Star junction type multiplexer device

Abstract

The utility model provides a star junction type multiplexer device. An ST interface is a Tiantong radio frequency transmitting link signal input port, and an SR interface is a Tiantong radio frequency receiving link signal output port; the BD interface is a Beidou B1B3 radio frequency signal output port, and the RF interface is an all-in-one input and output port and comprises antenna power supply output, Tiantong radio frequency transmitting link output, serial port control signal output, Tiantong radio frequency receiving link input, Beidou B1B3 radio frequency signal input and serial port receiving signal input; the KZ interface is a control port and comprises power input, control signal input and serial port signal input and output; the host sends a parameter query and setting instruction to the multiplexer device through a serial port, the multiplexer device converts a serial port sending digital signal TRTXIN into a modulation signal RFTR2 MHz and sends the modulation signal RFTR2 MHz to the antenna, the antenna firstly demodulates the modulation signal into a serial port receiving digital signal, the serial port receiving digital signal is converted into the modulation signal RFTR2 MHz after being processed by the MCU and sent to the multiplexer device, and the multiplexer device sends the modulation signal RFTR2 MHz to the MCU. And the multiplexer device converts the digital signal TRRXIN into a serial port receiving digital signal TRRXIN and then sends the digital signal TRRXIN to the mainboard.

Description

Technical Field

[0001] The utility model relates to a telescopic pipeline and a fire extinguishing nozzle. Background Art

[0002] The Tiantong portable terminal consists of a host and an antenna. When in use, the antenna needs to be placed outdoors and the host indoors. The host and the antenna are connected by a radio frequency line of more than 10 meters. There are DC power supplies, serial port transceiver signals, Beidou B1B3 frequency radio frequency receiving signals, Tiantong receiving channel radio frequency signals, and Tiantong transmitting channel radio frequency signals between the host and the portable antenna. Only by using a suitable multiplexer can the equipment be miniaturized, lightweight, have a low bit error rate, low cost, and be easy and quick to use.

[0003] Most of the multiplexers used between the Tiantong portable terminal host and antenna on the market are hybrid bridge coupling multiplexers.

[0004] Each channel of the hybrid bridge coupled multiplexer is composed of two identical filters and two identical 90° hybrid bridges. It is large in size, prone to phase deviation, and difficult to process, which will cause problems in the size, weight, bit error rate, cost, and usage of the Tiantong portable terminal. Utility Model Content

[0005] The main technical problem to be solved by the utility model is to provide a star-junction multiplexer device, which reduces the size of the multiplexer, reduces the processing difficulty, and ensures the signal quality, thereby reducing the size and weight of the Tiantong portable terminal, reducing the communication bit error rate, improving the communication quality, and reducing the production cost.

[0006] In order to solve the above technical problems, the utility model provides a star-junction multiplexer device, wherein the multiplexer device has an ST interface, an SR interface, a BD interface, an RF interface, and a KZ interface;

[0007] The ST interface is the Tiantong RF transmission link signal input port, and the SR interface is the Tiantong RF reception link signal output port; the BD interface is the Beidou B1 B3 RF signal output port, and the RF interface is an all-in-one input and output port, including antenna power output, Tiantong RF transmission link output, serial port control signal output, Tiantong RF reception link input, Beidou B1B3 RF signal input, and serial port reception signal input; the KZ interface is a control port, including power input, control signal input, and serial port signal input and output;

[0008] After the antenna is powered on, the host sends parameter query and setting instructions to the multiplexer device through the serial port. The multiplexer device converts the serial port digital signal TR_TX IN into a modulated signal RF_TR_2MHz and sends it to the antenna. The antenna first demodulates the modulated signal into a serial port received digital signal, and after being processed by the MCU, it is converted into a modulated signal RF_TR_2MHz and sent to the multiplexer device. The multiplexer device then converts it into a serial port received digital signal TR_RXI N and sends it to the mainboard.

[0009] In a preferred embodiment: the multiplexer device also includes a transceiver integrated with AI SG, model SN65HVD62.

[0010] In a preferred embodiment: the multiplexer device further includes a CMOS analog switch, model number ADG812.

[0011] In a preferred embodiment: the low-pass filter of the multiplexer device is of LFCN series.

[0012] In a preferred embodiment: the high pass filter of the multiplexer device is of HFCN series.

[0013] In a preferred embodiment: the bandpass filter of the multiplexer device is of SBP series.

[0014] In a preferred embodiment: the bandpass filter amplifier of the multiplexer device is SPF-5043Z.

[0015] In a preferred embodiment: the serial port modulation signal transceiver of the multiplexer device is SN65HVD62.

[0016] In a preferred embodiment: the digital signal and radio frequency signal isolator of the multiplexer device is ADG812.

[0017] The utility model provides a star-junction multiplexer device, which can eliminate the need for too many identical filters and hybrid bridges by cooperating a series of filters, amplifiers, and power dividers on each path, and then adding corresponding metal isolation cavities to isolate and shield each path, thereby reducing the size of the multiplexer, reducing the difficulty of processing, and ensuring signal quality, thereby reducing the size and weight of the Tiantong portable terminal, reducing the communication bit error rate, improving the communication quality, and reducing the manufacturing cost. At the same time, by enabling the signal to accurately control the working state of each radio frequency path, the power consumption of the Tiantong portable terminal is further reduced, and the standby time is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a module diagram of a preferred embodiment of the utility model;

[0019] Figure 2 This is a circuit diagram of the KZ interface in the preferred embodiment of the utility model;

[0020] Figure 3 A circuit diagram of serial port signal conversion in a preferred embodiment of the utility model;

[0021] Figure 4 This is a multi-channel signal coupling circuit diagram in a preferred embodiment of the utility model;

[0022] Figure 5 This is a circuit diagram for isolating digital signals from radio frequency signals in a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0026] refer to Figure 1-Figure 5 , this embodiment provides a star-junction multiplexer device, the multiplexer device having an ST interface, an SR interface, a BD interface, an RF interface, and a KZ interface;

[0027] The ST interface is the Tiantong RF transmission link signal input port, and the SR interface is the Tiantong RF reception link signal output port; the BD interface is the Beidou B1 B3 RF signal output port, and the RF interface is an all-in-one input and output port, including antenna power output, Tiantong RF transmission link output, serial port control signal output, Tiantong RF reception link input, Beidou B1B3 RF signal input, and serial port reception signal input; the KZ interface is a control port, including power input, control signal input, and serial port signal input and output;

[0028] After the antenna is powered on, the host sends parameter query and setting instructions to the multiplexer device through the serial port. The multiplexer device converts the serial port digital signal TR_TX IN into a modulated signal RF_TR_2MHz and sends it to the antenna. The antenna first demodulates the modulated signal into a serial port received digital signal, and after being processed by the MCU, it is converted into a modulated signal RF_TR_2MHz and sent to the multiplexer device. The multiplexer device then converts it into a serial port received digital signal TR_RXI N and sends it to the mainboard.

[0029] The connection relationship between the mainboard, power circuit, multiplexer and antenna of Tiantong portable terminal is shown in Figure 1 The mainboard provides a 3.3V operating voltage for the multiplexer, and the power circuit provides a DC operating voltage for the antenna through the multiplexer device, and the multiplexer device starts working.

[0030] The circuit diagram of KZ interface is shown in Figure 2 , the interface pins are defined as follows:

[0031] KZ Interface Pin Definition

[0032]

[0033] See the schematic diagram of multiplexer serial port signal conversion Figure 3 The SN65HVD62 in the figure is a transceiver integrated with AI SG. It adopts half-duplex communication mode and has modulation and demodulation functions. The serial port baud rate can reach 115kbps. It can modulate and demodulate the serial port digital signal with the RF signal with a center frequency of 2.176MHz. It is compatible with the antenna interface standard group V2.0 specification. It has a built-in integrated active bandpass filter with a center frequency of 2.176MHz, which can still demodulate the signal when parasitic frequency components appear.

[0034] The antenna DC working voltage VCC_ANT and the serial port modulation signal RF_TR_2MHz are coupled with the Beidou B1 B3 frequency point RF signal RF_BD, the Tiantong transmission channel RF signal S-Tx, and the Tiantong receiving channel RF signal S-Rx through capacitors, inductors, filters and other devices to form a path. See the circuit schematic diagram. Figure 4 .

[0035] ① At the common connection point of RF interface J3, inductor L4 and capacitor C16, the multi-channel signal synthesis path will be divided into a DC path and an RF path; at the common connection point of resistor R37, resistor R39, inductor L6 and capacitor C9, the RF path will be divided into the Tiantong RF transmission and reception path and the Beidou B1 B3 frequency RF reception and serial port modulation signal path; at the common connection point of inductor L7, capacitor C19 and capacitor C28, the Beidou B1 B3 frequency RF reception and serial port modulation signal path will be divided into the Beidou B1 B3 frequency RF reception path and the serial port modulation signal transceiver path; the Tiantong RF transmission and reception path will be divided into the Tiantong RF transmission path and the Tiantong RF reception path through the power divider N4.

[0036] ② In the DC path, the DC voltage VCC_ANT is coupled to the RF interface J3 for external output after passing through the low-pass filter composed of inductor L4 and capacitor C17 and the low-pass filter composed of inductor L5 and capacitor C24. At the same time, the DC signal is isolated from the serial port modulation signal, Beidou B1 B3 RF signal, Tiantong transmission link RF signal and Tiantong receiving link RF signal through capacitor C16.

[0037] ③ In the serial modulated signal receiving and sending path, because the serial signal modem U2 adopts half-duplex communication mode, the sending and receiving of the serial modulated signal are carried out in time division. When the mainboard sends a serial command, the serial digital signal is first sent to the serial modem U2. U2 modulates the serial digital signal into an analog signal and then passes through the LC low-pass filter composed of inductors L10, L11 and capacitors C30, C31, C32, and C33, and then passes through the ceramic low-pass filter Z12, Z11 and capacitor C28 and is synthesized with the Beidou B1 B3 frequency point RF signal into a RF signal. Then it passes through the low-pass filter composed of inductor L7 and capacitor C26, the ceramic low-pass filter Z7, the ceramic low-pass filter Z6, and the low-pass filter composed of inductor L6 and capacitor C25, and then passes through the π-type attenuator used to adjust the signal amplitude to reach the DC blocking capacitor C16, and finally passes through the capacitor C16 to reach the RF interface J3 for external output. The received signal is the reverse process of the sent signal.

[0038] ④ In the Beidou B1 B3 RF signal receiving path, the Beidou B1 B3 RF signal is first received from the RF interface J3, passes through the DC blocking capacitor C16 and the π-type attenuator used to adjust the signal amplitude, and then passes through the low-pass filter composed of inductor L6 and capacitor C25, ceramic low-pass filter Z6, ceramic low-pass filter Z7, low-pass filter composed of inductor L7 and capacitor C26, high-pass filter composed of inductor L8 and capacitor C19, ceramic high-pass filter Z8, ceramic low-pass filter Z9, ceramic low-pass filter Z10, ceramic low-pass filter Z7, power divider N4 to reach the BD interface J4, and finally the BD interface is output to the Beidou receiving module on the mainboard.

[0039] ⑤ In the Tiantong RF receiving path, the Tiantong RF receiving signal is received from the RF interface J3, passes through the DC blocking capacitor C16 and the π-type attenuator used to adjust the signal amplitude, and then passes through the low-pass filter composed of inductor L3 and capacitor C9, ceramic high-pass filter Z2, power divider N2, band-pass filter Z3, RF signal amplifier N3, band-pass filter Z4, band-pass filter Z5, resistors R3, R6 and R7 to form a π-type attenuator and reach the SR interface J2, and finally the SR interface outputs to the baseband module on the mainboard.

[0040] ⑥ In the Tiantong RF transmission path, the Tiantong RF transmission signal generated by the baseband module on the mainboard will be sent in from the ST interface J1, and pass through the RF signal amplifier N1, the bandpass filter Z1, the power divider N2, the ceramic high-pass filter Z2, the low-pass filter composed of the inductor L3 and the capacitor C9 in turn, and then pass through the π-type attenuator used to adjust the signal amplitude to reach the DC blocking capacitor C16, and finally pass through the capacitor C16 to reach the RF interface J3 for external output.

[0041] By having a series of filters, amplifiers, and power dividers on each channel working in coordination with each other and adding corresponding metal isolation cavities to isolate and shield each channel, we can ensure the isolation between each channel so that the signals on the channels do not interfere with each other, and ensure that the signal gain on each channel is not affected, thereby ensuring the quality of the transmitted signal.

[0042] At the same time, in order to reduce the mutual interference between digital signals and RF signals, U3 ADG812 is added to isolate digital signals and RF signals. See the circuit schematic diagram. Figure 5 .

[0043] ADG812 integrates 4 independently controlled COMS analog switches, with input and output isolation of more than 67dB, switch switching response time of less than 25ns, and output current of each channel of more than 300mA, which greatly enhances the driving capability of RF amplifiers N1, N3 and transceiver U2. When the enable signal TR_EN, STx_EN or SRx_EN is high, 3.3V_TR, 3.3V_STx, 3.3V_SRx will output high level (3.3V) correspondingly, and the serial port modulation signal transceiver channel, Tiantong RF transmission channel, and Tiantong RF receiving channel will be opened accordingly; when the enable signal TR_EN, STx_EN or SRx_EN is low, 3.3V_TR, 3.3V_STx, 3.3V_SRx will output low level (0V) correspondingly, and the serial port modulation signal transceiver channel, Tiantong RF transmission channel, and Tiantong RF receiving channel will be closed accordingly. The operating state of each RF path is precisely controlled by enabling signals TR_EN, STx_EN, and SRx_EN, further reducing the power consumption of the multiplexer.

[0044] Therefore, through such a multiplexer device, there is no need for too many identical filters and hybrid bridges, which not only reduces the size of the multiplexer and the processing difficulty, but also ensures the signal quality, thereby reducing the size and weight of the Tiantong portable terminal, reducing the communication bit error rate, improving the communication quality, and reducing the production cost.

[0045] In this embodiment, the low-pass filter of the multiplexer circuit is LFCN series, the high-pass filter is HFCN series, the band-pass filter is SBP series, the amplifier is SPF-5043Z, the serial port modulation signal transceiver is SN65HVD62, and the digital signal and RF signal isolator is ADG812;

[0046] The external input and output RF interface of the multiplexer circuit is a standard MCX-KYD port, the digital signal and power interface is a 2.0mm pitch 2×10 double-row double plastic pin, the pin length is 15mm, the logic level is 3.3V TTL level, the power supply voltage is 3.3V, and the input feed voltage is one of 30.2V, 31.1V or 36V;

[0047] The mainboard is a mainboard of the Tiantong portable terminal, which has the functions of amplifying and demodulating Tiantong RF receiving signals, modulating and sending Tiantong baseband signals, and demodulating Beidou B1 B3 frequency RF signals, and supports 3.3V TTL level serial port transceiver and other logic level control and detection functions;

[0048] The antenna is a Tiantong portable terminal flat-panel antenna, which has the functions of Tiantong RF receiving signal low-noise amplification, Tiantong RF transmitting signal amplification and Beidou B1 B3 frequency RF signal amplification, supports serial port modulated signal reception, demodulation, protocol processing, and supports serial port digital signal modulation and transmission.

[0049] The multiplexer device can effectively separate the Tiantong RF receiving signal (frequency range: 2170MHz~2200MHz), Beidou B1 B3 frequency RF receiving signal (frequency range: 1575.42MHz±16.368MHz, 1268.52MHz±10.23MHz), and serial port modulation signal (center frequency: 2.176MHz) from the multi-channel synthetic signal; the multiplexer circuit can combine the DC voltage (30.2V, 31.1V or 36V), Tiantong RF transmitting signal (frequency range: 1980MHz~2010MHz), and serial port modulation signal (center frequency: 2.176MHz) into one signal; the multiplexer circuit can modulate and demodulate the serial port signal, and receive and transmit it; the multiplexer circuit has the function of isolating digital signals from RF signals; the multiplexer circuit can respond to the logic control of external input;

[0050] When the TR_EN enable signal is high, the serial port modulation signal receiving and sending path is open, otherwise it is closed;

[0051] When the STx_EN enable signal is high, the Tiantong RF transmission path is turned on, otherwise it is turned off;

[0052] When the SRx_EN enable signal is high, the Tiantong RF receiving path is turned on, otherwise it is turned off.

[0053] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.

Claims

1. A star junction multiplexer device, characterized in that: The multiplexer device has an ST interface, an SR interface, a BD interface, an RF interface, and a KZ interface; The ST interface is the Tiantong RF transmission link signal input port, and the SR interface is the Tiantong RF reception link signal output port; the BD interface is the Beidou B1 B3 RF signal output port, and the RF interface is an all-in-one input and output port, including antenna power output, Tiantong RF transmission link output, serial port control signal output, Tiantong RF reception link input, Beidou B1 B3 RF signal input, and serial port reception signal input; the KZ interface is a control port, including power input, control signal input, and serial port signal input and output; After the antenna is powered on, the host sends parameter query and setting instructions to the multiplexer device through the serial port. The multiplexer device converts the serial port digital signal TR_TXIN into a modulated signal RF_TR_2MHz and sends it to the antenna. The antenna first demodulates the modulated signal into a serial port received digital signal, and after being processed by the MCU, it is converted into a modulated signal RF_TR_2MHz and sent to the multiplexer device. The multiplexer device then converts it into a serial port received digital signal TR_RXIN and sends it to the mainboard.

2. A star junction multiplexer device according to claim 1, characterized in that: The multiplexer device also includes an AISG-integrated transceiver, model SN65HVD62.

3. A star junction multiplexer device according to claim 1, characterized in that: The multiplexer device further comprises a CMOS analog switch, model number ADG812.

4. A star junction multiplexer device according to claim 1, characterized in that: The low-pass filter of the multiplexer device is of the LFCN series.

5. A star junction multiplexer device according to claim 1, characterized in that: The high pass filter of the multiplexer device is of HFCN series.

6. A star junction multiplexer device according to claim 1, characterized in that: The bandpass filter of the multiplexer device is of SBP series.

7. A star junction multiplexer device according to claim 1, characterized in that: The bandpass filter amplifier of the multiplexer device is SPF-5043Z.

8. The star junction multiplexer device according to claim 1, characterized in that: The serial port modulation signal transceiver of the multiplexer device is SN65HVD62.

9. The star junction multiplexer device according to claim 1, characterized in that: The digital signal and radio frequency signal isolator of the multiplexer device is ADG812.

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