Antenna isolation circuit, antenna module and electronic device

Abstract

The present disclosure relates to an antenna isolation circuit, an antenna module and an electronic device, the antenna isolation circuit comprising: a first floating antenna arm, a resonance circuit, an isolation device, a pi-type matching circuit and a first frequency band antenna, a first end of the resonance circuit is connected with a first end of the first floating antenna arm, a second end of the resonance circuit is connected with an equipotential, a first end of the isolation device is connected with the first end of the first floating antenna arm, a second end of the isolation device is connected with a first end of the pi-type matching circuit, a second end of the pi-type matching circuit is connected with the first frequency band antenna, a third end and a fourth end of the pi-type matching circuit are respectively connected with the equipotential, and the first frequency band antenna is connected with the equipotential. Thus, the isolation between antennas is improved, the problem of reduced antenna efficiency and deteriorated performance caused by mutual interference between antennas is avoided, each antenna works independently, and the signal quality and signal strength of each frequency band electromagnetic wave signal are improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of antennas, and in particular to an antenna isolation circuit, an antenna module and an electronic device. BACKGROUND

[0002] With more and more frequency bands supported by antennas, users have higher and higher requirements for signal quality and signal strength, which causes the influence of radiation on human bodies to be more serious. Excessive electromagnetic radiation of a wireless communication terminal can cause negative effects on human health. Long-term electromagnetic radiation exposure can make people feel physically tired, eye fatigue, shoulder pain, headache, and unease. In related technologies, Sar (Specific Absorption Rate) detection measures the radiation of a wireless communication terminal by detecting an antenna in the terminal. By introducing a Sar detection scheme into the terminal, triggering power reduction in a specific scenario, and ensuring the communication performance of the terminal, the influence of radiation on human bodies is reduced, and user experience is improved.

[0003] Sar detection needs to detect the change of the ground capacitance to identify the scenario, and determines whether to trigger hard power reduction through scenario identification. Therefore, the corresponding detection object cannot be grounded, and a ground loop cannot be formed between the antennas, which causes the current of the antennas to affect each other when the antennas are working, and thus the performance of the antennas deteriorates sharply. SUMMARY

[0004] To overcome the problems in related technologies, the present disclosure provides an antenna isolation circuit, an antenna module and an electronic device, which are used to solve the technical problem of deteriorating performance of antennas due to insufficient isolation between antennas with similar working frequency bands because the antenna arms cannot be grounded when the antennas receive signals.

[0005] According to a first aspect of an embodiment of the present disclosure, an antenna isolation circuit is provided, comprising: a first floating antenna arm, a resonance circuit, an isolation device, a π-type matching circuit and a first frequency band antenna.

[0006] A first end of the resonance circuit is connected to a first end of the first floating antenna arm, and a second end of the resonance circuit is connected to an equipotential.

[0007] A first end of the isolation device is connected to the first end of the first floating antenna arm, and a second end of the isolation device is connected to a first end of the π-type matching circuit.

[0008] A second end of the π-type matching circuit is connected to the first frequency band antenna, and a third end and a fourth end of the π-type matching circuit are respectively connected to an equipotential.

[0009] The first frequency band antenna is connected to an equipotential.

[0010] Optionally, the isolating device is configured to transmit a sub-low frequency signal in the electromagnetic wave signal to the pi-type matching circuit.

[0011] The pi-type matching circuit is configured to convert the sub-low frequency signal into a compensation low frequency signal and transmit the compensation low frequency signal to the first frequency band antenna.

[0012] The first frequency band antenna is configured to transmit the compensation low frequency signal to an equipotential.

[0013] Optionally, the resonant circuit comprises a first capacitor and a first inductor, a first end of the first capacitor is a first end of the resonant circuit, a second end of the first capacitor is connected with a first end of the first inductor, and a second end of the first inductor is a second end of the resonant circuit.

[0014] The isolating device is a second capacitor, and the pi-type matching circuit comprises a third capacitor, a second inductor and a fourth capacitor.

[0015] A first end of the second capacitor is connected with a first end of the first suspended antenna arm, a second end of the second capacitor is connected with a first end of the third capacitor and a first end of the second inductor, and a second end of the third capacitor is a third end of the pi-type matching circuit.

[0016] A second end of the second inductor is connected with a first end of the first frequency band antenna and a first end of the fourth capacitor.

[0017] A second end of the fourth capacitor is a fourth end of the pi-type matching circuit, and a second end of the first frequency band antenna is connected with an equipotential.

[0018] Optionally, the antenna isolation circuit further comprises a fifth capacitor, a first end of the fifth capacitor is connected with a second end of the first suspended antenna arm, and a second end of the fifth capacitor is grounded.

[0019] Optionally, the antenna isolation circuit further comprises a second antenna arm, a second frequency band antenna and a third frequency band antenna.

[0020] A first end of the second antenna arm is opposite to a first end of the first suspended antenna arm, and a second end of the second antenna arm is opposite to a second end of the first suspended antenna arm.

[0021] A first end of the second frequency band antenna is connected with a second end of the second antenna arm, and a second end of the second frequency band antenna is connected with an equipotential.

[0022] A first end of the third frequency band antenna is connected with a first end of the second antenna arm, and a second end of the third frequency band antenna is connected with an equipotential.

[0023] Optionally, the antenna isolation circuit further comprises a fourth frequency band antenna and a fifth frequency band antenna.

[0024] The first end of the fourth frequency band antenna is connected with a third end of the second antenna arm, the third end is located within a preset distance near the first end, and the second end of the fourth frequency band antenna is connected with an equipotential.

[0025] The first end of the fifth frequency band antenna is connected with a fourth end of the second antenna arm, the fourth end is located within a preset distance near the second end, and the second end of the fifth frequency band antenna is connected with an equipotential.

[0026] Optionally, the first frequency band antenna comprises a GPS L5 antenna, the second frequency band antenna comprises a GPS L1 antenna and a WIFI 2.4 antenna, the third frequency band antenna comprises an MHB antenna, the fourth frequency band antenna comprises a WIFI 6e antenna, and the fifth frequency band antenna comprises an N78 and / or N79 antenna.

[0027] Optionally, when the floating antenna arm receives an electromagnetic wave signal, the resonant circuit is configured to intercept a medium frequency signal in the electromagnetic wave signal and transmit the medium frequency signal to an equipotential.

[0028] The second capacitor is configured to isolate a low frequency signal in the electromagnetic wave signal.

[0029] The second frequency band antenna is configured to receive the low frequency signal sent by the first floating antenna arm and transmit the low frequency signal to an equipotential.

[0030] The third frequency band antenna receives the high frequency signal sent by the first floating antenna arm and transmits the high frequency signal to an equipotential.

[0031] According to a second aspect of the embodiments of the present disclosure, an antenna module is provided, comprising the antenna isolation circuit provided in the first aspect of the present disclosure.

[0032] According to a third aspect of the embodiments of the present disclosure, an electronic device is provided, comprising the antenna module provided in the second aspect of the present disclosure.

[0033] The technical solutions provided by the embodiments of the present disclosure can include the following beneficial effects:

[0034] By the technical scheme, the resonance circuit is connected in series in the connecting circuit of the sub-low frequency antenna, the resonance frequency of the resonance circuit is set as the intermediate frequency, so that the intermediate frequency signal in the electromagnetic wave signal is quickly grounded at the sub-low frequency antenna side, and the isolation device is connected in series in the sub-low frequency antenna, the low frequency signal and the high frequency signal in the electromagnetic wave signal are isolated, the isolation degree between the high frequency antenna and the low frequency antenna in the antenna module is improved, the problem that the antenna efficiency is reduced and the performance is deteriorated due to the mutual interference between the antennas is avoided, the antennas work independently from each other, and the signal quality and the signal strength of the electromagnetic wave signals of each frequency band are improved.

[0035] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0036] The accompanying drawings, which are incorporated into and form part of the specification, illustrate an embodiment consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0037] Figure 1 is a structural diagram of an antenna isolation circuit according to an exemplary embodiment.

[0038] Figure 2 is a structural diagram of an antenna module according to an exemplary embodiment.

[0039] Figure 3 is a block diagram of an electronic device according to an exemplary embodiment.

[0040] BRIEF DESCRIPTION OF DRAWINGS

[0041] 110 - first floating antenna arm; 120 - resonance circuit; 121 - first capacitor; 122 - first inductor; 130 - isolation device; 131 - second capacitor; 140 - π-type matching circuit; 141 - third capacitor; 142 - second inductor; 143 - fourth capacitor; 150 - first frequency band antenna; 160 - fifth capacitor; 170 - second antenna arm; 180 - second frequency band antenna; 190 - third frequency band antenna; 200 - fourth frequency band antenna; 210 - fifth frequency band antenna. DETAILED DESCRIPTION

[0042] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0043] In order for those skilled in the art to more easily understand the improvements of the embodiments of the present disclosure over the prior art, a brief introduction to the related technical solutions in the prior art is first provided.

[0044] The Sar detection scheme is used to measure the radiation of the mobile terminal to the human body by detecting the electromagnetic wave signal in the antenna. In order to improve the frequency of using the mobile terminal by the user and reduce the negative impact caused by the radiation, the manufacturers introduce the Sar detection scheme into the mobile terminal to monitor the radiation of the mobile terminal. When the mobile terminal is in a related application scenario and the radiation exceeds the threshold, the power reduction mode can be used to reduce the radiation of the mobile terminal based on the warning signal of the Sar detection.

[0045] The radiation of the mobile terminal to the user is affected by the distance. The closer the mobile terminal is to the user, the stronger the corresponding radiation. Therefore, the Sar detection scheme identifies the use scenario by detecting the change of the ground capacitance of the mobile terminal. When the user uses the mobile terminal to touch a specific scenario, the system automatically calls the power reduction mode to reduce the radiation to the human body. For example, when the user uses the mobile terminal to answer the phone, the mobile terminal is close to the head of the person. The change of the capacitance is detected to identify the phone answering scenario. The scenario identification system automatically calls the power reduction mode to reduce the harm caused by the radiation of the mobile terminal to the human body in the phone answering scenario. Therefore, in the mobile terminal with the Sar detection scheme, the ground return loop cannot be formed between the corresponding antennas of the mobile terminal, so that the isolation degree between the antennas with similar frequency bands is not enough, the current between them is affected, the transmission efficiency of the antenna is reduced, and the performance is deteriorated. In order to solve the problems in the related art, the present disclosure provides an antenna isolation circuit.

[0046] Figure 1 is a structural diagram of an antenna isolation circuit according to an exemplary embodiment. As shown in Figure 1 The antenna isolation circuit includes a first floating antenna arm 110, a resonant circuit 120, an isolation device 130, a pi-type matching circuit 140, and a first frequency band antenna 150.

[0047] The first end of the resonant circuit 120 is connected to the first end of the first floating antenna arm 110, and the second end of the resonant circuit 120 is connected to the equipotential.

[0048] The first end of the isolation device 130 is connected to the first end of the first floating antenna arm 110, and the second end of the isolation device 130 is connected to the first end of the pi-type matching circuit 140.

[0049] The second end of the pi-type matching circuit 140 is connected to the first frequency band antenna 150, and the third end and the fourth end of the pi-type matching circuit 140 are respectively connected to the equipotential.

[0050] The first frequency band antenna 150 is connected to the equipotential.

[0051] It can be understood that the mobile terminal receives or transmits electromagnetic wave signals through the antenna arm, receives the electromagnetic wave signals, and converts the electromagnetic wave signals into electrical signals, thereby realizing information reception; or transmits the electrical signals to other terminals by converting the electrical signals into electromagnetic wave signals, thereby realizing information transmission. The electromagnetic wave signals include multiple frequency bands, and different frequency bands of the electromagnetic wave signals are received through different frequency band antennas. In order to enhance the signal of the mobile terminal, multiple antennas are usually arranged to ensure signal quality and signal strength. Common types of mobile terminal antennas include GPS (Global Positioning System) antennas and WIFI (wireless network communication) antennas. The working frequency bands of various types of antennas may overlap. When the ground return loop cannot be formed between the antennas of the mobile terminal, the antennas working in the same frequency band or similar frequency band are easily affected due to insufficient mutual isolation.

[0052] In this embodiment, the resonant circuit 120 is connected in series in the first frequency band antenna 150, and the resonant frequency in the resonant circuit 120 is adjusted, so that the resonant circuit 120 intercepts the intermediate frequency signal in the electromagnetic wave signal received by the first floating antenna arm 110 and transmits the intermediate frequency signal to the equipotential, so that the intermediate frequency signal is rapidly consumed, thereby separating the low frequency signal and the high frequency signal in the electromagnetic wave signal. It should be understood that the electromagnetic wave signal received by the first floating antenna arm 110 includes electromagnetic wave signals of various frequency bands, and the electromagnetic wave signals of various frequency bands can be divided according to actual needs. For example, in this embodiment, the intermediate frequency signal intercepted by the resonant circuit 120 is an electromagnetic wave signal with a frequency of 1700-2200 MHz, and the first frequency band antenna 150 can include a GPS L5 antenna with a working frequency of 1175-1177 MHz. The isolation device 130 is used to isolate the low frequency signal and the high frequency signal in the electromagnetic wave signal, and transmit the sub-low frequency signal in the electromagnetic wave signal to the π-type matching circuit 140.

[0053] It can be understood that the π-type matching circuit is used for signal compensation. After the electromagnetic wave signal is processed by the resonant circuit 120 and the isolation device 130, the signal strength corresponding to the sub-low frequency signal of the isolation device 130 is easily changed, so that the π-type matching circuit is needed to match and compensate the sub-frequency signal, thereby generating a compensation low frequency signal, and transmitting the compensation low frequency signal to the first frequency band antenna 150. After being processed by the first frequency band antenna 150, the compensation low frequency signal is transmitted to the equipotential for signal conversion.

[0054] Optionally, the resonance circuit 120 comprises a first capacitor 121 and a first inductor 122, a first end of the first capacitor 121 is a first end of the resonance circuit 120, a second end of the first capacitor 121 is connected with a first end of the first inductor 122, and a second end of the first inductor 122 is a second end of the resonance circuit 120.

[0055] The isolation device 130 is a second capacitor 131, and the π-type matching circuit 140 comprises a third capacitor 141, a second inductor 142 and a fourth capacitor 143.

[0056] A first end of the second capacitor 131 is connected with a first end of the first floating antenna arm 110, a second end of the second capacitor 131 is connected with a first end of the third capacitor 141 and a first end of the second inductor 142, and a second end of the third capacitor 141 is a third end of the π-type matching circuit 140.

[0057] A second end of the second inductor 142 is connected with a first end of the first frequency band antenna 150 and a first end of the fourth capacitor 143.

[0058] A second end of the fourth capacitor 143 is a fourth end of the π-type matching circuit 140, and a second end of the first frequency band antenna 150 is connected with an equipotential.

[0059] In the embodiment, the first capacitor 121 and the first inductor 122 are connected to form a series resonance circuit, the first capacitor 121 is connected with the first floating antenna arm 110, so as to receive the intermediate frequency signal in the electromagnetic wave signal, and the intercepted intermediate frequency signal is transmitted to the first inductor 122 and then to the equipotential for consumption.

[0060] The second capacitor 131 is used as the isolation device 130, and the capacitance of the second capacitor 131 is set to make the second capacitor 131 conduct the sub-low frequency signal, so as to isolate the low frequency signal and the high frequency signal. In the embodiment, the capacitance of the second capacitor 131 can be set to 1pF-1.5pF. The second capacitor 131 transmits the sub-low frequency signal to the π-type matching circuit 140.

[0061] The π-type matching circuit 140 can include a third capacitor 141, a second inductor 142, and a fourth capacitor 143, the second end of the third capacitor 141 being the third end of the π-type matching circuit 140, the second end of the fourth capacitor 143 being the fourth end of the π-type matching circuit 140, the first end of the third capacitor 141 and the first end of the second inductor 142 constituting the first end of the π-type matching circuit 140 and being connected to the second end of the second capacitor 131, and the second end of the second inductor 142 and the first end of the fourth capacitor 143 constituting the second end of the π-type matching circuit and being connected to the first end of the first frequency band antenna 150. The third capacitor 141, the second inductor 142, and the fourth capacitor 143 compensate for the secondary low-frequency signal, obtain a compensated low-frequency signal that the first frequency band antenna 150 can receive, and transmit the compensated low-frequency signal to the first frequency band antenna 150, thereby realizing signal transmission of the secondary low-frequency signal.

[0062] Optionally, the antenna isolation circuit further includes a fifth capacitor 160, the first end of the fifth capacitor 160 being connected to the second end of the first floating antenna arm 110, and the second end of the fifth capacitor 160 being grounded.

[0063] It can be understood that the fifth capacitor 160 is used to filter the ultrahigh-frequency electromagnetic wave signal, by setting a larger capacitance in the fifth capacitor 160 and making the fifth capacitor 160 conductive to ground, the fifth capacitor 160 can conduct the ultrahigh-frequency electromagnetic wave signal, thereby excluding the influence of the ultrahigh-frequency electromagnetic wave on signal transmission and human body radiation.

[0064] Optionally, the antenna isolation circuit further includes a second antenna arm 170, a second frequency band antenna 180, and a third frequency band antenna 190.

[0065] The first end of the second antenna arm 170 is opposite to the first end of the first floating antenna arm 110, and the second end of the second antenna arm 170 is opposite to the second end of the first floating antenna arm 110.

[0066] The first end of the second frequency band antenna 180 is connected to the second end of the second antenna arm 170, and the second end of the second frequency band antenna 180 is connected to the equipotential.

[0067] The first end of the third frequency band antenna 190 is connected to the first end of the second antenna arm 170, and the second end of the third frequency band antenna 190 is connected to the equipotential.

[0068] It can be understood that after the low-frequency signal and the high-frequency signal in the electromagnetic wave are isolated through the above embodiment, corresponding antennas need to be applied to receive the corresponding signals. In the present embodiment, the second antenna arm 170 is arranged, the first end of the second antenna arm 170 is opposite to the first end of the first floating antenna arm 110, and the third frequency band antenna 190 is arranged on the first end of the second antenna arm 170, which is used to receive the high-frequency signal on the first floating antenna arm. The second end of the second antenna arm 170 is opposite to the second end of the first floating antenna arm 110, and the second frequency band antenna 180 is arranged on the second end of the second antenna arm 170, which is used to receive the low-frequency signal on the first floating antenna arm 110. For example, the second frequency band antenna 180 can include a WIFI 2.4 antenna and a GPS L1 antenna, wherein the GPS L1 antenna is used to receive an electromagnetic wave signal with a frequency of about 1575.42 MHz, and the WIFI 2.4 antenna is used to receive an electromagnetic wave signal with a frequency of 2400 MHz-2430 MHz. The third frequency band antenna 190 can include an MHB antenna, which can include an LTE B1 antenna, an LTE B3 antenna, an LTE B7 antenna and an LTE B40 antenna, and the corresponding frequency ranges are 1920 MHz-1930 MHz, 1710 MHz-1785 MHz, 2500 MHz-2570 MHz and 2300 MHz-2400 MHz, respectively. The working frequency range of the WIFI 2.4 antenna in the second frequency band antenna 180 is close to the working frequency range of the third frequency band antenna 190, and interference is easily generated when they work simultaneously. By arranging the isolation point in the first frequency band antenna 150, the WIFI 2.4 antenna receives an electromagnetic wave signal higher than 2400 HMz, and the MHB antenna receives an electromagnetic wave signal lower than 2400 HMz.

[0069] Optionally, the antenna isolation circuit further comprises a fourth frequency band antenna 200 and a fifth frequency band antenna 210.

[0070] The first end of the fourth frequency band antenna 200 is connected with the third end of the second antenna arm 170, the third end is located within a preset distance near the first end of the second antenna arm 170, and the second end of the fourth frequency band antenna 200 is connected with the equipotential.

[0071] The first end of the fifth frequency band antenna 210 is connected with the fourth end of the second antenna arm 170, the fourth end is located within a preset distance near the second end of the second antenna arm 170, and the second end of the fifth frequency band antenna 210 is connected with the equipotential.

[0072] It can be understood that, in order to broaden the receiving frequency of the mobile terminal, enhance the signal quality and signal strength of the mobile terminal, the number of antennas needs to be increased within a certain range to ensure the signal strength of the mobile terminal. In the embodiment, the mobile terminal further includes a fourth frequency band antenna 200 and a fifth frequency band antenna 210. The fifth frequency band antenna 210 is connected to the fourth end of the second antenna arm 170, and the fourth end of the second antenna arm 170 is near the second end, for receiving high-frequency signals of higher frequencies. The fourth frequency band antenna 200 is connected to the third end of the second antenna arm 170, and the third end of the second antenna arm 170 is near the first end, for receiving high-frequency signals of higher frequencies. For example, the fifth frequency band antenna 210 can include an N78 / 79 antenna for receiving high-frequency signals of 3300HMz-3300HMz and 4400HMz-4900HMz, and the fourth frequency band antenna 200 can include a WIFI 6e antenna for receiving high-frequency signals of 5150HMz-7200HMz.

[0073] Through the above embodiment, the resonance circuit is connected in series in the connection circuit of the sub-low frequency antenna, the resonance frequency of the resonance circuit is set to the intermediate frequency, so that the intermediate frequency signal in the electromagnetic wave signal is quickly grounded at the sub-low frequency antenna side, and the isolation device is connected in series in the sub-low frequency antenna, the low frequency signal and the high frequency signal in the electromagnetic wave signal are isolated, the isolation degree between the high frequency antenna and the low frequency antenna in the antenna module is improved, the problem of reduced antenna efficiency and deteriorated performance caused by mutual interference between antennas is avoided, each antenna works independently of each other, and the signal quality and signal strength of each frequency band electromagnetic wave signal are improved.

[0074] Optionally, the present disclosure also provides an antenna isolation method, which can be applied to the above-mentioned antenna isolation circuit. The antenna isolation method comprises:

[0075] When the floating antenna arm receives the electromagnetic wave signal, the intermediate frequency signal in the electromagnetic wave signal is intercepted by the resonance circuit 120, and the intermediate frequency signal is transmitted to the equipotential;

[0076] The second capacitor 131 isolates the low frequency signal in the electromagnetic wave signal;

[0077] The second frequency band antenna 180 receives the low frequency signal sent by the first floating antenna arm 110, and transmits the low frequency signal to the equipotential;

[0078] The third frequency band antenna 190 receives the high frequency signal sent by the first floating antenna arm 110, and transmits the high frequency signal to the equipotential.

[0079] It can be understood that, through the resonance circuit 120, the intermediate frequency signal in the first floating antenna arm 110 is grounded and consumed, and through the second capacitor 131, the low frequency signal in the electromagnetic wave signal is isolated, so as to improve the isolation degree between the low frequency signal and the high frequency signal, and then the low frequency signal is transmitted to the second frequency band antenna 180 through the first floating antenna 110, and the high frequency signal is transmitted to the third frequency band antenna 190, so that the second frequency band antenna 180 and the third frequency band antenna 190 work independently of each other, thereby improving the signal quality and signal strength of the mobile terminal.

[0080] Optionally, the antenna isolation method further comprises:

[0081] The isolation device 130 transmits the sub-low frequency signal in the electromagnetic wave signal to the π-type matching circuit 140;

[0082] The π-type matching circuit 140 converts the sub-low frequency signal into a compensated low frequency signal, and transmits the compensated low frequency signal to the first frequency band antenna 150;

[0083] The first frequency band antenna 150 transmits the compensated low frequency signal to the equipotential.

[0084] It can be understood that the isolation device 130 is used to isolate the electromagnetic wave signal above the low frequency signal, and to conduct the sub-low frequency signal in the electromagnetic wave signal, which is transmitted to the π-type matching circuit 140, and the π-type matching circuit 140 is used to compensate the sub-low frequency signal, so as to obtain the compensated low frequency signal, and transmit the compensated low frequency signal to the first frequency band antenna 150, so as to realize the compensated transmission of the low frequency signal.

[0085] Optionally, the antenna isolation method further comprises:

[0086] The first end of the fourth frequency band antenna 200 is connected with the third end of the second antenna arm 170, and the third end is located within a preset distance near the first end, and the second end of the fourth frequency band antenna 200 is connected with the equipotential.

[0087] The first end of the fifth frequency band antenna 210 is connected with the fourth end of the second antenna arm 170, and the fourth end is located within a preset distance near the second end, and the second end of the fifth frequency band antenna 210 is connected with the equipotential.

[0088] It can be understood that, in order to improve the signal strength and signal quality of the mobile terminal, the fourth frequency band antenna 200 and the fifth frequency band antenna 210 can be added in the second antenna arm 170 for receiving the high frequency signal in the electromagnetic wave signal. In order to make the working state of the fourth frequency band antenna 200 and the fifth frequency band antenna 210 not affected by each other, the fourth frequency band antenna 200 and the fifth frequency band antenna 210 need to be arranged at the two ends of the second antenna arm 170 respectively, so as to improve the isolation degree between each other, and make the antenna performance of the mobile terminal more stable.

[0089] Figure 2 is a structural diagram of an antenna module according to an exemplary embodiment, which includes: a first floating antenna arm 110, a resonant circuit 120, a first capacitor 121, a first inductor 122, an isolation device 130, a second capacitor 131, a π-type matching circuit 140, a third capacitor 141, a second inductor 142, a fourth capacitor 143, a first frequency band antenna 150, a fifth capacitor 160, a second antenna arm 170, a second frequency band antenna 180, a third frequency band antenna 190, a fourth frequency band antenna 200, and a fifth frequency band antenna 210.

[0090] With regard to the apparatus in the above-described embodiments, in which the specific manner in which each module performs operations has been described in detail in the embodiments related to the method, no detailed elaboration will be made here.

[0091] Figure 3 is a block diagram of an electronic device 300 according to an exemplary embodiment. For example, the electronic device 300 can be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, etc.

[0092] Referring to Figure 3 , the electronic device 300 can include one or more of the following components: a processing component 302, a memory 304, a power supply component 306, a multimedia component 308, an audio component 310, an input / output (I / O) interface 312, a sensor component 314, and a communication component 316.

[0093] The processing component 302 usually controls overall operations of the electronic device 300, such as operations associated with displaying, making phone calls, data communications, camera operations, and recording operations. The processing component 302 can include one or more processors 320 to execute instructions to complete all or part of steps of the above-described antenna isolation method. In addition, the processing component 302 can include one or more modules to facilitate interaction between the processing component 302 and other components. For example, the processing component 302 can include a multimedia module to facilitate the interaction between the multimedia component 308 and the processing component 302.

[0094] The memory 304 is configured to store various types of data to support the operation of the electronic device 300. Examples of such data include instructions for any application or method operating on the electronic device 300, contact data, phonebook data, messages, pictures, videos, etc. The memory 304 can be implemented by any type of volatile or nonvolatile memory, 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 disc, or optical disc.

[0095] The power component 306 provides power to various components of the electronic device 300. The power component 306 can include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the electronic device 300.

[0096] The multimedia component 308 includes a screen providing an output interface between the electronic device 300 and a user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense a touch, a slide, and a gesture on the touch panel. The touch sensor can not only sense a boundary of a touching or a sliding action, but also detect duration and pressure related to the touching or sliding action. In some embodiments, the multimedia component 308 includes a front camera and / or a back camera. The front camera and / or the back camera can receive external multimedia data when the electronic device 300 is in an operation mode, such as a photographing mode or a video mode. Each of the front camera and the back camera can be a fixed optical lens system or have a focal length and optical zoom capability.

[0097] The audio component 310 is configured to output and / or input an audio signal. For example, the audio component 310 includes a microphone (MIC) configured to receive an external audio signal when the electronic device 300 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 304 or transmitted via the communication component 316. In some embodiments, the audio component 310 also includes a speaker for outputting an audio signal.

[0098] The I / O interface 312 provides an interface between the processing component 302 and peripheral interface modules, which can be a keypad, a click wheel, buttons, etc. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0099] The sensor component 314 includes one or more sensors to provide the electronic device 300 with state assessments of various aspects. For example, the sensor component 314 can detect an open / closed state of the electronic device 300, relative positioning of components, such as a display and a keypad of the electronic device 300, a change in position of the electronic device 300 or a component of the electronic device 300, presence or absence of user contact with the electronic device 300, orientation or acceleration / deceleration / g-force and temperature changes of the electronic device 300. The sensor component 314 can include an optical sensor for detecting ambient light, a proximity sensor for detecting nearby objects without any physical touch, a CMOS or CCD image sensor for use in imaging applications, or an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor in some embodiments.

[0100] The communication component 316 is configured to facilitate wired or wireless communication between the electronic device 300 and other devices. The electronic device 300 can access a wireless network based on a communication standard, such as WiFi, 2G, or 3G, or a combination thereof. In an example embodiment, the communication component 316 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an example embodiment, the communication component 316 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 technology.

[0101] In an example embodiment, the electronic device 300 can be implemented using 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, micro-controllers, microprocessors or other electronic elements, to perform the above-described antenna isolation method.

[0102] In an example embodiment, a non-transitory computer-readable storage medium including instructions, such as the memory 304 including instructions, is also provided, which can be executed by the processor 320 of the electronic device 300 to perform the above-described antenna isolation method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disc, and an optical data storage device, etc.

[0103] In another exemplary embodiment, there is also provided a computer program product comprising a computer program executable by a programmable device, the computer program having code portions for performing the above-described antenna isolation method when executed by the programmable device.

[0104] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the disclosure being indicated by the following claims.

[0105] It is to be understood that the disclosure is not limited to the precise construction described above and shown in the attached drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the disclosure is limited only by the claims that follow.

Claims

1. An antenna isolation circuit, characterized by Comprise: The first floating antenna arm, resonant circuit, isolation device, π type matching circuit and first frequency band antenna; The first end of the resonant circuit is connected with the first end of the first floating antenna arm, and the second end of the resonant circuit is connected with the equipotential, and the resonant circuit is used for intercepting the intermediate frequency signal in the electromagnetic wave signal received by the first floating antenna arm and transmitting the intermediate frequency signal to the equipotential; The first end of the isolation device is connected with the first end of the first floating antenna arm, and the second end of the isolation device is connected with the first end of the π type matching circuit, and the isolation device is used for isolating the low frequency signal and the high frequency signal in the electromagnetic wave signal and transmitting the sub low frequency signal in the electromagnetic wave signal to the π type matching circuit; The second end of the π type matching circuit is connected with the first frequency band antenna, the third end and the fourth end of the π type matching circuit are respectively connected with the equipotential, and the π type matching circuit is used for matching compensation of the sub low frequency signal, generating compensation low frequency signal, and transmitting the compensation low frequency signal to the first frequency band antenna; The first frequency band antenna is connected with the equipotential, and the first frequency band antenna is used for transmitting the compensation low frequency signal to the equipotential.

2. The antenna isolation circuit according to claim 1, wherein: The resonant circuit comprises a first capacitor and a first inductor, the first end of the first capacitor is the first end of the resonant circuit, the second end of the first capacitor is connected with the first end of the first inductor, and the second end of the first inductor is the second end of the resonant circuit; The isolation device is a second capacitor, and the π type matching circuit comprises a third capacitor, a second inductor and a fourth capacitor; The first end of the second capacitor is connected with the first end of the first floating antenna arm, the second end of the second capacitor is connected with the first end of the third capacitor and the first end of the second inductor, the second end of the third capacitor is the third end of the π type matching circuit; The second end of the second inductor is connected with the first end of the first frequency band antenna and the first end of the fourth capacitor; The second end of the fourth capacitor is the fourth end of the π type matching circuit, and the second end of the first frequency band antenna is connected with the equipotential.

3. The antenna isolation circuit of claim 1, wherein, Further comprise: The first end of the fifth capacitor is connected with the second end of the first floating antenna arm, and the second end of the fifth capacitor is grounded.

4. The antenna isolation circuit of claim 2, wherein, Further comprise: Second antenna arm, second frequency band antenna and third frequency band antenna; The first end of the second antenna arm is opposite to the first end of the first floating antenna arm, and the second end of the second antenna arm is opposite to the second end of the first floating antenna arm; The first end of the second frequency band antenna is connected with the second end of the second antenna arm, and the second end of the second frequency band antenna is connected with the equipotential; The first end of the third frequency band antenna is connected with the first end of the second antenna arm, and the second end of the third frequency band antenna is connected with the equipotential.

5. The antenna isolation circuit of claim 4, wherein, Further comprise: Fourth frequency band antenna and fifth frequency band antenna; The first end of the fourth frequency band antenna is connected with the third end of the second antenna arm, the third end of the second antenna arm is located within a preset distance near the first end of the second antenna arm, and the second end of the fourth frequency band antenna is connected with the equipotential. The first end of the fifth frequency band antenna is connected with the fourth end of the second antenna arm, the fourth end of the second antenna arm is located within a preset distance near the second end of the second antenna arm, and the second end of the fifth frequency band antenna is connected with the equipotential.

6. The antenna isolation circuit according to claim 5, wherein The first frequency band antenna comprises a GPS L5 antenna, the second frequency band antenna comprises a GPS L1 antenna and a WIFI 2.4 antenna, the third frequency band antenna comprises an MHB antenna, the fourth frequency band antenna comprises a WIFI 6e antenna, and the fifth frequency band antenna comprises an N78 and / or N79 antenna.

7. The antenna isolation circuit according to claim 4, wherein When the first floating antenna arm receives an electromagnetic wave signal, the resonant circuit is configured to intercept a medium frequency signal in the electromagnetic wave signal and transmit the medium frequency signal to the equipotential; The second capacitor is configured to isolate a low frequency signal and a high frequency signal in the electromagnetic wave signal; The second frequency band antenna is configured to receive the low frequency signal transmitted by the first floating antenna arm and transmit the low frequency signal to the equipotential; The third frequency band antenna is configured to receive the high frequency signal transmitted by the first floating antenna arm and transmit the high frequency signal to the equipotential.

8. An antenna module, characterized by An antenna module comprising the antenna isolation circuit according to any one of claims 1-7.

9. An electronic device, comprising: An antenna module comprising the antenna isolation circuit according to claim 8.

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