Variable impedance converter and electronic device

Abstract

The present invention relates to a variable impedance converter and electronic equipment, belonging to the technical field of integrated circuits. The present invention comprises an input coupling unit and an output coupling unit, wherein the input coupling unit and the output coupling unit comprise the same number of coupling coil pairs, each coupling coil pair comprises a first coupling coil and a second coupling coil; the first input end of the input coupling unit is connected to the first input end of the output coupling unit as the input end of the variable impedance converter; the first output end of the output coupling unit is used as the output end of the variable impedance converter; the second input end of the input coupling unit is connected to the second input end of the output coupling unit; the first output end of the input coupling unit is connected to the second output end of the output coupling unit; the second output end of the input coupling unit is used as the common end of the variable impedance converter; the variable impedance converter of the present invention has the advantages of low cost, small size, good bandwidth performance and low loss.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated circuits, and in particular to a variable impedance converter and electronic equipment. Background Art

[0002] With the advancement of electronic technology and the continuous development of communication systems, the demand for more complex and high-performance impedance matching devices is also increasing. In electronic circuits, the output impedance of the signal source usually needs to be matched with the input impedance of the load to ensure maximum power transfer and minimum signal reflection. Especially in RF and microwave circuits, impedance matching is critical to system performance. Single-ended variable impedance transformers can effectively achieve impedance matching in complex circuits, thereby improving the efficiency and performance of the overall system.

[0003] Existing single-ended variable impedance converters include a variety of designs and implementation methods, which can be divided into the following categories according to their working principles and application scenarios: 1. Transformer-type variable impedance converters use multiple windings or adjustable magnetic cores of the transformer to achieve impedance transformation. This impedance converter has good power transmission efficiency and broadband characteristics, but because the impedance of the parasitic capacitance and parasitic inductance inside the transformer increases with the increase of the signal transmission frequency, the entire device has a large loss during the high-frequency signal transmission process, and its volume is large, which is not suitable for microwave and radio frequency applications. 2. Electronic switch-type variable impedance converters (such as electronic switch transformers) use electronic switch technology (such as MOSFET switches) to dynamically adjust the impedance of the circuit. It has the advantages of fast response speed and good bandwidth performance, but the electronic switch will have switching losses during the switching operation, and there will be on-resistance when it is turned on, resulting in a large power loss of the device. 3. Capacitor-type variable impedance converters achieve impedance transformation by adjusting the capacitance value of the capacitor. It is simple, easy to implement and low cost, but due to factors such as the frequency dependence and parasitic effects of the capacitor itself, its frequency response is limited and can only be used in low-frequency signal transmission. 4. Variable impedance converters of integrated circuit type use the special circuit structure and programmable functions in integrated circuits to achieve dynamic adjustment of impedance. They are not only highly integrated, but also can achieve complex impedance matching and signal processing functions. However, they are costly, difficult to design and debug, and require professional circuit design and integration technical support. 5. Digitally controlled variable impedance converters achieve impedance transformation by controlling the parameters or switch states in the circuit through digital control signals. They can achieve precise impedance matching and are suitable for application scenarios that require remote or automated control. However, high-frequency and microwave application scenarios often require fast switching and high-speed signal transmission, and digital control systems need to process and convert control signals to adjust the state of variable impedance components, thereby introducing additional delays. In high-frequency applications, the dynamic power consumption of digital circuits will also increase significantly, resulting in higher power consumption of the entire device.

[0004] In summary, how to design a variable impedance converter with small size, good frequency adaptability and bandwidth performance, low power consumption and low cost is a problem that needs to be solved at present. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the variable impedance converter in the prior art cannot have small size, good frequency adaptability and bandwidth performance, low power consumption and low cost.

[0006] In order to solve the above technical problems, the present invention provides a variable impedance converter, comprising:

[0007] Input coupling unit;

[0008] An output coupling unit; wherein the input coupling unit and the output coupling unit include the same number of coupling coil pairs, each coupling coil pair including a first coupling coil and a second coupling coil;

[0009] The first input end of the input coupling unit and the first input end of the output coupling unit are connected as the input end of the variable impedance converter;

[0010] The first output end of the output coupling unit serves as the output end of the variable impedance converter;

[0011] The second input end of the input coupling unit is connected to the second input end of the output coupling unit; the first output end of the input coupling unit is connected to the second output end of the output coupling unit;

[0012] The second output terminal of the input coupling unit serves as a common terminal of the variable impedance converter;

[0013] The input coupling unit is composed of the 1st to N / 2nd coupling coil pairs; N is an even number;

[0014] The output coupling unit is composed of N / 2+1~N coupling coil pairs;

[0015] Among the N coupling coil pairs, each coupling coil pair includes a first coupling coil and a second coupling coil, the second end of the first coupling coil in the i-th coupling coil pair is connected to the first end of the first coupling coil in the i+1-th coupling coil pair; the second end of the second coupling coil in the i-th coupling coil pair is connected to the first end of the second coupling coil in the i+1-th coupling coil pair; ;

[0016] The first end of the first coupling coil in the first coupling coil pair is connected to the second end of the second coupling coil in the Nth coupling coil pair; the first end of the second coupling coil in the first coupling coil pair serves as a common end of the variable impedance transformer;

[0017] The second end of the first coupling coil in the N / 2th coupling coil pair serves as the input end of the variable impedance converter; the second end of the first coupling coil in the Nth coupling coil pair serves as the output end of the variable impedance converter.

[0018] Preferably, the performance of the i-th coupled coil pair and the (N+1-i)-th coupled coil pair are completely the same.

[0019] Preferably, the even-mode impedance of the i-th coupling coil pair is equal to the even-mode impedance of the N+1-i-th coupling coil pair;

[0020] The odd-mode impedance of the i-th coupled coil pair is equal to the odd-mode impedance of the N+1-i-th coupled coil pair;

[0021] The electrical length of the i-th coupled coil pair is equal to the electrical length of the (N+1-i)-th coupled coil pair.

[0022] Preferably, the even-mode impedance of the i-th coupling coil pair is equal to the even-mode impedance of the N+1-i-th coupling coil pair;

[0023] The ratio of the odd-mode impedance of the i-th coupled coil pair to the odd-mode impedance of the N+1-i-th coupled coil pair is 2:17;

[0024] The ratio of the electrical length of the i-th coupling coil pair to the electrical length of the (N+1-i)-th coupling coil pair is 1:5.

[0025] Preferably, each coupling coil pair is composed of two dielectric layers stacked up and down, and a metal wiring layer and a connecting hole are provided in each dielectric layer;

[0026] The first dielectric layer in each coupling coil pair serves as the first coupling coil in the coupling coil pair, and the second dielectric layer serves as the second coupling coil in the coupling coil pair.

[0027] Preferably, the common terminal of the variable impedance converter is grounded.

[0028] Preferably, the common end of the variable impedance converter is connected to the positive electrode of the decoupling capacitor, the negative electrode of the decoupling capacitor is grounded, and the positive electrode of the decoupling capacitor is connected to a power supply.

[0029] Preferably, when N is 2,

[0030] The input coupling unit consists of a first coupling coil pair;

[0031] The output coupling unit consists of a second coupling coil pair;

[0032] The second end of the first coupling coil in the first coupling coil pair is connected to the first end of the first coupling coil in the second coupling coil pair; the second end of the second coupling coil in the first coupling coil pair is connected to the first end of the second coupling coil in the second coupling coil pair;

[0033] The first end of the first coupling coil in the first coupling coil pair is connected to the second end of the second coupling coil in the second coupling coil pair; the first end of the second coupling coil in the first coupling coil pair serves as a common end of the variable impedance transformer;

[0034] The second end of the first coupling coil in the first coupling coil pair serves as the input end of the variable impedance converter; the second end of the first coupling coil in the second coupling coil pair serves as the output end of the variable impedance converter.

[0035] Preferably, the even-mode impedance of the first coupled coil pair is equal to the even-mode impedance of the second coupled coil pair;

[0036] The odd-mode impedance of the first coupled coil pair is equal to the odd-mode impedance of the second coupled coil pair;

[0037] The electrical length of the first coupled coil pair is equal to the electrical length of the second coupled coil pair.

[0038] Preferably, the even-mode impedance of the first coupled coil pair is equal to the even-mode impedance of the second coupled coil pair;

[0039] The ratio of the odd-mode impedance of the first coupled coil pair to the odd-mode impedance of the second coupled coil pair is 2:17;

[0040] The ratio of the electrical length of the first coupling coil pair to the electrical length of the second coupling coil pair is 1:5.

[0041] The present invention also provides an electronic device, comprising the variable impedance converter mentioned above.

[0042] The variable impedance converter provided by the present invention comprises an input coupling unit and an output coupling unit, wherein the input coupling unit and the output coupling unit comprise the same number of coupling coil pairs, and the coupling coil pairs are used for design, which has a simple structure, a small volume, is easy to implement and has a low cost, and because the coupling coils have a low characteristic impedance, the insertion loss of the entire device is reduced, and efficient signal transmission is achieved; the second input end of the input coupling unit is connected to the second input end of the output coupling unit, the first input end of the input coupling unit is connected to the first input end of the output coupling unit as the input end of the variable impedance converter, the first output end of the output coupling unit is used as the output end of the variable impedance converter, the second output end of the input coupling unit is used as the common end of the variable impedance converter, and the first output end of the input coupling unit is connected to the second output end of the output coupling unit , a closed-loop feedback is formed between the input coupling unit and the output coupling unit, and the coupling coil pair in the input coupling unit and the output coupling unit is used to transmit and transform the signal, and the impedance matching between the signal source and the load connected to the output end is gradually changed, which can not only enhance the accuracy of the device for input and output impedance matching, thereby realizing accurate impedance transformation, but also the closed-loop feedback design can absorb the reflected signal caused by impedance mismatch, reduce device loss, and enhance the stability of the device; in addition, by changing the odd-mode impedance, even-mode impedance and electrical length of the coupling coil pair, different impedance ratios from the input end to the output end can be achieved, and good impedance matching characteristics are achieved; in addition, the variable impedance transformer provided by the present application can maintain effective impedance transformation performance within a frequency range of 80% around the center frequency, and has good frequency response characteristics and bandwidth performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0044] Figure 1 A schematic diagram of the circuit structure of a variable impedance converter provided by the present invention;

[0045] Figure 2 A schematic diagram of the circuit structure of a second variable impedance converter provided by the present invention;

[0046] Figure 3 A schematic diagram of the circuit structure of a third variable impedance converter provided by the present invention;

[0047] Figure 4 The present invention provides a Figure 1 A schematic diagram of a curve showing a change in return loss and insertion loss of a variable impedance transformer as a function of frequency;

[0048] Figure 5 for Figure 1The structural diagram of the variable impedance converter shown in FIG. Figure 5 (a) is a 3D schematic diagram of the variable impedance transformer. Figure 5 (b) is a top view of the differential variable impedance transformer. Figure 5 (c) is a side view of the variable impedance transformer;

[0049] Figure 6 for Figure 5 The connection diagram of the variable impedance converter shown;

[0050] Figure 7 for Figure 5 A schematic diagram of a curve showing a change in return loss and insertion loss of a variable impedance transformer as a function of frequency;

[0051] Figure 8 The second method provided by the present invention Figure 1 A schematic diagram of a curve showing a change in return loss and insertion loss of a variable impedance transformer as a function of frequency;

[0052] Fig. 9 The third method provided by the present invention Figure 1 A schematic diagram of a curve showing a change in return loss and insertion loss of a variable impedance transformer as a function of frequency;

[0053] Description of the accompanying drawings: 1. Input coupling unit; 2. Output coupling unit;

[0054] 11. The first coupling coil pair; 21. The second coupling coil pair;

[0055] 111. The first coupling coil in the first coupling coil pair; 112. The second coupling coil in the first coupling coil pair; 211. The first coupling coil in the second coupling coil pair; 212. The second coupling coil in the second coupling coil pair. DETAILED DESCRIPTION

[0056] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0057] Input coupling unit;

[0058] An output coupling unit; wherein the input coupling unit and the output coupling unit include the same number of coupling coil pairs, and each coupling coil pair includes a first coupling coil and a second coupling coil;

[0059] The first input end of the input coupling unit and the first input end of the output coupling unit are connected as the input end of the variable impedance converter;

[0060] The first output end of the output coupling unit serves as the output end of the variable impedance converter;

[0061] The second input end of the input coupling unit is connected to the second input end of the output coupling unit; the first output end of the input coupling unit is connected to the second output end of the output coupling unit;

[0062] The second output terminal of the input coupling unit serves as the common terminal of the variable impedance converter.

[0063] The variable impedance converter provided by the present application includes an input coupling unit and an output coupling unit, wherein the input coupling unit and the output coupling unit include the same number of coupling coil pairs, and the coupling coil pairs are used for design, which has a simple structure, a small volume, is easy to implement and has a low cost. In addition, since the coupling coils have a lower characteristic impedance, the insertion loss of the entire device is reduced, and efficient signal transmission is achieved. A closed-loop feedback is formed between the input coupling unit and the output coupling unit, and the coupling coil pairs in the input coupling unit and the output coupling unit are used to perform transmission transformation on the signal, and the impedance matching between the signal source and the load connected to the output end is gradually changed, which can not only enhance the accuracy of the device for input and output impedance matching, thereby achieving accurate impedance transformation, but also the closed-loop feedback design can absorb the reflected signal caused by impedance mismatch, reduce device loss and enhance the stability of the device. In addition, by changing the odd-mode impedance, even-mode impedance and electrical length of the coupling coil pair, different impedance ratios from the input end to the output end can be achieved, and good impedance matching characteristics are achieved. In addition, the variable impedance converter provided by the present application can maintain effective impedance transformation performance within a frequency range of 80% around the center frequency, and has good frequency response characteristics and bandwidth performance.

[0064] Specifically, in some embodiments of the present application, the input coupling unit is composed of the 1st to N / 2nd coupling coil pairs; N is an even number;

[0065] The output coupling unit is composed of N / 2+1~N coupling coil pairs;

[0066] Among the N coupling coil pairs, each coupling coil pair includes a first coupling coil and a second coupling coil, the second end of the first coupling coil in the i-th coupling coil pair is connected to the first end of the first coupling coil in the i+1-th coupling coil pair; the second end of the second coupling coil in the i-th coupling coil pair is connected to the first end of the second coupling coil in the i+1-th coupling coil pair; ;

[0067] The first end of the first coupling coil in the first coupling coil pair is connected to the second end of the second coupling coil in the Nth coupling coil pair; the first end of the second coupling coil in the first coupling coil pair serves as a common end of the variable impedance transformer;

[0068] The second end of the first coupling coil in the N / 2th coupling coil pair serves as the input end of the variable impedance converter; the second end of the first coupling coil in the Nth coupling coil pair serves as the output end of the variable impedance converter.

[0069] Specifically, the second end of the first coupling coil in each coupling coil pair is connected to the first end of the first coupling coil in the next coupling coil pair, and the second end of the second coupling coil in each coupling coil pair is connected to the first end of the second coupling coil in the next coupling coil pair to form a chain coupling structure, the second end of the first coupling coil in the N / 2th coupling coil pair is used as the input end, and the second end of the first coupling coil in the last coupling coil pair is used as the output end, so that the first N / 2 coupling coil pairs form an input coupling unit, and the last N / 2 coupling coil pairs form an output coupling unit, and then the second end of the second coupling coil in the last coupling coil pair is connected to the first end of the first coupling coil in the first coupling coil pair to form a closed-loop feedback.

[0070] Optionally, in other embodiments of the present application, other connection modes may be adopted between the coupling coil pairs in the input coupling unit and the output coupling unit.

[0071] Specifically, the number N of the coupled coil pairs can be 2, 4, 6 or other even numbers, and the specific number needs to comprehensively consider the performance, volume and cost of the variable impedance converter. As a specific example of the present application, the number N of the coupled coil pairs is 2, and the variable impedance converter composed of 2 coupled coil pairs has both good performance and takes into account the volume and cost of the device.

[0072] Furthermore, by changing the characteristic impedance of the coupled line pair, different impedance transformation ratios from input signal to output signal can be achieved:

[0073] In some embodiments of the present application, the even-mode impedance of the i-th coupled coil pair is equal to the even-mode impedance of the N+1-i-th coupled coil pair;

[0074] The odd-mode impedance of the i-th coupled coil pair is equal to the odd-mode impedance of the N+1-i-th coupled coil pair;

[0075] The electrical length of the i-th coupled coil pair is equal to the electrical length of the (N+1-i)-th coupled coil pair.

[0076] Based on the above restrictions on the odd-mode impedance, even-mode impedance and electrical length of the coupled coil pair, the variable impedance converter provided in the present application can achieve an impedance conversion ratio of 1:2 from the input end to the output end.

[0077] In some other embodiments of the present application, the even-mode impedance of the i-th coupled coil pair is equal to the even-mode impedance of the N+1-i-th coupled coil pair;

[0078] The ratio of the odd-mode impedance of the i-th coupled coil pair to the odd-mode impedance of the N+1-i-th coupled coil pair is 2:17;

[0079] The ratio of the electrical length of the i-th coupling coil pair to the electrical length of the (N+1-i)-th coupling coil pair is 1:5.

[0080] Based on the above restrictions on the odd-mode impedance, even-mode impedance and electrical length of the coupled coil pair, the variable impedance converter provided in the present application can achieve an impedance conversion ratio of 1:3 from the input end to the output end.

[0081] In other embodiments of the present application, other impedance transformation ratios from the input end to the output end may be achieved by changing the odd-mode impedance, even-mode impedance and electrical length of the coupled coil pair.

[0082] Optionally, the common end of the variable impedance converter may be grounded, or connected to the positive electrode of a decoupling capacitor, the negative electrode of the decoupling capacitor is grounded, and the positive electrode of the decoupling capacitor is connected to a power supply.

[0083] Grounding the common end of the variable impedance converter can reduce electromagnetic interference between different ports, improve the balance of the structure, and enhance the isolation effect of differential signals and common-mode signals; connecting the common end of the variable impedance converter to the power supply and grounding it through a decoupling capacitor can not only complete the impedance transformation, but also act as a choke inductor to filter out the AC ripple of the power supply and provide a stable DC voltage.

[0084] Specifically, connecting the common end of the variable impedance converter to different loads based on different application scenarios can not only meet application requirements in different scenarios, but also simplify circuit design and layout.

[0085] Based on the variable impedance converter provided in the above embodiment, a 3D stacking packaging method is adopted in the embodiment of the present application to integrate the above variable impedance converter into a multi-layer substrate, and the multi-layer substrate is connected together by tin welding, thereby improving the space area utilization rate inside the product, reducing the electromagnetic interference and parasitic effects of complex RF components of the product, improving the flexibility of circuit design, and reducing manufacturing costs.

[0086] Specifically, the implementation method is:

[0087] Each coupling coil pair is composed of two dielectric layers stacked up and down, and each dielectric layer is provided with a metal wiring layer and a connecting hole;

[0088] The first dielectric layer in each coupling coil pair serves as the first coupling coil in the coupling coil pair, and the second dielectric layer serves as the second coupling coil in the coupling coil pair;

[0089] The second end of the first dielectric layer in the i-th coupling coil pair is connected to the first end of the first dielectric layer in the i+1-th coupling coil pair; the second end of the second dielectric layer in the i-th coupling coil pair is connected to the first end of the second dielectric layer in the i+1-th coupling coil pair; ;

[0090] The first end of the first dielectric layer in the first coupling coil pair is connected to the second end of the second dielectric layer in the Nth coupling coil pair; the first end of the second dielectric layer in the first coupling coil pair serves as a common end of the variable impedance transformer;

[0091] The second end of the first dielectric layer in the N / 2th coupling coil pair serves as the input end of the variable impedance converter; the second end of the first dielectric layer in the Nth coupling coil pair serves as the output end of the variable impedance converter.

[0092] The variable impedance converter implemented by the present application using a 3D stacking method still has a completely symmetrical structure, which improves the space area utilization of the device, reduces the size of the device, and reduces the cost of the device.

[0093] An embodiment of the present application further provides an electronic device, which includes the variable impedance converter mentioned above.

[0094] The above variable impedance converter is further explained below through multiple embodiments:

[0095] Example 1

[0096] See also Figure 1 , Figure 1 The embodiment provides a variable impedance transformer composed of two coupling coil pairs, which includes an input coupling unit 1 and an output coupling unit 2 .

[0097] The input coupling unit 1 is composed of a first coupling coil pair 11;

[0098] The output coupling unit 2 is composed of a second coupling coil pair 21;

[0099] The second end of the first coupling coil 111 in the first coupling coil pair 11 is connected to the first end of the first coupling coil 211 in the second coupling coil pair 21 as the input end P1 of the variable impedance converter;

[0100] The second end of the first coupling coil 112 in the first coupling coil pair 11 is connected to the first end of the second coupling coil 212 in the second coupling coil pair 21;

[0101] A first end of the first coupling coil 111 in the first coupling coil pair 11 is connected to a second end of the second coupling coil 212 in the second coupling coil pair 21;

[0102] The first end of the second coupling coil 112 in the first coupling coil pair 11 serves as the common end Common of the variable impedance converter;

[0103] The second end of the first coupling coil 211 in the second coupling coil pair 21 serves as the output end P2 of the variable impedance converter.

[0104] For example, in some application scenarios, the common terminal of the variable impedance converter may be grounded, such as Figure 2 As shown, such a connection method is beneficial to improving the balance of the structure and enhancing the isolation effect of differential signals and common-mode signals.

[0105] In other application scenarios, the common end can also be used as a power supply end for feeding, such as Figure 3 As shown, the common end of the variable impedance converter is connected to the positive electrode of the decoupling capacitor C1, the negative electrode of the decoupling capacitor C1 is grounded, and the positive electrode of the decoupling capacitor C1 is connected to the power supply VDD.

[0106] Based on different application scenarios, the common end of the variable impedance converter is connected to different loads, which not only meets the application requirements in different scenarios, but also simplifies the circuit design and layout.

[0107] In this embodiment, the even-mode impedance Ze of the first coupling coil pair 11 is equal to the even-mode impedance Ze of the second coupling coil pair 21;

[0108] The odd-mode impedance Zo of the first coupling coil pair 11 is equal to the odd-mode impedance Zo of the second coupling coil pair 21;

[0109] The electrical length of the first coupling coil pair 11 and the electrical length of the second coupling coil pair 21 are equal.

[0110] Based on the above restrictions on the odd-mode impedance, even-mode impedance and electrical length of the coupled coil pair, the impedance conversion ratio from the input end to the output end of the variable impedance converter provided in this embodiment is 1:2. Table 1 shows the data of the impedance conversion ratio of the variable impedance converter provided in the above embodiment changing with frequency, where freq is the operating frequency, Zin1 is the impedance of the input end of the variable impedance converter, and Zin2 is the impedance of the output end of the variable impedance converter;

[0111] Table 1

[0112] freq Zin1 Zin2 2.800GHz 28.982+j2.872 46.850+j8.753 2.900GHz 28.792+j1.995 47.029+j7.539 3.000GHz 28.536+j1.194 47.119+j6.385 3.100GHz 28.229+j0.470 47.134+j5.296 3.200GHz 27.882-j0.178 47.084+j4.274 3.300GHz 27.506-j0.752 46.980+j3.318 3.400GHz 27.110-j1.255 46.831+j2.429 3.500GHz 26.701-j1.692 46.647+j1.606 3.600GHz 26.284-j2.065 46.435+j0.847 3.700GHz 25.872-j2.379 46.202+j0.150 3.800GHz 25.462-j2.637 45.954-j0.487 3.900GHz 25.060-j0.845 45.701-j1.069 4.000GHz 24.671-j3.007 45.444-j1.596 4.100GHz 24.295-j3.124 45.189-j2.073 4.200GHz 23.936-j3.203 44.939-j2.503 4.300GHz 23.596-j3.244 44.699-j2.888 4.400GHz 23.274-j3.253 44.471-j3.233 4.500GHz 22.973-j3.230 44.260-j3.539 4.600GHz 22.694-j3.180 44.066-j3.811 4.700GHz 22.437-j3.104 43.894-j4.051 4.800GHz 22.203-j3.005 43.744-j4.262 4.900GHz 21.991-j2.883 43.619-j4.447 5.000GHz 21.804-j2.742 43.520-j4.609 5.100GHz 21.641-j2.583 43.450-j4.751 5.200GHz 21.502-j2.407 43.410-j4.876 5.300GHz 21.389-j2.215 43.401-j4.985 5.400GHz 21.301-j2.009 43.425-j5.083 5.500GHz 21.240-j1.789 43.483-j5.173 5.600GHz 21.205-j1.557 43.578-j5.256 5.700GHz 21.199-j1.314 43.709-j5.336 5.800GHz 21.221-j1.060 43.879-j5.416 5.900GHz 21.272-j0.796 44.090-j5.500 6.000GHz 21.355-j0.524 44.342-j5.591 6.100GHz 21.471-j0.243 44.638-j5.692 6.200GHz 21.621+j0.045 44.979-j5.808 6.300GHz 21.807+j0.339 45.367-j5.944 6.400GHz 22.032+j0.638 45.804-j6.104 6.500GHz 22.299+j0.941 46.292-j6.294 6.600GHz 22.611+j1.247 46.833-j6.521 6.700GHz 22.972+j1.553 47.428-j6.790 6.800GHz 23.385+j1.858 48.080-j7.111 6.900GHz 23.858+j2.158 48.790-j7.492 7.000GHz 24.395+j2.450 49.561-j7.945 7.100GHz 25.005+j2.730 50.394-j8.482 7.200GHz 25.696+j2.991 51.290-j9.118

[0113] It can be seen from the data in Table 1 that the relative bandwidth of the variable impedance converter provided in the present application reaches 80%, which indicates that the variable impedance converter provided in the present application can achieve an impedance conversion ratio of 1:2 within a wider frequency range and has better practicality and practical value.

[0114] See also Figure 4 , Figure 4 For the above embodiment provided Figure 1 The variable impedance transformer shown is a schematic diagram of the change curve of its return loss and insertion loss with frequency when achieving an impedance transformation ratio of 1:2. It can be seen from the figure that in the frequency range of 3GHz~7GHz, the return loss S11 of the variable impedance transformer is less than -20dB, and the insertion loss S21 is close to 0dB.

[0115] Example 2

[0116] Based on the variable impedance converter provided in the above embodiment 1, the variable impedance converter is integrated into a multi-layer substrate by using a 3D stacking packaging method in this embodiment, and the multi-layer substrate is connected together by using a tin soldering method, such as Figure 5 The figure shows the structure diagram of the prepared variable impedance converter, wherein: Figure 5 (a) shows the 3D structure diagram of the prepared variable impedance transformer. Figure 5 (b) and Figure 5 (c) in the figure shows the top view and side view of the variable impedance transformer respectively.

[0117] Specifically, see Figure 6 , Figure 6 for Figure 5 The specific connection diagram of the variable impedance converter shown is as follows:

[0118] The first coupling coil pair 11 is composed of two dielectric layers M2 and M4 stacked up and down, wherein M2 serves as the first coupling coil 111 in the first coupling coil pair 11; M4 serves as the second coupling coil 112 in the first coupling coil pair 11;

[0119] The second coupling coil pair 21 is composed of two dielectric layers M3 and M5 stacked up and down, wherein M3 serves as the first coupling coil 211 in the second coupling coil pair 21; M5 serves as the second coupling coil 212 in the second coupling coil pair 21;

[0120] The first end of the dielectric layer M2 is connected to the second end of the dielectric layer M5 through a connecting hole; the second end of the dielectric layer M2 is connected to the first end of the dielectric layer M3 through a connecting hole as the input end P1 of the variable impedance transformer; the second end of the dielectric layer M3 serves as the output end P2 of the variable impedance transformer; the first end of the dielectric layer M4 serves as the common end of the variable impedance transformer; the second end of the dielectric layer M4 is connected to the first end of the dielectric layer M5 through a connecting hole.

[0121] Specifically, the variable impedance converter provided in the embodiment of the present application is formed by stacking multiple dielectric layers, which not only takes into account the small size and low cost, but also improves the bandwidth of the device.

[0122] The structure in this embodiment is used to achieve Figure 5 The size of the variable impedance transformer shown is approximately 0.98mm*0.83mm, while the structural size of the existing smaller variable impedance transformer is approximately 2mm*2mm. It can be seen that the area of ​​the variable impedance transformer formed by stacking the multi-layer dielectric layers provided in the embodiment of the present application can be reduced by 80%, and the cost is lower.

[0123] See also Figure 7 , Figure 7 Provided in the embodiments of this application Figure 5 The diagram shows a curve diagram of the change of return loss and insertion loss of the variable impedance transformer with frequency. It can be seen from the figure that in the frequency range of 3GHz~7GHz, the variable impedance transformer has a higher return loss and a lower insertion loss.

[0124] Table 2 shows the data of the impedance transformation ratio of the variable impedance converter provided by the above embodiment changing with the frequency, wherein freq is the operating frequency, Zin1 is the impedance of the input end of the variable impedance converter, and Zin2 is the impedance of the output end of the variable impedance converter;

[0125] Table 2

[0126] freq Zin1 Zin2 2.800GHz 30.073+j3.631 44.395+j9.138 2.900GHz 29.950+j2.767 44.617+j8.175 3.000GHz 29.764+j1.968 44.777+j7.257 3.100GHz 29.527+j1.234 44.883+j6.384 3.200GHz 29.249+j0.563 44.943+j5.556 3.300GHz 28.937-j0.043 44.962+j4.774 3.400GHz 28.600-j0.589 44.948+j4.037 3.500GHz 28.244-j1.076 44.906+j3.345 3.600GHz 27.875-j1.506 44.840+j2.695 3.700GHz 27.499-j1.884 44.754+j2.088 3.800GHz 27.119-j2.211 44.655+j1.521 3.900GHz 26.740-j2.491 44.544+j0.993 4.000GHz 26.364-j2.727 44.425+j0.503 4.100GHz 25.994-j2.922 44.302+j0.047 4.200GHz 25.633-j3.079 44.177-j0.374 4.300GHz 25.281-j3.200 44.052-j0.763 4.400GHz 24.942-j3.288 43.931-j1.122 4.500GHz 24.615-j3.345 43.814-j1.452 4.600GHz 24.302-j3.374 43.705-j1.754 4.700GHz 24.003-j3.377 43.604-j2.034 4.800GHz 23.721-j3.355 43.514-j2.289 4.900GHz 23.453-j3.311 43.435-j2.522 5.000GHz 23.203-j3.245 43.369-j2.735 5.100GHz 22.968-j3.160 43.318-j2.930 5.200GHz 22.751-j3.057 43.282-j3.108 5.300GHz 22.551-j2.936 43.262-j3.270 5.400GHz 22.368-j2.800 43.260-j3.419 5.500GHz 22.203-j2.649 43.276-j3.554 5.600GHz 22.056-j2.484 43.312-j3.682 5.700GHz 21.926-j2.306 43.368-j3.799 5.800GHz 21.814-j2.116 43.445-j3.909 5.900GHz 21.721-j1.914 43.543-j4.014 6.000GHz 21.646-j1.701 43.665-j4.114 6.100GHz 21.589-j1.477 43.809-j4.211 6.200GHz 21.552-j1.244 43.977-j4.308 6.300GHz 21.534-j1.001 44.170-j4.406 6.400GHz 21.535-j0.749 44.388-j4.507 6.500GHz 21.556-j0.488 44.632-j4.613 6.600GHz 21.598-j0.219 44.903-j4.725 6.700GHz 21.661+j0.058 45.200-j4.847 6.800GHz 21.746+j0.343 45.525-j4.980 6.900GHz 21.853+j0.635 45.878-j5.126 7.000GHz 21.984+j0.934 46.259-j5.288 7.100GHz 22.138+j1.239 46.669-j5.470

[0127] It can be seen from the data in Table 2 that the variable impedance transformer formed by stacking multiple layers of substrates provided in the present application can still achieve an impedance transformation ratio of 1:2 within a wider frequency range, and has better practicality and practical value.

[0128] Example 3

[0129] This embodiment provides a variable impedance converter consisting of two coupled coil pairs, such as Figure 1 As shown, it comprises an input coupling unit 1 and an output coupling unit 2 .

[0130] The input coupling unit 1 is composed of a first coupling coil pair 11;

[0131] The output coupling unit 2 is composed of a second coupling coil pair 21;

[0132] The second end of the first coupling coil 111 in the first coupling coil pair 11 is connected to the first end of the first coupling coil 211 in the second coupling coil pair 21 as the input end P1 of the variable impedance converter;

[0133] The second end of the first coupling coil 112 in the first coupling coil pair 11 is connected to the first end of the second coupling coil 212 in the second coupling coil pair 21;

[0134] A first end of the first coupling coil 111 in the first coupling coil pair 11 is connected to a second end of the second coupling coil 212 in the second coupling coil pair 21;

[0135] The first end of the second coupling coil 112 in the first coupling coil pair 11 serves as the common end Common of the variable impedance converter;

[0136] The second end of the first coupling coil 211 in the second coupling coil pair 21 serves as the output end P2 of the variable impedance converter.

[0137] For example, in some application scenarios, the common terminal of the variable impedance converter may be grounded, such as Figure 2 As shown, such a connection method is beneficial to improving the balance of the structure and enhancing the isolation effect of differential signals and common-mode signals.

[0138] In other application scenarios, the common end can also be used as a power supply end for feeding, such as Figure 3 As shown, the common end of the variable impedance converter is connected to the positive electrode of the decoupling capacitor C1, the negative electrode of the decoupling capacitor C1 is grounded, and the positive electrode of the decoupling capacitor C1 is connected to the power supply VDD.

[0139] Based on different application scenarios, the common end of the variable impedance converter is connected to different loads, which not only meets the application requirements in different scenarios, but also simplifies the circuit design and layout.

[0140] In this embodiment, the even-mode impedance Ze of the first coupling coil pair 11 is equal to the even-mode impedance Ze of the second coupling coil pair 12;

[0141] The ratio of the odd-mode impedance Zo of the first coupling coil pair 11 to the odd-mode impedance Zo of the second coupling coil pair 12 is 2:17;

[0142] The ratio of the electrical length of the first coupling coil pair 11 to the electrical length of the second coupling coil pair 12 is 1:5.

[0143] For example, the even-mode impedance Ze of the first coupling coil pair 11 and the second coupling coil pair 12 are both 225Ohm; the odd-mode impedance Zo of the first coupling coil pair 11 is 2Ohm, and the odd-mode impedance Zo of the second coupling coil pair 12 is 17Ohm; the electrical length of the first coupling coil 11 is 1, and the electrical length of the second coupling coil pair 12 is 5.

[0144] Table 3 shows the data of the impedance transformation ratio of the variable impedance converter provided by the above embodiment changing with the frequency, wherein freq is the operating frequency, Zin1 is the impedance of the input end of the variable impedance converter, and Zin2 is the impedance of the output end of the variable impedance converter;

[0145] Table 3

[0146] freq Zin1 Zin2 2.500GHz 19.096+j0.108 41.032+j6.312 2.600GHz 18.846-j0.436 41.132+j5.510 2.700GHz 18.565-j0.921 41.188+j4.756 2.800GHz 18.262-j1.348 41.207+j4.049 2.900GHz 17.944-j1.721 41.196+j3.389 3.000GHz 17.617-j2.043 41.160+j2.772 3.100GHz 17.285-j2.317 41.105+j2.199 3.200GHz 16.954-j2.548 41.034+j1.665 3.300GHz 16.626-j2.738 40.951+j1.171 3.400GHz 16.304-j2.891 40.860+j0.713 3.500GHz 15.989-j3.011 40.765+j0.289 3.600GHz 15.685-j3.100 40.668-j0.101 3.700GHz 15.391-j3.161 40.571-j0.462 3.800GHz 15.110-j3.196 40.477-j0.793 3.900GHz 14.840-j3.208 40.388-j1.098 4.000GHz 14.584-j3.199 40.306-j1.378 4.100GHz 14.342-j3.171 40.232-j1.634 4.200GHz 14.113-j3.126 40.168-j1.870 4.300GHz 13.898-j3.065 40.115-j2.086 4.400GHz 13.696-j2.989 40.076-j2.284 4.500GHz 13.509-j2.900 40.049-j2.466 4.600 GHz 13.335-j2.799 40.038-j2.634 4.700 GHz 13.175-j2.687 40.043-j2.789 4.800 GHz 13.028-j2.565 40.064-j2.933 4.900 GHz 12.895-j2.434 40.103-j3.067 5.000 GHz 12.775-j2.294 40.160-j3.194 5.100 GHz 12.668-j2.146 40.237-j3.316 5.200 GHz 12.575-j1.991 40.333-j3.432 5.300 GHz 12.495-j1.828 40.449-j3.546 5.400 GHz 12.428-j1.659 40.587-j3.660 5.500 GHz 12.374-j1.484 40.746-j3.774 5.600 GHz 12.333-j1.303 40.927-j3.892 5.700 GHz 12.306-j1.117 41.130-j4.014 5.800 GHz 12.292-j0.926 41.356-j4.142 5.900 GHz 12.291-j0.729 41.605-j4.280 6.000 GHz 12.304-j0.528 41.878-j4.429 6.100 GHz 12.332-j0.322 42.174-j4.591 6.200 GHz 12.374-j0.111 42.493-j4.769 6.300 GHz 12.430+j0.103 42.835-j4.965 6.400 GHz 12.502+j0.322 43.201-j5.181 6.500 GHz 12.589+j0.545 43.589-j5.422 6.600 GHz 12.693+j0.771 43.999-j5.689 6.700 GHz 12.814+j1.001 44.431-j5.985 6.800 GHz 12.952+j1.235 44.882-j6.314 6.900 GHz 13.109+j1.471 45.353-j6.679 7.000 GHz 13.285+j1.710 45.840-j7.083 7.100 GHz 13.482+j1.952 46.343-j7.530 7.200 GHz 13.700+j2.196 46.858-j8.024 7.300 GHz 13.942+j2.442 47.382-j8.567 7.400 GHz 14.208+j2.689 47.912-j9.163 7.500 GHz 14.499+j2.936 48.448-j9.817

[0147] It can be seen from the data in Table 3 that by changing the odd-mode impedance, even-mode impedance and electrical length of the first coupling coil pair and the second coupling coil pair, the variable impedance transformer provided by the present application can achieve an impedance transformation ratio of 1:3 within a wider frequency range, and has better practicality and practical value.

[0148] See also Figure 8 , Figure 8 For the above embodiment provided Figure 1 The variable impedance transformer shown is a schematic diagram of a curve showing changes in return loss and insertion loss with frequency when achieving an impedance transformation ratio of 1:3. It can be seen from the figure that within the frequency range of 3GHz~7GHz, the return loss S11 of the variable impedance transformer fluctuates around -20dB, and the insertion loss S21 is close to 0dB, indicating that the variable impedance transformer provided in the present application still has lower return loss and insertion loss when achieving an impedance transformation ratio of 1:3.

[0149] Example 4

[0150] This embodiment provides a variable impedance converter consisting of two coupled coil pairs, such as Figure 1 As shown, it comprises an input coupling unit 1 and an output coupling unit 2 .

[0151] The input coupling unit 1 is composed of a first coupling coil pair 11;

[0152] The output coupling unit 2 is composed of a second coupling coil pair 21;

[0153] The second end of the first coupling coil 111 in the first coupling coil pair 11 is connected to the first end of the first coupling coil 211 in the second coupling coil pair 21 as the input end P1 of the variable impedance converter;

[0154] The second end of the first coupling coil 112 in the first coupling coil pair 11 is connected to the first end of the second coupling coil 212 in the second coupling coil pair 21;

[0155] A first end of the first coupling coil 111 in the first coupling coil pair 11 is connected to a second end of the second coupling coil 212 in the second coupling coil pair 21;

[0156] The first end of the second coupling coil 112 in the first coupling coil pair 11 serves as the common end Common of the variable impedance converter;

[0157] The second end of the first coupling coil 211 in the second coupling coil pair 21 serves as the output end P2 of the variable impedance converter.

[0158] For example, in some application scenarios, the common terminal of the variable impedance converter may be grounded, such as Figure 2 As shown, such a connection method is beneficial to improving the balance of the structure and enhancing the isolation effect of differential signals and common-mode signals.

[0159] In other application scenarios, the common end can also be used as a power supply end for feeding, such as Figure 3 As shown, the common end of the variable impedance converter is connected to the positive electrode of the decoupling capacitor C1, the negative electrode of the decoupling capacitor C1 is grounded, and the positive electrode of the decoupling capacitor C1 is connected to the power supply VDD.

[0160] Based on different application scenarios, the common end of the variable impedance converter is connected to different loads, which not only meets the application requirements in different scenarios, but also simplifies the circuit design and layout.

[0161] In this embodiment, by changing the odd-mode impedance, even-mode impedance and electrical length of the first coupling coil pair and the second coupling coil pair, an impedance transformation ratio of 1:4 is achieved. Table 4 shows the impedance transformation ratio of the variable impedance transformer with frequency when the impedance transformation ratio of 1:4 is achieved, where freq is the operating frequency, Zin1 is the impedance of the input end of the variable impedance transformer, and Zin2 is the impedance of the output end of the variable impedance transformer;

[0162] Table 4

[0163] freq Zin1 Zin2 2.500 GHz 13.721+j3.567 28.734+j9.780 2.600 GHz 13.779+j3.131 29.200+j9.354 2.700 GHz 13.794+j2.713 29.644+j8.930 2.800 GHz 13.771+j2.316 30.069+j8.509 2.900 GHz 13.714+j1.942 30.477+j8.090 3.000 GHz 13.628+j1.591 30.870+j7.671 3.100 GHz 13.517+j1.265 31.250+j7.252 3.200 GHz 13.383+j0.963 31.618+j6.833 3.300 GHz 12.232+j0.687 31.975+j6.411 3.400 GHz 13.065+j0.434 32.321+j5.986 3.500 GHz 12.885+j0.206 32.658+j5.558 3.600 GHz 12.694+j3.478 32.987+j5.125 3.700 GHz 12.496-j0.183 33.307+j4.687 3.800 GHz 12.291-j0.344 33.618+j4.243 3.900 GHz 12.082-j0.486 33.921+j3.791 4.000 GHz 11.870-j0.608 34.215+j3.332 4.100 GHz 11656-j0.711 34.501+j2.864 4.200 GHz 11.441-j0.797 34.778+j2.387 4.300 GHz 11.226-j0.847 35.046+j1.900 4.400 GHz 11.013-j0.921 35.303+j1.403 4.500 GHz 10.801-j0.961 35.551+j0.896 4.600 GHz 10.592-j0.987 35.787+j0.377 4.700 GHz 10.386-j1.000 36.011-j0.152 4.800 GHz 10.183-j1.001 36.223-j0.694 4.900 GHz 9.983-j0.992 36.421-j1.247 5.000 GHz 9.787-j0.972 36.605-j1.811 5.100 GHz 9.596-j0.942 36.774-j2.387 5.200 GHz 9.409-j0.903 36.927-j2.975 5.300 GHz 9.226-j0.856 37.062-j3.574 5.400 GHz 9.047-j0.801 37.178-j4.183 5.500 GHz 8.873-j0.738 37.275-j4.803 5.600 GHz 8.704-j0.669 37.352-j5.432 5.700 GHz 8.539-j0.593 37.408-j6.071 5.800 GHz 8.379-j0.511 37.441-j6.717 5.900 GHz 8.223-j0.424 37.450-j7.371 6.000 GHz 8.071-j0.332 37.436-j8.030 6.100 GHz 7.924-j0.234 37.396-j8.695 6.200 GHz 7.781-j0.133 37.330-j9.363 6.300 GHz 7.643-j0.026 37.239-j10.033 6.400 GHz 7.509+j0.084 37.120-j10.705 6.500 GHz 7.378+j0.197 36.974-j11.375 6.600 GHz 7.252+j0.315 36.800-j12.043 6.700 GHz 7.130+j0.435 36.598-j12.707 6.800 GHz 7.011+j0.559 36.369-j13.366 6.900 GHz 6.897+j0.686 36.112-j14.017 7.000 GHz 6.785+j0.815 35.827-j14.658 7.100 GHz 6.678+j0.947 35.515-j15.290 7.200 GHz 6.574+j1.082 35.177-j15.908 7.300 GHz 6.473+j1.218 34.814-j16.513 7.400 GHz 6.376+j1.358 34.425-j17.101 7.500 GHz 6.281+j1.499 34.013-j17.673

[0164] It can be seen from the data in Table 4 that by changing the odd-mode impedance, even-mode impedance and electrical length of the first coupling coil pair and the second coupling coil pair, the variable impedance transformer provided by the present application can also achieve an impedance transformation ratio of 1:4 within a wider frequency range.

[0165] See also Figure 9 , Figure 9 For the above embodiment provided Figure 1 The variable impedance transformer shown is a schematic diagram of a curve showing changes in return loss and insertion loss with frequency when achieving an impedance transformation ratio of 1:4. It can be seen from the figure that within the frequency range of 3GHz~7GHz, the return loss S11 of the variable impedance transformer also fluctuates around -20dB, and the insertion loss S21 is close to 0dB, indicating that the variable impedance transformer provided in the present application still has lower return loss and insertion loss when achieving an impedance transformation ratio of 1:4.

[0166] It can be seen from the above-mentioned Examples 1 to 4 that when the number N of coupling coil pairs is 2, the designed variable impedance converter has a compact structure, is easy to implement and integrate, and because of the fewer components, it is relatively easy to adjust and optimize the physical parameters of the coupling coils; by adjusting the odd-mode impedance, even-mode impedance and electrical length of the two coupling coil pairs, different impedance transformation ratios from the input end to the output end can be achieved within a wider frequency range, while also having lower return loss and insertion loss, which is practical and valuable and can be used in various scenarios with different impedance transformation ratios; in addition, fewer coupling coil pairs also means that the path through which the signal passes is shorter, thereby reducing insertion loss and signal attenuation, and reducing intermodulation interference and cross-coupling effects caused by complex structures; therefore, a variable impedance converter consisting of only two coupling coil pairs has better characteristics and wider applicability than a variable impedance converter consisting of more coupling coil pairs.

[0167] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A variable impedance converter, characterized in that: include: Input coupling unit; An output coupling unit; wherein the input coupling unit and the output coupling unit include the same number of coupling coil pairs, each coupling coil pair including a first coupling coil and a second coupling coil; The first input end of the input coupling unit and the first input end of the output coupling unit are connected as the input end of the variable impedance converter; The first output end of the output coupling unit serves as the output end of the variable impedance converter; The second input end of the input coupling unit is connected to the second input end of the output coupling unit; the first output end of the input coupling unit is connected to the second output end of the output coupling unit; The second output terminal of the input coupling unit serves as a common terminal of the variable impedance converter; The input coupling unit is composed of the 1st to N / 2nd coupling coil pairs; N is an even number; The output coupling unit is composed of N / 2+1~N coupling coil pairs; Among the N coupling coil pairs, each coupling coil pair includes a first coupling coil and a second coupling coil, the second end of the first coupling coil in the i-th coupling coil pair is connected to the first end of the first coupling coil in the i+1-th coupling coil pair; the second end of the second coupling coil in the i-th coupling coil pair is connected to the first end of the second coupling coil in the i+1-th coupling coil pair; ; The first end of the first coupling coil in the first coupling coil pair is connected to the second end of the second coupling coil in the Nth coupling coil pair; the first end of the second coupling coil in the first coupling coil pair serves as a common end of the variable impedance transformer; The second end of the first coupling coil in the N / 2th coupling coil pair serves as the input end of the variable impedance converter; the second end of the first coupling coil in the Nth coupling coil pair serves as the output end of the variable impedance converter.

2. The variable impedance converter according to claim 1, characterized in that: The performance of the i-th coupled coil pair and the N+1-i-th coupled coil pair are exactly the same.

3. The variable impedance converter according to claim 2, characterized in that: The even-mode impedance of the i-th coupled coil pair is equal to the even-mode impedance of the N+1-i-th coupled coil pair; The odd-mode impedance of the i-th coupled coil pair is equal to the odd-mode impedance of the N+1-i-th coupled coil pair; The electrical length of the i-th coupled coil pair is equal to the electrical length of the (N+1-i)-th coupled coil pair.

4. The variable impedance converter according to claim 1, characterized in that: The even-mode impedance of the i-th coupled coil pair is equal to the even-mode impedance of the N+1-i-th coupled coil pair; The ratio of the odd-mode impedance of the i-th coupled coil pair to the odd-mode impedance of the N+1-i-th coupled coil pair is 2:17; The ratio of the electrical length of the i-th coupling coil pair to the electrical length of the (N+1-i)-th coupling coil pair is 1:

5.

5. The variable impedance converter according to claim 1, characterized in that: Each coupling coil pair is composed of two dielectric layers stacked up and down, and each dielectric layer is provided with a metal wiring layer and a connecting hole; The first dielectric layer in each coupling coil pair serves as the first coupling coil in the coupling coil pair, and the second dielectric layer serves as the second coupling coil in the coupling coil pair.

6. The variable impedance converter according to claim 1, characterized in that: The common terminal of the variable impedance converter is grounded.

7. The variable impedance converter according to claim 1, characterized in that: The common end of the variable impedance converter is connected to the positive electrode of the decoupling capacitor, the negative electrode of the decoupling capacitor is grounded, and the positive electrode of the decoupling capacitor is connected to a power supply.

8. The variable impedance converter according to claim 1, characterized in that: When N is 2, The input coupling unit consists of a first coupling coil pair; The output coupling unit consists of a second coupling coil pair; The second end of the first coupling coil in the first coupling coil pair is connected to the first end of the first coupling coil in the second coupling coil pair; the second end of the second coupling coil in the first coupling coil pair is connected to the first end of the second coupling coil in the second coupling coil pair; The first end of the first coupling coil in the first coupling coil pair is connected to the second end of the second coupling coil in the second coupling coil pair; the first end of the second coupling coil in the first coupling coil pair serves as a common end of the variable impedance transformer; The second end of the first coupling coil in the first coupling coil pair serves as the input end of the variable impedance converter; the second end of the first coupling coil in the second coupling coil pair serves as the output end of the variable impedance converter.

9. The variable impedance converter according to claim 8, characterized in that: The even-mode impedance of the first coupled coil pair is equal to the even-mode impedance of the second coupled coil pair; The odd-mode impedance of the first coupled coil pair is equal to the odd-mode impedance of the second coupled coil pair; The electrical length of the first coupled coil pair is equal to the electrical length of the second coupled coil pair.

10. The variable impedance converter according to claim 8, characterized in that: The even-mode impedance of the first coupled coil pair is equal to the even-mode impedance of the second coupled coil pair; The ratio of the odd-mode impedance of the first coupled coil pair to the odd-mode impedance of the second coupled coil pair is 2:17; The ratio of the electrical length of the first coupling coil pair to the electrical length of the second coupling coil pair is 1:

5.

11. An electronic device, characterized in that: The invention comprises the variable impedance converter as described in any one of claims 1 to 10.

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