Radio frequency front-end module, radio frequency system and electronic equipment

Abstract

The invention provides a radio frequency front-end module, a radio frequency system and electronic equipment, and the radio frequency system comprises a radio frequency transceiver module which comprises at least one first receiving port and at least one second receiving port; the first receiving path is electrically connected with the first receiving port, and the first receiving path is used for receiving a radio frequency signal of a first frequency band; the second receiving path is used for receiving a radio frequency signal of a second frequency band; the third receiving path is used for receiving the radio frequency signal of the first frequency band; the first end of the front end side of the front end switch is electrically connected with the second receiving port, the first selection end of the rear end side of the front end switch is electrically connected with the second receiving access, the second selection end of the rear end side of the front end switch is electrically connected with the third receiving access, and the front end switch is switched to conduct the second receiving port and the second receiving access or the third receiving access. Therefore, the first frequency band and the second frequency band multiplex the receiving port of the radio frequency transceiver module, the number of radio frequency ports is reduced under the condition of supporting more frequency bands, and a radio frequency system is more miniaturized.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and in particular, to a radio frequency front-end module, a radio frequency system, and an electronic device. Background Art

[0002] With the development of communication technologies, the number of frequency bands that electronic devices need to support is increasing. For radio frequency modules, the number of radio frequency links and radio frequency ports that need to be provided is also increasing. Based on this, how to reduce the number of radio frequency links or radio frequency ports while supporting a large number of frequency bands, which is conducive to forming a more miniaturized radio frequency system, has become a technical problem to be solved. Summary of the Invention

[0003] This application provides a more miniaturized radio frequency front-end module, a radio frequency system, and an electronic device.

[0004] In a first aspect, this application provides a radio frequency system, including:

[0005] A radio frequency transceiver module, including at least one first receiving port and at least one second receiving port;

[0006] At least one first receiving path, the first receiving path being electrically connected to the first receiving port, and the first receiving path being configured to receive radio frequency signals in a first frequency band;

[0007] At least one second receiving path, the second receiving path being configured to receive radio frequency signals in a second frequency band;

[0008] At least one third receiving path, the third receiving path being configured to receive the radio frequency signals in the first frequency band; and

[0009] A front-end switch, a first end on the front-end side of the front-end switch being electrically connected to the second receiving port, a first selection end on the back-end side of the front-end switch being electrically connected to the second receiving path, and a second selection end on the back-end side of the front-end switch being electrically connected to the third receiving path.

[0010] The RF system provided by this application. The RF system includes an RF transceiver module, which includes at least one first receiving port and at least one second receiving port; a first receiving path is electrically connected to the first receiving port, and the first receiving path is used to receive RF signals in a first frequency band; a second receiving path is used to receive RF signals in a second frequency band; a third receiving path is used to receive RF signals in the first frequency band; the first end of the front end of the front-end switch is electrically connected to the second receiving port, the first selection end of the back end of the front-end switch is electrically connected to the second receiving path, the second selection end of the back end of the front-end switch is electrically connected to the third receiving path, and the front-end switch realizes the reception ports of the first frequency band and the second frequency band multiplexing the RF transceiver module by switching to conduct the second receiving port and the second receiving path or the third receiving path, reducing the number of RF ports in the case of supporting more frequency bands and making the RF system more miniaturized.

[0011] In a second aspect, this application provides a radio frequency front-end module, including:

[0012] At least one first LNA module, one end of the first LNA module is used to be electrically connected to the first receiving port of the RF transceiver module;

[0013] At least one fourth LNA module, one end of the fourth LNA module is used to be electrically connected to the second receiving port of the RF transceiver module,

[0014] At least one first filtering module, the first filtering module is electrically connected to the other end of the first LNA module, and the first filtering module is used to be electrically connected to the first antenna;

[0015] At least one second filtering module,

[0016] At least one front-end switch, the other end of the first LNA module is electrically connected to the first selection end of the front end of the front-end switch, the first selection end of the back end of the front-end switch is electrically connected to one end of the second filtering module, and the other end of the second filtering module is used to be electrically connected to the first antenna; the second selection end of the back end of the front-end switch is used to be electrically connected to the second antenna.

[0017] The RF front-end module provided by the present application includes at least one first LNA module, at least one fourth LNA module, at least one first filtering module, at least one second filtering module, and at least one front-end switch. One end of the first LNA module is used for electrically connecting to the first receiving port of the RF transceiver module; one end of the fourth LNA module is used for electrically connecting to the second receiving port of the RF transceiver module. The first filtering module is electrically connected to the other end of the first LNA module, and the first filtering module is used for electrically connecting to the first antenna; the other end of the first LNA module is electrically connected to the first selection end on the front-end side of the front-end switch, and the first selection end on the back-end side of the front-end switch is electrically connected to one end of the second filtering module, and the other end of the second filtering module is used for electrically connecting to the first antenna; the second selection end on the back-end side of the front-end switch is used for electrically connecting to the second antenna; the front-end switch realizes that the signals received by the first antenna and the second antenna can share the first LNA module by switching to conduct the first LNA module with the first antenna or the second antenna, reduces the number of LNAs in the case of supporting more frequency bands, and makes the RF system more miniaturized.

[0018] In a third aspect, the present application provides a radio frequency system, including at least one radio frequency front-end module as described in the second aspect.

[0019] In a fourth aspect, the present application provides an electronic device, including the radio frequency system as described in the third aspect. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below.

[0021] Figure 1 It is a schematic structural diagram of an electronic device provided in Embodiment 1 of the present application;

[0022] Figure 2 It is an exploded schematic diagram of an electronic device provided in Embodiment 1 of the present application;

[0023] Figure 3 It is a framework of a radio frequency system provided in Embodiment 2 of the present application Figure 1 ;

[0024] Figure 4 It is a framework of a radio frequency system provided in Embodiment 2 of the present application Figure 2 ;

[0025] Figure 5 It is a framework of a radio frequency system provided in Embodiment 2 of the present application Figure 3 ;

[0026] Figure 6 It is a framework of a radio frequency system provided in Embodiment 2 of the present application Figure 4 ;

[0027] Figure 7 is the framework of a radio frequency system provided in the second embodiment of the present application Figure 5 ;

[0028] Figure 8 is the framework of a radio frequency system provided in the second embodiment of the present application Figure 6 ;

[0029] Figure 9 is the framework of a radio frequency system provided in the second embodiment of the present application Figure 7 ;

[0030] Figure 10 is the framework of a radio frequency system provided in the second embodiment of the present application Figure 8 ;

[0031] Figure 11 is the framework of a radio frequency system provided in the second embodiment of the present application Figure 9 ;

[0032] Figure 12 is the framework of a radio frequency system provided in the second embodiment of the present application Figure 10 ;

[0033] Figure 13 is the framework of a radio frequency system provided in the second embodiment of the present application Figure 10 One;

[0034] Figure 14 is the framework of a radio frequency system provided in the second embodiment of the present application Figure 10 Two;

[0035] Figure 15 is the framework of a radio frequency system provided in the second embodiment of the present application Figure 10 Three;

[0036] Figure 16 is the framework of a radio frequency system provided in the second embodiment of the present application Figure 10 Four;

[0037] Figure 17 is the framework of a radio frequency front-end module provided in the third embodiment of the present application Figure 1 ;

[0038] Figure 18 is the framework of a radio frequency front-end module provided in the third embodiment of the present application Figure 2 ;

[0039] Figure 19 is the framework of a radio frequency front-end module provided in the third embodiment of the present application Figure 3 ;

[0040] Figure 20It is the framework of a radio frequency front-end module provided in Embodiment 3 of the present application Figure 4 ;

[0041] Figure 21 It is the framework of a radio frequency front-end module provided in Embodiment 3 of the present application Figure 5 。

[0042] Explanation of the reference numerals in the drawings:

[0043] Electronic device 1000; display screen 200; middle frame 300; rear cover 400; main board 600; battery 700; secondary board 800; middle plate 310; frame 320; radio frequency system 100; radio frequency transceiver module 10; front-end switch 20; radio frequency front-end module 30; antenna 40; N77 receiving port 11; N77 / N79 receiving port 12; first N77 receiving path 31; N79 receiving path 32; second N77 receiving path 33; first N77 LNA module 311; first N77 filtering module 312; antenna switch 51; first antenna 41; N79 LNA module 321; N79 filtering module 322; second N77 LNA module 331; second N77 filtering module 332; second antenna 42; first radio frequency front-end chip 30a; duplexer 323; first front-end switch 21; second front-end switch 22; N77 transmitting path 61; N79 transmitting path 62; second radio frequency front-end chip 30b; N77 / N79 LNA module 341; first duplexer 323a; second duplexer 323b; N77 transmitting port 14; N77 power amplification module 611; first N77 transceiver switch 612; N79 transmitting port 15; N79 power amplification module 621; N79 transceiver switch 622; second N77 transmitting port 16; coupling module 52; first resistor 53; second resistor 54; switch module 55. Detailed implementation manners

[0044] Next, the technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided in the present application without creative efforts belong to the protection scope of the present application.

[0045] Referring to "embodiment" in the present application means that the specific features, structures or characteristics described in combination with the embodiment may be included in at least one embodiment of the present application. The phrase appears at various positions in the specification does not necessarily refer to the same embodiment, nor is it an exclusive, independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0046] In the description, claims, and above-mentioned drawings of this application, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a component or device that includes one or more parts is not limited to the one or more parts listed, but optionally also includes one or more parts not listed but inherent to the exemplified product, or one or more parts that it should have based on the described functions.

[0047] Please refer to Figure 1 , Figure 1 FIG. is a schematic structural diagram of an electronic device 1000 provided in the first embodiment of this application. The electronic device 1000 includes, but is not limited to, devices with communication functions such as mobile phones, tablet computers, laptop computers, computers, wearable devices, drones, robots, etc. The first embodiment of this application takes a mobile phone as an example for illustration, and other electronic devices can refer to this embodiment.

[0048] Please refer to Figure 2 , Figure 2 FIG. is a partial exploded schematic diagram of the electronic device 1000 provided in the embodiment of this application. Taking the electronic device 1000 as a mobile phone as an example, the working environment of the radio frequency system 100 is illustrated. The electronic device 1000 includes a display screen 200, a middle frame 300, and a rear cover 400 arranged in sequence along the thickness direction. Among them, the middle frame 300 includes a middle plate 310 and a frame 320 surrounding the periphery of the middle plate 310. The frame 320 is a conductive frame, such as a metal frame. Accommodating spaces are formed between the display screen 200 and the middle plate 310, and between the middle plate 310 and the rear cover 400 to accommodate devices such as a main board 600, a camera module, a receiver module, a battery 700, a secondary board 800, and various sensors. One side of the frame 320 along the thickness direction surrounds the edge of the display screen 200, and the other side of the frame 320 along the thickness direction surrounds the edge of the rear cover 400 to form a complete appearance structure of the electronic device 1000. In this embodiment, the frame 320 and the middle plate 310 are an integral structure, and the frame 320 and the rear cover 400 are a split structure. The above is the working environment of the radio frequency system 100 taking a mobile phone as an example, but the radio frequency system 100 of this application is not limited to the above-mentioned working environment.

[0049] Please refer to Figure 3 , the second embodiment of this application provides a radio frequency system 100.

[0050] Please refer to Figure 3, the RF system 100 further includes at least one RF transceiver module 10, at least one front-end switch 20, at least one RF front-end module 30, and at least one antenna 40. Among them, the RF transceiver module 10 includes, but is not limited to, an RF transceiver chip. Further optionally, the RF system 100 further includes a baseband chip.

[0051] Among them, the baseband chip is connected to the RF transceiver chip through a digital interface. The RF transceiver chip is connected to the RF front-end module 30 through an analog signal interface (such as differential I / Q signals). The baseband chip sends configuration instructions to the RF transceiver chip and the RF front end through a control bus to dynamically adjust frequency bands, gains, filter parameters, etc. The baseband chip is responsible for digital signal processing, including at least one of modulation / demodulation, channel encoding / decoding, protocol stack processing, etc. The baseband chip includes, but is not limited to, a digital signal processor, a modulation / demodulation module, an interface unit, etc. The RF transceiver chip is used to complete the conversion between baseband signals and RF signals, including up / down conversion, digital-to-analog conversion, etc. The RF transceiver chip includes, but is not limited to, a mixer, a frequency synthesizer, a digital-to-analog converter, etc. The mixer is used to modulate the baseband signal to the RF frequency band. The frequency synthesizer is used to generate an accurate carrier frequency.

[0052] The RF front-end module 30 is used to amplify the power, filter, and impedance-match the RF signal to ensure signal transmission efficiency. Further optionally, the RF front-end module 30 includes multiple receiving paths, at least one transmitting path, and a transceiver switch. The transceiver switch is used to implement transceiver switching or multi-band switching. The transmitting path includes, but is not limited to, a power amplifier (PA) and a filter. The receiving path includes, but is not limited to, a low-noise amplifier (LNA) and a filter. The antenna 40 is used to realize the mutual conversion between electromagnetic waves and electrical signals. The antenna 40 can cover multiple different frequency bands and support MIMO multi-channel multiplexing. The antenna 40 includes, but is not limited to, a radiation unit, a tuning circuit, etc. The RF front-end module 30 is connected to the antenna 40 through an RF transmission line (such as a microstrip line or a coaxial cable). The above architecture of the RF system 100 can form a transmitting link and a receiving link. Among them, the transmitting link is from the baseband chip → RF transceiver chip (up-conversion) → the transmitting path of the RF front end (power amplification / filtering) → antenna 40. The receiving link is from antenna 40 → the receiving path of the RF front end (filtering / low-noise amplification) → RF transceiver chip (down-conversion) → baseband chip.

[0053] In this embodiment, the number of RF transceiver modules 10 is one, and the number of RF front-end modules 30 is one or two. The number of antennas 40 is 4, or 6, or 8, etc. The number of front-end switches 20 is at least one.

[0054] Please refer to Figure 3 , the RF transceiver module 10 includes at least one N77 receiving port 11 and at least one N77 / N79 receiving port 12.

[0055] Among them, the N77 receiving port 11 is used to receive radio frequency signals in the first frequency band. The N77 / N79 receiving port 12 can not only receive radio frequency signals in the first frequency band, but also receive radio frequency signals in the second frequency band.

[0056] Optionally, the number of N77 receiving ports 11 is one or more. Optionally, the number of N77 / N79 receiving ports 12 is one or more. When the number of N77 / N79 receiving ports 12 is one, that is, one N77 receiving path and one N79 receiving path (time-division) multiplex the receiving port. When the number of N77 / N79 receiving ports 12 is two, that is, two N77 receiving paths can (time-division) multiplex the receiving port with two N79 receiving paths. When the number of N77 / N79 receiving ports 12 is four, that is, four N77 receiving paths can (time-division) multiplex the receiving port with four N79 receiving paths.

[0057] Please refer to Figure 3 , the receiving paths of the radio frequency front-end module 30 include at least one first N77 receiving path 31, at least one N79 receiving path 32, and at least one second N77 receiving path 33.

[0058] Each of the first N77 receiving paths 31 is electrically connected to one of the N77 receiving ports 11. The number of the first N77 receiving paths 31 is the same as the number of the N77 receiving ports 11. The first N77 receiving path 31 is used to receive radio frequency signals in the first frequency band.

[0059] Optionally, the number of the N79 receiving paths 32 is the same as the number of the N77 / N79 receiving ports 12. The number of the second N77 receiving paths 33 can be less than or equal to the number of the N77 / N79 receiving ports 12.

[0060] The N79 receiving path 32 is used to receive radio frequency signals in the second frequency band. The first frequency band is different from the second frequency band.

[0061] Optionally, the first frequency band includes but is not limited to at least one of the LB frequency band (less than 1 GHz), MHB frequency band (1 - 3 GHz), UHB frequency band (greater than 3 GHz), Wi-Fi frequency band, GPS frequency band, etc. For example, the first frequency band is the UHB frequency band. Optionally, the second frequency band includes but is not limited to at least one of the LB frequency band (less than 1 GHz), MHB frequency band (1 - 3 GHz), UHB frequency band (greater than 3 GHz), Wi-Fi frequency band, GPS frequency band, etc. For example, the second frequency band is the UHB frequency band.

[0062] The first frequency band includes the N77 band, and the second frequency band includes the N79 band; or, the first frequency band includes the N79 band, and the second frequency band includes the N77 band.

[0063] The second N77 receiving path 33 is used to receive radio frequency signals in the first frequency band. At least one second N77 receiving path 33 can share a receiving port with the N79 receiving path 32. In other words, the number of second N77 receiving paths 33 can be less than or equal to the number of N79 receiving paths 32.

[0064] The first end on the front end side of the front-end switch 20 is electrically connected to the N77 / N79 receiving port 12. The first selection end on the rear end side of the front-end switch 20 is electrically connected to the N79 receiving path 32. The second selection end on the rear end side of the front-end switch 20 is electrically connected to the second N77 receiving path 33. Among them, the front end side is the side closer to the radio frequency transceiver module 10. The rear end side is the side closer to the antenna 40.

[0065] The front-end switch 20 can selectively conduct the first end and the first selection end, or conduct the first end and the second selection end. In this way, the front-end switch 20 can selectively conduct the N79 receiving path 32 and the N77 / N79 receiving port 12, or conduct the second N77 receiving path 33 and the N77 / N79 receiving port 12.

[0066] The front-end switch 20 includes, but is not limited to, a single-pole double-throw switch, a single-pole multi-throw (SPnT), a double-pole double-throw switch, a multi-pole multi-throw switch, etc. By using a control signal, different frequency band receiving links (such as N77 / N79) are switched to the shared receiving port of the radio frequency transceiver module 10 to achieve dynamic allocation of signal paths.

[0067] This application does not specifically limit the number of N77 receiving ports 11, N77 / N79 receiving ports 12, first N77 receiving paths 31, and N79 receiving paths 32.

[0068] In the first alternative embodiment, please refer to Figure 4 , the number of N77 receiving ports 11 is at least two. The number of N77 / N79 receiving ports 12 is at least two. The number of first N77 receiving paths 31 is at least two. The number of N79 receiving paths 32 is at least two. The number of second N77 receiving paths 33 is at least two. This embodiment can support N77 4RX, or N79 2RX + N77 2RX.

[0069] In the second alternative embodiment, please refer to Figure 5 and Figure 6, the number of the N77 receiving ports 11 is four. The number of the N77 / N79 receiving ports 12 is four. The number of the first N77 receiving paths 31 is four. The number of the N79 receiving paths 32 is four. The number of the second N77 receiving paths 33 is at least two. This embodiment can support N77 4RX + N79 4RX, or N77 6RX, or N77 8RX.

[0070] The following gives examples of the radio frequency system 100 formed by the numbers of different N77 receiving ports 11, N77 / N79 receiving ports 12, first N77 receiving paths 31, and N79 receiving paths 32.

[0071] In the first optional radio frequency system 100, please refer to Figure 4 , the radio frequency transceiver module 10 includes two N77 receiving ports 11 and two N77 / N79 receiving ports 12. The number of the first N77 receiving paths 31 is 2, and the number of the N79 receiving paths 32 is 2. The number of the second N77 receiving paths 33 is 2.

[0072] When the radio frequency system 100 operates in both the N77 and N79 frequency bands simultaneously, the front-end switch 20 switches to conduct the two N77 / N79 receiving ports 12 to the two N79 receiving paths 32 respectively, and the radio frequency system 100 can support N77 2Rx and N79 2Rx simultaneously.

[0073] When the radio frequency system 100 operates in the N77 frequency band, the front-end switch 20 switches to conduct the two N77 / N79 receiving ports 12 to the two second N77 receiving paths 33 respectively, and the radio frequency system 100 can support N77 4Rx, that is, form the N77 4*4MIMO antenna 40.

[0074] It should be noted that the "radio frequency system 100 can support N77 4Rx" described in this application refers to the maximum number of N77 receiving paths. Of course, the radio frequency system 100 can appropriately reduce the number of N77 receiving paths according to requirements. When the received signal strength is strong or the download volume requirement is small, some of the N77 receiving paths can be turned off to reduce power consumption; when the received signal strength is weak (such as in crowded places, elevators, underground garages, subways, tunnels, etc.) or the download volume requirement is large (downloading videos, etc.), the maximum number of N77 receiving paths can be turned on to provide more download channels. The multi-path reception significantly reduces the signal blind area, increases the overall received signal strength, and supports a large download volume requirement. The above process can be automatically detected by the radio frequency system 100, and the number of N77 receiving paths can be dynamically adjusted according to the detection result.

[0075] In the second optional radio frequency system 100, please refer to Figure 5, the radio frequency transceiver module 10 includes 4 N77 receiving ports 11, 2 N77 / N79 receiving ports 12, and 2 N79 receiving ports 13. The number of the first N77 receiving paths 31 is 4, and the number of N79 receiving paths 32 is 4. The number of the second N77 receiving paths 33 is 2.

[0076] When the radio frequency system 100 operates in both the N77 and N79 frequency bands simultaneously, the front-end switch 20 switches to conduct the two N77 / N79 receiving ports 12 to the two N79 receiving paths 32 respectively, and the radio frequency system 100 can support N77 4Rx and N79 4Rx simultaneously.

[0077] When the radio frequency system 100 operates in the N77 frequency band, the front-end switch 20 switches to conduct the two N77 / N79 receiving ports 12 to the two second N77 receiving paths 33 respectively, and the radio frequency system 100 can support N77 6Rx + N79 2Rx.

[0078] The radio frequency system 100 realizes the ability to support N77 4Rx + N79 4Rx simultaneously, or switch to support N77 6Rx + N79 2Rx, only requiring 8 receiving ports to be set.

[0079] In the third optional radio frequency system 100, please refer to Figure 6 , the radio frequency transceiver module 10 includes 4 N77 receiving ports 11 and 4 N77 / N79 receiving ports 12. The number of the first N77 receiving paths 31 is 4, and the number of N79 receiving paths 32 is 4. The number of the second N77 receiving paths 33 is 4.

[0080] When the radio frequency system 100 operates in both the N77 and N79 frequency bands simultaneously, the front-end switch 20 switches to conduct the 4 N77 / N79 receiving ports 12 to the 4 N79 receiving paths 32 respectively, and the radio frequency system 100 can support N77 4Rx and N79 4Rx simultaneously.

[0081] When the radio frequency system 100 operates in both the N77 and N79 frequency bands simultaneously, the front-end switch 20 switches to conduct 2 N77 / N79 receiving ports 12 to 2 N79 receiving paths 32 respectively, and the front-end switch 20 switches to conduct 2 N77 / N79 receiving ports 12 to 2 second N77 receiving paths 33 respectively, and the radio frequency system 100 can support N77 6Rx and N79 2Rx simultaneously.

[0082] When the radio frequency system 100 operates in the N77 frequency band, the front-end switch 20 switches to conduct the 4 N77 / N79 receiving ports 12 to the 4 second N77 receiving paths 33 respectively, and the radio frequency system 100 can support N77 6Rx, or even N77 8Rx.

[0083] The RF system 100 can support N77 4Rx + N79 4Rx simultaneously, support N77 6Rx + N79 2Rx simultaneously, or switch to support N77 8Rx, and only 8 receiving ports need to be set.

[0084] The RF system 100 provided in this application includes an RF transceiver module 10, at least one first N77 receiving path 31, at least one N79 receiving path 32, at least one second N77 receiving path 33, and a front-end switch 20. The RF transceiver module 10 includes at least one N77 receiving port 11 and at least one N77 / N79 receiving port 12. The first N77 receiving path 31 is electrically connected to the N77 receiving port 11, and the first N77 receiving path 31 is used to receive RF signals in the first frequency band. The N79 receiving path 32 is used to receive RF signals in the second frequency band. The second N77 receiving path 33 is used to receive RF signals in the first frequency band. The first end of the front-end switch 20 is electrically connected to the N77 / N79 receiving port 12, the first selection end of the front-end switch 20 is electrically connected to the N79 receiving path 32, and the second selection end of the front-end switch 20 is electrically connected to the second N77 receiving path 33. The front-end switch 20 realizes the multiplexing of the receiving ports of the RF transceiver module 10 for the first frequency band and the second frequency band by switching to conduct the N77 / N79 receiving port 12 and the N79 receiving path 32 or the second N77 receiving path 33, reduces the number of RF ports in the case of supporting more frequency bands, and makes the RF system 100 more miniaturized.

[0085] For the first exemplary receiving path architecture, please refer to Figure 3 , the receiving ports of the RF transceiver module 10 include one N77 receiving port 11 and one N77 / N79 receiving port 12. The receiving paths of the RF front-end module 30 include one first N77 receiving path 31, one N79 receiving path 32, and one second N77 receiving path 33. The RF architecture in this embodiment can support N77 Rx + N79 Rx or N77 2Rx, etc.

[0086] For the second exemplary receiving path architecture, the receiving ports of the RF transceiver module 10 include two N77 receiving ports 11 and one N77 / N79 receiving port 12. The receiving paths of the RF front-end module 30 include two first N77 receiving paths 31, one N79 receiving path 32, and one second N77 receiving path 33. The RF architecture in this embodiment can support N77 2Rx + N79 Rx or N77 3Rx, etc.

[0087] The third exemplary receiving path architecture. The receiving ports of the RF transceiver module 10 include one N77 receiving port 11 and two N77 / N79 receiving ports 12. The receiving paths of the RF front-end module 30 include one first N77 receiving path 31, two N79 receiving paths 32, and two second N77 receiving paths 33. The RF architecture in this embodiment can support N77 Rx+N79 2Rx, N77 2Rx+N79 Rx, or N77 3Rx, etc.

[0088] For the fourth exemplary receiving path architecture, please refer to Figure 4 , the receiving ports of the RF transceiver module 10 include two N77 receiving ports 11 and two N77 / N79 receiving ports 12. The receiving paths of the RF front-end module 30 include two first N77 receiving paths 31, two N79 receiving paths 32, and two second N77 receiving paths 33. The RF architecture in this embodiment can support N77 2Rx+N79 2Rx, N77 3Rx+N79 Rx, or N77 4Rx, etc.

[0089] For the fifth exemplary receiving path architecture, please refer to Figure 5 , the receiving ports of the RF transceiver module 10 include four N77 receiving ports 11 and two N77 / N79 receiving ports 12. The receiving paths of the RF front-end module 30 include four first N77 receiving paths 31, two N79 receiving paths 32, and two second N77 receiving paths 33. The RF architecture in this embodiment can support N77 4Rx+N79 2Rx, N77 5Rx+N79 Rx, or N77 6Rx, etc.

[0090] For the sixth exemplary receiving path architecture, please refer to Figure 6 , the receiving ports of the RF transceiver module 10 include four N77 receiving ports 11 and four N77 / N79 receiving ports 12. The receiving paths of the RF front-end module 30 include four first N77 receiving paths 31, four N79 receiving paths 32, and four second N77 receiving paths 33. The RF architecture in this embodiment can support N77 4Rx+N79 4Rx, N77 5Rx+N79 3Rx, N77 6Rx+N79 2Rx, N77 7Rx+N79 Rx, or N77 8Rx, etc.

[0091] This application does not specifically describe the signals and quantities of the front-end switch 20. The front-end switch 20 only needs to support the switching between the N79 receiving path 32 and the second N77 receiving path 33 in the corresponding embodiments described above. Optionally, the number of ports on the front-end side of all the front-end switches 20 is the same as the number of N77 / N79 receiving ports 12, and the number of ports on the back-end side of all the front-end switches 20 is the sum of the number of N79 receiving paths 32 and the number of second N77 receiving paths 33.

[0092] In the embodiment of this application, through the above design, it is possible to ensure that while supporting more frequency bands, it also supports multiple RXs of the same frequency band, greatly improving the user's downlink rate and bandwidth. For example, downlink 6RX can effectively improve the coverage gain or increase the number of user downlink streams in some scenarios. In this embodiment, by multiplexing the receiving ports of the radio frequency transceiver module 10, the number of downlink channels is increased, that is, the number of radio frequencies and antennas 40 for downlink is increased, so that 4 RXs for N77 downlink (4*4 MIMO technology) and 4 RXs for N79 downlink (4*4 MIMO technology) can be achieved; and the newly added two N77 RXs share the path with the original N79 RX to enter the receiver. On the one hand, it also reduces the number of receiving ports of the radio frequency transceiver module 10, realizes the multiplexing of receiving ports, reduces the miniaturization of components, and reduces the area occupied by components. On the other hand, the radio frequency transceiver module 10 with a relatively small number of original receiving ports can be used, and there is no need to separately set up a radio frequency transceiver module 10 with multiple receiving ports, reducing costs.

[0093] In the receiving path and the transmitting path of the radio frequency front-end module 30 provided in the embodiment of this application, some can be integrated into one chip, or all can be integrated into one chip. For example, the radio frequency front-end module 30 includes a first radio frequency front-end chip. The first radio frequency front-end chip includes two N77 receiving paths, two N79 receiving paths 32, one N77 transmitting path, and one N79 transmitting path. For another example, the radio frequency front-end module 30 includes a second radio frequency front-end chip. The second radio frequency front-end chip includes an N77 receiving path, two N79 receiving paths 32, and one N77 transmitting path. The radio frequency front-end module 30 can separately include the first radio frequency front-end chip; or, separately include the second radio frequency front-end chip; or, include the first radio frequency front-end chip and the second radio frequency front-end chip at the same time.

[0094] The following describes the specific architecture of the radio frequency front-end module 30 with reference to the accompanying drawings.

[0095] In the first optional embodiment, please refer to Figure 7, the first N77 receiving path 31 includes a first N77 LNA module 311 and a first N77 filtering module 312. One end of the first N77 LNA module 311 is electrically connected to the N77 receiving port 11, and the other end of the first N77 LNA module 311 is electrically connected to the first N77 filtering module 312. The first N77 LNA module 311 includes, but is not limited to, a low-noise amplifier for low-noise amplification of the first frequency band. The first N77 filtering module 312 includes, but is not limited to, a filter for filtering clutter to make the first frequency band purer.

[0096] Please refer to Figure 7 , the radio frequency system 100 further includes at least one antenna switch 51 and a plurality of first antennas 41. The selection ends on the front end side of the antenna switch 51 are electrically connected to the first N77 receiving path 31 and the N79 receiving path 32 respectively. The selection ends on the rear end side of the antenna switch 51 are electrically connected to the plurality of first antennas 41 respectively. The first antenna 41 in this embodiment includes a first N77 antenna and an N79 antenna. The first N77 antenna and the N79 antenna can be two independent antennas 40, or can share one antenna 40.

[0097] Please refer to Figure 7 , one end of the first N77 filtering module 312 away from the first N77 LNA module 311 is electrically connected to the first selection end on the front end side of the antenna switch 51, and the rear end side of the antenna switch 51 is electrically connected to a plurality of first N77 antennas. The antenna switch 51 includes, but is not limited to, a double-pole double-throw switch, a multi-pole multi-throw switch, etc. By controlling the signal, different frequency band receiving links (such as the receiving link of N77 / the receiving link of N79) are switched to different first antennas 41 to achieve dynamic allocation of the signal path. Among them, each first antenna 41 can support the N77 frequency band or the N79 frequency band.

[0098] Please refer to Figure 7 , the N79 receiving path 32 further includes an N79 LNA module 321 and an N79 filtering module 322. The N79 LNA module 321 includes, but is not limited to, a low-noise amplifier for low-noise amplification of the second frequency band. The N79 filtering module 322 includes, but is not limited to, a filter for filtering clutter to make the second frequency band purer.

[0099] One end of the N79 LNA module 321 is electrically connected to the first selection end on the rear end side of the front-end switch 20. The other end of the N79 LNA module 321 is electrically connected to the N79 filtering module 322. One end of the N79 filtering module 322 away from the N79 LNA module 321 is electrically connected to the second selection end on the front-end side of the antenna switch 51, and the rear-end side of the antenna switch 51 is electrically connected to a plurality of N79 antennas. For example, the rear-end side of the antenna switch 51 is electrically connected to two N79 antennas, three N79 antennas, or 4 N79 antennas, etc.

[0100] Further optionally, please refer to Figure 7 , the second N77 receiving path 33 includes a second N77 LNA module 331 and a second N77 filtering module 332. The second N77 LNA module 331 includes, but is not limited to, a low-noise amplifier for low-noise amplification of the first frequency band. The second N77 filtering module 332 includes, but is not limited to, a filter for filtering clutter to make the first frequency band cleaner.

[0101] One end of the second N77 LNA module 331 is electrically connected to the second selection end on the rear end side of the front-end switch 20, and the other end of the second N77 LNA module 331 is electrically connected to the second N77 filtering module 332.

[0102] Please refer to Figure 7 , the radio frequency system 100 further includes at least two second antennas 42. Each of the second antennas 42 is electrically connected to one of the second N77 receiving paths 33. The second antenna 42 is also referred to as a second N77 antenna. One end of each of the second N77 filtering modules 332 away from the second N77 LNA module 331 is electrically connected to a second N77 antenna.

[0103] For example, please refer to Figure 8 , the radio frequency front-end module 30 includes a first radio frequency front-end chip 30a.

[0104] Please refer to Figure 8, the first radio frequency front-end chip 30a includes a first first N77 receiving path 31, a second first N77 receiving path 31, a first second N77 receiving path 33, a second second N77 receiving path 33, a first N79 receiving path 32, and a second N79 receiving path 32. Two first N77 LNA modules 311, two first N77 filtering modules 312, two N79 LNA modules 321, two N79 filtering modules 322, and an antenna switch 51 can be integrated in the first radio frequency front-end chip 30a. Further, one first N77 filtering module 312 and one N79 filtering module 322 form a duplexer 323. The input end of the duplexer 323 is electrically connected to a selection end on the front end side of the antenna switch 51, and the two output ends of the duplexer 323 are respectively electrically connected to the first N77 LNA module 311 and the N79 LNA module 321. One first N77 antenna and one first N79 antenna can be integrated into an N77 / N79 antenna. Multiple selection ends on the rear end side of the antenna switch 51 are respectively electrically connected to multiple N77 / N79 antennas. The N77 / N79 antenna can receive both the N77 frequency band and the N79 frequency band.

[0105] Please refer to Figure 8 , the front-end switch 20 includes a first front-end switch 21 and a second front-end switch 22. Among them, the first front-end switch 21 is used to conduct the first N77 / N79 receiving port 12 of the radio frequency transceiver module 10 with the first N79 receiving path 32 or the first second N77 receiving path 33. The second front-end switch 22 is used to conduct the second N77 / N79 receiving port 12 of the radio frequency transceiver module 10 with the second N79 receiving path 32 or the second second N77 receiving path 33. The first second N77 receiving path 33 is electrically connected to a second N77 antenna. The second second N77 receiving path 33 is electrically connected to a second N77 antenna.

[0106] The first front-end switch 21 and the second front-end switch 22 can be provided outside the first radio frequency front-end chip 30a; or integrated in the first radio frequency front-end chip 30a.

[0107] Further, please refer to Figure 9 and Figure 10 , the first radio frequency front-end chip 30a further includes a first N77 transmitting path 61; or a first N77 transmitting path 61 and a first N79 transmitting path 62.

[0108] Optionally, the first second N77 receiving path 33 and the second second N77 receiving path 33 can be integrated into the first radio frequency front-end chip 30a. In this way, the first second N77 receiving path 33 and the second second N77 receiving path 33 can be electrically connected to different selection terminals on the front end side of the antenna switch 51. The selection terminals on the rear end side of the antenna switch 51 are also electrically connected to two N77 antennas 40.

[0109] Optionally, the first second N77 receiving path 33 and the second second N77 receiving path 33 can be located outside the first radio frequency front-end chip 30a.

[0110] Further, please refer to Figure 11 , the radio frequency front-end module 30 further includes a second radio frequency front-end chip 30b.

[0111] The second radio frequency front-end chip 30b includes a third first N77 receiving path 31, a fourth first N77 receiving path 31, a third N79 receiving path 32, and a fourth N79 receiving path 32. Two first N77 LNA modules 311, two first N77 filtering modules 312, two N79 LNA modules 321, two N79 filtering modules 322, and the antenna switch 51 can be integrated in the second radio frequency front-end chip 30b. Further, one first N77 filtering module 312 and one N79 filtering module 322 form a duplexer 323. The input end of the duplexer 323 is electrically connected to a selection terminal on the front end side of the antenna switch 51, and the two output ends of the duplexer 323 are respectively electrically connected to the first N77 LNA module 311 and the N79 LNA module 321. One first N77 antenna and one first N79 antenna can be integrated into an N77 / N79 antenna. The multiple selection terminals on the rear end side of the antenna switch 51 are respectively electrically connected to multiple N77 / N79 antennas.

[0112] In this embodiment, the number of the antenna switches 51 is two. The number of the first antennas 41 is four. The number of the second antennas 42 is two. The radio frequency system 100 can form six receiving paths in the first frequency band.

[0113] Further, please refer to Figure 11 , the radio frequency system 100 further includes a third second N77 receiving path 33 and a fourth second N77 receiving path 33.

[0114] The front-end switch 20 includes a third front-end switch 20 and a fourth front-end switch 20. Among them, the third front-end switch 20 is used to connect the third N77 / N79 receiving port 12 of the radio frequency transceiver module 10 to the third N79 receiving path 32 or the third second N77 receiving path 33. The fourth front-end switch 20 is used to connect the fourth N77 / N79 receiving port 12 of the radio frequency transceiver module 10 to the fourth N79 receiving path 32 or the fourth second N77 receiving path 33. The third second N77 receiving path 33 is electrically connected to a second N77 antenna. The fourth second N77 receiving path 33 is electrically connected to a second N77 antenna.

[0115] In this embodiment, the number of the antenna switches 51 is two. The number of the first antennas 41 is 4. The number of the second antennas 42 is 4. The radio frequency system 100 can form 8 receiving paths in the first frequency band.

[0116] The third front-end switch 20 and the fourth front-end switch 20 can be arranged outside the second radio frequency front-end chip 30b; or integrated in the second radio frequency front-end chip 30b.

[0117] Optionally, the third second N77 receiving path 33 and the fourth second N77 receiving path 33 can be integrated in the second radio frequency front-end chip 30b or located outside the second radio frequency front-end chip 30b.

[0118] Further, please refer to Figure 11 , the second radio frequency front-end chip 30b further includes a second N77 transmitting path 61; or a second N77 transmitting path 61 and a second N79 transmitting path 62.

[0119] In this way, the radio frequency system 100 can support N77 Tx, or N77 Tx + N79 Tx, or N77 2Tx, or N77 2Tx + N79 2Tx.

[0120] The RF system 100 provided by this embodiment is designed such that the RF transceiver module 10 has N77 / N79 receiving ports 12 capable of simultaneously receiving the first frequency band and the second frequency band. Further, the front-end switch 20 is designed to switch the N77 / N79 receiving ports 12 to be conducted with the second N77 receiving path 33 or the N79 receiving path 32, thereby enabling N77 and N79 to share the same receiving port in the RF transceiver module 10. When there are two first N77 receiving paths 31, two N79 receiving paths 32, and two second N77 receiving paths 33 in the RF system 100, the RF transceiver module 10 only needs to provide 4 receiving ports to implement the N77 4Rx path or the N77 2Rx + N79 2Rx path. When there are four first N77 receiving paths 31, four N79 receiving paths 32, and four second N77 receiving paths 33 in the RF system 100, the RF transceiver module 10 only needs to provide 8 receiving ports to implement the N77 8Rx path or the N77 4Rx + N79 4Rx path.

[0121] In the second alternative embodiment, please refer to Figure 12 , the architecture of the RF system 100 provided by this embodiment is substantially the same as that of the first alternative embodiment. The main difference is that the RF system 100 further includes at least one N77 / N79 LNA module 341. The operating frequency of the N77 / N79 LNA module 341 covers the first frequency band and the second frequency band. The N77 / N79 LNA module 341 can perform low-noise amplification on the first frequency band and the second frequency band. The N77 / N79 LNA module 341 can replace the N79 LNA module 321 in the first alternative embodiment.

[0122] The structure of the first N77 receiving path 31 in this embodiment is the same as that of the first N77 receiving path 31 in the first alternative embodiment.

[0123] One end of the N77 / N79 LNA module 341 is electrically connected to the N77 / N79 receiving port 12, and the other end of the N77 / N79 LNA module 341 is electrically connected to the first end on the front-end side of the front-end switch 20. The first selection end on the rear-end side of the front-end switch 20 is electrically connected to the N79 filtering module 322. One end of the N79 filtering module 322 far from the N79 LNA module 321 is electrically connected to the second selection end on the front-end side of the antenna switch 51, and the rear-end side of the antenna switch 51 is electrically connected to multiple N79 antennas.

[0124] Further optionally, the second N77 receiving path 33 further includes a second N77 filtering module 332. The second N77 filtering module 332 is electrically connected to the second selection end on the rear end side of the front-end switch 20. One side of the second N77 filtering module 332 away from the second selection end on the rear end side of the front-end switch 20 is also electrically connected to a second N77 antenna.

[0125] In this embodiment, by designing that the radio frequency transceiver module 10 includes N77 / N79 receiving ports 12, and further designing that the radio frequency front-end module 30 includes an N77 / N79 LNA module 341 electrically connected to the N77 / N79 receiving ports 12, the front-end switch 20 is used to switch the N77 / N79 LNA module 341 to be electrically connected to the N79 filtering module 322 and the N79 antenna, or to switch the N77 / N79 LNA module 341 to be electrically connected to the second N77 filtering module 332 and the second N77 antenna, so as to realize the switching between the N79 receiving link and the N77 receiving link. At the same time, the N79 receiving link and the N77 receiving link also share the LNA module and the receiving ports of the radio frequency transceiver module 10. Compared with the first embodiment, in which two LNA modules (an N79 LNA module and a second N77 LNA module 331) need to be provided, only one LNA module (an N77 / N79 LNA module 341) needs to be provided in this embodiment, further reducing the number of components and the distribution area of the components, improving the reuse rate of the components, and reducing the cost.

[0126] For example, the radio frequency front-end module 30 includes a first radio frequency front-end chip 30a.

[0127] Please refer to Figure 12 , the first radio frequency front-end chip 30a includes a first first N77 receiving path 31, a second first N77 receiving path 31, a first second N77 receiving path 33, a second second N77 receiving path 33, a first N79 receiving path 32, and a second N79 receiving path 32. Two first N77 LNA modules 311, two first N77 filtering modules 312, two N77 / N79 LNA modules 341, two N79 filtering modules 322, and an antenna switch 51 can be integrated in the first radio frequency front-end chip 30a. Further, one first N77 filtering module 312 and one N79 filtering module 322 form a duplexer 323. The input end of the duplexer 323 is electrically connected to a selection end on the front-end side of the antenna switch 51. One first N77 antenna and one first N79 antenna can be integrated into an N77 / N79 antenna. Multiple selection ends on the rear-end side of the antenna switch 51 are respectively electrically connected to multiple N77 / N79 antennas. The N77 / N79 antenna can receive both the N77 frequency band and the N79 frequency band. The number of duplexers 323 in the first radio frequency front-end chip 30a is two, namely a first duplexer 323a and a second duplexer 323b.

[0128] Please refer to Figure 12 As shown in the figure, the front-end switch 20 includes a first front-end switch 21 and a second front-end switch 22. Two output terminals of the first duplexer 323a are respectively electrically connected to the first selection terminal on the rear-end side of the first N77 LNA module 311 and the first front-end switch 21. The second selection terminal on the rear-end side of the first front-end switch 21 is electrically connected to the first second N77 receiving path 33 and a second N77 antenna. The first terminal on the front-end side of the first front-end switch 21 is electrically connected to the N77 / N79 LNA module 341. Two output terminals of the second duplexer 323b are respectively electrically connected to the first selection terminal on the rear-end side of the first N77 LNA module 311 and the second front-end switch 22. The second selection terminal on the rear-end side of the second front-end switch 22 is electrically connected to the second second N77 receiving path 33 and a second N77 antenna. The first terminal on the front-end side of the second front-end switch 22 is electrically connected to the N77 / N79 LNA module 341.

[0129] In this embodiment, the second N77 filtering module 332 is located outside the first radio frequency front-end chip 30a.

[0130] For example, please refer to Figure 12 As shown in the figure, the radio frequency front-end module 30 further includes a second radio frequency front-end chip 30b.

[0131] In an alternative embodiment, the second radio frequency front-end chip 30b may include a third first N77 receiving path 31, a fourth first N77 receiving path 31, a third N79 receiving path 32, and a fourth N79 receiving path 32. Two first N77 LNA modules 311, two first N77 filtering modules 312, two N79 LNA modules 321, two N79 filtering modules 322, and an antenna switch 51 may be integrated in the second radio frequency front-end chip 30b. Further, one first N77 filtering module 312 and one N79 filtering module 322 form a duplexer 323. The input terminal of the duplexer 323 is electrically connected to one selection terminal on the front-end side of the antenna switch 51. Two output terminals of the duplexer 323 are respectively electrically connected to the first N77 LNA module 311 and the N79 LNA module 321. One first N77 antenna and one first N79 antenna may be integrated into an N77 / N79 antenna. Multiple selection terminals on the rear-end side of the antenna switch 51 are respectively electrically connected to multiple N77 / N79 antennas.

[0132] In this embodiment, the two second N77 receiving paths 33 in the radio frequency front-end module 30 may share the receiving ports and LNA modules with the two N79 receiving paths 32.

[0133] In another alternative embodiment, the structure of the second radio frequency front-end chip 30b is the same as that of the first radio frequency front-end chip 30a.

[0134] In this embodiment, the four second N77 receiving paths 33 in the RF front-end module 30 can share the receiving ports and LNA modules with the four N79 receiving paths 32.

[0135] In this embodiment, the second N77 filtering module 332 is located outside the first RF front-end chip 30a.

[0136] It should be noted that when the number of the second N77 receiving paths 33 is two, one second N77 receiving path 33 can be electrically connected to the front-end switch 20 in the first RF front-end chip 30a (or electrically connected to the front-end switch 20 that is electrically connected to the first RF front-end chip 30a), and the other second N77 receiving path 33 can be electrically connected to the front-end switch 20 in the second RF front-end chip 30b (or electrically connected to the front-end switch 20 that is electrically connected to the second RF front-end chip 30b).

[0137] In the third alternative embodiment, please refer to Figure 13 , the architecture of the RF system 100 provided in this embodiment is substantially the same as that of the second alternative embodiment. The main difference is that when the first RF front-end chip 30a includes a front-end switch 21 electrically connected to the second N77 filtering module 332, the second N77 filtering module 332 can be integrated into the first RF front-end chip 30a. Further optionally, when the second RF front-end chip 30b includes a front-end switch 22 electrically connected to the second N77 filtering module 332, the second N77 filtering module 332 can be integrated into the second RF front-end chip 30b.

[0138] In other words, the second N77 filtering module 332, the first N77 LNA module 311, the first N77 filtering module 312, the N79 LNA module 321, the N79 filtering module 322, and the N77 / N79 LNA module 341 are integrated in one chip. In this embodiment, by integrating the second N77 filtering module 332 into the RF front-end chip, the integration degree of the RF front-end chip is improved. Compared with the embodiment in which the second N77 filtering module 332 is provided outside the RF front-end chip, this embodiment can further reduce the area occupied by the separate arrangement of devices, and further promote integration and miniaturization.

[0139] It should be noted that the aforementioned first RF front-end chip 30a and second RF front-end chip 30b can be integrated into one chip; each module in the aforementioned first RF front-end chip 30a and second RF front-end chip 30b can also be separately integrated into 3 or more chips.

[0140] In other embodiments, please refer to Figure 14When the first radio frequency front-end chip 30a includes the front-end switches 21 and 22, the second N77 filtering module 332 electrically connected to the front-end switch 21 can be integrated into the first radio frequency front-end chip 30a. The second N77 filtering module 332 electrically connected to the front-end switch 22 can be integrated into the first radio frequency front-end chip 30a.

[0141] In the fourth alternative embodiment, based on the first alternative embodiment, please refer to Figure 9 , the radio frequency transceiver module 10 further includes at least one N77 transmission port 14.

[0142] The radio frequency system 100 includes at least one N77 transmission path 61. The N77 transmission path 61 is used to transmit the radio frequency signal of the first frequency band. The N77 transmission path 61 includes an N77 power amplification module 611 and a first N77 transceiver switch 612. The two selection ends on the front-end side of the first N77 transceiver switch 612 are electrically connected to the first N77 LNA module 311 and the N77 power amplification module 611 respectively. The back-end side of the first N77 transceiver switch 612 is electrically connected to the first N77 filtering module 312.

[0143] The radio frequency system 100 provided in this embodiment can support N77 Tx and N77 nRx, where n is 1, 2, 3, 4, 5, 6, 7, 8, etc.

[0144] In the fifth alternative embodiment, based on the fourth alternative embodiment, please refer to Figure 10 , the radio frequency transceiver module 10 further includes at least one N79 transmission port 15.

[0145] The radio frequency system 100 includes at least one N79 transmission path 62. The N79 transmission path 62 is used to transmit the radio frequency signal of the second frequency band. The N79 transmission path 62 includes an N79 power amplification module 621 and an N79 transceiver switch 622. The two selection ends on the front-end side of the N79 transceiver switch 622 are electrically connected to the N79 LNA module 321 and the N79 power amplification module 621 respectively. The back-end side of the N79 transceiver switch 622 is electrically connected to the N79 filtering module 322.

[0146] The radio frequency system 100 provided in this embodiment can support N77 Tx and N77 nRx, and the radio frequency system 100 can also support N79 Tx and N79 mRx. n is 1, 2, 3, 4, 5, 6, 7, 8, etc. m is 1, 2, 3, 4, etc.

[0147] Further optionally, please refer to Figure 11, the first RF front-end chip 30a includes a first N77 transmission path 61, and the second RF front-end chip 30b includes an N79 transmission path 62 and a second N77 transmission path 61. Thus, the RF system 100 provided in this embodiment can support N77 Tx, or N77 2Tx or N79 Tx.

[0148] In the sixth alternative embodiment, based on the second alternative embodiment, please refer to Figure 12 , the RF transceiver module 10 further includes a first N77 transmission port 14, and the first RF front-end chip 30a further includes a first N77 transmission path 61. The first N77 transmission path 61 and a first N77 reception path 31 are switchably electrically connected to a first N77 filtering module 312 through a first N77 transceiver switch 612.

[0149] Further optionally, the RF transceiver module 10 further includes a second N77 transmission port 16 and an N79 transmission port 15, and the second RF front-end chip 30b further includes a second N77 transmission path 61 and an N79 transmission path 62. The second N77 transmission path 61 and a first N77 reception path 31 are switchably electrically connected to a first N77 filtering module 312 through a first N77 transceiver switch 612. The N79 transmission path 62 and an N79 reception path 32 are switchably electrically connected to an N79 filtering module 322 through an N79 transceiver switch 622.

[0150] In the seventh alternative embodiment, different from the sixth alternative embodiment, please refer to Figure 15 and Figure 16 , the N79 transceiver switch 622 is used as the front-end switch 20, and a second N77 filtering module 332 is electrically connected to the selection end on the rear-end side of the front-end switch 20.

[0151] Specifically, the RF transceiver module 10 further includes at least one N79 transmission port 15.

[0152] The RF system 100 includes at least one N79 transmission path 62. The N79 transmission path 62 is used for transmitting the RF signal of the second frequency band. The N79 transmission path 62 includes an N79 power amplification module 621. The two selection ends on the front-end side of the front-end switch 20 are respectively electrically connected to the N77 / N79 LNA module 341 and the N79 power amplification module 621. The two selection ends on the rear-end side of the front-end switch 20 are respectively electrically connected to the N79 filtering module 322 and the second N77 filtering module 332.

[0153] For example, in the sixth alternative embodiment, the second N77 filtering module 332 and the second N77 antenna of the front-end switch 20 electrically connected to the first radio frequency front-end chip 30a are moved to an optional end on the back-end side of the N79 transceiver switch 622 of the second radio frequency front-end chip 30b.

[0154] For ease of description, in the embodiments of the present application, the first frequency band is taken as the N77 frequency band and the second frequency band is taken as the N79 frequency band as an example. The N77 receiving port 11 may also be referred to as the first receiving port; the N77 / N79 receiving port 12 may also be referred to as the second receiving port; the first N77 receiving path 31 may also be referred to as the first receiving path; the N79 receiving path 32 may also be referred to as the second receiving path; the second N77 receiving path 33 may also be referred to as the third receiving path; the first N77 LNA module 311 may also be referred to as the first LNA module; the first N77 filtering module 312 may also be referred to as the first filtering module; the N79 LNA module 321 may also be referred to as the second LNA module; the N79 filtering module 322 may also be referred to as the second filtering module; the second N77 LNA module 331 may also be referred to as the third LNA module; the second N77 filtering module 332 may also be referred to as the third filtering module; the N77 / N79 LNA module 341 may also be referred to as the fourth LNA module; the N77 transmitting port 14 may also be referred to as the first transmitting port; the N77 transmitting path 61 may also be referred to as the first transmitting path; the N77 power amplification module 611 may also be referred to as the first power amplification module; the first N77 transceiver switch 612 may also be referred to as the first transceiver switch; the N79 transmitting port 15 may also be referred to as the second transmitting port; the N79 transmitting path 62 may also be referred to as the second transmitting path; the N79 power amplification module 621 may also be referred to as the second power amplification module; the N79 transceiver switch 622 may also be referred to as the second transceiver switch.

[0155] In other embodiments, the first frequency band is the N79 frequency band, and the second frequency band is the N77 frequency band. The corresponding device names can also be changed. For example, the N77 receiving port 11 can also be replaced by the N79 receiving port; the first N77 receiving path 31 can also be replaced by the first N79 receiving path; the N79 receiving path 32 can also be replaced by the N77 receiving path; the second N77 receiving path 33 can also be replaced by the second N79 receiving path; the first N77 LNA module 311 can also be replaced by the first N79 LNA module; the first N77 filtering module 312 can also be replaced by the first N79 filtering module; the N79 LNA module 321 can also be replaced by the N77 LNA module; the N79 filtering module 322 can also be replaced by the N77 filtering module; the second N77 LNA module 331 can also be replaced by the second N79 LNA module; the second N77 filtering module 332 can also be replaced by the second N79 filtering module; the N77 transmitting port 14 can also be replaced by the N79 transmitting port; the N77 transmitting path 61 can also be replaced by the N79 transmitting path; the N77 power amplification module 611 can also be replaced by the N79 power amplification module; the first N77 transceiver switch 612 can also be replaced by the first N79 transceiver switch; the N79 transmitting port 15 can also be replaced by the N77 transmitting port; the N79 transmitting path 62 can also be replaced by the N77 transmitting path; the N79 power amplification module 621 can also be replaced by the N77 power amplification module; the N79 transceiver switch 622 can also be replaced by the N77 transceiver switch.

[0156] The above are examples of some transmitting paths. The present application also provides the following transmitting path architectures.

[0157] For the first exemplary transmitting path architecture, please refer to Figure 9 , the transmitting port of the radio frequency transceiver module 10 includes an N77 transmitting port 14. The receiving path of the radio frequency front-end module 30 includes an N77 transmitting path 61. The radio frequency architecture in this embodiment can support the transmission of N77.

[0158] For the second exemplary transmitting path architecture, please refer to Figure 10 , the transmitting port of the radio frequency transceiver module 10 includes an N77 transmitting port 14 and an N79 transmitting port 15. The receiving path of the radio frequency front-end module 30 includes an N77 transmitting path 61 and an N79 transmitting path 62. The radio frequency architecture in this embodiment can support the transmission of N77 and N79.

[0159] For the third exemplary transmitting path architecture, the transmitting port of the radio frequency transceiver module 10 includes two N77 transmitting ports 14. The receiving path of the radio frequency front-end module 30 includes two N77 transmitting paths 61. The radio frequency architecture in this embodiment can support N77 2Tx, etc.

[0160] The fourth exemplary transmit path architecture. The transmit ports of the RF transceiver module 10 include two N79 transmit ports 15. The receive path of the RF front-end module 30 includes two N79 transmit paths 62. The RF architecture in this embodiment can support N79 2Tx and so on.

[0161] For the fifth exemplary transmit path architecture, please refer to Figure 11 , the transmit ports of the RF transceiver module 10 include 2 N77 transmit ports 14 and 1 N79 transmit port 15. The receive path of the RF front-end module 30 includes two N77 transmit paths 61 and one N79 transmit path 62. The RF architecture in this embodiment can support N79 Tx, N77 2Tx and so on.

[0162] For the sixth exemplary transmit path architecture, the transmit ports of the RF transceiver module 10 include 2 N79 transmit ports 15 and 1 N77 transmit port 14. The receive path of the RF front-end module 30 includes two N79 transmit paths 62 and 1 N77 transmit path 61. The RF architecture in this embodiment can support N77 Tx, N79 2Tx and so on.

[0163] For the seventh exemplary transmit path architecture, the transmit ports of the RF transceiver module 10 include 2 N77 transmit ports 14 and 2 N79 transmit ports 15. The receive path of the RF front-end module 30 includes two N77 transmit paths 61 and 2 N79 transmit paths 62. The RF architecture in this embodiment can support N77 2Tx, N79 2Tx and so on.

[0164] Any one of the transmit path architectures provided by this application can be combined with any one of the receive path architectures provided by this application to form the RF front-end module 30.

[0165] The above are only several embodiments obtained according to the inventive concept of this application. Embodiments derived by those skilled in the art based on the inventive concept of this application are also within the protection scope of this application. For example, the number of transmit ports can also be extended to more than 3, and the number of transmit paths can be extended to more than 3. For example, the number of receive ports can also be extended to more than 8, and the number of transmit paths can be extended to more than 8.

[0166] The RF transceiver module 10 further includes a control module.

[0167] Optionally, the control module is configured to control the front-end switch 20 to turn on the second N77 receive path 33 and the N77 / N79 receive port 12 when the received signal strength in the first frequency band is less than the first threshold.

[0168] This application does not specifically limit the first threshold. In the case where the received signal strength is weak (such as in scenarios like crowded places, elevators, underground garages, subways, tunnels, etc.), the front-end switch 20 is controlled to conduct the second N77 receiving path 33 and the N77 / N79 receiving port 12, enabling more N77 receiving paths to be opened to provide more download channels. The multi-path reception significantly reduces the signal blind area, increases the overall received signal strength, and supports a larger download volume requirement. The above process can be automatically detected by the radio frequency system 100, and the number of N77 receiving paths can be dynamically adjusted according to the detection result.

[0169] Optionally, the control module is configured to control the front-end switch 20 to conduct the second N77 receiving path 33 and the N77 / N79 receiving port 12 when the downlink traffic demand in the first frequency band is greater than or equal to the second threshold.

[0170] This application does not specifically limit the second threshold. In the case where the download volume requirement is large (such as downloading videos, etc.), more N77 receiving paths can be opened to provide more download channels. The multi-path reception significantly reduces the signal blind area, increases the overall received signal strength, and supports a larger download volume requirement. The above process can be automatically detected by the radio frequency system 100, and the number of N77 receiving paths can be dynamically adjusted according to the detection result.

[0171] Please refer to Figure 17 , Embodiment 3 of this application provides a radio frequency front-end module 30. The radio frequency front-end module 30 includes at least one first N77 LNA module 311, at least one N77 / N79 LNA module 341, at least one first N77 filtering module 312, at least one N79 filtering module 322, and at least one front-end switch 20.

[0172] One end of the first N77 LNA module 311 is used for electrically connecting to the N77 receiving port 11 of the radio frequency transceiver module 10.

[0173] One end of the N77 / N79 LNA module 341 is used for electrically connecting to the N77 / N79 receiving port 12 of the radio frequency transceiver module 10.

[0174] The first N77 filtering module 312 is electrically connected to the other end of the first N77 LNA module 311. The first N77 filtering module 312 is used for electrically connecting to the first antenna 41.

[0175] The other end of the first N77 LNA module 311 is electrically connected to the first selection end on the front-end side of the front end. The first selection end on the rear-end side of the front-end switch 20 is electrically connected to one end of the N79 filtering module 322, and the other end of the N79 filtering module 322 is used to be electrically connected to the first antenna 41. The first antenna 41 includes a first N77 antenna and an N79 antenna. The first N77 antenna and the N79 antenna can be two independent antennas 40, or can share one antenna 40. In this embodiment, the first antenna 41 is an N77 / N79 antenna.

[0176] The second selection end on the rear-end side of the front-end switch 20 is used to be electrically connected to the second antenna 42. The second antenna 42 is a second N77 antenna.

[0177] For example, the radio frequency front-end module 30 includes a first radio frequency front-end chip 30a. The first radio frequency front-end chip 30a includes 2 first N77 LNA modules 311, 2 N77 / N79 LNA modules 341, 2 first N77 filtering modules 312, 2 N79 filtering modules 322 and 2 front-end switches 20. One first N77 filtering module 312 and one N79 filtering module 322 form a duplexer 323.

[0178] The radio frequency front-end module 30 provided in this application includes at least one first N77 LNA module 311, at least one N77 / N79 LNA module 341, at least one first N77 filtering module 312, at least one N79 filtering module 322 and at least one front-end switch 20. One end of the first N77 LNA module 311 is used to be electrically connected to the N77 receiving port 11 of the radio frequency transceiver module 10; one end of the N77 / N79 LNA module 341 is used to be electrically connected to the N77 / N79 receiving port 12 of the radio frequency transceiver module 10. The first N77 filtering module 312 is electrically connected to the other end of the first N77 LNA module 311, and the first N77 filtering module 312 is used to be electrically connected to the first antenna 41; the other end of the first N77 LNA module 311 is electrically connected to the first selection end on one side of the front-end switch 20, and the first selection end on the other side of the front-end switch 20 is electrically connected to one end of the N79 filtering module 322. The other end of the N79 filtering module 322 is used to be electrically connected to the first antenna 41, and the second selection end on the rear-end side of the front-end switch 20 is used to be electrically connected to the second antenna 42; the front-end switch 20 realizes that the signals received by the first antenna 41 and the second antenna 42 can share the first N77 LNA module 311 by switching to conduct the first N77 LNA module 311 and the first antenna 41 or the second antenna 42, reducing the number of LNAs in the case of supporting more frequency bands and making the radio frequency system 100 more miniaturized.

[0179] The radio frequency front-end module 30 further includes at least one second N77 filtering module 332. One end of the second N77 filtering module 332 is electrically connected to the second selection end on the other side of the front-end switch 20. The other end of the second N77 filtering module 332 is used to be electrically connected to the second antenna 42.

[0180] In the first optional first radio frequency front-end chip 30a, please refer to Figure 17 , the number of front-end switches 20 is two, and each front-end switch 20 is used to switch one N77 / N79 LNA module 341 with one N79 filtering module 322 or one second N77 filtering module 332. In this embodiment, two second N77 receiving paths 33 and N79 receiving paths 32 can share the N77 / N79 LNA module 341.

[0181] Further optionally, please refer to Figure 17 , the first radio frequency front-end chip 30a further includes a first N77 transmitting path 61 and a first N77 transceiver switch 612. The first N77 transmitting path 61 includes an N77 power amplifier module 611. One end of the N77 power amplifier module 611 is used to be electrically connected to the N77 transmitting port 14 of the radio frequency transceiver module 10. The other end of the N77 power amplifier module 611 is electrically connected to the first selection end of the first N77 transceiver switch 612. The second selection end of the first N77 transceiver switch 612 is electrically connected to the other end of the first N77 LNA module 311, and the rear end side of the first N77 transceiver switch 612 is electrically connected to the first N77 filtering module 312.

[0182] Further optionally, please refer to Figure 17 , the first radio frequency front-end chip 30a further includes an antenna switch 51. Multiple selection ends on the front end side of the antenna switch 51 are respectively electrically connected to the output ends of the duplexer 323. Multiple selection ends on the rear end side of the antenna switch 51 are respectively electrically connected to multiple first antennas 41.

[0183] Further optionally, please refer to Figure 17 , the first radio frequency front-end chip 30a further includes a coupling module 52. The coupling module 52 is arranged between the duplexer 323 and the antenna switch 51, and the coupling module 52 obtains the power on the N77 transmitting path, the power on the N79 receiving path, the power on the N77 receiving path, etc. through coupling.

[0184] Please refer to Figure 17, the first radio frequency front-end chip 30a further includes a first resistor 53, a second resistor 54, a switch module 55, etc. The first resistor 53, the coupling module 52, the second resistor 54, and the switch module 55 are electrically connected in sequence. The switch module 55 is used to connect or disconnect the coupling module 52 from the output port of the first radio frequency front-end chip 30a. Optionally, the first resistor 53 is a 50-ohm resistor. Optionally, the second resistor 54 is a 50-ohm resistor.

[0185] In the second optional first radio frequency front-end chip 30a, please refer to Figure 18 and Figure 19 , different from the first optional first radio frequency front-end chip 30a, it has one less front-end switch 20 than the first radio frequency front-end chip 30a. This embodiment can implement multiplexing of one second N77 receiving path 33 and the N79 receiving path 32 for the N77 / N79 LNA module 341.

[0186] In the third optional first radio frequency front-end chip 30a, different from the second optional first radio frequency front-end chip 30a, please refer to Figure 20 and Figure 21 , the radio frequency front-end module 30 further includes at least one N79 power amplification module 621. One end of the N79 power amplification module 621 is used to be electrically connected to the N79 transmitting port 15 of the radio frequency front-end module 30, and the other end of the N79 power amplification module 621 is electrically connected to the second selection end on the front-end side of the front-end switch 20. This embodiment can implement multiplexing of one second N77 receiving path 33 and the N79 receiving path 32 for the N77 / N79 LNA module 341, as well as alternative transmission or dual transmission of N77 and N79.

[0187] Further optionally, in the foregoing first optional first radio frequency front-end chip 30a to the third optional first radio frequency front-end chip 30a, the second N77 filtering module 332 can be integrated in the first radio frequency front-end chip 30a.

[0188] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application, and these improvements and refinements are also regarded as the protection scope of the present application.

Claims

1. A radio frequency system, characterized in that: include: A radio frequency transceiver module, comprising at least one first receiving port and at least one second receiving port; at least one first receiving path, the first receiving path being electrically connected to the first receiving port, and the first receiving path being used to receive a radio frequency signal in a first frequency band; at least one second receiving path, the second receiving path being used to receive a radio frequency signal in a second frequency band; at least one third receiving path, the third receiving path being used to receive radio frequency signals in the first frequency band; and A front-end switch, wherein a first end of the front-end switch is electrically connected to the second receiving port, a first selection end of the rear-end switch is electrically connected to the second receiving path, and a second selection end of the rear-end switch is electrically connected to the third receiving path.

2. The radio frequency system according to claim 1, characterized in that The first receiving path includes a first LNA module and a first filtering module, one end of the first LNA module is electrically connected to the first receiving port, and the other end of the first LNA module is electrically connected to the first filtering module; The second receiving path further includes a second LNA module and a second filtering module. One end of the second LNA module is electrically connected to the first selection end of the front-end switch, and the other end of the second LNA module is electrically connected to the second filtering module.

3. The radio frequency system according to claim 2, characterized in that: The third receiving path includes a third LNA module and a third filtering module. One end of the third LNA module is electrically connected to the second selection end of the front-end switch, and the other end of the third LNA module is electrically connected to the third filtering module.

4. The radio frequency system according to claim 2, characterized in that: The radio frequency system further includes at least one fourth LNA module, and the operating frequency of the fourth LNA module covers the first frequency band and the second frequency band; One end of the fourth LNA module is electrically connected to the second receiving port, and the other end of the fourth LNA module is electrically connected to the first end of the front end side of the front end switch.

5. The radio frequency system according to claim 4, characterized in that: The third receiving path further includes a third filtering module, and the third filtering module is electrically connected to the second selection end of the front-end switch.

6. The radio frequency system according to claim 5, characterized in that: The third filtering module, the first LNA module, the first filtering module, the second LNA module, the second filtering module, and the fourth LNA module are integrated into one chip.

7. The radio frequency system according to claim 4, characterized in that: The first filter module and the second filter module form a duplexer.

8. The radio frequency system according to any one of claims 1 to 7, characterized in that: The number of the first receiving ports is at least two, the number of the second receiving ports is at least two, the number of the first receiving paths is at least two, the number of the second receiving paths is at least two, and the number of the third receiving paths is at least two.

9. The radio frequency system according to any one of claims 1 to 7, characterized in that: The number of the first receiving ports is four, the number of the second receiving ports is four, the number of the first receiving paths is four, the number of the second receiving paths is four, and the number of the third receiving paths is at least two.

10. The radio frequency system according to claim 9, characterized in that: The radio frequency system further includes at least one antenna switch and a plurality of first antennas, wherein the selection end of the front end side of the antenna switch is electrically connected to the first receiving path and the second receiving path respectively, and the selection end of the rear end side of the antenna switch is electrically connected to the plurality of first antennas respectively; The radio frequency system further includes at least two second antennas, each of which is electrically connected to one of the third receiving paths.

11. The radio frequency system according to claim 10, characterized in that: The number of the antenna switches is two, the number of the first antennas is four, the number of the second antennas is two, and the radio frequency system can form six receiving paths of the first frequency band; or, The number of the antenna switches is two, the number of the first antennas is four, the number of the second antennas is four, and the radio frequency system can form eight receiving paths of the first frequency band.

12. The radio frequency system according to claim 2, characterized in that: The radio frequency transceiver module also includes at least one first transmitting port; The radio frequency system includes at least one first transmitting path, the first transmitting path is used to transmit the radio frequency signal of the first frequency band, the first transmitting path includes a first power amplifier module and a first transceiver switch, two selection ends on the front end side of the first transceiver switch are electrically connected to the first LNA module and the first power amplifier module respectively, and the rear end side of the first transceiver switch is electrically connected to the first filter module.

13. The radio frequency system according to claim 2, characterized in that: The radio frequency transceiver module also includes at least one second transmitting port; The radio frequency system includes at least one second transmitting path, the second transmitting path is used to transmit the radio frequency signal of the second frequency band, the second transmitting path includes a second power amplifier module and a second transceiver switch, two selection ends on the front end side of the second transceiver switch are electrically connected to the second LNA module and the second power amplifier module respectively, and the rear end side of the second transceiver switch is electrically connected to the second filtering module.

14. The radio frequency system according to claim 4, characterized in that: The radio frequency transceiver module also includes at least one second transmitting port; The radio frequency system includes at least one second transmitting path, the second transmitting path is used to transmit the radio frequency signal of the second frequency band, the second transmitting path includes a second power amplifier module, the two selection ends on the front end side of the front end switch are respectively electrically connected to the fourth LNA module and the second power amplifier module, and the two selection ends on the rear end side of the front end switch are respectively electrically connected to the second filter module and the third filter module.

15. The radio frequency system according to any one of claims 1 to 7 and 10 to 14, characterized in that: The first frequency band includes the N77 frequency band, and the second frequency band includes the N79 frequency band; or, the first frequency band includes the N79 frequency band, and the second frequency band includes the N77 frequency band.

16. The radio frequency system according to claim 1, characterized in that: The RF transceiver module further includes a control module, and the control module is used to control the front-end switch to conduct the third receiving path and the second receiving port when the received signal strength of the first frequency band is less than a first threshold; and / or, The control module is used for controlling the front-end switch to conduct the third receiving path and the second receiving port when the downlink traffic demand of the first frequency band is greater than or equal to a second threshold.

17. A radio frequency front-end module, characterized in that: include: At least one first LNA module, one end of the first LNA module is used to electrically connect to the first receiving port of the RF transceiver module; at least one fourth LNA module, one end of the fourth LNA module is used to electrically connect to the second receiving port of the RF transceiver module, at least one first filtering module, the first filtering module being electrically connected to the other end of the first LNA module, the first filtering module being used to be electrically connected to a first antenna; at least one second filtering module, At least one front-end switch, the other end of the first LNA module is electrically connected to the first selection end on the front end side of the front-end switch, the first selection end on the rear end side of the front-end switch is electrically connected to one end of the second filter module, and the other end of the second filter module is used to electrically connect to the first antenna; the second selection end on the rear end side of the front-end switch is used to electrically connect to the second antenna.

18. The radio frequency front-end module according to claim 17, characterized in that: The RF front-end module also includes at least one first power amplifier module and at least one first transceiver switch, one end of the first power amplifier module is used to electrically connect to the first transmitting port of the RF transceiver module; the other end of the first power amplifier module is electrically connected to the first selection end of the first transceiver switch, the second selection end of the first transceiver switch is electrically connected to the other end of the first LNA module, and the rear end side of the first transceiver switch is electrically connected to the first filtering module.

19. The radio frequency front-end module according to claim 18, characterized in that: The RF front-end module also includes at least one second power amplifier module, one end of the second power amplifier module is used to electrically connect to the second transmitting port of the RF front-end module, and the other end of the second power amplifier module is electrically connected to the second selection end on the front end side of the front-end switch.

20. The radio frequency front-end module according to claim 18 or 19, characterized in that: The RF front-end module also includes at least one third filter module, one end of the third filter module is electrically connected to the second selection end on the other side of the front-end switch, and the other end of the third filter module is used to electrically connect to the second antenna.

21. A radio frequency system, characterized in that: Comprising at least one RF front-end module as described in any one of claims 17 to 20.

22. An electronic device, characterized in that: Comprising a radio frequency system as claimed in claim 21.

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