Miniaturized low-time-delay multi-communication-link fusion radio frequency circuit

Abstract

The invention discloses a miniaturized and low-delay multi-communication-link fusion radio frequency circuit, which comprises five communication links of LORA / NBIOT / GNSS / WIFI / BLE, and the communication links with different physical characteristics are respectively constructed by corresponding amplification circuits, radio frequency switching circuits, filtering isolation circuits and multi-frequency transceiving antennas. The fusion of multiple communication links adopts two architecture modes of a power amplifier, a switch module and an antenna and a power amplifier, a switch module, a filter, a duplexer and an antenna. Compared with the prior art, the method has the advantages that fusion transmission of multiple communication systems can be achieved, the simplified physical channel building mode can effectively avoid multi-dimensional communication conflicts, network time delay is reduced, and higher system capacity and spectrum utilization efficiency are obtained.

Description

Technical Field

[0001] The present invention belongs to the field of communication transceiver links, and in particular to a miniaturized, low-latency, multi-communication link fused radio frequency circuit. Background Art

[0002] With the rapid development of information technology, portable and wearable communication devices are still facing severe tests of complex information environment and the functions and performance of the devices themselves. At present, most terminal devices have a relatively single communication mode, which makes it difficult to support the rapid transmission and reception of information of different types and multiple communication terminals. The production and application of multi-mode communication terminals effectively alleviates the real-time transmission problem of various communication methods, but the information transmission method is limited to satellite communication, the information transmission efficiency is low, and the device itself is large in size, which is not conducive to the lightweight design of portable and wearable devices. Therefore, a new technical solution is urgently needed to solve the existing technical difficulties. Summary of the invention

[0003] In order to solve the technical problems of single communication mode, low transmission efficiency and large size of portable and wearable communication devices, the present invention discloses a miniaturized, low-latency multi-communication link integrated RF transmission circuit, which is used for efficient real-time transmission of information in five communication modes: LORA / NBIOT / GNSS / WIFI / BLE, solving the problem of single communication mode of portable and wearable communication devices. The fusion architecture design of power amplifier + switch module + antenna and power amplifier + switch module + filter + duplexer + antenna effectively improves the efficiency of information transmission. At the same time, the chips selected for circuit design are all in the millimeter range, the antenna adopts the LDS process, and the overall size of the RF transmission circuit is small, which can meet the requirements of miniaturization of portable and wearable communication devices.

[0004] The technical solution to achieve the purpose of the present invention is:

[0005] A miniaturized, low-latency, multi-communication link integrated radio frequency circuit, characterized in that it includes a LORA transceiver circuit, an NBIOT transceiver circuit, a GNSS receiving circuit, a WIFI transceiver circuit, a BLE transceiver circuit, a first dual-frequency antenna and a second dual-frequency antenna; the LORA transceiver circuit and the NBIOT transceiver circuit adopt a circuit architecture combining a power amplifier, a switch module and a first dual-frequency antenna to achieve frequency division multiplexing, time division multiplexing and simultaneous co-frequency multi-node transmission of three-channel signals; the GNSS receiving circuit, the WIFI transceiver circuit and the BLE transceiver circuit adopt a circuit architecture combining a power amplifier, a switch module, a filter, a duplexer and a second dual-frequency antenna to achieve frequency division multiplexing, time division multiplexing and simultaneous co-frequency multi-node transmission of three-channel signals.

[0006] In the LORA transceiver circuit: the LORA receiving RF interface, the first RF switch, the second RF switch, the first interface spring and the first dual-frequency antenna are connected in sequence and receive UHF low-frequency non-network communication signals; the LORA sending RF interface, the first amplifier, the first RF switch, the second RF switch, the first interface spring and the first dual-frequency antenna are connected in sequence and send UHF low-frequency non-network communication signals.

[0007] In the NBIOT transceiver circuit: the NBIOT transceiver RF interface, the second RF switch, the first interface spring and the first dual-frequency antenna are connected in sequence to receive and send UHF low-frequency band Internet of Things communication signals.

[0008] In the GNSS receiving circuit: the GNSS receiving radio frequency interface, the second amplifier, the first duplexer, the second interface spring and the second dual-frequency antenna are connected in sequence to receive the Beidou positioning signal.

[0009] In the WIFI transceiver circuit: the WIFI transceiver RF interface, the third RF switch, the first filter, the first duplexer, the second interface spring and the second dual-frequency antenna are connected in sequence to receive and send UHF high frequency band WIFI signals.

[0010] In the BLE transceiver circuit, the BLE transceiver RF interface, the third RF switch, the first filter, the first duplexer, the second interface spring and the second dual-frequency antenna are connected in sequence to receive and send UHF high frequency band BLE signals.

[0011] The first RF switch is turned on through the LORA transceiver channel switching enable signal to realize the time division multiplexing of the LORA transceiver channel, and the second RF switch is turned on through the LORA / NBIOT channel switching enable signal to realize the time division and frequency division multiplexing of the LORA and NBIOT channels. The first dual-frequency antenna realizes the frequency division multiplexing and signal transmission of the LORA and NBIOT channels. Among them, the NBIOT channel itself meets the multi-node concurrent transmission mode of the same frequency at the same time. The power amplifier + switch module + antenna architecture design adopted integrates the three transmission channels of LORA reception, transmission and NBIOT transceiver. During multi-dimensional transmission, its physical transmission delay is only 1 / 2 of the traditional multi-channel transmission delay, and the switching delay is only 0.28μs.

[0012] The third RF switch is turned on through the WIFI / BLE channel switching enable signal to realize time division multiplexing and signal transmission of WIFI and BLE channels. The first duplexer and the second dual-frequency antenna realize frequency division multiplexing and signal transmission of GNSS, WIFI and BLE channels. Among them, the GNSS, WIFI and BLE channels themselves meet the multi-node concurrent transmission mode of the same frequency at the same time. The power amplifier + switch module + filter + duplexer + antenna architecture design adopted integrates the three transmission channels of GNSS / WIFI / BLE. During multi-dimensional transmission, its physical transmission delay is only 1 / 3 of the traditional multi-channel transmission delay, and the switching delay is only 0.28μs.

[0013] Compared with the prior art, the present invention has the following significant advantages:

[0014] The present invention discloses a miniaturized, low-latency radio frequency circuit that integrates multiple communication links. Compared with traditional multi-mode satellite communications, it adopts two simplified radio frequency front-end circuit architecture designs: power amplifier + switch module + antenna and power amplifier + switch module + filter + duplexer + antenna, integrating more communication links, and the transmission delay is only 1 / 2 to 1 / 3 of the traditional switch module architecture design. At the same time, this architecture realizes time division multiplexing, frequency division multiplexing, and simultaneous multi-node concurrent communication at the same frequency, which can meet the high concurrent transmission efficiency of multiple nodes. In summary, its simplified physical channel construction method effectively avoids multi-dimensional communication conflicts, reduces network latency, and obtains higher system capacity and spectrum utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A block diagram of the principle architecture of a miniaturized, low-latency, multi-communication link fusion radio frequency circuit provided by the present invention;

[0016] Figure 2 A connection circuit diagram of the LORA receiving link, transmitting link, first amplifier and first radio frequency switch provided by the present invention;

[0017] Figure 3 A connection circuit diagram of the LORA / NBIOT transceiver link, the second radio frequency switch and the first dual-frequency antenna provided by the present invention;

[0018] Figure 4 A connection circuit diagram of a GNSS receiving signal and a second amplifier provided by the present invention;

[0019] Figure 5 A connection circuit diagram of a WIFI / BLE transceiver link, a third RF switch and a first filter provided by the present invention;

[0020] Figure 6 A connection circuit diagram of a WIFI / BLE / GNSS transceiver link, a first duplexer and a second dual-frequency antenna provided by the present invention;

[0021] Figure 7 The timing design diagram of the LORA / NBIOT / GNSS / WIFI / BLE communication link provided by the present invention;

[0022] Figure 8 Structural diagram of the first dual-frequency antenna and the second dual-frequency antenna provided by the present invention;

[0023] Fig. 9 The whole device S parameter diagram of the first dual-frequency antenna and the second dual-frequency antenna provided by the present invention;

[0024] Fig.10 The E-plane gain diagram of the first dual-frequency antenna and the second dual-frequency antenna provided by the present invention, wherein (a) is the LORA frequency band; (b) is the NBIOT frequency band; (c) is the GNSS frequency band; (d) is the WIFI / BLE frequency band;

[0025] Fig.11 H-plane gain diagram of the first dual-frequency antenna and the second dual-frequency antenna provided by the present invention, wherein (a) is the LORA frequency band; (b) is the NBIOT frequency band; (c) is the GNSS frequency band; and (d) is the WIFI / BLE frequency band. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. The technical solution of the present invention is further described in conjunction with the accompanying drawings. If no specific technology or conditions are specified in the embodiments, the technology or conditions described in the literature in the field or the product manual shall be followed.

[0027] The following is a further introduction based on the attached principle architecture diagram and specific implementation steps.

[0028] like Figure 1 As shown, the present invention discloses a miniaturized, low-latency, multi-communication link fusion radio frequency circuit, including two LDS dual-frequency antennas and a circuit board. The circuit board includes a LORA transceiver circuit, an NBIOT transceiver circuit, a GNSS receiving circuit, a WIFI transceiver circuit, a BLE transceiver circuit, and an antenna interface spring.

[0029] A miniaturized, low-latency, multi-communication link fusion RF circuit architecture method is:

[0030] The LORA transceiver circuit and the NBIOT transceiver circuit adopt the circuit architecture of power amplifier + switch module + antenna to realize frequency division multiplexing, time division multiplexing and simultaneous co-frequency transmission of three-channel signals, and the switching delay is only 0.28μs. At the same time, the GNSS receiving circuit, WIFI transceiver circuit and BLE transceiver circuit adopt the circuit architecture of power amplifier + switch module + filter + duplexer + antenna to realize frequency division multiplexing, time division multiplexing and simultaneous co-frequency transmission of three-channel signals, and the switching delay is only 0.28μs. The filter + duplexer + dual-frequency antenna structure realizes the physical frequency selection and channel isolation of GNSS / WIFI / BLE channels.

[0031] A circuit physical connection method of a miniaturized, low-latency, multi-communication link fusion radio frequency circuit is:

[0032] like Figure 2 As shown, the circuit of the LORA transmit and receive link includes: a first power amplifier U1 F280, a first RF switch U2 WS7872DA-6 / TR, inductors L1, L2, L3, capacitors C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, and resistors R1, R2, R9;

[0033] The LORA transmission signal passes through the LORA_TX interface, parallel matching capacitor C1, series matching inductor L1 and series matching resistor R1, and is input into the RFIN-1 and RFIN-2 pins of the first power amplifier U1 F280; the amplified input signal is output by the RFOUT-1 and RFOUT-2 pins of the first power amplifier U1 F280, and is connected in sequence to the series matching inductor L3, parallel matching capacitor C7, series matching, and DC blocking capacitor C3 to input the RF1 pin of the first RF switch U2; when the LORA transmission trigger enable signal TXEN is input into the EN1 pin of the first RF switch U2, the LORA transmission channel is opened, and its voltage stabilizing capacitor C6 is placed between the EN1 pin of the first RF switch U2 and the ground; the ANT pin of the first RF switch U2 is connected to the DC blocking capacitor C4 to transmit the LORA signal.

[0034] The voltage stabilizing filter capacitors C8, C9, C10 and C11 are connected in parallel between the RFOUT-1 and RFOUT-2 pins of the first power amplifier U1 and the 5V power supply pin VDD5V_LORA of the LORA amplifier, and the power supply filter inductor L2 is connected in series to control the drain power supply of the power amplifier; the matching resistor R2 and the switch bias resistor R9 are connected in series between the current reference bias pin IRFE of the first power amplifier U1 and the 5V power supply pin VDD5V_LORA of the LORA amplifier in turn to control the gate power supply of the power amplifier; the NC1, NC2, NC3, NC4, NC5, NC6, NC7, NC8, NC9 and GND pins of the first amplifier and the GND pin of the first RF switch are grounded.

[0035] The LORA signal is input into the RF2 pin of the first RF switch U2 through the LORA_RX interface and the matching capacitor C2. When the LORA reception trigger enable signal RXEN is input into the EN2 pin of the first RF switch U2, the LORA receiving channel is opened, and its voltage stabilizing capacitor C5 is placed between the EN2 pin of the first RF switch U2 and the ground; then the ANT pin of the first RF switch U2 is connected to the DC blocking capacitor C4 to receive the LORA signal.

[0036] like Figure 3 As shown, the circuit of the LORA / NBIOT transceiver link includes: a second RF switch U3, resistors R3, R4, R5, R6, capacitors C12, C13, C14, an inductor L4, an interface spring J1 and a first RF antenna;

[0037] The LORA signal is input to the RF1 pin of the second RF switch U3 through the LORA_RF interface and the series matching resistor R3; the NBIOT signal NB_RF is input to the RF2 pin of the second RF switch U3 through the series DC blocking capacitor C12 and the matching resistor R4 in turn; the VDD pin of the second RF switch is connected to the 3V3 power pin VDDIO33 through the filter inductor L4, the VDD pin is high, the LORA channel is turned on, the NBIOT channel is turned off, and the LORA signal is transmitted. Its voltage stabilizing capacitor C14 is placed between the VDD pin and the ground of the second RF switch U3; the LORA / NBIOT channel switching signal is input to the VC pin of the second RF switch by the MCU_LORA_NB interface through the resistor R6 and the parallel voltage stabilizing capacitor C13; when the MCU_LORA_NB interface enable signal is high, the LORA channel is turned off and the NBIOT channel is turned on; the selected signal is then connected to the first dual-frequency antenna through the middle ANT pin series matching resistor R5 through the interface spring J1 to radiate or receive the LORA / NBIOT signal to space. In addition, the GND pin of the second RF switch is grounded.

[0038] like Figure 4 As shown, the circuit of the GNSS receiving link includes: a second amplifier U4, capacitors C15, C16, C17, C18, C25, and inductors L5 and L6;

[0039] The GNSS signal is connected to the DC blocking capacitor C18 through the GNSS_RF interface and input to the AO pin of the second amplifier U4; it is amplified by the low noise amplifier U4 and then output through the AI ​​pin in series with the matching inductor L6 and the matching capacitor C25. The second amplifier U4 is powered by the 3V3 power supply pin VDD3V3_GPS, and the voltage stabilizing filter capacitors C15, C16 and C17 and the filter inductor L5 are connected between the PON pin of the second amplifier U4, the 3V3 power supply VDD3V3_GPS and the ground. In addition, the GND and GNDRF pins of the second amplifier are grounded.

[0040] like Figure 5 As shown, the circuit of the WIFI / BLE transceiver link includes: a third RF switch U5, a first filter U6, capacitors C19, C20, C21, C22, C23; inductors L7, L8, L9, and a resistor R10;

[0041] The BLE signal is input into the RF1 pin of the third RF switch U5 through the BLE_RF interface in series with the DC blocking capacitor C19; the WIFI signal is input into the RF2 pin of the third RF switch U5 through the WIFI_RF interface in series with the DC blocking capacitor C20; the VDD pin of the third RF switch is connected to the 3V3 power supply VDDIO33 pin through the filter inductor L7, the VDD pin is pulled high, the BLE channel is turned on, and the WIFI channel is turned off, and its voltage stabilizing capacitor C23 is connected between the VDD pin of the third RF switch U5 and the ground; BLE / WIFI channel switching enable signal When the MCU_WIFI_BLE_RFSW interface is connected in series with resistor R10 and in parallel with voltage stabilizing capacitor C21 and input into the VC pin of the third RF switch U5, the BLE channel is closed and the WIFI channel is opened; the selected signal is then connected in series with the DC blocking capacitor C22 through the ANT pin of the third RF switch U5, and the matching inductor is connected to the OUTPUT pin of the first filter U6 in parallel, and is filtered by the first filter and output to the BLE / WIFI signal interface BLE / WIFI_RF in a time-sharing manner through the INPUT pin of the filter and the matching inductor L9 in parallel. In addition, the GND pin of the third RF switch U5 and the GND1, GND2 and GND3 pins of the first filter U6 are grounded.

[0042] like Figure 6 As shown, the circuit of the GNSS_RF / BLE / WIFI transceiver link includes: a first duplexer U7, a resistor R7, a resistor R8, a capacitor C24, a second interface spring J2 and a second RF antenna;

[0043] The GNSS signal is input into the low frequency pin LF_PORT of the first duplexer U7 through the GNSS_RF interface, and the BLE / WIFI signal is input into the intermediate frequency pin MH_PORT of the first duplexer U7 through the BLE / WIFI_RF interface in series with the DC blocking capacitor C24, and transmitted through the first duplexer U7 by frequency division and combination, and then connected in series with the matching resistor R8 through the COM_PORT pin of the first duplexer U7, and output to the second dual-frequency antenna through the second interface spring J2, radiating and receiving signals into space. In addition, the high frequency pin HF_PORT of the first duplexer U7 is connected to the matching resistor R7 for grounding.

[0044] The selection of main components is shown in Table 1. The selected components and performance parameters are as follows:

[0045] Table 1 Performance parameters of main components

[0046]

[0047] (1) Power amplifier: The first amplifier uses the power amplifier F280 developed by Nanjing Guobo Electronics Co., Ltd., with a frequency band range of 0.4 to 4 GHz, a maximum input power of 27 dBm, a gain of 17 dB, an operating current of 150 mA, a control current of 7 mA, and a size of 3.0 × 3.0 mm.

[0048] (2) RF switch 1: The first RF switch and the second RF switch are WS7872DA-6 / TR produced by Shanghai Will Semiconductor Co., Ltd., with a frequency range of 0.1 to 6 GHz, an insertion loss of 0.55 dB, a switching time of 0.28 μs, and a size of 1.0×1.0×0.50 mm.

[0049] (3) RF switch 2: The third RF switch is WS7872DE-6 / TR from Shanghai Will Semiconductor Co., Ltd., with a frequency range of 0.1 to 7.125 GHz, an insertion loss of 0.5 dB, a switching time of 0.28 μs, and a size of 1.0 × 1.0 × 0.55 mm.

[0050] (4) Low noise amplifier: The second amplifier uses the low noise amplifier MXDLN16TL produced by Jiangsu Zhuosheng Microelectronics Co., Ltd., with a center frequency of 1575.42 MHz, a noise figure of 0.7 dB, an operating current of 0.8 mA, and a size of 1.1×0.7×0.45 mm.

[0051] (5) SAW filter: The first filter uses the surface acoustic waveguide filter SK3700S produced by Shanghai Mingtai Technology Co., Ltd. The operating frequency band is ISM, the center frequency is 2.45 GHz, the insertion loss is 1.5 dB, the out-of-band suppression is greater than 20 dB, and the size is 1.1×0.9×0.5 mm.

[0052] (6) Duplexer: The first duplexer is SLFT21-2R450G-07T produced by Shenzhen Sunlord Electronics Co., Ltd., which has a low-band port of 1560-1606 MHz and an insertion loss of 0.6 dB, and a mid-band port of 2400-2500 MHz and an insertion loss of 0.8 dB.

[0053] (7) Interface spring clips: The first and second interface spring clips are 818011460 produced by Dianlian Precision Technology Co., Ltd., with an insertion loss of 0.5 dB and a size of 1.8×1.0×1.0 mm.

[0054] (8) Matching components: The circuit components use resistors, capacitors and inductors in 0201 and 0402 packages with dimensions of 0.6×0.3mm or 1.0×0.5mm.

[0055] The timing of a miniaturized, low-latency, multi-communication link fusion RF circuit is:

[0056] Figure 7 The following is a timing diagram of multi-channel trigger enable for the traditional switch module architecture and the fusion architecture. In the traditional switch module architecture, during the entire device polling cycle T, the LORA / NBIOT / GNSS / WIFI / BLE multi-channels are turned on in sequence through switch switching to complete signal transmission. Among them, the trigger signal duration is much shorter than the channel opening time.

[0057] In the present invention, a fusion architecture is adopted. During the entire device polling cycle T, the LORA receiving and transmitting channels and the NB channel complete the time division multiplexing and frequency division multiplexing transmission of the three-way signal through the switch switching method. At the same time, the BLE and WIFI channels complete the time division multiplexing of the two-way signal through the switch switching method, and the BLE / WIFI channel and the GNSS channel complete the frequency division multiplexing of the three-way signal through filters, power dividers and dual-frequency antennas. Compared with the traditional switch module architecture, the multi-channel transmission delay of the fusion architecture is only 1 / 3 to 1 / 2 of the traditional multi-channel transmission delay.

[0058] like Figure 8 As shown, an antenna structure in a miniaturized, low-latency, multi-communication link fusion radio frequency circuit includes: a first dual-frequency antenna and a second dual-frequency antenna.

[0059] The first dual-frequency antenna and the second dual-frequency antenna both include a radiation unit, a feeder unit and a grounding unit, wherein the radiation unit radiates signals into space, the feeder unit is used to transmit signals and impedance matching, and the grounding unit enhances the antenna signal receiving capability and prevents electrostatic interference.

[0060] The first dual-band antenna and the second dual-band antenna both use laser direct structuring (LDS) technology to achieve antenna miniaturization and whole closed packaging. The measured antenna parameters are the parameter values ​​under the whole closed packaging:

[0061] like Fig. 9 As shown, the difference between the first dual-frequency antenna and the second dual-frequency antenna is that the first dual-frequency antenna covers two frequency bands of LORA / NBIOT channels, with center frequencies of 424MHz and 892MHz respectively, and return losses of -6.45dB and -7.28dB respectively; the second dual-frequency antenna covers two frequency bands of GNSS / WIFI / BLE channels, with center frequencies of 1582.5MHz and 2.45GHz respectively, and return losses of -22.68dB and -10dB respectively.

[0062] Fig.10 This is the E-plane gain diagram of the first dual-band antenna and the second dual-band antenna. The LORA / NBIOT channel antenna gains are 0.0847dB and 1.87dB respectively, and the GNSS / WIFI / BLE channel antenna gains are 1.03dB and 1.14dB respectively.

[0063] Fig.11 This is the H-plane gain diagram of the first dual-band antenna and the second dual-band antenna. The LORA / NBIOT channel antenna gains are -0.52dB and 1.51dB respectively, and the GNSS / WIFI / BLE channel antenna gains are 3.95dB and 5.7dB respectively.

[0064] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A miniaturized, low-latency, multi-communication link fusion radio frequency circuit, characterized in that: It includes a LORA transceiver circuit, an NBIOT transceiver circuit, a GNSS receiving circuit, a WIFI transceiver circuit, a BLE transceiver circuit, a first dual-frequency antenna and a second dual-frequency antenna; the LORA transceiver circuit and the NBIOT transceiver circuit adopt a circuit architecture combining a power amplifier, a switch module and a first dual-frequency antenna to achieve frequency division multiplexing, time division multiplexing and simultaneous same-frequency transmission of three-channel signals; the GNSS receiving circuit, the WIFI transceiver circuit and the BLE transceiver circuit adopt a circuit architecture combining a power amplifier, a switch module, a filter, a duplexer and a second dual-frequency antenna to achieve frequency division multiplexing, time division multiplexing and simultaneous same-frequency transmission of three-channel signals.

2. The radio frequency circuit for fusion of multiple communication links according to claim 1, characterized in that: In the LORA transceiver circuit: the LORA receiving RF interface, the first RF switch, the second RF switch, the first interface spring and the first dual-frequency antenna are connected in sequence and receive UHF low-frequency band non-network communication signals; the LORA sending RF interface, the first amplifier, the first RF switch, the second RF switch, the first interface spring and the first dual-frequency antenna are connected in sequence and send UHF low-frequency band non-network communication signals.

3. The radio frequency circuit for fusion of multiple communication links according to claim 1, characterized in that: In the NBIOT transceiver circuit: the NBIOT transceiver RF interface, the second RF switch, the first interface spring and the first dual-frequency antenna are connected in sequence to receive and send UHF low-frequency band Internet of Things communication signals.

4. The radio frequency circuit for fusion of multiple communication links according to claim 1, characterized in that: In the GNSS receiving circuit: the GNSS receiving radio frequency interface, the second amplifier, the first duplexer, the second interface spring and the second dual-frequency antenna are connected in sequence to receive Beidou positioning signals.

5. The radio frequency circuit for fusion of multiple communication links according to claim 1, characterized in that: In the WIFI transceiver circuit: the WIFI transceiver RF interface, the third RF switch, the first filter, the first duplexer, the second interface spring and the second dual-frequency antenna are connected in sequence to receive and send UHF high frequency band WIFI signals.

6. The radio frequency circuit for fusion of multiple communication links according to claim 1, characterized in that: In the BLE transceiver circuit, the BLE transceiver RF interface, the third RF switch, the first filter, the first duplexer, the second interface spring and the second dual-frequency antenna are connected in sequence to receive and send UHF high frequency band BLE signals.

7. The radio frequency circuit for fusion of multiple communication links according to claim 1, characterized in that: The trigger enable timing of each link channel is as follows: within the entire device polling cycle T, the LORA transmitting channel, receiving channel and NBIOT transceiver channel complete the time division multiplexing and frequency division multiplexing transmission of the three signals through the switch switching method; the BLE and WIFI channels complete the time division multiplexing of the two signals through the switch switching method, and the BLE / WIFI channel and the GNSS channel complete the frequency division multiplexing of the three signals through the first duplexer and the second dual-frequency antenna.

8. The radio frequency circuit for integrating multiple communication links according to claim 1, characterized in that: The first dual-frequency antenna and the second dual-frequency antenna both include a radiation unit, a feeder unit and a grounding unit; the radiation unit radiates signals into space, the feeder unit is used for transmitting signals and impedance matching, and the grounding unit is used to enhance the antenna signal receiving capability and prevent electrostatic interference.

9. The radio frequency circuit for integrating multiple communication links according to claim 8, characterized in that: The first dual-band antenna covers two frequency bands of LORA / NBIOT channels, with center frequencies of 424MHz and 892MHz respectively; the second dual-band antenna covers two frequency bands of GNSS / WIFI / BLE channels, with center frequencies of 1582.5MHz and 2.45GHz respectively.

10. The radio frequency circuit for integrating multiple communication links according to claim 1, characterized in that: The circuit is also provided with capacitors, inductors, and resistors; Used for filtering, DC isolation, voltage regulation, switch biasing and impedance matching.

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