Terahertz power synthesis circuit

Abstract

The invention discloses a terahertz power synthesis circuit. The terahertz power synthesis circuit comprises a micro-coaxial input power divider circuit, a micro-coaxial output power synthesizer and two micro-coaxial frequency multipliers, the micro-coaxial input power divider circuit receives an input signal, divides the input signal into two paths of local oscillation signals and transmits the local oscillation signals to the micro-coaxial frequency multiplier; the micro coaxial frequency multiplier performs frequency multiplication amplification on the local oscillator signal to obtain a frequency multiplication local oscillator signal, and transmits the two paths of frequency multiplication local oscillator signals to a micro coaxial output power combiner; and the micro coaxial output power combiner carries out power synthesis on the two paths of frequency multiplication local oscillator signals to obtain an output signal. According to the embodiment of the invention, high isolation is realized based on micro coaxial structure connection, so that the interference of circuits between different branches is reduced, and the frequency doubling efficiency is improved; in addition, a repeated waveguide-probe transition structure is avoided, the loss is further reduced, and the frequency doubling efficiency is improved, so that the output power of the whole terahertz power synthesis circuit is improved.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a terahertz power synthesis circuit. Background Art

[0002] For the application field of terahertz frequency band, high-quality terahertz frequency source is the key to the application of terahertz system, and its performance largely determines the performance of the system. At present, terahertz solid-state frequency source is developing towards higher frequency, greater power, wider bandwidth, monolithic integration, ultra-low phase noise and other directions.

[0003] In order to achieve higher power output, waveguide-based power synthesis circuits (such as Y-type power dividers and couplers) are often used for power synthesis. To connect the waveguide circuit with the terahertz frequency multiplier, it is necessary to repeatedly use the waveguide to microstrip line transition structure, which will greatly increase the circuit loss and deteriorate the circuit performance.

[0004] At the same time, because the traditional T-type power divider is often not a matching circuit for each port, the isolation between the two output ports is poor, generally between 5-8dB. In the power synthesis network, the interference between different branches is serious, which will deteriorate the power synthesis efficiency and affect the output power of the terahertz source. Summary of the invention

[0005] The purpose of this application is to provide a terahertz power synthesis circuit to solve the technical problems of excessive circuit loss and poor isolation of the existing terahertz power synthesis circuit in the prior art. The preferred technical solutions among the many technical solutions provided in this application can produce many technical effects as described below.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] The present application provides a terahertz power synthesis circuit, comprising a micro-coaxial input power divider circuit, a micro-coaxial output power synthesizer and two micro-coaxial frequency multipliers; the micro-coaxial input power divider circuit receives an input signal, and divides the input signal into two local oscillator signals and transmits them to the micro-coaxial frequency multiplier; the micro-coaxial frequency multiplier performs frequency multiplication and amplification on the local oscillator signal to obtain a frequency multiplied local oscillator signal, and transmits the two frequency multiplied local oscillator signals to the micro-coaxial output power synthesizer; the micro-coaxial output power synthesizer performs power synthesis on the two frequency multiplied local oscillator signals to obtain an output signal; the micro-coaxial The first output port of the input power divider circuit of the micro-coaxial frequency multiplier is coaxially connected to the receiving end of one of the micro-coaxial frequency multipliers, and the second output port of the input power divider circuit of the micro-coaxial frequency multiplier is coaxially connected to the receiving end of another of the micro-coaxial frequency multipliers; the second input port of the output power synthesizer of the micro-coaxial frequency multiplier is coaxially connected to the output end of one of the micro-coaxial frequency multipliers, and the third input port of the output power synthesizer of the micro-coaxial frequency multiplier is coaxially connected to the output end of another of the micro-coaxial frequency multipliers; the two micro-coaxial frequency multipliers are symmetrically arranged with respect to the micro-coaxial input power divider circuit and the micro-coaxial output power synthesizer.

[0008] In some embodiments, the micro-coaxial input power divider circuit includes a first input port, a first isolation port, and a second isolation port; the first output port and the second output port are symmetrically arranged about the first input port, and the first isolation port and the second isolation port are symmetrically arranged about the first input port; the first input port is used to receive the input signal.

[0009] In some embodiments, the input power divider circuit of the micro-coaxial device includes a first input waveguide of the micro-coaxial device, a first output waveguide of the micro-coaxial device, a second output waveguide of the micro-coaxial device, a first isolation waveguide of the micro-coaxial device, a second isolation waveguide of the micro-coaxial device, and a first transition waveguide of the micro-coaxial device; one end of the first input waveguide of the micro-coaxial device is the first input port, and the other end of the first input waveguide of the micro-coaxial device is connected to the first end of the first transition waveguide of the micro-coaxial device; the first input waveguide of the micro-coaxial device, the first isolation waveguide of the micro-coaxial device, and the second isolation waveguide of the micro-coaxial device are all in the same orientation, and the first input waveguide of the micro-coaxial device is perpendicular to the orientation of the first transition waveguide of the micro-coaxial device, the first output waveguide of the micro-coaxial device, and the second output waveguide of the micro-coaxial device.

[0010] In some embodiments, the second end of the first transition waveguide of the micro-coaxial is coaxially connected to one end of the first output waveguide of the micro-coaxial and one end of the first isolation waveguide of the micro-coaxial, wherein the other end of the first output waveguide of the micro-coaxial is the first output port, and the other end of the first isolation waveguide of the micro-coaxial is the first isolation port; the third end of the first transition waveguide of the micro-coaxial is coaxially connected to one end of the second output waveguide of the micro-coaxial and one end of the second isolation waveguide of the micro-coaxial, wherein the other end of the second output waveguide of the micro-coaxial is the second output port, and the other end of the second isolation waveguide of the micro-coaxial is the second isolation port.

[0011] In some embodiments, the micro-coaxial output power synthesizer includes a third output port, a third isolation port and a fourth isolation port; the second input port and the third input port are symmetrically arranged about the third output port, and the third isolation port and the fourth isolation port are symmetrically arranged about the third output port; the third output port is used to feed the output signal.

[0012] In some embodiments, the micro-coaxial output power synthesizer includes a second input waveguide of the micro-coaxial, a third input waveguide of the micro-coaxial, a third output waveguide of the micro-coaxial, a third isolation waveguide of the micro-coaxial, a fourth isolation waveguide of the micro-coaxial and a second transition waveguide of the micro-coaxial; one end of the third output waveguide of the micro-coaxial is the third output port, and the other end of the third output waveguide of the micro-coaxial is connected to the first end of the second transition waveguide of the micro-coaxial; the third output waveguide of the micro-coaxial has the same orientation as the third isolation waveguide of the micro-coaxial and the fourth isolation waveguide of the micro-coaxial, and the third output waveguide of the micro-coaxial is perpendicular to the orientation of the second input waveguide of the micro-coaxial, the third input waveguide of the micro-coaxial and the second transition waveguide of the micro-coaxial.

[0013] In some embodiments, the micro-coaxial frequency multiplier includes an inner conductor lead-out direct connection structure, a transition structure of a fourth input waveguide of the micro-coaxial, a fourth input waveguide of the micro-coaxial for receiving the local oscillator signal, an input low-pass filter of the micro-coaxial for filtering the local oscillator signal, a diode pair for frequency-multiplying and amplifying the filtered local oscillator signal to generate a frequency-doubled local oscillator signal, a transition structure of a fourth output waveguide of the micro-coaxial, two micro-coaxial matching circuits and a fourth output waveguide of the micro-coaxial for feeding the frequency-doubled local oscillator signal; the first end of the inner conductor lead-out direct connection structure is directly connected to an external DC bias circuit through the inner conductor of the micro-coaxial, the second end of the inner conductor lead-out direct connection structure is coaxially connected to the transition structure of the fourth input waveguide of the micro-coaxial, and the inner conductor lead-out direct connection structure is used to introduce the bias voltage of the external DC bias circuit to reduce distortion.

[0014] In some embodiments, the first end of the transition structure of the fourth input waveguide of the micro-coaxial is coaxially connected to the second end of the inner conductor lead-out direct connection structure, the second end of the transition structure of the fourth input waveguide of the micro-coaxial is coaxially connected to the fourth input waveguide of the micro-coaxial, and the third end of the transition structure of the fourth input waveguide of the micro-coaxial is coaxially connected to the input low-pass filter of the micro-coaxial; the first end of the diode pair is coaxially connected to the input low-pass filter of the micro-coaxial through one of the micro-coaxial matching circuits, the second end of the diode pair is coaxially connected to the first end of the transition structure of the fourth output waveguide of the micro-coaxial through another micro-coaxial matching circuit, and the second end of the transition structure of the fourth output waveguide of the micro-coaxial is coaxially connected to the fourth output waveguide of the micro-coaxial.

[0015] In some embodiments, the transition structure of the fourth input waveguide of the micro-coaxial cable includes an input probe, which is formed by extending toward the interior of the fourth input waveguide of the micro-coaxial cable through an inner conductor of the transition structure of the fourth input waveguide of the micro-coaxial cable, and is used for impedance matching between the transition structure of the fourth input waveguide of the micro-coaxial cable and the fourth input waveguide of the micro-coaxial cable.

[0016] In some embodiments, the first end of the fourth input waveguide of the micro-coaxial is the receiving end of the micro-coaxial frequency multiplier, which is used to receive the local oscillator signal, and the second end of the fourth input waveguide of the micro-coaxial is coaxially connected to the input probe; the first end of the input probe is coaxially connected to the second end of the inner conductor lead-out direct connection structure, the second end of the input probe is coaxially connected to the second end of the fourth input waveguide of the micro-coaxial, and the third end of the input probe is coaxially connected to the first end of the input low-pass filter of the micro-coaxial.

[0017] Implementing one of the above technical solutions of the present application has the following advantages or beneficial effects: In the present application, by setting the input power divider circuit and the output power synthesizer of the micro-coaxial, the input signal is divided into two local oscillator signals and transmitted to the micro-coaxial frequency multiplier for frequency multiplication and amplification, and then the power is synthesized to obtain the output signal. On the one hand, due to the closed characteristics of the inner conductor of the micro-coaxial, the embodiment of the present application is based on the micro-coaxial structure connection, and a higher isolation degree is achieved, and the isolation degree can reach more than 20dB, thereby reducing the interference between the circuits of different branches and improving the frequency multiplication efficiency of the overall terahertz power synthesis circuit; on the other hand, the input power divider circuit and the output power synthesizer based on the micro-coaxial structure can be directly connected to the micro-coaxial frequency multiplier, avoiding repeated waveguide-probe transition structures, further reducing losses, and improving the frequency multiplication efficiency, thereby improving the output power of the overall terahertz power synthesis circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. It is obvious that the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 is a structural schematic diagram of a terahertz power synthesis circuit according to an embodiment of the present application;

[0020] Figure 2 is a schematic structural diagram of a micro-coaxial transmission line according to an embodiment of the present application;

[0021] Figure 3 is another structural schematic diagram of the terahertz power synthesis circuit of an embodiment of the present application;

[0022] Figure 4 is a schematic structural diagram of an inner conductor of a terahertz power synthesis circuit according to an embodiment of the present application;

[0023] Figure 5 It is a schematic structural diagram of the inner conductor of the micro-coaxial input power divider circuit of the embodiment of the present application;

[0024] Figure 6 is a schematic structural diagram of a micro-coaxial frequency multiplier according to an embodiment of the present application;

[0025] Figure 7 It is a schematic diagram of the structure of the inner conductor of the micro-coaxial frequency multiplier according to an embodiment of the present application.

[0026] In the figure: 1. Terahertz power synthesis circuit; 2. Micro-coaxial input power divider circuit; 3. Micro-coaxial output power synthesizer; 4. Micro-coaxial frequency multiplier;

[0027] 20, first output port; 21, second output port; 22, first input port; 23, first input waveguide of micro-coaxial; 24, first output waveguide of micro-coaxial; 25, second output waveguide of micro-coaxial; 26, first isolation waveguide of micro-coaxial; 27, second isolation waveguide of micro-coaxial; 28, first transition waveguide of micro-coaxial;

[0028] 30. second input port; 31. third input port; 32. third output port; 33. second input waveguide of micro-coaxial; 34. third input waveguide of micro-coaxial; 35. third output waveguide of micro-coaxial; 36. third isolation waveguide of micro-coaxial; 37. fourth isolation waveguide of micro-coaxial; 38. second transition waveguide of micro-coaxial;

[0029] 41. Inner conductor lead-out direct connection structure; 42. Transition structure of the fourth input waveguide of the micro-coaxial; 43. The fourth input waveguide; 44. The input low-pass filter of the micro-coaxial; 45. The diode pair; 46. The transition structure of the fourth output waveguide of the micro-coaxial; 47. The fourth output waveguide; 420. The input probe; 460. The output probe;

[0030] 11. The first turning waveguide of the micro-coaxial waveguide; 12. The second turning waveguide of the micro-coaxial waveguide; 13. The third turning waveguide of the micro-coaxial waveguide; 14. The fourth turning waveguide of the micro-coaxial waveguide; 15. The fifth turning waveguide of the micro-coaxial waveguide; 16. The sixth turning waveguide of the micro-coaxial waveguide. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present application clearer, the various exemplary embodiments to be described below will refer to the corresponding drawings, which constitute a part of the exemplary embodiments, wherein various exemplary embodiments that may be used to implement the present application are described. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with the present disclosure. It should be understood that they are only examples of processes, methods, and devices that are consistent with some aspects disclosed in the present application as detailed in the attached claims, and other embodiments may also be used, or the embodiments listed herein may be modified in structure and function without departing from the scope and essence of the present application.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", etc. indicate the orientation or positional relationship based on the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the elements referred to must have a specific orientation, be constructed and operated in a specific orientation. The terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "multiple" means two or more. The terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0033] In order to illustrate the technical solution described in the present application, a specific embodiment is provided below, and only the parts related to the embodiment of the present application are shown.

[0034] like Figure 1 As shown, the present application provides a terahertz power synthesis circuit 1 , which may include a micro-coaxial input power divider circuit 2 , a micro-coaxial output power synthesizer 3 and two micro-coaxial frequency multipliers 4 .

[0035] In some embodiments, the input power divider circuit 2 of the micro-coaxial device can receive an input signal and divide the input signal into two local oscillator signals to be transmitted to the micro-coaxial frequency multiplier 4 .

[0036] In some embodiments, the micro-coaxial frequency multiplier 4 can perform frequency multiplication and amplification on the local oscillator signal to obtain a frequency multiplied local oscillator signal, and transmit the two frequency multiplied local oscillator signals to the micro-coaxial output power combiner 3 .

[0037] In some embodiments, the micro-coaxial output power synthesizer 3 can perform power synthesis on two frequency-doubled local oscillator signals to obtain an output signal.

[0038] In some embodiments, the terahertz power synthesis circuit 1 can transmit signals through a rectangular micro-coaxial line. Figure 2 As shown, the rectangular micro coaxial line may include an inner conductor, a dielectric support and an outer shielding cavity. Specifically, the inner conductor may be a closed structure, the inner conductor may be arranged inside the outer shielding cavity, a dielectric support is arranged between the inner conductor and the outer shielding cavity, and the signal may be transmitted through the inner conductor.

[0039] In some embodiments, the transmission mode of the rectangular micro-coaxial line is the TEM mode. Therefore, the use of the rectangular micro-coaxial line for transmission has the advantages of low dispersion and low loss, and can enable the terahertz power synthesis circuit 1 to operate at a wider operating frequency.

[0040] In summary, the traditional rectangular waveguide has high-pass characteristics. For a rectangular waveguide of fixed size, it can only transmit electromagnetic waves of a fixed frequency band and cannot transmit broadband. At the same time, because the inner conductor of the rectangular micro-coaxial line is closed and has high isolation, even if two rectangular micro-coaxial lines are very close to each other, their mutual interference is extremely small, so they can be wired very close to each other. By adjusting the size of the inner conductor, it is easy to change the impedance. In addition, the performance of the rectangular micro-coaxial line is not affected by bending and cross-coupling, which facilitates the construction of complex circuits and devices, thereby achieving a high degree of integration of the circuit system.

[0041] In some embodiments, Figure 3 As shown, the first output port 20 of the micro-coaxial input power divider circuit 2 can be coaxially connected to the receiving end of a micro-coaxial frequency multiplier 4, and the second output port 21 of the micro-coaxial input power divider circuit 2 can be coaxially connected to the receiving end of another micro-coaxial frequency multiplier 4.

[0042] In some embodiments, Figure 4As shown, the second input port 30 of the micro-coaxial output power combiner 3 can be coaxially connected to the output end of one micro-coaxial frequency multiplier 4 , and the third input port 31 of the micro-coaxial output power combiner 3 can be coaxially connected to the output end of another micro-coaxial frequency multiplier 4 .

[0043] In some embodiments, two micro-coaxial frequency multipliers 4 may be symmetrically arranged with respect to the micro-coaxial input power divider circuit 2 and the micro-coaxial output power combiner 3 .

[0044] The coaxial connection in the embodiment of the present application may refer to a direct connection of the inner conductors of a micro-coaxial cable.

[0045] In some embodiments, Figure 5 As shown, the input power divider circuit 2 of the micro-coaxial may include a first input port 22, a first output port 20, a second output port 21, a first isolation port, and a second isolation port. The first output port 20 and the second output port 21 may be symmetrically arranged about the first input port 22, and the first isolation port and the second isolation port may be symmetrically arranged about the first input port 22. The first input port 22 may be used to receive an input signal.

[0046] In some embodiments, the first input port 22 can be used to receive an input signal, the first output port 20 and the second output port 21 can be used to output a local oscillator signal to the corresponding micro-coaxial frequency multiplier 4, and the first isolation port and the second isolation port can be used for signal isolation. The first output port 20 can be coaxially connected to one micro-coaxial frequency multiplier 4, and the second output port 21 can be coaxially connected to another micro-coaxial frequency multiplier 4.

[0047] In some embodiments, the micro-coaxial input power divider circuit 2 may include a first micro-coaxial input waveguide 23, a first micro-coaxial output waveguide 24, a second micro-coaxial output waveguide 25, a first micro-coaxial isolation waveguide 26, a second micro-coaxial isolation waveguide 27, and a first micro-coaxial transition waveguide 28.

[0048] In some embodiments, one end of the first input waveguide 23 of the micro-coaxial cable may be the first input port 22 , and the other end of the first input waveguide 23 of the micro-coaxial cable may be connected to the first end of the first transition waveguide 28 of the micro-coaxial cable.

[0049] In some embodiments, the first input waveguide 23 of the micro-coaxial can have the same orientation as the first isolation waveguide 26 of the micro-coaxial and the second isolation waveguide 27 of the micro-coaxial, and the first input waveguide 23 of the micro-coaxial can be perpendicular to the orientation of the first transition waveguide 28 of the micro-coaxial, the first output waveguide 24 of the micro-coaxial and the second output waveguide 25 of the micro-coaxial.

[0050] In some embodiments, the second end of the micro-coaxial first transition waveguide 28 can be coaxially connected to one end of the micro-coaxial first output waveguide 24 and one end of the micro-coaxial first isolation waveguide 26, wherein the other end of the micro-coaxial first output waveguide 24 can be the first output port 20, and the other end of the micro-coaxial first isolation waveguide 26 can be the first isolation port; the third end of the micro-coaxial first transition waveguide 28 can be coaxially connected to one end of the micro-coaxial second output waveguide 25 and one end of the micro-coaxial second isolation waveguide 27, wherein the other end of the micro-coaxial second output waveguide 25 can be the second output port 21, and the other end of the micro-coaxial second isolation waveguide 27 can be the second isolation port.

[0051] In some embodiments, the interior of the first isolation waveguide 26 of the micro-coaxial and the second isolation waveguide 27 of the micro-coaxial can be filled with absorbing materials, and the inner conductor of the first isolation waveguide 26 of the micro-coaxial and the inner conductor of the second isolation waveguide 27 of the micro-coaxial may not need to extend to the first isolation port and the second isolation port.

[0052] In some embodiments, the terahertz power synthesis circuit 1 may include a first micro-coaxial turn waveguide 11 and a second micro-coaxial turn waveguide 12 .

[0053] In some embodiments, one end of the micro-coaxial first turn waveguide 11 can be coaxially connected to the first output port 20, and the other end of the micro-coaxial first turn waveguide 11 can be coaxially connected to a micro-coaxial frequency doubler 4. One end of the micro-coaxial second turn waveguide 12 can be coaxially connected to the second output port 21, and the other end of the micro-coaxial second turn waveguide 12 can be coaxially connected to another micro-coaxial frequency doubler 4. The micro-coaxial first turn waveguide 11 and the micro-coaxial second turn waveguide 12 can be used to transmit the local oscillator signal to the corresponding micro-coaxial frequency doubler 4.

[0054] In some embodiments, impedance matching can be performed at the connection between the first micro-coaxial waveguide 11 and the first output port 20, and at the connection between the second micro-coaxial waveguide 12 and the second output port 21. The inner conductor size of the first micro-coaxial output waveguide 24 can be larger than the inner conductor size of the first micro-coaxial waveguide 11, and the inner conductor size of the second micro-coaxial output waveguide 25 can be larger than the inner conductor size of the second micro-coaxial waveguide 12. The first micro-coaxial waveguide 11 and the second micro-coaxial waveguide 12 can be symmetrically arranged with respect to the input power divider circuit 2 of the micro-coaxial.

[0055] In some embodiments, the micro-coaxial output power combiner 3 may include a second input port 30, a third input port 31, a third output port 32, a third isolation port and a fourth isolation port. The second input port 30 may be symmetrically arranged with the third input port 31 about the third output port 32, and the third isolation port may be symmetrically arranged with the fourth isolation port about the third output port 32; the third output port 32 may be used to feed the output signal.

[0056] In some embodiments, the second input port 30 and the third input port 31 can be used to receive the frequency-doubled local oscillator signal, and the third isolation port and the fourth isolation port can be used for signal isolation. The second input port 30 can be connected to a micro-coaxial frequency multiplier 4, and the third input port 31 can be connected to another micro-coaxial frequency multiplier 4.

[0057] In some embodiments, the micro-coaxial output power synthesizer 3 may include a second micro-coaxial input waveguide 33, a third micro-coaxial input waveguide 34, a third micro-coaxial output waveguide 35, a third micro-coaxial isolation waveguide 36, a fourth micro-coaxial isolation waveguide 37 and a second micro-coaxial transition waveguide 38; one end of the third micro-coaxial output waveguide 35 may be a third output port 32, and the other end of the third micro-coaxial output waveguide 35 may be connected to the first end of the second micro-coaxial transition waveguide 38.

[0058] In some embodiments, the third output waveguide 35 of the micro-coaxial can have the same orientation as the third isolation waveguide 36 of the micro-coaxial and the fourth isolation waveguide 37 of the micro-coaxial, and the third output waveguide 35 of the micro-coaxial can be perpendicular to the second input waveguide 33 of the micro-coaxial, the third input waveguide 34 of the micro-coaxial and the second transition waveguide 38 of the micro-coaxial.

[0059] In some embodiments, one end of the micro-coaxial third output waveguide 35 can be the third output port 32 of the micro-coaxial output power combiner 3 , and the other end of the micro-coaxial third output waveguide 35 can be coaxially connected to the first end of the micro-coaxial second transition waveguide 38 .

[0060] In some embodiments, the second end of the micro-coaxial second transition waveguide 38 can be coaxially connected to one end of the micro-coaxial second input waveguide 33 and one end of the micro-coaxial third isolation waveguide 36, wherein the other end of the micro-coaxial second input waveguide 33 can be the second input port 30, and the other end of the micro-coaxial third isolation waveguide 36 can be the third isolation port; the third end of the micro-coaxial second transition waveguide 38 can be coaxially connected to one end of the micro-coaxial third input waveguide 34 and one end of the micro-coaxial fourth isolation waveguide 37, wherein the other end of the micro-coaxial third input waveguide 34 can be the third input port 31, and the other end of the micro-coaxial fourth isolation waveguide 37 can be the fourth isolation port.

[0061] In some embodiments, the terahertz power synthesis circuit 1 may include a third micro-coaxial turn waveguide 13 , a fourth micro-coaxial turn waveguide 14 , a fifth micro-coaxial turn waveguide 15 , and a sixth micro-coaxial turn waveguide 16 .

[0062] In some embodiments, one end of the micro-coaxial third turn waveguide 13 can be coaxially connected to the second input port 30, and the other end of the micro-coaxial third turn waveguide 13 can be coaxially connected to one end of the micro-coaxial fifth turn waveguide 15, wherein the other end of the micro-coaxial fifth turn waveguide 15 is connected to a micro-coaxial frequency doubler 4.

[0063] In some embodiments, one end of the fourth micro-coaxial waveguide 14 can be coaxially connected to the third input port 31, and the other end of the fourth micro-coaxial waveguide 14 can be connected to one end of the sixth micro-coaxial waveguide 16, wherein the other end of the sixth micro-coaxial waveguide 16 can be connected to another micro-coaxial frequency doubler 4. The third micro-coaxial waveguide 13 and the fifth micro-coaxial waveguide 15, as well as the fourth micro-coaxial waveguide 14 and the sixth micro-coaxial waveguide 16 can be used to transmit two-way frequency-doubled local oscillator signals to the micro-coaxial output power synthesizer 3.

[0064] In some embodiments, the third turn waveguide 13 of the micro-coaxial cable and the fourth turn waveguide 14 of the micro-coaxial cable can be symmetrically arranged with respect to the output power combiner 3 of the micro-coaxial cable, and the fifth turn waveguide 15 of the micro-coaxial cable and the sixth turn waveguide 16 of the micro-coaxial cable can be symmetrically arranged with respect to the output power combiner 3 of the micro-coaxial cable.

[0065] In some embodiments, the third micro-coaxial waveguide 13 and the fifth micro-coaxial waveguide 15 may be centrally symmetrically arranged, and the fourth micro-coaxial waveguide 14 and the sixth micro-coaxial waveguide 16 may be centrally symmetrically arranged.

[0066] In some embodiments, Figure 6 As shown, the micro-coaxial frequency multiplier 4 may include an inner conductor lead-out direct connection structure 41, a transition structure 42 of the fourth input waveguide of the micro-coaxial, a fourth input waveguide of the micro-coaxial for receiving a local oscillator signal, an input low-pass filter 44 of the micro-coaxial for filtering the local oscillator signal, a diode pair 45 for frequency-multiplying and amplifying the filtered local oscillator signal to generate a frequency-doubled local oscillator signal, a transition structure 46 of the fourth output waveguide of the micro-coaxial, two micro-coaxial matching circuits and a fourth output waveguide 47 of the micro-coaxial for feeding the frequency-doubled local oscillator signal.

[0067] In some embodiments, the first end of the inner conductor lead-out direct connection structure 41 can be directly connected to an external DC bias circuit through the inner conductor of the micro-coaxial, and the second end of the inner conductor lead-out direct connection structure 41 can be coaxially connected to the transition structure 42 of the fourth input waveguide of the micro-coaxial, and the inner conductor lead-out direct connection structure 41 can be used to introduce the bias voltage of the external DC bias circuit to reduce distortion.

[0068] In the conventional frequency multiplier structure based on microstrip lines, since the substrate is often made of quartz substrate or other materials, the inner conductor of the coaxial connector cannot be directly connected to it, and an additional 5880 soft substrate transition needs to be set, which increases the volume of the circuit, the connection loss and the difficulty of overall processing. The inner conductor lead-out direct connection structure 41 of the embodiment of the present application can be formed by directly extending the rectangular micro-coaxial line, so the embodiment of the present application has the advantages of simple structure, convenient connection, low loss, small volume, etc.

[0069] In some embodiments, the inner conductor of the inner conductor lead-out direct connection structure 41 can extend from one end to the other end of the inner conductor lead-out direct connection structure 41. In other words, the inner conductor of the inner conductor lead-out direct connection structure 41 can be directly connected to the inner conductor of the inner conductor lead-out direct connection structure 41 through both ends of the inner conductor lead-out direct connection structure 41.

[0070] In some embodiments, the first end of the transition structure 42 of the fourth input waveguide of the micro-coaxial can be coaxially connected to the second end of the inner conductor lead-out direct connection structure 41, the second end of the transition structure 42 of the fourth input waveguide of the micro-coaxial can be coaxially connected to the fourth input waveguide 43 of the micro-coaxial, and the third end of the transition structure 42 of the fourth input waveguide of the micro-coaxial can be coaxially connected to the input low-pass filter 44 of the micro-coaxial.

[0071] In some embodiments, the first end of the diode pair 45 can be coaxially connected to the micro-coaxial input low-pass filter 44 through a micro-coaxial matching circuit, and the second end of the diode pair 45 can be coaxially connected to the first end of the transition structure 46 of the micro-coaxial fourth output waveguide through another micro-coaxial matching circuit, wherein the second end of the transition structure 46 of the micro-coaxial fourth output waveguide can be coaxially connected to the micro-coaxial fourth output waveguide 47.

[0072] In some embodiments, Figure 7 As shown, the transition structure 42 of the fourth input waveguide of the micro-coaxial device may include an input probe 420. The input probe 420 may be formed by extending the inner conductor of the transition structure 42 of the fourth input waveguide of the micro-coaxial device to the inside of the fourth input waveguide of the micro-coaxial device 43, and is used for impedance matching between the transition structure 42 of the fourth input waveguide of the micro-coaxial device and the fourth input waveguide of the micro-coaxial device 43. Therefore, in the embodiment of the present application, when the transition structure 42 of the fourth input waveguide of the micro-coaxial device transitions to the input waveguide 43, it is only necessary to extend the inner conductor outward, so the structure is simple and the circuit size is small.

[0073] In some embodiments, the first end of the fourth input waveguide 43 of the micro-coaxial can be the receiving end of the micro-coaxial multiplier 4, which is used to receive the local oscillator signal, and the second end of the fourth input waveguide 43 of the micro-coaxial can be connected to the input probe 420; the first end of the input probe 420 can be coaxially connected to the second end of the inner conductor lead-out direct connection structure 41, the second end of the input probe 420 can be coaxially connected to the second end of the fourth input waveguide 43 of the micro-coaxial, and the third end of the input probe 420 can be coaxially connected to the first end of the micro-coaxial input low-pass filter 44.

[0074] In some embodiments, the inner conductor of the micro-coaxial input low-pass filter 44 may include a plurality of rectangular branches. Specifically, the inner conductor of the micro-coaxial input low-pass filter 44 may extend in a direction perpendicular to the inner conductor extension direction to form a plurality of rectangular branches. Thus, the impedance can be changed, thereby achieving the performance of the resonant cavity and satisfying the filtering effect.

[0075] In some embodiments, the first end of the diode pair 45 can be coaxially connected to the micro-coaxial input low-pass filter 44 through a micro-coaxial matching circuit, and the second end of the diode pair 45 can be coaxially connected to the first end of the transition structure 46 of the micro-coaxial fourth output waveguide through another micro-coaxial matching circuit, wherein the second end of the transition structure 46 of the micro-coaxial fourth output waveguide can be connected to one end of the fourth output waveguide 47, wherein the other end of the fourth output waveguide 47 is the output end of the micro-coaxial frequency multiplier 4. The inner conductor of one micro-coaxial matching circuit can be directly connected to the inner conductor of the micro-coaxial input low-pass filter 44, and the other micro-coaxial matching circuit can be directly connected to the inner conductor of the transition structure 46 of the micro-coaxial fourth output waveguide.

[0076] In some embodiments, the diode pair 45 can be directly connected to the inner conductor of the micro-coaxial matching circuit at both ends of the diode pair 45. In this case, multiple coaxial to microstrip line transitions can be omitted, making the circuit structure of the micro-coaxial frequency multiplier 4 more compact; the heat dissipation area of ​​the diode pair 45 can be increased, reducing the influence of heat accumulation on the performance of the micro-coaxial frequency multiplier 4.

[0077] In some embodiments, the transition structure of the micro-coaxial output waveguide may include an output probe 460, which may be formed by extending the inner conductor of the transition structure 46 of the fourth output waveguide of the micro-coaxial toward the interior of the fourth output waveguide 47, for impedance matching between the transition structure 46 of the fourth output waveguide of the micro-coaxial and the fourth output waveguide 47.

[0078] Therefore, in the embodiment of the present application, when the transition structure 46 of the micro-coaxial output waveguide transitions to the output waveguide 47, it is only necessary to extend the inner conductor outward, so the structure is simple and the circuit size is small.

[0079] In some embodiments, the second ends of the two fourth output waveguides 47 are coaxially connected to the micro-coaxial output power combiner 3 respectively, so as to transmit two frequency-doubled local oscillator signals to the micro-coaxial output power combiner 3 .

[0080] In the present application, by setting up a micro-coaxial input power divider circuit 2 and an output power synthesizer, the input signal is divided into two local oscillator signals and transmitted to the micro-coaxial frequency multiplier 4 for frequency multiplication and amplification, and then the power is synthesized to obtain the output signal. On the one hand, due to the closed characteristics of the inner conductor of the micro-coaxial, the embodiment of the present application is based on the micro-coaxial structure connection, and a higher isolation degree is achieved, and the isolation degree can reach more than 20dB, thereby reducing the interference between the circuits of different branches and improving the frequency multiplication efficiency of the overall terahertz power synthesis circuit 1; on the other hand, the input power divider circuit and the output power synthesizer based on the micro-coaxial structure can be directly connected to the micro-coaxial frequency multiplier 4, avoiding repeated waveguide-probe transition structures, further reducing losses, and improving frequency multiplication efficiency, thereby improving the output power of the overall terahertz power synthesis circuit 1.

[0081] The above is only the preferred embodiment of the present application. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present application. In addition, under the guidance of the present application, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the protection scope of the present application.

Claims

1. A terahertz power synthesis circuit, characterized in that: It includes a micro-coaxial input power divider circuit, a micro-coaxial output power synthesizer and two micro-coaxial frequency multipliers; the micro-coaxial input power divider circuit receives an input signal, and divides the input signal into two local oscillator signals and transmits them to the micro-coaxial frequency multiplier; the micro-coaxial frequency multiplier performs frequency multiplication and amplification on the local oscillator signal to obtain a frequency multiplied local oscillator signal, and transmits the two frequency multiplied local oscillator signals to the micro-coaxial output power synthesizer; the micro-coaxial output power synthesizer performs power synthesis on the two frequency multiplied local oscillator signals to obtain an output signal; The first output port of the micro-coaxial input power divider circuit is coaxially connected to the receiving end of one of the micro-coaxial frequency multipliers, and the second output port of the micro-coaxial input power divider circuit is coaxially connected to the receiving end of another micro-coaxial frequency multiplier; The second input port of the micro-coaxial output power synthesizer is coaxially connected to the output end of one of the micro-coaxial frequency multipliers, and the third input port of the micro-coaxial output power synthesizer is coaxially connected to the output end of another micro-coaxial frequency multiplier; The two micro-coaxial frequency multipliers are symmetrically arranged with respect to the input power divider circuit of the micro-coaxial and the output power synthesizer of the micro-coaxial.

2. The terahertz power synthesis circuit according to claim 1, characterized in that: The micro-coaxial input power divider circuit includes a first input port, a first isolation port, and a second isolation port; the first output port and the second output port are symmetrically arranged about the first input port, and the first isolation port and the second isolation port are symmetrically arranged about the first input port; the first input port is used to receive the input signal.

3. The terahertz power synthesis circuit according to claim 2, characterized in that: The micro-coaxial input power divider circuit comprises a first input waveguide of the micro-coaxial, a first output waveguide of the micro-coaxial, a second output waveguide of the micro-coaxial, a first isolation waveguide of the micro-coaxial, a second isolation waveguide of the micro-coaxial and a first transition waveguide of the micro-coaxial; One end of the first input waveguide of the micro-coaxial is the first input port, and the other end of the first input waveguide of the micro-coaxial is connected to the first end of the first transition waveguide of the micro-coaxial; The first input waveguide of the micro-coaxial cable has the same orientation as the first isolation waveguide of the micro-coaxial cable and the second isolation waveguide of the micro-coaxial cable. The first input waveguide of the micro-coaxial cable is perpendicular to the first transition waveguide of the micro-coaxial cable, the first output waveguide of the micro-coaxial cable and the second output waveguide of the micro-coaxial cable.

4. The terahertz power synthesis circuit according to claim 3, characterized in that: The second end of the first transition waveguide of the micro-coaxial is coaxially connected to one end of the first output waveguide of the micro-coaxial and one end of the first isolation waveguide of the micro-coaxial, wherein the other end of the first output waveguide of the micro-coaxial is the first output port, and the other end of the first isolation waveguide of the micro-coaxial is the first isolation port; the third end of the first transition waveguide of the micro-coaxial is coaxially connected to one end of the second output waveguide of the micro-coaxial and one end of the second isolation waveguide of the micro-coaxial, wherein the other end of the second output waveguide of the micro-coaxial is the second output port, and the other end of the second isolation waveguide of the micro-coaxial is the second isolation port.

5. The terahertz power synthesis circuit according to claim 1, characterized in that: The micro-coaxial output power synthesizer includes a third output port, a third isolation port and a fourth isolation port; the second input port and the third input port are symmetrically arranged about the third output port, and the third isolation port and the fourth isolation port are symmetrically arranged about the third output port; the third output port is used to feed the output signal.

6. The terahertz power synthesis circuit according to claim 5, characterized in that: The micro-coaxial output power synthesizer comprises a second input waveguide of the micro-coaxial, a third input waveguide of the micro-coaxial, a third output waveguide of the micro-coaxial, a third isolation waveguide of the micro-coaxial, a fourth isolation waveguide of the micro-coaxial and a second transition waveguide of the micro-coaxial; one end of the third output waveguide of the micro-coaxial is the third output port, and the other end of the third output waveguide of the micro-coaxial is connected to the first end of the second transition waveguide of the micro-coaxial; The third output waveguide of the micro-coaxial cable has the same orientation as the third isolation waveguide of the micro-coaxial cable and the fourth isolation waveguide of the micro-coaxial cable. The third output waveguide of the micro-coaxial cable is perpendicular to the second input waveguide of the micro-coaxial cable, the third input waveguide of the micro-coaxial cable and the second transition waveguide of the micro-coaxial cable.

7. The terahertz power synthesis circuit according to claim 1, characterized in that: The micro-coaxial frequency multiplier includes an inner conductor lead-out direct connection structure, a transition structure of a fourth input waveguide of the micro-coaxial, a fourth input waveguide of the micro-coaxial for receiving the local oscillator signal, an input low-pass filter of the micro-coaxial for filtering the local oscillator signal, a diode pair for frequency-multiplying and amplifying the filtered local oscillator signal to generate a frequency-multiplied local oscillator signal, a transition structure of a fourth output waveguide of the micro-coaxial, two micro-coaxial matching circuits and a fourth output waveguide of the micro-coaxial for feeding the frequency-multiplied local oscillator signal; The first end of the inner conductor lead-out direct connection structure is directly connected to an external DC bias circuit through the inner conductor of the micro-coaxial, and the second end of the inner conductor lead-out direct connection structure is coaxially connected to the transition structure of the fourth input waveguide of the micro-coaxial, and the inner conductor lead-out direct connection structure is used to introduce the bias voltage of the external DC bias circuit to reduce distortion.

8. The terahertz power synthesis circuit according to claim 7, characterized in that: The first end of the transition structure of the fourth input waveguide of the micro-coaxial is coaxially connected to the second end of the inner conductor lead-out direct connection structure, the second end of the transition structure of the fourth input waveguide of the micro-coaxial is coaxially connected to the fourth input waveguide of the micro-coaxial, and the third end of the transition structure of the fourth input waveguide of the micro-coaxial is coaxially connected to the input low-pass filter of the micro-coaxial; The first end of the diode pair is coaxially connected to the input low-pass filter of the micro-coaxial through one of the micro-coaxial matching circuits, and the second end of the diode pair is coaxially connected to the first end of the transition structure of the fourth output waveguide of the micro-coaxial through another of the micro-coaxial matching circuits, wherein the second end of the transition structure of the fourth output waveguide of the micro-coaxial is coaxially connected to the fourth output waveguide of the micro-coaxial.

9. The terahertz power synthesis circuit according to claim 7, characterized in that: The transition structure of the fourth input waveguide of the micro-coaxial line includes an input probe, which is formed by extending toward the inside of the fourth input waveguide of the micro-coaxial line through the inner conductor of the transition structure of the fourth input waveguide of the micro-coaxial line, and is used for impedance matching between the transition structure of the fourth input waveguide of the micro-coaxial line and the fourth input waveguide of the micro-coaxial line.

10. The terahertz power synthesis circuit according to claim 9, characterized in that: The first end of the fourth input waveguide of the micro-coaxial is the receiving end of the micro-coaxial frequency multiplier, which is used to receive the local oscillator signal. The second end of the fourth input waveguide of the micro-coaxial is coaxially connected to the input probe; the first end of the input probe is coaxially connected to the second end of the inner conductor lead-out direct connection structure, the second end of the input probe is coaxially connected to the second end of the fourth input waveguide of the micro-coaxial, and the third end of the input probe is coaxially connected to the first end of the input low-pass filter of the micro-coaxial.

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