Aerosol-generating device

Abstract

The invention relates to an aerosol generating device which comprises a microwave heating assembly and a microwave generating unit, and the microwave generating unit comprises a microwave coupler and a detection circuit; the microwave coupler comprises a main signal microstrip line, one end of which is an input end and the other end of which is an output end; the coupling micro-strip line and the main signal micro-strip line are arranged at intervals, one end of the coupling micro-strip line is a coupling end, and the other end of the coupling micro-strip line is an isolation end; the interdigital structure is arranged between the main signal microstrip line and the coupling microstrip line and is respectively connected with the main signal microstrip line and the coupling microstrip line; the microwave coupler is in mirror symmetry along the center line. The microwave coupler is provided with the interdigital structures, the interdigital structures are symmetrically arranged, bidirectional sampling can be achieved, and directivity is improved. Through the compact interdigital coupling design, the size of the circuit can be reduced, the flatness in a working frequency band is improved, and meanwhile, the working frequency sampling range of the circuit is widened.

Description

Technical Field

[0001] The present invention relates to the field of microwave technology, and in particular to an aerosol generating device. Background Art

[0002] Microwave sampling circuits are an indispensable part of many electronic devices. Microwave sampling circuits are commonly used in multiple aspects such as signal acquisition, circuit detection, power measurement, frequency tracking, etc. However, traditional sampling circuits are large in size, have a narrow applicable frequency range, have a single sampling directivity, and are not flexible enough to use.

[0003] For traditional sampling circuits, one way is to adopt a cascaded structure of stage detection. The sampling circuit adopts a stacked body structure design, which is large in size. It is necessary to draw a package on the PCB, leave space, and then patch it to be used. If reverse sampling is required, a sampling circuit with the same stacked design is also needed, resulting in a complex overall structure, more components, higher costs, larger volume, and poor versatility. Once the input and output change directions, it is necessary to start over and re-design, with poor versatility. Secondly, the sampling circuit designed with a stacked body structure generally adopts a parallel line method. The designed sampling circuit has a narrow applicable frequency range, a large flatness, and poor directivity. When applied to communication sampling circuits and frequency tracking circuits for microwave atomization, it will result in a large circuit size, heavy weight, inconvenience for portability, etc. After the applicable frequency range is narrow, problems such as circuit instability will occur.

[0004] Traditional sampling circuits are generally designed unidirectionally and cannot be used once the circuit direction changes. These disadvantages such as large volume, heavy weight, high manufacturing cost, and small directivity bring inconvenience to universality and portability. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an improved aerosol generating device.

[0006] The technical solution adopted by the present invention to solve its technical problems is: constructing an aerosol generating device, including:

[0007] A microwave heating component for heating an aerosol generation matrix; and

[0008] A microwave generating unit including a microwave coupler and a detection circuit;

[0009] The microwave coupler includes:

[0010] A main signal microstrip line with one end as an input end and the other end as an output end;

[0011] A coupling microstrip line spaced from the main signal microstrip line, and one end is a coupling end and the other end is an isolation end; and

[0012] A cross-finger structure is disposed between the main signal microstrip line and the coupling microstrip line, and is respectively connected to the main signal microstrip line and the coupling microstrip line;

[0013] The microwave coupler is mirror symmetric along the central axis.

[0014] In some embodiments, the cross-finger structure includes a first cross-finger and a second cross-finger. The first cross-finger is vertically connected to the main signal microstrip line, and the second cross-finger is vertically connected to the coupling microstrip line;

[0015] The first cross-finger and the second cross-finger are alternately arranged in a direction perpendicular to the central axis of the microwave coupler.

[0016] In some embodiments, the number of the first cross-fingers is n, and the number of the second cross-fingers is n + 1.

[0017] In some embodiments, the number of the first cross-fingers is 4, and the number of the second cross-fingers is 5.

[0018] In some embodiments, the depth of the first cross-finger is 0.215 mm, the width is 0.125 mm, and the length is 0.335 mm.

[0019] In some embodiments, the distance between two adjacent first cross-fingers is 0.875 mm.

[0020] In some embodiments, the depth of the second cross-finger is 0.215 mm, the width is 0.125 mm, and the length is 0.335 mm.

[0021] In some embodiments, the distance between two adjacent second cross-fingers is 0.875 mm.

[0022] In some embodiments, the microwave coupler further includes a resistor. The resistor is disposed on the coupling microstrip line. One path of the coupling end is grounded through the resistor, and the other path of the coupling end is connected to the isolation end through the resistor.

[0023] In some embodiments, the microwave generating unit further includes a microwave generating source and a power amplifying circuit. The microwave generating source generates a microwave signal, and the microwave signal is amplified by the power amplifying circuit. The microwave coupler inputs the energy coupled out from the amplified microwave signal into a detection circuit.

[0024] Implementing the present invention has the following beneficial effects: The microwave coupler of the present invention is provided with a cross-finger structure. The cross-finger structure is arranged in a symmetric manner, which can realize bidirectional sampling and improve the directivity. The compact cross-finger coupling design can reduce the size of the circuit, improve the flatness within the working frequency band, and also broaden the working frequency sampling range of the circuit. Brief Description of the Drawings

[0025] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0026] Figure 1 is a schematic structural diagram of an embodiment of the aerosol generating device of the present invention;

[0027] Figure 2 is a schematic structural diagram of an embodiment of the microwave generating unit of the present invention;

[0028] Figure 3 is a schematic structural diagram of an embodiment of the microwave coupler of the present invention;

[0029] Figure 4 is a schematic structural diagram of an embodiment of the main signal microstrip line of the present invention;

[0030] Figure 5 is a schematic structural diagram of an embodiment of the coupled microstrip line of the present invention;

[0031] Figure 6 is a graph showing the test results of the insertion loss of the microwave coupler of the present invention;

[0032] Figure 7 is a graph showing the test results of the forward coupling degree of the microwave coupler of the present invention;

[0033] Figure 8 is a graph showing the test results of the forward isolation degree of the microwave coupler of the present invention;

[0034] Figure 9 is a graph showing the test results of the reverse coupling degree of the microwave coupler of the present invention;

[0035] Figure 10 is a graph showing the test results of the reverse isolation degree of the microwave coupler of the present invention. Detailed Embodiments

[0036] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings, and are constructed and operated in a specific orientation, and are only for the convenience of describing the technical solution, rather than indicating that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0037] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installation", "connection", "linkage", "fixation", "setting", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. When one component is referred to as "on" or "under" another component, the component can be "directly" or "indirectly" located above the other component, or there may also be one or more intermediate components. Terms such as "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second", "third", etc. can explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the following description, specific details such as specific system structures, technologies, etc. are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0039] Figure 1 An aerosol generating device showing an embodiment of the present invention, the aerosol generating device includes a microwave heating component and a microwave generating unit. The microwave heating component includes, for example, a metal needle or a metal tube, and is used to radiate microwaves to heat the aerosol generating substrate. The microwave generating unit generates microwaves suitable for the microwave heating component, feeds them into the microwave heating component, and is used to heat the aerosol generating substrate, and the aerosol generating substrate is accommodated in the microwave heating component.

[0040] As Figure 2 shown, the microwave generating unit includes a microwave generating source, a power amplification circuit, a microwave coupler, and a detection circuit. The microwave coupler has a sampling function and is used to sample from the microwave signal. The microwave generating source generates microwaves with a specific wavelength, which are amplified by the power amplification circuit. The coupler couples out a part of the energy of the microwave signal, and the coupled energy is input into the detection circuit for signal detection. It can be understood that the microwave generating source, the power amplification circuit, and the detection circuit in this embodiment can adopt known related technologies.

[0041] Figure 3 A microwave coupler showing an embodiment of the present invention, the microwave coupler includes a main signal microstrip line 1, a coupling microstrip line 2, and an interdigital structure 3.

[0042] One end of the main signal microstrip line 1 is the input end, and the other end of the main signal microstrip line 1 is the output end. Specifically, the main signal microstrip line 1 serves as a transmission path. A first connection port P1 is provided at one end of the main signal microstrip line 1, and a second connection port P2 is provided at the other end of the main signal microstrip line 1. If one of the first connection port P1 and the second connection port P2 is used as the input end, then the other port is used as the output end.

[0043] The coupled microstrip line 2 is arranged at an interval from the main signal microstrip line 1, and one end thereof is the coupling end and the other end is the isolation end. A third connection port P3 is provided at one end of the coupled microstrip line 2, and a fourth connection port P4 is provided at the other end of the coupled microstrip line 2. If one of the third connection port P3 and the fourth connection port P4 is used as the coupling end for forward sampling, then the other port is used as the isolation end for reverse sampling.

[0044] In this embodiment, a double-interdigital coupling method of the main signal microstrip line 1 and the coupled microstrip line 2 is adopted. The interdigital structure 3 is arranged between the main signal microstrip line 1 and the coupled microstrip line 2 and is respectively connected to the main signal microstrip line 1 and the coupled microstrip line 2. The third connection port P3 and the fourth connection port P4 can be connected to the forward output port and the reverse output port to be sampled, and are coupled through the intermediate interdigital coupling method to couple the main signal microstrip line 1 to the coupled microstrip line 2 to meet the microwave sampling requirements.

[0045] The impedance of the main signal microstrip line 1 is designed as a microstrip structure of 50 ohms, and the electrical length is one-quarter of its wavelength equivalent on the main signal microstrip line 1 to best transmit the performance of the microwave.

[0046] In some embodiments, the interdigital structure 3 includes a plurality of first interdigital fingers 31 and a plurality of second interdigital fingers 32. The plurality of first interdigital fingers 31 are vertically connected to the main signal microstrip line 1, and the plurality of second interdigital fingers 32 are vertically connected to the coupled microstrip line 2. The plurality of first interdigital fingers 31 and the plurality of second interdigital fingers 32 are arranged alternately.

[0047] Among them, the microwave coupler is mirror-symmetrical along its central axis 10 to achieve bidirectional sampling. Specifically, the main signal microstrip line 1 is input at one end and output at the other end in a symmetrical manner. A plurality of first interdigital fingers 31 are arranged at the middle position thereof, that is, at the first connection port P1 and the second connection port P2, and the overall structure is symmetrical. The first connection port P1 and the second connection port P2 can be used interchangeably, and the power can be output from left to right or from right to left, improving the versatility. It can be understood that if the first connection port P1 is used as the input end, then the second connection port P2 is the output end; if the second connection port P2 is used as the input end, then the first connection port P1 is the output end.

[0048] Similarly, the coupled microstrip line 2 also adopts a symmetric manner, with forward sampling at one end and reverse sampling at the other end. A number of second cross fingers 32 are arranged at the middle position thereof, that is, the second cross fingers 32 cooperate with the first cross fingers 31 correspondingly. By changing the phase difference of the odd and even mode transmissions in the transmission path, the directivity of the sampling circuit is improved; the third connection port P3 and the fourth connection port P4 can be used interchangeably. The third connection port P3 can be used for both forward and reverse sampling, and the fourth connection port P4 can also be used for both forward and reverse sampling, improving the versatility of the circuit.

[0049] Optionally, the first cross fingers 31 and the second cross fingers 32 are alternately arranged along a direction perpendicular to the central axis 10 of the microwave coupler. The number of the first cross fingers 31 can be n, and the number of the second cross fingers 32 can be n + 1. It can be understood that the number of the first cross fingers 31 can also be n + 1, and then the number of the second cross fingers 32 can be n. In this way, while realizing that the first cross fingers 31 and the second cross fingers 32 are alternately arranged in sequence, it can also ensure that the cross finger structure 3 and even the whole microwave coupler are symmetric, so as to realize the two-way cross finger sampling method.

[0050] Specifically, as Figures 3 to 5 shown, the number of the first cross fingers 31 is 4, and the number of the second cross fingers 32 is 5. It can be understood that the numbers of the first cross fingers and the second cross fingers are not limited to this example and can be adjusted according to the actual situation, which is not limited herein.

[0051] In some embodiments, the microwave coupler further includes a resistor 4. The resistor 4 is arranged on the coupled microstrip line 2. One path of the coupling end is grounded through the resistor 4, and the other path of the coupling end is connected to the isolation end through the resistor 4. Specifically, the resistance value of the resistor 4 can be 50 ohms. By connecting a resistor 4 to the ground in the middle of the coupled microstrip line 2, the independence of the forward and reverse sampling circuits can be improved, the port matching can be enhanced, and at the same time, the power leaking from both sides of the sampling circuit can be absorbed.

[0052] In some embodiments, the depth of the first cross finger 31 can be 0.215 mm, the width W 1 of the first cross finger 31 can be 0.125 mm, and the length L 1 of the first cross finger 31 can be 0.335 mm. The distance g 1 between two adjacent first cross fingers 31 is 0.875 mm.

[0053] Optionally, the depth of the second cross finger 32 can be 0.215 mm, the width W 2 of the second cross finger 32 can be 0.125 mm, and the length L 2 of the second cross finger 32 can be 0.335 mm. The distance g 2It can be 0.875 mm.

[0054] Through the double stub structure, they are arranged in an alternating and symmetric manner to form an equivalent capacitive-inductive circuit, reducing the odd-mode and even-mode phase differences of the microstrip path of the sampling circuit and improving the directivity of the sampling circuit. The compact stub coupling design reduces the size of the circuit, improves the flatness within the operating frequency band, and also broadens the operating frequency sampling range of the circuit.

[0055] Next, the test is carried out in combination with this embodiment. The operating frequency band of 2.4 GHz to 2.5 GHz is selected, and the center operating frequency is 2.45 GHz.

[0056] Combined with Figure 6 , when testing the signal path from the first connection port P1 to the second connection port P2, from the first connection port P1 to the third connection port P3, and from the first connection port P1 to the fourth connection port P4, the return loss S11 is about -20 dB, the return loss S22 is about -19.6 dB, and the insertion loss S21 is about 0.3 dB. The test results show that the insertion loss S21 at the operating frequency band of 2.4 GHz is 0.29 dB, the insertion loss S21 at the operating frequency of 2.45 GHz is 0.3 dB, and the insertion loss S21 at the operating frequency of 2.5 GHz is 0.31 dB. It can be seen from this that its flatness is good, with only a fluctuation of 0.02 dB.

[0057] Combined with Figures 6 to 8 , it can be statistically obtained as Table 1. Table 1 is the forward data of the microwave coupler in this embodiment.

[0058] Table 1

[0059]

[0060] It can be seen from Table 1 that the forward directivity of this bidirectional sampling microwave circuit is above 22 dB.

[0061] Combined with Figure 6 , Figure 9 and Figure 10 , it can be statistically obtained as Table 2. Table 2 is the reverse data of the microwave coupler in this embodiment.

[0062] Table 2

[0063]

[0064] It can be seen from Table 2 that the reverse directivity of this bidirectional sampling microwave circuit is above 20 dB.

[0065] The circuit structure of the integrated sampling of the present invention has a symmetric design, including the main signal microstrip lines 1 that are symmetric left and right. In this sampling microwave circuit microstrip path, the main signal microstrip lines 1 and the coupling microstrip lines 2 adopt the circuit structure of the double-interdigital structure 3, which is easy to manufacture, can reduce the cost of the sampling circuit, and reduce the size; the coupling fluctuation is small, the sampling bandwidth is increased, and the flatness is high; the directivity can be improved, and the frequency tracking of the circuit can be improved; it is applicable to the reciprocal requirements of the main signal and the sampling signal, has the advantage of bidirectional sampling, and improves the applicability.

[0066] It can be understood that the above embodiments only express the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. An aerosol generating device, characterized in that, comprising: a microwave heating component for radiating microwaves; and a microwave generating unit including a microwave coupler and a detection circuit; the microwave coupler includes: a main signal microstrip line (1) with one end as an input end and the other end as an output end; a coupling microstrip line (2) spaced from the main signal microstrip line (1), and one end as a coupling end and the other end as an isolation end; and a cross-finger structure (3) disposed between the main signal microstrip line (1) and the coupling microstrip line (2) and connected to the main signal microstrip line (1) and the coupling microstrip line (2) respectively; the microwave coupler is mirror symmetric along the central axis (10).

2. The aerosol generating device according to claim 1, characterized in that, the cross-finger structure (3) includes a plurality of first cross-fingers (31) and a plurality of second cross-fingers (32), the plurality of first cross-fingers (31) are vertically connected to the main signal microstrip line (1), and the plurality of second cross-fingers (32) are vertically connected to the coupling microstrip line (2); the plurality of first cross-fingers and the plurality of second cross-fingers are alternately arranged in a direction perpendicular to the central axis (10) of the microwave coupler.

3. The aerosol generating device according to claim 2, characterized in that, the number of the first cross-fingers (31) is n, and the number of the second cross-fingers (32) is n + 1; or the number of the first cross-fingers (31) is n + 1, and the number of the second cross-fingers (32) is n.

4. The aerosol generating device according to claim 3, characterized in that, the number of the first cross-fingers (31) is 4, and the number of the second cross-fingers (32) is 5.

5. The aerosol generating device according to claim 2, characterized in that, the depth of the first cross-finger (31) is 0.215 mm, the width is 0.125 mm, and the length is 0.335 mm.

6. The aerosol generating device according to claim 2, characterized in that, the distance between two adjacent first cross-fingers (31) is 0.875 mm.

7. The aerosol generating device according to claim 2, characterized in that, the depth of the second cross-finger (32) is 0.215 mm, the width is 0.125 mm, and the length is 0.335 mm.

8. The aerosol generating device according to claim 2, characterized in that, the distance between two adjacent second cross-fingers (32) is 0.875 mm.

9. The aerosol generating device according to claim 1, characterized in that, the microwave coupler further includes a resistor (4), the resistor (4) is disposed on the coupling microstrip line (2), one path of the coupling end is grounded through the resistor (4), and the other path of the coupling end is connected to the isolation end through the resistor (4).

10. The aerosol generating device according to claim 1, characterized in that, The microwave generating unit further includes a microwave generating source and a power amplification circuit. The microwave generating source generates a microwave signal, which is amplified by the power amplification circuit. The microwave coupler inputs the energy coupled out from the amplified microwave signal into a detection circuit.

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