Duplexer circuit for wireless communication

Abstract

The utility model provides a kind of circuit of wireless communication's duplexer, it is related to communication technical field, including first unit LC discrete device matching component, second unit LC discrete device matching component, third unit LC discrete device matching component, Band31 transmission filter, Band72 transmission filter, Band73 transmission filter, fourth unit LC discrete device matching component, fifth unit LC discrete device matching component, sixth unit LC discrete device matching component, seventh unit LC discrete device matching component and receiving filter, when signal transmission, through Band31, Band72 and Band73 three transmission paths to adapt the frequency band required by LTE 450MHz private network, when signal reception, through receiving filter and receive Band31, Band72 and Band73, to this end realize frequency division duplex, solve the problem that existing duplexer is not applicable to LTE 450MHz private network, the utility model is applicable to LTE 450MHz private network communication.

Description

Technical Field

[0001] This utility model relates to the field of communication technology, and in particular to the circuit of a duplexer for wireless communication. Background Technology

[0002] With its superior network coverage, low site density, and low deployment cost, as well as its support for voice functions, the LTE 450MHz private network has great potential in the M2M / IoT field. The frequency bands of the LTE 450MHz private network include Band31, Band72, and Band73 as defined in the 3GPP protocol, all of which operate in FDD (Frequency Division Duplex) duplex mode. Existing duplexer circuits are not suitable for the LTE 450MHz private network. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a circuit for a duplexer for wireless communication, which solves the problem that existing duplexers are not suitable for LTE 450MHz private networks.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a circuit for a duplexer for wireless communication, applied to a 4G / 5G communication module. The 4G / 5G communication module includes a power amplifier, an antenna switch, and an RF transceiver chip. The duplexer includes a first unit LC discrete device matching component, a second unit LC discrete device matching component, a third unit LC discrete device matching component, a Band31 transmit filter, a Band72 transmit filter, a Band73 transmit filter, a fourth unit LC discrete device matching component, a fifth unit LC discrete device matching component, a sixth unit LC discrete device matching component, a seventh unit LC discrete device matching component, and a receive filter. The first unit is an LC discrete device matching component used to match the impedance of the power amplifier output port and the Band31 emitter filter input port; The second unit, the LC discrete device matching component, is used to match the impedance of the power amplifier output port and the Band72 emitter filter input port. The third unit, the LC discrete component matching assembly, is used to match the impedance of the power amplifier output port and the Band73 emitter filter input port. The fourth unit, the LC discrete device matching assembly, is used to match the output port impedance of the Band31 transmit filter and increase the isolation between the Band31 transmit filter and the receive filter. The fifth unit, the LC discrete device matching assembly, is used to match the output port impedance of the Band72 transmit filter and increase the isolation between the Band72 transmit filter and the receive filter. The sixth unit, the LC discrete device matching assembly, is used to match the output port impedance of the Band73 transmit filter and increase the isolation between the Band73 transmit filter and the receive filter. One end of the seventh unit LC discrete device matching component is connected to the fourth unit LC discrete device matching component, the fifth unit LC discrete device matching component, the sixth unit LC discrete device matching component, and the receiving filter, respectively. The other end of the seventh unit LC discrete device matching component is connected to the antenna switch. The seventh unit LC discrete device matching component is used to complete the impedance convergence of the common terminal of Band31, Band72 and Band73, as well as harmonic suppression. The receiving filter is connected to the RF transceiver chip; The frequency range of the Band31 transmitting filter is 452.5MHz to 457.4MHz; the frequency range of the Band72 transmitting filter is 451MHz to 455.9MHz; the frequency range of the Band73 transmitting filter is 450MHz to 454.9MHz; and the frequency range of the receiving filter is 460MHz to 467.4MHz.

[0005] Furthermore, the fourth unit LC discrete device matching assembly, the fifth unit LC discrete device matching assembly, and the sixth unit LC discrete device matching assembly all include a first matching assembly and a second matching assembly. The first matching assembly is a π-type matching assembly or a T-type matching assembly, and the second matching assembly is a notch matching assembly.

[0006] The beneficial effects of this utility model are as follows: This utility model provides a circuit for a duplexer for wireless communication. When transmitting signals, it uses three transmission paths, Band31, Band72 and Band73, to adapt to the frequency band required by the LTE 450MHz private network. When receiving signals, it uses a receiving filter to receive Band31, Band72 and Band73, thereby realizing frequency division duplexing and solving the problem that existing duplexers are not suitable for LTE 450MHz private networks. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the circuit structure of a duplexer for wireless communication provided by this utility model; wherein, 10 represents the first unit LC discrete device matching component, 11 represents the second unit LC discrete device matching component, 12 represents the third unit LC discrete device matching component, 13 represents the Band31 transmit filter, 14 represents the Band72 transmit filter, 15 represents the Band73 transmit filter, 16 represents the fourth unit LC discrete device matching component, 17 represents the fifth unit LC discrete device matching component, 18 represents the sixth unit LC discrete device matching component, 19 represents the seventh unit LC discrete device matching component, and 20 represents the receive filter. Detailed Implementation

[0008] This invention addresses the problem that existing duplexers are not suitable for LTE 450MHz private networks by providing a circuit for a wireless communication duplexer applied to 4G / 5G communication modules. The 4G / 5G communication module includes a power amplifier, an antenna switch, and an RF transceiver chip. The duplexer is described as follows: Figure 1 As shown, it includes a first unit LC discrete device matching assembly 10, a second unit LC discrete device matching assembly 11, a third unit LC discrete device matching assembly 12, a Band 31 transmit filter 13, a Band 72 transmit filter 14, a Band 73 transmit filter 15, a fourth unit LC discrete device matching assembly 16, a fifth unit LC discrete device matching assembly 17, a sixth unit LC discrete device matching assembly 18, a seventh unit LC discrete device matching assembly 19, and a receive filter 20; The first unit LC discrete device matching component 10 is used to match the impedance of the power amplifier output port and the Band31 emitter filter 13 input port; The second unit, LC discrete device matching component 11, is used to match the impedance of the power amplifier output port and the Band72 emitter filter 14 input port; The third unit, LC discrete device matching component 12, is used to match the impedance of the power amplifier output port and the Band73 emitter filter 15 input port; The fourth unit, LC discrete device matching component 16, is used to match the output port impedance of the Band31 transmit filter 13 and increase the isolation between the Band31 transmit filter 13 and the receive filter 20. The fifth unit, LC discrete device matching component 17, is used to match the output port impedance of the Band72 transmit filter 14 and increase the isolation between the Band72 transmit filter 14 and the receive filter 20. The sixth unit LC discrete device matching component 18 is used to match the output port impedance of the Band73 transmit filter 15 and increase the isolation between the Band73 transmit filter 15 and the receive filter 20. One end of the seventh unit LC discrete device matching component 19 is connected to the fourth unit LC discrete device matching component 16, the fifth unit LC discrete device matching component 17, the sixth unit LC discrete device matching component 18, and the receiving filter 20, respectively. The other end of the seventh unit LC discrete device matching component 19 is connected to the antenna switch. The seventh unit LC discrete device matching component 19 is used to complete the impedance convergence of the common terminal of Band31, Band72 and Band73, as well as harmonic suppression. The receiving filter 20 is connected to the radio frequency transceiver chip; The frequency range of the Band31 transmitting filter 13 is 452.5MHz to 457.4MHz; the frequency range of the Band72 transmitting filter 14 is 451MHz to 455.9MHz; the frequency range of the Band73 transmitting filter 15 is 450MHz to 454.9MHz; and the frequency range of the receiving filter 20 is 460MHz to 467.4MHz.

[0009] Furthermore, the fourth unit LC discrete device matching assembly, the fifth unit LC discrete device matching assembly, and the sixth unit LC discrete device matching assembly all include a first matching assembly and a second matching assembly. The first matching assembly is a π-type matching assembly or a T-type matching assembly, and the second matching assembly is a notch matching assembly.

[0010] Specifically, the parameters of the matching components for each LC discrete device are verified and debugged through simulation to improve the performance of signal transmission and reception. The π-type matching component consists of two parallel capacitors and one series inductor, the T-type matching component consists of two series inductors and one parallel capacitor, and the notch matching component is a series resonance of capacitor and inductor.

[0011] The working principle of a duplexer circuit for wireless communication: Band31 Transmit Path: The Band31 TX output from the power amplifier passes sequentially through the first unit LC discrete component matching assembly 10, the Band31 transmit filter 13, the fourth unit LC discrete component matching assembly 16, the seventh unit LC discrete component matching assembly 19, and the antenna switch to reach the transmit antenna, i.e., the Band31 ANT, completing the signal transmission. Since the frequency range of the receive filter 20 is 460MHz to 467.4MHz, the Band31 TX will not enter the receiver.

[0012] The Band72 transmit path: The Band72 TX output from the power amplifier passes sequentially through the second unit LC discrete component matching assembly 11, the Band72 transmit filter 14, the fifth unit LC discrete component matching assembly 17, the seventh unit LC discrete component matching assembly 19, and the antenna switch to reach the transmit antenna, i.e., the Band72 ANT, completing the signal transmission. Since the frequency range of the receive filter 20 is 460MHz to 467.4MHz, the Band72 TX will not enter the receiver.

[0013] The Band73 transmit path: The Band73 TX output from the power amplifier passes sequentially through the third unit LC discrete component matching assembly 12, the Band73 transmit filter 15, the sixth unit LC discrete component matching assembly 18, the seventh unit LC discrete component matching assembly 19, and the antenna switch to reach the transmit antenna, i.e., the Band73 ANT, completing the signal transmission. Since the frequency range of the receive filter 20 is 460MHz to 467.4MHz, the Band73 TX will not enter the receiver.

[0014] Receive path: The downlink signal Band31 ANT, Band72 ANT or Band73 ANT passes through the seventh unit LC discrete device matching component 19 and the receive filter 20, and becomes Band31RX, Band72 RX or Band73 RX, which arrives at the RF transceiver chip to complete the signal reception.

Claims

1. A circuit for a duplexer in wireless communication, applied in a 4G / 5G communication module, the 4G / 5G communication module comprising a power amplifier, an antenna switch, and a radio frequency transceiver chip, characterized in that, The duplexer includes a first unit LC discrete device matching assembly, a second unit LC discrete device matching assembly, a third unit LC discrete device matching assembly, a Band31 transmit filter, a Band72 transmit filter, a Band73 transmit filter, a fourth unit LC discrete device matching assembly, a fifth unit LC discrete device matching assembly, a sixth unit LC discrete device matching assembly, a seventh unit LC discrete device matching assembly, and a receive filter. The first unit is an LC discrete device matching component used to match the impedance of the power amplifier output port and the Band31 emitter filter input port; The second unit, the LC discrete device matching component, is used to match the impedance of the power amplifier output port and the Band72 emitter filter input port. The third unit, the LC discrete component matching assembly, is used to match the impedance of the power amplifier output port and the Band73 emitter filter input port. The fourth unit, the LC discrete device matching assembly, is used to match the output port impedance of the Band31 transmit filter and increase the isolation between the Band31 transmit filter and the receive filter. The fifth unit, the LC discrete device matching assembly, is used to match the output port impedance of the Band72 transmit filter and increase the isolation between the Band72 transmit filter and the receive filter. The sixth unit, the LC discrete device matching assembly, is used to match the output port impedance of the Band73 transmit filter and increase the isolation between the Band73 transmit filter and the receive filter. One end of the seventh unit LC discrete device matching component is connected to the fourth unit LC discrete device matching component, the fifth unit LC discrete device matching component, the sixth unit LC discrete device matching component, and the receiving filter, respectively. The other end of the seventh unit LC discrete device matching component is connected to the antenna switch. The seventh unit LC discrete device matching component is used to complete the impedance convergence of the common terminal of Band31, Band72 and Band73, as well as harmonic suppression. The receiving filter is connected to the RF transceiver chip; The frequency range of the Band31 transmitting filter is 452.5MHz to 457.4MHz; the frequency range of the Band72 transmitting filter is 451MHz to 455.9MHz; the frequency range of the Band73 transmitting filter is 450MHz to 454.9MHz; and the frequency range of the receiving filter is 460MHz to 467.4MHz.

2. The circuit of the duplexer for wireless communication according to claim 1, characterized in that, The fourth unit LC discrete device matching assembly, the fifth unit LC discrete device matching assembly, and the sixth unit LC discrete device matching assembly all include a first matching assembly and a second matching assembly. The first matching assembly is a π-type matching assembly or a T-type matching assembly, and the second matching assembly is a notch matching assembly.

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