Passive frequency conversion circuit, multiple-input multiple-output signal transmission apparatus, and antenna

Abstract

Provided in the present disclosure are a passive frequency conversion circuit, a multiple-input multiple-output signal transmission apparatus, and an antenna. The passive frequency conversion circuit comprises a frequency division circuit, a pass-through circuit and a frequency mixing circuit. The frequency division circuit is electrically connected to both the pass-through circuit and the frequency mixing circuit. The frequency division circuit is configured to receive an input of an external signal and perform frequency division on the external signal to obtain pass-through signals and / or multiple frequency-converted signals. The maximum input power of the frequency division circuit is greater than or equal to 38 dBm. The pass-through circuit is configured to receive the pass-through signals and output same. The pass-through signals comprise signals of at least one frequency band. The frequency mixing circuit is configured to receive the multiple frequency-converted signals, perform frequency mixing on the multiple frequency-converted signals to obtain a frequency-mixed signal, and then output the frequency-mixed signal. The frequency band of the frequency-mixed signal is the same as the frequency band of at least some signals among the pass-through signals. The present disclosure is conducive to reducing the construction cost of outdoor coverage of a 5G MIMO network and shorten the construction period.

Description

Passive frequency conversion circuit, multiple-input multiple-output signal transmission device and antenna

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese Patent Application No. 202410683753.0, filed on May 29, 2024, and entitled “Passive frequency conversion circuit, multiple-input multiple-output signal transmission device and antenna”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of wireless communication, and in particular to a passive frequency conversion circuit, a multiple-input multiple-output signal transmission device and an antenna. BACKGROUND

[0004] There are still problems of high deployment cost and difficult coverage in current outdoor coverage of the 5th Generation Mobile Communication Technology (5G) network. One reason is that when the original single-path network equipment is transformed into a 5G multiple-input multiple-output (MIMO) network, the original single-path network equipment needs to be completely replaced, which requires a large investment in hardware cost and time cost. How to realize the outdoor coverage of the 5G MIMO network based on the original single-path network equipment has become a hot research issue. SUMMARY

[0005] The present disclosure provides a passive frequency conversion circuit, a multiple-input multiple-output signal transmission device and an antenna to reduce the cost of outdoor coverage of the 5G MIMO network.

[0006] In a first aspect, the present disclosure provides a passive frequency conversion circuit, comprising: a frequency division circuit, a pass-through circuit and a frequency mixing circuit; the frequency division circuit is electrically connected with the pass-through circuit and the frequency mixing circuit respectively.

[0007] The frequency division circuit is configured to receive an input of an external signal and divide the external signal into a pass-through signal and / or a multiple-path frequency conversion signal; the maximum input power of the frequency division circuit is greater than or equal to 38dBm.

[0008] The pass-through circuit is configured to receive the pass-through signal and output the pass-through signal; the pass-through signal comprises a signal of at least one frequency band.

[0009] The frequency mixing circuit is configured to receive the multiple-path frequency conversion signal, mix the multiple-path frequency conversion signal into a frequency mixing signal and then output the frequency mixing signal; the frequency band of the frequency mixing signal is the same as that of at least part of the signals in the pass-through signal.

[0010] The passive frequency conversion circuit provided by the present disclosure comprises a frequency division circuit, a first shunt, and a transmissive circuit.

[0011] The input duplex is configured to receive an external signal and divide the external signal into a first frequency band signal and / or a second frequency band signal; the maximum input power of the input duplex is greater than or equal to 38dBm.

[0012] The first frequency band signal is output from the input duplex to the transmissive circuit; the first frequency band signal is a transmissive signal.

[0013] The second frequency band signal is output from the input duplex to the first shunt.

[0014] The second frequency band signal comprises a frequency conversion signal; the frequency conversion signal is output from the first shunt to the frequency mixing circuit.

[0015] The passive frequency conversion circuit provided by the present disclosure further comprises a transmissive circuit electrically connected to the first shunt.

[0016] The second frequency band signal further comprises a transmissive signal; the transmissive signal in the second frequency band signal is output from the first shunt to the transmissive circuit.

[0017] The passive frequency conversion circuit provided by the present disclosure comprises a transmissive circuit which is a metal cavity duplex.

[0018] The passive frequency conversion circuit provided by the present disclosure comprises a first shunt which is a triplexer; the frequency mixing circuit is a three-port frequency mixer.

[0019] The first shunt is electrically connected to the frequency mixing circuit through the plurality of filters.

[0020] The passive frequency conversion circuit provided by the present disclosure further comprises a plurality of filters.

[0021] The plurality of filters are arranged on a plurality of signal lines between the first shunt and the frequency mixing circuit; the first shunt is electrically connected to the frequency mixing circuit through the plurality of filters.

[0022] The passive frequency conversion circuit provided by the present disclosure comprises an input duplex which is a metal cavity duplex.

[0023] The passive frequency conversion circuit provided by the present disclosure comprises a frequency division circuit, a second shunt, a third shunt, a fourth shunt, and a fifth shunt.

[0024] The power divider is electrically connected with the second shunt and the third shunt respectively; the second shunt is further electrically connected with the transparent circuit and the fourth shunt respectively; the fourth shunt is further connected with the frequency mixing circuit in multiple ways; the third shunt is further electrically connected with the transparent circuit and the fifth shunt respectively; the fifth shunt is further connected with the frequency mixing circuit in multiple ways;

[0025] The power divider is configured to receive an external signal, divide the external signal into a first power signal and a second power signal; the frequency band of the first power signal and the frequency band of the second power signal are the same as the frequency band of the received external signal, and the power of the first power signal and the power of the second power signal are both less than the power of the external signal; the maximum input power of the power divider is greater than or equal to 38dBm;

[0026] The second shunt is configured to receive the first power signal and divide the first power signal into a first frequency band signal and / or a second frequency band signal; the third shunt is configured to receive the second power signal and divide the second power signal into a first frequency band signal and / or a second frequency band signal;

[0027] The first frequency band signal is output by the second shunt and the third shunt to the transparent circuit respectively; the first frequency band signal is a transparent signal;

[0028] The second frequency band signal is output by the second shunt to the fourth shunt and by the third shunt to the fifth shunt respectively;

[0029] The second frequency band signal includes a frequency conversion signal; the frequency conversion signal is output by the fourth shunt in multiple ways to the frequency mixing circuit and by the fifth shunt in multiple ways to the frequency mixing circuit.

[0030] In the passive frequency conversion circuit provided by the present disclosure, the second shunt and the third shunt are both low-temperature co-fired ceramic duplexers or dielectric duplexers.

[0031] In the passive frequency conversion circuit provided by the present disclosure, the fourth shunt and the fifth shunt are further electrically connected with the transparent circuit respectively;

[0032] The second frequency band signal further includes a transparent signal; the transparent signal in the second frequency band signal is output by the fourth shunt and the fifth shunt to the transparent circuit respectively.

[0033] In the passive frequency conversion circuit provided by the present disclosure, the transparent circuit is a cavity combiner.

[0034] In the passive frequency conversion circuit provided by the present disclosure, the fourth shunt and the fifth shunt are both triplexers; the triplexer is a low-temperature co-fired ceramic triplexer;

[0035] The fourth and fifth splitters are each split into two paths and electrically connected to the mixer circuit; the frequency conversion signal is split into two paths by the fourth splitter and output to the mixer circuit, and the signal is split into two paths by the fifth splitter and output to the mixer circuit.

[0036] In the passive frequency converter circuit provided in this disclosure, the frequency divider circuit also includes a first combiner and a second combiner;

[0037] The second and third splitters are electrically connected to the first combiner, and are also electrically connected to the transparent circuit through the first combiner; the fourth and fifth splitters are electrically connected to the second combiner, and are also electrically connected to the transparent circuit through the second combiner.

[0038] The first combiner is configured to receive first-band signals from the second splitter and the third splitter respectively, combine them into one signal and output it to the transparent transmission circuit;

[0039] The second combiner is configured to receive transparent signals from the fourth splitter and the fifth splitter respectively, combine them into one signal, and output it to the transparent circuit.

[0040] In the passive frequency converter circuit provided in this disclosure, the frequency divider circuit further includes multiple third combiners; each of the multiple third combiners is electrically connected to the fourth splitter, the fifth splitter, and the mixer circuit, respectively.

[0041] Each third combiner is configured to combine one of the multiple frequency conversion signals output from the fourth splitter with one of the multiple frequency conversion signals output from the fifth splitter into a single frequency conversion signal, and output it to the mixer circuit.

[0042] A mixing circuit includes a mixer.

[0043] In the passive frequency converter circuit provided in this disclosure, the mixing circuit includes a mixer and a plurality of third combiners; each of the plurality of third combiners is electrically connected to a fourth splitter, a fifth splitter and the mixer, respectively.

[0044] Each third combiner is configured to combine one of the multiple frequency conversion signals output from the fourth splitter and one of the multiple frequency conversion signals output from the fifth splitter into a single frequency conversion signal, which is then output to the mixer.

[0045] The passive frequency converter circuit provided in this disclosure also includes multiple filters; the multiple filters are respectively disposed on the multi-signal lines between the fourth splitter and the mixer circuit, and respectively disposed on the multi-signal lines between the fifth splitter and the mixer circuit. The fourth splitter and the fifth splitter are electrically connected to the mixer circuit through the filters.

[0046] In the passive frequency converter circuit disclosed herein, the power divider is a cavity power divider.

[0047] The passive frequency conversion circuit provided by the present disclosure includes a frequency division circuit, a pass-through circuit, and a frequency mixing circuit.

[0048] The attenuator is electrically connected to the sixth shunt, and the sixth shunt is electrically connected to the seventh shunt and the pass-through module.

[0049] The attenuator is configured to receive an external signal and output the attenuated external signal to the sixth shunt.

[0050] The sixth shunt is configured to divide the attenuated external signal into a first frequency band signal and / or a second frequency band signal.

[0051] The first frequency band signal is output from the sixth shunt to the pass-through module, and the first frequency band signal is a pass-through signal; the first amplifier is configured to receive the pass-through signal output by the pass-through module and output the amplified pass-through signal.

[0052] The second frequency band signal is output from the sixth shunt to the seventh shunt.

[0053] The second frequency band signal includes a frequency conversion signal; the frequency conversion signal is output from the seventh shunt to the frequency mixing module; and the second amplifier is configured to receive the frequency mixing signal output by the frequency mixing module and output the amplified frequency mixing signal.

[0054] In the passive frequency conversion circuit provided by the present disclosure, the seventh shunt is also electrically connected to the pass-through module.

[0055] The second frequency band signal also includes a pass-through signal, and the pass-through signal in the second frequency band signal is output from the seventh shunt to the pass-through module.

[0056] In the passive frequency conversion circuit provided by the present disclosure, the pass-through module is a low-temperature co-fired ceramic duplexer or a dielectric duplexer.

[0057] In the passive frequency conversion circuit provided by the present disclosure, the seventh shunt is a triplexer; the triplexer is a low-temperature co-fired ceramic triplexer; and the frequency mixing module is a three-port frequency mixer.

[0058] The seventh shunt is electrically connected to the frequency mixing module in two paths; and the frequency conversion signal is output from the seventh shunt to the frequency mixing module in two paths.

[0059] The passive frequency conversion circuit provided by the present disclosure further includes a plurality of filters.

[0060] The plurality of filters are arranged on a plurality of signal lines between the seventh shunt and the frequency mixing module, and the seventh shunt is electrically connected to the frequency mixing module through the filters.

[0061] The passive frequency converter circuit provided in this disclosure also includes a coupler and a rectifier;

[0062] The coupler is located before the attenuator; the coupler is electrically connected to both the attenuator and the rectifier; the rectifier is also electrically connected to both the first amplifier and the second amplifier.

[0063] The coupler is configured to receive an external signal and transmit part of the external signal to the attenuator and part of it to the rectifier.

[0064] The rectifier is configured to rectify the signal current coupled out of the coupler into DC current and output it to the first amplifier and the second amplifier, respectively.

[0065] The passive frequency converter circuit provided in this disclosure also includes a coupler and a rectifier;

[0066] The coupler is located between the attenuator and the sixth splitter; the coupler is electrically connected to the attenuator, the sixth splitter and the rectifier respectively; the rectifier is also electrically connected to the first amplifier and the second amplifier respectively;

[0067] The coupler is configured to receive the external signal output from the attenuator and transmit part of the external signal to the sixth splitter and part of it to the rectifier;

[0068] The rectifier is configured to rectify the signal current coupled out of the coupler into DC current and output it to the first amplifier and the second amplifier, respectively.

[0069] In the passive frequency converter circuit provided in this disclosure, the frequency of the first frequency band signal is greater than the frequency of the second frequency band signal.

[0070] The frequency of the frequency conversion signal is greater than the frequency of the transparent signal in the second frequency band.

[0071] A second aspect of this disclosure provides a multiple-input multiple-output signal transmission device, including an external signal transmission cable, a first antenna unit, a second antenna unit, and a passive frequency conversion circuit of any one of the above.

[0072] The external signal transmission cable is electrically connected to the frequency divider circuit of the passive frequency converter; the external signal transmission cable is configured to input external signals to the frequency divider circuit.

[0073] The first antenna unit is electrically connected to the pass-through circuit of the passive frequency converter circuit; the first antenna unit is configured to receive the pass-through signal output by the pass-through circuit and send electromagnetic wave signals to the outside world.

[0074] The second antenna unit is electrically connected to the mixer circuit of the passive frequency converter circuit; the second antenna unit is configured to receive the mixer signal output by the mixer circuit and send electromagnetic wave signals to the outside world.

[0075] In a third aspect of the present disclosure, an antenna is provided, comprising a first antenna unit, a second antenna unit, and the passive frequency conversion circuit of any one of the above;

[0076] The first antenna unit is electrically connected to the transparent transmission circuit of the passive frequency conversion circuit; the first antenna unit is configured to receive the transparent transmission signal output by the transparent transmission circuit and transmit electromagnetic wave signals to the outside world;

[0077] The second antenna unit is electrically connected to the mixing circuit of the passive frequency conversion circuit; the second antenna unit is configured to receive the mixed frequency signal output by the mixing circuit and transmit electromagnetic wave signals to the outside world.

[0078] The present disclosure has the following advantages:

[0079] The present disclosure provides a passive frequency conversion circuit, a multiple-input and multiple-output signal transmission device, and an antenna. The passive frequency conversion circuit comprises a frequency division circuit, a transparent transmission circuit, and a mixing circuit. The frequency division circuit is electrically connected to the transparent transmission circuit and the mixing circuit, respectively. The frequency division circuit is configured to receive an input of an external signal and divide the external signal into a transparent transmission signal and / or a multiple-path frequency conversion signal. The maximum input power of the frequency division circuit is greater than or equal to 38 dBm. The transparent transmission circuit is configured to receive the transparent transmission signal and output the transparent transmission signal. The transparent transmission signal comprises signals of at least one frequency band. The mixing circuit is configured to receive the multiple-path frequency conversion signal and output a mixed frequency signal after mixing the multiple-path frequency conversion signal. The frequency band of the mixed frequency signal is the same as that of at least part of the signals in the transparent transmission signal. The passive frequency conversion circuit can be used to implement 5G MIMO network outdoor coverage using existing single-path network equipment, or to build new 5G MIMO network equipment, which is conducive to reducing the construction cost of 5G MIMO network outdoor coverage and shortening the construction period. BRIEF DESCRIPTION OF DRAWINGS

[0080] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed in the embodiments of the present disclosure will be briefly introduced below. Obviously, the drawings introduced below are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0081] FIG. 1 is a schematic diagram of the circuit structure of the passive frequency conversion circuit according to an embodiment of the present disclosure;

[0082] FIG. 2 is a schematic diagram of the circuit structure of the passive frequency conversion circuit according to an embodiment of the present disclosure;

[0083] FIG. 3 is a schematic diagram of the circuit structure of the passive frequency conversion circuit according to an embodiment of the present disclosure;

[0084] FIG. 4 is a schematic diagram of the circuit structure of the passive frequency conversion circuit according to an embodiment of the present disclosure;

[0085] Fig. 5 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0086] Fig. 6 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0087] Fig. 7 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0088] Fig. 8 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0089] Fig. 9 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0090] Fig. 10 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0091] Fig. 11 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0092] Fig. 12 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0093] Fig. 13 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0094] Fig. 14 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0095] Fig. 15 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0096] Fig. 16 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0097] Fig. 17 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0098] Fig. 18 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0099] Fig. 19 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0100] Fig. 20 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0101] Fig. 21 is a schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure;

[0102] FIG. 22 is a structural diagram of a multiple-input multiple-output signal transmission device according to an embodiment of the present disclosure;

[0103] FIG. 23 is a structural diagram of an antenna according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0104] In order to make the above objectives, features and advantages of the present disclosure more apparent, further description will be made to the present disclosure with reference to the accompanying drawings and embodiments. However, the example embodiments can be implemented in various forms, and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided so as to make the present disclosure more comprehensive and complete, and to fully convey the ideas of the example embodiments to those skilled in the art. The same reference signs in the drawings represent the same or similar structures, and thus repeated description thereof will be omitted. The words expressing position and direction described in the present disclosure are described with reference to the drawings, but can be changed as needed, and the changes made are included in the protection scope of the present disclosure. The drawings of the present disclosure are only used to illustrate the relative positional relationship and do not represent the true proportions.

[0105] The current fifth generation mobile communication technology (5G) network outdoor coverage still has the problems of high deployment cost and great coverage difficulty. One reason is that when the original single-path network equipment is reformed to 5G multiple-input multiple-output (MIMO), the original single-path network equipment needs to be completely replaced, and the hardware cost and time cost are large. How to realize the 5G MIMO network outdoor coverage on the basis of the original single-path network equipment to reduce the construction time and cost of the 5G MIMO network outdoor coverage has become a hot research issue at present.

[0106] Therefore, the first aspect of the embodiments of the present disclosure provides a passive frequency conversion circuit to solve the above problems.

[0107] FIG. 1 is a circuit structure schematic diagram of a passive frequency conversion circuit according to an embodiment of the present disclosure.

[0108] In the embodiments of the present disclosure, as shown in FIG. 1, the passive frequency conversion circuit includes a frequency division circuit 1, a pass-through circuit 2 and a frequency mixing circuit 3. The frequency division circuit 1 is electrically connected with the pass-through circuit 2 and the frequency mixing circuit 3 respectively. It should be noted that in the embodiments of the present disclosure, the electrical connection relationship between devices or circuits is shown by black thick solid lines, but the number of black thick solid lines does not limit the specific number of lines between devices or circuits. For example, in FIG. 1, the black thick solid line with two ends connected to the frequency division circuit 1 and the pass-through circuit 2 respectively represents the electrical connection relationship between the frequency division circuit 1 and the pass-through circuit 2, and the black thick solid line with two ends connected to the frequency division circuit 1 and the frequency mixing circuit 3 respectively represents the electrical connection relationship between the frequency division circuit 1 and the frequency mixing circuit 3, but it does not limit the specific number of lines between the frequency division circuit 1 and the pass-through circuit 2 and between the frequency division circuit 1 and the frequency mixing circuit 3. It should also be noted that in the embodiments of the present disclosure, the specific way of electrical connection represented by the black thick solid line is not limited, for example, two devices can be directly connected by a cable, or can be connected to an intermediate device through a cable and then connected through the intermediate device, and the specific type of cable can be optical fiber, coaxial cable, twisted pair, etc. according to actual needs, which is not limited here. In addition, in some specific embodiments of the present disclosure, a black thin solid line with a line width smaller than that of the black thick solid line is used as a further refinement of the electrical connection relationship between devices or circuits. In some embodiments, the number of black thin solid lines can represent the actual number of lines between devices or circuits. In some embodiments, the actual number of lines between devices or circuits can be different from the number of black thin solid lines between devices, which can be adjusted according to actual conditions during implementation, which is not limited here. Moreover, the specific electrical connection mode represented by the black thin solid line in the embodiments of the present disclosure is also not limited.

[0109] The frequency division circuit 1 is configured to receive an input of an external signal and divide the external signal into a pass-through signal and / or a multi-path frequency conversion signal. In practice, the input port of the frequency division circuit 1 can be electrically connected to a remote unit (RU) through a signal transmission cable, and the external signal output by the remote unit is input into the frequency division circuit 1 through the signal transmission cable. The external signal received by the frequency division circuit 1 can include multiple types of signals. For example, according to the classification of mobile communication technologies, the external signal received by the frequency division circuit 1 can include signals of different mobile communication technology categories such as 2G / 3G / 4G / 5G, etc. For example, according to the frequency band division of the signal, the external signal received by the frequency division circuit 1 can include signals of different frequency bands such as B8 / B3 / B34 / B39 / B40 / n41, etc. The specific division of signal frequency bands can refer to technical standards such as the 3rd Generation Partnership Project (3GPP), and will not be described here. For example, according to the transmission mode and function of the signal in the passive frequency conversion circuit, the external signal received by the frequency division circuit 1 can include a pass-through signal and a frequency conversion signal, wherein the difference between the pass-through signal and the frequency conversion signal is that the pass-through signal is output from the passive frequency conversion circuit according to the original frequency without frequency mixing after being input into the passive frequency conversion circuit, and the frequency conversion signal is used to be mixed into a mixed frequency signal different from the original frequency signal in the passive frequency conversion circuit after being input into the passive frequency conversion circuit, and then output from the passive frequency conversion circuit.

[0110] In practice, at the same time, the external signal received by the frequency division circuit 1 can only include a pass-through signal, only include a frequency conversion signal, or include both a pass-through signal and a frequency conversion signal. For example, at a certain time, the external signal received by the frequency division circuit 1 only includes a pass-through signal, and the frequency division circuit 1 outputs the pass-through signal received at that time to the pass-through circuit 2 electrically connected thereto. At a certain time, the external signal received by the frequency division circuit 1 only includes a frequency conversion signal, and the frequency division circuit 1 outputs the frequency conversion signal received at that time to the frequency mixing circuit 3 in multiple paths. At a certain time, the external signal received by the frequency division circuit 1 includes both a pass-through signal and a frequency conversion signal, and the frequency division circuit 1 outputs the pass-through signal received at that time to the pass-through circuit 2 and outputs the frequency conversion signal received at that time to the frequency mixing circuit 3 in multiple paths, respectively.

[0111] The transparent circuit 2 is configured to receive the transparent signal and output the transparent signal. The transparent circuit 2 can directly output the single transparent signal output by the frequency division circuit 1, or receive the multiple transparent signals output by the frequency division circuit 1 and output the multiple transparent signals after combining the multiple transparent signals into a single signal, without limitation. Specifically, the transparent signal can be a single frequency band signal or a signal including multiple frequency bands. When the transparent signal includes multiple frequency bands, the frequency division circuit 1 can be connected to the transparent circuit 2 through one output port, so that the multiple frequency band transparent signals are transmitted through one signal line at the same time, or the frequency division circuit 1 can be connected to the multiple input ports of the transparent circuit 2 through multiple output ports, so that the transparent signals of different frequency bands are transmitted through multiple signal lines, without limitation.

[0112] The mixing circuit 3 is configured to receive the multiple frequency conversion signals and output the mixing signal after mixing the multiple frequency conversion signals. In the embodiment of the present application, the mixing signal output by the mixing circuit 3 can be a single frequency band signal or a signal including multiple frequency bands, and the frequency band of the mixing signal output by the mixing circuit 3 is the same as that of at least part of the signals in the transparent signal. For example, the transparent signal can only include a signal of one frequency band, for example, the transparent signal can only include a signal of the n41 frequency band, and the mixing signal can also only include a signal of the n41 frequency band. For another example, the transparent signal can include signals of multiple frequency bands such as B8 / B3 / B34 / B39 / B40 / n41, and the mixing signal can include a signal of one frequency band among the signals of the multiple frequency bands such as B8 / B3 / B34 / B39 / B40 / n41, for example, the n41 frequency band. For another example, the transparent signal can include signals of multiple frequency bands such as B8 / B3 / B34 / B39 / B40 / n41, and the mixing signal can include signals of multiple frequency bands among the signals of the multiple frequency bands such as B8 / B3 / B34 / B39 / B40 / n41, or the mixing signal includes the same signals as the transparent signal, without limitation. The frequency band of the mixing signal output by the mixing circuit 3 is the same as that of at least part of the signals in the transparent signal, so that the transmission of double-flow signals can be realized for the signals of the same frequency band in the mixing signal and the transparent signal. For example, the signals of the same frequency band in the mixing signal and the transparent signal are 5G network signals, so that double-flow transmission of the 5G network signals can be realized. The signals of the same frequency band in the mixing signal and the transparent signal can also be signals under other communication technical specifications, such as 4G network signals, without limitation.

[0113] The mixing circuit 3 can be implemented by a mixer to perform the mixing function. Generally, the mixer can mix two frequency conversion signals into one mixed signal. For example, the frequency division circuit 1 can divide the frequency conversion signal into a first frequency conversion signal (frequency conversion signal 1) and a second frequency conversion signal (frequency conversion signal 2) input into the mixer, wherein the first frequency conversion signal can be a local oscillator (LO) signal, and the second frequency conversion signal can be an intermediate frequency (IF) signal. The LO signal and the IF signal are mixed into a radio frequency (RF) signal with a higher frequency to output, thereby realizing up-conversion output. For example, the first frequency conversion signal and the second frequency conversion signal can be signals with a lower frequency, and the first frequency conversion signal and the second frequency conversion signal can be mixed by the mixer to be up-converted into a 5G network signal with a higher frequency, which is not limited herein. Generally, the two signals input into the same mixer have different frequencies. In some embodiments, the two signals input into the same mixer can also have the same frequency, which is not limited herein. In some embodiments, the mixer can also be used to realize down-conversion output, which only needs to adjust the connection mode of the input port of the mixer and the frequency of the input signal, which is not described herein.

[0114] In some embodiments, the mixing circuit 3 can only include one mixer, and the frequency division circuit 1 divides the frequency conversion signal into two signals input into the mixer, thereby outputting a mixed signal of one frequency band. In some embodiments, the mixing circuit 3 can include multiple mixers, and the frequency division circuit 1 divides the frequency conversion signal into multiple signals (frequency conversion signal 1 to frequency conversion signal n) input into the mixers, each mixer can be used to output a mixed signal of one frequency band, and the frequency bands of the mixed signals output by each mixer can be the same or different, which is not limited herein. For example, the mixing circuit can include two mixers, and the frequency division circuit 1 can divide the frequency conversion signal into four signals for output, wherein two signals are connected to one mixer to be mixed into a mixed signal of one frequency band for output, and the other two signals are connected to the other mixer to be mixed into a mixed signal of another frequency band for output, which is not limited herein.

[0115] The passive frequency conversion circuit provided by the embodiments of the present disclosure can be applied to 5G MIMO reconstruction of an existing built 4G single-channel network device, so as to reduce the construction time and cost of 5G MIMO network coverage. For example, in the passive frequency conversion circuit provided by the embodiments of the present disclosure, the output end of the transparent transmission circuit 2 can be connected to one antenna unit in the existing 4G network device (such as a base station), for radiating a transparent transmission signal, and the output end of the frequency mixing circuit 3 can be connected to another antenna unit in the existing 4G network device, for radiating a frequency mixing signal, wherein the antenna unit can be a horn antenna, etc., which is not limited herein. The transparent transmission signal and the frequency mixing signal include 5G network signals of the same frequency band, so that the double-flow output of the 5G network signal can be realized, and the quality of the 5G network signal can be improved.

[0116] The passive frequency conversion circuit provided by the embodiments of the present disclosure can also be used to build a brand new 5G MIMO device, such as a 5G network base station. In specific implementation, the passive frequency conversion circuit provided by the embodiments of the present disclosure can be part of the 5G MIMO device, which is not limited herein.

[0117] In the embodiments of the present disclosure, the maximum input power of the frequency division circuit 1 in the passive frequency conversion circuit is greater than or equal to 38dBm. Specifically, the maximum power of the external signal that can be received by the passive frequency conversion circuit provided by the embodiments of the present disclosure is greater than or equal to 38dBm, so that the requirement of high-power signal transmission of 5G MIMO network outdoor coverage can be met. In specific implementation, the transmission power of the passive frequency conversion circuit provided by the embodiments of the present disclosure is compatible with the signal power requirement of 5G MIMO network indoor coverage, so that the application scenarios of the passive frequency conversion circuit are expanded.

[0118] FIG. 2 is a second schematic diagram of the circuit structure of the passive frequency conversion circuit provided by the embodiments of the present disclosure.

[0119] In some embodiments, as shown in FIG. 2, the frequency division circuit 1 includes an entrance duplexer 11 and a first splitter 12. The entrance duplexer 11 is electrically connected to the first splitter 12 and the transparent transmission circuit 2 respectively. The first splitter 12 is further divided into multiple paths and electrically connected to the frequency mixing circuit 3.

[0120] The inlet duplexer 11 adopts a duplexer as a device for receiving external signals by the frequency division circuit 1 and the passive frequency conversion circuit, and as an inlet for the external signals to enter the passive frequency conversion circuit. The inlet duplexer 11 is configured to receive external signals and divide the external signals into first frequency band signals and / or second frequency band signals. In the embodiment, the maximum input power of the inlet duplexer 11 is greater than or equal to 38 dBm to meet the transmission requirements of high-power signals. In specific implementation, the inlet duplexer 11 can adopt a metal cavity duplexer. Compared with a low temperature co-fired ceramic (LTCC) duplexer and a dielectric duplexer, the metal cavity duplexer can meet the transmission requirements of high-power multi-frequency band signals, and has a small insertion loss and a high suppression degree for each frequency band, which is conducive to reducing circuit loss.

[0121] In the embodiment shown in FIG. 2, the signal frequency band of the first frequency band signal does not overlap with the signal frequency band of the second frequency band signal. At a certain moment, the frequency band of the external signal received by the inlet duplexer 11 has multiple cases, such as a case where the external signal is all first frequency band signals, a case where the external signal is all second frequency band signals, and a case where the external signal includes both first frequency band signals and second frequency band signals. In specific implementation, the inlet duplexer 11 performs frequency division transmission according to the specific signal frequency band included in the received external signal. The first frequency band signals are all transparent signals, and the first frequency band signals are output by the inlet duplexer 11 to the transparent circuit 2. The second frequency band signals are output by the inlet duplexer 11 to the first splitter 12. The second frequency band signals include frequency conversion signals, and the frequency conversion signals in the second frequency band signals are output by the first splitter 12 to the mixing circuit 3.

[0122] In the embodiment shown in FIG. 2, the frequency of the first frequency band signal can be configured to be greater than the frequency of the second frequency band signal, so that the frequency conversion signals in the second frequency band signals can be up-converted by the mixing circuit 3 to realize the transmission of double-flow or multi-flow 5G signals. The frequency conversion signals in the second frequency band signals adopt a lower frequency, which can reduce the requirement for the performance of devices and is conducive to reducing costs. For example, the first frequency band signals can include signals of multiple frequency bands, such as signals of B3 / B34 / B39 / B40 / n41, and the frequency conversion signals in the second frequency band signals can include LO signals and IF signals corresponding to the input ports of the mixer, wherein the frequencies of the LO signals and the IF signals are both less than the frequency of the first frequency band signals. In some embodiments, the frequency of the first frequency band signal can also be less than the frequency of the second frequency band signal, which is not limited herein.

[0123] FIG. 3 is a third schematic diagram of the circuit structure of the passive frequency conversion circuit provided by the embodiment of the present disclosure.

[0124] The embodiment shown in Figure 3 further incorporates a duplexer into the first splitter 12, building upon the embodiment shown in Figure 2. Specifically, the first splitter 12 can be a metal cavity duplexer, an LTCC duplexer, or a dielectric duplexer, depending on the power of the second frequency band signal; no particular limitation is made here. In practical implementation, the second frequency band signal can be configured to include only the frequency conversion signal. After receiving the second frequency band signal at its input port, the first splitter 12 divides the second frequency band signal into one LO signal (frequency conversion signal 1) and one IF signal (frequency conversion signal 2), which are then output from the output port.

[0125] In the embodiment shown in Figure 3, the mixer circuit 3 can specifically be a three-port mixer. The three-port mixer has two input ports and one output port, where the two input ports are the LO port and the IF port, and the output port is the RF port. The LO port and IF port of the three-port mixer are electrically connected to the two output ports of the first splitter 12, respectively, to receive the LO signal and the IF signal. After mixing the LO signal and the IF signal, the three-port mixer outputs the mixed signal from the RF port.

[0126] Figure 4 is a fourth schematic diagram of the circuit structure of the passive frequency converter circuit provided in the embodiments of this disclosure.

[0127] Compared to the embodiment shown in Figure 3, the passive frequency converter circuit in the embodiment shown in Figure 4 further includes multiple filters 4. These multiple filters 4 are correspondingly disposed on the multi-signal lines between the first splitter 12 and the mixer circuit 3. The first splitter 12 is electrically connected to the mixer circuit 3 through the multiple filters 4. Specifically, for each filter 4, its input terminal is electrically connected to one output port of the first splitter 12, and its output terminal is electrically connected to one input port of the three-port mixer. The filters 4 are used to eliminate interference signals in each frequency conversion signal between the first splitter 12 and the mixer circuit 3, improving the purity and accuracy of the frequency conversion signal. In specific implementations, the filters 4 can be devices belonging to the frequency divider circuit 1, devices belonging to the mixer circuit 3, or independent devices; no limitation is made here.

[0128] Figure 5 is the fifth schematic diagram of the circuit structure of the passive frequency converter circuit provided in the embodiments of this disclosure.

[0129] The embodiment shown in FIG. 5 further electrically connects the first shunt 12 with the transmissive circuit 2 on the basis of the embodiment shown in FIG. 2. In specific implementation, the second frequency band signal further includes the transmissive signal, the transmissive signal in the second frequency band signal is output to the transmissive circuit 2 by the first shunt 12, and the transmissive signal in the second frequency band signal is output by the output end of the transmissive circuit 2 after being combined with the first frequency band signal in the transmissive circuit 2. The second frequency band signal includes the transmissive signal, which is beneficial to expand the number of signal frequency bands and improve the signal transmission efficiency. For example, the first frequency band signal can include signals of multiple frequency bands, such as signals of B3 / B34 / B39 / B40 / n41, and the signals of B3 / B34 / B39 / B40 / n41 are all transmissive signals. The frequency conversion signal in the second frequency band signal can include an LO signal and an IF signal corresponding to the input port of the frequency mixer, and a B8 frequency band signal, and the frequencies of the LO signal, the IF signal and the B8 frequency band signal are all less than the frequency of the first frequency band signal. In addition, the frequency of the B8 frequency band signal can be less than the frequency of the LO signal, and the frequency of the LO signal is less than the frequency of the IF signal, which is not limited herein.

[0130] In specific implementation, the transmissive circuit 2 can adopt a metal cavity duplexer to meet the high-power transmission requirement when the transmissive circuit simultaneously receives the transmissive signals in the first frequency band signal and the second frequency band signal. In some embodiments, the transmissive circuit 2 can also adopt a cavity combiner, which is not limited herein.

[0131] FIG. 6 is a sixth circuit structure schematic diagram of the passive frequency conversion circuit provided by the embodiments of the present disclosure.

[0132] The embodiment shown in FIG. 6 further adopts a triplexer for the first shunt 12 on the basis of the embodiment shown in FIG. 5. The triplexer generally includes one input port and three output ports. The input port of the triplexer adopted by the first shunt 12 is electrically connected with one output port of the inlet duplexer 11, two of the three output ports are respectively electrically connected with two input ports of the frequency mixing circuit 3, and one output port is electrically connected with one input port of the transmissive circuit 2. Among them, the first shunt 12 can adopt a cavity triplexer, an LTCC triplexer, etc. according to the power size of the second frequency band signal to meet the use requirement, which is not limited herein.

[0133] In specific implementation, the second frequency band signal can be configured to include the frequency conversion signal and the transmissive signal. After the input port of the first shunt 12 receives the second frequency band signal, the frequency conversion signal in the second frequency band signal is divided into one LO signal (frequency conversion signal 1) and one IF signal (frequency conversion signal 2) and is output from the two output ports to the frequency mixing circuit 3, and the transmissive signal in the second frequency band signal is output to the transmissive circuit 2.

[0134] In the embodiment shown in FIG. 6, the mixing circuit 3 can employ a three-port mixer, which has two input ports and one output port. The two input ports are respectively an LO port and an IF port, and the output port is an RF port. The LO port and the IF port of the three-port mixer are respectively electrically connected to the two output ports of the first shunt 12, for receiving the LO signal and the IF signal respectively. The three-port mixer outputs the mixed signal from the RF port after mixing the LO signal and the IF signal.

[0135] FIG. 7 is a seventh schematic diagram of the circuit structure of the passive frequency conversion circuit according to an embodiment of the present disclosure.

[0136] Compared with the embodiment shown in FIG. 6, the passive frequency conversion circuit further includes a plurality of filters 4 in the embodiment shown in FIG. 7. The plurality of filters 4 are respectively arranged on the plurality of signal lines between the first shunt 12 and the mixing circuit 3, and the first shunt 12 is electrically connected to the mixing circuit 3 through the plurality of filters 4. Specifically, for each filter 4, an input port thereof is electrically connected to an output port of the first shunt 12, and an output port thereof is electrically connected to an input port of the three-port mixer. The filter 4 is used to eliminate the interference signal in each frequency conversion signal between the first shunt 12 and the mixing circuit 3, so as to improve the purity and accuracy of the frequency conversion signal. In a specific implementation, the filter 4 can be a device belonging to the frequency division circuit 1, or a device belonging to the mixing circuit 3, or an independent device, which is not limited herein.

[0137] FIG. 8 is an eighth schematic diagram of the circuit structure of the passive frequency conversion circuit according to an embodiment of the present disclosure.

[0138] In some embodiments, as shown in FIG. 8, the frequency division circuit 1 includes a power divider 13, a second shunt 14, a third shunt 15, a fourth shunt 16 and a fifth shunt 17. The power divider 13 is electrically connected to the second shunt 14 and the third shunt 15 respectively. The second shunt 14 is further electrically connected to the transparent circuit 2 and the fourth shunt 16 respectively. The fourth shunt 16 is further electrically connected to the mixing circuit 3. The third shunt 15 is further electrically connected to the transparent circuit 2 and the fifth shunt 17 respectively. The fifth shunt 17 is further electrically connected to the mixing circuit 3.

[0139] The power divider 13 is a device for receiving external signals by the frequency division circuit 1 and the passive frequency conversion circuit, and is an entrance for the external signals to enter the passive frequency conversion circuit. The power divider 13 is configured to receive the external signals and divide the external signals into a first power signal and a second power signal. The frequency band of the first power signal and the frequency band of the second power signal are both the same as the frequency band of the received external signals, and the power of the first power signal and the power of the second power signal are both less than the power of the external signals. Generally, the power divider 13 can divide the external signals into two signals with the same frequency and the same power, i.e., the power divider 13 can divide the external signals into the first power signal and the second power signal with the same frequency and the same power, and considering the power loss, the sum of the power of the first power signal and the power of the second power signal is less than or equal to the power of the external signals before power division. In some embodiments, the power of the first power signal and the power of the second power signal can also be different, but the power of the first power signal and the power of the second power signal are each less than the power of the external signals before power division. In some embodiments, the power divider 13 can also divide the external signals into more signals with the same frequency band, the same or different power, for example, divide the external signals into a first power signal, a second power signal, a third power signal, etc. However, no matter how many signals the power divider 13 divides the external signals into, at least the first power signal and the second power signal are included, i.e., the structure of the passive frequency conversion circuit at least includes all the devices or structures required to divide the external signals into the first power signal and the second power signal to achieve the function of the circuit. Therefore, in the embodiment shown in FIG. 8, the power divider 13 divides the external signals into two signals, and the structure of the passive frequency conversion circuit is exemplified in this case. When the power divider 13 divides the external signals into more than two signals, the structure of the passive frequency conversion circuit can be adjusted accordingly according to the case of dividing the external signals into two signals, which is not described here.

[0140] In the embodiment shown in FIG. 8, by setting the power divider 13 to receive the external signals, the power divider 13 can divide the external signals with large power into multiple small power signals with power significantly reduced compared to the power of the external signals, so that small power devices can be used in the circuit behind the power divider 13, thereby reducing the performance requirements of the devices behind the power divider 13 and reducing the cost. For example, the power divider 13 can divide the external signals into two or more signals with the same power, and the power of each signal is less than or equal to half of the power of the external signals. If the power divider 13 divides the external signals into multiple signals with different powers, the power of each signal can be configured to be less than or equal to 36 dBm, so as to reduce the performance requirements of the devices located behind the power divider 13, thereby reducing the manufacturing cost.

[0141] In the embodiment, the maximum input power of the power divider 13 is greater than or equal to 38 dBm to meet the transmission requirement of the high-power signal. In practice, the power divider 13 can be a cavity power divider or other high-power power divider to meet the transmission requirement of the high-power multi-frequency band signal.

[0142] The input port of the second shunt 14 is electrically connected with one output port of the power divider 13. The second shunt 14 is configured to receive the first power signal and split the first power signal into the first frequency band signal and / or the second frequency band signal. The third shunt 15 is configured to receive the second power signal and split the second power signal into the first frequency band signal and / or the second frequency band signal. Since the first power signal received by the second shunt 14 and the second power signal received by the third shunt 15 have relatively small power compared with the external signal, the second shunt 14 and the third shunt 15 can be small-power devices to reduce the cost of the devices. In practice, according to actual requirements, the second shunt 14 and the third shunt 15 can be low-temperature co-fired ceramic duplexers or dielectric duplexers or other low-cost and small-size duplexers, which are not limited herein.

[0143] In the embodiment shown in FIG. 8, the signal frequency band of the first frequency band signal does not overlap with the signal frequency band of the second frequency band signal. At a certain moment, the frequency band of the external signal received by the power divider 13 has multiple cases, such as the case that the external signal is all the first frequency band signal, the case that the external signal is all the second frequency band signal, and the case that the external signal includes both the first frequency band signal and the second frequency band signal. In practice, since the signal frequency band included in the first power signal and the signal frequency band included in the second power signal are the same as the signal frequency band of the external signal, at a certain moment, the frequency band of the first power signal and the frequency band of the second power signal have the case that they are all the first frequency band, the case that they are all the second frequency band, and the case that they include both the first frequency band and the second frequency band, and the second shunt 14 and the third shunt 15 split and transmit the signals according to the specific signal frequency band included in the receivable signals. The first frequency band signal is all the transparent signal, and the first frequency band signal is output by the second shunt 14 and the third shunt 15 to the transparent circuit 2, respectively. The second frequency band signal is output by the second shunt 14 and the third shunt 15 to the fourth shunt 16 and the fifth shunt 17, respectively. The second frequency band signal includes the frequency conversion signal, and the frequency conversion signal in the second frequency band signal is output by the fourth shunt 16 to the frequency conversion circuit 3 in multiple paths and by the fifth shunt 17 to the frequency conversion circuit 3 in multiple paths, respectively.

[0144] In the embodiment shown in FIG. 8, the frequency of the first frequency band signal can be configured to be greater than the frequency of the second frequency band signal, so that the frequency conversion signal in the second frequency band signal can be up-converted by the frequency mixing circuit 3 to realize the transmission of double-flow or multi-flow 5G signals. The frequency conversion signal in the second frequency band signal adopts a lower frequency, which can reduce the requirement on the performance of the device and is conducive to reducing the cost. For example, the first frequency band signal can include signals of multiple frequency bands, such as signals of B3 / B34 / B39 / B40 / n41, and the frequency conversion signal in the second frequency band signal can include an LO signal and an IF signal corresponding to the input port of the frequency mixer, wherein the frequencies of the LO signal and the IF signal are both less than the frequency of the first frequency band signal. In some embodiments, the frequency of the first frequency band signal can also be less than the frequency of the second frequency band signal, which is not limited herein.

[0145] FIG. 9 is a ninth schematic diagram of the circuit structure of the passive frequency conversion circuit provided by the embodiments of the present disclosure.

[0146] The embodiment shown in FIG. 9 further adopts a duplexer for the fourth shunt 16 and a duplexer for the fifth shunt 17 on the basis of the embodiment shown in FIG. 8. In specific implementation, since the second frequency band signal has a small power, the fourth shunt 16 and the fifth shunt 17 can adopt a low-cost and small-size duplexer such as an LTCC duplexer or a dielectric duplexer, which is not limited herein. In specific implementation, the second frequency band signal can be configured to include only the frequency conversion signal, the input port of the fourth shunt 16 receives the second frequency band signal, and then divides the second frequency band signal into one LO signal (frequency conversion signal 1) and one IF signal (frequency conversion signal 2) from the output port to the frequency mixing circuit 3, and the input port of the fifth shunt 17 receives the second frequency band signal, and then divides the second frequency band signal into one LO signal (frequency conversion signal 1) and one IF signal (frequency conversion signal 2) from the output port to the frequency mixing circuit 3.

[0147] FIG. 10 is a tenth schematic diagram of the circuit structure of the passive frequency conversion circuit provided by the embodiments of the present disclosure.

[0148] The embodiment shown in FIG. 10 further electrically connects the fourth shunt 16 and the fifth shunt 17 with the transmittance circuit 2 on the basis of the embodiment shown in FIG. 8. In a specific implementation, the second frequency band signal further includes the transmittance signal, and the transmittance signal in the second frequency band signal is output to the transmittance circuit 2 by the fourth shunt 16 and is output to the transmittance circuit 2 by the fifth shunt 17. The transmittance signal in the second frequency band signal is output by the output end of the transmittance circuit 2 after being combined with the first frequency band signal in the transmittance circuit 2. The second frequency band signal includes the transmittance signal, which is beneficial to expand the number of signal frequency bands and improve the signal transmission efficiency. For example, the first frequency band signal can include signals of multiple frequency bands, such as signals of B3 / B34 / B39 / B40 / n41, and the signals of B3 / B34 / B39 / B40 / n41 are transmittance signals. The frequency conversion signal in the second frequency band signal can include an LO signal and an IF signal corresponding to the input port of the frequency mixer, and a B8 frequency band signal, and the frequency of the B8 frequency band signal is less than the frequency of the LO signal and the frequency of the LO signal is less than the frequency of the IF signal, which is not limited herein.

[0149] In a specific implementation, the transmittance circuit 2 can adopt a combiner. Specifically, the transmittance circuit 2 can adopt a cavity combiner to meet the high-power transmission requirement when the transmittance circuit simultaneously receives the first frequency band signal and the transmittance signal in the second frequency band signal.

[0150] FIG. 11 is a schematic diagram of the circuit structure of the passive frequency conversion circuit according to an embodiment of the present disclosure.

[0151] The embodiment shown in FIG. 11 further adopts a triplexer for the fourth shunt 16 and a triplexer for the fifth shunt 17 on the basis of the embodiment shown in FIG. 10. A triplexer generally includes one input port and three output ports. The input port of the triplexer adopted by the fourth shunt 16 is electrically connected with one output port of the second shunt 14, two of the three output ports are electrically connected with the frequency mixing circuit, and one output port is electrically connected with one input port of the transmittance circuit 2. The input port of the triplexer adopted by the fifth shunt 17 is electrically connected with one output port of the third shunt 15, two of the three output ports are electrically connected with the frequency mixing circuit, and one output port is electrically connected with one input port of the transmittance circuit 2. Since the power of the second frequency band signal received by the fourth shunt 16 and the fifth shunt 17 is small, the fourth shunt 16 and the fifth shunt 17 can adopt a small-size and low-cost triplexer such as an LTCC triplexer, which meets the use requirement in a specific use, and is not limited herein.

[0152] In a specific implementation, the second frequency band signal can include a frequency conversion signal and a pass-through signal. After the input port of the fourth splitter 16 receives the second frequency band signal, the frequency conversion signal in the second frequency band signal is split into an LO signal (frequency conversion signal 1) and an IF signal (frequency conversion signal 2) which are respectively output from two output ports to the mixing circuit 3, and the pass-through signal in the second frequency band signal is output to the pass-through circuit 2. After the input port of the fifth splitter 17 receives the second frequency band signal, the frequency conversion signal in the second frequency band signal is split into an LO signal (frequency conversion signal 1) and an IF signal (frequency conversion signal 2) which are respectively output from two output ports to the mixing circuit 3, and the pass-through signal in the second frequency band signal is output to the pass-through circuit 2.

[0153] FIG. 12 is a twelfth schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure.

[0154] Compared with the embodiment shown in FIG. 10, the frequency conversion circuit 1 shown in FIG. 12 further includes a first combiner 18 and a second combiner 19. The second splitter 14 and the third splitter 15 are electrically connected to the first combiner 18 and are electrically connected to the pass-through circuit 2 through the first combiner 18. The fourth splitter 16 and the fifth splitter 17 are electrically connected to the second combiner 19 and are electrically connected to the pass-through circuit 2 through the second combiner 19. Specifically, the first combiner 18 is configured to receive the first frequency band signal from the second splitter 14 and the first frequency band signal from the third splitter 15, respectively, combine the two paths of the first frequency band signal into one path, and output the one path to the pass-through circuit 2. The second combiner 19 is configured to receive the pass-through signal from the fourth splitter 16 and the pass-through signal from the fifth splitter 17, respectively, combine the two paths of the pass-through signal into one path, and output the one path to the pass-through circuit 2. Combining the two paths of the first frequency band signal into one path and inputting the one path to the pass-through circuit 2, and combining the two paths of the pass-through signal into one path and inputting the one path to the pass-through circuit 2, are beneficial to reduce the input port of the pass-through circuit 2 and simplify the circuit structure of the pass-through circuit 2. In a specific implementation, the model of the first combiner 18 and the second combiner 19 can be selected according to the power requirement, which is not limited herein. The pass-through circuit 2 can use a cavity combiner or a metal cavity duplexer and other high-power devices to meet the requirement of high-power signal transmission, which is not limited herein.

[0155] FIG. 13 is a thirteenth schematic diagram of a circuit structure of a passive frequency conversion circuit according to an embodiment of the present disclosure.

[0156] In some embodiments as shown in FIG. 8, the frequency division circuit 1 can further include a plurality of third combiners. Each of the plurality of third combiners is electrically connected with the fourth splitter 16, the fifth splitter 17 and the mixing circuit 3 respectively. Each of the third combiners is configured to combine one of the multiple frequency conversion signals output by the fourth splitter 16 and one of the multiple frequency conversion signals output by the fifth splitter 17 into one frequency conversion signal and output to the mixing circuit 3. And the two frequency conversion signals input to the same third combiner have the same frequency band. By combining the two frequency conversion signals with the same frequency band output by the fourth splitter 16 and the fifth splitter 17 into one frequency conversion signal through the third combiner and then inputting the frequency conversion signal into the mixing circuit 3, the input ports of the mixing circuit 3 can be reduced and the structure of the mixing circuit 3 can be simplified. The mixing circuit 3 can include at least one frequency mixer. The number of the frequency mixers can be set according to the number of the output mixed signals, and the number of the combiners can be set according to the number of the frequency mixers. Generally, one frequency mixer includes two input ports and one output port, the two input ports of the frequency mixer are electrically connected with the output ports of two third combiners respectively, for receiving two frequency conversion signals and mixing the two frequency conversion signals into a mixed signal and then outputting the mixed signal through the output port. For example, as shown in FIG. 13, the fourth splitter 16 can output two frequency conversion signals, i.e. frequency conversion signal 1 and frequency conversion signal 2, the fifth splitter 17 can output two frequency conversion signals, i.e. frequency conversion signal 1 and frequency conversion signal 2, and the mixing circuit 3 includes one frequency mixer. The two frequency conversion signals (frequency conversion signal 1) with the same frequency band output by the fourth splitter 16 and the fifth splitter 17 are input into the same third combiner 20 and then combined into one frequency conversion signal through the third combiner 20 and input into the frequency mixer of the mixing circuit 3, the other two frequency conversion signals (frequency conversion signal 2) with the same frequency band output by the fourth splitter 16 and the fifth splitter 17 are input into another third combiner 20 at the same time and then combined into one frequency conversion signal through the third combiner 20 and input into the frequency mixer of the mixing circuit 3, and the frequency mixer of the mixing circuit 3 mixes the two frequency conversion signals (frequency conversion signal 1 and frequency conversion signal 2) from the two third combiners 20 into a mixed signal (for example, a signal of n41 frequency band) and then outputs the mixed signal through the output port of the frequency mixer.

[0157] FIG. 14 is a fourteenth schematic diagram of the circuit structure of the passive frequency conversion circuit according to the embodiments of the present disclosure.

[0158] In some embodiments as shown in FIG. 8, the mixing circuit 3 comprises at least one mixer and a plurality of third combiners. Each of the plurality of third combiners is electrically connected with the fourth splitter 16, the fifth splitter 17 and one mixer respectively. Each third combiner is configured to combine one of the plurality of frequency converted signals output by the fourth splitter 16 and one of the plurality of frequency converted signals output by the fifth splitter 17 into one frequency converted signal and output to the corresponding mixer. And the same third combiner receives frequency converted signals from the fourth splitter 16 and the fifth splitter 17 with the same frequency band. By combining two frequency converted signals with the same frequency band which need to be input to the same mixer into one frequency converted signal through the third combiner and then input to the mixer, the number of input ports of the mixer is reduced and the structure of the mixer is simplified. For example, as shown in FIG. 14, the fourth splitter 16 can output two frequency converted signals, frequency converted signal 1 and frequency converted signal 2, and the fifth splitter 17 can output two frequency converted signals, frequency converted signal 1 and frequency converted signal 2. The mixing circuit 3 comprises one mixer 31 and two third combiners 20. One third combiner 20 of the mixing circuit 3 is used to receive two frequency converted signals (frequency converted signal 1) with the same frequency band output by the fourth splitter 16 and the fifth splitter 17 respectively, combine them into one frequency converted signal through the third combiner 20 and then input to the mixer 31 of the mixing circuit 3. Another third combiner 20 of the mixing circuit 3 is used to receive another two frequency converted signals (frequency converted signal 2) with the same frequency band output by the fourth splitter 16 and the fifth splitter 17 respectively, combine them into one frequency converted signal through the third combiner 20 and then input to the mixer 31 of the mixing circuit 3. The mixer 31 of the mixing circuit 3 mixes the two frequency converted signals (frequency converted signal 1 and frequency converted signal 2) from the two third combiners 20 respectively into a mixed signal (for example, a signal of n41 frequency band) and then outputs from the output end of the mixer 31.

[0159] It should be noted that the difference between the embodiment shown in FIG. 14 and the embodiment shown in FIG. 13 is that, in the embodiment shown in FIG. 13, the third combiner 20 is a device in the frequency division circuit 1, while in the embodiment shown in FIG. 14, the third combiner 20 is a device in the frequency mixing circuit 3. For example, in actual production, the product form of the passive frequency conversion circuit provided by the embodiment of the present disclosure can be a printed circuit board (PCB), and the frequency division circuit 1 and the frequency mixing circuit 3 can be respectively manufactured on two separate printed circuit boards (PCB). Corresponding to the embodiment shown in FIG. 13, the third combiner 20 is manufactured on the PCB where the frequency division circuit 1 is located; corresponding to the embodiment shown in FIG. 14, the third combiner 20 is manufactured on the PCB where the frequency mixing circuit 3 is located. The frequency division circuit 1 and the frequency mixing circuit 3 can also be manufactured on the same PCB, which is not limited here. In specific implementation, the passive frequency conversion circuit provided by the embodiment of the present disclosure can also be other forms of products, such as integrated circuits (IC), etc., which are not limited here.

[0160] In some embodiments as shown in FIG. 8, the passive frequency conversion circuit further comprises a plurality of filters. The plurality of filters are respectively arranged on the multi-path signal lines between the fourth shunt 16 and the frequency mixing circuit 3, and on the multi-path signal lines between the fifth shunt 17 and the frequency mixing circuit 3. The fourth shunt 16 and the fifth shunt 17 are electrically connected to the frequency mixing circuit 3 through the filters. For example, in some embodiments, as shown in FIG. 13, the filters 4 are respectively arranged on the two signal lines between the fourth shunt 16 and the two third combiners 20, and on the two signal lines between the fifth shunt 17 and the two third combiners 20. In some embodiments, as shown in FIG. 14, the filters 4 are respectively arranged on the two signal lines between the two third combiners 20 and the frequency mixer 31. The embodiments shown in FIG. 13 and FIG. 14 are only used to illustrate the arrangement of the filters, and the position of the filters can be adjusted according to actual conditions in specific implementation, for example, for any one of the embodiments shown in FIG. 8-FIG. 12, the position of the filters can be arranged according to actual conditions with reference to FIG. 13 and FIG. 14, as long as it can play a role in eliminating interference signals in the frequency conversion signal and improving the purity and accuracy of the frequency conversion signal, which is not limited here. In specific implementation, the filters 4 can be devices in the frequency division circuit 1, or can be devices in the frequency mixing circuit 3, which is not limited here.

[0161] FIG. 15 is a fifteenth schematic diagram of the circuit structure of the passive frequency conversion circuit provided by the embodiment of the present disclosure.

[0162] In some embodiments, as shown in FIG. 15, the frequency division circuit 1 comprises an attenuator 21, a sixth shunt 22 and a seventh shunt 23. The transparent transmission circuit 2 comprises a transparent transmission module 24 and a first amplifier 25 connected with each other. The frequency mixing circuit 3 comprises a frequency mixing module 31 and a second amplifier 32 connected with each other.

[0163] The attenuator 21 is electrically connected with the sixth shunt 22. The sixth shunt 22 is further electrically connected with the seventh shunt 23 and the transparent transmission module 24 respectively. The seventh shunt 23 is further connected with the frequency mixing module 31.

[0164] The attenuator 21 has the function of attenuating signals to reduce signal power. The attenuator 21 is configured to receive external signals and output the reduced external signals to the sixth shunt 22. Specifically, the attenuator can attenuate the input high-power external signals to small-power signals, for example, the power of the external signals can be attenuated from more than 38 dBm to less than 36 dBm, or to a smaller power, so that the circuits behind the attenuator 21 can be made of small-power devices, for example, the sixth shunt 22, the seventh shunt 23 and the transparent transmission module 24 can be made of small-power devices with smaller size and lower cost, thereby reducing the performance requirements of the devices located behind the attenuator 21 and reducing the cost of the devices.

[0165] The sixth shunt 22 is configured to receive the reduced external signals output by the attenuator 21 and divide the reduced external signals into first frequency band signals and / or second frequency band signals.

[0166] In the embodiment shown in FIG. 15, the signal frequency band of the first frequency band signal does not overlap with the signal frequency band of the second frequency band signal. At a certain moment, the frequency band of the external signals received by the attenuator 21 includes several cases, for example, the case where the external signals are all first frequency band signals, the case where the external signals are all second frequency band signals, and the case where the external signals include both first frequency band signals and second frequency band signals. Therefore, the reduced external signals received by the sixth shunt 22 also include the above-mentioned several cases. In specific implementation, the sixth shunt 22 divides and transmits the specific signal frequency band included in the received reduced external signals. The first frequency band signals are all transparent transmission signals, and the first frequency band signals are output by the sixth shunt 22 to the transparent transmission module 24. The first amplifier 25 is configured to receive the transparent transmission signals output by the transparent transmission module 24 and output the amplified transparent transmission signals. The second frequency band signals are output by the sixth shunt 22 to the seventh shunt 23. The second frequency band signals include frequency conversion signals, and the frequency conversion signals in the second frequency band signals are output by the seventh shunt 23 to the frequency mixing module 31. The frequency mixing module 31 is configured to receive the multiple frequency conversion signals, mix the multiple frequency conversion signals into frequency mixing signals and output the frequency mixing signals to the second amplifier 32. The second amplifier 32 amplifies and outputs the frequency mixing signals.

[0167] In the embodiment shown in FIG. 15, the frequency of the first frequency band signal can be configured to be greater than the frequency of the second frequency band signal, so that the frequency conversion signal in the second frequency band signal can be up-converted by the frequency mixing circuit 3 to realize the transmission of a dual-flow or multi-flow 5G signal. The frequency conversion signal in the second frequency band signal adopts a lower frequency, which can reduce the requirement for the performance of the device and is conducive to reducing the cost. For example, the first frequency band signal can include signals of multiple frequency bands, such as signals of B3 / B34 / B39 / B40 / n41, and the frequency conversion signal in the second frequency band signal can include an LO signal and an IF signal corresponding to the input port of the frequency mixing module 31, wherein the frequencies of the LO signal and the IF signal are both less than the frequency of the first frequency band signal. In some embodiments, the frequency of the first frequency band signal can also be less than the frequency of the second frequency band signal, which is not limited herein.

[0168] In some embodiments shown in FIG. 15, the sixth shunt 22 can adopt a duplexer. The input end of the duplexer adopted by the sixth shunt 22 is used to receive the reduced external signal, and the two output ends are respectively electrically connected with the seventh shunt 23 and the transparent module 24, and are used to output the first frequency band signal and the second frequency band signal. In specific implementation, since the power of the reduced external signal is low, the sixth shunt 22 can adopt a small-size and low-cost duplexer such as a low-temperature co-fired ceramic duplexer or a dielectric duplexer, which is not limited herein.

[0169] FIG. 16 is a sixth circuit structure schematic diagram of the passive frequency conversion circuit provided by the embodiments of the present disclosure.

[0170] The embodiment shown in FIG. 16 further adopts a duplexer for the seventh shunt 23 on the basis of the embodiment shown in FIG. 15. Since the second frequency band signal has a small power, the seventh shunt 23 can specifically adopt a small-size and low-cost duplexer such as an LTCC duplexer or a dielectric duplexer, which is not limited herein. In specific implementation, the second frequency band signal can be configured to include only a frequency conversion signal, and after the input port of the seventh shunt 23 receives the second frequency band signal, the seventh shunt 23 divides the second frequency band signal into an LO signal (frequency conversion signal 1) and an IF signal (frequency conversion signal 2) and outputs them from the output port.

[0171] In the embodiment shown in FIG. 16, the frequency mixing module 31 can specifically adopt a three-port frequency mixer. The three-port frequency mixer has two input ports and one output port, wherein the two input ports are respectively an LO port and an IF port, and the output port is an RF port. The LO port and the IF port of the three-port frequency mixer are electrically connected with the two output ports of the seventh shunt 23 respectively, and are used to receive the LO signal and the IF signal respectively. The three-port frequency mixer mixes the LO signal and the IF signal and outputs the mixed signal from the RF port.

[0172] Fig. 17 is a schematic diagram of the circuit structure of the passive frequency conversion circuit according to an embodiment of the present disclosure.

[0173] The embodiment shown in Fig. 17 further electrically connects the seventh shunt 23 and the transparent module 24 on the basis of the embodiment shown in Fig. 15. In practice, the second frequency band signal further includes a transparent signal, the transparent signal in the second frequency band signal is output by the seventh shunt 23 to the transparent module 24, and the transparent signal in the second frequency band signal is output by the output end of the transparent module 24 after being combined with the first frequency band signal in the transparent module 24. The second frequency band signal includes the transparent signal, which is beneficial to expand the number of signal frequency bands and improve the signal transmission efficiency. For example, the first frequency band signal can include signals of multiple frequency bands, such as signals of B3 / B34 / B39 / B40 / n41 frequency bands. The signals of B3 / B34 / B39 / B40 / n41 frequency bands are transparent signals, and the frequency conversion signal in the second frequency band signal can include LO signals and IF signals corresponding to the input ports of the frequency mixer, and a signal of a B8 frequency band. The signal of the B8 frequency band is a transparent signal, wherein the frequencies of the LO signals, the IF signals, and the B8 frequency band signal are all less than the frequency of the first frequency band signal. In addition, the frequency of the B8 frequency band signal can be less than the frequency of the LO signal, and the frequency of the LO signal is less than the frequency of the IF signal, which is not limited herein.

[0174] In practice, since the signal power received by the transparent module 24 is small, the transparent module 24 can use a small-size and low-cost duplexer such as an LTCC duplexer or a dielectric duplexer, or other small-power combiner devices, which are not limited herein.

[0175] Fig. 18 is a schematic diagram of the circuit structure of the passive frequency conversion circuit according to an embodiment of the present disclosure.

[0176] The embodiment shown in FIG. 18 further employs a triplexer for the seventh shunt 23 on the basis of the embodiment shown in FIG. 17. The triplexer generally includes one input port and three output ports. The input port of the triplexer employed by the seventh shunt 23 is electrically connected with one output port of the sixth shunt 22 for receiving the second frequency band signal. Two of the three output ports are respectively electrically connected with two input ports of the mixing module 31 for transmitting two variable frequency signals. One output port is electrically connected with one input port of the transparent transmission module 24 for transmitting the transparent transmission signal. Since the second frequency band signal has a small power, the seventh shunt 23 can specifically employ a small-size and low-cost triplexer such as an LTCC triplexer, which is not limited herein. In a specific implementation, the second frequency band signal can be configured to include the variable frequency signal and the transparent transmission signal. After the input port of the seventh shunt 23 receives the second frequency band signal, the variable frequency signal in the second frequency band signal is divided into one LO signal (variable frequency signal 1) and one IF signal (variable frequency signal 2) and output from the two output ports to the mixing module 31, and the transparent transmission signal in the second frequency band signal is output to the transparent transmission module 24.

[0177] In the embodiment shown in FIG. 18, the mixing module 31 can employ a three-port mixer. The three-port mixer has two input ports and one output port. The two input ports are respectively an LO port and an IF port, and the output port is an RF port. The LO port and the IF port of the three-port mixer are respectively electrically connected with the two output ports of the seventh shunt 23 for respectively receiving the LO signal and the IF signal. The RF port is electrically connected with the second amplifier 32. After the three-port mixer mixes the LO signal and the IF signal, the mixed signal is output from the RF port to the second amplifier 32.

[0178] FIG. 19 is a nineteenth schematic diagram of the circuit structure of the passive variable frequency circuit provided by the embodiment of the present disclosure.

[0179] Compared with the embodiment shown in FIG. 18, the embodiment shown in FIG. 19 further comprises a plurality of filters 4. The plurality of filters 4 are arranged on the signal lines between the seventh shunt 23 and the mixing module 31, and the seventh shunt 23 is electrically connected to the mixing module 31 through the plurality of filters 4. Specifically, for each filter 4, the input end thereof is electrically connected to one output port of the seventh shunt 23, and the output end thereof is electrically connected to one input port of the three-port mixer. The filter 4 is used to eliminate the interference signals in each frequency conversion signal between the seventh shunt 23 and the mixing module 31, so as to improve the purity and accuracy of the frequency conversion signal. The embodiment shown in FIG. 19 is only used to illustrate the arrangement mode of the filter, and the arrangement of the filter can be adjusted according to the actual situation in the specific implementation. For example, for the embodiments shown in FIGS. 15-18, the filter can be arranged according to the actual situation with reference to FIG. 19, as long as it can eliminate the interference signals in the frequency conversion signal and improve the purity and accuracy of the frequency conversion signal, and the specific implementation is not limited herein.

[0180] FIG. 20 is a twentyth schematic diagram of the circuit structure of the passive frequency conversion circuit according to an embodiment of the present disclosure, and FIG. 21 is a twentyfirst schematic diagram of the circuit structure of the passive frequency conversion circuit according to an embodiment of the present disclosure.

[0181] The difference between the embodiment shown in FIG. 20 and the embodiment shown in FIG. 21 and the embodiment shown in FIG. 19 is that the passive frequency conversion circuit further comprises a coupler 26 and a rectifier 27 in the embodiment shown in FIG. 20 and the embodiment shown in FIG. 21. In some embodiments, as shown in FIGS. 20 and 21, the coupler 26 and the rectifier 27 can be divided in the frequency division circuit 1. In some embodiments, the coupler 26 and the rectifier 27 can also be arranged independently of the frequency division circuit 1 to form an independent circuit unit, and the specific implementation is not limited herein.

[0182] In some embodiments, as shown in FIG. 20, the coupler 26 is located before the attenuator 21. The coupler 26 is electrically connected to the attenuator 21 and the rectifier 27 respectively. The rectifier 27 is also electrically connected to the first amplifier 25 and the second amplifier 32 respectively. The coupler 26 is configured to receive an external signal as the signal inlet of the passive frequency conversion circuit, and transmit part of the external signal to the attenuator 21 and couple part of the external signal to the rectifier 27. The part of the external signal transmitted to the attenuator 21 is attenuated by the attenuator 21 to form a transparent signal and a mixing signal. The part of the external signal transmitted to the rectifier 27 is rectified by the rectifier to direct current, and is output to the first amplifier 25 and the second amplifier 32 respectively as the direct current power supply for signal amplification of the first amplifier 25 and the second amplifier 32. In this embodiment, the signal current coupled out by the coupler 26 is rectified to be used as the direct current power supply for the first amplifier 25 and the second amplifier 32, so that a separate external power supply can be avoided, and the circuit structure is simplified.

[0183] In some embodiments, as shown in FIG. 21, the coupler 26 is located between the attenuator 21 and the sixth splitter 22. The coupler 26 is electrically connected with the attenuator 21, the sixth splitter 22 and the rectifier 27 respectively. The rectifier 27 is also electrically connected with the first amplifier 25 and the second amplifier 32 respectively. The coupler 26 is configured to receive the external signal output by the attenuator 21, and transmit part of the external signal to the sixth splitter 22 and part of the external signal to the rectifier 27. The part of the external signal transmitted to the sixth splitter 22 is used to form the pass-through signal and the mixed signal. The part of the external signal transmitted to the rectifier 27 is rectified into direct current by the rectifier, and output to the first amplifier 25 and the second amplifier 32 respectively as the direct current power source of the first amplifier 25 and the second amplifier 32 for signal amplification. In this embodiment, by rectifying the signal current coupled out by the coupler 26 and using it as the direct current power source of the first amplifier 25 and the second amplifier 32, a separate external power source can be avoided, and the circuit structure is simplified.

[0184] It should be noted that the embodiments shown in FIG. 20 and FIG. 21 are used to illustrate the setting mode of the coupler 26 and the rectifier 27 in the passive frequency conversion circuit. In specific implementation, in any of the embodiments shown in FIG. 15 to FIG. 19, the coupler 26 and the rectifier 27 can be set according to FIG. 20 or FIG. 21, and details are not described herein.

[0185] FIG. 22 is a structural schematic diagram of a multiple-input and multiple-output signal transmission device provided by an embodiment of the present disclosure.

[0186] The second aspect of the embodiments of the present disclosure also provides a multi-input multi-output signal transmission device. As shown in FIG. 22, the multi-input multi-output signal transmission device provided by the embodiments of the present disclosure includes an external signal transmission cable 200, a first antenna unit 301, a second antenna unit 302, and the passive frequency conversion circuit 100 provided by any of the foregoing embodiments. The external signal transmission cable 200 is electrically connected to the frequency division circuit 1 of the passive frequency conversion circuit 100. The external signal transmission cable 200 is configured to input an external signal to the frequency division circuit 1. Specifically, one end of the external signal transmission cable 200 can be connected to an RU unit, and the other end can be connected to an input port of the frequency division circuit 1, so that the external signal output by the RU unit is transmitted to the passive frequency conversion circuit 100 through the external signal transmission cable 200. The external signal transmission cable 200 can be an optical fiber, a coaxial cable, a twisted pair, etc., which is not limited herein. The first antenna unit 301 is electrically connected to the transparent transmission circuit 2 of the passive frequency conversion circuit 100. The first antenna unit 301 is configured to receive the transparent transmission signal output by the transparent transmission circuit 2 and send electromagnetic wave signals to the outside world. The number of the first antenna unit 301 can be one or more, which is not limited herein. The first antenna unit 301 can be a spotlight antenna or other outdoor high-power antenna, which is not limited herein. The second antenna unit 302 is electrically connected to the frequency mixing circuit 3 of the passive frequency conversion circuit 100. The second antenna unit 302 is configured to receive the frequency mixing signal output by the frequency mixing circuit 3 and send electromagnetic wave signals to the outside world. The number of the second antenna unit 302 can be one or more, which is not limited herein. The second antenna unit 302 can be a spotlight antenna or other outdoor high-power antenna, which is not limited herein.

[0187] The specific structure and connection mode of the multi-input multi-output signal transmission device provided by the embodiments of the present disclosure can refer to the specific structure of the passive frequency conversion circuit provided by any of the foregoing embodiments, which is not repeated herein. In specific implementation, the multi-input multi-output signal transmission device provided by the embodiments of the present disclosure can be a network device such as a 5G network base station, which is not limited herein. The multi-input multi-output signal transmission device provided by the embodiments of the present disclosure has the same or similar technical effects as the passive frequency conversion circuit provided by any of the foregoing embodiments in specific implementation, which is not repeated herein.

[0188] FIG. 23 is a structural schematic diagram of the multi-input multi-output signal transmission device provided by the embodiments of the present disclosure.

[0189] The third aspect of the embodiments of the present disclosure also provides an antenna. As shown in FIG. 23, the antenna provided by the embodiments of the present disclosure includes the first antenna unit 301, the second antenna unit 302 and the passive frequency conversion circuit 100 provided by any of the foregoing embodiments. The first antenna unit 301 is electrically connected with the transparent transmission circuit 2 of the passive frequency conversion circuit 100. The first antenna unit 301 is configured to receive the transparent transmission signal output by the transparent transmission circuit 2 and send electromagnetic wave signals to the outside world. The number of the first antenna unit 301 can be one or more, which is not limited herein. The second antenna unit 302 is electrically connected with the mixing circuit 3 of the passive frequency conversion circuit 100. The second antenna unit 302 is configured to receive the mixed frequency signal output by the mixing circuit 3 and send electromagnetic wave signals to the outside world. The number of the second antenna unit 302 can be one or more, which is not limited herein. The antenna provided by the embodiments of the present disclosure can realize multi-input and multi-output transmission of high-power multi-frequency signals and can be applied to the erection of indoor or outdoor distribution systems of communication networks such as 5G, thereby improving the signal transmission efficiency and communication quality. The structure of the antenna provided by the embodiments of the present disclosure can refer to the specific structure of the passive frequency conversion circuit provided by any of the foregoing embodiments in the specific implementation, and has the same or similar technical effects as the passive frequency conversion circuit provided by any of the foregoing embodiments, which will not be described herein.

[0190] Although the preferred embodiments of the present disclosure have been described, those skilled in the art can make additional changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all the preferred embodiments and all the changes and modifications falling within the scope of the present disclosure.

[0191] Obviously, various modifications and changes can be made to the present disclosure by those skilled in the art without departing from the spirit and scope of the present disclosure. Thus, it is intended that the present disclosure also include all such modifications and changes as fall within the scope of the claims of the present disclosure and their equivalents.

Claims

1. A passive frequency converter circuit, wherein, include: Frequency divider circuit, pass-through circuit, and mixer circuit; The frequency division circuit is electrically connected to the transparent transmission circuit and the mixing circuit, respectively. The frequency divider circuit is configured to receive an external signal input and divide the external signal into a transparent signal and / or a multi-channel frequency conversion signal; the maximum input power of the frequency divider circuit is greater than or equal to 38dBm; The pass-through circuit is configured to receive the pass-through signal and output the pass-through signal; the pass-through signal includes a signal of at least one frequency band. The mixing circuit is configured to receive multiple frequency conversion signals, mix the multiple frequency conversion signals into a mixed signal, and then output the mixed signal; the frequency band of the mixed signal is the same as the frequency band of at least a portion of the signals in the transparent transmission signal.

2. The passive frequency converter circuit as described in claim 1, wherein, The frequency division circuit includes an input duplexer and a first splitter; the input duplexer is electrically connected to the first splitter and the transparent transmission circuit respectively; the first splitter is further divided into multiple paths and electrically connected to the mixer circuit. The ingress duplexer is configured to receive the external signal and divide the external signal into a first frequency band signal and / or a second frequency band signal; the maximum input power of the ingress duplexer is greater than or equal to 38 dBm. The first frequency band signal is output from the input duplexer to the transparent transmission circuit; all first frequency band signals are transparent transmission signals. The second frequency band signal is output from the input duplexer to the first splitter; The second frequency band signal includes the frequency conversion signal; the frequency conversion signal is split into multiple paths by the first splitter and output to the mixer circuit.

3. The passive frequency converter circuit as described in claim 2, wherein, The first splitter is also electrically connected to the transparent transmission circuit; The second frequency band signal also includes the transparent transmission signal, which is output to the transparent transmission circuit by the first splitter.

4. The passive frequency converter circuit as described in claim 3, wherein, The transparent transmission circuit is a metal cavity duplexer.

5. The passive frequency converter circuit as described in claim 3, wherein, The first splitter is a tripod; the mixer circuit is a three-port mixer. The first splitter is divided into two paths and electrically connected to the mixer circuit; the frequency conversion signal is split into two paths by the first splitter and output to the mixer circuit.

6. The passive frequency converter circuit as described in claim 2, wherein, It also includes multiple filters; The filters are respectively disposed on the multi-signal line between the first splitter and the mixer circuit, and the first splitter is electrically connected to the mixer circuit through the filters.

7. The passive frequency converter circuit according to any one of claims 2 to 6, wherein, The inlet duplexer is a metal cavity duplexer.

8. The passive frequency converter circuit as described in claim 1, wherein, The frequency division circuit includes a power divider, a second splitter, a third splitter, a fourth splitter, and a fifth splitter; The power divider is electrically connected to the second splitter and the third splitter respectively; the second splitter is also electrically connected to the pass-through circuit and the fourth splitter respectively; the fourth splitter is further divided into multiple channels and electrically connected to the mixer circuit; the third splitter is also electrically connected to the pass-through circuit and the fifth splitter respectively; the fifth splitter is further divided into multiple channels and electrically connected to the mixer circuit. The power divider is configured to receive the external signal and divide the external signal into a first power signal and a second power signal; the frequency bands of the first power signal and the second power signal are the same as the frequency band of the received external signal, and the power of the first power signal and the power of the second power signal are both less than the power of the external signal; the maximum input power of the power divider is greater than or equal to 38dBm. The second splitter is configured to receive the first power signal and divide the first power signal into a first frequency band signal and / or a second frequency band signal; the third splitter is configured to receive the second power signal and divide the second power signal into a first frequency band signal and / or a second frequency band signal. The first frequency band signal is output to the transparent transmission circuit by the second splitter and the third splitter respectively; the first frequency band signal is the transparent transmission signal; The second frequency band signal is output from the second splitter to the fourth splitter, and from the third splitter to the fifth splitter; The second frequency band signal includes the frequency conversion signal; the frequency conversion signal is divided into multiple outputs to the mixing circuit by the fourth splitter and the fifth splitter.

9. The passive frequency converter circuit as described in claim 8, wherein, Both the second and third splitters are low-temperature co-fired ceramic duplexers or dielectric duplexers.

10. The passive frequency converter circuit as described in claim 8, wherein, The fourth splitter and the fifth splitter are also electrically connected to the transparent transmission circuit, respectively; The second frequency band signal also includes the transparent transmission signal; the transparent transmission signal in the second frequency band signal is output to the transparent transmission circuit by the fourth splitter and the fifth splitter respectively.

11. The passive frequency converter circuit as described in claim 10, wherein, The transparent circuit is a cavity combiner.

12. The passive frequency converter circuit as described in claim 10, wherein, Both the fourth and fifth splitters are three-way switches; the three-way switches are low-temperature co-fired ceramic three-way switches. The fourth and fifth splitters are each divided into two paths and electrically connected to the mixing circuit; the frequency conversion signal is divided into two paths by the fourth splitter and output to the mixing circuit, and the signal is divided into two paths by the fifth splitter and output to the mixing circuit.

13. The passive frequency converter circuit as described in claim 10, wherein, The frequency division circuit also includes a first combiner and a second combiner; The second splitter and the third splitter are electrically connected to the first combiner, and are electrically connected to the transparent transmission circuit through the first combiner; the fourth splitter and the fifth splitter are electrically connected to the second combiner, and are electrically connected to the transparent transmission circuit through the second combiner. The first combiner is configured to receive the first frequency band signals from the second splitter and the third splitter respectively, combine them into one channel and output them to the transparent transmission circuit; The second combiner is configured to receive the transparent signals from the fourth splitter and the fifth splitter respectively, combine them into one signal, and output it to the transparent circuit.

14. The passive frequency converter circuit as described in claim 8, wherein, The frequency division circuit further includes a plurality of third combiners; each of the plurality of third combiners is electrically connected to the fourth splitter, the fifth splitter and the mixer circuit respectively; Each of the third combiners is configured to combine one of the multiple frequency conversion signals output by the fourth splitter with one of the multiple frequency conversion signals output by the fifth splitter into a single frequency conversion signal, and output it to the mixer circuit. The mixing circuit includes a mixer.

15. The passive frequency converter circuit as described in claim 8, wherein, The mixing circuit includes a mixer and a plurality of third combiners; each of the plurality of third combiners is electrically connected to the fourth splitter, the fifth splitter and the mixer, respectively; Each of the third combiners is configured to combine one of the multiple frequency conversion signals output by the fourth splitter and one of the multiple frequency conversion signals output by the fifth splitter into a single frequency conversion signal, and output it to the mixer.

16. The passive frequency converter circuit as described in claim 8, wherein, It also includes multiple filters; the multiple filters are respectively disposed on the multi-channel signal line between the fourth splitter and the mixer circuit, and respectively disposed on the multi-channel signal line between the fifth splitter and the mixer circuit, the fourth splitter and the fifth splitter being electrically connected to the mixer circuit through the filters.

17. The passive frequency converter circuit according to any one of claims 8 to 16, wherein, The power divider is a cavity power divider.

18. The passive frequency converter circuit as described in claim 1, wherein, The frequency division circuit includes an attenuator, a sixth splitter, and a seventh splitter; the pass-through circuit includes a pass-through module and a first amplifier connected to each other; the mixing circuit includes a mixing module and a second amplifier connected to each other. The attenuator is electrically connected to the sixth splitter; the sixth splitter is also electrically connected to the seventh splitter and the transparent transmission module; the seventh splitter is further divided into multiple channels and electrically connected to the mixer module. The attenuator is configured to receive the external signal, reduce the external signal, and output it to the sixth splitter. The sixth splitter is configured to divide the reduced external signal into a first frequency band signal and / or a second frequency band signal; The first frequency band signal is output to the transparent transmission module by the sixth splitter; all first frequency band signals are transparent transmission signals; the first amplifier is configured to receive the transparent transmission signal output by the transparent transmission module, and amplify the transparent transmission signal before outputting it. The second frequency band signal is output from the sixth splitter to the seventh splitter; The second frequency band signal includes the frequency conversion signal; the frequency conversion signal is split into multiple paths by the seventh splitter and output to the mixing module; the second amplifier is configured to receive the mixing signal output by the mixing module and amplify the mixing signal before outputting it.

19. The passive frequency converter circuit as described in claim 18, wherein, The seventh splitter is also electrically connected to the transparent transmission module; The second frequency band signal also includes the transparent transmission signal, which is output to the transparent transmission module by the seventh splitter.

20. The passive frequency converter circuit as described in claim 19, wherein, The transparent transmission module is a low-temperature co-fired ceramic duplexer or a dielectric duplexer.

21. The passive frequency converter circuit as described in claim 19, wherein, The seventh splitter is a tripod; the tripod is a low-temperature co-fired ceramic tripod; the mixer module is a three-port mixer; The seventh splitter is divided into two paths and electrically connected to the mixing module; the frequency conversion signal is divided into two paths by the seventh splitter and output to the mixing module.

22. The passive frequency converter circuit as described in claim 18, wherein, It also includes multiple filters; Multiple filters are disposed on the multi-channel signal line between the seventh splitter and the mixer module, and the seventh splitter is electrically connected to the mixer module through the filters.

23. The passive frequency converter circuit as described in claim 18, wherein, The passive frequency converter circuit also includes a coupler and a rectifier; The coupler is located before the attenuator; the coupler is electrically connected to both the attenuator and the rectifier; the rectifier is also electrically connected to both the first amplifier and the second amplifier. The coupler is configured to receive the external signal and transmit a portion of the external signal to the attenuator and a portion coupled out to the rectifier; The rectifier is configured to rectify the signal current coupled out of the coupler into DC current and output it to the first amplifier and the second amplifier, respectively.

24. The passive frequency converter circuit as described in claim 18, wherein, The passive frequency converter circuit also includes a coupler and a rectifier; The coupler is located between the attenuator and the sixth splitter; the coupler is electrically connected to the attenuator, the sixth splitter and the rectifier respectively; the rectifier is also electrically connected to the first amplifier and the second amplifier respectively; The coupler is configured to receive the external signal output by the attenuator and transmit part of the external signal to the sixth splitter and part of it to the rectifier; The rectifier is configured to rectify the signal current coupled out of the coupler into DC current and output it to the first amplifier and the second amplifier, respectively.

25. The passive frequency converter circuit according to any one of claims 3-5, 10-13, and 19-21, wherein, The frequency of the first frequency band signal is greater than the frequency of the second frequency band signal; The frequency of the frequency conversion signal is greater than the frequency of the transparent transmission signal in the second frequency band signal.

26. A multiple-input multiple-output signal transmission device, wherein, Includes an external signal transmission cable, a first antenna unit, a second antenna unit, and a passive frequency conversion circuit as described in any one of claims 1 to 25; The external signal transmission cable is electrically connected to the frequency divider circuit of the passive frequency converter; the external signal transmission cable is configured to input an external signal to the frequency divider circuit. The first antenna unit is electrically connected to the pass-through circuit of the passive frequency conversion circuit; the first antenna unit is configured to receive the pass-through signal output by the pass-through circuit and send electromagnetic wave signals to the outside. The second antenna unit is electrically connected to the mixer circuit of the passive frequency converter circuit; the second antenna unit is configured to receive the mixer signal output by the mixer circuit and send electromagnetic wave signals to the outside world.

27. An antenna, wherein, Includes a first antenna unit, a second antenna unit, and a passive frequency conversion circuit as described in any one of claims 1 to 25; The first antenna unit is electrically connected to the pass-through circuit of the passive frequency conversion circuit; the first antenna unit is configured to receive the pass-through signal output by the pass-through circuit and send electromagnetic wave signals to the outside. The second antenna unit is electrically connected to the mixer circuit of the passive frequency converter circuit; the second antenna unit is configured to receive the mixer signal output by the mixer circuit and send electromagnetic wave signals to the outside world.

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