CN112994736B - Radio frequency front-end module and antenna device - Google Patents
Radio frequency front-end module and antenna device Download PDFInfo
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- CN112994736B CN112994736B CN202110169154.3A CN202110169154A CN112994736B CN 112994736 B CN112994736 B CN 112994736B CN 202110169154 A CN202110169154 A CN 202110169154A CN 112994736 B CN112994736 B CN 112994736B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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Abstract
In order to solve the problem that mutual interference of signals often occurs due to low isolation when multiple radio frequency signals are received simultaneously in a radio frequency front-end module in the prior art, the invention provides the radio frequency front-end module and an antenna device. According to the radio frequency front-end module provided by the invention, the radio frequency transceiving links are arranged between the two external ports and the two main antenna ports in a symmetrical arrangement mode, so that the radio frequency front-end module is more friendly to an MIMO scene. When the antenna switch selection module receives radio frequency signals, the radio frequency signals do not need to pass through the radio frequency antenna switch module, but directly pass through the low noise amplifier after passing through the gating switch and are transmitted to the baseband module through the radio frequency signal receiving port, and the isolation degree of the radio frequency signals can be increased by the mode, so that the phenomenon of signal interference caused in the antenna switch selection module is effectively avoided.
Description
Technical Field
The invention relates to the field of wireless communication systems of communication terminals, in particular to an antenna device on a communication terminal, and further relates to a radio frequency front-end module in the antenna device.
Background
With the rapid development of mobile communication technology, as shown in fig. 1, a communication terminal 1000 realizes its wireless communication by a built-in antenna device 2000. With the development and application of the fifth generation mobile communication technology (5G), the 5G technology in smart devices, especially mobile terminals, faces new challenges. The realization of the technical advantages of faster network transmission speed, greater network capacity and lower network delay in the 5G technology requires further optimization of the 5G antenna technology. As shown in fig. 2, the conventional antenna apparatus 2000 generally includes a baseband module 2004, an rf transceiver module 2002, an rf front-end module 2001, and an antenna link module 2003; the baseband module 2004 is configured to perform digital baseband signal processing, and perform encoding and decoding of the digital baseband signal; the rf transceiver module 2002 is configured to perform conversion between a digital baseband signal and an analog rf signal, process the digital baseband signal sent by the baseband module 2004 into an rf analog signal, and send the rf analog signal to the rf front-end module 2001, or receive the rf analog signal transmitted by the rf front-end module 2001, convert the rf analog signal into a digital baseband signal, and send the digital baseband signal to the baseband module 2004; the rf front-end module 2001 selectively sends an rf analog signal to the antenna link module 2003 or receives an rf analog signal from the antenna link module 2003, so as to perform amplification, filtering, and other processing on the rf analog signal. The antenna link module 2003 includes an external antenna to receive or transmit the rf analog signal.
In application of the 5G technology to mobile terminals, Multiple Input Multiple Output (MIMO) is an important technology. MIMO is to greatly increase channel capacity, and uses a plurality of antennas at both the transmitting end and the receiving end, and forms a multi-channel antenna system between transmission and reception. However, due to the use of multiple antennas, when it is possible to transmit and receive radio frequency signals in a 1TNR manner, but when it is performed simultaneously, the isolation of multiple radio frequency signals at the antenna switch selection module is too low, which results in the frequent occurrence of mutual interference of signals. For example, fig. 3 discloses a conventional rf front-end module 2001 supporting 1T2R (i.e., supporting one rf signal transmission path and two rf signal reception paths); the rf front-end module 2001 mainly includes an antenna switch selection module 100, an rf signal receiving port RX, an rf signal transmitting port TX, and an antenna port; the antenna switch selection module 100 includes a switch circuit (not labeled in the figure), an external port and an internal port; the external ports include a first external port 101, a second external port 102, a third external port 103, a fourth external port 104 and a fifth external port 105; the internal ports comprise a first internal port 106 and a second internal port 107; the antenna ports comprise a main antenna port and a peripheral antenna port; the primary antenna ports include a first primary antenna port ANT1 and a second primary antenna port ANT 2; the peripheral antenna ports include a first peripheral port AUX1, a second peripheral port AUX2, and a third peripheral port AUX 3. The first external port 101, the second external port 102, the third external port 103, the fourth external port 104 and the fifth external port 105 are respectively connected to the first main antenna port ANT1, the second main antenna port ANT2, the first peripheral port AUX1, the second peripheral port AUX2 and the third peripheral port AUX 3. The antenna port is used for being connected with an antenna, and the receiving and the transmitting of radio frequency signals are realized through the antenna.
The first internal connection port 106 is connected to the first filter 10, and the first filter 10 is connected to the first low noise amplifier 11 and the power amplifier 13 through the gating switch 12; the second internal port 107 is connected to a second filter 20, the second filter 20 being connected to a second low noise amplifier 21; wherein the input end of the power amplifier 13 is connected to the radio frequency signal transmitting port TX, and the output ends of the first low noise amplifier 11 and the second low noise amplifier 21 are connected to the radio frequency signal receiving port RX; thus, the rf front end module 2001 may form a rf signal transmitting path and two rf signal receiving paths; the rf signal transmission path is labeled B, and the two rf signal reception paths are labeled A, C, respectively.
By using the rf front-end module 2001 with the above structure, the antenna switch selection module 100 can be used to select the external antenna in turns. When each external connection, that is, the radio frequency signal is transmitted in the radio frequency signal receiving path B, the corresponding antenna can be selected to transmit the radio frequency signal to the outside by gating the internal switches (transistors) between the first internal connection port 106 and the first to fifth external connection ports 101 to 105. When radio frequency signals are simultaneously received from the first trunk antenna T1 and the second trunk antenna T2 through the radio frequency signal receiving path a and the radio frequency signal receiving path C (the simultaneously received radio frequency signals may be radio frequency signals of the same frequency band or radio frequency signals of different frequency bands), the gating switch 12 is switched to connect with the first low noise amplifier 11, when the rf signal received by the first trunk antenna T1 is coupled to the rf signal receiving path a through the first external port 101 of the antenna switch selection module 100 for transmission and reception, the rf signal received by the second trunk antenna T2 is coupled to the rf signal receiving path C through the second external port 102 of the antenna switch selection module 100 for transmission and reception, the isolation of the two rf signals at the antenna switch selection module 100 is too low, so that mutual interference of the signals often occurs.
Disclosure of Invention
The invention provides a radio frequency front-end module, an antenna device and a communication terminal, aiming at solving the problem that when multiple radio frequency signals are received simultaneously in the radio frequency front-end module in the prior art, the isolation degree of the multiple radio frequency signals at an antenna switch selection module is too low, so that the signals are frequently interfered with each other.
The invention provides a radio frequency front end module, which comprises an antenna switch selection module, a radio frequency signal receiving port, a radio frequency signal transmitting port and an antenna port, wherein the antenna switch selection module comprises an internal connection port and at least two external connection ports;
each radio frequency transceiving link comprises a filter, a gating switch and a low noise amplifier, wherein the first end of the gating switch is connected with the first end of the filter, the second end of the gating switch is connected with the external port, and the third end of the gating switch is connected with the first end of the low noise amplifier; the gating switch is configured to switch the first end to be communicated with the second end or the third end according to a control signal, the second end of the filter is connected to the antenna port, and the second end of the low noise amplifier is connected to the radio frequency signal receiving port.
According to the radio frequency front-end module provided by the invention, the radio frequency transceiving links are arranged between any two external ports and any two antenna ports in a symmetrical mode. For example, two radio frequency signal receiving paths and two radio frequency signal transmitting paths can be established through a first main antenna and a second main antenna which are connected through a first main antenna port and a second main antenna port; and a symmetrical arrangement mode is adopted, so that the MIMO communication system is more friendly to MIMO scenes. When the antenna switch selection module receives radio frequency signals, the radio frequency signals do not need to pass through the antenna switch selection module, but directly pass through the low-noise amplifier after passing through the gating switch and are transmitted to the baseband module through the radio frequency signal receiving port.
Further, the antenna switch selection module includes a first external port and a second external port, and the antenna ports include a first main antenna port and a second main antenna port;
a first radio frequency transceiving link is arranged between the first external port and the first main antenna port, the first radio frequency transceiving link comprises a first filter, a first gating switch and a first low noise amplifier, the first end of the first gating switch is connected with the first end of the first filter, the second end of the first gating switch is connected with the first external port, and the third end of the first gating switch is connected with the first end of the first low noise amplifier; the first gating switch is configured to switch the first end to be communicated with the second end or the third end according to a first control signal; a second end of the first filter is connected to the first main antenna port, and a second end of the first low noise amplifier is connected to the radio frequency signal receiving port;
a second radio frequency transceiving link is arranged between the second external port and the second main antenna port, the second radio frequency transceiving link comprises a second filter, a second gating switch and a second low noise amplifier, the first end of the second gating switch is connected with the first end of the second filter, the second end of the second gating switch is connected with the second external port, and the third end of the second gating switch is connected with the first end of the second low noise amplifier; the second gating switch is configured to switch the first end to be communicated with the second end or the third end according to a second control signal; a second end of the second filter is connected to the second main antenna port, and a second end of the second low noise amplifier is connected to the radio frequency signal receiving port.
Further, the antenna switch selection module further comprises a switch circuit, and the switch circuit is arranged between the external port and the internal port to realize the communication between the external port and the internal port.
Furthermore, the switch circuit is a single-pole N-throw switch circuit, the single-pole N-throw switch circuit includes a control end and N connection ends, the control end is connected to the internal connection port, and each connection end is connected to one of the external connection ports.
Further, the antenna port further includes at least one peripheral antenna port, and the antenna switch selection module further includes at least one peripheral switch port, and one of the peripheral switch ports is connected to one of the peripheral antenna ports.
Further, a peripheral filter is connected in series between the peripheral antenna port and the peripheral switch port.
Further, the antenna ports include a first peripheral antenna port, a second peripheral antenna port, and a third peripheral antenna port, and the peripheral switch ports include a first peripheral switch port, a second peripheral switch port, and a third peripheral switch port, where the first peripheral switch port is connected to the first peripheral port antenna, the second peripheral switch port is connected to the second peripheral antenna port, and the third peripheral switch port is connected to the third peripheral antenna port;
a first peripheral filter is connected in series between the first peripheral switch port and the first peripheral antenna port; a second peripheral filter is connected in series between the second peripheral switch port and the second peripheral antenna port, and a third peripheral filter is connected in series between the third peripheral switch port and the third peripheral antenna port.
Further, the first filter and the second filter are integrated on the same chip.
Further, the first peripheral filter, the second peripheral filter, and the third peripheral filter are integrated on the same chip.
The second aspect of the present invention provides an antenna apparatus, which includes a baseband module, a radio frequency transceiver module, a radio frequency front end module, and an antenna link module; the radio frequency front end module is the radio frequency front end module.
According to the antenna device provided by the invention, the radio frequency transceiving links are arranged between any two external ports and two main antenna ports on the radio frequency front-end module in the antenna device in a symmetrical arrangement mode, and two radio frequency signal receiving paths and two radio frequency signal transmitting paths can be established through the first main antenna and the second main antenna which are connected with the first main antenna port and the second main antenna port; and a symmetrical arrangement mode is adopted, so that the MIMO communication system is more friendly to MIMO scenes. When the antenna switch selection module receives radio frequency signals, the radio frequency signals do not need to pass through the antenna switch selection module, but directly pass through the low-noise amplifier after passing through the gating switch and are transmitted to the baseband module through the radio frequency signal receiving port.
Drawings
Fig. 1 is a schematic diagram of an internal antenna arrangement in a communication terminal;
fig. 2 is a schematic view of an antenna arrangement;
fig. 3 is a schematic diagram of a radio frequency front end module provided in the prior art;
fig. 4 is a schematic diagram of a radio frequency front end module provided in an embodiment of the present invention and an operation principle thereof;
FIG. 5 is a schematic diagram of a further preferred RF front end module provided in an example of an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating an operating principle of the rf front-end module provided in an embodiment of the present invention.
Reference numerals in the background art:
1000. a communication terminal; 2000. an antenna device;
2001. a radio frequency front end module; 2002. a radio frequency transceiver module; 2003. an antenna link module; 2004. a baseband module;
10. a first filter; 11. a first low noise amplifier; 12. a gating switch; 13. a power amplifier; 20. a second filter; 21. a second low noise amplifier; 100. an antenna switch selection module; 101. a first external port; 102. a second external port; 103. a third external port; 104. a fourth external port; 105. a fifth external port; ANT1, a first primary antenna port; ANT2, a second primary antenna port; AUX1, a first peripheral port; AUX2, a second peripheral port; AUX3, third peripheral port; 106. a first internal connection port; 107. a second internal port; RX, radio frequency signal receiving port; TX, radio frequency signal transmit ports; t1, a first main antenna; t2, a second main antenna;
reference numerals in the detailed description:
200. a power amplifier; 300. an antenna switch selection module; 301. a first external port; 302. a second external port; 303. a third external port; 304. a fourth external port; 305. a fifth external port; 306. an internal connection port; 401. a first filter; 402. a first gate switch; 403. a first low noise amplifier; 501. a second filter; 502. a second gate switch; 503. a second low noise amplifier; ANT1, a first primary antenna port; ANT2, a second primary antenna port; AUX1, a first peripheral port; AUX2, a second peripheral port; AUX3, third peripheral port; 601. a first peripheral filter; 701. a second peripheral filter; 801. a third peripheral filter; RX, radio frequency signal receiving port; TX, radio frequency signal transmit ports; t1, a first backbone antenna; t2, second backbone antenna.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present embodiment will specifically explain the communication terminal, the antenna device and the rf front-end module disclosed in the present invention. The communication terminal, antenna device of the present application are as described in the background. The communication terminal comprises the antenna device, and of course, the communication terminal comprises other modules, such as a processor, a user interface, a memory, and the like, besides the antenna device. The communication terminal is, for example, a Personal Digital Assistant (PDA), a cellular phone, a card in a notebook computer, a wireless tablet computer, or the like. The antenna device comprises a baseband module, a radio frequency transceiver module, a radio frequency front-end module, an antenna link module and the like, the general framework of the antenna device is similar to that in the background technology, and the radio frequency front-end module is improved as the main innovation of the antenna device, so the baseband module, the radio frequency transceiver module, the antenna link module and the like are not specifically explained, and only the radio frequency front-end module is specifically explained below.
As shown in fig. 4, the rf front-end module provided in this embodiment includes an antenna switch selection module 300, an rf signal receiving port RX, an rf signal transmitting port TX, and an antenna port; the antenna switch selection module 300 includes an internal port 306 and at least two external ports; the rf signal transmitting port TX is connected to the internal port 306 through a transmitting link, and each external port is connected to one of the antenna ports through an rf transceiving link.
Each radio frequency transceiving link comprises a filter, a gating switch and a low noise amplifier, wherein the first end of the gating switch is connected with the first end of the filter, the second end of the gating switch is connected with the external port, and the third end of the gating switch is connected with the first end of the low noise amplifier; the gating switch is configured to switch the first end to be communicated with the second end or the third end according to a control signal, the second end of the filter is connected to the antenna port, and the second end of the low noise amplifier is connected to the radio frequency signal receiving port.
Wherein, the transmitting chain is used for transmitting radio frequency signals. The transmit chain includes, but is not limited to, a power amplifier 200 (PA). Such as: the transmission link further comprises an attenuator for attenuating signals, or further comprises a filter for filtering signals, and the like.
Wherein the gate switch is configured to switch the first terminal to communicate with the second terminal or the third terminal according to a control signal. When radio frequency signal transmission is carried out, the control signal controls the first end of the gating switch to be switched to be connected with the second end, and the radio frequency signal transmitted from the transmission link is sent to the antenna port for signal transmission; when receiving radio frequency signals, the control signal controls the gated first end to be switched to be connected with the third end, and the radio frequency signals received from the antenna are sent to the low noise amplifier for amplification processing.
The switch circuit is arranged between the external port and the internal port 306 so as to realize the communication between the external port and the internal port 306;
in this example, specifically, the connection of the rf signal transmission port TX to the internal port 306 through the transmission link is implemented by the following steps: the internal port 306 is connected to a radio frequency signal transmitting port TX through a power amplifier 200;
the antenna ports include a first main antenna port ANT1 and a second main antenna port ANT 2; the first main antenna port ANT1 is used to connect to the first main antenna T1, and the second main antenna port ANT2 is used to mount the second main antenna T2. The external connection ports comprise a first external connection port 301 and a second external connection port 302;
a first radio frequency transceiving link is arranged between the first external port 301 and the first main antenna port ANT 1; the first radio frequency transceiving link comprises a first filter 401, a first gating switch 402 and a first low noise amplifier 403; three ports of the first gating switch 402 are respectively connected to a first external port 301, a first low-noise amplifier 403 and a first filter 401 (i.e. a first end of the first gating switch 402 is connected to a first end of the first filter 401, a second end is connected to the first external port 301, and a third end is connected to a first end of the first low-noise amplifier 403; the first gating switch 402 is configured to switch the first end to be communicated with the second end or the third end according to a first control signal); the first filter 401 is connected to a first main antenna port ANT1, the first low noise amplifier 403 is connected to a radio frequency signal receiving port RX;
a second radio frequency transceiving link is arranged between the second external port 302 and the second main antenna port ANT 2; the second radio frequency transceiving link comprises a second filter 501, a second gating switch 502 and a second low noise amplifier 503; three ports of the second gating switch 502 are respectively connected to a second external port 302, a second low noise amplifier 503 and a second filter 501 (i.e. a first end of the second gating switch 502 is connected to a first end of the second filter 501, a second end is connected to the second external port 302, and a third end is connected to the first end of the second low noise amplifier 503; the second gating switch 502 is configured to switch the first end to be communicated with the second end or the third end according to a second control signal); the second filter 501 is connected to a second main antenna port ANT2, and the first low noise amplifier 403 is connected to a radio frequency signal receiving port RX.
In this example, the first rf transceiving link includes a first rf signal receiving link D and a first rf signal transmitting link C; the second radio frequency transceiving link comprises a second radio frequency signal receiving link B and a second radio frequency signal transmitting link A. A first rf signal transmitting link is formed among the rf signal transmitting port TX, the power amplifier 200, the antenna switch selecting module 300, the first gating switch 402, the first filter 401, and the first main antenna port ANT 1. A second rf signal transmitting chain is formed among the rf signal transmitting port TX, the power amplifier 200, the antenna switch selection module 300, the second gate switch 502, the second filter 501, and the second main antenna port ANT 2. A first rf signal receiving link is formed between the first main antenna port ANT1, the first filter 401, the first gate switch 402, the first low noise amplifier 403, and the rf signal receiving port RX, and a second rf signal receiving link is formed between the second main antenna port ANT2, the second filter 501, the second gate switch 502, the second low noise amplifier 503, and the rf signal receiving port RX.
In this example, the internal port 306 includes one, but is not limited to one, and may be extended to a plurality of ports. Such as two or more. The external ports are mainly used for being connected with the antenna ports, and the number of the external ports can be set according to the number of the antenna ports. As for the antenna ports, the types thereof may generally include a main antenna port and a peripheral antenna port. The main antenna ports typically include 2-3 ports for mounting 2-3 trunk antennas. The peripheral antenna port is an expansion port which can be connected with a plurality of peripheral antennas in an expansion mode. The two main antenna switch ports can be used for installing two main antennas, and the 3 peripheral antenna ports can be used for installing 2-3 peripheral antennas, but only 2 peripheral antennas are generally installed, one peripheral antenna port is connected in an idle mode, and no peripheral antenna is installed.
In this example, the first Low Noise Amplifier 403 and the second Low Noise Amplifier 503 are Low Noise amplifiers (hereinafter referred to as "Low Noise amplifiers") having very Low Noise figure. In the case of amplifying a weak signal, the noise of the amplifier itself may cause serious interference to the signal, and therefore it is desirable to reduce the noise of the amplifier itself to improve the signal-to-noise ratio of the output. The low noise amplifier is well known to those skilled in the art, and can further amplify the received rf signal and output the amplified rf signal to the rf transceiver module.
The input end of the power amplifier 200 is connected to the rf signal transmitting port TX for receiving the rf signal transmitted by the rf transceiver module 2. Because the radio frequency signal power output by the radio frequency transceiver module is very small, the radio frequency signal can be fed to the antenna to be radiated after a series of amplification to obtain enough radio frequency power. In order to obtain a sufficient rf output power, the power amplifier 200 is required, and the power amplifier 200 is also well known to those skilled in the art and will not be described in detail.
In this embodiment, the first filter 401 and the second filter 501 are disposed between the antenna switch selection module 300 and the antenna port, and are configured to filter the radio frequency signal amplified by the power amplifier 200 and transmit the filtered radio frequency signal to the antenna port, or filter the received radio frequency signal from the antenna port and transmit the filtered radio frequency signal to the first low noise amplifier 403 and the second low noise amplifier 503; the first filter 401 and the second filter 501 in this example are used for bidirectional filtering, and filters of different specifications are selected according to frequency bands required to pass through, so as to determine which frequency bands of radio frequency signals are allowed to pass through, and signals of other frequency bands are inhibited from passing through. The choice of filter is well known to those skilled in the art. It can be selected according to the design need and is not described in detail.
A switch circuit is arranged in the antenna switch selection module 300, the switch circuit is a single-pole N-throw switch circuit, the single-pole N-throw switch circuit includes a control end and N connection ends, the control end is connected with the internal connection port 306, and each connection end is connected with one of the external connection ports. Which is known to the public.
In the present application, an antenna installed at the first main antenna port ANT1 is a first main antenna T1, an antenna installed at the second main antenna port ANT2 is a second main antenna T2, and the antennas are generally SRS (Sounding Reference Signal, chinese name) antennas. The SRS antenna is adopted to realize the round sending of radio frequency signals (SRS round sending for short), and the SRS round sending refers to the physical antenna on which the communication terminal sends SRS information. The communication terminal transmits SRS information is one of the ways for the base station to probe the terminal position and channel quality. The more the number of antennas capable of participating in transmitting the reference signal is, the more accurate the channel estimation is, and the higher the rate can be obtained; if the antenna is only used for transmitting, other antenna information is lost, the antenna is not fully utilized, and the highest rate is difficult to obtain. The radio frequency front-end module can complete signal transmission and reception of various frequency bands on 2-5 antennas. In this example, assuming that two SRS antennas are also connected to the peripheral antenna port, the round transmission of radio frequency signals can be completed on 4 antennas, and generally in this example, the round transmission of radio frequency signals is completed by fixing the antennas to the two antennas, in this example, the reception and transmission of radio frequency signals in the N77 frequency band can be realized through the first radio frequency transceiving link, and the reception and transmission of radio frequency signals in the N79 frequency band can be realized through the second radio frequency transceiving link. And can select among the 4 antennas described above. It should be noted that, the radio frequency signal that can be transmitted/received in the present scheme may be a signal in any other frequency band besides the n77/n79 frequency band, and the present scheme does not make any limitation on the frequency band of the transmitted/received radio frequency signal.
Preferably, the radio frequency transceiving link may be additionally disposed between the peripheral antenna port and the external port to expand a path of radio frequency receiving or transmitting.
In this example, as a preferable mode, a filter is connected in series between the peripheral antenna port and the external port. Through the filter, the stray signals of the radio frequency signals on each antenna can be further filtered. Specifically, the external ports in this example further include a third external port 303 (or called a first peripheral switch port), a fourth external port 304 (or called a second peripheral switch port), and a fifth external port (or called a third peripheral switch port) 305; the peripheral antenna ports include a first peripheral port AUX1, a second peripheral port AUX2, and a third peripheral port AUX 3; the third external port 303 is connected to the first peripheral port AUX1, the fourth external port 304 is connected to the second peripheral port AUX2, and the fifth external port 305 is connected to the third peripheral port AUX 3.
As shown in fig. 5, a first peripheral filter 601 is connected in series between the third external port 303 and the first peripheral port AUX 1; a second peripheral filter 701 is connected in series between the fourth external port 304 and the second peripheral port AUX 2; a third peripheral filter 801 is connected in series between the fifth external port 305 and the third peripheral port AUX 3.
Wherein the first filter 401 and the second filter 501 are integrated on a chip. For example, the first filter 401 and the second filter 501 may be mounted on the same DIE (DIE), or Integrated on LTCC (Low Temperature Co-fired ceramic) or IPD (Integrated Product Development). Similarly, the first peripheral filter 601, the second peripheral filter 701, and the third peripheral filter 801 may be integrated on the same chip. Each DIE (DIE) is a separate functional, unpackaged chip that may consist of one or more circuits, but will eventually be packaged as a unit into what is commonly referred to as a DIE.
Preferably, the first gate switch 402 and the second gate switch 502 may be integrated on the same chip, or the first gate switch 402 and the second gate switch 502 may be provided on different chips. But with separate circuits and interfaces. By integrating the first gate switch 402 and the second gate switch 502 on the same chip, the occupied area of the rf front-end module can be reduced to some extent. By arranging the first gating switch 402 and the second gating switch 502 on different chips, when the radio frequency signals are transmitted in the first radio frequency signal transceiving link and the second radio frequency signal transceiving link at the same time, the interference between the radio frequency signals can be further reduced, and the isolation of the signals can be improved.
The working process is described as follows: as shown in fig. 6, when it transmits a radio frequency signal, the radio frequency signal is input from the radio frequency signal transmission port TX, and enters the internal port 306 through the power amplifier 200, and the internal port 306 is gated and connected to the first external port 301 or the second external port 302; gating the first gating switch 402 to the first external port 301 or gating the second gating switch 502 to the second external port 302; and after being filtered by the first filter 401 or the second filter 501, the radio frequency signal is transmitted through the first trunk antenna T1 or the second trunk antenna T2. That is, after being input from the rf signal transmitting port TX, the rf signal is transmitted through the power amplifier 200 and the antenna switch selecting module 300 through the a or C.
When receiving radio frequency signals, the radio frequency signals are received from the first main antenna T1, and then transmitted to the radio frequency transceiver module through the radio frequency signal receiving port RX after passing through the first main antenna port ANT1, the first filter 401, the first gate switch 402, and the first low noise amplifier 403, that is, the radio frequency signals are received to the radio frequency signal receiving port RX through D. Or, after receiving the radio frequency signal from the second main antenna T2, the radio frequency signal passes through the second main antenna port ANT2, the second filter 501, the second gating switch 502, and the second low noise amplifier 503, and then is transmitted to the radio frequency transceiver module through the radio frequency signal receiving port RX. The rf signal is received through B to the rf signal receiving port RX.
It can be seen that when two rf signals with different frequencies simultaneously pass through the first rf signal receiving link and the second rf signal receiving link, it does not need to pass through the antenna switch selection module 300, the first gating switch 402 and the second gating switch 502 of the antenna switch selection module 300 are disconnected from the first peripheral port AUX1 and the second peripheral port AUX2, and the external port and the internal port 306 of the antenna switch selection module 300 are also disconnected, so that there are at least 4 isolations physically (i.e., between the first gating switch 402 and the first external port 301, between the first external port 301 and the internal port 306, between the internal port 306 and the second external port 302, and between the second external port 302 and the second gating switch 502 are disconnected). The mode can effectively ensure multiple isolation when the two paths of radio frequency signals are received simultaneously, and the condition of mutual interference of the signals is prevented.
According to the communication terminal, the antenna device and the radio frequency front-end module, the radio frequency transceiving links are arranged between the two external ports and the two main antenna ports in a symmetrical mode, and two radio frequency signal receiving paths and two radio frequency signal transmitting paths can be established through a first main antenna T1 and a second main antenna T2 which are connected through a first main antenna port ANT1 and a second main antenna port ANT 2; and a symmetrical arrangement mode is adopted, so that the MIMO communication system is more friendly to MIMO scenes. When the radio frequency signal is received, the radio frequency signal does not need to pass through the radio frequency antenna switch module, but directly passes through the low noise amplifier after passing through the gating switch, and is transmitted to the baseband module through the radio frequency signal receiving port RX, and the isolation degree of the radio frequency signal receiving port RX can be increased by the mode, so that the phenomenon of signal interference caused in the antenna switch selection module 300 is effectively avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A radio frequency front end module comprises an antenna switch selection module, a radio frequency signal receiving port, a radio frequency signal transmitting port and an antenna port, wherein the antenna switch selection module comprises an internal connection port and at least two external connection ports, the radio frequency signal transmitting port is connected to the internal connection port through a transmitting link, and each external connection port is connected to one antenna port through a radio frequency receiving and transmitting link;
each radio frequency transceiving link comprises a filter, a gating switch and a low noise amplifier, wherein the first end of the gating switch is connected with the first end of the filter, the second end of the gating switch is connected with the external port, and the third end of the gating switch is connected with the first end of the low noise amplifier; the gating switch is configured to switch the first end to be communicated with the second end or the third end according to a control signal, the second end of the filter is connected to the antenna port, and the second end of the low noise amplifier is connected to the radio frequency signal receiving port.
2. The rf front-end module of claim 1, wherein the antenna switch selection module includes a first external port and a second external port, and the antenna ports include a first primary antenna port and a second primary antenna port;
a first radio frequency transceiving link is arranged between the first external port and the first main antenna port, the first radio frequency transceiving link comprises a first filter, a first gating switch and a first low noise amplifier, the first end of the first gating switch is connected with the first end of the first filter, the second end of the first gating switch is connected with the first external port, and the third end of the first gating switch is connected with the first end of the first low noise amplifier; the first gating switch is configured to switch the first end to be communicated with the second end or the third end according to a first control signal; a second end of the first filter is connected to the first main antenna port, and a second end of the first low noise amplifier is connected to the radio frequency signal receiving port;
a second radio frequency transceiving link is arranged between the second external port and the second main antenna port, the second radio frequency transceiving link comprises a second filter, a second gating switch and a second low noise amplifier, the first end of the second gating switch is connected with the first end of the second filter, the second end of the second gating switch is connected with the second external port, and the third end of the second gating switch is connected with the first end of the second low noise amplifier; the second gating switch is configured to switch the first end to be communicated with the second end or the third end according to a second control signal; a second end of the second filter is connected to the second main antenna port, and a second end of the second low noise amplifier is connected to the radio frequency signal receiving port.
3. The rf front-end module of claim 1, wherein the antenna switch selection module further comprises a switch circuit disposed between the external port and the internal port to enable communication between the external port and the internal port.
4. The rf front-end module of claim 3, wherein the switch circuit is a single-pole-N-throw switch circuit, the single-pole-N-throw switch circuit including a control terminal and N connection terminals, the control terminal being connected to the internal port, each connection terminal being connected to one of the external ports.
5. The rf front-end module of claim 2, wherein the antenna ports further comprise at least one peripheral antenna port, and the antenna switch selection module further comprises at least one peripheral switch port, each peripheral switch port being connected to one of the peripheral antenna ports.
6. The RF front-end module of claim 5, wherein a peripheral filter is coupled in series between the peripheral antenna port and the peripheral switch port.
7. The radio frequency front end module of claim 5, wherein the antenna ports comprise a first peripheral antenna port, a second peripheral antenna port, and a third peripheral antenna port, and the peripheral switch ports comprise a first peripheral switch port, a second peripheral switch port, and a third peripheral switch port;
the first peripheral switch port is connected with the first peripheral port antenna, the second peripheral switch port is connected with the second peripheral antenna port, and the third peripheral switch port is connected with the third peripheral antenna port;
a first peripheral filter is connected in series between the first peripheral switch port and the first peripheral antenna port; a second peripheral filter is connected in series between the second peripheral switch port and the second peripheral antenna port, and a third peripheral filter is connected in series between the third peripheral switch port and the third peripheral antenna port.
8. The rf front-end module of claim 2, wherein the first filter and the second filter are integrated on a same chip.
9. The RF front-end module of claim 7, wherein the first peripheral filter, the second peripheral filter, and the third peripheral filter are integrated on a same chip.
10. An antenna device comprises a baseband module, a radio frequency transceiving module, a radio frequency front-end module and an antenna link module; wherein the rf front-end module is according to any one of claims 1 to 9.
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| CN202110169154.3A CN112994736B (en) | 2021-02-07 | 2021-02-07 | Radio frequency front-end module and antenna device |
| PCT/CN2022/073515 WO2022166653A1 (en) | 2021-02-07 | 2022-01-24 | Radio frequency front-end module and antenna apparatus |
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| CN202110169154.3A CN112994736B (en) | 2021-02-07 | 2021-02-07 | Radio frequency front-end module and antenna device |
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| CN112994736B (en) * | 2021-02-07 | 2022-05-06 | 锐石创芯(深圳)科技股份有限公司 | Radio frequency front-end module and antenna device |
| CN115347894B (en) * | 2022-10-17 | 2023-02-10 | 杭州岸达科技有限公司 | Radio frequency interface circuit and multi-chip cascade method based on radio frequency interface circuit |
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| CN112994736A (en) | 2021-06-18 |
| WO2022166653A1 (en) | 2022-08-11 |
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Address after: 518000 room 2001, building 3, Shenzhen new generation industrial park, 136 Zhongkang Road, Meidu community, Meilin street, Futian District, Shenzhen City, Guangdong Province Applicant after: Ruishi Chuangxin (Shenzhen) Technology Co.,Ltd. Address before: 518000 room 2001, building 3, Shenzhen new generation industrial park, 136 Zhongkang Road, Meidu community, Meilin street, Futian District, Shenzhen City, Guangdong Province Applicant before: AN ADVANCED RF POWER AMPLIFIER AND COMMUNICATION DEVICE |
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