CN215601302U - Radio frequency circuit and electronic device - Google Patents
Radio frequency circuit and electronic device Download PDFInfo
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- CN215601302U CN215601302U CN202121305869.9U CN202121305869U CN215601302U CN 215601302 U CN215601302 U CN 215601302U CN 202121305869 U CN202121305869 U CN 202121305869U CN 215601302 U CN215601302 U CN 215601302U
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Abstract
The application discloses radio frequency circuit and electronic equipment belongs to the technical field of communication. The radio frequency circuit includes: a power amplification module; the transmitting end of the first duplexer is connected with the first end of the power amplification module, and the receiving end of the first duplexer is connected with the second end of the power amplification module through a first selector switch; the transmitting end of the second duplexer is connected with the third end of the power amplification module; the antenna is connected with the third end of the first duplexer and connected with the second end of the second duplexer; the first duplexer and the second duplexer respectively work in different frequency bands, a receiving end of the first duplexer and a transmitting end of the second duplexer can supplement the transmitted signals of the uplink SUL frequency band through the same target, and the suppression degree of the receiving end of the first duplexer on the harmonic interference of the target SUL frequency band is greater than that of the transmitting end of the second duplexer on the harmonic interference of the target SUL frequency band.
Description
Technical Field
The application belongs to the technical field of communication, and particularly relates to a radio frequency circuit and electronic equipment.
Background
In 5G communication technology, Uplink coverage is generally inferior to downlink coverage, and in the rel.15 standard of the third Generation Partnership Project (3 GPP), an Uplink enhancement technology, i.e., Supplemental Uplink (SUL), which is generally a low frequency band, is newly added to ensure Uplink coverage. A plurality of different frequency bands such as N5, N8, N81, N82, N77 and N78 are defined in a 3GPP standard organization, wherein the N81 and N82 frequency bands both belong to an SUL frequency band, and the transmitting frequencies of the N81 and N8 frequency bands are the same and are 880-915 MHz, so that when the N78 and SUL combined framework is adopted, the N81 SUL frequency band can realize signal transmission by multiplexing the transmitting TX channel of the N8 frequency band.
However, when the signal of the N81 frequency band is transmitted, the generated fourth harmonic (3520-3660 MHz) just falls within the N78 frequency band (3300-3800 MHz), which causes interference to the RX signal received in the N78 frequency band, and the transmitting end of the N8 duplexer has a low suppression degree for the fourth harmonic, and cannot effectively suppress the harmonic interference generated in the N81 frequency band.
SUMMERY OF THE UTILITY MODEL
An object of the embodiments of the present application is to provide a radio frequency circuit and an electronic device, which can solve the problem that, when an SUL frequency band in the related art multiplexes a certain frequency band signal path, the path cannot effectively suppress harmonic interference generated by the SUL frequency band.
In a first aspect, an embodiment of the present application provides a radio frequency circuit, including:
a power amplification module;
a transmitting end of the first duplexer is connected with a first end of the power amplification module, a receiving end of the first duplexer is connected with a second end of the power amplification module through a first switch, the receiving end of the first duplexer is connected with a fixed end of the first switch, a first movable end of the first switch is connected with a second end of the power amplification module, and a second movable end of the first switch is connected with a receiving module;
a transmitting end of the second duplexer is connected with a third end of the power amplification module;
an antenna connected to a third terminal of the first duplexer and to a second terminal of the second duplexer;
the first duplexer and the second duplexer respectively work in different frequency bands, the receiving end of the first duplexer and the transmitting end of the second duplexer can supplement the transmitting signals of the uplink SUL frequency band through the same target, the suppression degree of the harmonic interference of the target SUL frequency band by the receiving end of the first duplexer is greater than that of the harmonic interference of the target SUL frequency band by the transmitting end of the second duplexer, and under the condition that the transmitting power of the target SUL frequency band is greater than or equal to first preset power, the transmitting signals of the target SUL frequency band pass through the receiving end of the first duplexer and are transmitted through the first duplexer and the antenna.
In a second aspect, an embodiment of the present application provides an electronic device, including the radio frequency circuit described in the first aspect.
In an embodiment of the present application, a radio frequency circuit includes: a power amplification module; a transmitting end of the first duplexer is connected with a first end of the power amplification module, a receiving end of the first duplexer is connected with a second end of the power amplification module through a first switch, the receiving end of the first duplexer is connected with a fixed end of the first switch, a first movable end of the first switch is connected with a second end of the power amplification module, and a second movable end of the first switch is connected with a receiving module; a transmitting end of the second duplexer is connected with a third end of the power amplification module; an antenna connected to a third terminal of the first duplexer and to a second terminal of the second duplexer; the first duplexer and the second duplexer respectively work in different frequency bands, the receiving end of the first duplexer and the transmitting end of the second duplexer can supplement the transmitting signals of the uplink SUL frequency band through the same target, the suppression degree of the harmonic interference of the target SUL frequency band by the receiving end of the first duplexer is greater than that of the harmonic interference of the target SUL frequency band by the transmitting end of the second duplexer, and under the condition that the transmitting power of the target SUL frequency band is greater than or equal to first preset power, the transmitting signals of the target SUL frequency band pass through the receiving end of the first duplexer and are transmitted through the first duplexer and the antenna. Thus, by multiplexing the target SUL band with a signal path of a band having a high suppression degree of harmonic interference in the SUL band, it is possible to ensure that harmonic interference generated in the SUL band is suppressed more effectively.
Drawings
Fig. 1a is a schematic diagram illustrating a difference between uplink coverage and downlink coverage in a 5G network according to an embodiment of the present application;
fig. 1b is a schematic diagram of an NR frequency band uplink coverage area and an SUL frequency band uplink coverage area in a 5G network provided in the embodiment of the present application;
fig. 2 is a schematic circuit structure diagram of a radio frequency module according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a frequency extension of an N5 duplexer provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly 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 that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.
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 make the application background of the embodiments of the present application clearer, the following description is first made on the related concepts involved in the embodiments of the present application:
for the mainstream commercial frequency band of 5G, for example, 3.5GHz, 2.6GHz, etc., in order to realize higher network rate, downlink 4 × 4 Multiple Input Multiple Output (MIMO) is introduced, while uplink can only be 2 × 2 MIMO. From the comparison of the MIMO quantities of the uplink and downlink, it can be seen that the uplink and downlink of the electronic device such as the mobile phone are not matched at the network end, that is, the downlink signal is good, but the uplink signal is very poor, so that the user experience is seriously affected, especially in the 5G frequency band, the higher the frequency is, the more serious the influence is. The difference of uplink and downlink coverage in an actual network is shown in fig. 1a, where the downlink coverage is very good, and the uplink may not be covered.
In the rel.15 standard of 3GPP, an Uplink enhancement technology, i.e. Supplemental Uplink (SUL), is newly added, and Uplink coverage is ensured by providing a supplemental Uplink (generally, a low frequency band), and the lower the frequency, the larger the coverage, so that it is feasible to add the low frequency band as the supplemental Uplink.
For a communication system using the SUL, a downlink frequency band, i.e., a New Radio (NR) frequency band and 2 uplink frequency bands, i.e., an NR frequency band and a SUL frequency band, are configured in the same cell. Under the condition that the uplink coverage of the NR carrier wave is good, the electronic equipment adopts the NR carrier wave to transmit and receive data; when the coverage of the NR carrier is exceeded, the electronic device transmits data using the SUL carrier. The electronic device may dynamically select the transmission link between the uplink NR and the SUL, but at the same time, the electronic device may select only one of the transmissions, and may not use both of the uplinks at the same time.
As shown in fig. 1B, in the area a, the electronic device uses the NR frequency band for uplink data transmission, and in the area B, the electronic device switches to the SUL frequency band for uplink data transmission.
The frequency band ranges defined in the 3GPP standards organization are shown in table 1 below.
Table 13 frequency band ranges defined in the GPP standards organization
As can be seen from the above table, the TX frequencies of the N81 and the N8 bands are the same, so that when the architecture combining the N78 and the SUL is adopted, the N81 SUL band can implement signal transmission by multiplexing the TX channels of the N8 band. When signals in an N81 frequency band are transmitted, fourth harmonics (3520-3660 MHz) generated by the N81 frequency band just fall in an N78 frequency band, interference is caused on received RX signals in an N78 frequency band, the suppression degree of a transmitting end of an N8 duplexer to the fourth harmonics can only reach 28db generally, and the suppression effect on harmonic interference is poor.
The radio frequency circuit provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a radio frequency circuit according to an embodiment of the present application, and as shown in fig. 2, the radio frequency circuit includes:
a power amplification module 20;
a first duplexer 21, a transmitting end of the first duplexer 21 is connected to a first end of the power amplification module 20, a receiving end of the first duplexer 21 is connected to a second end of the power amplification module 20 through a first switch 25, the receiving end of the first duplexer 21 is connected to a stationary end of the first switch 25, a first moving end of the first switch 25 is connected to a second end of the power amplification module 20, and a second moving end of the first switch 25 is connected to a receiving module 24;
a second duplexer 22, wherein a transmitting terminal of the second duplexer 22 is connected to a third terminal of the power amplification module 20;
an antenna 23, the antenna 23 being connected to the third terminal of the first duplexer 21 and to the second terminal of the second duplexer 22;
wherein, the first duplexer 21 and the second duplexer 22 respectively work in different frequency bands, and the receiving end of the first duplexer 21 and the transmitting end of the second duplexer 22 can both supplement the transmitting signal of the uplink SUL frequency band through the same target, the degree of suppression of the harmonic interference of the target SUL frequency band by the receiving end of the first duplexer 21 is greater than the degree of suppression of the harmonic interference of the target SUL frequency band by the transmitting end of the second duplexer 22, and under the condition that the transmitting power of the target SUL frequency band is greater than or equal to the first preset power, the transmitting signal of the target SUL frequency band passes through the receiving end of the first duplexer and is transmitted through the first duplexer and the antenna.
In the embodiment of the application, to a certain SUL frequency band, can multiplex the transmission that realizes SUL frequency band signal in the signal path of two duplexers of different frequency bands, and wherein the degree of suppression of the receiving end of a duplexer to the harmonic interference of this SUL frequency band is greater than the degree of suppression of the transmitting end of another duplexer to the harmonic interference of this SUL frequency band, make the transmitting signal of this SUL frequency band can select suitable route to transmit according to the power size of transmitting signal, when the transmitting signal power of SUL frequency band is great, can choose the higher signal path of degree of suppression for use, with effective suppression harmonic interference, when the transmitting signal power of SUL frequency band is less, can choose the higher signal path of degree of suppression for use, also can choose the lower signal path that but the loss of power consumption is less for use.
Specifically, as shown in fig. 2, the radio frequency circuit provided in the embodiment of the present application includes a power amplification module 20, a first duplexer 21, a second duplexer 22, and an antenna 23, where the power amplification module 20 is configured to amplify transmission signals in different frequency bands, and then transmit the amplified transmission signals to duplexers in corresponding frequency bands through appropriate ports, so as to transmit the signals through the antenna; the first duplexer 21 and the second duplexer 22 are two duplexers respectively operating in different frequency bands, and the receiving end of the first duplexer 21 and the transmitting end of the second duplexer 22 may pass the transmission signals of the same target SUL band, i.e., the receiving band of the first duplexer 21 and the transmitting band of the second duplexer 22, are approximately the same, so that the target SUL band signal can pass through, and the transmitting terminal of the first duplexer 21 is connected to the first terminal of the power amplification module 20, the receiving terminal of the first duplexer 21 is connected to the second terminal of the power amplification module 20 through the first switch 25, the transmitting terminal of the second duplexer 22 is connected to the third terminal of the power amplification module 20, the transmitting end and the receiving end of the first duplexer 21 may pass different frequency bands, and the power amplification module 20 may select to transmit the transmitting signal to a corresponding port of a corresponding duplexer through a corresponding port according to the signal of different frequency bands to be transmitted; the antenna 23 is connected to the third terminal of the first duplexer 21 and the second terminal of the second duplexer 22, and can transmit the signal transmitted by the first duplexer 21 or the second duplexer 22, and can also receive the signal and transmit the signal to the receiving module 24 through the first duplexer 21 or the second duplexer 22.
Specifically, as shown in fig. 2, a switch may be added between the receiving end of the first duplexer 21 and the power amplification module 20 for switching a signal path of the receiving end of the first duplexer 21 so as not to affect the normal receiving of the working frequency band by the first duplexer 21 when the target SUL frequency band is at the receiving end of the first duplexer 21, where a stationary end of the first switch 25 is connected to the receiving end of the first duplexer 21, a first moving end of the first switch 25 is connected to the second end of the power amplification module 20, and a second moving end of the first switch 25 is connected to the receiving module 24.
Thus, when the receiving end of the first duplexer 21 needs to be multiplexed to transmit the transmitting signal of the target SUL band, the stationary end of the first switch 25 may be controlled to communicate with the first moving end, so that the transmitting signal of the target SUL band may enter the first duplexer 21 through the receiving end of the first duplexer 21, and then be transmitted to the antenna 23 through the third end of the first duplexer 21 to be transmitted; when the receiving end of the first duplexer 21 does not need to be multiplexed, the stationary end of the first switch 25 may be controlled to communicate with the second moving end, so that the signal received by the antenna 23 may enter the first duplexer 21 through the third end of the first duplexer 21, and then be transmitted to the receiving module 24 through the receiving end of the first duplexer 21.
Thus, with this embodiment, it is ensured that the receiving end of the first duplexer 21 is multiplexed to transmit the transmission signal of the target SUL band without affecting the signal receiving function of the first duplexer 21.
Optionally, when the transmission power of the target SUL band is greater than or equal to a first preset power, the stationary end of the first switch 25 is communicated with the first moving end of the first switch 25, and the transmission signal of the target SUL band is transmitted through the first duplexer 21 and the antenna 23 via the receiving end of the first duplexer 21;
and transmitting the transmission signal of the target SUL frequency band through the second duplexer and the antenna by the transmitting end of the second duplexer under the condition that the transmission power of the target SUL frequency band is smaller than the first preset power.
Under the condition of the transmitting powers of different sizes of the target SUL frequency bands, the generated harmonic interference degrees are different, and the interference generated when the transmitting power is larger is stronger, so that the transmitting power limit value, namely the first preset power, can be determined according to the receiving degree of the harmonic interference, and whether to multiplex the receiving end of the first duplexer 21 is selected based on the transmitting power limit value. Taking the N81 SUL band as an example, considering that when the transmission power of the band is greater than or equal to 20dbm, the interference of the generated fourth harmonic to the receiving band of N78 is unacceptable over 3db, and when the transmission power of the band is less than 20dbm, the interference of the generated fourth harmonic to the receiving band of N78 is not greater than 3db, which is acceptable, the first preset power can be set to 20 dbm.
In this embodiment, when the transmission power of the target SUL band is greater than or equal to the first preset power, the transmission channel with a relatively high suppression degree may be selected to effectively suppress the harmonic interference of the target SUL band, so that the stationary end of the first switch 25 may be controlled to communicate with the first moving end, so that the transmission signal of the target SUL band is transmitted through the first duplexer 21 and the antenna 23 via the receiving end of the first duplexer 21. When the transmission power of the target SUL band is smaller than the first preset power, it is not necessary to select a signal path corresponding to the receiving end of the first duplexer 21, so that the stationary end and the second moving end of the first switch 25 may be controlled to communicate with each other, so that the transmission signal of the target SUL band is transmitted through the transmitting end of the second duplexer 22 via the second duplexer 22 and the antenna 23.
Thus, a transmission path is selected based on the transmission power of the target SUL frequency band, and a good harmonic interference suppression effect can be ensured.
Optionally, the receiving end frequency band of the first duplexer 21 is extended according to the target SUL frequency band, and the receiving end frequency band of the first duplexer 21 includes the target SUL frequency band after being extended.
In an implementation, in order to enable the receiving end frequency band of the first duplexer 21 to include the target SUL frequency band, it is ensured that the transmitting signal of the target SUL frequency band can pass through the receiving end of the first duplexer 21, the receiving end frequency band of the first duplexer 21 can be expanded in advance, and specifically, the minimum limit or the maximum limit of the receiving end frequency band of the first duplexer 21 can be expanded according to the value range of the target SUL frequency band, so that the target SUL frequency band falls into the receiving frequency band range after the expansion of the first duplexer 21.
Referring to fig. 3, taking an N5 duplexer and an N81 SUL band as an example, the transmitting band of the N5 duplexer before expansion is 824-849 MHz, the receiving band is 868-894 MHz, and the N81 SUL band is 880-915 MHz, so that in order to multiplex the receiving end of the N5 duplexer, the receiving band can be expanded, the receiving band is expanded from 868-894 MHz to 868-915 MHz, that is, the maximum frequency limit is expanded by 21MHz, so that the receiving RX end of the N5 duplexer after expansion can include the N81 SUL band, so that the transmitting signal of any frequency in the N81 SUL band can pass through the receiving RX end of the N5 duplexer after expansion, and because the expansion frequency is not large, the signal reception of the N5 duplexer will not be greatly affected.
It should be noted that, when selecting the multiplexing duplexer, according to the target SUL frequency range, the selected frequency range is substantially the same as or has a small difference with the target SUL frequency range, and the selected duplexer has a high harmonic interference suppression degree, so as to ensure that the original transceiving function of the multiplexing channel is not greatly affected when multiplexing the signal channel of the duplexer.
Thus, with this embodiment, when the band range of the duplexer to be multiplexed does not coincide with the target SUL band range, the reusability thereof can be secured by frequency extension.
Optionally, the power amplification module 20 includes a power amplifier and a second switch;
the power amplifier is connected with the immobile end of the second switch, the first mobile end of the second switch is connected with the transmitting end of the first duplexer 21, the second mobile end of the second switch is connected with the receiving end of the first duplexer 21, and the third mobile end of the second switch is connected with the transmitting end of the second duplexer 22.
That is, the power amplification module 20 may include a power amplifier and a second switch, a stationary end of the second switch is connected to the power amplifier, a first moving end of the second switch is connected to the transmitting end of the first duplexer 21, and when the stationary end of the second switch is communicated with the first moving end, the power amplifier may transmit a signal in a transmitting frequency band of the first duplexer 21 to the antenna 23 through the first duplexer 21; the second moving end of the second switch is connected to the receiving end of the first duplexer 21, and when the stationary end of the second switch is connected to the second moving end, the power amplifier may transmit the signal of the target SUL band to the antenna 23 through the first duplexer 21; the third moving end of the second switch is connected to the transmitting end of the second duplexer 22, and when the stationary end of the second switch is connected to the third moving end, the power amplifier may transmit the signal in the target SUL band or the signal in the transmitting band of the second duplexer 22 to the antenna 23 through the second duplexer 22.
Thus, when the signal needs to be transmitted, the signal of each frequency band can be transmitted by switching to the corresponding signal path through the second selector switch according to the information such as the frequency and power of the transmitted signal.
Optionally, when the transmission power of the target SUL band is greater than or equal to a second preset power, the stationary end of the second switch is communicated with the second moving end of the second switch, and the transmission signal of the target SUL band is transmitted through the receiving end of the first duplexer 21 via the first duplexer 21 and the antenna 23;
when the transmission power of the target SUL band is smaller than the second preset power, the stationary end of the second switch is communicated with the third movable end of the second switch, and the transmission signal of the target SUL band is transmitted through the second duplexer 22 and the antenna 23 via the transmission end of the second duplexer 22.
Under the condition of the transmitting powers of different sizes of the target SUL frequency bands, the generated harmonic interference degrees are different, and the interference generated when the transmitting power is larger is stronger, so that the transmitting power limit value, namely the second preset power, can be determined according to the receiving degree of the harmonic interference, and further, based on the transmitting power limit value, whether the receiving end of the first duplexer 21 or the transmitting end of the second duplexer 22 is multiplexed is selected. Taking the N81 SUL band as an example, considering that when the transmission power of the band is greater than or equal to 20dbm, the interference of the generated fourth harmonic to the receiving band of N78 is unacceptable over 3db, and when the transmission power of the band is less than 20dbm, the interference of the generated fourth harmonic to the receiving band of N78 is not greater than 3db, which is acceptable, the second predetermined power can be set to 20 dbm. The second preset power may be the same as the aforementioned first preset power.
In this embodiment, when the transmission power of the target SUL band is greater than or equal to the second preset power, the transmission channel with a large suppression degree may be selected to effectively suppress the harmonic interference of the target SUL band, so that the stationary end and the second moving end of the second switch may be controlled to communicate with each other, so that the transmission signal of the target SUL band is transmitted through the first duplexer 21 and the antenna 23 via the receiving end of the first duplexer 21. And when the transmission power of the target SUL band is smaller than the second preset power, a transmission channel with a smaller suppression degree but smaller power loss can be selected, and the signal receiving function of the receiving end of the first duplexer 21 is ensured on the premise of suppressing the harmonic interference of the target SUL band, so that the stationary end and the third movable end of the second switch can be controlled to be communicated, so that the transmission signal of the target SUL band is transmitted through the transmission end of the second duplexer 22 via the second duplexer 22 and the antenna 23.
Therefore, a proper transmission path is selected based on the transmission power of the target SUL frequency band, and a good harmonic interference suppression effect can be ensured.
Alternatively, as shown in fig. 2, the antenna 23 is connected to the first duplexer 21 and the second duplexer 22 through a third switch 26;
the antenna 23 is connected to the stationary end of the third switch 26, the first moving end of the third switch 26 is connected to the third end of the first duplexer 21, and the second moving end of the third switch 26 is connected to the second end of the second duplexer 22.
That is, the antenna 23 and each duplexer can be connected through a third switch 26, specifically, as shown in fig. 2, a stationary terminal of the third switch 26 is connected to the antenna 23, a first moving terminal of the third switch 26 is connected to a third terminal of the first duplexer 21, and a second moving terminal of the third switch 26 is connected to a second terminal of the second duplexer 22, so that when signals of different frequency bands need to be transmitted or received, the signals can be transmitted or received by switching to an appropriate path through the third switch 26.
Optionally, the first duplexer 21 operates in an N5 frequency band, the second duplexer 22 operates in an N8 frequency band, and the target SUL frequency band is an N81 frequency band.
In one embodiment, the target SUL band may be an N81 band, i.e., the transmission frequency range is 880 to 915MHz, the second duplexer 22 may be an N8 band consistent with the transmission frequency range of the N81 band, i.e., the transmission frequency range of the N8 band is also 880 to 915MHz, and the reception frequency range is 925 to 960MHz, so that the N81 SUL band may directly multiplex the transmission end of the duplexer of the N8 band. The first duplexer 21 may operate in an N5 frequency band, where a transmitting frequency band is 824-849 MHz, and a receiving frequency band is 869-894 MHz, and thus, a receiving frequency range of the N5 frequency band is not much different from a transmitting frequency range of the N81 frequency band, and the receiving frequency band of the N5 may include the transmitting frequency band of N81 by extending a frequency, so that the N81 SUL frequency band may multiplex a receiving end of the extended duplexer of the N5 frequency band.
And the suppression degree of the receiving end of the N5 frequency band to the fourth harmonic interference of the N81 frequency band in the N78 frequency band, namely, the range of 3300-3800 MHz can reach 60db, which is far higher than the suppression degree of the transmitting end of the N8 frequency band to the fourth harmonic interference of the N78 frequency band by 28db, therefore, an appropriate path can be selected and multiplexed to transmit the N81 SUL frequency band signal according to the transmitting power of the N81 frequency band.
For example, as shown in fig. 2, assuming that when the transmission power of the N81 frequency band signal is greater than 20dbm, it is unacceptable that the interference of the fourth harmonic interference generated by the N8TX path to the receiving RX end of N78 exceeds 3db, and when the transmission power of the N81 frequency band signal is less than 20dbm, the interference of the fourth harmonic interference generated by the N8TX path to the receiving RX end of N78 is acceptable.
Based on this, when the transmission power of the N81 frequency band signal is greater than 20dbm, the multiplexing signal path is: the power amplification module 20 → the first switch 25 → the expanded N5 duplexer 21 → the third switch 26 → the antenna 23, and this path can increase the suppression of the harmonic generated in the N81 band and solve the problem that the harmonic in the N81 band interferes with the receiving RX end of the N78.
When the transmission power of the N81 frequency band signal is less than 20dbm, the multiplexing signal path is: the power amplification module 20 → the N8 duplexer 22 → the third switch 26 → the antenna 23, which has a small loss (loss), so that the power consumption problem of the N81 band can be improved when the N81 transmits a small power, and the interference of the fourth harmonic of the N81 band to the RX end of the N78 is within an acceptable range.
Thus, the embodiment can effectively solve the problem of interference caused by fourth harmonic interference when the signal of the N81 frequency band is transmitted to the received RX signal of the N78 frequency band.
According to the embodiment of the application, the N81 SUL frequency band signal transmission scheme is realized by expanding the duplexer frequency of the N5 RX end, the problem that the SUL frequency band signal interferes with the N78 frequency band receiving end under high power is reduced, and meanwhile, a path with low power consumption loss is taken into consideration under low power.
The radio frequency circuit in the embodiment of the application comprises: a power amplification module; a transmitting end of the first duplexer is connected with a first end of the power amplification module, a receiving end of the first duplexer is connected with a second end of the power amplification module through a first switch, the receiving end of the first duplexer is connected with a fixed end of the first switch, a first movable end of the first switch is connected with a second end of the power amplification module, and a second movable end of the first switch is connected with a receiving module; a transmitting end of the second duplexer is connected with a third end of the power amplification module; an antenna connected to a third terminal of the first duplexer and to a second terminal of the second duplexer; the first duplexer and the second duplexer respectively work in different frequency bands, the receiving end of the first duplexer and the transmitting end of the second duplexer can supplement the transmitting signals of the uplink SUL frequency band through the same target, the suppression degree of the harmonic interference of the target SUL frequency band by the receiving end of the first duplexer is greater than that of the harmonic interference of the target SUL frequency band by the transmitting end of the second duplexer, and under the condition that the transmitting power of the target SUL frequency band is greater than or equal to first preset power, the transmitting signals of the target SUL frequency band pass through the receiving end of the first duplexer and are transmitted through the first duplexer and the antenna. Thus, by multiplexing the target SUL band with a signal path of a band having a high suppression degree of harmonic interference in the SUL band, it is possible to ensure that harmonic interference generated in the SUL band is suppressed more effectively.
The embodiment of the application also provides electronic equipment which comprises the radio frequency circuit.
It should be noted that the implementation manner of the foregoing radio frequency circuit embodiment is also applicable to the embodiment of the electronic device, and can achieve the same technical effect, and details are not described herein again.
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 (8)
1. A radio frequency circuit, comprising:
a power amplification module;
a transmitting end of the first duplexer is connected with a first end of the power amplification module, a receiving end of the first duplexer is connected with a second end of the power amplification module through a first switch, the receiving end of the first duplexer is connected with a fixed end of the first switch, a first movable end of the first switch is connected with a second end of the power amplification module, and a second movable end of the first switch is connected with a receiving module;
a transmitting end of the second duplexer is connected with a third end of the power amplification module;
an antenna connected to a third terminal of the first duplexer and to a second terminal of the second duplexer;
the first duplexer and the second duplexer respectively work in different frequency bands, the receiving end of the first duplexer and the transmitting end of the second duplexer can supplement the transmitting signals of the uplink SUL frequency band through the same target, the suppression degree of the harmonic interference of the target SUL frequency band by the receiving end of the first duplexer is greater than that of the harmonic interference of the target SUL frequency band by the transmitting end of the second duplexer, and under the condition that the transmitting power of the target SUL frequency band is greater than or equal to first preset power, the transmitting signals of the target SUL frequency band pass through the receiving end of the first duplexer and are transmitted through the first duplexer and the antenna.
2. The RF circuit of claim 1, wherein the transmitting signal of the target SUL band is transmitted through the second duplexer and the antenna via the transmitting end of the second duplexer when the transmitting power of the target SUL band is less than the first predetermined power.
3. The radio frequency circuit according to claim 1, wherein a receiving end frequency band of the first duplexer is extended according to the target SUL frequency band, and the receiving end frequency band of the first duplexer includes the target SUL frequency band after the extension.
4. The radio frequency circuit according to claim 1, wherein the power amplification module comprises a power amplifier and a second switch;
the power amplifier is connected with the immobile end of the second change-over switch, the first mobile end of the second change-over switch is connected with the transmitting end of the first duplexer, the second mobile end of the second change-over switch is connected with the receiving end of the first duplexer, and the third mobile end of the second change-over switch is connected with the transmitting end of the second duplexer.
5. The RF circuit according to claim 4, wherein when the transmission power of the target SUL band is greater than or equal to a second predetermined power, the stationary terminal of the second switch is connected to the second movable terminal of the second switch, and the transmission signal of the target SUL band is transmitted through the first duplexer and the antenna via the receiving terminal of the first duplexer;
and when the transmitting power of the target SUL frequency band is smaller than the second preset power, the immovable end of the second change-over switch is communicated with the third movable end of the second change-over switch, and the transmitting signal of the target SUL frequency band is transmitted through the transmitting end of the second duplexer and the antenna through the second duplexer.
6. The radio frequency circuit of claim 1, wherein the first duplexer operates in an N5 frequency band, the second duplexer operates in an N8 frequency band, and the target SUL frequency band is an N81 frequency band.
7. The radio frequency circuit according to claim 1, wherein the antenna is connected to the first duplexer and the second duplexer through a third switch;
the antenna is connected with a fixed end of the third switch, a first movable end of the third switch is connected with a third end of the first duplexer, and a second movable end of the third switch is connected with a second end of the second duplexer.
8. An electronic device comprising the radio frequency circuit of any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121305869.9U CN215601302U (en) | 2021-06-10 | 2021-06-10 | Radio frequency circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121305869.9U CN215601302U (en) | 2021-06-10 | 2021-06-10 | Radio frequency circuit and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215601302U true CN215601302U (en) | 2022-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121305869.9U Active CN215601302U (en) | 2021-06-10 | 2021-06-10 | Radio frequency circuit and electronic device |
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| Country | Link |
|---|---|
| CN (1) | CN215601302U (en) |
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2021
- 2021-06-10 CN CN202121305869.9U patent/CN215601302U/en active Active
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