Radio frequency module and low-orbit satellite communication equipment

Abstract

The utility model relates to a radio frequency module and low-orbit satellite communication equipment. The radio frequency module comprises a transmitting path, a first receiving path and a second receiving path, particularly, the number of radio frequency elements in the radio frequency module is reduced through the design that multiple wavebands share one transmitting path, insufficient transmitting power is avoided through the arrangement of a plurality of power amplifiers, multiband compatibility is achieved, further, a power divider in the transmitting path is designed, and the multi-band compatibility is achieved. Through the arrangement of the isolation resistor in the radio frequency module, the passing characteristic of the transmitted frequency band is not reduced while the radio frequency module is adapted to the transmission of the multi-band radio frequency information.

Description

Technical Field

[0001] The utility model relates to the field of communication equipment, and more specifically, to a radio frequency module and low-orbit satellite communication equipment. Background Art

[0002] With the development of the application of communication technology, communication devices such as mobile phones, notebooks, personal digital assistants (PDA), global positioning systems (GPS) and Beidou need to communicate through various communication networks. However, with the rapid development of communication systems, satellite frequency bands are becoming increasingly crowded. For example, satellite frequency bands may include frequency bands supported by the fourth generation mobile communication technology (4G), frequency bands supported by the fifth generation mobile communication technology (5G), mobile hotspots (WiFi), Bluetooth, near field communications (NFC), and other frequency bands required for different applications, etc.

[0003] In the prior art, when the communication device needs to support more frequency bands, the number of RF components used in the communication device, such as power amplifiers, RF switches SW, antennas, etc., will also increase significantly. The increase in the above RF components will lead to an increase in the volume and system complexity of the communication device, which is not conducive to the design, packaging or miniaturization of the communication device. In order to achieve the miniaturization of communication equipment in the prior art, a compatible design of multiple frequency bands is adopted for the RF module. However, the existing compatible design easily leads to insufficient transmission power of the RF signal.

[0004] Therefore, it is expected in the industry to provide a RF module that is compatible with multiple frequency bands, reduce the number of components used in the RF module and improve the transmission power of the RF signal. Utility Model Content

[0005] In view of the above technical problems, the present invention provides a new radio frequency module structure and a communication device including the same, so as to facilitate the design, packaging or miniaturization of the communication device and the compatibility of the frequency band.

[0006] A brief summary of the content of the present invention will be given below in order to provide a basic understanding of certain aspects of the content of the present invention. It should be understood that this summary is not an exhaustive summary of the content of the present invention. It is not intended to identify the key or important parts of the content of the present invention, nor is it intended to limit the scope of the content of the present invention. Its purpose is simply to give certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0007] According to one aspect of the present invention, a radio frequency module is provided, comprising: a transmitting path, the transmitting path comprising a radio frequency signal transmitting port, a power divider, an even number of power amplifiers, a power combiner, a radio frequency switch and an antenna port; wherein the radio frequency signal transmitting port is connected to an input terminal of the power divider, a first output terminal of the power divider is connected to an input end of a first power amplifier, a second output terminal of the power divider is connected to an input end of a second power amplifier, an output end of the first power amplifier is connected to a first input terminal of the power combiner, an output end of the second power amplifier is connected to a second input terminal of the power combiner, an output terminal of the power combiner is connected to a second terminal of the radio frequency switch, and a first terminal of the radio frequency switch is connected to the antenna port; a receiving path, the receiving path comprising a radio frequency signal transmitting port, a power divider, an even number of power amplifiers, a power combiner, a radio frequency switch and an antenna port; wherein the radio frequency signal transmitting port is connected to an input terminal of the power divider, a first output terminal of the power divider is connected to an input end of a first power amplifier, a second output terminal of the power divider is connected to an input end of a second power amplifier, an output end of the first power amplifier is connected to a first input terminal of the power combiner, an output terminal of the power combiner is connected to a second terminal of the radio frequency switch, and a first terminal of the radio frequency switch is connected to the antenna port; The receiving path includes a first receiving path and a second receiving path; wherein the first receiving path includes a first receiving port, a first filter, a first low noise amplifier, a radio frequency switch and an antenna port; wherein the third terminal of the antenna port is connected to the input end of the first low noise amplifier, the output end of the first low noise amplifier is connected to the input end of the first filter, and the output end of the first filter is connected to the first receiving port; the second receiving path includes a second receiving port, a second filter, a second low noise amplifier, a radio frequency switch and an antenna port; wherein the fourth terminal of the antenna port is connected to the input end of the second low noise amplifier, the output end of the second low noise amplifier is connected to the input end of the second filter, and the output end of the second filter is connected to the second receiving port.

[0008] Furthermore, there is a first structural unit between the input terminal of the power divider and the first output terminal of the power divider, a second structural unit between the input terminal of the power divider and the second output terminal of the power divider, and an isolation unit between the first structural unit and the second structural unit.

[0009] Further, the first structural unit and the second structural unit are T-shaped structural units, and the isolation unit is arranged between the first output terminal and the second output terminal; wherein the first structural unit includes an inductor L1 and an inductor L3 connected in series between the input terminal of the power divider and the first output terminal of the power divider; a capacitor C1 is connected between the connection point between the inductor L1 and the inductor L3 and the ground; the second structural unit includes an inductor L2 and an inductor L4 connected in series between the input terminal of the power divider and the second output terminal of the power divider. A capacitor C2 is connected between the connection point between the inductor L2 and the inductor L4 and the ground.

[0010] Furthermore, the first structural unit and the second structural unit are π-type structural units, and the isolation unit is arranged between the first output terminal of the power divider and the second output terminal of the power divider; the first structural unit includes an inductor L5 connected in series between the input terminal of the power divider and the first output terminal of the power divider; a capacitor C3 connected between the input terminal of the power divider and the ground; a capacitor C4 connected between the first output terminal of the power divider and the ground; the second structural unit includes an inductor L6 connected in series between the input terminal of the power divider and the second output terminal of the power divider; a capacitor C3 connected between the input terminal of the power divider and the ground; and a capacitor C5 connected between the second output terminal of the power divider and the ground.

[0011] Furthermore, the first structural unit includes a composite π-type structural unit consisting of two first π-type structural units connected in series and a third π-type structural unit consisting of a capacitor and an inductor; the second structural unit includes a composite π-type structural unit consisting of two second π-type structural units connected in series and a fourth π-type structural unit consisting of a capacitor and an inductor; one end of the isolation unit is arranged at the connection point of the first π-type structural unit and the third π-type structural unit, and the other end of the isolation unit is arranged at the connection point of the second π-type structural unit and the fourth π-type structural unit.

[0012] Further, the first π-type structural unit includes an inductor L5 connected in series between the connection point of the first π-type structural unit and the third π-type structural unit and the input terminal of the power divider; a capacitor C3 connected between the input terminal of the power divider and the ground; a capacitor C4 connected between the connection point of the first π-type structural unit and the third π-type structural unit and the ground; the second π-type structural unit includes an inductor L6 connected in series between the connection point of the second π-type structural unit and the fourth π-type structural unit and the input terminal of the power divider; a capacitor C5 connected between the input terminal of the power divider and the ground. A capacitor C6 connected between the connection point of the second π-type structural unit and the fourth π-type structural unit and the ground; the third π-type structural unit includes an inductor L7 connected in series between the connection point of the first π-type structural unit and the third π-type structural unit and the first output terminal; a capacitor C7 connected between the connection point of the first π-type structural unit and the third π-type structural unit and the ground; a capacitor C8 connected between the first output terminal of the power divider and the ground; and the fourth π-type structural unit includes an inductor L8 connected in series between the input terminal N2 and the second output terminal. A capacitor C9 connected between a connection point between the second π-type structure unit and the fourth π-type structure unit and ground; and a capacitor C10 connected between a second output terminal of the power divider and ground.

[0013] Furthermore, the output terminal of the power divider divides the radio frequency signal into an even number of radio frequency signals with equal power; and the isolation unit is composed of an isolation resistor with a resistance value of 50 ohms.

[0014] Furthermore, the structure of the power combiner is the same as that of the power divider.

[0015] Furthermore, the first receiving path is used to receive S-band radio frequency signals, and the second receiving path is used to receive L-band radio frequency signals.

[0016] According to another aspect of the present invention, a low-orbit satellite communication device is provided, which includes a radio frequency module as described in any one of the above items. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specific contents of the present invention are described below with reference to the accompanying drawings, which will help to more easily understand the above and other purposes, features and advantages of the present invention. The accompanying drawings are only for illustrating the principles of the present invention. The sizes and relative positions of the units in the accompanying drawings do not have to be drawn to scale.

[0018] Figure 1 The schematic diagram of the circuit structure of the radio frequency module provided by the utility model is shown;

[0019] Figure 2 Shown is a structural block diagram of the power divider SP of the utility model;

[0020] Figure 3 The first specific circuit structure of the power divider of the utility model is shown;

[0021] Figure 4 The second specific circuit structure of the power divider of the utility model is shown;

[0022] Figure 5 The third specific circuit structure of the power divider of the utility model is shown. DETAILED DESCRIPTION

[0023] Below, exemplary disclosures of the present invention are described in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of implementing the present invention are described in the specification. However, it should be understood that many decisions specific to the present invention may be made in the process of developing any such implementation of the present invention in order to achieve the developer's specific goals, and these decisions may vary from one implementation to another.

[0024] It should also be noted that, in order to avoid obscuring the content of the present invention due to unnecessary details, only the device structure closely related to the solution according to the content of the present invention is shown in the accompanying drawings, while other details that are not closely related to the content of the present invention are omitted.

[0025] It should be understood that the present invention is not limited to the described implementation forms due to the following description with reference to the accompanying drawings. Herein, where feasible, features between different implementations may be replaced or borrowed, and one or more features may be omitted in one implementation.

[0026] See also Figure 1 , Figure 1 The circuit structure diagram of the radio frequency module provided by the utility model is shown. Specifically, the radio frequency module includes a transmitting path, a radio frequency switch SW and a receiving path.

[0027] Among them, the RF module realizes the switching of the transmitting path and the receiving path through the RF switch SW.

[0028] The transmission path is used to transmit the RF signal generated by the communication device to the outside. The transmission path includes an RF signal transmission port Tx, a power splitter SP, multiple power amplifiers, a power combiner CO, an RF switch SW and an antenna port ANT. The power splitter SP distributes the power of the RF signal generated by the communication device. The power amplifier amplifies the power of the received RF signal, and the power combiner CO synthesizes the amplified RF signal into one output. For example, Figure 1 As shown, in the present invention, the transmitting port Tx is connected to the input terminal of the power divider SP, the first output terminal of the power divider SP is connected to the input end of the first power amplifier PA1, the second output terminal of the power divider SP is connected to the input end of the second power amplifier PA2, the output end of the first power amplifier PA1 is connected to the first input terminal of the power combiner CO, the output end of the second power amplifier PA2 is connected to the second input terminal of the power combiner CO, the output terminal of the power combiner CO is connected to the second terminal of the RF switch SW, and the first terminal of the RF switch SW is connected to the antenna port ANT. It should be understood that Figure 1 The two power amplifiers in the invention do not serve as a specific limitation on the number of power amplifiers in the transmitting path of the RF module provided by the present invention. However, it should be understood that the power amplifiers in the present invention are preferably set to an even number. It is further understandable that the number of output terminals of the power divider SP and the number of input terminals of the power combiner CO are the same as the number of power amplifiers, that is, the number of output terminals of the power divider SP and the number of input terminals of the power combiner CO are also even numbers. In the present invention, it is preferred to realize the division of the signal generated by the communication device into equal power distribution with equal power through the output terminal of the power divider SP. It should be pointed out that the power divider SP in the present invention can also perform unequal power distribution on the RF signal generated by the communication device, and the present invention does not make specific limitations on it. In the present invention, the above-mentioned setting enables the power amplifier to simultaneously amplify the power of the received RF signal, and after synthesis by the power combiner CO, the power value of the output RF signal can be improved, thereby achieving high power output.

[0029] The receiving path is used to transmit the external signal to the communication device. The receiving path in the present invention includes a first receiving path and a second receiving path. For example, Figure 1 As shown, the first receiving path includes a first receiving port Rx_S, a first filter F1, a first low noise amplifier LNA1, a radio frequency switch SW and an antenna port ANT. The third terminal of the antenna port ANT is connected to the input end of the first low noise amplifier LNA1, the output end of the first low noise amplifier LNA1 is connected to the input end of the first filter F1, and the output end of the first filter F1 is connected to the first receiving port Rx_S. It can be understood that the first filter F1 in the utility model can adopt any type of filter. Preferably, the filter in the utility model adopts a filter constructed by a thin film bulk acoustic resonator.

[0030] The second receiving path includes a second receiving port Rx_L, a second filter F2, a second low noise amplifier LNA2, a radio frequency switch SW and an antenna port ANT. The fourth terminal of the antenna port ANT is connected to the input of the second low noise amplifier LNA2, the output of the second low noise amplifier LNA2 is connected to the input of the second filter F2, and the output of the second filter F2 is connected to the second receiving port Rx_L. It can be understood that the second filter F2F2 in the present invention can adopt any type of filter. Preferably, the filter in the present invention adopts a filter constructed by a thin film bulk acoustic resonator.

[0031] Figure 1 In the example, the first receiving path is used to receive S-band radio frequency signals, and the second receiving path is used to receive L-band radio frequency signals. The uplink frequency band of the S-band is 1980-2010MHz, and the downlink frequency band is 2170-2200MHz; the uplink frequency band of the L-band is 1668-1675MHz, and the downlink frequency band is 1518-1525MHz. It can be understood that the first receiving path and the second receiving path of the utility model can also be used for reception of other bands, and this is not a specific limitation on the receiving path bands in the radio frequency module provided by the utility model.

[0032] It can be seen that the utility model realizes multi-band compatibility such as S-band and L-band through the above-mentioned design of the RF module, and reduces the number of RF components in the RF module through the design of multiple bands sharing one transmission path, and avoids insufficient transmission power through the setting of multiple power amplifiers.

[0033] Furthermore, in the present utility model, the power divider SP is carefully designed, and the setting of the isolation resistor in the radio frequency module adapts to the transmission of radio frequency information in multiple frequency bands without reducing the passing characteristics of the transmitted frequency band.

[0034] See also Figure 2 , Figure 2 The structure block diagram of the power divider SP of the utility model is shown as follows: Figure 2 As shown, the power divider SP in the present invention is a three-terminal device, specifically including: an input terminal IN1 of the power divider SP, a first output terminal OUT1 of the power divider SP, and a second output terminal OUT2 of the power divider SP. A first structural unit SP1 is provided between the input terminal IN1 and the first output terminal OUT1, and a second structural unit SP2 is provided between the input terminal and the second output terminal. And an isolation unit SP3 is provided between the first structural unit and the second structural unit. In the present invention, the isolation unit SP3 is composed of an isolation resistor R1, and the resistance value of the isolation resistor R1 is set correspondingly according to the ratio of the signal power input to the first power amplifier PA1 and the signal power input to the second power amplifier PA2.

[0035] In the present invention, the resistance of the isolation resistor R1 is preferably 50 ohms.

[0036] See also Figure 3 , Figure 3 FIG. 1 shows a first specific circuit structure of the power divider of the utility model. Figure 3 As shown, in one embodiment of the present invention, the first structure unit SP1 and the second structure unit SP2 of the power divider SP are T-shaped structure units, and the isolation unit SP3 is arranged between the first output terminal OUT1 and the second output terminal OUT2.

[0037] Specifically, the first structural unit includes an inductor L1 and an inductor L3 connected in series between the input terminal IN1 and the first output terminal OUT1. A capacitor C1 is connected between a connection point between the inductor L1 and the inductor L3 and the ground.

[0038] The second structural unit includes an inductor L2 and an inductor L4 connected in series between the input terminal IN1 and the second output terminal OUT2. A capacitor C2 is connected between the connection point between the inductor L2 and the inductor L4 and the ground. By setting the isolation resistor R1 in coordination with the first structural unit SP1 and the second structural unit SP2, it is possible to support the transmission of multi-band RF signals without reducing the passing characteristics of the transmission band.

[0039] See also Figure 4 , Figure 4The second specific circuit structure of the power divider of the present invention is shown. Alternatively, in another embodiment of the present invention, the first structure unit SP1 and the second structure unit SP2 of the power divider SP are π-type structure units. The isolation unit SP3 is arranged between the first output terminal OUT1 and the second output terminal OUT2.

[0040] Specifically, the first structure unit SP1 includes an inductor L5 connected in series between the input terminal IN1 and the first output terminal OUT1, a capacitor C3 connected between the input terminal IN1 and the ground, and a capacitor C4 connected between the first output terminal OUT1 and the ground.

[0041] The second structure unit SP2 includes an inductor L6 connected in series between the input terminal IN1 and the second output terminal OUT1, a capacitor C3 connected between the input terminal IN1 and the ground, and a capacitor C5 connected between the second output terminal OUT1 and the ground.

[0042] See also Figure 5 , Figure 5 The third specific circuit structure of the power divider of the utility model is shown. Alternatively, in another embodiment of the utility model, the first structural unit and the second structural unit of the power divider SP are composite π-type structural units, that is, the composite π-type structural unit in the first structural unit includes two series-connected first π-type structural units SP11 and third π-type structural units SP12 composed of capacitors and inductors; the composite π-type structural unit in the second structural unit includes two series-connected second π-type structural units SP21 and fourth π-type structural units SP22 composed of capacitors and inductors; one end of the isolation unit SP3 is arranged at the connection point of the first π-type structural unit SP11 and the third π-type structural unit SP12, and the other end of the isolation unit SP3 is arranged at the connection point of the second π-type structural unit SP21 and the fourth π-type structural unit SP22.

[0043] Specifically, the first π-type structure unit SP11 includes an inductor L5 connected in series between the input terminal IN1 and the connection point of the first π-type structure unit SP11 and the third π-type structure unit SP12, a capacitor C3 connected between the input terminal IN1 and the ground, and a capacitor C4 connected between the connection point of the first π-type structure unit SP11 and the third π-type structure unit SP12 and the ground.

[0044] The second π-type structure unit SP12 includes an inductor L6 connected in series between the input terminal IN1 and the connection point of the second π-type structure unit SP21 and the fourth π-type structure unit SP22. A capacitor C5 connected between the input terminal IN1 and the ground. A capacitor C6 connected between the connection point of the second π-type structure unit SP21 and the fourth π-type structure unit SP22 and the ground.

[0045] The third π-type structure unit SP21 includes an inductor L7 connected in series between a connection point between the first π-type structure unit SP11 and the third π-type structure unit SP12 and the first output terminal OUT1, a capacitor C7 connected between a connection point between the first π-type structure unit SP11 and the third π-type structure unit SP12 and ground, and a capacitor C8 connected between the first output terminal OUT1 and ground.

[0046] The fourth π-type structure unit SP22 includes an inductor L8 connected in series between a connection point between the second π-type structure unit SP21 and the fourth π-type structure unit SP22 and the second output terminal OUT2, a capacitor C9 connected between a connection point between the second π-type structure unit SP21 and the fourth π-type structure unit SP22 and ground, and a capacitor C10 connected between the second output terminal OUT2 and ground.

[0047] It can be understood that the structure of the power combiner CO in the radio frequency module provided by the present invention can be the same as the structure of the power divider SP, which will not be described in detail here.

[0048] Furthermore, the RF module can be used in low-orbit satellite communication devices, and the communication devices may be exemplarily home broadband communication equipment, maritime communication equipment, airborne communication equipment, government and special market communication equipment, and satellite Internet of Things communication equipment for low-orbit satellite applications.

[0049] The present invention is described above in conjunction with specific implementation schemes, but those skilled in the art should be aware that these descriptions are exemplary and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make various modifications and variations to the present invention based on the spirit and principles of the present invention, and these modifications and variations are also within the scope of the present invention.

Claims

1. A radio frequency module, characterized in that: include: A transmission path, the transmission path comprising a radio frequency signal transmission port, a power divider, an even number of power amplifiers, a power combiner, a radio frequency switch and an antenna port; The RF signal transmission port is connected to the input terminal of the power divider, the first output terminal of the power divider is connected to the input terminal of the first power amplifier, the second output terminal of the power divider is connected to the input terminal of the second power amplifier, the output terminal of the first power amplifier is connected to the first input terminal of the power combiner, the output terminal of the second power amplifier is connected to the second input terminal of the power combiner, the output terminal of the power combiner is connected to the second terminal of the RF switch, and the first terminal of the RF switch is connected to the antenna port; A receiving path, the receiving path comprising a first receiving path and a second receiving path; The first receiving path includes a first receiving port, a first filter, a first low noise amplifier, a radio frequency switch and an antenna port; wherein the third terminal of the antenna port is connected to the input end of the first low noise amplifier, the output end of the first low noise amplifier is connected to the input end of the first filter, and the output end of the first filter is connected to the first receiving port; The second receiving path includes a second receiving port, a second filter, a second low-noise amplifier, a radio frequency switch and an antenna port; wherein the fourth terminal of the antenna port is connected to the input end of the second low-noise amplifier, the output end of the second low-noise amplifier is connected to the input end of the second filter, and the output end of the second filter is connected to the second receiving port.

2. The radio frequency module according to claim 1, wherein: A first structural unit is provided between the input terminal of the power divider and the first output terminal of the power divider, a second structural unit is provided between the input terminal of the power divider and the second output terminal of the power divider, and an isolation unit is provided between the first structural unit and the second structural unit.

3. The radio frequency module according to claim 2, wherein: The first structural unit and the second structural unit are T-shaped structural units, and the isolation unit is arranged between the first output terminal and the second output terminal; wherein the first structural unit includes an inductor L1 and an inductor L3 connected in series between the input terminal of the power divider and the first output terminal of the power divider; a capacitor C1 is connected between a connection point between the inductor L1 and the inductor L3 and the ground; the second structural unit includes an inductor L2 and an inductor L4 connected in series between the input terminal of the power divider and the second output terminal of the power divider; a capacitor C2 is connected between a connection point between the inductor L2 and the inductor L4 and the ground.

4. The radio frequency module according to claim 2, wherein: The first structural unit and the second structural unit are π-type structural units, and the isolation unit is arranged between the first output terminal of the power divider and the second output terminal of the power divider; the first structural unit includes an inductor L5 connected in series between the input terminal of the power divider and the first output terminal of the power divider; a capacitor C3 connected between the input terminal of the power divider and the ground; a capacitor C4 connected between the first output terminal of the power divider and the ground; the second structural unit includes an inductor L6 connected in series between the input terminal of the power divider and the second output terminal of the power divider; a capacitor C3 connected between the input terminal of the power divider and the ground; and a capacitor C5 connected between the second output terminal of the power divider and the ground.

5. The radio frequency module according to claim 2, wherein: The first structural unit includes a composite π-type structural unit consisting of two first π-type structural units connected in series and a third π-type structural unit consisting of a capacitor and an inductor; the second structural unit includes a composite π-type structural unit consisting of two second π-type structural units connected in series and a fourth π-type structural unit consisting of a capacitor and an inductor; one end of the isolation unit is arranged at the connection point of the first π-type structural unit and the third π-type structural unit, and the other end of the isolation unit is arranged at the connection point of the second π-type structural unit and the fourth π-type structural unit.

6. The radio frequency module according to claim 5, characterized in that: The first π-type structural unit includes an inductor L5 connected in series between the connection point of the first π-type structural unit and the third π-type structural unit and the input terminal of the power divider; a capacitor C3 connected between the input terminal of the power divider and the ground; a capacitor C4 connected between the connection point of the first π-type structural unit and the third π-type structural unit and the ground; the second π-type structural unit includes an inductor L6 connected in series between the connection point of the second π-type structural unit and the fourth π-type structural unit and the input terminal of the power divider; a capacitor C5 connected between the input terminal of the power divider and the ground; a capacitor C4 connected between the connection point of the second π-type structural unit and the fourth π-type structural unit and the ground. The third π-type structure unit includes an inductor L7 connected in series between the connection point of the first π-type structure unit and the third π-type structure unit and the first output terminal; a capacitor C7 connected between the connection point of the first π-type structure unit and the third π-type structure unit and the ground; a capacitor C8 connected between the first output terminal of the power divider and the ground; the fourth π-type structure unit includes an inductor L8 connected in series between the input terminal N2 and the second output terminal; a capacitor C9 connected between the connection point of the second π-type structure unit and the fourth π-type structure unit and the ground; a capacitor C10 connected between the second output terminal of the power divider and the ground.

7. The radio frequency module according to any one of claims 2 to 6, characterized in that: The output terminal of the power divider divides the radio frequency signal into an even number of radio frequency signals with equal power; the isolation unit is composed of an isolation resistor with a resistance value of 50 ohms.

8. The radio frequency module according to claim 7, wherein: The structure of the power combiner is the same as that of the power divider.

9. The radio frequency module according to any one of claims 1 to 6 and 8, characterized in that: The first receiving path is used to receive S-band radio frequency signals, and the second receiving path is used to receive L-band radio frequency signals.

10. A low-orbit satellite communication device, characterized in that: The communication device includes the radio frequency module described in claims 1-9.

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