Antenna system and electronic equipment

Abstract

The invention relates to the technical field of wireless communication, and provides an antenna system and electronic equipment, the antenna system comprises a first antenna and a second antenna, each of the first antenna and the second antenna comprises a first frequency band, the center frequency of the first antenna when working in the first frequency band deviates towards a first direction, and / or the center frequency of the second antenna when working in the second frequency band. And when the second antenna works in the second frequency band, the center frequency deviates towards the second direction. According to the embodiment of the invention, the center frequency of the first antenna and the center frequency of the second antenna are adjusted, so that the center frequency of the first frequency band generates frequency offset, the coupling influence between the two antennas is relieved, and the antenna isolation is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communication technologies, and particularly to an antenna system and an electronic device. Background Art

[0002] With the development of wireless communication technologies, the communication frequency bands that mobile terminals need to support are continuously increasing, and the number of antennas is also increasing, which brings great challenges to the antenna design of mobile terminals.

[0003] In related technologies, the Bluetooth frequency band of a mobile terminal usually shares the same antenna with the WiFi 2.4G frequency band, resulting in difficulty in achieving the best Bluetooth performance. An independent Bluetooth antenna can effectively improve the user experience in the Bluetooth scenario, but in the limited space of a mobile terminal, it is difficult to ensure the isolation requirement between the independent Bluetooth antenna and the conventional Bluetooth / WiFi antenna. Summary of the Invention

[0004] To implement an independent Bluetooth antenna in a mobile terminal, embodiments of the present disclosure provide an antenna system and an electronic device having the antenna system.

[0005] In a first aspect, embodiments of the present disclosure provide an antenna system.

[0006] The antenna system includes a first antenna and a second antenna, and the first antenna and the second antenna are relatively and remotely arranged on the frame of the electronic device.

[0007] The operating frequency bands of the first antenna and the second antenna both include a first frequency band.

[0008] When the first antenna operates in the first frequency band, the center frequency shifts in a first direction, and / or when the second antenna operates in the first frequency band, the center frequency shifts in a second direction.

[0009] In some embodiments, the offset rate at which the center frequency of the first antenna shifts in the first direction, and / or the offset rate at which the center frequency of the second antenna shifts in the second direction is 0 to 50%.

[0010] The offset rate represents the ratio of the offset amount of the center frequency shift to half of the frequency band width.

[0011] In some embodiments, the offset rate at which the center frequency of the first antenna shifts in the first direction is 30% to 50%, and the offset rate at which the center frequency of the second antenna shifts in the second direction is 30% to 50%. In some embodiments, the first direction and the second direction are opposite directions of frequency shift.

[0012] In some embodiments, the first antenna includes a first matching circuit, and the first matching circuit includes a first tuning device. By adjusting the device value of the first tuning device, the center frequency of the first antenna in the first frequency band is offset in a first direction.

[0013] The second antenna includes a second matching circuit, and the second matching circuit includes a second tuning device. By adjusting the device value of the second tuning device, the center frequency of the second antenna in the first frequency band is offset in a second direction.

[0014] In some embodiments, both the first tuning device and the second tuning device include a capacitor and / or an inductor.

[0015] In some embodiments, the first frequency band includes a Bluetooth frequency band.

[0016] In some embodiments, the first antenna is disposed on the upper part of the electronic device, and the second antenna is disposed on the lower part of the electronic device.

[0017] In some embodiments, the operating frequency band of the second antenna includes the first frequency band and a medium-high frequency band.

[0018] In a second aspect, an embodiment of the present disclosure provides an electronic device, including the antenna system according to any embodiment of the first aspect.

[0019] The antenna system of the embodiment of the present disclosure includes a first antenna and a second antenna that are relatively and remotely arranged on the frame of the electronic device. Both the first antenna and the second antenna include a first frequency band. When the first antenna operates in the first frequency band, the center frequency is offset in a first direction, and / or when the second antenna operates in a second frequency band, the center frequency is offset in a second direction. In the embodiment of the present disclosure, by adjusting the center frequencies of the first antenna and the second antenna, the center frequency of the first frequency band generates a frequency offset, thereby alleviating the coupling effect between the two antennas and improving the antenna isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of an electronic device according to some embodiments of the present disclosure.

[0022] Figure 2It is a schematic structural diagram of an antenna system according to some embodiments of the present disclosure.

[0023] Figure 3 It is a schematic structural diagram of an antenna system according to some embodiments of the present disclosure.

[0024] Figure 4 It is an effect diagram of an antenna system according to some embodiments of the present disclosure.

[0025] Figure 5 It is a schematic structural diagram of an antenna system according to some embodiments of the present disclosure.

[0026] Figure 6 It is a structural block diagram of an electronic device according to some embodiments of the present disclosure. Specific embodiments

[0027] The technical solutions of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure. In addition, the technical features involved in different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

[0028] With the development of wireless communication technology, the communication frequency bands supported by mobile terminals are continuously increasing. Especially for high-end flagship mobile phone products, they almost need to cover various antenna frequency bands such as 2G, 3G, 4G, 5G, Bluetooth, WiFi, and satellite positioning. Therefore, the number of antennas included in the terminal is also increasing, which brings great challenges to the antenna design of mobile terminals.

[0029] In the related art, since the Bluetooth frequency band (2.4 GHz - 2.485 GHz) and the WiFi 2.4G frequency band (2.4 GHz - 2.4835 GHz) are almost the same frequency, in the limited space of mobile phones, it is often designed that the Bluetooth frequency band and the WiFi 2.4G frequency band share the same antenna, resulting in the difficulty of achieving the best Bluetooth performance. In scenarios with poor anechoic environment, problems such as slow Bluetooth data transmission rate and packet loss often occur.

[0030] Independent Bluetooth, as the name implies, refers to a solution that is different from the conventional scheme of sharing the same antenna with WiFi. Independent Bluetooth can be only used for the Bluetooth frequency band, thereby effectively improving the user experience in the Bluetooth scenario and greatly improving the experience in scenarios such as Bluetooth wireless headsets and Bluetooth inter-device data transfer.

[0031] However, in a compact space, the isolation between the independent Bluetooth antenna and the conventional Bluetooth / WiFi antenna is a difficult point in antenna design.

[0032] In order to achieve the coexistence of a highly available independent Bluetooth antenna and a conventional Bluetooth / WiFi antenna in a compact device space and improve the Bluetooth performance of a mobile terminal, embodiments of the present disclosure provide an antenna system and an electronic device having the antenna system.

[0033] In a first aspect, embodiments of the present disclosure provide an antenna system that can be used in an electronic device. In embodiments of the present disclosure, the electronic device can be any suitable device type, such as a smart phone, a personal digital assistant, a wearable device, etc., and the present disclosure does not limit this.

[0034] In some embodiments, taking a smart phone as an example, the main body structure of the smart phone often includes a carrier frame made of a metal material. On the one hand, the carrier frame is used as the main body support structure of the mobile phone to assemble various structures such as a main board, sensors, a display module, and a back plate.

[0035] On the other hand, the edge of the carrier frame serves as the metal frame of the mobile phone. Currently, the antenna of the smart phone generally forms an antenna radiator by opening a slit in the metal frame. At the same time, the antenna radiator also serves as the outer side frame of the mobile phone. Therefore, there are many limitations for the antenna design of the smart phone. For example, the clearance environment of the smart phone is limited, and the antenna layout is crowded; for another example, the appearance requirements of the smart phone are relatively high, the slit structure is beautiful and the number of slits is as small as possible; for another example, the smart phone requires more communication frequency bands and has high radiation performance requirements; for another example, the SAR (Specific Absorption Ratio) value of the smart phone is required to be strict; etc.

[0036] For example Figure 1 shows the structure of a smart phone in some embodiments of the present disclosure. The mobile phone includes a frame body 100, a screen assembly 200, and a back plate 300. The frame body 100 serves as the main body support structure of the mobile phone, and various electrical and structural components of the mobile phone can be arranged thereon. For example, one side of the frame body 100 is used to install the screen assembly 200 to form the front of the mobile phone, and the other side of the frame body 100 is used to install the back plate 300 to form the back of the mobile phone.

[0037] The frame body 100 includes a bearing portion 120 and a frame 110 formed around the edge of the bearing portion 120. After the screen assembly 200 and the back plate 300 are encapsulated, the frame 110 can serve as the outer side frame of the mobile phone. The frame body 100 can generally be made of a metal material such as aluminum alloy or stainless steel, so that the frame 110 can serve as the metal radiator of the mobile phone antenna system. By opening a slit in the frame 110 and connecting a corresponding radio frequency circuit, signal communication of various frequency bands of the mobile phone can be realized.

[0038] Of course, other various electrical structures can also be included in the smart phone, and the present disclosureFigure 1 This is not shown in the embodiments. For example, a circuit board, various sensors, a battery, etc. are usually provided between the bearing part 120 of the housing 100 and the backplane 300, which can be understood by those skilled in the art, and the present disclosure will not elaborate thereon.

[0039] In addition, for the convenience of understanding and explanation, the frequency band ranges included in the antenna field for low frequency (LB), medium-high frequency (MHB), high frequency (HB), and Bluetooth bands are described below.

[0040] The frequency range of the low frequency (LB) band is approximately 700 MHz to 960 MHz, which mainly includes B5, B8, B12, B17, B20, B28 of the LTE (Long Term Evolution) standard; GSM850 and GSM900 of the GSM (Global System for Mobile Communications) standard; CDMA0, WCDMA5, and WCDMA8 of the CDMA (Code Division Multiple Access) standard; and N28 band of the 5G standard.

[0041] The frequency range of the medium-high frequency (MHB) band is approximately 1710 MHz to 2690 MHz, which mainly includes B1, B3, B4, B7, B34, B38, B39, B40, B41 of the LTE standard; GSM1800 and GSM1900 of the GSM standard; WCDMA1, WCDMA2, WCDMA3, and WCDMA4 of the CDMA standard; and N1, N3, N7, N38, N41 bands of the 5G standard.

[0042] The high frequency (HB) band mainly includes N77 band (frequency range 3.3 GHz to 4.2 GHz), N78 band (frequency range 3.3 GHz to 3.8 GHz), and N79 band (frequency range 4.8 GHz to 4.9 GHz) of the 5G standard.

[0043] The frequency range of the Bluetooth band is approximately 2.4 GHz to 2.5 GHz, and thus, the center frequency of the Bluetooth band is generally about 2.45 GHz.

[0044] It can be understood that the low frequency band described in the following text of the present disclosure includes at least one of the above-mentioned LB bands, the medium-high frequency band includes at least one of the above-mentioned MHB bands, and the high frequency band includes at least one of the above-mentioned HB bands. Unless otherwise specified, the present disclosure will not elaborate thereon.

[0045] Figure 2A structural schematic diagram of a frame antenna system of a mobile terminal in the related art is shown. Only some antennas in the antenna system are shown in the figure, rather than all antennas, and only the antenna radiator formed by the frame is shown. Circuits such as feeding, grounding, and tuning included in the antenna are not shown, but those skilled in the art can undoubtedly understand and fully implement it with reference to the related art, and the present disclosure will not elaborate on this.

[0046] In Figure 2 the example, the antenna ANT1 is generally used as a conventional Bluetooth / WiFi antenna. Since the Bluetooth band and the WiFi band share the same antenna, the Bluetooth performance is poor.

[0047] In order to add an independent Bluetooth antenna on the basis of the original antenna system, a relatively easy-to-think-of solution may be to add an LDS (Laser Direct Structuring) or FPC (Flexible Printed Circuit) antenna inside the mobile terminal as an independent Bluetooth antenna.

[0048] However, for compact space devices such as mobile phones, in order to ensure that the isolation between the independent Bluetooth antenna and the top Bluetooth / WiFi antenna ANT1 meets the requirement of -30 dB, the antenna efficiency of the independent Bluetooth antenna is only -10 dB to -12 dB, which cannot meet the usage requirements. If the performance of the independent Bluetooth antenna is improved (such as increasing the transmission power, adjusting the radiation direction, etc.), the isolation between the independent Bluetooth antenna and the top Bluetooth / WiFi antenna ANT1 will deteriorate to about -17 dB, and the isolation cannot meet the usage requirements.

[0049] It can be seen that only by conventionally increasing the number of antennas cannot meet the performance requirements of the independent Bluetooth and the Bluetooth / WiFi antenna, and the coexistence of the independent Bluetooth and the conventional Bluetooth / WiFi antenna cannot be achieved.

[0050] Therefore, in the embodiments of the present disclosure, in combination with Figure 2 as shown, the independent Bluetooth antenna can be set at the position of the bottom ANT2 antenna of the mobile terminal. The bottom ANT2 antenna is generally a mobile phone medium-high frequency (MHB) band antenna. Among them, B40 (frequency range: 2300 MHz to 2400 MHz) is an essential medium-high frequency band for the mobile terminal. The B40 band is the same frequency as Bluetooth 2.4 GHz. Therefore, using the medium-high frequency band to be compatible with the independent Bluetooth can easily realize the design of the independent Bluetooth antenna without changing the frame structure.

[0051] In addition, in combination with Figure 2It can be seen that the Bluetooth / WiFi antenna ANT1 is located in the upper left corner area of the mobile terminal, while the independent Bluetooth antenna ANT2 is located in the lower right corner area of the mobile terminal. Thus, ANT1 and ANT2 are farthest apart in physical space, so the influence of spatial propagation can be reduced to a certain extent, and the isolation between the two antennas can be improved.

[0052] However, it can be understood that in addition to spatial propagation, the main factor affecting antenna isolation is the mutual coupling of the antenna current passing through other antennas on the metal frame, the floor, etc. Due to the coupling effect, the antenna will generate an induced current on the metal frame, which deteriorates the isolation between the bottom independent Bluetooth antenna ANT2 and the top Bluetooth / WiFi antenna. Therefore, simply increasing the physical space distance between ANT1 and ANT2 cannot meet the isolation requirements of the two Bluetooth antennas.

[0053] In the embodiments of the present disclosure, the center frequencies of the top ANT1 antenna and the bottom ANT2 antenna can be adjusted so that when the two antennas operate in the Bluetooth frequency band, the lowest points (i.e., the center frequency points) of the standing wave curves of the two antennas have frequency offsets, thereby causing a difference in the center frequencies between the bottom independent Bluetooth antenna (ANT2) and the top Bluetooth / WiFi antenna (ANT1), alleviating the influence of the bottom independent Bluetooth antenna on the top Bluetooth / WiFi antenna, and improving the isolation between the two. The following will specifically describe this.

[0054] In some embodiments, the antenna system of the present disclosure includes a first antenna and a second antenna, and the first antenna and the second antenna are relatively far from the device on the frame of the electronic device.

[0055] For example, in one example, refer to Figure 2 As shown, the first antenna can be the ANT1 antenna as shown in Figure 2 which is provided on the top frame of the electronic device. The second antenna can be the ANT2 antenna as shown in Figure 2 which is provided on the bottom frame of the electronic device, so that the first antenna ANT1 and the second antenna ANT2 are relatively far apart on the electronic device.

[0056] Of course, those skilled in the art can understand that the positional relationship between the first antenna and the second antenna is not limited to Figure 2 as shown in Figure 2 and is only provided as an exemplary illustration.

[0057] In the embodiments of the present disclosure, the operating frequency bands of the first antenna and the second antenna both include a first frequency band, and the first frequency band refers to at least one operating frequency band of the first antenna and the second antenna. For example, in one example, the first frequency band can be the Bluetooth frequency band, that is, the operating frequency bands of the first antenna and the second antenna at least include the Bluetooth frequency band.

[0058] Of course, those skilled in the art can understand that the first frequency band is not limited to the Bluetooth frequency band, and can also be any other frequency band suitable for implementation, such as the low-frequency, medium-high-frequency, and high-frequency bands of 4G and 5G antennas, etc. The present disclosure does not limit this.

[0059] Combined with the foregoing, it can be understood that when the first antenna and the second antenna operate in the same frequency band, interference will occur between the antennas. In an electronic device, it is difficult to ensure the antenna isolation degree only by increasing the physical distance between the two antennas. Therefore, in the embodiments of the present disclosure, the center frequencies of the first antenna and / or the second antenna can be adjusted to cause the center frequencies of the two antennas to shift, thereby improving the antenna isolation degree.

[0060] For example, in some embodiments, the center frequency of the first antenna when operating in the first frequency band can be adjusted, for example, the center frequency of the first antenna when operating in the first frequency band is shifted in the first direction.

[0061] For example, in some other embodiments, the center frequency of the second antenna when operating in the first frequency band can be adjusted, for example, the center frequency of the second antenna when operating in the first frequency band is shifted in the second direction.

[0062] For example, in some other embodiments, the center frequencies of the first antenna and the second antenna when operating in the first frequency band can be adjusted simultaneously. For example, the center frequency of the first antenna when operating in the first frequency band is shifted in the first direction, and the center frequency of the second antenna when operating in the first frequency band is shifted in the second direction.

[0063] In the examples of the present disclosure, the first direction and the second direction refer to the opposite directions in which the frequency shifts towards high frequency or low frequency. For example, the first direction is the direction in which the frequency shifts towards high frequency, and the second direction is the direction in which the frequency shifts towards low frequency.

[0064] In one example, taking the Bluetooth frequency band as an example for the first frequency band, according to the foregoing, the frequency range of the Bluetooth frequency band is 2.4 GHz to 2.5 GHz. Without shift, the center frequency of the Bluetooth antenna is generally 2.45 GHz.

[0065] In the embodiments of the present disclosure, the center frequency of the Bluetooth band of the first antenna can be adjusted to shift towards a higher frequency. For example, the center frequency of the Bluetooth band of the first antenna can be adjusted from 2.45 GHz to 2.475 GHz. The center frequency of the Bluetooth band of the second antenna can also be adjusted to shift towards a lower frequency. For example, the center frequency of the Bluetooth band of the second antenna can be adjusted from 2.45 GHz to 2.425 GHz. It is also possible to simultaneously shift the center frequency of the Bluetooth band of the first antenna towards a higher frequency and shift the center frequency of the Bluetooth band of the second antenna towards a lower frequency. For example, the center frequency of the Bluetooth band of the first antenna is adjusted from 2.45 GHz to 2.475 GHz, and the center frequency of the Bluetooth band of the second antenna is adjusted from 2.45 GHz to 2.425 GHz.

[0066] It can be understood that since the center frequencies of the first antenna and the second antenna shift, when both are operating in the first band simultaneously, due to the difference in their center frequencies, the resonant standing wave curve also has a frequency offset and no longer coincides at the lowest point. The frequencies corresponding to the maximum radiation efficiency of the two antennas are different, so the isolation between the two antennas can be effectively improved, meeting the antenna design requirements and achieving coexistence.

[0067] In the following embodiments of the present disclosure, the electronic device will take a smartphone as an example, the antenna system is a frame antenna system mainly set based on the smartphone frame, and the first band will take the Bluetooth band as an example to achieve the coexistence of an independent Bluetooth antenna and a traditional Bluetooth / WiFi antenna.

[0068] For ease of understanding and description below, in combination with Figure 2 As shown, the frame of the smartphone is generally a rectangular (or rounded rectangle) structure, and its frame is enclosed by two parallel short sides and two parallel long sides. In the embodiments of the present disclosure, the top side of the frame is defined as the "top short side", the bottom side of the frame is defined as the "bottom short side", the left side of the frame is defined as the "first long side", and the right side of the frame is defined as the "second long side". The antenna system of the embodiments of the present disclosure will be described below in combination with Figure 3 As shown, the frame of the smartphone is generally a rectangular (or rounded rectangle) structure, and its frame is enclosed by two parallel short sides and two parallel long sides. In the embodiments of the present disclosure, the top side of the frame is defined as the "top short side", the bottom side of the frame is defined as the "bottom short side", the left side of the frame is defined as the "first long side", and the right side of the frame is defined as the "second long side". The antenna system of the embodiments of the present disclosure will be described below in combination with

[0069] As Figure 3 shown, in some embodiments, the antenna system of the present disclosure example includes a first antenna ANT1 and a second antenna ANT2.

[0070] The first antenna ANT1 is configured such that its operating frequency band includes the Bluetooth frequency band and the WiFi frequency band, that is, the first antenna ANT1 is a Bluetooth / WiFi antenna. The second antenna ANT2 is configured such that its operating frequency band at least includes the Bluetooth frequency band, that is, the second antenna ANT2 is an independent Bluetooth antenna. Combining the foregoing, it can be seen that in the traditional solution, when the first antenna ANT1 and the second antenna ANT2 operate in the Bluetooth frequency band, the center frequencies of the two should be the same or close, both being about 2.45 GHz, so the degree of mutual interference between the two antennas is relatively large.

[0071] In the embodiments of the present disclosure, both the first antenna ANT1 and the second antenna ANT2 are frame antennas, that is, the radiator of the antenna is formed by opening a slit in the metal frame of the electronic device, and the corresponding resonant frequency is achieved by feeding and grounding the radiator. In the drawings of the embodiments of the present disclosure, only the radiator part of the antenna is shown, and the electrical part of the antenna system is not shown. For example, the circuit structures of circuits such as the feeding, grounding, and tuning of the antenna are not shown. Those skilled in the art can understand this, and the present disclosure will not elaborate further.

[0072] In the embodiments of the present disclosure, the first antenna and the second antenna are arranged relatively far away from each other on the frame of the electronic device. For example Figure 3 In the example, the first antenna ANT1 is arranged on the short side at the top, the second antenna ANT2 is arranged on the short side at the bottom, and the first antenna ANT1 is close to the first long side, and the second antenna ANT2 is close to the second long side. That is, in the length direction of the electronic device, the first antenna ANT1 and the second antenna ANT2 are respectively arranged on the upper and lower sides, and in the width direction of the electronic device, the first antenna ANT1 and the second antenna ANT2 are respectively arranged on the left and right sides.

[0073] It can be understood that in Figure 3 In the example, the first antenna ANT1 and the second antenna ANT2 are arranged diagonally, so that the first antenna ANT1 and the second antenna ANT2 are farthest from each other in physical space, thereby minimizing the influence of space propagation and improving the isolation degree of the two antennas.

[0074] However, combining the foregoing, only increasing the space distance cannot make the isolation degree of the first antenna ANT1 and the second antenna ANT2 meet the requirements. Therefore, in the embodiments of the present disclosure, when designing the antenna system, it is necessary to shift the center frequency of the Bluetooth frequency band of the first antenna ANT1 and / or the second antenna ANT2, so as to make the Bluetooth center frequencies of the first antenna ANT1 and the second antenna ANT2 different.

[0075] It can be understood that in the embodiments of the present disclosure, in order to achieve the purpose of generating a difference in the Bluetooth center frequencies of the first antenna ANT1 and the second antenna ANT2, the center frequency of only the first antenna ANT1 can be adjusted, or the center frequency of only the second antenna ANT2 can be adjusted, or the center frequencies of both the first antenna ANT1 and the second antenna ANT2 can be adjusted simultaneously. The following will be described separately.

[0076] 1) Adjusting only the center frequency of the first antenna ANT1

[0077] For example, in one example, when the second antenna ANT2 operates in the Bluetooth frequency band, its center frequency is 2.45 GHz. In the embodiments of the present disclosure, the center frequency of the first antenna ANT1 can be shifted from 2.45 GHz to a higher frequency of 2.475 GHz, so as to generate a difference between the center frequency of the first antenna ANT1 and the center frequency of the second antenna ANT2.

[0078] 2) Adjusting only the center frequency of the second antenna ANT2

[0079] For example, in one example, when the first antenna ANT1 operates in the Bluetooth frequency band, its center frequency is 2.45 GHz. In the embodiments of the present disclosure, the center frequency of the second antenna ANT2 can be shifted from 2.45 GHz to a lower frequency of 2.425 GHz, so as to generate a difference between the center frequency of the second antenna ANT2 and the center frequency of the first antenna ANT1.

[0080] 3) Adjusting the center frequencies of both the first antenna ANT1 and the second antenna ANT2 simultaneously

[0081] For example, in one example, the center frequency of the first antenna ANT1 can be shifted from 2.45 GHz to a higher frequency of 2.475 GHz, and the center frequency of the second antenna ANT2 can be shifted from 2.45 GHz to a lower frequency of 2.425 GHz, so as to generate a difference between the center frequency of the second antenna ANT2 and the center frequency of the first antenna ANT1.

[0082] In any of the above embodiments, in order to adjust the antenna resonance frequency, it can be achieved by changing the device value of the tuning device in the antenna matching circuit. The tuning device generally includes a capacitor and / or an inductor. The device value of the capacitor is the capacitance value, and the device value of the inductor is the inductance value.

[0083] In some embodiments, the first antenna includes a first matching circuit, and the function of the first matching circuit is to match a suitable circuit impedance for the first antenna, so as to adjust the resonance frequency of the first antenna.

[0084] The first matching circuit includes a first tuning device. The first tuning device can be a capacitor and / or an inductor. For example, in one example, taking the inductor as the first tuning device, when the inductance value of the inductor is L1, the center frequency of the first antenna is 2.45 GHz. The adjustment of the center frequency of the first antenna can be achieved by changing the magnitude of the inductance value of the inductor. For example, when the inductance value is increased from L1 to L2, the center frequency of the first antenna shifts to a lower frequency of 2.425 GHz.

[0085] In some embodiments, the second antenna includes a second matching circuit. The function of the second matching circuit is to match a suitable circuit impedance for the second antenna, thereby achieving the adjustment of the resonant frequency of the second antenna.

[0086] The second matching circuit includes a second tuning device. The second tuning device can be a capacitor and / or an inductor. For example, in one example, taking the capacitor as the second tuning device, when the capacitance value of the capacitor is C1, the center frequency of the second antenna is 2.45 GHz. The adjustment of the center frequency of the second antenna can be achieved by changing the magnitude of the capacitance value of the capacitor. For example, when the capacitance value is increased from C1 to C2, the center frequency of the second antenna shifts to a higher frequency of 2.475 GHz.

[0087] Of course, those skilled in the art can understand that the above is only an exemplary illustration of the present disclosure. Based on the above theoretical guidance, those skilled in the art can specifically adjust the tuning device to achieve the frequency offset adjustment of the first antenna and the second antenna, and the present disclosure will not elaborate further.

[0088] In the embodiments of the present disclosure, to facilitate the description of the degree of frequency offset of the antenna, the "offset rate η" of the antenna center frequency is defined, and the offset rate η is expressed as:

[0089]

[0090] In formula (1), f represents the center frequency after offset, f0 represents the center frequency before offset, f max represents the maximum frequency of the first frequency band, f min represents the minimum frequency of the first frequency band.

[0091] For example, in one example, taking the Bluetooth frequency band (2.4 GHz - 2.5 GHz) as the first frequency band, thus f max = 2.5 GHz, f min = 2.4 GHz. Assuming that the center frequency f0 of the first antenna before offset is 2.45 GHz and the center frequency after offset is f = 2.475 GHz. Substituting them into formula (1), the offset rate η of the center frequency of the first antenna can be calculated as η = 50%.

[0092] In some embodiments, considering that if the center frequency of the antenna deviates too much, it is likely to cause a serious attenuation of the antenna radiation efficiency, thus affecting the antenna performance. Therefore, in the embodiments of the present disclosure, the deviation rate of the center frequency of the first antenna ANT1 can be set to 0-50%, and the deviation rate of the center frequency of the second antenna ANT2 can be set to 0-50%.

[0093] In some embodiments, in order to balance the antenna efficiency and isolation, the deviation rate of the center frequency of the first antenna deviating in the first direction can be set to 30%-50%, and the deviation rate of the center frequency of the second antenna deviating in the second direction can be set to 30%-50%.

[0094] For example, taking the first frequency band as the Bluetooth frequency band, the first direction is the high-frequency direction, and the second direction is the low-frequency direction. Thus, the center frequency range of the first antenna ANT1 is 2.465 GHz to 2.475 GHz, and the center frequency range of the second antenna ANT2 is 2.425 GHz to 2.435 GHz.

[0095] Combined with the foregoing, it can be known that the deviation adjustment of the center frequency can be achieved by adjusting the device value of the tuning device in the matching circuits of the first antenna and the second antenna. In a guiding example, when the device value of the tuning device changes by 5%-15%, the deviation rate of the center frequency of the antenna can reach 30%-50%. Those skilled in the art can achieve the deviation adjustment of the antenna frequency accordingly.

[0096] As can be seen from the above, in the embodiments of the present disclosure, by adjusting the center frequencies of the first antenna and the second antenna, the center frequency of the first frequency band is frequency-offset, thereby alleviating the coupling effect between the two antennas and improving the antenna isolation.

[0097] As Figure 3 shown, in some embodiments, the operating frequency band of the second antenna ANT2 can include not only the Bluetooth frequency band but also the medium-high frequency (MHB) band, that is, the original medium-high frequency antenna can be used to be compatible with the independent Bluetooth antenna, so that the design of the independent Bluetooth antenna can be realized without changing the frame structure. In Figure 3 the example, the second antenna ANT2 is provided with a tuning switch SW, and the tuning switch SW can be used to switch each frequency band included in the medium-high frequency (MHB).

[0098] Through simulation tests, in the embodiments of the present disclosure, the isolation between the independent Bluetooth antenna and the conventional Bluetooth / WiFi antenna can reach more than -35 dB, which can fully meet the antenna design requirement of -30 dB, and referring to Figure 4As shown, the currents of the bottom independent Bluetooth and the top conventional Bluetooth / WiFi antennas are independent of each other and have little mutual influence. Thus, the high-availability coexistence of the independent Bluetooth antenna and the conventional Bluetooth / WiFi antenna is achieved, which can effectively improve the Bluetooth performance of the electronic device and enhance the Bluetooth transmission rate and stability.

[0099] In the embodiments of the present disclosure, in addition to using the adjustment of the center frequency difference between the two antennas to improve the antenna isolation, the choke effect on the induced current in the Bluetooth frequency band on the metal frame can also be achieved by using the parasitic stub of the low-frequency (LB) antenna, so as to further improve the isolation between the two Bluetooth antennas.

[0100] See Figure 5 As shown, in the embodiments of the present disclosure, the parasitic stub of the low-frequency (LB) antenna ANT3 located on the opposite side of the ANT2 antenna can be used to decouple the bottom independent Bluetooth antenna and the top Bluetooth / WiFi antenna. By adjusting the appropriate length of the parasitic stub of the low-frequency antenna ANT3, a resonance mode in the Bluetooth frequency band is coupled out on the parasitic stub, so that the induced current generated by the bottom independent Bluetooth antenna forms a choke effect at the position of the parasitic stub, avoiding the propagation of the induced current along the metal frame and affecting the antenna isolation.

[0101] In Figure 5 the example, the third antenna ANT3 is disposed at a position on the first long side and close to the bottom short side, that is, at the lower left corner position of the metal frame. The third antenna ANT3 includes a first radiation stub 101 and a first parasitic stub 201 that is coupled to the first radiation stub 101 through a first gap.

[0102] The third antenna ANT3 is a low-frequency antenna, and its radiator length is generally long. Moreover, in the related art, it is generally necessary to use the low-frequency antenna to be compatible with the SAR detection. Therefore, the first radiation stub 101 of the third antenna ANT3 is a bent L-shaped floating stub, that is, there is no rigid structure connection between the first radiation stub 101 and the carrier part 120. Those skilled in the art can understand this, and the present disclosure will not elaborate further.

[0103] It should be noted that in the embodiments of the present disclosure, the operating frequency band of the third antenna ANT3 needs to include at least the LB band. At the same time, the third antenna ANT3 can also be further compatible with some frequency bands of the medium-high frequency (MHB) and high frequency (HB). For example, in one example, the operating frequency band of the third antenna ANT3 can include the low-frequency band (LB), N41, and N78 frequency bands. Those skilled in the art can understand this, and the present disclosure will not elaborate further.

[0104] Continue to refer to Figure 5As shown, the first radiation stub 101 is formed by a partial border of the bottom short side and a partial border of the first long side. On the first long side, the first radiation stub 101 is coupled to the first parasitic stub 201 through a first gap. For example, the first radiation stub 101 and the first parasitic stub 201 can be formed by opening a slit in the border of the first long side. One end of the first parasitic stub 201 is coupled to the first radiation stub 101, and the other end is grounded through a rigid structure, that is, connected to the carrier part 120 through a ground return rib position to achieve grounding. After feeding the first radiation stub 101, the first parasitic stub 201 on the opposite side can be used as an antenna parasitic structure.

[0105] As Figure 5 shown, the length of the first parasitic stub 201 is L. Through research, it is found that changing the length L of the first parasitic stub 201 has little effect on the low-frequency performance of the third antenna ANT3. However, by setting an appropriate length L of the first parasitic stub 201, a resonance mode in the Bluetooth frequency band can be induced on the first parasitic stub 201. Thus, a stop band for the Bluetooth 2.4 GHz frequency band can be formed at the position of the first parasitic stub 201, achieving a choke effect on the induced current in the Bluetooth frequency band on the metal border.

[0106] Combined with Figure 5 shown, when both the top first antenna ANT1 and the bottom second antenna ANT2 operate in the Bluetooth frequency band, the resonance generated by the bottom independent Bluetooth will generate an induced current on the border and the body of the device. When the induced current propagates upward along the left border and reaches the position of the first parasitic stub 201, the resonance mode in the Bluetooth frequency band induced by the first parasitic stub 201 will lock the induced current in the Bluetooth frequency band flowing through it in the resonance circuit, thus forming a choke effect on the Bluetooth frequency band, preventing the induced current from continuing to propagate upward, and thus not affecting the top first antenna ANT1, improving the isolation between the two Bluetooth antennas.

[0107] In some embodiments of the present disclosure, the length L of the first parasitic stub 201 can be selected through experimental debugging. For example, the real antenna environment can be simulated through simulation software, and by adjusting the length L of the first parasitic stub 201, the resonance mode on the first parasitic stub 201 can be adjusted until the resonance frequency is close to or equal to the Bluetooth frequency band (2.4 GHz frequency band), that is, the debugging of the first parasitic stub 201 is completed.

[0108] Taking the smartphone scenario as an example, in some embodiments, the length L of the first parasitic stub can be 13 mm to 20 mm. Within this length range, the first parasitic stub 201 has a better stop band effect on the Bluetooth frequency band, and can ensure the isolation requirement of -30 dB for the Bluetooth frequency band between the first antenna ANT1 and the second antenna ANT2.

[0109] In an exemplary embodiment, the length L of the first parasitic stub can be 18 mm, which can ensure that the isolation degree of the Bluetooth frequency band between the first antenna ANT1 and the second antenna ANT2 reaches more than -40 dB, fully meeting the antenna usage requirements.

[0110] In some embodiments, the first radiating stub 101 of the third antenna ANT3 can be set as a floating stub as described in the above embodiments, that is, there is no rigid structure ground connection between the first radiating stub 101 and the carrier part 120.

[0111] In other embodiments, in order to ensure the structural strength, the first radiating stub 101 can also be grounded through a rigid rib position. However, in order to ensure that the induced current of the bottom independent Bluetooth antenna (i.e., the second antenna ANT2) can reach the first parasitic stub 201, the width of the rigid rib position where the first radiating stub 101 is grounded needs to be as small as possible. For example, in some embodiments, the width of the rigid rib position is less than 3 mm.

[0112] As can be seen from the above, in the embodiments of the present disclosure, by adjusting the center frequencies of the first antenna and the second antenna, the center frequency of the first frequency band generates a frequency offset, thereby alleviating the coupling effect between the two antennas and improving the antenna isolation degree.

[0113] In addition, further utilizing the parasitic stub of the low-frequency antenna enables the induced current in the Bluetooth frequency band to form a choke effect at the position of the parasitic stub when propagating along the metal frame, thereby improving the isolation degree between the independent Bluetooth antenna and the traditional Bluetooth / WiFi antenna, realizing the highly available coexistence of the independent Bluetooth and the Bluetooth / WiFi antenna. Moreover, since an independent Bluetooth antenna is added, the Bluetooth performance of the electronic device can be effectively improved, and the Bluetooth transmission rate and stability can be enhanced.

[0114] Through simulation tests, in Figure 5 the embodiment, the isolation degree between the independent Bluetooth antenna and the conventional Bluetooth / WiFi antenna can reach more than -40 dB, fully meeting the antenna design requirement of -30 dB, and realizing the highly available coexistence of the independent Bluetooth antenna and the conventional Bluetooth / WiFi antenna.

[0115] In a second aspect, the embodiments of the present disclosure provide an electronic device, which includes the antenna system described in any of the above embodiments. In some embodiments, the electronic device of the present disclosure can be any suitable device type, such as a smart phone, a palm computer, a wearable device, etc., and the present disclosure does not limit this.

[0116] In some embodiments, the electronic device includes a housing, and the housing includes a frame, where the frame refers to the external structure on the sides of the electronic device. In the embodiments of the present disclosure, the first antenna ANT1, the second antenna ANT2, and the third antenna ANT3 in the above antenna system can be formed by the frame of the electronic device, that is, a part of the frame of the electronic device is used as each radiation branch. Those skilled in the art can understand this and details are not described herein again.

[0117] In some embodiments, the first radiation branch of the de-isolation antenna can be disposed inside the electronic device through an FPC (Flexible Printed Circuit) or LDS (Laser-Direct-structuring) process. The present disclosure does not limit this.

[0118] Figure 6 The block diagram of the electronic device in some embodiments of the present disclosure is shown below. In combination with Figure 6 the electronic device in some embodiments of the present disclosure will be described.

[0119] Referring to Figure 6 , the electronic device 1800 may include one or more of the following components: a processing component 1802, a memory 1804, a power supply component 1806, a multimedia component 1808, an audio component 1810, an input / output (I / O) interface 1812, a sensor component 1816, and a communication component 1818.

[0120] The processing component 1802 generally controls the overall operation of the electronic device 1800, such as operations associated with display, telephone call, data communication, camera operation, and recording operation. The processing component 1802 may include one or more processors 1820 to execute instructions. In addition, the processing component 1802 may include one or more modules to facilitate the interaction between the processing component 1802 and other components. For example, the processing component 1802 may include a multimedia module to facilitate the interaction between the multimedia component 1808 and the processing component 1802. Another example is that the processing component 1802 may read executable instructions from the memory to implement functions related to the electronic device.

[0121] The memory 1804 is configured to store various types of data to support the operation of the electronic device 1800. Examples of such data include instructions for any application or method operating on the electronic device 1800, contact data, phone book data, messages, pictures, videos, and the like. The memory 1804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disks, or optical disks.

[0122] The power supply component 1806 provides power to various components of the electronic device 1800. The power supply component 1806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 1800.

[0123] The multimedia component 1808 includes a display screen that provides an output interface between the electronic device 1800 and the user. In some embodiments, the multimedia component 1808 includes a front camera and / or a rear camera. When the electronic device 1800 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front camera and the rear camera can be a fixed optical lens system or have a focal length and optical zoom capabilities.

[0124] The audio component 1810 is configured to output and / or input audio signals. For example, the audio component 1810 includes a microphone (MIC) that is configured to receive external audio signals when the electronic device 1800 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 1804 or transmitted via the communication component 1818. In some embodiments, the audio component 1810 further includes a speaker for outputting audio signals.

[0125] The I / O interface 1812 provides an interface between the processing component 1802 and the peripheral interface module, and the peripheral interface module can be a keyboard, a click wheel, buttons, and the like. These buttons can include, but are not limited to: a home button, a volume button, a start button, and a lock button.

[0126] The sensor assembly 1816 includes one or more sensors for providing a status assessment of various aspects of the electronic device 1800. For example, the sensor assembly 1816 can detect the on / off state of the electronic device 1800, the relative positioning of components, such as the display and keypad of the electronic device 1800. The sensor assembly 1816 can also detect a change in the position of the electronic device 1800 or a component of the electronic device 1800, the presence or absence of user contact with the electronic device 1800, the orientation or acceleration / deceleration of the electronic device 1800, and the temperature change of the electronic device 1800. The sensor assembly 1816 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 1816 can also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 1816 can also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0127] The communication component 1818 is configured to facilitate communication between the electronic device 1800 and other devices in a wired or wireless manner. The electronic device 1800 can access a wireless network based on communication standards, such as Wi-Fi, 2G, 3G, 4G, 5G, or 6G, or a combination thereof. In an exemplary embodiment, the communication component 1818 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1818 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0128] In an exemplary embodiment, the electronic device 1800 can be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0129] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the embodiments. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the embodiments here. And the obvious changes or variations derived therefrom are still within the protection scope of this disclosure.

Claims

1. An antenna system, characterized in that the antenna system includes a first antenna and a second antenna, and the first antenna and the second antenna are relatively and remotely arranged on the frame of the electronic device; the operating frequency bands of both the first antenna and the second antenna include a first frequency band; when the first antenna operates in the first frequency band, its center frequency shifts in a first direction, and / or when the second antenna operates in the first frequency band, its center frequency shifts in a second direction.

2. The antenna system according to claim 1, characterized in that the offset rate of the center frequency of the first antenna shifting in the first direction, and / or the offset rate of the center frequency of the second antenna shifting in the second direction is 0 to 50%; the offset rate represents the ratio of the offset amount of the center frequency shift to half of the bandwidth.

3. The antenna system according to claim 2, characterized in that the offset rate of the center frequency of the first antenna shifting in the first direction is 30% to 50%, and the offset rate of the center frequency of the second antenna shifting in the second direction is 30% to 50%.

4. The antenna system according to claim 1, characterized in that the first direction and the second direction are opposite directions of frequency offset.

5. The antenna system according to claim 1, characterized in that the first antenna includes a first matching circuit, and the first matching circuit includes a first tuning device. By adjusting the device value of the first tuning device, the center frequency of the first antenna in the first frequency band shifts in the first direction; the second antenna includes a second matching circuit, and the second matching circuit includes a second tuning device. By adjusting the device value of the second tuning device, the center frequency of the second antenna in the first frequency band shifts in the second direction.

6. The antenna system according to claim 5, characterized in that both the first tuning device and the second tuning device include a capacitor and / or an inductor.

7. The antenna system according to any one of claims 1 to 6, characterized in that the first frequency band includes a Bluetooth frequency band.

8. The antenna system according to any one of claims 1 to 6, characterized in that the first antenna is arranged at the upper part of the electronic device, and the second antenna is arranged at the lower part of the electronic device.

9. The antenna system according to any one of claims 1 to 6, characterized in that the operating frequency band of the second antenna includes the first frequency band and a medium and high frequency band.

10. An electronic device, characterized in that, An electronic device includes the antenna system according to any one of claims 1 to 9.

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