CN112737630A - Antenna circuit and electronic equipment - Google Patents
Antenna circuit and electronic equipment Download PDFInfo
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
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Abstract
The application discloses antenna circuit and electronic equipment relates to the technical field of communication. The antenna circuit includes: a wireless local area network integrated circuit, a first filter, a second filter and a first switch unit; the wireless local area network integrated circuit receives and transmits signals of a first frequency band and a second frequency band, and second harmonic radiation of the first frequency band generates interference on receiving and transmitting signals of a third frequency band of the cellular network; the first filter is connected with the first end of the wireless local area network integrated circuit, and the first end is a signal transceiving end of a first frequency band; the first switch unit is connected with a second end of the wireless local area network integrated circuit, and the second end is a signal transceiving end of a second frequency band; the first switch unit is connected with the second filter; the first switch unit comprises a first state and a second state, and the first state is used for conducting signal receiving and transmitting of the second frequency band; the second state is used for isolating signal transceiving of the second frequency band. The scheme of the application is used for solving the problem that the second harmonic of the Wi-Fi signal interferes with the signal receiving and transmitting of the cellular network.
Description
Technical Field
The application belongs to the technical field of communication, and particularly relates to an antenna circuit and an electronic device.
Background
With the development of economy and society, the demand for mobile communication is higher and higher, and the fifth generation mobile communication technology (abbreviated as 5G) is rapidly stepping into the commercial stage due to its higher communication rate, lower network delay and larger connection capacity. Compared with the 4G technology of the prior generation, 5G proposes a series of key technologies to support its stronger characteristics, such as a novel air interface technology, a large-scale antenna technology, a higher-frequency carrier, and the like.
In the process of implementing the present application, the inventor finds that at least the following problems exist in the prior art:
at present, the primary N77, N78, and N79 of the 5G frequency band of the operators in China mainly focus on the 3.3 GHz-5.0 GHz frequency band, and most of the signals causing serious interference are second harmonic/third harmonic, second order intermodulation/third order intermodulation, and the like generated by low frequency signals, wherein the second harmonic/third harmonic generated by the low frequency signals directly falls in the band of an NR (New Radio, New air interface) receiving frequency band, and the caused interference degree is particularly serious. For example: the second harmonic of Wi-Fi (Wireless Fidelity, Wireless local area network) 2.4G frequency band is about 4.8 GHz-4.96 GHz, and can directly fall in the frequency band range of 5G N79, thereby causing serious influence on the performance of N79 and even causing network cutoff.
Disclosure of Invention
An object of the embodiments of the present application is to provide an antenna circuit and an electronic device, which can solve the problem that second harmonics of Wi-Fi signals interfere with signal transmission and reception of a cellular network.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides an antenna circuit, including:
a wireless local area network integrated circuit, a first filter, a second filter and a first switch unit; wherein,
the wireless local area network integrated circuit receives and transmits signals of a first frequency band and signals of a second frequency band, the first frequency band and the second frequency band are different frequency bands, and second harmonic radiation of the first frequency band generates interference on receiving and transmitting signals of a third frequency band of the cellular network;
the first filter is connected with a first end of the wireless local area network integrated circuit, and the first end is a signal transceiving end of the first frequency band;
the first switch unit is connected with a second end of the wireless local area network integrated circuit, and the second end is a signal transceiving end of the second frequency band;
the first switch unit is also connected with the second filter;
the first switch unit comprises a first state and a second state, and the first state is used for conducting signal receiving and transmitting of the second frequency band; the second state is used for isolating the signal receiving and transmitting of the second frequency band.
In a second aspect, embodiments of the present application provide an electronic device comprising an antenna circuit as claimed in any one of the above.
Therefore, in the embodiment of the present application, under the condition that the second harmonic radiation of the first frequency band interferes with the signal transceiving of the third frequency band of the cellular network through the path of the second frequency band, the first switch unit switches to the second state to isolate the signal transceiving of the second frequency band, thereby preventing the second harmonic of the first frequency band from radiating through the path of the second frequency band, and reducing the influence of the second harmonic of the first frequency band signal on the signal transceiving of the third frequency band to a certain extent.
Drawings
Fig. 1 is a schematic structural diagram of an antenna circuit according to an embodiment of the present disclosure;
fig. 2 is a second schematic structural diagram of an antenna circuit according to an embodiment of the present application;
fig. 3 is a flowchart illustrating a software coexistence algorithm controlling a switching state of a first switch unit according to an embodiment of the present application;
fig. 4 is a flowchart illustrating a software coexistence algorithm controlling switching states of a first switch unit and a second switch unit according to an embodiment of the present application;
fig. 5 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application.
Description of reference numerals:
1-a wireless local area network integrated circuit; 2-a first filter; 3-a second filter; 4-a first switching unit; 5-a combiner; 6-a second switching unit; 7-a first resistance; 8-a second resistance; 9-wireless local area network antenna assembly.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
In order to solve the problem that the second harmonic of Wi-Fi2.4G interferes with a signal of a 5G N79 frequency band, in the prior art, a filter is added on a radio frequency path of the Wi-Fi2.4G, and the second harmonic of the Wi-Fi2.4G is suppressed to be within an acceptable range. However, the technology has the defects that only the second harmonic leaked from the radio frequency path of Wi-Fi2.4G can be suppressed, the isolation degree inside the chip is not enough for a dual-frequency Wi-Fi chip platform, the second harmonic of Wi-Fi2.4G can be coupled to the radio frequency path of Wi-Fi 5G from the inside of the chip, and the frequency band of the second harmonic of Wi-Fi2.4G is very close to 5GHz, so that the suppression degree of the second harmonic of Wi-Fi2.4G by a 5G Wi-Fi filter arranged on the radio frequency path of Wi-Fi 5G is very low, the second harmonic of Wi-Fi2.4G can be radiated from Wi-Fi 5G days through the radio frequency path of Wi-Fi 5G, and the signal of the frequency band of 5G N79 can be seriously affected.
The antenna circuit provided by the embodiment of the present application is described in detail with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
As shown in fig. 1, an embodiment of the present application provides an antenna circuit, including:
a wireless local area network integrated circuit 1, a first filter 2, a second filter 3, and a first switch unit 4; wherein,
the wireless local area network integrated circuit 1 receives and transmits signals of a first frequency band and signals of a second frequency band, the first frequency band and the second frequency band are different frequency bands, and second harmonic radiation of the first frequency band generates interference on receiving and transmitting signals of a third frequency band of a cellular network;
the first filter 2 is connected to a first end of the wireless lan integrated circuit 1, where the first end is a signal transceiving end of the first frequency band;
the first switch unit 4 is connected to a second end of the wireless lan integrated circuit 1, where the second end is a signal transceiver end of the second frequency band;
the first switching unit 4 is also connected to the second filter 3;
the first switch unit 4 includes a first state and a second state, and the first state is used for conducting signal transceiving of the second frequency band; the second state is used for isolating the signal receiving and transmitting of the second frequency band.
Therefore, under the condition that the second harmonic radiation of the first frequency band interferes with the signal receiving and transmitting of the third frequency band of the cellular network through the path of the second frequency band, the first switch unit is switched to the second state to isolate the signal receiving and transmitting of the second frequency band, so that the second harmonic radiation of the first frequency band through the path of the second frequency band is prevented, and the influence of the second harmonic radiation of the first frequency band on the signal receiving and transmitting of the third frequency band is reduced to a certain extent.
In the embodiment of the present application, a signal in the first frequency band is a signal in a Wi-Fi2.4G frequency band, a signal in the second frequency band is a signal in a Wi-Fi 5G frequency band, and a signal in the third frequency band is a signal in a 5G N79 frequency band.
The second harmonic radiation of Wi-Fi2.4G band signals interferes with the cellular network's 5G N79 band signal transmission and reception.
According to the embodiment of the application, the first switch unit 4 is arranged on the signal path of the Wi-Fi 5G frequency band, and the algorithm of software coexistence is adopted to ensure that the signal path of the Wi-Fi2.4G frequency band is disconnected through the first switch unit 4 when the signal is transmitted and received, so that the second harmonic of the signal of the Wi-Fi2.4G frequency band is prevented from radiating out through the signal path of the Wi-Fi 5G frequency band, the algorithm of software coexistence can ensure that various scenes under the condition that Wi-Fi and 5G NR coexist do not influence each other, and the logic of the first switch unit 4 is ensured not to be wrong.
The software coexistence algorithm switches the first state and the second state of the first switch unit 4 in the coexistence state of the Wi-Fi2.4G frequency band, the Wi-Fi 5G frequency band and the 5G N79 frequency band, so that the interference of the second harmonic of the Wi-Fi2.4G frequency band signals on the signals of the 5G N79 frequency band through the signal path of the Wi-Fi 5G frequency band can be reduced under the condition that the cellular network and the Wi-Fi function are not influenced. The detected working states of the cellular network and the Wi-Fi can be fed back to a Wireless local area network Integrated Circuit (Wi-Fi IC)1 through a General Purpose Input Output (GPIO) port and can be processed in a centralized way through the Wireless local area network Integrated Circuit 1. Optionally, the detected working states of the cellular network and the Wi-Fi can also be fed back to a Central Processing Unit (CPU) through a GPIO port, and then the CPU controls the Wi-Fi IC 1 to perform centralized Processing. For example, if a signal in the 5G N79 frequency band is in a Transmit (TX) state, the N79 frequency band transmit port (GPIO _ N79_ core _ TX) in the GPIO port will feed back a high level to the Wi-Fi IC 1 or the CPU, and the signal of the Wi-Fi will also be fed back to the Wi-Fi IC 1 or the CPU through the GPIO port according to the same principle.
It should be noted that, by using the software coexistence algorithm, when it is detected that the Wi-Fi2.4G frequency band is in the operating state, the first switch unit 4 is controlled to switch to the second state, and the isolation of the signal path of the Wi-Fi 5G frequency band is increased, so that the second harmonic of the Wi-Fi2.4G frequency band signal is prevented from being radiated out through the signal path of the Wi-Fi 5G frequency band, but considering that when the 5G N79 frequency band is in the transmitting state, the situation that the Wi-Fi 5G antenna is damaged due to excessively high injection power of the signal may occur, therefore, the software coexistence algorithm controls the first switch unit 4 to switch to the first state, and the antenna can be prevented from being damaged due to excessively high signal power coupled to the Wi-Fi 5G antenna.
It should be noted that the first filter 2 is a filter disposed on a signal path of a Wi-Fi2.4G band, and the second filter 3 is a filter disposed on a signal path of a Wi-Fi 5G band.
In a case that the second harmonic radiation in the first frequency band interferes with the signal transceiving of the third frequency band of the cellular network through the path in the second frequency band, optionally, as shown in fig. 2, the antenna circuit further includes:
a combiner 5 and a second switching unit 6; wherein,
the second switch unit 6 is disposed between the combiner 5 and the second filter 3, the second switch unit 6 includes a third state and a fourth state, and the second filter 3 is electrically conducted to the combiner 5 through the second switch unit 6 in the third state of the second switch unit 6; in the fourth state of the second switching unit 6, the second filter 3 is disconnected from the combiner 5.
Optionally, the second switching unit 6 comprises a plurality of series-connected sub-switches.
Thus, the isolation of signal transmission can be further improved by the series connection of the plurality of sub-switches. The number of the sub-switches in the second switch unit is set according to a preset requirement, and is not limited in the embodiment of the present application.
Wherein the third state of the second switch unit 6, i.e. the plurality of sub-switches are electrically conducted, and electrically conducted at the combiner 5; the fourth state of the second switch unit 6, i.e. the plurality of sub-switches are open and open at the combiner 5. Referring to fig. 2, in the embodiment of the present application, since the isolation of the first switch unit 4 to the signal is low, and the energy of the second harmonic of the Wi-Fi2.4G band signal may not be reduced to the preset requirement, the second switch unit 6 including a plurality of serially connected sub-switches may be disposed between the second filter 3 and the combiner 5 on the signal path of the Wi-Fi 5G band, so as to increase the isolation to the second harmonic of the Wi-Fi2.4G band signal, so as to achieve the preset isolation.
When the second switch unit 6 is switched to the fourth state, the energy of the radio frequency signal is not completely isolated, the energy is still transmitted to the first sub-switch of the second switch unit 6 and transmitted to the second sub-switch through the first sub-switch, but the energy is attenuated, and the attenuation degree is equal to the isolation degree of the switch, so that the attenuation degree can be obviously improved by the plurality of sub-switches connected in series, and the energy of the second harmonic of the Wi-Fi2.4G frequency band signal is reduced to a preset requirement.
It should be noted that, in the embodiment of the present application, the second switch unit including the plurality of serially connected sub-switches is used to implement isolation, so as to meet requirements of different hardware designs well, improve isolation flexibly, and effectively prevent the second harmonic of the Wi-Fi2.4G band signal from radiating and interfering with the signal in the 5G N79 band through the signal path in the Wi-Fi 5G band.
The combiner 5 is configured to combine the signals of the multiple frequency bands and output the combined signals.
In the embodiment of the application, the software switches the first state and the second state of the first switch unit 4 and switches the third state and the fourth state of the second switch unit 6 according to the coexisting state of the Wi-Fi2.4G frequency band, the Wi-Fi 5G frequency band and the 5G N79 frequency band, so that the second harmonic of the Wi-Fi2.4G frequency band signal can be reduced from radiating and interfering with the signal in the 5G N79 frequency band through the signal path in the Wi-Fi 5G frequency band under the condition that the cellular network and the Wi-Fi function are not affected. The detected working states of the cellular network and the Wi-Fi can be fed back to the Wi-Fi IC 1 or the CPU through the GPIO port and are processed by the Wi-Fi IC 1 in a centralized mode.
It should be noted that, by using a software coexistence algorithm, the GPIO port shared by the sub-switches of the second switch unit 6 is logically controlled, so as to achieve an effect of controlling the states of the plurality of sub-switches to be identical, and by using the software coexistence algorithm, when the first switch unit 4 is controlled to be in the first state (the state of conducting the signal transceiving of the second frequency band), the second switch unit 6 is controlled to be in the third state (the state of conducting the signal transceiving of the second frequency band), and when the first switch unit 4 is controlled to be in the second state (the state of isolating the signal transceiving of the second frequency band), the second switch unit 6 is controlled to be in the fourth state (the state of isolating the signal transceiving of the second frequency band).
It should be noted that, when detecting that the Wi-Fi2.4G frequency band is in the working state, the software coexistence algorithm controls the first switch unit 4 to switch to the second state, and controls the second switch unit 6 to switch to the fourth state, increases the isolation of the signal path of the Wi-Fi 5G frequency band, thereby achieving the purpose of preventing the second harmonic of the Wi-Fi2.4G frequency band signal from radiating out through the signal path of the Wi-Fi 5G frequency band, but considering that when the 5G N79 frequency band is in a transmitting state, the situation that the Wi-Fi 5G antenna is damaged due to the fact that the injection power of the signal is too large can occur, thus, the software coexistence algorithm controls the first switching unit 4 to switch to the first state, the second switching unit 6 to switch to the third state all together, the antenna can be prevented from being damaged by excessive signal power coupled to the Wi-Fi 5G antenna.
Optionally, the first switch unit 4 is a single-ended multi-throw switch.
In the embodiment of the present application, the first switch unit 4 is a single-ended multi-throw switch, and the first state and the second state of the first switch unit 4 can be switched by connecting the stationary end of the first switch unit 4 to different moving ends.
Optionally, in the embodiment of the present application, the first switch unit 4 is a single-ended three-throw switch (SP 3T). At this time, the first moving end of the first switch unit 4 is connected to a transmitting port of the Wi-Fi 5G band signal, the second moving end of the first switch unit 4 is connected to a receiving port of the Wi-Fi 5G band signal, and the third moving end of the first switch unit 4 is connected to the grounded first resistor 7. When the stationary end of the first switch unit 4 is connected with the first movable end or the second movable end, the first switch unit 4 is in a first state; when the stationary end of the first switch unit 4 is connected to the third movable end, the first switch unit 4 is in the second state.
Optionally, in this embodiment of the application, the first switch unit 4 is a single-ended double-throw switch, and at this time, the first moving end of the first switch unit 4 is connected to a transmitting port of the Wi-Fi 5G band signal, and the second moving end of the first switch unit 4 is connected to a receiving port of the Wi-Fi 5G band signal. When the stationary end of the first switch unit 4 is connected with the first movable end or the second movable end, the first switch unit 4 is in a first state; when the stationary end of the first switch unit 4 is idle, that is, the stationary end of the first switch unit 4 is connected to the first moving end or the second moving end is not connected, the first switch unit 4 is in the second state.
Optionally, one end of the first switch unit 4 is connected to a first resistor 7 connected to ground.
It should be noted that, because the Wi-Fi2.4G frequency band is in the operating state, the Wi-Fi 5G frequency band is in the off state, and the Wi-Fi 5G frequency band is in the operating state, the Wi-Fi2.4G frequency band is in the off state, when it is detected that the Wi-Fi2.4G frequency band is in the operating state, the first switch unit 4 is controlled to switch to the second state where the stationary end of the first switch unit 4 is connected to the third movable end, that is, connected to the first resistor 7, so as to isolate the second harmonic of the Wi-Fi2.4G frequency band signal from radiating the signal of the interference 5G N79 frequency band through the signal path of the Wi-Fi 5G frequency band.
Alternatively, the resistance value of the first resistor 7 is 50 Ω.
The following describes the process of controlling the switching state of the first switch unit by the software coexistence algorithm with reference to fig. 3 and table 1:
firstly, detecting working states of a Wi-Fi frequency band and a 5G NR frequency band, if detecting that a signal of a 5G N79 frequency band is in a transmitting state (5G N79 TX), detecting whether a signal of a Wi-Fi2.4G frequency band is in a closed state (Wi-Fi 2.4G OFF), if detecting that the signal of the Wi-Fi2.4G frequency band is not in the closed state, namely in the working state, controlling a stationary end of a first switch unit (SW1) to be switched to a passage connected with a first resistor (50 omega), isolating second harmonic of the signal of the Wi-Fi2.4G frequency band from radiating and interfering the signal of a 5G N79 frequency band through the signal passage of the Wi-Fi 5G frequency band, and if detecting that the signal of the Wi-Fi2.4G frequency band is in the closed state, detecting whether the signal of the Wi-Fi 5G frequency band is in the transmitting state (Wi-Fi 5G TX), it should be noted that, no matter whether the Wi-Fi 5G band signal is in a transmitting state, the fixed end of the first switch unit (SW1) is controlled to be switched to be connected to the first movable end, that is, to a Transmitting (TX) path of the band signal, and different from the above, when the Wi-Fi 5G band signal is detected not to be in the transmitting state, the situation that the Wi-Fi 5G antenna (LNA) is damaged due to excessive injected power because the 5G N79 band signal is in the transmitting state is considered, and the purpose of protecting the Wi-Fi 5G LNA is achieved by controlling the first switch unit (SW1) to be switched to the Transmitting (TX) path of the band signal to prevent the LNA from being damaged due to excessive power of the Wi-Fi 5G LNA. Under the condition that a signal of a 5G N79 frequency band is detected not to be in a transmitting state (5G N79 TX), whether a signal of a Wi-Fi2.4G frequency band is in a closed state (Wi-Fi 2.4G OFF) or not is detected, if the signal of the Wi-Fi2.4G frequency band is detected not to be in the closed state, namely in an operating state, a stationary end of a first switch unit (SW1) is controlled to be switched to a passage connected with a first resistor (50 omega), second harmonic of the signal of the Wi-Fi2.4G frequency band is isolated, the signal of a 5G N79 frequency band is radiated and interfered by the signal passage of the Wi-Fi 5G frequency band, and if the signal of the Wi-Fi2.4G frequency band is detected to be in the closed state, whether the signal of the Wi-Fi 5G frequency band is detected to be in the, if the signal of the Wi-Fi 5G frequency band is detected to be in a transmitting state, the first switch unit (SW1) is controlled to be switched to a Transmitting (TX) path of the frequency band signal, and if the signal of the Wi-Fi 5G frequency band is detected not to be in the transmitting state, the stationary end of the first switch unit (SW1) is controlled to be switched to be connected with the second movable end, namely, to be switched to a Receiving (RX) path of the frequency band signal.
The logic control table for controlling the first switch unit by the software coexistence algorithm is shown in table 1:
TABLE 1 logical control Table of software coexistence Algorithm
Optionally, the sub-switches of the second switch unit 6 are single-ended multi-throw switches.
In this embodiment, the sub-switches of the second switch unit 6 are single-ended multi-throw switches, and the third state and the fourth state of the second switch unit 6 can be switched by connecting the fixed terminals of the sub-switches to different movable terminals.
Optionally, in this embodiment, the sub-switches of the second switch unit 6 are single-ended double-throw switches. When the stationary end of each sub-switch is connected with the first movable end, the second switch unit 6 is in a third state, namely, a conducting state; when the stationary end of each sub-switch is connected to the second moving end, the second switch unit 6 is in the fourth state, i.e., the isolated state.
It should be noted that, assuming that the first switch unit 4 is a single-ended double-throw switch, as shown in fig. 2, when the stationary end of the first switch unit 4 is connected to the first movable end of the first switch unit 4 or the stationary end of the first switch unit 4 is connected to the second movable end of the first switch unit 4, correspondingly, the stationary end of the sub-switch of the second switch unit 6 is connected to the first movable end of the next sub-switch, and certainly, if the sub-switch is used as the last sub-switch, the stationary end thereof is connected to the combiner 5 and is in a conducting state; when the stationary end of the first switch unit 4 is idle, the stationary end of each sub-switch of the second switch unit 6 is connected with the second movable end of the sub-switch correspondingly, and is in an isolated state.
Optionally, one end of the sub-switch of the second switch unit 6 is connected to the second resistor 8 connected to ground.
In this embodiment of the application, the second moving end of each sub-switch of the second switch unit 6 is connected to the second resistor 8, and when the Wi-Fi2.4G frequency band is in the operating state, the second switch unit 6 is controlled to switch to the fourth state, that is, each sub-switch is connected to the second resistor 8, so as to isolate the second harmonic of the Wi-Fi2.4G frequency band signal from radiating the signal in the interference 5G N79 frequency band through the signal path in the Wi-Fi 5G frequency band.
Optionally, the resistance of the second resistor 8 is 50 Ω.
The following describes the process of controlling the switching state of the first switch unit by the software coexistence algorithm with reference to fig. 4 and table 2:
firstly, detecting working states of Wi-Fi signals and a 5G NR frequency band, if detecting that signals of a 5G N79 frequency band are in a transmitting state (5G N79 TX), detecting whether signals of a Wi-Fi2.4G frequency band are in a closing state (Wi-Fi 2.4G OFF), if detecting that signals of a Wi-Fi2.4G frequency band are not in a closing state, namely in a working state, controlling a stationary end of a first switch unit (SW1) to be switched to a passage connected with a first resistor (50 omega) (in an isolating state), correspondingly, all sub-switches (SW 2-SW) of a second switch unit are switched to a passage connected with a second resistor (50 omega), and isolating second harmonics of the signals of the Wi-Fi2.4G frequency band to radiate signals of a 5G N79 frequency band through the signal passages of the Fi-5G frequency band, if the Wi-Fi2.4G band signal is detected to be in the off state, whether the Wi-Fi 5G band signal is in the transmission state (Wi-Fi 5G TX) is detected, but it should be noted that whether the Wi-Fi 5G band signal is in the transmission state or not, the stationary terminal of the first switch unit (SW1) is controlled to be switched to be connected to the first movable terminal, that is, to be switched to the Transmission (TX) path of the band signal, and correspondingly, all the sub-switches (SW 2-SW) of the second switch unit are switched to the ON state (ON state), except that when the Wi-Fi 5G band signal is detected not to be in the transmission state, the situation that the Wi-Fi 5G antenna (LNA) is damaged due to the fact that the injected power is too high when the 5G N79 band signal is in the transmission state is considered, by controlling the first switch unit (SW1) to be switched to a Transmitting (TX) path of the frequency band signal, all the sub-switches (SW 2-SW) of the second switch unit are switched to be in a conducting state (ON state), the LNA is prevented from being damaged due to the fact that Wi-Fi 5G LNA power is too large, and the purpose of protecting the Wi-Fi 5G LNA is achieved. Under the condition that a signal of a 5G N79 frequency band is detected not to be in a transmitting state (5G N79 TX), whether a signal of a Wi-Fi2.4G frequency band is in a closed state (Wi-Fi 2.4G OFF) or not is detected, if the signal of the Wi-Fi2.4G frequency band is detected not to be in the closed state, namely in an operating state, the stationary end of the first switch unit (SW1) is controlled to be switched to a channel (an isolation state) connected with a first resistor (50 omega), correspondingly, all sub switches (SW 2-SW) of the second switch unit are switched to a channel connected with a second resistor (50 omega), and the second harmonic of the signal of the isolated Fi2.4G frequency band radiates a signal of a 5G N79 frequency band through the signal channel of the Wi-Fi 5G frequency band, if the signal of the Wi-Fi2.4G frequency band is detected to be in the closed state, whether the signal of the Wi-Fi 5G frequency band is in the transmitting state (Wi-Fi 5G TX) is detected, if the signal of the Wi-Fi 5G frequency band is detected to be in the transmitting state, the first switching unit (SW1) is controlled to switch to the Transmit (TX) path of the band signal, correspondingly, all the sub-switches (SW 2-SW) of the second switch unit are switched to a conducting state (ON state), if the Wi-Fi 5G frequency band signal is detected not to be in a transmitting state, the stationary end of the first switch unit (SW1) is controlled to be switched to be connected with the second movable end, i.e. to the Reception (RX) path of the band signal, and correspondingly, the respective sub-switches (SW 2-SW) of the second switching unit are all switched to the ON state (ON state).
The logic control table for controlling the first switch unit and the second switch unit by the software coexistence algorithm is shown in table 2:
table 2 logic control table for controlling first and second switching units by software coexistence algorithm
It should be noted that, the first switch unit and the second switch unit of different types are used in different matching manners, so that the isolation of the Wi-Fi 5G band signal path can be flexibly and effectively improved, and the second harmonic radiation of the Wi-Fi2.4G band signal is prevented from interfering with the 5G N79 band signal, which is also within the protection scope of the embodiment of the present application.
Optionally, the antenna circuit further comprises:
the wireless local area network antenna assembly 9, the second switch unit 6 and the first filter 2 are connected with the wireless local area network antenna assembly 9 through the combiner 5.
In the embodiment of the present application, the combiner 5 is configured to combine the signals of multiple frequency bands and output the combined signals to the wlan antenna assembly 9.
Embodiments of the present application also provide an electronic device including the antenna circuit as described in any of the above.
It should be noted that, the electronic device provided in this embodiment of the application includes the above-mentioned antenna circuit, and in a case where second harmonic radiation in the first frequency band interferes with signal transceiving in the third frequency band of the cellular network through the second frequency band, the first switch unit switches to the second state to isolate signal transceiving in the second frequency band, so as to prevent second harmonic radiation in the first frequency band from passing through the second frequency band, and reduce the influence of second harmonic radiation in the first frequency band on signal transceiving in the third frequency band to a certain extent.
It should be noted that, the electronic device provided in the embodiments of the present application includes the above-mentioned antenna circuit, and all embodiments of the above-mentioned antenna circuit are applicable to the apparatus, and can achieve the same or similar beneficial effects.
Optionally, the electronic device further comprises:
and the cellular network antenna circuit receives and transmits signals of a third frequency band.
Fig. 5 is a schematic diagram of a hardware structure of an electronic device implementing various embodiments of the present application.
The electronic device 500 includes, but is not limited to: a radio frequency unit 501, a network module 502, an audio output unit 503, an input unit 504, a sensor 505, a display unit 506, a user input unit 507, an interface unit 508, a memory 509, a processor 510, and the like. The electronic device further comprises an antenna circuit as shown in fig. 1 or fig. 2.
Those skilled in the art will appreciate that the electronic device 500 may further include a power supply (e.g., a battery) for supplying power to various components, and the power supply may be logically connected to the processor 510 via a power management system, so as to implement functions of managing charging, discharging, and power consumption via the power management system. The electronic device structure shown in fig. 5 does not constitute a limitation of the electronic device, and the electronic device may include more or less components than those shown, or combine some components, or arrange different components, and thus, the description is omitted here.
It can be seen that, in the electronic device 500, when the second harmonic radiation of the first frequency band interferes with the signal transceiving of the third frequency band of the cellular network through the path of the second frequency band, the first switch unit switches to the second state to isolate the signal transceiving of the second frequency band, thereby preventing the second harmonic radiation of the first frequency band from going out through the path of the second frequency band, and reducing the influence of the second harmonic radiation of the first frequency band on the signal transceiving of the third frequency band to a certain extent.
It should be understood that in the embodiment of the present application, the input Unit 504 may include a Graphics Processing Unit (GPU) 5041 and a microphone 5042, and the Graphics processor 5041 processes image data of still pictures or videos obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 506 may include a display panel 5061, and the display panel 5061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 507 includes a touch panel 5071 and other input devices 5072. A touch panel 5071, also referred to as a touch screen. The touch panel 5071 may include two parts of a touch detection device and a touch controller. Other input devices 5072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in further detail herein. The memory 509 may be used to store software programs as well as various data including, but not limited to, application programs and operating systems. Processor 510 may integrate an application processor, which primarily handles operating systems, user interfaces, applications, etc., and a modem processor, which primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into processor 510.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An antenna circuit, comprising:
a wireless local area network integrated circuit (1), a first filter (2), a second filter (3) and a first switching unit (4); wherein,
the wireless local area network integrated circuit (1) receives and transmits signals of a first frequency band and signals of a second frequency band, the first frequency band and the second frequency band are different frequency bands, and second harmonic radiation of the first frequency band generates interference on receiving and transmitting signals of a third frequency band of a cellular network;
the first filter (2) is connected with a first end of the wireless local area network integrated circuit (1), and the first end is a signal transceiving end of the first frequency band;
the first switch unit (4) is connected with a second end of the wireless local area network integrated circuit (1), and the second end is a signal transceiving end of the second frequency band;
the first switching unit (4) is also connected with the second filter (3);
the first switch unit (4) comprises a first state and a second state, and the first state is used for conducting signal transceiving of the second frequency band; the second state is used for isolating the signal receiving and transmitting of the second frequency band.
2. The antenna circuit of claim 1, further comprising:
a combiner (5) and a second switch unit (6); wherein,
the second switch unit (6) is arranged between the combiner (5) and the second filter (3), the second switch unit (6) comprises a third state and a fourth state, and the second filter (3) is electrically conducted with the combiner (5) through the second switch unit (6) when the second switch unit (6) is in the third state; when the second switching unit (6) is in the fourth state, the second filter (3) is disconnected from the combiner (5).
3. The antenna circuit according to claim 2, characterized in that the second switching unit (6) comprises a plurality of series-connected sub-switches.
4. The antenna circuit according to claim 1, characterized in that the first switching unit (4) is a single-ended multi-throw switch.
5. The antenna circuit according to claim 1 or 4, characterized in that one end of the first switching element (4) is connected to a first resistor (7) connected to ground.
6. The antenna circuit according to claim 2, characterized in that the sub-switches of the second switching unit (6) are single-ended multi-throw switches.
7. The antenna circuit according to claim 2 or 6, characterized in that one end of the subswitch of the second switching unit (6) is connected to a second resistor (8) connected to ground.
8. The antenna circuit of claim 2, further comprising:
a wireless local area network antenna assembly (9), the second switching unit (6) and the first filter (2) being connected to the wireless local area network antenna assembly (9) via the combiner (5).
9. An electronic device, characterized in that it comprises an antenna circuit according to any one of claims 1 to 8.
10. The electronic device of claim 9, further comprising:
and the cellular network antenna circuit receives and transmits signals of a third frequency band.
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| CN105897280A (en) * | 2016-04-08 | 2016-08-24 | 广东欧珀移动通信有限公司 | Antenna tuning circuit and mobile terminal |
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