Frequency conversion circuit, antenna system and electronic equipment

Abstract

The invention provides a frequency conversion circuit, an antenna system and electronic equipment, and belongs to the technical field of communication. The frequency conversion circuit is provided with an input end, a first output end and a second output end. The frequency conversion circuit comprises a frequency selection sub-circuit, a combining sub-circuit, a frequency mixing sub-circuit, an acquisition sub-circuit and an amplification sub-circuit.

Description

Technical Field

[0001] The present invention belongs to the field of communication technology, and in particular relates to a frequency conversion circuit, an antenna system and an electronic device. Background Art

[0002] In order to achieve high-speed and high-reliability wireless communication, the fifth generation mobile communication technology (5G) is increasingly widely used. However, in the distribution system of 5G signals, due to the large amount of user data, multiple-input multiple-output (MIMO) antennas are often required to achieve this. The existing distributed indoor systems are basically upgraded from 4G distributed indoor systems and cannot support the use of 5G MIMO antennas. The equipment and construction costs required for comprehensive transformation are extremely large, and a more efficient and reliable signal transmission solution is needed to solve these problems. Summary of the invention

[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art and provides a frequency conversion circuit, an antenna system and an electronic device.

[0004] In the first aspect, the technical solution adopted to solve the technical problem of the present disclosure is a frequency conversion circuit, which has an input end, a first output end and a second output end; the frequency conversion circuit includes a frequency selection subcircuit, a combining subcircuit, a mixing subcircuit, a collection subcircuit and an amplification subcircuit; wherein,

[0005] The frequency selection subcircuit is configured to select the radio frequency signal input from the input end into a first frequency band signal, a second frequency band signal, a third frequency band signal and a local oscillator signal according to the frequency; the frequency of the third frequency band signal is between the frequencies of the first frequency band signal and the second frequency band signal;

[0006] The combining sub-circuit is configured to combine the first frequency band signal and the second frequency band signal, and output a first radio frequency signal through the first output terminal, wherein the first radio frequency signal at least includes a radio frequency signal of a specific frequency band;

[0007] The acquisition subcircuit is configured to divide the local oscillator signal into a first local oscillator signal and a second local oscillator signal, and convert the first local oscillator signal into a DC level and output it to the amplification subcircuit;

[0008] The mixing subcircuit is configured to mix the third frequency band signal and the second local oscillator signal to generate a second radio frequency signal, and output the second radio frequency signal to the amplifying subcircuit; the second radio frequency signal is a radio frequency signal of a specific frequency band;

[0009] The amplifying subcircuit is configured to amplify the second RF signal to generate a third RF signal according to the DC level output by the collecting subcircuit, and output the third RF signal through the second output terminal.

[0010] In some embodiments, the frequency selection subcircuit includes a first duplexer, a second duplexer, a matching circuit, and a first dielectric filter;

[0011] The first duplexer has a first RF channel and a second RF channel, the first RF channel is configured to output the first frequency band signal, the third frequency band signal and the initial local oscillator signal among the RF signals inputted from the input end, and the second RF channel is configured to output the second frequency band signal among the RF signals inputted from the input end;

[0012] The second duplexer has a third RF channel and a fourth RF channel, the third RF channel and the fourth RF channel are both connected to the first RF channel, the third RF channel is configured to output a first frequency band signal, and the fourth RF channel is configured to output a third frequency band signal;

[0013] The matching circuit is configured to perform impedance matching on the first dielectric filter and the second duplexer;

[0014] The first dielectric filter is configured to filter the initial local oscillator signal and output the local oscillator signal.

[0015] In some embodiments, the frequency selection subcircuit includes a first duplexer and a dielectric triplexer;

[0016] The first duplexer has a first RF channel and a second RF channel, the first RF channel is configured to output the first frequency band signal, the third frequency band signal and the local oscillator signal among the RF signals inputted from the input end, and the second RF channel is configured to output the second frequency band signal among the RF signals inputted from the input end;

[0017] The dielectric triplexer has a fifth RF channel, a sixth RF channel and a seventh RF channel. The fifth RF channel, the sixth RF channel and the seventh RF channel are all connected to the first RF channel and are respectively configured to output the first frequency band signal, the third frequency band signal and the local oscillator signal.

[0018] In some embodiments, the frequency selection subcircuit includes a dielectric quadplexer, and the dielectric quadplexer has an eighth RF channel, a ninth RF channel, a tenth RF channel, and an eleventh RF channel; the eighth RF channel, the ninth RF channel, the tenth RF channel, and the eleventh RF channel are respectively configured to select the frequency of the RF signal input by the input end, and output the first frequency band signal, the second frequency band signal, the third frequency band signal, and the local oscillator signal.

[0019] In some embodiments, the combining subcircuit comprises a duplexer.

[0020] In some embodiments, the acquisition subcircuit includes a first power divider and a rectifier unit;

[0021] The first power divider is configured to divide the local oscillator signal into a first local oscillator signal and a second local oscillator signal, and output the first local oscillator signal to the rectifying unit, and output the second local oscillator signal to the mixing sub-circuit;

[0022] The rectifying unit is configured to convert the first local oscillator signal into a direct current level and output the direct current level to the amplifying sub-circuit.

[0023] In some embodiments, the acquisition subcircuit further includes a first isolator and a second isolator;

[0024] The first isolator is connected between the first power divider and the mixing sub-circuit and is configured to transmit the second local oscillator signal unidirectionally;

[0025] The second isolator is connected between the first power divider and the rectifying unit, and is configured to transmit the first local oscillator signal unidirectionally.

[0026] In some embodiments, the acquisition subcircuit includes a first coupler, a third isolator, a fourth isolator, and a rectifying unit;

[0027] The first coupler is configured to divide the local oscillator signal into a first local oscillator signal and a second local oscillator signal, and output the first local oscillator signal to the rectifying unit, and output the second local oscillator signal to the mixing sub-circuit;

[0028] The rectifying unit is configured to convert the first local oscillator signal into a DC level and output it to the amplifying sub-circuit;

[0029] The third isolator is connected between the first coupler and the mixing sub-circuit and is configured to transmit the second local oscillator signal unidirectionally;

[0030] The fourth isolator is connected between the first coupler and the rectifying unit, and is configured to transmit the first local oscillator signal unidirectionally.

[0031] In some embodiments, the acquisition subcircuit further includes a linear regulator;

[0032] The linear regulator is connected between the rectifying unit and the amplifying sub-circuit, and is configured to stabilize the DC level output by the rectifying unit.

[0033] In some embodiments, the rectifying unit includes a rectifying diode or a rectifying MOS tube.

[0034] In some embodiments, the mixing subcircuit includes an IQ mixer, a first matching balun, a second matching balun, a third matching balun, and a second dielectric filter;

[0035] The first matching balun is configured to perform impedance matching between the third frequency band signal and the two signals required by the IQ mixer;

[0036] The second matching balun is configured to perform impedance matching between the second local oscillator signal and two signals required by the IQ mixer;

[0037] The third matching balun is configured to perform impedance matching between the two signals output by the IQ mixer and the second dielectric filter;

[0038] The second dielectric filter is configured to filter the initial second radio frequency signal output by the third matching balun, and output the second radio frequency signal to the amplifying sub-circuit.

[0039] In some embodiments, the mixing subcircuit includes a non-IQ mixer and a second dielectric filter;

[0040] The non-IQ mixer is configured to mix the third frequency band signal with the second local oscillator signal to output an initial second radio frequency signal;

[0041] The second dielectric filter is configured to filter the initial second radio frequency signal and output the second radio frequency signal to the amplifying sub-circuit.

[0042] In some embodiments, the amplification subcircuit includes a low noise amplifier.

[0043] In some embodiments, the radio frequency signal of the specific frequency band is a 5G radio frequency signal.

[0044] In a second aspect, an embodiment of the present disclosure further provides an antenna system, which includes the frequency conversion circuit described in any one of the above embodiments.

[0045] In some embodiments, the antenna system further includes a first antenna unit and a second antenna unit, the first antenna unit is configured to transmit the first radio frequency signal, and the second antenna unit is configured to transmit the third radio frequency signal.

[0046] In some embodiments, the first antenna unit includes any one of a directional antenna, an omnidirectional antenna, a horizontal plane antenna, a MIMO antenna, and a gain antenna.

[0047] In some embodiments, the second antenna unit includes any one of a directional antenna, an omnidirectional antenna, a horizontal plane antenna, a MIMO antenna, and a gain antenna.

[0048] In some embodiments, the antenna system comprises a distributed antenna system.

[0049] In a third aspect, an embodiment of the present disclosure further provides an electronic device, which includes the antenna system described in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A schematic diagram of a frequency conversion circuit structure provided in an embodiment of the present disclosure;

[0051] Figure 2 It is a circuit structure diagram of a first embodiment of a frequency selection subcircuit of a frequency conversion circuit in an embodiment of the present disclosure;

[0052] Figure 3 Schematic diagram of the circuit structure of a second embodiment of the frequency selection subcircuit of the frequency conversion circuit in the embodiment of the present disclosure;

[0053] Figure 4 Schematic diagram of the circuit structure of a third embodiment of the frequency selection subcircuit of the frequency conversion circuit in the embodiment of the present disclosure;

[0054] Figure 5 It is a circuit structure diagram of a first embodiment of a collection subcircuit of a frequency conversion circuit in an embodiment of the present disclosure;

[0055] Figure 6 It is a circuit structure diagram of a second embodiment of the acquisition subcircuit of the frequency conversion circuit in the embodiment of the present disclosure;

[0056] Figure 7 It is a circuit structure diagram of a third embodiment of the acquisition subcircuit of the frequency conversion circuit in the embodiment of the present disclosure;

[0057] Figure 8a is a schematic diagram of the principle of the first power divider;

[0058] Figure 8b is a schematic diagram of the principle of the first coupler;

[0059] Fig. 9 It is a circuit structure diagram of a fourth embodiment of the acquisition subcircuit of the frequency conversion circuit in the embodiment of the present disclosure;

[0060] Fig.10 Schematic diagram of the circuit structure of a fifth embodiment of the acquisition subcircuit of the frequency conversion circuit in the embodiment of the present disclosure;

[0061] Fig.11 It is a circuit structure diagram of a first embodiment of a frequency mixing sub-circuit of a frequency conversion circuit in an embodiment of the present disclosure;

[0062] Fig.12 It is a circuit structure diagram of a second embodiment of a frequency mixing subcircuit of the frequency conversion circuit in the embodiment of the present disclosure;

[0063] Fig.13 The figure is a schematic diagram of a circuit structure of an embodiment of an amplifier subcircuit of a frequency conversion circuit in an embodiment of the present disclosure.

[0064] The reference numerals are as follows: Input, input terminal; Output1, first output terminal; Output2, second output terminal; 11, frequency selection subcircuit; 12, combining subcircuit; 13, mixing subcircuit; 14, acquisition subcircuit; 15, amplification subcircuit; 01, first frequency band signal; 02, second frequency band signal; IF, third frequency band signal; LO, local oscillator signal; LO1, first local oscillator signal; LO2, second local oscillator signal; DC, DC level; 111, first duplexer; 112, second duplexer; 113, matching circuit; 114, first dielectric filter; 111a, first RF channel; 111b, second RF channel; 112a, third RF channel; 112b, fourth RF channel frequency channel; 115, dielectric triplexer; 115a, fifth RF channel; 115b, sixth RF channel; 115c, seventh RF channel; 116, dielectric quadplexer; 116a, eighth RF channel; 116b, ninth RF channel; 116c, tenth RF channel; 116d, eleventh RF channel; 117, first power divider; 118, rectifier unit; 119, first isolator; 120, second isolator; 121, first coupler; 122, third isolator; 123, fourth isolator; 131, IQ mixer; 132, first matching balun; 133, second matching balun; 134, third matching balun; 135, second dielectric filter; 136, non-IQ mixer. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the technical scheme in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The components of the embodiments of the present disclosure generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the present disclosure for protection, but merely represents the selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present disclosure.

[0066] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0067] The "multiple or several" mentioned in this disclosure refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0068] In the existing frequency-shifting distributed antenna system (DAS) frequency conversion circuit solution, active frequency conversion circuit or passive frequency conversion circuit can be used. Among them, the active frequency conversion circuit uses integrated circuits to realize operations such as amplification, filtering, and mixing of radio frequency signals. However, due to the complexity and high power consumption of active devices, this solution has problems such as high system complexity, high cost, and high energy consumption. Because the passive frequency conversion circuit does not require an additional power supply line, the cost of layout and modification can be greatly reduced, but the frequency conversion loss of the passive frequency conversion circuit is generally large, so it takes more power consumption to achieve the same coverage effect as the active frequency conversion circuit.

[0069] In view of this, embodiments of the present disclosure provide a frequency conversion circuit, an antenna system, and an electronic device, which substantially eliminate one or more of the problems caused by limitations and defects of the related art.

[0070] Before introducing the frequency conversion circuit, antenna system and electronic device in the embodiment of the present disclosure, it should be noted that among the first frequency band signal, the second frequency band signal and the third frequency band signal mentioned in the embodiment of the present disclosure, the maximum frequency of the first frequency band signal is less than the minimum frequency of the third frequency band signal, and the maximum frequency of the third frequency band signal is less than the minimum frequency of the second frequency band signal. For the convenience of description, the first frequency band signal is referred to as a low-frequency signal, the second frequency band signal is referred to as a high-frequency signal, and the third frequency band signal is referred to as an intermediate frequency signal. The frequency conversion circuit in the embodiment of the present disclosure can be used to achieve bandwidth expansion of 5G radio frequency signals, that is, the radio frequency signal of a specific frequency band is used as a 5G radio frequency signal as an example in the embodiment of the present disclosure. However, it should be understood that for specific application scenarios, the bandwidth expansion of other frequency band signals can be achieved by selecting specific devices in the frequency conversion circuit (for example, the selection of filters).

[0071] In a first aspect, the technical solution adopted to solve the technical problem of the present disclosure is a frequency conversion circuit. Figure 1 A schematic diagram of a frequency conversion circuit structure provided in an embodiment of the present disclosure is shown in FIG. Figure 1As shown, the frequency conversion circuit has an input terminal Input, a first output terminal Output1 and a second output terminal Output2; the frequency conversion circuit includes a frequency selection subcircuit 11, a combining subcircuit 12, a mixing subcircuit 13, a collection subcircuit 14 and an amplification subcircuit 15; wherein the frequency selection subcircuit 11 is configured to select the RF signal inputted by the input terminal Input into a first frequency band signal 01, a second frequency band signal 02, a third frequency band signal IF and a local oscillator signal LO according to the frequency; the frequency of the third frequency band signal IF is between the frequencies of the first frequency band signal 01 and the second frequency band signal 02. The combining subcircuit 12 is configured to combine the first frequency band signal 01 and the second frequency band signal 02, and output the first RF signal through the first output terminal Output1, and the first RF signal at least includes a RF signal of a specific frequency band. The collection subcircuit 14 is configured to divide the local oscillator signal LO into a first local oscillator signal LO1 (not shown in the figure) and a second local oscillator signal LO2, and convert the first local oscillator signal LO1 into a DC level DC and output it to the amplification subcircuit 15. The mixing subcircuit 13 is configured to mix the third frequency band signal IF and the second local oscillator signal LO2 to generate a second RF signal, and output the second RF signal to the amplifying subcircuit 15; the second RF signal is a RF signal of a specific frequency band. The amplifying subcircuit 15 is configured to amplify the second RF signal according to the DC level DC output by the acquisition subcircuit 14 to generate a third RF signal, and output the third RF signal through the second output terminal Output2.

[0072] It should be noted that the embodiments of the present disclosure are described by taking the RF signal in the specific frequency band as a 5G RF signal as an example, which will not be repeated in the following text. The second RF signal is a 5G RF signal, and the third RF signal is the second RF signal after gain, that is, the third RF signal is actually also a 5G RF signal.

[0073] It should be noted that the first RF signal output by the combiner subcircuit 12 through the first output terminal Output1 in the embodiment of the present disclosure is composed of the high-frequency signal and the low-frequency signal written by the input terminal Input, that is, the first RF signal includes the high-frequency signal and the low-frequency signal. It can be understood that the first RF signal includes RF signals of multiple frequency bands, and the 5G RF signal is one of the RF signals of multiple frequency bands.

[0074] The frequency conversion circuit in the embodiment of the present disclosure is composed of a frequency selection subcircuit 11, a combining subcircuit 12, a mixing subcircuit 13, a collection subcircuit 14 and an amplification subcircuit 15. The circuit structure set in this way is simple, and can realize low-loss branching of signals for different purposes, thereby reducing the power loss of the entire circuit. The frequency conversion circuit can also achieve bandwidth expansion of 5G radio frequency signals, thereby improving the transmission rate and reliability of the signal. At the same time, the frequency conversion circuit in the embodiment of the present disclosure collects radio frequency energy by setting up a collection subcircuit 14 and an amplification subcircuit 15, and provides signal gain for the passive frequency conversion circuit that originally has large losses, thereby achieving an effect equivalent to active frequency conversion. That is, active amplification is realized in the architecture of the passive circuit, and the signal bandwidth is expanded at a low cost without changing the layout of the original indoor distribution system. It is suitable for signal processing applications of various frequency-shifting DAS antennas, and has broad application prospects and commercial value.

[0075] In the following, specific embodiments of the frequency selection subcircuit 11, the combining subcircuit 12, the mixing subcircuit 13, the acquisition subcircuit 14 and the amplification subcircuit 15 in the embodiment of the present disclosure are described respectively.

[0076] Before introducing the above structure, it should be noted that the RF signal inputted by the input terminal of the frequency conversion circuit includes two parts. The first part is the traditional communication signal frequency band (low-frequency signal and high-frequency signal), such as 900MHz, 1800MHz, 2GHz, 2.3GHz and 2.6GHz signals; the second part is the intermediate frequency signal and local oscillator signal LO used for frequency conversion to generate a 2.6GHz signal. The frequency bands of the intermediate frequency signal and local oscillator signal LO fall within the idle frequency bands of 900MHz and 1800MHz. Among them, the 2.6GHz signal is a 5G RF signal.

[0077] Correspondingly, the frequency band of the first RF signal output by the first output terminal Output1 includes 900 MHz, 1800 MHz, 2 GHz, 2.3 GHz and 2.6 GHz signals; the second RF signal output by the mixing sub-circuit 13 is another 2.6 GHz frequency band signal for bandwidth expansion generated by frequency conversion of the intermediate frequency signal and the second local oscillator signal LO2.

[0078] The frequency selection subcircuit 11 is used to split the traditional communication frequency band (i.e., the first frequency band signal 01 and the second frequency band signal 02) 900MHz, 1800MHz, 2GHz, 2.3GHz and 2.6GHz signals with the third frequency band signal IF and the local oscillator signal LO for mixing, and the 900MHz, 1800MHz, 2GHz, 2.3GHz and 2.6GHz signals are directly transmitted to the coverage scene by the antenna, and the third frequency band signal IF and the second local oscillator signal LO2 are transmitted to the coverage scene via the multiplexed antenna after mixing. The combining subcircuit 12 is used to combine the low-frequency signal (900MHz) and the high-frequency signal (1800MHz, 2GHz, 2.3GHz and 2.6GHz signals) in the non-mixing signal into one channel, and output it through the first output terminal Output1. In addition, since the principle of the multiplexing operation of the frequency selection subcircuit 11 is to divide different signals according to frequency bands through high-pass filters and low-pass filters, the third frequency band signal IF and the local oscillator signal LO must be separated from the original signal, and the 900MHz signal and the 1800MHz, 2GHz, 2.3GHz and 2.6GHz signals will inevitably be divided into two paths. At this time, the combining subcircuit 12 combines the signals, so that the antenna unit can transmit and cover the radio frequency signal. The acquisition subcircuit 14 is used to divide the local oscillator signal LO into a first local oscillator signal LO1 and a second local oscillator signal LO2, and convert the first local oscillator signal LO1 into a DC level DC output to the amplifier subcircuit 15, providing a DC power supply for the amplifier subcircuit 15. The mixing subcircuit 13 is mainly used to realize the frequency conversion of the third frequency band signal IF to the 2.6GHz signal, with the smallest possible frequency conversion loss and the best possible linearity, to meet the requirements of system communication. The amplifying subcircuit 15 provides active gain for the frequency conversion signal according to the DC level DC output by the collecting subcircuit 14, amplifies the second RF signal to generate a third RF signal, and outputs the third RF signal through the second output terminal Output2, thereby reducing the frequency conversion loss.

[0079] First, a specific embodiment of the frequency selection subcircuit 11 in the embodiment of the present disclosure is described.

[0080] First embodiment: Figure 2 FIG. 1 is a schematic diagram of a circuit structure of a first embodiment of the frequency selection subcircuit 11 of the frequency conversion circuit in the embodiment of the present disclosure. Figure 2 As shown, the frequency selection subcircuit 11 in this embodiment is composed of two duplexers, a matching circuit 113 and a dielectric filter. For the convenience of description and to distinguish from other embodiments, the two duplexers are respectively referred to as a first duplexer 111 and a second duplexer 112, and the dielectric filter is referred to as a first dielectric filter 114.

[0081] Among them, the first duplexer 111 has a first RF channel 111a and a second RF channel 111b, and the first RF channel 111a is configured to output the first frequency band signal 01, the third frequency band signal IF and the initial local oscillator signal in the RF signal input by the input terminal Input. Specifically, the first RF channel 111a is configured to output the relatively low frequency part of the RF signal input by the input terminal Input, that is, to output the low frequency signal, the intermediate frequency signal and the local oscillator signal LO (900MHz, IF signal and LO signal). The second RF channel 111b is configured to output the second frequency band signal 02 in the RF signal input by the input terminal Input. Specifically, the second RF channel 111b is configured to output the relatively high frequency part of the RF signal input by the input terminal Input, that is, to output the high frequency signal (1800MHz, 2GHz, 2.3GHz and 2.6GHz signals). The second duplexer 112 has a third RF channel 112a and a fourth RF channel 112b, both of which are connected to the first RF channel 111a, and the third RF channel 112a is configured to output a first frequency band signal 01, and the fourth RF channel 112b is configured to output a third frequency band signal IF. Specifically, the third RF channel 112a is configured to output a low frequency signal (900MHz), and the fourth RF channel 112b is configured to output an intermediate frequency signal (IF signal). The matching circuit 113 is configured to perform impedance matching on the first dielectric filter 114 and the second duplexer 112. The first dielectric filter 114 is configured to filter the initial local oscillator signal and output a local oscillator signal LO.

[0082] It should be noted that the reason why the first RF channel 111a, the second RF channel 111b, the third RF channel 112a and the fourth RF channel 112b can output RF signals of a specific frequency band is because corresponding filters, such as low-pass filters, high-pass filters, etc., are configured in the first RF channel 111a, the second RF channel 111b, the third RF channel 112a and the fourth RF channel 112b.

[0083] In this embodiment, the initial local oscillator signal is filtered by the first dielectric filter 114 because the frequency of the initial local oscillator signal is relatively close to the low-frequency signal (900 MHz) and the intermediate-frequency signal. Therefore, the first dielectric filter 114 is used for filtering to achieve greater out-of-band suppression, thereby ensuring that the insertion loss of other RF channels is not deteriorated.

[0084] In some embodiments, the first duplexer 111 and the second duplexer 112 include, but are not limited to, Low Temperature Co-fired Ceramic (LTCC) duplexers.

[0085] In some embodiments, the first dielectric filter 114 includes, but is not limited to, a LTCC filter.

[0086] In some embodiments, the matching circuit 113 may be composed of components such as capacitors and inductors that are electrically connected.

[0087] Second embodiment: Figure 3 FIG. 1 is a circuit structure diagram of a second embodiment of the frequency selection subcircuit 11 of the frequency conversion circuit in the embodiment of the present disclosure. Figure 3 As shown, the frequency selection subcircuit 11 in this embodiment includes a duplexer and a dielectric triplexer 115. Since the function of the duplexer is the same as that of the first duplexer 111 in the first embodiment, the duplexer is also referred to as the first duplexer 111.

[0088] Among them, the first duplexer 111 has a first RF channel 111a and a second RF channel 111b, and the first RF channel 111a is configured to output the first frequency band signal 01, the third frequency band signal IF and the local oscillator signal LO in the RF signal input by the input terminal Input. Specifically, the first RF channel 111a is configured to output the relatively low frequency part of the RF signal input by the input terminal Input, that is, to output the low frequency signal, the intermediate frequency signal and the local oscillator signal LO (900MHz, IF signal and LO signal). The second RF channel 111b is configured to output the second frequency band signal 02 in the RF signal input by the input terminal Input. Specifically, the second RF channel 111b is configured to output the relatively high frequency part of the RF signal input by the input terminal Input, that is, to output the high frequency signal (1800MHz, 2GHz, 2.3GHz and 2.6GHz signals). The dielectric triplexer 115 has a fifth RF channel 115a, a sixth RF channel 115b, and a seventh RF channel 115c, which are all connected to the first RF channel 111a and are respectively configured to output the first frequency band signal O1, the third frequency band signal IF, and the local oscillator signal LO. Specifically, the fifth RF channel 115a is configured to output the first frequency band signal O1 (i.e., the low frequency signal 900MHz), the sixth RF channel 115b is configured to output the third frequency band signal IF, and the seventh RF channel 115c is configured to output the local oscillator signal LO.

[0089] It should be noted that the reason why the first RF channel 111a, the second RF channel 111b, the fifth RF channel 115a, the sixth RF channel 115b and the seventh RF channel 115c can output RF signals of a specific frequency band is because corresponding filters, such as low-pass filters, high-pass filters, etc., are configured in the first RF channel 111a, the second RF channel 111b, the fifth RF channel 115a, the sixth RF channel 115b and the seventh RF channel 115c.

[0090] In this embodiment, a dielectric triplexer 115 is used to divide the low-frequency signal (900 MHz), IF signal and LO signal into three paths. Since the three frequency bands are closely spaced, an out-of-band suppression dielectric triplexer 115 is required to achieve this, which can greatly reduce the insertion loss of the IF signal, thereby reducing the frequency conversion loss of the entire system.

[0091] In some embodiments, the first duplexer 111 includes, but is not limited to, a LTCC duplexer.

[0092] The third embodiment: Figure 4 FIG. 1 is a schematic diagram of a circuit structure of a third embodiment of the frequency selection subcircuit 11 of the frequency conversion circuit in the embodiment of the present disclosure. Figure 4 As shown, the frequency selection subcircuit 11 in this embodiment includes a dielectric quadplexer 116, and the dielectric quadplexer 116 has an eighth RF channel 116a, a ninth RF channel 116b, a tenth RF channel 116c, and an eleventh RF channel 116d. The eighth RF channel 116a, the ninth RF channel 116b, the tenth RF channel 116c, and the eleventh RF channel 116d are respectively configured to perform frequency selection on the RF signal inputted by the input terminal Input, and output the first frequency band signal O1, the second frequency band signal O2, the third frequency band signal IF, and the local oscillator signal LO. Specifically, the eighth RF channel 116a is configured to perform frequency selection and output a first frequency band signal 01 (a low frequency signal of 900 MHz) for the RF signal inputted at the input end Input, the ninth RF channel 116b is configured to perform frequency selection and output a second frequency band signal 02 (a high frequency signal of 1800 MHz, 2 GHz, 2.3 GHz and 2.6 GHz) for the RF signal inputted at the input end Input, the tenth RF channel 116c is configured to perform frequency selection and output a third frequency band signal IF for the RF signal inputted at the input end Input, and the eleventh RF channel 116d is configured to perform frequency selection and output a local oscillator signal LO for the RF signal inputted at the input end Input.

[0093] In this embodiment, the frequency selection subcircuit 11 uses a dielectric quadplexer 116, which is used to divide the RF signal input from the input terminal Input into four paths. In this case, the circuit integration can be further increased, the circuit complexity can be reduced, and it is easier to produce.

[0094] In some embodiments, the combining subcircuit 12 includes a duplexer.

[0095] In some embodiments, the combining sub-circuit 12 includes, but is not limited to, a LTCC duplexer.

[0096] Specifically, the combining sub-circuit 12 in the embodiment of the present disclosure uses a duplexer, which can be a LTCC duplexer. The duplexer is used to combine the signals in reverse, so that the antenna unit can transmit and cover the radio frequency signal.

[0097] Next, a specific embodiment of the acquisition subcircuit 14 in the embodiment of the present disclosure is described.

[0098] First embodiment: Figure 5 FIG. 1 is a schematic diagram of the circuit structure of a first embodiment of the acquisition subcircuit 14 of the frequency conversion circuit in the embodiment of the present disclosure, as shown in FIG. Figure 5 As shown, the acquisition subcircuit 14 in this embodiment is composed of a power divider and a rectifier unit 118. For the convenience of description and to distinguish from other embodiments, the power divider is referred to as a first power divider 117.

[0099] The first power divider 117 is configured to divide the local oscillator signal LO into a first local oscillator signal LO1 and a second local oscillator signal LO2, and output the first local oscillator signal LO1 to the rectifier unit 118, and output the second local oscillator signal LO2 to the mixer sub-circuit 13. The rectifier unit 118 is configured to convert the first local oscillator signal LO1 into a DC level DC, and output it to the amplifier sub-circuit 15. Specifically, the first power divider 117 couples the local oscillator signal LO into the first local oscillator signal LO1 and the second local oscillator signal LO2, wherein the first local oscillator signal LO1 is provided to the rectifier unit 118 as radio frequency energy, and the second local oscillator signal LO2 is output to the mixer sub-circuit 13 for mixing with the third frequency band signal IF. The rectifier unit 118 rectifies the first local oscillator signal LO1 divided by the first power divider 117 into a DC level DC, and outputs it to the amplifier sub-circuit 15.

[0100] Second embodiment: Figure 6 FIG. 1 is a circuit structure diagram of a second embodiment of the acquisition subcircuit 14 of the frequency conversion circuit in the embodiment of the present disclosure, as shown in FIG. Figure 6 As shown, the acquisition subcircuit 14 in this embodiment is composed of a power divider, a rectifier unit 118 and two isolators. Since the function of the power divider is the same as that of the first power divider 117 in the first embodiment, the power divider is also referred to as the first power divider 117, and the two isolators are respectively referred to as the first isolator 119 and the second isolator 120.

[0101] The first power divider 117 is configured to divide the local oscillator signal LO into a first local oscillator signal LO1 and a second local oscillator signal LO2, and output the first local oscillator signal LO1 to the rectifying unit 118, and output the second local oscillator signal LO2 to the mixing sub-circuit 13. The rectifying unit 118 is configured to convert the first local oscillator signal LO1 into a DC level DC, and output it to the amplifying sub-circuit 15. The first isolator 119 is connected between the first power divider 117 and the mixing sub-circuit 13, and is configured to unidirectionally transmit the second local oscillator signal LO2. The second isolator 120 is connected between the first power divider 117 and the rectifying unit 118, and is configured to unidirectionally transmit the first local oscillator signal LO1.

[0102] Specifically, the first power divider 117 couples the local oscillator signal LO into a first local oscillator signal LO1 and a second local oscillator signal LO2, wherein the first local oscillator signal LO1 is provided to the rectifier unit 118 as radio frequency energy, and the second local oscillator signal LO2 is output to the mixer subcircuit 13 for mixing with the third frequency band signal IF. The rectifier unit 118 rectifies the first local oscillator signal LO1 divided by the first power divider 117 into a DC level DC, and outputs it to the amplifier subcircuit 15. The first isolator 119 is used for the second local oscillator signal LO2 generated by the first power divider 117 for mixing by the mixer subcircuit 13, so that the second local oscillator signal LO2 can be transmitted unidirectionally. After such a setting, the third frequency band signal IF and the 2.6 GHz signal leaked in the mixer subcircuit 13 will not leak back through the first power divider 117, and will not affect the DC level DC generated by the rectifier unit 118. The second isolator 120 is used for the first local oscillator signal LO1 generated by the first power divider 117 for energy collection by the collection sub-circuit 14, so that the first local oscillator signal LO1 can be transmitted unidirectionally. After such a setting, the collection sub-circuit 14 can be further isolated from the mixing sub-circuit 13, which is helpful to improve the intermodulation characteristics of the mixing signal. The rectifier unit 118 rectifies the first local oscillator signal LO1 divided by the first power divider 117 into a DC level DC and outputs it to the amplification sub-circuit 15.

[0103] The third embodiment: Figure 7 FIG. 1 is a schematic diagram of the circuit structure of the third embodiment of the acquisition subcircuit 14 of the frequency conversion circuit in the embodiment of the present disclosure, as shown in FIG. Figure 7 As shown, the acquisition subcircuit 14 in this embodiment is composed of a coupler, a rectifier unit 118 and two isolators. For the convenience of description and to distinguish from other embodiments, the coupler is referred to as the first coupler 121, and the two isolators are respectively referred to as the third isolator 122 and the fourth isolator 123.

[0104] The first coupler 121 is configured to divide the local oscillator signal LO into a first local oscillator signal LO1 and a second local oscillator signal LO2, and output the first local oscillator signal LO1 to the rectifying unit 118, and output the second local oscillator signal LO2 to the mixing sub-circuit 13. The rectifying unit 118 is configured to convert the first local oscillator signal LO1 into a DC level DC, and output it to the amplifying sub-circuit 15. The third isolator 122 is connected between the first coupler 121 and the mixing sub-circuit 13, and is configured to unidirectionally transmit the second local oscillator signal LO2. The fourth isolator 123 is connected between the first coupler 121 and the rectifying unit 118, and is configured to unidirectionally transmit the first local oscillator signal LO1.

[0105] Specifically, the first coupler 121 couples the local oscillator signal LO into a first local oscillator signal LO1 and a second local oscillator signal LO2, wherein the first local oscillator signal LO1 is provided to the rectifying unit 118 as radio frequency energy, and the second local oscillator signal LO2 is output to the mixing subcircuit 13 for mixing with the third frequency band signal IF. The rectifying unit 118 rectifies the first local oscillator signal LO1 separated by the first coupler 121 into a direct current level DC, and outputs it to the amplifying subcircuit 15. The third isolator 122 is used for the second local oscillator signal LO2 generated by the first coupler 121 for mixing by the mixing subcircuit 13, so that the second local oscillator signal LO2 can be transmitted unidirectionally. After such a setting, the third frequency band signal IF and the 2.6 GHz signal leaked in the mixing subcircuit 13 will not leak back through the first coupler 121, nor will it affect the direct current level DC generated by the rectifying unit 118. The fourth isolator 123 is used for the first local oscillator signal LO1 generated by the first coupler 121 for energy collection by the collection subcircuit 14, so that the first local oscillator signal LO1 can be transmitted unidirectionally. After this setting, the collection subcircuit 14 and the mixing subcircuit 13 can be further isolated, which helps to improve the intermodulation characteristics of the mixing signal.

[0106] Figure 8a is a schematic diagram of the principle of the first power divider 117; Figure 8b is a schematic diagram of the principle of the first coupler 121, as shown in Figure 8a and Figure 8b As shown, the two output insertion losses of the first power divider 117 are the same, while the two output insertion losses of the first coupler 121 are different. Specifically, the insertion loss of one output of the first coupler 121 is smaller, and the insertion loss of the other output is larger. Figure 7In the third embodiment of the collection subcircuit 14 shown in FIG. 1 , the first coupler 121 is used to replace the first power divider 117 for power distribution. Furthermore, the first coupler 121 is used to output an output signal with a smaller insertion loss (the second local oscillator signal LO2) for mixing, and the first coupler 121 is used to output an output signal with a larger insertion loss (the first local oscillator signal LO1) for energy collection. Compared with the above configuration, Figure 5 The first embodiment of the acquisition subcircuit 14 shown and Figure 6 For the second embodiment of the acquisition subcircuit 14 shown, it is possible to reduce the loss of the second local oscillator signal LO2 required for mixing on the basis of meeting the power consumption requirement of RF energy acquisition, thereby ensuring the indicators of the mixing subcircuit 13. At the same time, such a setting can also avoid the phenomenon that the frequency conversion loss of the mixing subcircuit 13 increases and the nonlinear indicators are greatly deteriorated when the power of the second local oscillator signal LO2 is insufficient.

[0107] Fourth embodiment: Fig. 9 FIG. 1 is a circuit structure diagram of a fourth embodiment of the acquisition subcircuit 14 of the frequency conversion circuit in the embodiment of the present disclosure, as shown in FIG. Fig. 9 As shown, the acquisition subcircuit 14 in this embodiment is composed of a coupler, a rectifier unit 118, two isolators and a linear regulator. Since the functions of the coupler, the rectifier unit 118 and the isolator are the same as those of the coupler, the rectifier unit 118 and the isolator in the third embodiment, the coupler is also referred to as the first coupler 121, and the two isolators are respectively referred to as the third isolator 122 and the fourth isolator 123.

[0108] The first coupler 121 is configured to divide the local oscillator signal LO into a first local oscillator signal LO1 and a second local oscillator signal LO2, and output the first local oscillator signal LO1 to the rectifying unit 118, and output the second local oscillator signal LO2 to the mixing subcircuit 13. The rectifying unit 118 is configured to convert the first local oscillator signal LO1 into a DC level DC, and output it to the linear regulator. The third isolator 122 is connected between the first coupler 121 and the mixing subcircuit 13, and is configured to unidirectionally transmit the second local oscillator signal LO2. The fourth isolator 123 is connected between the first coupler 121 and the rectifying unit 118, and is configured to unidirectionally transmit the first local oscillator signal LO1. The linear regulator is connected between the rectifying unit 118 and the amplifying subcircuit 15, and is configured to stabilize the DC level DC output by the rectifying unit 118.

[0109] Specifically, the first coupler 121 couples the local oscillator signal LO into a first local oscillator signal LO1 and a second local oscillator signal LO2, wherein the first local oscillator signal LO1 is provided to the rectifier unit 118 as radio frequency energy, and the second local oscillator signal LO2 is output to the mixer subcircuit 13 for mixing with the third frequency band signal IF. The rectifier unit 118 rectifies the first local oscillator signal LO1 separated by the first coupler 121 into a direct current level DC, and outputs it to the linear regulator. The third isolator 122 is used for the second local oscillator signal LO2 generated by the first coupler 121 for mixing by the mixer subcircuit 13, so that the second local oscillator signal LO2 can be transmitted unidirectionally. After such a setting, the third frequency band signal IF and the 2.6 GHz signal leaked in the mixer subcircuit 13 will not leak back through the first coupler 121, nor will it affect the direct current level DC generated by the rectifier unit 118. The fourth isolator 123 is used for the first local oscillator signal LO1 generated by the first coupler 121 for energy collection by the collection subcircuit 14, so that the first local oscillator signal LO1 can be transmitted unidirectionally. After this setting, the collection subcircuit 14 and the mixing subcircuit 13 can be further isolated, which helps to improve the intermodulation characteristics of the mixing signal.

[0110] Specifically, the linear regulator includes but is not limited to a low-dropout linear regulator (LDO). For ease of description and understanding, the linear regulator in the disclosed embodiment is described by taking a low-dropout linear regulator as an example. It should be noted that LDO is a linear regulator with a low voltage difference between the input voltage and the output voltage. There are two basic forms of linear regulators: a series regulator and a shunt regulator. LDO is a series regulator that is located between the power supply and the load, and adjusts the resistance of the variable resistor according to the change of the input voltage or the output current to keep the output voltage stable. When the LDO output is fixed, as long as its supply voltage is greater than the differential voltage of its output value, stable power supply can be achieved.

[0111] In the frequency conversion circuit in the embodiment of the present disclosure, by setting an LDO in the acquisition sub-circuit 14, the DC level DC output by the rectifier unit 118 can be secondary stabilized and the power supply ripple can be filtered out, thereby avoiding the additional spurious signals caused by ripple jitter when the 2.6GHz signal generated by the mixing passes through the amplification sub-circuit 15, thereby avoiding affecting the adjacent channel power ratio (ACPR), vector amplitude error (EVM) and other non-linear indicators of the entire circuit.

[0112] In some embodiments, the rectifier unit 118 includes a rectifier diode or a rectifier MOS tube. For example, the rectifier unit 118 in the first embodiment, the second embodiment, the third embodiment and the fourth embodiment of the acquisition subcircuit 14 of the frequency conversion circuit in the embodiment of the present disclosure all adopts a rectifier diode.

[0113] The fifth embodiment: Fig.10 FIG. 1 is a schematic diagram of the circuit structure of a fifth embodiment of the acquisition subcircuit 14 of the frequency conversion circuit in the embodiment of the present disclosure, as shown in FIG. Fig.10 As shown, the acquisition subcircuit 14 in this embodiment is composed of a coupler, a rectifier unit 118, two isolators and a linear regulator. Since the functions of the coupler, the rectifier unit 118, the isolator and the linear regulator are the same as those of the coupler, the rectifier unit 118, the isolator and the linear regulator in the fourth embodiment, the coupler is also referred to as the first coupler 121, the two isolators are respectively referred to as the third isolator 122 and the fourth isolator 123, and the linear regulator adopts LDO.

[0114] In the frequency conversion circuit of the embodiment of the present disclosure, the rectifying unit 118 of the acquisition subcircuit 14 adopts a rectifying MOS tube. Such a setting can prevent the amplitude of the second local oscillator signal LO2 input to the rectifying unit 118 from increasing, resulting in a decrease in the voltage sensitivity of the rectifying unit 118, thereby improving the sensitivity of the rectifying unit 118 and improving the efficiency of energy conversion.

[0115] Next, a specific embodiment of the frequency mixing sub-circuit 13 in the embodiment of the present disclosure is described.

[0116] First embodiment: Fig.11 FIG. 1 is a schematic diagram of a circuit structure of a first embodiment of the frequency mixing subcircuit 13 of the frequency conversion circuit in the embodiment of the present disclosure, as shown in FIG. Fig.11 As shown, the mixing subcircuit 13 in this embodiment is composed of an IQ mixer 131, three matching baluns and a dielectric filter. For the convenience of description and to distinguish from other embodiments, the three matching baluns are respectively referred to as the first matching balun 132, the second matching balun 133 and the third matching balun 134, and the dielectric filter is referred to as the second dielectric filter 135.

[0117] Among them, the first matching balun 132 is configured to impedance match the third frequency band signal IF and the two signals required by the IQ mixer 131, the second matching balun 133 is configured to impedance match the second local oscillator signal LO2 and the two signals required by the IQ mixer 131, the third matching balun 134 is configured to impedance match the two signals output by the IQ mixer 131 and the second dielectric filter 135, and the second dielectric filter 135 is configured to filter the initial second RF signal output by the third matching balun 134, and output the second RF signal to the amplification sub-circuit 15.

[0118] Specifically, the IQ mixer 131 is a double-balanced IQ mixer 131, which is configured to receive a differential signal and output a differential signal. The first matching balun 132 performs impedance matching between the third frequency band signal IF and the two differential signals required by the IQ mixer 131, the second matching balun 133 performs impedance matching between the second local oscillator signal LO2 and the two differential signals required by the IQ mixer 131, the third matching balun 134 performs impedance matching between the two differential signals output by the IQ mixer 131 and the second dielectric filter 135, the second dielectric filter 135 filters the initial second RF signal output by the third matching balun 134, and outputs a 2.6 GHz 5G RF signal to the amplification sub-circuit 15.

[0119] In the frequency conversion circuit of the embodiment of the present disclosure, a double-balanced IQ mixer 131 is used to convert the third frequency band signal IF and the second local oscillator signal LO2 to generate a 2.6 GHz signal. The double-balanced IQ mixer 131 can achieve the best combination of isolation, linearity and noise coefficient, improve image suppression, and ensure the nonlinear performance of the system. At the same time, the second dielectric filter 135 is used to filter the 2.6 GHz frequency band signal generated by the frequency conversion, filter out the out-of-band spurious signals generated by the mixing, and ensure the communication quality.

[0120] Furthermore, the second dielectric filter 135 in the embodiment of the present disclosure includes but is not limited to a LTCC filter.

[0121] Second embodiment: Fig.12 FIG. 1 is a schematic diagram of a circuit structure of a second embodiment of the frequency mixing subcircuit 13 of the frequency conversion circuit in the embodiment of the present disclosure, as shown in FIG. Fig.12 As shown, the mixing subcircuit 13 in this embodiment includes a non-IQ mixer 136 and a dielectric filter. Since the function of the dielectric filter is the same as that of the second dielectric filter 135 in the first embodiment, the dielectric filter is also referred to as the second dielectric filter 135.

[0122] Among them, the non-IQ mixer 136 is configured to mix the third frequency band signal IF and the second local oscillator signal LO2 to output an initial second RF signal; the second dielectric filter 135 is configured to filter the initial second RF signal and output the second RF signal (2.6GHz 5G RF signal) to the amplification sub-circuit 15.

[0123] In the frequency conversion circuit of the embodiment of the present disclosure, a non-IQ mixer 136 is used. Compared with the above configuration, Fig.11 For the first embodiment of the mixing subcircuit 13 shown, the matching balun can be removed. The matching balun is prone to mismatching to varying degrees due to various reasons during actual wiring, which increases the loss. Therefore, replacing the IQ mixer 131 with a non-IQ mixer 136 can reduce the frequency conversion loss to a certain extent. At the same time, the second dielectric filter 135 is used to filter the 2.6GHz frequency band signal generated by the frequency conversion, filter out the out-of-band spurious signals generated by the mixing, and ensure the communication quality.

[0124] Furthermore, the second dielectric filter 135 in the embodiment of the present disclosure includes but is not limited to a LTCC filter.

[0125] Finally, a specific embodiment of the amplifying sub-circuit 15 in the embodiment of the present disclosure is described.

[0126] Fig.13 FIG. 1 is a schematic diagram of a circuit structure of an embodiment of the amplifier sub-circuit 15 of the frequency conversion circuit in the embodiment of the present disclosure, as shown in FIG. Fig.13 As shown, the amplifier subcircuit 15 in the embodiment of the present disclosure includes an amplifier, which can be a low noise amplifier (LNA). The amplifier subcircuit 15 amplifies the 2.6 GHz signal generated by the mixing subcircuit 13, thereby reducing the frequency conversion loss.

[0127] In a second aspect, the embodiment of the present disclosure further provides an antenna system, which includes the frequency conversion circuit of any one of the above embodiments, and the signal source of the antenna system is provided by the frequency conversion circuit. The antenna system in the embodiment of the present disclosure may specifically be a DAS.

[0128] In some embodiments, the antenna system includes not only a signal source, but also a transmission medium and an antenna unit. The signal source is connected to the antenna unit via the transmission medium. In the embodiment of the present disclosure, the antenna unit may specifically include a first antenna unit and a second antenna unit, the first antenna unit is configured to transmit a first radio frequency signal, and the second antenna unit is configured to transmit a third radio frequency signal.

[0129] In some embodiments, the first antenna unit includes any one of a directional antenna, an omnidirectional antenna, a horizontal plane antenna, a MIMO antenna, and a boost antenna.

[0130] In some embodiments, the second antenna unit includes any one of a directional antenna, an omnidirectional antenna, a horizontal plane antenna, a MIMO antenna, and a boost antenna.

[0131] Furthermore, the transmission medium may be a coaxial cable, an optical cable, a LAN, or the like.

[0132] In some embodiments, the antenna system is a passive distributed antenna (Passive DAS), which is mainly used in small buildings and spaces. Only coaxial cables are used to transmit the RF signal of the base station or repeater to the antenna unit. The electronic components used include: splitters, combiners, attenuators, dummy loads, circulators, filters, and couplers.

[0133] In some embodiments, the antenna system may be a transceiver antenna, that is, it can realize both the transmission of electromagnetic wave signals and the reception of electromagnetic wave signals. Of course, the antenna system is not limited to the above structure, but also includes a transceiver unit, a radio frequency transceiver, a signal amplifier, a power amplifier, and a filter unit. The antenna in the communication device can be used as a transmitting antenna or a receiving antenna. Among them, the transceiver unit may include a baseband and a receiving end, and the baseband provides a signal of at least one frequency band, for example, 2G signals, 3G signals, 4G signals, 5G signals, etc., and sends a signal of at least one frequency band to the radio frequency transceiver. After the antenna in the communication system receives the signal, it can be processed by the filter unit, the power amplifier, the signal amplifier, and the radio frequency transceiver and then transmitted to the receiving end in the transceiver unit (for example, the receiving end can be a smart gateway, etc.).

[0134] Furthermore, the RF transceiver is connected to the transceiver unit, and is used to modulate the signal sent by the transceiver unit, or to demodulate the signal received by the antenna and transmit it to the transceiver unit. Specifically, the RF transceiver may include a transmitting circuit, a receiving circuit, a modulation circuit, and a demodulation circuit. After the transmitting circuit receives various types of signals provided by the baseband, the modulation circuit can modulate the various types of signals provided by the baseband and then send them to the antenna. The antenna receives the signal and transmits it to the receiving circuit of the RF transceiver. The receiving circuit transmits the signal to the demodulation circuit, and the demodulation circuit demodulates the signal and transmits it to the receiving end.

[0135] Furthermore, the RF transceiver is connected to a signal amplifier and a power amplifier, and the signal amplifier and the power amplifier are connected to a filter unit, and the filter unit is connected to at least one antenna. In the process of sending signals in the communication system, the signal amplifier is used to improve the signal-to-noise ratio of the signal output by the RF transceiver and then transmit it to the filter unit; the power amplifier is used to amplify the power of the signal output by the RF transceiver and then transmit it to the filter unit; the filter unit may specifically include a duplexer and a filter circuit, and the filter unit combines the signals output by the signal amplifier and the power amplifier and filters out the clutter before transmitting them to the antenna, and the antenna radiates the signal. In the process of receiving signals in the communication system, the antenna receives the signal and transmits it to the filter unit, and the filter unit filters out the clutter from the signal received by the antenna and then transmits it to the signal amplifier and the power amplifier, and the signal amplifier amplifies the signal received by the antenna to increase the signal-to-noise ratio; the power amplifier amplifies the power of the signal received by the antenna. The signal received by the antenna is processed by the power amplifier and the signal amplifier and then transmitted to the RF transceiver, and the RF transceiver then transmits it to the transceiver unit.

[0136] In some embodiments, the signal amplifier may include various types of signal amplifiers, such as a low noise amplifier, which is not limited herein.

[0137] In some embodiments, the antenna system provided by the embodiments of the present disclosure further includes a power management unit, which is connected to a power amplifier to provide the power amplifier with a voltage for amplifying a signal.

[0138] In a third aspect, an embodiment of the present disclosure further provides an electronic device, which includes the antenna system of any one of the above embodiments.

[0139] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A frequency conversion circuit, comprising an input terminal, a first output terminal and a second output terminal; the frequency conversion circuit comprises a frequency selection subcircuit, a combining subcircuit, a mixing subcircuit, a collection subcircuit and an amplification subcircuit; wherein, The frequency selection subcircuit is configured to select the radio frequency signal input from the input end into a first frequency band signal, a second frequency band signal, a third frequency band signal and a local oscillator signal according to the frequency; the frequency of the third frequency band signal is between the frequencies of the first frequency band signal and the second frequency band signal; The combining sub-circuit is configured to combine the first frequency band signal and the second frequency band signal, and output a first radio frequency signal through the first output terminal, wherein the first radio frequency signal at least includes a radio frequency signal of a specific frequency band; The acquisition subcircuit is configured to divide the local oscillator signal into a first local oscillator signal and a second local oscillator signal, and convert the first local oscillator signal into a DC level and output it to the amplification subcircuit; The mixing subcircuit is configured to mix the third frequency band signal and the second local oscillator signal to generate a second radio frequency signal, and output the second radio frequency signal to the amplifying subcircuit; the second radio frequency signal is a radio frequency signal of a specific frequency band; The amplifying subcircuit is configured to amplify the second RF signal to generate a third RF signal according to the DC level output by the collecting subcircuit, and output the third RF signal through the second output terminal.

2. The frequency conversion circuit according to claim 1, wherein: The frequency selection subcircuit includes a first duplexer, a second duplexer, a matching circuit and a first dielectric filter; The first duplexer has a first RF channel and a second RF channel, the first RF channel is configured to output the first frequency band signal, the third frequency band signal and the initial local oscillator signal among the RF signals inputted from the input end, and the second RF channel is configured to output the second frequency band signal among the RF signals inputted from the input end; The second duplexer has a third RF channel and a fourth RF channel, the third RF channel and the fourth RF channel are both connected to the first RF channel, the third RF channel is configured to output a first frequency band signal, and the fourth RF channel is configured to output a third frequency band signal; The matching circuit is configured to perform impedance matching on the first dielectric filter and the second duplexer; The first dielectric filter is configured to filter the initial local oscillator signal and output the local oscillator signal.

3. The frequency conversion circuit according to claim 1, wherein: The frequency selection subcircuit includes a first duplexer and a dielectric triplexer; The first duplexer has a first RF channel and a second RF channel, the first RF channel is configured to output the first frequency band signal, the third frequency band signal and the local oscillator signal among the RF signals inputted from the input end, and the second RF channel is configured to output the second frequency band signal among the RF signals inputted from the input end; The dielectric triplexer has a fifth RF channel, a sixth RF channel and a seventh RF channel. The fifth RF channel, the sixth RF channel and the seventh RF channel are all connected to the first RF channel and are respectively configured to output the first frequency band signal, the third frequency band signal and the local oscillator signal.

4. The frequency conversion circuit according to claim 1, wherein: The frequency selection subcircuit includes a dielectric quadplexer, and the dielectric quadplexer has an eighth radio frequency channel, a ninth radio frequency channel, a tenth radio frequency channel, and an eleventh radio frequency channel; The eighth RF channel, the ninth RF channel, the tenth RF channel and the eleventh RF channel are respectively configured to perform frequency selection on the RF signal input by the input end, and output the first frequency band signal, the second frequency band signal, the third frequency band signal and the local oscillator signal.

5. The frequency conversion circuit according to claim 1, wherein: The combining subcircuit includes a duplexer.

6. The frequency conversion circuit according to claim 1, wherein: The acquisition subcircuit includes a first power divider and a rectifier unit; The first power divider is configured to divide the local oscillator signal into a first local oscillator signal and a second local oscillator signal, and output the first local oscillator signal to the rectifying unit, and output the second local oscillator signal to the mixing sub-circuit; The rectifying unit is configured to convert the first local oscillator signal into a direct current level and output the direct current level to the amplifying sub-circuit.

7. The frequency conversion circuit according to claim 6, wherein: The acquisition subcircuit also includes a first isolator and a second isolator; The first isolator is connected between the first power divider and the mixing sub-circuit and is configured to transmit the second local oscillator signal unidirectionally; The second isolator is connected between the first power divider and the rectifying unit, and is configured to transmit the first local oscillator signal unidirectionally.

8. The frequency conversion circuit according to claim 1, wherein: The acquisition subcircuit includes a first coupler, a third isolator, a fourth isolator and a rectifying unit; The first coupler is configured to divide the local oscillator signal into a first local oscillator signal and a second local oscillator signal, and output the first local oscillator signal to the rectifying unit, and output the second local oscillator signal to the mixing sub-circuit; The rectifying unit is configured to convert the first local oscillator signal into a DC level and output it to the amplifying sub-circuit; The third isolator is connected between the first coupler and the mixing sub-circuit and is configured to transmit the second local oscillator signal unidirectionally; The fourth isolator is connected between the first coupler and the rectifying unit, and is configured to transmit the first local oscillator signal unidirectionally.

9. The frequency conversion circuit according to claim 8, wherein: The acquisition subcircuit also includes a linear voltage regulator; The linear regulator is connected between the rectifying unit and the amplifying sub-circuit, and is configured to stabilize the DC level output by the rectifying unit.

10. The frequency conversion circuit according to any one of claims 6 to 9, wherein: The rectifying unit includes a rectifying diode or a rectifying MOS tube.

11. The frequency conversion circuit according to claim 1, wherein: The mixing subcircuit includes an IQ mixer, a first matching balun, a second matching balun, a third matching balun and a second dielectric filter; The first matching balun is configured to perform impedance matching between the third frequency band signal and the two signals required by the IQ mixer; The second matching balun is configured to perform impedance matching between the second local oscillator signal and two signals required by the IQ mixer; The third matching balun is configured to perform impedance matching between the two signals output by the IQ mixer and the second dielectric filter; The second dielectric filter is configured to filter the initial second radio frequency signal output by the third matching balun, and output the second radio frequency signal to the amplifying sub-circuit.

12. The frequency conversion circuit according to claim 1, wherein: The mixing subcircuit includes a non-IQ mixer and a second dielectric filter; The non-IQ mixer is configured to mix the third frequency band signal with the second local oscillator signal to output an initial second radio frequency signal; The second dielectric filter is configured to filter the initial second radio frequency signal and output the second radio frequency signal to the amplifying sub-circuit.

13. The frequency conversion circuit according to claim 1, wherein: The amplification subcircuit includes a low noise amplifier.

14. The frequency conversion circuit according to claim 1, wherein: The radio frequency signal in the specific frequency band is a 5G radio frequency signal.

15. An antenna system, comprising the frequency conversion circuit according to any one of claims 1 to 14.

16. The antenna system according to claim 15, wherein: The system further includes a first antenna unit and a second antenna unit, wherein the first antenna unit is configured to transmit the first radio frequency signal, and the second antenna unit is configured to transmit the third radio frequency signal.

17. The antenna system according to claim 16, wherein: The first antenna unit includes any one of a directional antenna, an omnidirectional antenna, a horizontal plane antenna, a MIMO antenna, and a gain antenna.

18. The antenna system according to claim 16, wherein: The second antenna unit includes any one of a directional antenna, an omnidirectional antenna, a horizontal plane antenna, a MIMO antenna, and a gain antenna.

19. The antenna system according to claim 16, wherein: The antenna system comprises a distributed antenna system.

20. An electronic device comprising the antenna system according to any one of claims 15 to 19.

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