CN115225109B - Terahertz frequency division duplex I/Q modulation-demodulation transceiving front end - Google Patents
Terahertz frequency division duplex I/Q modulation-demodulation transceiving front end Download PDFInfo
- Publication number
- CN115225109B CN115225109B CN202211144102.1A CN202211144102A CN115225109B CN 115225109 B CN115225109 B CN 115225109B CN 202211144102 A CN202211144102 A CN 202211144102A CN 115225109 B CN115225109 B CN 115225109B
- Authority
- CN
- China
- Prior art keywords
- frequency
- path
- receiving end
- port
- local oscillator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/90—Non-optical transmission systems, e.g. transmission systems employing non-photonic corpuscular radiation
Abstract
The invention provides a terahertz frequency division duplex I/Q modulation-demodulation transceiving front end, and relates to the technical field of terahertz wireless communication. The technical problems of high system complexity, high debugging difficulty and point-to-point one-way communication existing in the existing terahertz communication transceiving front end are solved. The invention comprises a transmitting end and a receiving end. The transmitting end and the receiving end respectively comprise a coupling unit, a filtering unit and a frequency mixing unit which are connected in sequence; the coupling unit of the transmitting end is connected with the coupling unit of the receiving end; the working frequency of the filtering unit at the receiving end is positioned in the stop band of the working frequency of the filtering unit at the transmitting end. The invention can reduce the complexity of system links, realize the miniaturization of the terahertz transceiving front-end link and realize terahertz full duplex communication.
Description
Technical Field
The invention relates to the technical field of terahertz wireless communication, in particular to a terahertz frequency division duplex I/Q modulation-demodulation transceiving front end.
Background
The terahertz wave is an electromagnetic wave with the frequency of 100GHz to 10THz, is located at a special position between millimeter waves and optical waves, and has the advantages of large bandwidth, high safety, strong directivity and the like. With the explosive growth of global mobile data traffic, the traditional microwave and millimeter wave frequency band is increasingly crowded, and new spectrum resources are urgently needed to be developed. On the other hand, a great amount of spectrum resources yet to be developed exist in the terahertz frequency band, and the terahertz frequency band has ultrahigh-speed wireless communication potential. Therefore, the terahertz communication technology has received much attention as one of ideal choices for the next-generation communication technology.
The terahertz communication transceiving front end reported at present is mostly based on a traditional superheterodyne communication system. The intermediate frequency signal under the system generally needs two or even multiple frequency conversion to reach the terahertz frequency band, so that the problems of high system complexity, high debugging difficulty and the like are caused. Meanwhile, in order to avoid interference of image sidebands on signals after up-conversion of the balanced mixer, an image rejection filter is required to filter the image sidebands in the conventional superheterodyne system, and the size and the cost of the system are further increased. On the other hand, the currently reported Solid-State terahertz communication systems Based on electronics, such as [ H.Hamada, T.Tsutsumi, H.Matsuzakki, et al, 300-GHz-Band 120-Gb/s Wireless Front-End Based on Inp-HEMT PAs and Mixers [ J ]. IEEE Journal of Solid-State Circuits, 2020, 55 (9): 2316-2335], are point-to-point unidirectional communications, which greatly limits the application and development of terahertz Wireless communication.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a terahertz frequency division duplex I/Q modulation-demodulation transceiving front end aiming at the technical problems of high system complexity, high debugging difficulty and point-to-point unidirectional communication of the existing terahertz communication transceiving front end.
The technical scheme adopted by the invention for solving the technical problem is as follows: a terahertz frequency division duplex I/Q modulation-demodulation transceiving front end comprises a transmitting end and a receiving end; the transmitting end and the receiving end respectively comprise a coupling unit, a filtering unit and a frequency mixing unit which are connected in sequence; the coupling unit of the transmitting end is connected with the coupling unit of the receiving end; the working frequency of the filtering unit of the receiving end is positioned in a stop band of the working frequency of the filtering unit of the transmitting end; the frequency mixing unit of the transmitting end is used for modulating the input two paths of intermediate frequency signals I and Q into two paths of terahertz signals I and Q, and the coupling unit of the transmitting end is used for synthesizing the two paths of terahertz signals I and Q into a single path of terahertz signal; the coupling unit of the receiving end is used for separating the received one-way terahertz signal into two paths of terahertz signals I and Q, and the mixing unit of the receiving end is used for modulating the two paths of terahertz signals I and Q into two paths of intermediate frequency signals I and Q.
Preferably, the two frequency mixing units each include an I-path frequency mixing module and a Q-path frequency mixing module; the I-path mixing module and the Q-path mixing module respectively comprise a radio frequency input port, a radio frequency probe, a Schottky diode pair, a local oscillator filter, a local oscillator input port, a local oscillator intermediate frequency duplexer, an intermediate frequency filter and an intermediate frequency output port; the radio frequency probe, the Schottky diode pair, the local oscillator filter, the local oscillator intermediate frequency duplexer and the intermediate frequency filter are sequentially connected; radio frequency input port sets up radio frequency probe department, local oscillator input port sets up local oscillator intermediate frequency duplexer department, intermediate frequency output port sets up intermediate frequency filter department.
Preferably, the two schottky diodes of the schottky diode pair are connected in anti-parallel.
Preferably, the two filtering units each include an I-path filter and a Q-path filter; the input end of the I-path filter of the transmitting end is connected with the intermediate frequency output port of the I-path mixing module of the transmitting end, and the input end of the Q-path filter of the transmitting end is connected with the intermediate frequency output port of the Q-path mixing module of the transmitting end; the output end of the I-path filter of the receiving end is connected with the radio frequency input port of the I-path frequency mixing module of the receiving end, and the output end of the Q-path filter of the receiving end is connected with the radio frequency input port of the Q-path frequency mixing module of the receiving end.
Preferably, both of the coupling units comprise a coupler; the No. 3 port of the coupler of the transmitting end is connected with the output port of the I-path filter of the transmitting end, the No. 2 port of the coupler of the transmitting end is connected with the output port of the Q-path filter of the coupler of the transmitting end, and the No. 1 port of the coupler of the transmitting end is connected with the No. 4 port of the coupler of the receiving end; and the No. 2 port of the coupler of the receiving end is connected with the input port of the I-path filter of the receiving end, and the No. 3 port of the coupler of the receiving end is connected with the input port of the Q-path filter of the coupler of the receiving end.
Preferably, the transmitting terminal further includes a matching load, the matching load is used for absorbing the I-path terahertz signal of the transmitting terminal, and the matching load is connected to the port No. 4 of the coupler of the transmitting terminal.
Preferably, the receiving end further includes an antenna, the antenna is used for receiving or transmitting the terahertz signal, and the antenna is connected with the port 1 of the coupler of the receiving end.
Preferably, the transmitting end and the receiving end both further include a local oscillator power divider; the input ports of the two local oscillator power dividers are both used for accessing local oscillator input signals, and two output ports of the local oscillator power divider at the transmitting end are respectively connected with the local oscillator input port of the I-path frequency mixing module and the local oscillator input port of the Q-path frequency mixing module at the transmitting end; two output ports of the local oscillator power divider of the receiving end are respectively connected with a local oscillator input port of the I-path frequency mixing module and a local oscillator input port of the Q-path frequency mixing module of the receiving end.
Preferably, the transmitting end further includes a first baseband signal processing platform for inputting an intermediate frequency signal to the transmitting end, the first baseband signal processing platform is provided with two output ports, and the two output ports are respectively connected to the radio frequency input port of the I-path frequency mixing module and the radio frequency input port of the Q-path frequency mixing module of the transmitting end.
Preferably, the receiving end further includes a second baseband signal processing platform for processing the two paths of I and Q intermediate frequency signals of the frequency mixing unit frequency conversion of the receiving end, the second baseband signal processing platform is provided with two input ports, and the two input ports are respectively connected to the intermediate frequency output port of the I-path frequency mixing module and the intermediate frequency output port of the Q-path frequency mixing module of the receiving end.
One of the above technical solutions of the present invention has the following advantages or beneficial effects:
compared with the traditional terahertz communication system with a superheterodyne system, the terahertz communication system has the advantages that direct modulation and demodulation of two paths of terahertz signals I and Q are realized, the transmission of the intermediate frequency signal can be completed only through one-time frequency conversion, an image frequency suppression filter is not needed in a link, the system architecture is greatly simplified, the integration and miniaturization of the terahertz transmitting and receiving front end are facilitated, and meanwhile, the circuit debugging cost and the processing cost are reduced. Moreover, the invention realizes the terahertz frequency division duplex communication.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a block diagram of a main structure of a terahertz frequency division duplex I/Q modulation-demodulation transceiving front end according to an embodiment of the present invention;
FIG. 2 is a block diagram of a terahertz frequency division duplex I/Q modulation-demodulation transceiving front-end system according to an embodiment of the present invention;
FIG. 3 is a perspective structural diagram of a coupler at the receiving end according to an embodiment of the present invention;
FIG. 4 is a diagram of the results of HFSS simulation of a coupler at the receiving end according to an embodiment of the invention;
FIG. 5 is a perspective view of a coupler at the transmitting end according to an embodiment of the present invention;
FIG. 6 is a diagram of the results of HFSS simulation of a coupler at the transmit end of an embodiment of the present invention;
FIG. 7 is a perspective view of a transmitter and receiver filter according to an embodiment of the present invention;
FIG. 8 is a diagram of HFSS simulation results for filters at the transmitting end and the receiving end according to an embodiment of the invention;
FIG. 9 is a block diagram of a mixer module according to an embodiment of the invention;
FIG. 10 shows simulation results of frequency conversion loss of the mixer module according to an embodiment of the invention;
fig. 11 is a perspective view of a local oscillator power divider according to an embodiment of the present invention;
fig. 12 is a diagram of HFSS simulation results of the local oscillator power divider according to the embodiment of the present invention.
1. A radio frequency input port; 2. a radio frequency probe; 3. a Schottky diode pair; 4. a local oscillation filter; 5. a local oscillator input port; 6. a local oscillator intermediate frequency duplexer; 7. an intermediate frequency filter; 8. and an intermediate frequency output port.
Detailed Description
In order that the objects, aspects and advantages of the present invention will become more apparent, various exemplary embodiments will be described below with reference to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary embodiments in which the invention may be practiced, unless otherwise indicated, and in which like numerals in different drawings represent the same or similar elements. The implementations described in the exemplary embodiments below do not represent all implementations consistent with the present disclosure. It is to be understood that they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims, and that other embodiments may be used, or structural and functional modifications may be made to the embodiments set forth herein, without departing from the scope and spirit of the present disclosure. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the described features.
The following embodiment is merely a specific example and does not indicate an implementation of the present invention as such.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
The first embodiment is as follows:
as shown in fig. 1-2, an embodiment of the present invention provides a terahertz frequency division duplex I/Q modulation-demodulation transceiving front end, which includes a transmitting end and a receiving end. The transmitting end and the receiving end respectively comprise a coupling unit, a filtering unit and a frequency mixing unit which are connected in sequence; the coupling unit of the transmitting end is connected with the coupling unit of the receiving end. Specifically, a frequency mixing unit at the transmitting end is used for modulating input two paths of intermediate frequency signals I and Q into two paths of terahertz signals I and Q, and a coupling unit at the transmitting end is used for synthesizing the two paths of terahertz signals I and Q into a single path of terahertz signal; the coupling unit of the receiving end is used for separating the received one-way terahertz signal into two paths of terahertz signals I and Q, and the mixing unit of the receiving end is used for modulating the two paths of terahertz signals I and Q into two paths of intermediate frequency signals I and Q; the filtering unit is used for filtering the I and Q terahertz signals. More specifically, the working frequency of the filtering unit of the receiving end is located in a stop band of the working frequency of the filtering unit of the transmitting end, so that the filtering unit of the receiving end can totally reflect the terahertz signal synthesized by the transmitting end and transmit the terahertz signal to a free space through the coupling unit of the receiving end, thereby realizing the isolation of the signal between the transmitting end and the receiving end and the terahertz frequency division duplex communication. Moreover, the working bandwidth of the coupling unit of the receiving end covers the working frequencies of the receiving end and the transmitting end, and the working bandwidth of the coupling unit of the transmitting end covers the working frequency of the transmitting end, so that the terahertz frequency division duplex communication is further realized.
Compared with a traditional super-heterodyne system terahertz communication system, the terahertz I and Q signals are directly modulated and demodulated, the intermediate frequency signals can be transmitted through one-time frequency conversion, an image frequency suppression filter is not needed in a link, the system architecture is greatly simplified, integration and miniaturization of the terahertz receiving and transmitting front end are facilitated, and meanwhile circuit debugging and processing costs are reduced. Moreover, the invention realizes the terahertz frequency division duplex communication.
As an optional implementation manner, each of the two frequency mixing units includes an I-path frequency mixing module and a Q-path frequency mixing module. As shown in fig. 9, the I-path mixing module and the Q-path mixing module both include a radio frequency input port 1, a radio frequency probe 2, a schottky diode pair 3, a local oscillator filter 4, a local oscillator input port 5, a local oscillator intermediate frequency duplexer 6, an intermediate frequency filter 7, and an intermediate frequency output port 8. Specifically, radio frequency probe 2, schottky diode pair 3, local oscillator filter 4, local oscillator intermediate frequency duplexer 6, intermediate frequency filter 7 connect gradually, and radio frequency input port 1 sets up in radio frequency probe 2 department, and local oscillator input port 5 sets up in local oscillator intermediate frequency duplexer 6 department, and intermediate frequency output port 8 sets up in intermediate frequency filter 7 department. It should be noted that the local oscillator filter 4 implements isolation between the radio frequency signal and the local oscillator signal, and the intermediate frequency filter 7 extracts the intermediate frequency signal and simultaneously implements isolation between the local oscillator signal and the intermediate frequency signal. Furthermore, the circuits of the two frequency mixing modules are made of quartz substrates, and the structures and the performances of the frequency mixing modules of the transmitting end and the receiving end can be completely the same.
Preferably, the two schottky diodes of the schottky diode pair 3 are connected in anti-parallel. It should be noted that, the two schottky diodes are connected in parallel in the reverse direction, so that odd harmonic components can be mutually offset, and second harmonic mixing is realized.
As an optional implementation manner, the two local power dividing units each include one local power divider. Specifically, the input ports of the two local oscillator power dividers are both used for accessing local oscillator input signals, and the two output ports of each local oscillator power divider are respectively connected to the local oscillator input port 5 of the I-path frequency mixing module and the local oscillator input port 5 of the Q-path frequency mixing module of the respective receiving and transmitting end. It should be noted that the local oscillator power divider of this embodiment adopts a wilkinson power divider circuit structure, and is configured to divide the local oscillator input signal power equally to drive two mixers at the transmitting end and the receiving end.
As an optional implementation manner, both the filtering units include an I-path filter and a Q-path filter. The input end of the I-path filter of the transmitting end is connected with the intermediate frequency output port 8 of the I-path mixing module of the transmitting end, and the input end of the Q-path filter of the transmitting end is connected with the intermediate frequency output port 8 of the Q-path mixing module of the transmitting end; the output end of the I-path filter of the receiving end is connected with the radio frequency input port 1 of the I-path frequency mixing module of the receiving end, and the output end of the Q-path filter of the receiving end is connected with the radio frequency input port 1 of the Q-path frequency mixing module of the receiving end.
As an alternative embodiment, both coupling units comprise one coupler. The port 3 of the coupler at the transmitting end is connected with the output port of the filter I at the transmitting end, the port 2 of the coupler at the transmitting end is connected with the output port of the filter Q at the transmitting end, and the port 1 of the coupler at the transmitting end is connected with the port 4 of the coupler at the receiving end; and the No. 2 port of the coupler of the receiving end is connected with the input port of the I-path filter of the receiving end, and the No. 3 port of the coupler of the receiving end is connected with the input port of the Q-path filter of the receiving end.
As an optional implementation manner, the transmitting terminal further includes a matching load, the matching load is used for absorbing the I-path terahertz signal of the transmitting terminal, and the matching load is connected to the port No. 4 of the coupler of the transmitting terminal. Further, the receiving end further includes an antenna, and in this embodiment, a terahertz antenna is preferably used, and the antenna is used to receive or transmit a terahertz signal, and is connected to port No. 1 of the coupler of the receiving end.
As an optional implementation manner, the transmitting end and the receiving end both further include a local oscillator power divider. The input ports of the two local oscillator power dividers are both used for accessing local oscillator input signals, and two output ports of the local oscillator power divider at the transmitting end are respectively connected with a local oscillator input port 5 of an I-path frequency mixing module and a local oscillator input port 5 of a Q-path frequency mixing module at the transmitting end; two output ports of the local oscillator power divider at the receiving end are respectively connected with the local oscillator input port 5 of the I-path frequency mixing module and the local oscillator input port 5 of the Q-path frequency mixing module at the receiving end. It should be noted that the local oscillator power dividing unit is configured to generate two paths of intermediate frequency local oscillator signals I and Q for driving the frequency mixing unit.
As an optional implementation manner, the transmitting end further includes a first baseband signal processing platform, the first baseband signal processing platform is provided with two output ports, and the two output ports are respectively connected to the radio frequency input port 1 of the I-path frequency mixing module and the radio frequency input port 1 of the Q-path frequency mixing module of the transmitting end. Furthermore, the receiving end further comprises a second baseband signal processing platform, the second baseband signal processing platform is provided with two input ports, and the two input ports are respectively connected with the intermediate frequency output port 8 of the I-path frequency mixing module and the intermediate frequency output port 8 of the Q-path frequency mixing module of the receiving end.
The working principle of the terahertz frequency division duplex I/Q modulation-demodulation transceiving front end is as follows:
for a receiving end, a terahertz signal is received through an antenna (terahertz antenna), and a coupler divides the received terahertz signal into two paths of signals, namely an I path and a Q path, which have equal power and 90-degree phase difference; the two paths of signals are respectively input to an I path filter and a Q path filter for filtering, and then are respectively input to an I path frequency mixing module and a Q path frequency mixing module; under the drive of two local oscillation signals I and Q output by the local oscillation power divider, the two terahertz signals are respectively converted into two intermediate frequency signals I and Q through two frequency mixing modules I and Q, and are directly input to a second baseband signal processing platform at the rear end for data processing.
For a transmitting terminal, under the drive of local oscillator signals I and Q output by a local oscillator power divider, frequency conversion is carried out on two paths of intermediate frequency signals I and Q input by a first baseband signal processing platform by two paths of frequency mixing modules I and Q into two paths of terahertz signals I and Q; after the two paths of terahertz signals are respectively input into two filters for filtering, in the coupler, the I path of terahertz signal is absorbed by a matched load to form a path (Q path) of terahertz signal; the terahertz signal of the channel (Q channel) is input to a coupler of a receiving end, reflected by a filter of the receiving end and transmitted to a free space through an antenna of the receiving end.
In summary, the terahertz frequency division duplex I/Q modulation-demodulation transceiving front end provided by the invention can reduce the complexity of a system link, and realize terahertz full-duplex communication while realizing miniaturization of the terahertz transceiving front end link.
Example two
As shown in fig. 3-6, the present invention provides an embodiment in which the coupler in the first embodiment is a terahertz 3dB coupler. Specifically, the terahertz 3dB coupler at the receiving end is a 5-branch directional coupler, and the terahertz 3dB coupler at the transmitting end is a 3-branch directional coupler. The four ports of the two couplers are designed by adopting WR-4 standard waveguide ports, and the results of HFSS simulation are shown in figures 4 and 6. The coupler at the receiving end has the advantages that the unevenness of the amplitudes of signals of No. 2 and No. 3 ports of the coupler at the receiving end is less than 0.25dB within the frequency range of 200-230GHz, and the phase difference is about 90 degrees; the coupler at the transmitting end has the advantages that the unevenness degree of the amplitude of signals of No. 2 and No. 3 ports is less than 0.05dB and the phase difference is about 90 degrees in the frequency range of 200-210 GHz.
As shown in fig. 7-8, the filters of the receiving end and the transmitting end are all terahertz filters, and both adopt 5-order chebyshev cavity filters. Both ports of the filter are designed by adopting WR-4 standard waveguide port, and the result of HFSS simulation is shown in figure 8. The working frequency of the receiving end filter is 190-200GHz, and the in-band return loss is better than 20dB; the working frequency of the filter at the transmitting end is 220-230GHz, and the in-band return loss is better than 20dB; the isolation between the two filters is greater than 40dB.
As shown in fig. 9 to 10, since the bandwidth required by the transceiver front-end of this embodiment is 30GHz, the operating frequencies of the I-channel mixing module and the Q-channel mixing module based on the antiparallel schottky diode pair 3 can meet the requirements. Therefore, the frequency mixing modules of the receiving end and the transmitting end both adopt the same circuit structure, and certainly, the frequency mixing modules can be terahertz second harmonic mixers. In the two frequency mixing modules (see embodiment one for specific structure), the rf ports of the I-path frequency mixing module and the Q-path frequency mixing module both use WR-4 standard waveguides, the local oscillator input port 5 thereof uses WR-8 standard waveguides, the frequency mixing circuit is designed based on a 50 μm thick quartz substrate, and the gold layer thickness is 17 μm. The second harmonic mixing circuit adopts the ADS + HFSS software joint simulation mode, and the simulation result of the frequency conversion loss is shown in figure 10. In the frequency range of 200-230GHz, the frequency conversion loss of the I-path mixing module and the Q-path mixing module is better than 8.5dB.
As shown in fig. 11 to 12, the two local oscillator power dividers of this embodiment adopt a wilkinson power divider circuit structure, and are configured to divide the local oscillator input signal into two local oscillator signals, so as to drive the I-path frequency mixing module and the Q-path frequency mixing module to operate. Because the I-path frequency mixing module and the Q-path frequency mixing module can reduce the local oscillation frequency by half, the power dividers of the receiving end and the transmitting end work in the frequency range of 100-115 GHz. The local oscillator power divider is designed based on WR-8 standard waveguide, the diaphragm is used for fine tuning the amplitudes of two paths of signals, and HFSS simulation results are shown in figure 12, wherein in the frequency range of 100-115GHz, the amplitude difference of signals of a port 2 (a port 2 in the figure) and a port 3 (a port 3 in the figure) is less than 0.05dB, and the return loss is better than 13dB. It should be noted that, in the receiving end and the transmitting end, the port 3 and the port 2 of the local oscillator power divider serve as output ends, and the port 1 (port 1 in the figure) serves as an input end.
Based on the design, in the embodiment, the terahertz frequency division duplex I and Q directly modulates and demodulates the transceiving front end, and the specific performance indexes of the transceiving front end are as follows:
the working frequency of the receiving end is as follows: 200-210GHz; transmitting end operating frequency: 220-230GHz; isolation between transmitting end and receiving end: >40dB, the whole front-end can be integrated in a 40mm x 20mm module.
Further, the working principle of the terahertz frequency division duplex I, Q direct modulation and demodulation transceiving front end of the present embodiment is as follows:
for a receiving end, a 200-210GHz terahertz signal (radio frequency signal) is received by a terahertz antenna and then input into a 3dB coupler to be divided into I and Q radio frequency signals with equal power and 90-degree phase difference, and the I and Q radio frequency signals are input into a terahertz filter for filtering through No. 2 and No. 3 ports of the coupler; the input local oscillation signal with the working frequency of 102.5GHz is processed by a local oscillation power divider to obtain two paths of local oscillation signals with equal power, namely I and Q; under the drive of the local oscillation signal, the two frequency mixing modules respectively carry out frequency conversion on the filtered I and Q radio frequency signals to obtain I and Q intermediate frequency signals with the frequency of 1-5GHz, and the I and Q intermediate frequency signals are directly input into the second baseband signal processing platform to complete signal demodulation.
For a transmitting terminal, two local oscillator signals with equal power are obtained by an input local oscillator signal with the working frequency of 112.5GHz through a local oscillator power divider; under the drive of the local oscillation signal, the two-path frequency mixing module directly converts the I and Q intermediate frequency signals with the working frequency range of 1-5GHz output by the first baseband signal processing platform into 220-230GHz, the I and Q intermediate frequency signals are respectively input into ports 2 and 3 of the coupler to be combined after passing through the terahertz filter, and then the I and Q intermediate frequency signals are output through the port 1. Coupling signals of No. 2 and No. 3 ports output by the No. 4 port of the coupler at the transmitting end are absorbed by the matched load; and the signal output by the coupler No. 1 port of the transmitting end is input to the receiving end through the coupler No. 4 port of the receiving end. The coupling signal input into the receiving end is firstly divided into two paths of signals I and Q by a coupler of the receiving end, and the signals are respectively output into two paths of filters of the receiving end through a No. 2 port and a No. 3 port, and because the working frequency of the filter of the transmitting end is positioned at a stop band of the working frequency of the filter of the receiving end, the signals of the couplers of the No. 2 and No. 3 ports of the receiving end are totally reflected; and then the two paths of signals are combined into one path of signal through a coupler of the receiving end and the one path of signal is input into the terahertz antenna through a No. 1 port of the coupler of the receiving end and is transmitted to a free space.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A terahertz frequency division duplex I/Q modulation-demodulation transceiving front end is characterized by comprising a transmitting end and a receiving end; the transmitting end and the receiving end respectively comprise a coupling unit, a filtering unit and a frequency mixing unit which are connected in sequence; the coupling unit of the transmitting end is connected with the coupling unit of the receiving end; the working frequency of the filtering unit at the receiving end is positioned in a stop band of the working frequency of the filtering unit at the transmitting end;
the frequency mixing unit of the transmitting end is used for modulating the input two paths of intermediate frequency signals I and Q into two paths of terahertz signals I and Q, and the coupling unit of the transmitting end is used for synthesizing the two paths of terahertz signals I and Q into a single path of terahertz signal; the coupling unit of the receiving end is used for separating the received one-way terahertz signal into two paths of terahertz signals I and Q, and the mixing unit of the receiving end is used for demodulating the two paths of terahertz signals I and Q into two paths of intermediate frequency signals I and Q.
2. The front-end of claim 1, wherein the two mixing units each comprise an I-channel mixing module and a Q-channel mixing module;
the I-path mixing module and the Q-path mixing module respectively comprise a radio frequency input port, a radio frequency probe, a Schottky diode pair, a local oscillator filter, a local oscillator input port, a local oscillator intermediate frequency duplexer, an intermediate frequency filter and an intermediate frequency output port; the radio frequency probe, the Schottky diode pair, the local oscillator filter, the local oscillator intermediate frequency duplexer and the intermediate frequency filter are sequentially connected; radio frequency input port sets up radio frequency probe department, local oscillator input port sets up local oscillator intermediate frequency duplexer department, intermediate frequency output port sets up intermediate frequency filter department.
3. The thz frequency-division duplex I/Q modem transceiver front-end of claim 2, wherein two schottky diodes of the schottky diode pair are connected in anti-parallel.
4. The front-end of claim 2, wherein the two filtering units each comprise an I-path filter and a Q-path filter;
the input end of the I-path filter of the transmitting end is connected with the intermediate frequency output port of the I-path mixing module of the transmitting end, and the input end of the Q-path filter of the transmitting end is connected with the intermediate frequency output port of the Q-path mixing module of the transmitting end;
the output end of the I-path filter of the receiving end is connected with the radio frequency input port of the I-path frequency mixing module of the receiving end, and the output end of the Q-path filter of the receiving end is connected with the radio frequency input port of the Q-path frequency mixing module of the receiving end.
5. The terahertz frequency-division duplex I/Q modem transceiving front end of claim 4, wherein both of the coupling units comprise a coupler;
the port 3 of the coupler at the transmitting end is connected with the output port of the I-path filter at the transmitting end, the port 2 of the coupler is connected with the output port of the Q-path filter, and the port 1 of the coupler is connected with the port 4 of the coupler at the receiving end;
and the No. 2 port of the coupler of the receiving end is connected with the input port of the I-path filter of the receiving end, and the No. 3 port of the coupler of the receiving end is connected with the input port of the Q-path filter of the coupler of the receiving end.
6. The front-end of claim 5, wherein the transmitter further comprises a matching load, the matching load is configured to absorb the I-way terahertz signal of the transmitter, and the matching load is connected to port 4 of the coupler of the transmitter.
7. The thz frequency division duplex I/Q modem transceiving front end of claim 5, wherein the receiving end further comprises an antenna, the antenna is used for receiving or transmitting thz signals, and the antenna is connected to port 1 of the coupler of the receiving end.
8. The front end of the terahertz frequency division duplex I/Q modulation-demodulation transceiver according to claim 2, wherein the transmitting end and the receiving end each further comprise a local oscillator power divider;
the input ports of the two local oscillator power dividers are both used for accessing local oscillator input signals, and two output ports of the local oscillator power divider at the transmitting end are respectively connected with the local oscillator input port of the I-path frequency mixing module and the local oscillator input port of the Q-path frequency mixing module at the transmitting end; two output ports of the local oscillator power divider of the receiving end are respectively connected with a local oscillator input port of the I-path frequency mixing module and a local oscillator input port of the Q-path frequency mixing module of the receiving end.
9. The front-end according to claim 2, wherein the transmitter further comprises a first baseband signal processing platform for inputting an intermediate frequency signal to the transmitter, the first baseband signal processing platform is provided with two output ports, and the two output ports are respectively connected to the rf input port of the I-path mixing module and the rf input port of the Q-path mixing module of the transmitter.
10. The front-end according to claim 2, wherein the receiving end further comprises a second baseband signal processing platform for processing two paths of intermediate frequency signals, I and Q, converted by the frequency mixing unit of the receiving end, and the second baseband signal processing platform is provided with two input ports, and the two input ports are respectively connected to the intermediate frequency output port of the I-path frequency mixing module and the intermediate frequency output port of the Q-path frequency mixing module of the receiving end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211144102.1A CN115225109B (en) | 2022-09-20 | 2022-09-20 | Terahertz frequency division duplex I/Q modulation-demodulation transceiving front end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211144102.1A CN115225109B (en) | 2022-09-20 | 2022-09-20 | Terahertz frequency division duplex I/Q modulation-demodulation transceiving front end |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115225109A CN115225109A (en) | 2022-10-21 |
| CN115225109B true CN115225109B (en) | 2022-11-29 |
Family
ID=83616880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211144102.1A Active CN115225109B (en) | 2022-09-20 | 2022-09-20 | Terahertz frequency division duplex I/Q modulation-demodulation transceiving front end |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115225109B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5493719A (en) * | 1994-07-01 | 1996-02-20 | The United States Of America As Represented By The Secretary Of The Air Force | Integrated superconductive heterodyne receiver |
| CN105390783A (en) * | 2015-08-31 | 2016-03-09 | 电子科技大学 | Image frequency rejection frequency mixer structure for terahertz wave band |
| CN107276540A (en) * | 2017-08-10 | 2017-10-20 | 四川久成泰安科技有限公司 | A kind of Terahertz image frequency suppresses mixting circuit |
| CN107342780A (en) * | 2017-07-28 | 2017-11-10 | 电子科技大学 | A kind of new all solid state Terahertz receiver front end |
| CN107370458A (en) * | 2017-07-28 | 2017-11-21 | 电子科技大学 | A kind of Terahertz mixting circuit based on single slice integration technique |
| CN109245828A (en) * | 2018-11-22 | 2019-01-18 | 中国工程物理研究院电子工程研究所 | A kind of Terahertz wireless transceiver system for blackout range telemetry communication |
| CN109981135A (en) * | 2019-04-23 | 2019-07-05 | 四川众为创通科技有限公司 | Terahertz is the same as transmitting-receiving full duplex multi-carrier communications systems |
| CN113765589A (en) * | 2021-09-03 | 2021-12-07 | 网络通信与安全紫金山实验室 | Terahertz wireless optical fiber expansion device and real-time transmission system thereof |
| WO2022036872A1 (en) * | 2020-08-18 | 2022-02-24 | 中电科仪器仪表有限公司 | Broadband terahertz fourth harmonic mixer circuit, mixer, and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0803093D0 (en) * | 2008-02-20 | 2008-03-26 | Ucl Business Plc | Apparatus and method for transporting multiple signals over optical fiber |
-
2022
- 2022-09-20 CN CN202211144102.1A patent/CN115225109B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5493719A (en) * | 1994-07-01 | 1996-02-20 | The United States Of America As Represented By The Secretary Of The Air Force | Integrated superconductive heterodyne receiver |
| CN105390783A (en) * | 2015-08-31 | 2016-03-09 | 电子科技大学 | Image frequency rejection frequency mixer structure for terahertz wave band |
| CN107342780A (en) * | 2017-07-28 | 2017-11-10 | 电子科技大学 | A kind of new all solid state Terahertz receiver front end |
| CN107370458A (en) * | 2017-07-28 | 2017-11-21 | 电子科技大学 | A kind of Terahertz mixting circuit based on single slice integration technique |
| CN107276540A (en) * | 2017-08-10 | 2017-10-20 | 四川久成泰安科技有限公司 | A kind of Terahertz image frequency suppresses mixting circuit |
| CN109245828A (en) * | 2018-11-22 | 2019-01-18 | 中国工程物理研究院电子工程研究所 | A kind of Terahertz wireless transceiver system for blackout range telemetry communication |
| CN109981135A (en) * | 2019-04-23 | 2019-07-05 | 四川众为创通科技有限公司 | Terahertz is the same as transmitting-receiving full duplex multi-carrier communications systems |
| WO2022036872A1 (en) * | 2020-08-18 | 2022-02-24 | 中电科仪器仪表有限公司 | Broadband terahertz fourth harmonic mixer circuit, mixer, and method |
| CN113765589A (en) * | 2021-09-03 | 2021-12-07 | 网络通信与安全紫金山实验室 | Terahertz wireless optical fiber expansion device and real-time transmission system thereof |
Non-Patent Citations (4)
| Title |
|---|
| "220GHz多电路集成技术";牛中乾;《中国博士学位论文全文数据库》;20210315;I135-46 * |
| "220GHz太赫兹全双工高速通信系统";牛中乾等;《无线电通信技术》;20190930;第45卷(第6期);643-647 * |
| "A wideband terahertz planar Schottky diode fourth-harmonic mixer with low LO power requirement";杨益林等;《红外与毫米波学报》;20201015;第39卷(第5期);540-546 * |
| "Design of a 0.22THz IQ sub-harmonic mixers";YanQiu Zhang等;《2021 International Conference on Microwave and Millimeter Wave Technology(ICMMT)》;20211201;23-26 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115225109A (en) | 2022-10-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1049310C (en) | Radio receiver | |
| US4492960A (en) | Switching mixer | |
| CN109981135A (en) | Terahertz is the same as transmitting-receiving full duplex multi-carrier communications systems | |
| CN208028884U (en) | A kind of RF receiving/transmission device | |
| KR20070050466A (en) | Wireless data communication device | |
| US20060146917A1 (en) | Multi-mode transmitter circuit for switching over between TDMA mode and CDMA mode | |
| EP1605585B1 (en) | Harmonic mixer using anti parallel diodes | |
| CN109921820A (en) | Terahertz is same to receive and dispatch full duplex communication system | |
| CN113471686A (en) | Active integrated electrically-modulated polarized transmitting-receiving panel antenna | |
| JP5702722B2 (en) | Dual mode mixer | |
| CN105490733A (en) | Signal transceiver | |
| JPH0378329A (en) | Rf transmitting/receiving circuit of shifting body communication facility | |
| CN107769800B (en) | Multi-frequency point terahertz inter-satellite communication receiver | |
| CN115225109B (en) | Terahertz frequency division duplex I/Q modulation-demodulation transceiving front end | |
| CN206023750U (en) | A kind of antenna assembly of integrated RF front-end circuit | |
| CN115801036A (en) | 5G millimeter wave bidirectional double-frequency transceiver mechanism | |
| CN110808787A (en) | All-optical image frequency suppression frequency mixing device and method | |
| CN209448742U (en) | Terahertz is the same as transmitting-receiving full duplex multi-carrier communications systems | |
| CN111987994B (en) | High-performance miniaturized monolithic integrated harmonic mixer | |
| EP1089446A1 (en) | Radio terminal device | |
| CN116996025B (en) | Terahertz image rejection mixer, communication circuit and communication equipment | |
| CN217546043U (en) | Ka frequency channel frequency conversion receiving and dispatching subassembly | |
| JP2002330085A (en) | Transceiver | |
| RU187238U1 (en) | Receiver device with operating frequencies of 220-300 GHz | |
| CN216356719U (en) | Transceiver, chip, system on chip and chip system for increasing 2.4GHz frequency band communication distance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |