CN109981135B - Terahertz simultaneous transceiving full-duplex multi-carrier communication system - Google Patents
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- H—ELECTRICITY
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- 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
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- H04B1/54—Circuits using the same frequency for two directions of communication
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Abstract
The invention discloses a terahertz simultaneous transceiving full-duplex multi-carrier communication system, which realizes the transmission and the reception of terahertz signals in the same radio frequency front end; the system comprises a terahertz antenna, a terahertz radio frequency front end, an intermediate frequency circuit and a baseband circuit; the terahertz radio frequency front end comprises a terahertz band-pass filter, a terahertz orthogonal mode coupler, a terahertz subharmonic mixer and a terahertz frequency multiplication link; the intermediate frequency circuit comprises a transmitting intermediate frequency circuit and a receiving intermediate frequency circuit; the baseband circuit comprises N paths of DACs and N paths of ADCs; wherein N is a positive integer greater than or equal to 2. The invention adopts the multi-carrier transmission technology, reasonably utilizes the spectrum resources of the terahertz channel, improves the communication rate by N times under the condition of the same ADC sampling rate, and improves the utilization efficiency of the spectrum resources.
Description
Technical Field
The invention relates to the technical field of terahertz communication, in particular to a terahertz synchronous receiving and transmitting full-duplex multi-carrier communication system.
Background
Terahertz waves refer to electromagnetic waves having frequencies between 100GHz and 10 THz. This segment of the electromagnetic spectrum has been in a special position between the traditional electronics and photonics research bands, and has been relatively rarely studied and exploited in the past. With the rapid development of wireless communication, existing spectrum resources have become increasingly scarce, developing a new frequency band for wireless communication has become a consensus for solving the contradiction, and there are a large number of undeveloped spectrum resources in the terahertz frequency band, so that the terahertz frequency is suitable as a new frequency band for future wireless communication. Among the many technical approaches, the wireless communication system is realized by adopting the technical approach of solid-state electronics, and the possibility of on-chip integration of the system exists in the future, which has important significance for the trend of the terahertz wireless communication system to practical use.
The bandwidth requirement for wireless short-range communications doubles every 18 months according to Edholm's bandwidth law. The demands for bandwidth, capacity and transmission rate of future wireless communication are said to be almost endless, the spectrum resource is an intangible strategic resource of each country, the contradiction between supply and demand of the resource is very prominent at present, and the demands are more and more urgent, so that people can shift the development of new frequency resources to terahertz frequency bands with less attention in the past.
The most significant advantage of using terahertz frequencies for wireless communication is the absolute bandwidth resources that exist in large amounts in the terahertz frequency band. On the ground, terahertz wireless communication is very suitable for application occasions of short-distance high-speed wireless data transmission, and in space, because terahertz waves have small attenuation in an approximately vacuum environment, large-capacity data transmission by using terahertz waves is an ideal choice for inter-satellite networking and inter-satellite communication.
Terahertz communication has some advantages over microwave millimeter wave communication and laser communication in addition to the above-described inherent advantages of large bandwidth. First, terahertz wave is shorter than millimeter wave wavelength, and the diffraction is less, therefore the directionality is stronger, and simultaneously the ultra-high bandwidth spread spectrum communication is easy to realize to terahertz frequency band, which has important meaning to secret communication. In addition, under severe environmental conditions such as rain, fog, haze and battlefield, the attenuation of the terahertz wave is smaller than that of the light wave, so that the terahertz wave is easier to realize reliable communication transmission than the light wave under the specific requirements of communication distance and natural conditions.
At present, a solid-state terahertz communication system based on a semiconductor technology adopts a scheme of separating a receiving end from a transmitting end, wherein the transmitting end is connected with an independent antenna, and the receiving end is connected with another independent antenna, so that the function of simultaneously receiving and transmitting by using the same antenna can not be realized. For higher gain and better performance, the size of the antenna is often larger, and if the conventional scheme is used to realize the co-transmitting and receiving functions, the front end of the communication system is too large, which is not beneficial to the integration of the system. Meanwhile, the existing solid-state terahertz communication system based on the semiconductor technology is a single-carrier scheme, and is limited by the development of an analog-to-digital converter (ADC), the current commercial ADC chip is only 10Gbps at most, and the single-carrier scheme can only use a part of spectrum resources in a terahertz channel, so that the advantage of large bandwidth of a terahertz frequency band can not be fully exerted, the communication rate of the terahertz communication system is limited, and the use efficiency of the spectrum resources is reduced.
Disclosure of Invention
In order to solve the technical problems of poor integration, limitation of communication rate and the like of the existing terahertz communication system, the invention provides a terahertz synchronous receiving and transmitting full-duplex multi-carrier communication system for solving the problems.
The invention is realized by the following technical scheme:
the terahertz simultaneous transceiving full-duplex multi-carrier communication system comprises a terahertz antenna, a terahertz radio frequency front end, an intermediate frequency circuit and a baseband circuit; the terahertz radio frequency front end comprises a terahertz band-pass filter, a terahertz orthogonal mode coupler, a terahertz subharmonic mixer and a terahertz frequency multiplication link; the intermediate frequency circuit comprises a transmitting intermediate frequency circuit and a receiving intermediate frequency circuit; the baseband circuit comprises N paths of DACs and N paths of ADCs; wherein N is a positive integer greater than or equal to 2; the system combines two paths of orthogonal receiving and transmitting signals into one path of signals through the terahertz orthogonal mode coupler, generates mode isolation, and realizes the transmission and the reception of terahertz signals in the same radio frequency front end.
Preferably, the transmitting intermediate frequency circuit comprises a low-pass filter, a multiplexer, an intermediate frequency mixer and a band-pass filter; n paths of DAC generate N paths of modulated signals which are input to the transmitting intermediate frequency circuit, spurious signals are filtered through low-pass filters of the transmitting intermediate frequency circuit respectively, one path of signals directly enter a multiplexer, the other N-1 paths of signals are frequency shifted through self intermediate frequency mixers and then filtered through respective band-pass filters, and finally enter the multiplexer of the transmitting intermediate frequency circuit; the multiplexer combines the signals of N paths of different frequency bands into a path of broadband signal, inputs the broadband signal into the terahertz radio frequency front end, moves to the terahertz frequency band through the terahertz subharmonic mixer, forms mode isolation with the received signal through the terahertz orthogonal mode coupler, performs sideband suppression through the terahertz band-pass filter, and finally transmits the signal to the terahertz channel through the terahertz antenna.
Preferably, the receiving intermediate frequency circuit comprises a low noise amplifier, a low pass filter, a multiplexer, an intermediate frequency mixer, a band pass filter and a high pass filter; the terahertz antenna receives the signals of the terahertz signals, suppresses the useless signals through the terahertz band-pass filter, enters a terahertz subharmonic mixer through a terahertz orthogonal mode coupler to move the signals to an intermediate frequency band, passes through a low-noise amplifier and a low-pass filter of a receiving intermediate frequency circuit, and is divided into N paths through a multiplexer of the receiving intermediate frequency circuit, and one path of signals directly enters an ADC (analog to digital converter) for demodulation after passing through the low-pass filter of the receiving intermediate frequency circuit; in addition, the N-1 paths are respectively subjected to frequency conversion by a respective high-pass filter and an intermediate-frequency mixer, then are subjected to respective low-pass filters, and finally enter respective ADCs for demodulation.
Preferably, the intermediate frequency circuit further comprises a 50MHz crystal oscillator and a phase-locked medium oscillator; the 50MHz crystal oscillator signal passes through a phase-locked loop circuit and a terahertz frequency multiplication link, and the terahertz signal is generated to provide local oscillation drive for a terahertz subharmonic mixer.
Preferably, the terahertz subharmonic mixer is used for moving the intermediate frequency signal to the terahertz frequency band or moving the terahertz frequency band signal to the intermediate frequency band; the terahertz orthogonal mode coupler is used for combining the transmitting signal and the receiving signal with mutually orthogonal modes, generating mode isolation and preventing the transmitting signal and the receiving signal from interfering with each other.
Preferably, the terahertz orthogonal mode coupler includes a first port, a second port and a third port; the first port is a square waveguide port and is used for passing two orthogonal polarized mode waves; the second port and the third port are standard rectangular waveguide ports.
Preferably, the narrow side of the waveguide structure between the first port and the second port of the terahertz orthogonal mode coupler and the narrow side of the waveguide structure between the first port and the third port are designed to be changed along the broadside direction.
The invention has the following advantages and beneficial effects:
1. According to the terahertz radio frequency front-end circuit, the radio frequency front-end circuit is improved, the radio frequency front-end circuit is integrated with a transmitting channel and a receiving channel, the frequencies are the same, the modes are mutually orthogonal, an orthogonal mode coupler (Orthomode Transducer, OMT) is adopted to be connected with the radio frequency front-end circuit, two paths of orthogonal receiving and transmitting signals are combined into one path of signal through the orthogonal mode coupler, so that the terahertz signal can be received through the terahertz orthogonal mode coupler, and the transmitting signal can be sent to the terahertz channel through the terahertz antenna. On the basis of realizing the function of simultaneously transmitting and receiving terahertz signals, the invention adopts only one antenna for the transmitting channel and the receiving channel, greatly reduces the volume of the front end of a communication system and utilizes the miniaturization of the system.
2. Meanwhile, in order to improve the communication rate of the terahertz communication system, the invention improves the front-end circuit part, moves two paths of DAC signals to different frequency bands for combining, and moves the combined signals to the terahertz channel.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
fig. 1 is a schematic block diagram of a communication system of the present invention.
Fig. 2 is a schematic block diagram of a dual carrier communication system of the present invention.
Fig. 3 is a schematic diagram of the terahertz orthogonal mode coupler according to the present invention.
Fig. 4 is a schematic diagram of the working principle of the terahertz orthogonal mode coupler of the present invention.
Detailed Description
Hereinafter, the terms "comprises" or "comprising" as may be used in various embodiments of the present invention indicate the presence of inventive functions, operations or elements, and are not limiting of the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the invention, the terms "comprises," "comprising," and their cognate terms are intended to refer to a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be interpreted as first excluding the existence of or increasing likelihood of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B or may include both a and B.
Expressions (such as "first", "second", etc.) used in the various embodiments of the invention may modify various constituent elements in the various embodiments, but the respective constituent elements may not be limited. For example, the above description does not limit the order and/or importance of the elements. The above description is only intended to distinguish one element from another element. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described to "connect" one component element to another component element, a first component element may be directly connected to a second component element, and a third component element may be "connected" between the first and second component elements. Conversely, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular is intended to include the plural as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the invention belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having a meaning that is the same as the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in connection with the various embodiments of the invention.
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
The embodiment provides a terahertz simultaneous transceiving full-duplex multi-carrier communication system, which comprises a terahertz antenna, a terahertz radio frequency front end, an intermediate frequency circuit and a baseband circuit, as shown in fig. 1.
The communication system of the embodiment realizes the transmission and the reception of the terahertz signal in the same radio frequency front end, that is, the radio frequency front end integrates a transmission channel and a reception channel at the same time, the frequencies are the same and the modes are mutually orthogonal, a terahertz orthogonal mode coupler (Orthomode Transducer, OMT) is adopted to be connected with the communication system, the two paths of orthogonal receiving and transmitting signals are combined into one path of signal through the orthogonal mode coupler, the terahertz signal can be received through the terahertz orthogonal mode coupler, and the transmission signal can be sent to the terahertz channel through the terahertz antenna.
In this embodiment, as shown in fig. 1, the terahertz radio frequency front end includes a terahertz band-pass filter, a terahertz orthogonal mode coupler, a terahertz subharmonic mixer, and a terahertz frequency-doubling link; the intermediate frequency circuit comprises a transmitting intermediate frequency circuit and a receiving intermediate frequency circuit; the baseband circuit comprises N paths of DACs and N paths of ADCs; wherein N is a positive integer greater than or equal to 2.
In this embodiment, the transmitting intermediate frequency circuit includes an N-way Low Pass Filter (LPF), an N-1 way intermediate frequency mixer, an N-1 way Band Pass Filter (BPF) and a multiplexer; the N paths of DAC generate N paths of modulated signals and input the N paths of modulated signals into the transmitting intermediate frequency circuit for processing: after N paths of signals are filtered by the low-pass filters respectively, the 1 st path of signals directly enter the multiplexer, and the 2 nd to N paths of signals are respectively frequency shifted by the intermediate frequency mixers and then enter the multiplexer (namely N paths of DACs are arranged in one-to-one correspondence with the N paths of low-pass filters, and the 2 nd to N paths of DACs are arranged in one-to-one correspondence with the N-1 path of intermediate frequency mixers and the N-1 band-pass filter); the multiplexer combines the modulated signals of the N non-communication frequency bands into one broadband signal, and inputs the broadband signal into the terahertz radio frequency front end for processing: after the frequency of a broadband signal is shifted to a terahertz frequency band through a terahertz subharmonic mixer, mode isolation is formed between the broadband signal and a received signal through a terahertz orthogonal mode coupler, mutual interference of receiving and transmitting signals is prevented, useless sidebands are restrained through a terahertz band-pass filter, single sideband transmission is achieved, and finally the signals are transmitted to a terahertz channel through a terahertz antenna, so that a terahertz signal transmitting channel is formed. A Low Pass Filter (LPF) in the transmitting intermediate frequency circuit effectively inhibits spurious signals of signals output by the baseband DAC, and prevents the spurious signals from interfering with the system.
In this embodiment, the receiving intermediate frequency circuit includes an N-way Low Pass Filter (LPF), an N-1 way intermediate frequency mixer, an N-1 way High Pass Filter (HPF), a multiplexer and a low noise amplifier; the terahertz antenna receives useful signals of terahertz signals, suppresses useless signals through a terahertz band-pass filter, enters a path of terahertz subharmonic mixer through a terahertz orthogonal mode coupler to move the signals to an intermediate frequency band, passes through an intermediate frequency low-noise amplifier, is divided into N paths through a duplexer, directly enters an ADC for demodulation after being filtered by a low-pass filter of the first path, sequentially passes through respective high-pass filters and intermediate frequency mixers for frequency conversion to a proper frequency band, passes through respective low-pass filters, finally enters respective ADCs for demodulation (namely, the N paths of ADCs are arranged in one-to-one correspondence with the N paths of low-pass filters, and the 2 nd to N paths of ADCs are arranged in one-to-one correspondence with the N-1 path of intermediate frequency mixer and the N-1 high-pass filter), so that a terahertz signal receiving channel is formed.
In another preferred embodiment, an intermediate frequency low pass filter LPF (not shown in fig. 1) may be provided between the low noise amplifier and the diplexer to filter spurious signals of the received signal. The low-pass filter in the receiving intermediate frequency circuit is used for effectively suppressing spurious signals in signals input to the baseband ADC and preventing the spurious signals from interfering with the system. The low noise amplifier is used for amplifying the received intermediate frequency signal.
In this embodiment, the intermediate frequency circuit further includes a 50MHz crystal oscillator and a Phase locked dielectric oscillator (Phase-locked Dielectric Resonator Oscillator, PDRO); the 50MHz crystal oscillator signal passes through a phase-locked loop circuit (Phase Locked Loop, PLL) to generate millimeter wave signals to provide local oscillation drive for the intermediate frequency mixer; the signals generated by the 50MHz crystal oscillator are connected with the terahertz frequency doubling link through a Phase-locked medium oscillator (Phase-locked Dielectric Resonator Oscillator, PDRO), and terahertz signals are generated to provide local oscillation drive for the terahertz subharmonic mixer so as to drive the terahertz subharmonic mixer to work effectively.
In this embodiment, the terahertz subharmonic mixer in the transmitting channel is used to shift the intermediate frequency signal to the terahertz frequency band (up-conversion function); the terahertz subharmonic mixer in the receiving channel is used for moving the terahertz frequency band signal to an intermediate frequency band (down-conversion function). The terahertz orthogonal mode coupler is used for combining the transmitting signals and the receiving signals with mutually orthogonal modes, generating mode isolation and preventing the transmitting signals and the receiving signals from interfering with each other; the terahertz band-pass filter filters useless sidebands of the double-sideband signals generated by the mixer, performs sideband suppression, and prevents the other sideband signals from affecting the communication system.
According to the communication system, on the basis of realizing the function of simultaneously transmitting and receiving terahertz signals in a double-transmission full-duplex mode, only one antenna is adopted for the transmitting channel and the receiving channel, so that the volume of the front end of the communication system is greatly reduced, and the miniaturization of the system is utilized.
The communication system of the embodiment also adopts a multi-carrier transmission technology, reasonably utilizes the spectrum resources of the terahertz channel, improves the communication rate by N times under the condition of the same ADC sampling rate, and improves the utilization efficiency of the spectrum resources. In order to realize single sideband transmission, the embodiment adopts a sideband suppression technology, namely, a terahertz band-pass filter is added behind a mixer of a transmitter and in front of a mixer of a receiver to effectively suppress one sideband, so that the energy waste caused by simultaneous transmission of two sidebands is prevented, and the waste of signal channel resources is avoided.
Example 2
Based on the above embodiment 1, this embodiment proposes a terahertz co-transceiver full duplex dual carrier communication system, i.e. when n=2, as shown in fig. 2.
The communication system of the embodiment can realize the dual functions of transmitting and receiving signals at the same time, and the system comprises a terahertz antenna, a terahertz radio frequency front end part, an intermediate frequency circuit part and a baseband part.
The terahertz radio frequency front end part comprises a terahertz band-pass filter, a terahertz orthogonal mode coupler, a terahertz subharmonic mixer and a terahertz frequency multiplication link. The two paths of DAC respectively generate two paths of modulated signals, the two paths of modulated signals are input into an intermediate frequency dual-carrier circuit, spurious signals are filtered through an LPF (low pass filter) of the intermediate frequency circuit, one path of signals are subjected to frequency shifting through an intermediate frequency mixer, then the modulated signals in two paths of different frequency ranges are combined into one path of broadband signals through a duplexer, the broadband signals are input into a terahertz radio frequency front end part, communication signals enter a terahertz subharmonic mixer to be shifted to a terahertz frequency range, mode isolation is formed between the terahertz OMT and a received signal, mutual interference of the received signals is prevented, sideband suppression is performed through a terahertz band-pass filter, and finally a transmitting signal is transmitted to a terahertz channel through a terahertz antenna;
The receiving circuit receives useful signals of a terahertz channel through a terahertz antenna, suppresses the useless signals through a terahertz band-pass filter, enters a terahertz subharmonic mixer through a terahertz OMT, moves the signals to an intermediate frequency band, filters stray signals through an intermediate frequency low-noise amplifier and an intermediate frequency low-pass filter (the low-pass filter is not shown in fig. 2), then is divided into two paths through a duplexer, one path directly enters an ADC1 through the low-pass filter for demodulation, and the other path sequentially enters an ADC2 for demodulation after being subjected to frequency conversion to a proper frequency band through a high-frequency filter and an intermediate frequency mixer through the low-pass filter.
Example 3
Based on the above embodiment 1 and embodiment 2, the present embodiment also optimizes the structure of the terahertz orthogonal mode coupler. As shown in fig. 3.
The terahertz orthogonal mode coupler (terahertz OMT) of this embodiment has a structure including one input section (port 1), two output sections (port 2 and port 3), and orthogonal separation sections, as shown in fig. 3. Two orthogonal polarized mode waves (horizontal polarization and vertical polarization) from port 1, a vertical polarized wave is output from port 2 and a horizontal polarized wave is output from port 3 through a polarization separation structure and a transition structure, as shown in fig. 4. Of course, reverse usage is also possible, port 2 and port 3 being mutually independent. Port 1 is a square waveguide port, ports 2 and 3 are standard rectangular waveguide ports, WR-4, with dimensions 1.092mm x 0.546mm.
The propagation electric field of the main mode TE10 wave is related to the broad side of the waveguide and not to the narrow side. To reduce insertion loss, continuity of the long side of the waveguide with the corresponding polarization mode is maintained. By reducing the width of the narrow sides, isolation from the orthogonal modes is enhanced, as shown in FIG. 3. One quarter of a circular waveguide is used to adjust the propagation direction of a vertically polarized wave. Since the distance from port 1 to port 3 is greater than from port 2, the energy loss is also greater. The transition design from port 1 to port 3 is relatively slow and is not a standard isosceles trapezoid.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (1)
1. The terahertz simultaneous transceiving full-duplex multi-carrier communication system is characterized by comprising a terahertz antenna, a terahertz radio frequency front end, an intermediate frequency circuit and a baseband circuit; the terahertz radio frequency front end comprises a terahertz band-pass filter, a terahertz orthogonal mode coupler, a terahertz subharmonic mixer and a terahertz frequency multiplication link; the intermediate frequency circuit comprises a transmitting intermediate frequency circuit and a receiving intermediate frequency circuit; the baseband circuit comprises N paths of DACs and N paths of ADCs; wherein N is a positive integer greater than or equal to 2; the system combines two paths of orthogonal receiving and transmitting signals into one path of signals through a terahertz orthogonal mode coupler, generates mode isolation, and realizes the transmission and the reception of terahertz signals in the same radio frequency front end; the transmitting intermediate frequency circuit comprises a low-pass filter, a multiplexer, an intermediate frequency mixer and a band-pass filter; n paths of DAC generate N paths of modulated signals which are input to the transmitting intermediate frequency circuit, spurious signals are filtered through low-pass filters of the transmitting intermediate frequency circuit respectively, one path of signals directly enter a multiplexer, the other N-1 paths of signals are frequency shifted through self intermediate frequency mixers and then filtered through respective band-pass filters, and finally enter the multiplexer of the transmitting intermediate frequency circuit; the multiplexer combines the signals of N paths of different frequency bands into a path of broadband signal, inputs the broadband signal into the terahertz radio frequency front end, moves to the terahertz frequency band through the terahertz subharmonic mixer, forms mode isolation with the received signal through the terahertz orthogonal mode coupler, performs sideband suppression through the terahertz band-pass filter, and finally transmits the signal to the terahertz channel through the terahertz antenna; the receiving intermediate frequency circuit comprises a low noise amplifier, a low pass filter, a multiplexer, an intermediate frequency mixer, a band pass filter and a high pass filter; the terahertz antenna receives the signals of the terahertz signals, suppresses the useless signals through the terahertz band-pass filter, enters a terahertz subharmonic mixer through a terahertz orthogonal mode coupler to move the signals to an intermediate frequency band, passes through a low-noise amplifier and a low-pass filter of a receiving intermediate frequency circuit, and is divided into N paths through a multiplexer of the receiving intermediate frequency circuit, and one path of signals directly enters an ADC (analog to digital converter) for demodulation after passing through the low-pass filter of the receiving intermediate frequency circuit; in addition, the N-1 paths pass through respective high-pass filters and intermediate-frequency mixers in sequence for frequency conversion, pass through respective low-pass filters, and finally enter respective ADCs for demodulation;
The terahertz orthogonal mode coupler comprises a first port, a second port and a third port; the first port is a square waveguide port and is used for passing two orthogonal polarized mode waves; the second port and the third port are standard rectangular waveguide ports;
The narrow sides of the waveguide structure between the first port and the second port of the terahertz orthogonal mode coupler and the narrow sides of the waveguide structure between the first port and the third port are designed to be changed along the broadside direction.
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| CN110445507B (en) * | 2019-08-13 | 2021-06-15 | 李冲 | Millimeter wave terahertz transceiver module and working method thereof |
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