deteriorates the radiation environment of main antenna 1. Reverse cancellation current is generated in second frame B, causing the efficiency of main antenna 1 to drop sharply and the communication performance of antenna 30 to degrade.

[0132] In order to improve the radiation efficiency of the antenna 30, parasitic branches may be added to achieve efficiency tuning.

[0133] For example, please refer to FIG3 , which is a perspective view of an electronic device 100 in a folded state according to some embodiments of the present application. In this embodiment, the antenna 30 includes not only the main antenna 1 but also a parasitic branch 2 .

[0134] The parasitic branch 2 can be formed by the metal conductor structure of the second frame B. In other embodiments, when the material of the second frame B is non-metallic, the parasitic branch 2 can be arranged on the inner side of the second frame B, where the inner side of the second frame B refers to the side of the second frame B facing the interior space of the second shell 202. In still other embodiments, when the material of the second frame B is metal, the parasitic branch 2 can also be formed by a crack in the second frame B.

[0135] When the electronic device 100 is in the 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.

[0136] Parasitic branch 2 is capacitively coupled with the radiating branch of main antenna 1 to produce a parasitic resonance, the center frequency of which can be within or near the operating frequency band of main antenna 1. Thus, within the operating frequency band of main antenna 1, antenna 30 radiates energy not only from the radiating branches of main antenna 1 but also from parasitic branch 2. This can, to a certain extent, compensate for the reduction in radiation efficiency of main antenna 1 caused by the folding screen on second bezel B and second housing 202, thereby improving the radiation efficiency of antenna 30.

[0137] 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 the working frequency band of the GPS antenna and the working frequency band of the Wi-Fi antenna, or 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.

[0138] To meet the above requirements, for example, please refer to Figure 4, which is a front view of the electronic device 100 shown in Figure 3. In this embodiment, the radiation branches of the main antenna 1 include main radiation branch segments 11 and parasitic branch segments 12 that are spaced apart.

[0139] The main radiation branch segment 11 has a feeding point P01 and a third grounding point P02 spaced apart along its length.

[0140] The feeding point P01 is coupled to the RF front end via a feeding element, wherein the RF front end may be disposed on a circuit board in the interior space of the first housing, and the feeding element includes but is not limited to a spring, a coaxial line, and a microstrip line.

[0141] The third ground point P02 is coupled to a reference ground via a grounding element. The reference ground can be a metal plate within the electronic device, such as a midplane, or a metal reference ground layer within a circuit board. Grounding elements include, but are not limited to, conductive blocks, conductive wires, and printed circuit boards.

[0142] 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 radiating branch segment 11 coupled to the RF front end, and the third grounding point P02 refers to the position on the main radiating branch segment 11 coupled to the reference ground.

[0143] 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 physical contact and electrical conduction between components, or can be understood as a form of connection between different components in a circuit structure through physical lines such as printed circuit board copper foil or wires that can transmit electrical signals. “Indirect coupling” can be understood as electrical conduction between two conductors in an air-spaced 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.

[0144] The main radiation branch segment 11 further has a third end D3 , which is located on a side of the feeding point P01 away from the third grounding point P02 and spaced apart from the feeding point P01 .

[0145] Based on this, the parasitic branch segment 12 is located on a side of the third end D3 away from the feeding point P01 .

[0146] The parasitic stub segment 12 may have a fourth grounding point P03, which is coupled to the reference ground via a grounding member. Similarly, the fourth grounding point P03 is not a real point, but refers to a location on the parasitic stub segment 12 coupled to the reference ground.

[0147] When the RF front end feeds an RF signal to feed point P01, it can excite the left-handed mode of the main radiating branch segment 11, the monopole mode from feed point P01 to third end D3, the parasitic mode of the parasitic branch segment 12, and the toroidal mode from feed point P01 to fourth ground point P03, depending on the frequency of the RF signal. Therefore, the main antenna 1 operates in at least four frequency bands.

[0148] Based on this, please continue to refer to FIG. 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 operating frequency band of the main antenna 1 .

[0149] Based on this, in order to achieve efficiency tuning in multiple operating frequency bands, multiple lumped parameter elements and selection switches can be set on the ground line of the parasitic branch 2. The lumped parameter elements include but are not limited to capacitors, inductors, or circuits formed by connecting one or both of them in parallel, in series, or in series-parallel.

[0150] By selecting switches and connecting different lumped-parameter components in series to the ground line, the electrical length of parasitic stub 2 can be adjusted, thereby adjusting the resonant center frequency of parasitic stub 2 to within or near different operating frequency bands, thereby improving radiation efficiency in multiple operating frequency bands. However, this increases costs and requires high precision in the selection and electrical connection of lumped-parameter components, making implementation difficult.

[0151] In order to reduce costs and implementation difficulty, in some other embodiments, please refer to Figures 5 and 6. Figure 5 is a main view of the electronic device 100 provided in some other embodiments of the present application when it is in an unfolded state, and Figure 6 is a main view of the electronic device 100 shown in Figure 5 when it is in a folded state. In this embodiment, the number of parasitic branches 2 is two, namely the first parasitic branch 2a and the 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 the left-hand mode) of the main radiation branch segment 11. 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.

[0152] However, the parasitic branches that improve efficiency in the lower operating frequency band are relatively long, blocking the main antenna 1 in the higher operating frequency band, resulting in lower efficiency of antenna 30 in the higher operating frequency band. However, the parasitic branches that improve efficiency in the higher operating frequency band are relatively short, and do not block the main antenna 1 in the lower operating frequency band. Therefore, it is still impossible to simultaneously improve more than two operating frequency bands.

[0153] 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 shell 202, in some other embodiments, please refer to Figure 7, which is a main view of the electronic device 100 provided in some other embodiments of the present application when it is 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 opposite to the radiation branches of the main antenna 1, and the plurality of breaks separate the metal conductor into a plurality of shorter suspended branches n. The length of the suspended branches n is short and cannot be excited to resonate and generate reverse current, so it will not reduce the radiation efficiency of the main antenna 1. However, in the folded state, the folding screen on the second shell still blocks the main antenna 1, resulting in the radiation efficiency of the antenna 30 being still low. Moreover, there are a large number of breaks, and the structural strength of the second frame B is difficult to guarantee.

[0154] Please refer to Figure 8, which is a simulated curve diagram of the radiation efficiency (Rad.Eff) and system efficiency (Tot.Eff) of the antenna 30 in the electronic device 100 in the unfolded state shown in Figure 5, the antenna 30 in the electronic device 100 in the folded state shown in Figure 6, and the antenna 30 in the electronic device 100 in the folded state shown in Figure 7 as a function of frequency.

[0155] Specifically, the antenna 30 inside the electronic device 100 in the unfolded state shown in Figure 5 is represented as "Scheme 1 unfolded state" in Figure 8, and the antenna 30 inside the electronic device 100 in the folded state shown in Figure 6 is represented as "Scheme 1 folded state" in Figure 8. The performance of the internal antenna 30 of the electronic device 100 shown in Figure 7 when in the unfolded state is the same as the performance of the antenna 30 inside the electronic device 100 in the unfolded state shown in Figure 5. The antenna 30 inside the electronic device 100 in the folded state shown in Figure 7 is represented as "Scheme 2 folded state" in Figure 8.

[0156] 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.

[0157] Table 1

[0158] It can be seen from Figure 8 and Table 1 that the system efficiency of the antennas shown in Scheme 1 and Scheme 2 when the electronic device 100 is in the folded state is 0.3dB-3.5dB lower than the system efficiency in the 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.

[0159] Based on this, in order to improve the radiation efficiency of the antenna 30 in the two operating frequency bands, please refer to Figure 9, which is a front view of the electronic device 100 in a folded state provided in some embodiments of the present application. The electronic device 100 includes an antenna 30, which includes a main antenna 1. The main antenna 1 is disposed in the first housing 201. Specifically, the main antenna 1 can be disposed in the first middle frame A of the first housing 201. In other embodiments, the main antenna 1 can also be disposed inside the first middle frame A.

[0160] The main antenna 1 is a multi-frequency antenna including at least two operating frequency bands.

[0161] 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.

[0162] The first operating frequency band can be a GPS band, a Wi-Fi 2.4G band, etc., and the second operating frequency band can be an n41 band, a Wi-Fi 5G band, etc. The following embodiments are illustrative of the first operating frequency band being the Wi-Fi 2.4G band and the second operating frequency band being the Wi-Fi 5G band. This is not to be considered a special limitation of this 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.

[0163] In some embodiments, referring to FIG9 , the main antenna 1 can have the same structural form as the main antenna 1 in the electronic device 100 shown in FIG4 to FIG7 . Based on this, optionally, in the first operating frequency band, the main radiating branch segment 11 of the main antenna 1 generates resonance. Specifically, the main radiating branch segment 11 can generate left-hand mode resonance. In the second operating 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.

[0164] 9 , the antenna 30 further includes a parasitic branch 2. The parasitic branch 2 is disposed in the second housing 202, specifically in the second middle frame B of the second housing 202. In other embodiments, the parasitic branch 2 may also be disposed inside the second middle frame B.

[0165] When the electronic device 100 is in the folded state, the parasitic branch 2 has a capacitive coupling effect with the radiation branch of the main antenna 1 .

[0166] The parasitic branch 2 includes a first branch segment 21 and a second branch segment 22 that are spaced apart. A filter element 23 is connected between the first branch segment 21 and the second branch segment 22.

[0167] In some embodiments, please continue to refer to Figure 9, the filter device 23 can be 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 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 of the connection of the filter device 23 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 considered as a special limitation to the present application.

[0168] The filter element 23 is in a conducting state at least when the signal frequency is within a first frequency range, and is in a blocking state when the signal frequency is within a second frequency range.

[0169] The first frequency interval includes the first operating frequency band, that is, the minimum frequency of the first frequency interval is less than or equal to the minimum frequency of the first operating frequency band, and the maximum frequency of the first frequency interval is greater than or equal to the maximum frequency of the first operating frequency band.

[0170] 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.

[0171] 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.

[0172] Similarly, the second frequency interval includes the second operating frequency band, that is, the minimum frequency of the second frequency interval is less than or equal to the minimum frequency of the second operating frequency band, and the maximum frequency of the second frequency interval is greater than or equal to the maximum frequency of the second operating frequency band.

[0173] 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, within the second operating frequency band, the energy of the parasitic spur radiation is greater, which can improve the system efficiency of the antenna.

[0174] Optionally, the difference between the minimum frequency of the second operating frequency band and f3 is equal to 0.5 GHz, and the difference between f4 and the maximum frequency of the second operating frequency band is equal to 0.5 GHz. In this way, within the second operating frequency band, the energy radiated by the parasitic spurs is greater, which can further improve the system efficiency of the antenna.

[0175] In some embodiments, the filter device 23 can be in a conducting state within a larger range including the first frequency range, and in a blocking state within a larger range including the second frequency range. For example, the filter device 23 is in a conducting state when the signal frequency is less than a first preset threshold, and is in a blocking state when the signal frequency is greater than or equal to the first preset threshold. The first preset threshold can be greater than the maximum frequency of the first frequency range and less than the minimum frequency of the second frequency range. In this way, the filter device 23 is a low-pass high-impedance device, which has a simple structure and is easy to implement.

[0176] 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, where 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, where the other frequency intervals include the first frequency interval.

[0177] Based on 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 integral body. The first integral body is capacitively coupled with the radiating branch of the main antenna 1 and generates a first parasitic resonance within a first frequency range. In other words, the resonant center frequency of the first parasitic resonance is within the first frequency range. When the filter device 23 is in the off state, the first branch segment 21 is capacitively coupled with the radiating branch of the main antenna 1 and generates a second parasitic resonance within a second frequency range. In other words, the resonant center frequency of the second parasitic resonance is within the second frequency range.

[0178] In this way, within the first working frequency band, the filter device 23 is in the on state, and the antenna 30 not only uses the radiation branch energy of the main antenna 1, but also uses the first overall radiation energy, thereby compensating 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.

[0179] 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 branch of the main antenna 1, and also radiates energy with the help of the first branch segment 21. It 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.

[0180] 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.

[0181] On the basis of the above embodiments, optionally, when the electronic device 100 is in a folded state, please refer to Figure 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 a 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 a direction perpendicular to the second branch segment 22 overlaps with the second branch segment 22.

[0182] It should be noted that, in this embodiment and the following embodiments, the description of "overlapping" of two objects includes four implementation methods: the entire object overlaps with the entire other object, a portion of one object overlaps with the entire other object, the entire object overlaps with a portion of another object, and a portion of one object overlaps with a portion of another object. The same descriptions in the following text should be understood in the same way.

[0183] Similarly, referring to Figure 9 , the first branch segment 21 includes a first section, a second section, and a third section. The first section is opposite the parasitic branch segment 12 , the second section is opposite a portion of the main radiating branch segment 11 between the feed point P01 and the third end D3 , and the third section is connected between the first and second sections and opposite the gap between the main radiating branch segment 11 and the parasitic branch segment 12 .

[0184] In this way, in the first frequency band, the electric field point 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. 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 current intensity is located at the parasitic branch segment 12, and / or at the 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 the 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. 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.

[0185] 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 . This application does not make any specific limitation on this.

[0186] In some embodiments, referring to Figures 9 and 10 , Figure 10 is a schematic diagram of the structure of a parasitic branch 2 within the electronic device 100 shown in Figure 9 . The second branch segment 22 has a first grounding point P1. The first grounding point P1 is not an actual point; it refers to a location on the second branch segment 22 that is coupled to a reference ground.

[0187] 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 .

[0188] 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 longitudinal direction of the second branch segment 22. This embodiment and the following embodiments are illustrative examples in which the first grounding point P1 is located at the end of the second branch segment 22 away from the first branch segment 21.

[0189] 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. The electrical length of the second whole is greater than or equal to 1 / 4 times the wavelength corresponding to the above-mentioned frequency f2, and less than or equal to 1 / 4 times the wavelength corresponding to the above-mentioned frequency f1. In this way, when the filter device is in the on state, the second whole forms a 1 / 4 wavelength parasitic branch. This structure is simple and the size design is reasonable.

[0190] 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.

[0191] 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.

[0192] Continuing to refer to Figures 9 and 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 above-mentioned frequency f4, and less than or equal to 1 / 2 times the wavelength corresponding to the above-mentioned 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.

[0193] In some embodiments, referring to Figures 9 and 10 , to reduce the impact of the second branch segment 22a on the radiation efficiency of the main antenna 1 within the second operating frequency band, in some embodiments, the electrical length of the second branch segment 22 is less than or equal to 1 / 4 of the wavelength corresponding to the maximum frequency of the second operating frequency band. This shortens the electrical length of the second branch segment 22 within both the first and second operating frequency bands, preventing it from stimulating reverse current, thereby minimizing its impact on the radiation efficiency of the main antenna 1.

[0194] The above embodiments have described the structure of the parasitic stub 2 , and the following focuses on the structure of the filter device 23 .

[0195] The filter device 23 may include a lumped element, which may be an inductor, or a circuit formed by connecting an inductor and a capacitor in parallel, in series, or in series-parallel connection.

[0196] In some embodiments, please refer to Figure 11, which is a schematic structural diagram of a filter device 23 provided in some embodiments of the present application. Specifically, Figure 11 (a) is a top view of the filter device 23, and Figure 11 (b) is a front view of the filter device 23. The filter device 23 may also include a printed circuit board (PCB) 231. The lumped element may be disposed on the PCB 231. The filter device 23 is connected between the first branch segment 21 and the second branch segment 22 via the PCB 231. This structure is simple and modular, making it easy to produce and install.

[0197] 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 and parallel.

[0198] For example, please refer to Figure 12, which is a structural schematic diagram of the filter device 23 provided in some other embodiments of the present application. Specifically, (a) in Figure 12 is a three-dimensional view of the filter device 23, and (b) in Figure 12 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 can be integrally formed with the first branch segment 21 and the second branch segment 22. In other embodiments, the metal insert 232 can 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-metallic 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.

[0199] In this way, the filter element 23 is in the form of an MDA structure, which is simple in structure and easy to form.

[0200] For another example, please refer to Figure 13, which is a schematic diagram of the structure of the 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 above-mentioned first branch segment 21 and the second branch segment 22, respectively, and the middle width 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 facing away from 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 , which is a circuit diagram corresponding to the filter device 23 shown in FIG. 13 .

[0201] For another example, please refer to Figure 15, which is a schematic diagram of the structure of a filter device 23 provided in some other embodiments of the present application. The filter device 23 includes a metal layer, which 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 , which is a circuit diagram corresponding to the filter device 23 shown in FIG. 15 .

[0202] In the embodiments shown in Figures 13 and 15 , the filter element 23 can be a flexible printed circuit (FPC) board structure, 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.

[0203] To verify the effect of the antenna 30 provided in the embodiment of the present application, please refer to Figure 17, which is a front view of the electronic device 100 provided in some other embodiments of the present application when it is in a folded state. In this embodiment, in the antenna 30, the first operating frequency band of the main antenna 1 is the Wi-Fi 2.4G band, and the specific frequency range is 2.4GHz-2.5GHz. Based on this, the above-mentioned first frequency range is [2.3GHz, 3GHz]. Parasitic branch 2 is the above-mentioned second whole, and parasitic branch 2 is a parasitic branch of 1 / 4 wavelength.

[0204] Please refer to Figure 18, which shows a graph of the input return loss (S11) versus frequency for antenna 30 in electronic device 100 shown in Figure 17 when the physical length of parasitic stub 2 is 12.75mm, 13.75mm, 14.75mm, and 16.75mm, respectively, and when there is no parasitic stub 2. As shown in Figure 18, within the 1GHz-4GHz frequency range, without parasitic stub 2, there is a single resonant wave generated by main antenna 1. This resonant wave is generated by main antenna 1. With parasitic stub 2, there are two resonant waves: one resonant wave is generated by main antenna 1, indicated as the main mode in Figure 18, and the other resonant wave is generated by parasitic stub 2.

[0205] 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).

[0206] 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 lower frequency.

[0207] Please refer to Figure 19 and Table 2 below. Figure 19 is a curve diagram of the radiation efficiency of the antenna 30 in the electronic device 100 shown in Figure 17 when the physical length of the parasitic branch 2 is 12.75 mm, 13.75 mm, 14.75 mm, 16.75 mm, and there is no parasitic branch 2. Table 2 records the average radiation efficiency of the antenna 30 in the electronic device 100 shown in Figure 17 in the first working frequency band (that is, the Wi-Fi 2.4G band) when the physical length of the parasitic branch 2 is 12.75 mm, 13.75 mm, 14.75 mm, 16.75 mm, and there is no parasitic branch 2.

[0208] Table 2

[0209] As shown in Figure 19 and Table 2, as the physical length of parasitic stub 2 increases, the radiation efficiency of antenna 30 in the first operating frequency band gradually increases. When the center frequency of the resonant wave generated by parasitic stub 2 falls below the minimum frequency of the first frequency range, the efficiency dip shifts to the first operating frequency band, and the performance of antenna 30 deteriorates. In the first frequency range [2.3 GHz, 3 GHz], adding parasitic stub 2 improves the radiation performance of antenna 30 in the first operating frequency band by approximately 1.3 dB.

[0210] Please refer to Figure 20, which shows the electric field distribution diagrams of antenna 30 in electronic device 100 shown in Figure 17 at frequencies of 2.5 GHz, 2.96 GHz, and 3.2 GHz, respectively, when the physical length of parasitic stub 2 is 13.75 mm. Specifically, Figure 20 (a) shows the electric field distribution diagram of antenna 30 at 2.5 GHz, Figure 20 (b) shows the electric field distribution diagram of antenna 30 at 2.96 GHz, and Figure 20 (c) shows the electric field distribution diagram of antenna 30 at 3.2 GHz.

[0211] As shown in Figure 20(a), at 2.5 GHz, the left-hand mode of the main radiating branch segment 11 occurs, and the current in parasitic branch 2 and the current in the main radiating branch segment 11 are distributed in the same direction. While the antenna 30 transmits or receives signals via the main radiating branch segment 11, it also transmits or receives signals via parasitic branch 2, thereby improving the radiation efficiency of the antenna 30. As shown in Figure 20(b), at 2.96 GHz, the parasitic mode of parasitic branch 2 occurs, and the current in the main radiating branch segment 11 and the current in parasitic branch 2 are distributed in opposite directions. As shown in Figure 20(c), at 3.2 GHz, the current in the main radiating branch segment 11 and the current in parasitic branch 2 are distributed with equal amplitude and in opposite directions, presenting an efficiency pit.

[0212] Please refer to Figure 21, which shows a graph of the radiation efficiency of antenna 30 in the second operating frequency band of the electronic device 100 shown in Figure 17, when the physical length of the parasitic branch 2 is 12.75mm, 13.75mm, 14.75mm, and 16.75mm, respectively, and when there is no parasitic branch 2. The second operating frequency band is the Wi-Fi 5G band, with a frequency range of 5.15GHz-5.85GHz. As shown in Figure 21, as the physical length of the parasitic branch 2 increases, the antenna efficiency of antenna 30 in the second operating frequency band gradually decreases. This is because the parasitic branch 2 blocks the radiation environment of the main antenna 1.

[0213] Please refer to Figure 22, which is a front view of the electronic device 100 provided in some other embodiments of the present application when in a folded state. In this embodiment, in the antenna 30, the second operating frequency band of the main antenna 1 is the Wi-Fi 5G 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 set at intervals, and the first branch segment 21 is suspended.

[0214] Please refer to Figure 23, which shows the input return loss (S11) versus frequency for antenna 30 in electronic device 100 shown in Figure 22 when the physical length of first branch segment 21 is 10.75mm, 12.75mm, and 14.75mm, respectively, and when no parasitic branch segment 2 is present. As shown in Figure 23, within the 4GHz-7GHz frequency band, a new resonant wave is generated by first branch segment 21, compared to when no parasitic branch segment 2 is present. The resonant mode of main antenna 1 is still marked as the main mode in Figure 23.

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

[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 lower frequency, thereby widening the operating bandwidth of the antenna 30 .

[0217] Please refer to Figure 24 and Table 3 below. Figure 24 is a curve diagram of the radiation efficiency changing with frequency when the physical length of the first branch segment 21 of the antenna 30 in the electronic device 100 shown in Figure 22 is 10.75 mm, 12.75 mm, 14.75 mm, and there is no parasitic branch 2. Table 3 records the average radiation efficiency of the antenna 30 in the electronic device 100 shown in Figure 22 in the second operating frequency band (that is, the Wi-Fi 5G band) when the physical length of the first branch segment 21 is 10.75 mm, 12.75 mm, 14.75 mm, and there is no parasitic branch 2.

[0218] Table 3

[0219] As shown in Figure 24 and Table 3, as the physical length of first branch segment 21 increases, the average radiation efficiency of antenna 30 in the second operating frequency band gradually decreases. When the physical length of first branch segment 21 is too long, the efficiency dip shifts to the second operating frequency band, significantly deteriorating the performance of antenna 30. In the second frequency range [4.65 GHz, 6.35 GHz], the addition of the parasitic branch 2 improves the radiation performance of antenna 30 in the second operating frequency band by approximately 0.2 dB.

[0220] Please refer to Figure 25, which shows the electric field distribution diagrams of the antenna 30 in the electronic device 100 shown in Figure 22 at frequencies of 5.12 GHz, 5.45 GHz, and 5.8 GHz, respectively, when the physical length of the first branch segment 21 is 12.75 mm. Specifically, Figure 25(a) shows the electric field distribution diagram of the antenna 30 at a frequency of 5.12 GHz, Figure 25(b) shows the electric field distribution diagram of the antenna 30 at a frequency of 5.45 GHz, and Figure 25(c) shows the electric field distribution diagram of the antenna 30 at a frequency of 5.8 GHz.

[0221] As shown in Figure 25 (a), at the 5.12 GHz frequency, the parasitic mode with half the wavelength of the first branch segment 21 is dominant. The current direction of the main antenna 1 is the same as that of the first branch segment 21. While antenna 30 transmits or receives signals via the main antenna 1, it also transmits or receives signals via the first branch segment 21, thereby improving the radiation efficiency of antenna 30. As shown in Figure 25 (b) and (c), at the 5.45 GHz and 5.8 GHz frequencies, the electric field peaks of the main antenna 1 and the first branch segment 21 occur at different phases, minimizing mutual influence.

[0222] Please refer to Figure 26, which is a graph showing the variation of the radiation efficiency of the first operating frequency band of the antenna 30 in the electronic device 100 shown in Figure 22 with frequency when the physical length of the first branch segment 21 is 10.75mm, 12.75mm, 14.75mm, and when there is no parasitic branch 2. The first operating frequency band is the Wi-Fi 2.4G band, and the frequency range is 2.4GHz-2.5GHz. As can be seen from Figure 26, since the electrical length of the first branch segment 21 is much less than 1 / 2 times the wavelength corresponding to 2.5GHz, it is impossible to generate a corresponding parasitic mode in the first operating frequency band, and therefore there is no significant improvement in the performance of the antenna 30 in the first operating frequency band.

[0223] Please refer to Figure 27, which is a graph showing the input return loss (S11), radiation efficiency, and system efficiency of antenna 30 in electronic device 100 shown in Figure 9 as a function of frequency. As shown in Figure 27, by providing filtering device 23, parasitic branch 2 can generate parasitic resonance in the first operating frequency band (e.g., the Wi-Fi 2.4G band) and the second operating frequency band (e.g., the Wi-Fi 5G band), thereby improving the radiation performance of antenna 30 when electronic device 100 is in the folded form.

[0224] Please refer to Figure 28, which shows the electric field distribution diagram of antenna 30 in electronic device 100 shown in Figure 9 at 2.4 GHz, 2.62 GHz, 5.36 GHz, and 5.62 GHz. Specifically, Figure 28 (a) shows the electric field distribution diagram of antenna 30 at 2.4 GHz, Figure 28 (b) shows the electric field distribution diagram of antenna 30 at 2.62 GHz, Figure 28 (c) shows the electric field distribution diagram of antenna 30 at 5.36 GHz, and Figure 28 (d) shows the electric field distribution diagram of antenna 30 at 5.62 GHz. In the first operating frequency band, antenna 30 has two modes: a second overall 1 / 4 wavelength parasitic mode at 2.62 GHz, which can improve the antenna efficiency of the main mode. In the second operating frequency band, antenna 30 also has two modes: a first branch segment 1 / 2 wavelength parasitic mode at 5.36 GHz, which can broaden the bandwidth of the second operating frequency band.

[0225] Please refer to Figures 29, 30 and 31. Figure 29 is a graph showing the variation of the radiation efficiency (Rad.Eff) and the system efficiency (Tot.Eff) of the antenna 30 in the folded state of the electronic device 100 shown in Figure 9, the internal antenna 30 of the electronic device 100 shown in Figure 9 when it is in the unfolded state, and the internal antenna 30 of the electronic device 100 shown in Figure 7 as a function of frequency. Figure 30 is a graph showing the variation of the radiation efficiency (Rad.Eff) and the system efficiency (Tot.Eff) of the antenna 30 in the folded state of the electronic device 100 shown in Figure 9, the internal antenna 30 of the electronic device 100 shown in Figure 9 when it is in the unfolded state. FIG31 is a graph showing how the radiation efficiency (Rad.Eff) and the system efficiency (Tot.Eff) of the antenna 30 in the electronic device 100 in the folded state shown in FIG9 , the antenna 30 in the electronic device 100 in the folded state shown in FIG17 , and the antenna 30 in the electronic device 100 in the folded state shown in FIG22 vary with frequency.

[0226] The main antenna 1 of the internal antenna 30 of the electronic device 100 shown in FIG9 is the same as the main antenna 1 of the internal antenna 30 of the electronic device 100 shown in FIG7 , FIG17 and FIG22 . 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, the radiation efficiency of the internal antenna 30 of the electronic device 100 shown in FIG9 when in the unfolded state is roughly the same as that of the internal antenna 30 of the electronic device 100 shown in FIG7 , FIG17 and FIG22 when in the unfolded state. Therefore, FIG29-FIG31 only provides the curves of the change of the radiation efficiency (Rad.Eff) and the system efficiency (Tot.Eff) of the internal antenna 30 of the electronic device 100 shown in FIG9 when in the unfolded state with the frequency (Frequency) for comparison.

[0227] For the convenience of description, the antenna 30 inside the electronic device 100 in the folded state shown in Figure 7 is represented as "Scheme 2 folded state" in Figures 29-31, the antenna 30 inside the electronic device 100 in the folded state shown in Figure 9 is represented as "Scheme 3 folded state" in Figures 29-31, the internal antenna 30 of the electronic device 100 in the unfolded state shown in Figure 9 is represented as "Scheme 3 unfolded state" in Figures 29-31, the antenna 30 inside the electronic device 100 in the folded state shown in Figure 17 is represented as "Scheme 4 folded state" in Figures 29-31, and the antenna 30 inside the electronic device 100 in the folded state shown in Figure 22 is represented as "Scheme 5 folded state" in Figures 29-31.

[0228] 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.

[0229] Table 4

[0230] It can be seen from Figures 29 to 31 and Table 4 that, compared with the antenna 30 in the electronic device 100 shown in Figures 7, 17 and 22, the performance of the antenna 30 in the electronic device 100 shown in Figure 9 in the folded state in the two working frequency bands is smaller than that in the unfolded state, and the specific difference is within 0.6dB. Therefore, it can take into account the performance improvement of the two working frequency bands at the same time and has better performance.

[0231] To sum up, the use of a parasitic branch 2 with a 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 in the folded state of the folding screen device is roughly the same as the radiation performance of the antenna 30 in the unfolded state.

[0232] It should be noted that the above embodiments are exemplified by assuming that the second whole is a 1 / 4 wavelength parasitic branch and the first branch segment 21 is a 1 / 2 wavelength parasitic branch.

[0233] In other embodiments, the second entity may also be a parasitic stub with a wavelength of 3 / 4, 5 / 4, 7 / 4, ... times. In other words, the second entity forms a parasitic stub with a wavelength of (1 / 4 + M / 2), where M is 0 or a positive integer. The electrical length of the second entity 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.

[0234] In other embodiments, the first branch segment 21 may also be a parasitic branch with 1, 3 / 2, 2, 5 / 2, ... times the wavelength. In other words, the first branch segment 21 forms a parasitic branch with (1 / 2 + N / 2) times the wavelength, 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.

[0235] It should be noted that the above embodiment is exemplified by the fact that the end of the second branch segment 22 away from the first branch segment 21 is grounded, and the end of the first branch segment 21 away from the second branch segment 22 is suspended. That is, the boundary condition of the second branch segment 22 is the perfect electric conductor (PEC) boundary condition, and the boundary condition of the first branch segment 21 is the perfect magnetic conductor (PMC) boundary condition.

[0236] In some other embodiments, the boundary conditions of the second branch segment 22 may also be perfect magnetic conductor (PMC) boundary conditions, and the boundary conditions of the first branch segment 21 may also be perfect electric conductor (PEC) boundary conditions. Alternatively, 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. Alternatively, 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.

[0237] For example, please refer to Figures 32 and 33. Figure 32 is a front view of the electronic device 100 in a folded state according to some other embodiments of the present application, and Figure 33 is a schematic diagram of the structure of the parasitic branch 2 within the electronic device 100 shown in Figure 32. In this embodiment, the second branch segment 22 has the first grounding point P1 described above, and 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.

[0238] 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 of the first branch segment 21, the second grounding point P2 is spaced apart from the second end D2.

[0239] 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 illustrative examples in which the second grounding point P2 is located at the end of the first branch segment 21 away from the second branch segment 22.

[0240] The portion of the first branch segment 21 located between the second grounding point P2 and the second end D2 is a first sub-branch segment 21 a .

[0241] 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.

[0242] 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 entity, which forms a ring mode parasitic branch. The electrical length of the third entity 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.

[0243] When the filter device is in the blocking state, the first sub-branch segment 21a forms a parasitic branch with a wavelength of (1 / 4 + N / 2). 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.

[0244] This structure is simple and easy to operate.

[0245] For another example, please refer to Figures 34 and 35. Figure 34 is a front view of the electronic device 100 provided in some embodiments of the present application when in a folded state, and Figure 35 is a structural schematic diagram of the parasitic branch 2 in the electronic device 100 shown in Figure 34. In this embodiment, the second branch segment 22 is suspended, and the first branch segment 21 has the above-mentioned 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 all perfect electric conductor (PEC) boundary conditions.

[0246] 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 entity, which forms a (1 / 4 + M / 2)-times-wavelength parasitic branch. The electrical length of the fourth entity 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.

[0247] When the filter device is in the blocking state, the first sub-branch segment 21a forms a parasitic branch with a wavelength of (1 / 4 + N / 2). 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.

[0248] This structure is simple and easy to operate.

[0249] For further example, please refer to Figure 36, which is a front view of the electronic device 100 in a folded state according to some other 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.

[0250] 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 integral body that is a parasitic branch of (1 / 2+M / 2) times the wavelength. The electrical length of the first integral body 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.

[0251] When the filter device is in the blocking state, the first branch segment 21 forms a parasitic branch with a wavelength of (1 / 2+N / 2). 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.

[0252] This structure is simple and easy to operate.

[0253] In some other embodiments, please refer to Figure 37, which is a main view of the electronic device 100 provided in some other embodiments of the present application when it is in a folded state. 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 the first frequency interval, and is in a conducting state when the signal frequency is in the second frequency interval. Among them, the signal frequency refers to the signal frequency entering the filter device 23. The first frequency interval can be the same as the first frequency interval in any of the aforementioned embodiments, and the first frequency interval can be the same as the second frequency interval in any of the aforementioned embodiments, which will not be repeated here.

[0254] In some embodiments, the filter device 23 can be in a blocking state within a larger range including the first frequency range, and in a conducting state within a larger range including the second frequency range. For example, the filter device 23 is in a blocking state when the signal frequency is less than a second preset threshold, and is in a conducting state when the signal frequency is greater than or equal to the preset threshold. The second preset threshold can be greater than the maximum frequency of the first frequency range and less than the minimum frequency of the second frequency range. In this way, the filter device 23 is a low-impedance, high-pass device, which has a simple structure and is easy to implement.

[0255] 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, wherein 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, wherein the other frequency intervals include the first frequency interval.

[0256] The filter device 23 may include a lumped element, which may be a capacitor, or a circuit formed 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 formed 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.

[0257] Based on the above, when the filter device is in the blocking state, the second branch segment 22 capacitively couples with the radiating branch of the main antenna 1 and generates a third parasitic resonance within the first frequency range. In other words, the resonant center frequency of the third parasitic resonance is within the first frequency range. When the filter device is in the conducting state, the first branch segment 21, the second branch segment 22, and the filter device 23 form a first integral body. This first integral body capacitively couples with the radiating branch of the main antenna 1 and generates a fourth parasitic resonance within the second frequency range. The resonant center frequency of this fourth parasitic resonance is within the second frequency range.

[0258] 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 radiation branch of the main antenna 1, and also radiates energy with the help of the second branch segment 22, thereby compensating 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.

[0259] Similarly, in the second working frequency band, the filter device 23 is in the on state. In addition to the radiation energy of the branch radiation 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.

[0260] In this way, 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.

[0261] In some embodiments, please continue to refer to FIG37 , the main antenna 1 can have the same structural form as the main antenna 1 in the electronic device 100 shown in FIG9 . Optionally, in the first operating frequency band, the main radiating branch segment 11 of the main antenna 1 generates resonance, specifically, the main radiating branch segment 11 can generate left-hand mode resonance. In the second operating frequency band, part of the main radiating branch segment 11 between the feed point P01 and the third end D3 generates monopole mode resonance, and / or, part of the main radiating branch segment 11 between the feed point P01 and the fourth grounding point P03 and the parasitic branch segment 12 generate ring mode resonance, and / or, the parasitic branch segment 12 generates parasitic resonance.

[0262] Based on this, when the electronic device 100 is in a folded state, please refer to Figure 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.

[0263] Similarly, please continue to refer to Figure 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.

[0264] In this way, in the first frequency band, the electric field 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. 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 band, the electric field is located at the parasitic branch segment 12, and / or part of the main radiation branch segment 11 between the feeding point P01 and the third end D3, and / or 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. 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.

[0265] 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 this application.

[0266] In some embodiments, referring to FIG37 , the filter element 23 can be 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. In this way, in the second operating frequency band, the radiation energy of the entire first branch segment 21 and the entire second branch segment 22 can be fully utilized, which helps to reduce the space occupied by the parasitic branch 2.

[0267] 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 considered as a special limitation to the present application.

[0268] In some embodiments, please refer to FIG37 and FIG38 . FIG38 is a schematic diagram of the structure of the parasitic branch 2 within the electronic device 100 shown in FIG37 . The second branch segment 22 has a first grounding point P1. The first grounding point P1 is not an actual point; it refers to the location on the second branch segment 22 that is coupled to the reference ground.

[0269] 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 .

[0270] 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 longitudinal direction of the second branch segment 22. This embodiment and the following embodiments are illustrative examples in which the first grounding point P1 is located at the end of the second branch segment 22 away from the first branch segment 21.

[0271] Continuing with FIG37 , the portion of the second branch segment 22 located between the first ground point P1 and the first end D1 is a second sub-branch segment 22a. When the filter device is in the blocking state, the second sub-branch segment 22a forms a parasitic branch with a wavelength of (1 / 4 + M / 2), 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 frequency f2, and less than or equal to (1 / 4 + M / 2) times the wavelength corresponding to the frequency f1.

[0272] 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 integral body, which forms a parasitic branch with a wavelength of (1 / 4 + N / 2), where N is 0 or a positive integer. The electrical length of the second integral body 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. This structure is simple and the layout is reasonable.

[0273] 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.

[0274] In some embodiments, referring to Figures 37 and 38 , to reduce the impact of the first branch segment 21 on the radiation efficiency of the main antenna 1 within the first operating frequency band, in some embodiments, the electrical length of the first branch segment 21 is less than or equal to 1 / 4 of the wavelength corresponding to the maximum frequency of the second operating frequency band. This shortens the electrical length of the first branch segment 21 within the first operating frequency band, preventing it from stimulating reverse current, thereby minimizing its impact on the radiation efficiency of the main antenna 1.

[0275] 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.

[0276] In some other embodiments, the boundary conditions of the second branch segment 22 may also be perfect magnetic conductor (PMC) boundary conditions, and the boundary conditions of the first branch segment 21 may be perfect electric conductor (PEC) boundary conditions. Alternatively, 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. Alternatively, 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.

[0277] For example, please refer to Figures 39 and 40. Figure 39 is a front view of an electronic device 100 in a folded state according to some other embodiments of the present application, and Figure 40 is a schematic diagram of the structure of a parasitic branch 2 within the electronic device 100 shown in Figure 39. In this embodiment, the second branch segment 22 has the first grounding point P1 described above, and 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.

[0278] 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 of the first branch segment 21, the second grounding point P2 is spaced apart from the second end D2.

[0279] 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 illustrative examples in which the second grounding point P2 is located at the end of the first branch segment 21 away from the second branch segment 22.

[0280] The portion of the first branch segment 21 located between the second grounding point P2 and the second end D2 is a first sub-branch segment 21 a .

[0281] 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.

[0282] When the filter device is in the 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.

[0283] 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 entity, which forms a ring mode parasitic branch. The electrical length of the second entity 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.

[0284] This structure is simple and easy to operate.

[0285] For another example, please refer to Figures 41 and 42. Figure 41 is a front view of the electronic device 100 provided in some embodiments of the present application when in a folded state, and Figure 42 is a structural schematic diagram of the parasitic branch 2 in the electronic device 100 shown in Figure 41. In this embodiment, the second branch segment 22 is suspended, and the first branch segment 21 has the above-mentioned 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 all perfect electric conductor (PEC) boundary conditions.

[0286] When the filter device is in the blocking state, the second branch segment 22 is suspended and forms a parasitic branch with a wavelength of (1 / 2 + M / 2). 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.

[0287] 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 entity, which forms a (1 / 4 + N / 2)-times-wavelength parasitic branch. The electrical length of the fourth entity 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.

[0288] This structure is simple and easy to operate.

[0289] For further example, please refer to Figure 43, which is a front view of the electronic device 100 in a folded state according to some other 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.

[0290] When the filter device is in the blocking state, the second branch segment 22 forms a parasitic branch with a wavelength of (1 / 2+M / 2). 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.

[0291] 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 integral body that is a (1 / 2+N / 2)-times-wavelength parasitic branch. The electrical length of the first integral body 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.

[0292] This structure is simple and easy to operate.

[0293] 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 .

[0294] The above embodiments are exemplified by taking the electronic device 100 as a folding screen device. In other embodiments, please refer to Figures 44 and 45. Figure 44 is a three-dimensional diagram of the electronic device 100 provided in some embodiments of the present application, and Figure 45 is a structural diagram of the electronic device 100 shown in Figure 44 when viewed from direction D. In this embodiment, the electronic device 100 is a straight-line mobile phone, which includes a screen N and a shell 20. The radiation branches and parasitic branches 2 of the main antenna 1 of the antenna 30 in the electronic device 100 are arranged on the shell 20, specifically on the frame of the shell 20, and the main antenna 1 and the parasitic branches 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.

[0295] 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.

[0296] 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 them. 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)-fold 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 operating frequency band is the Wi-Fi 2.4G frequency band, and the second operating 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.

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