Cascade voltage doubling rectifying circuit

Abstract

The invention provides a cascade voltage-multiplying rectifying circuit which comprises a primary voltage-multiplying circuit and at least one secondary voltage-multiplying circuit which are cascaded, and blocking capacitors are connected between the primary voltage-multiplying circuit and the secondary voltage-multiplying circuit which are adjacent and between the adjacent secondary voltage-multiplying circuits; the input end of the first-stage voltage doubling circuit receives input voltage provided by external equipment, and the output end of the last-stage secondary voltage doubling circuit is connected with a load resistor. The first-stage voltage doubling circuit comprises a first-stage microstrip line matching circuit, a micro-strip, a capacitor, a diode, a first-stage harmonic suppression circuit and a first-stage microstrip transmission line filter circuit. According to the technical scheme of the invention, the problem that the direct application requirement of a terminal cannot be met due to the low output voltage of a rectification circuit under the condition of input power in the prior art can be solved. The voltage requirement of the power utilization terminal in a low-power-density receiving energy transmission system is effectively met, and the low-power-density receiving energy transmission system can be widely applied to the aspects of wireless sensor networks, wireless energy collection, novel energy-carrying communication systems and the like in the field of spaceflight, military and civil wireless communication.

Description

Technical Field

[0001] The invention belongs to the field of microwave rectification, and in particular relates to a cascade voltage doubler rectification circuit. Background Art

[0002] The microwave rectifier circuit is a key part in the microwave wireless energy transmission system. It can convert the microwave signal transmitted from the antenna to the receiving antenna into DC power through the rectifier circuit. In the microwave wireless power transmission system and / or energy harvesting system, the rectifier circuit is the main component of the energy receiving end, and its efficiency is crucial. The microwave rectifier is generally composed of an input filter, an impedance matching network, a rectifier diode, an output filter and a DC load. At present, the receiving power density of most practical energy transmission systems is low, and the input power of the rectifier circuit is low. However, for practical applications such as low-power sensor networks, the power terminal requires a higher output voltage to match the load. Usually, in order to increase the output voltage, a voltage doubler circuit or a DC-DC conversion circuit is used. However, the conversion efficiency of the ordinary cascade voltage doubler rectifier circuit is low; and the DC-DC conversion circuit increases the circuit complexity on the one hand, and also loses some efficiency on the other. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a cascade voltage doubler rectifier circuit to solve the problem that the conversion efficiency of ordinary cascade voltage doubler rectifier circuits in the prior art is low, and the DC-DC conversion circuit increases the circuit complexity on the one hand, and also loses some efficiency on the other hand.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems: a cascade voltage doubler rectifier circuit, comprising a cascaded multi-stage voltage doubler rectifier circuit, wherein the multi-stage voltage doubler rectifier circuit comprises a cascaded first-stage voltage doubler circuit and at least one secondary voltage doubler circuit, and a DC blocking capacitor C is connected between adjacent first-stage voltage doubler circuits and secondary voltage doubler circuits and between adjacent secondary voltage doubler circuits. DC .

[0005] The input end of the first-stage voltage doubler circuit receives the input voltage provided by the external device, and the output end of the last-stage secondary voltage doubler circuit is connected to the load resistor R.

[0006] The first-stage voltage doubling circuit comprises a first-stage microstrip line matching circuit, a capacitor C1, diodes D1 and D2, a first-stage harmonic suppression circuit and a first-stage microstrip transmission line filtering circuit, wherein:

[0007] One end of the matching circuit is connected to the input end, and the other end is connected to the capacitor C1. The other end of the capacitor C1 is connected to the positive electrode of the diode D2 through the microstrip W1. The negative electrode of the diode D2 is connected to the first-stage microstrip transmission line filter circuit. The other end of the first-stage microstrip transmission line filter circuit is connected to the secondary voltage doubler circuit.

[0008] One end of the first-stage harmonic suppression circuit is grounded, and the other end is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the anode of the diode D2.

[0009] The secondary voltage doubler circuit comprises a capacitor, a microstrip, two diodes, a secondary harmonic suppression circuit and a secondary microstrip transmission line filter circuit, and the connection relationship is the same as that of the primary voltage doubler circuit.

[0010] One end of the capacitor of the secondary voltage doubler circuit is connected to the output end of the primary voltage doubler circuit, and the output end of the secondary microstrip transmission line filter circuit of the secondary voltage doubler circuit is connected to the output end of the primary microstrip transmission line filter circuit.

[0011] The microstrip line matching circuit is used for impedance matching, so that the rectified input power can be fed into the circuit with maximum low reflection.

[0012] Due to the nonlinear effect of the diode, secondary and tertiary harmonics will be generated during the rectification process. The harmonic suppression circuit is used to reflect the harmonics back to the diode for rectification again, thereby improving efficiency.

[0013] The microstrip transmission line filter circuit is used to filter out radio frequency components, and only direct current can pass through to obtain a rectified direct current output.

[0014] The present invention also includes the following technical features:

[0015] The matching circuit includes a microstrip line W101 and a microstrip line W102, one end of the microstrip line W101 is connected to the input port of the voltage doubler rectifier circuit, and the other end is connected to one end of the microstrip line W102, the other end of the microstrip line W102 is connected to one end of the microstrip line W1 via a capacitor C1, and the other end of the microstrip line W1 is connected to the positive electrode of the diode D2.

[0016] The microstrip line W101 is a transmission line, and the microstrip line W102 is an open line.

[0017] The first-stage harmonic suppression circuit is a microstrip line W02, one end of the microstrip line W02 is connected to the anode of the diode D1, and the other end is grounded, and the cathode of the diode D1 is connected to the anode of the diode D2.

[0018] The length of the microstrip line W02 is one eighth of the wavelength of the operating frequency of the rectifier circuit.

[0019] The first-stage microstrip transmission line filter circuit includes a microstrip transmission line W03 and a microstrip transmission line W04 connected in sequence, one end of the microstrip transmission line W03 is connected to the cathode of the diode D2, and the other end is connected to the microstrip transmission line W04, and the other end of the microstrip transmission line W04 is connected to the microstrip transmission line W07.

[0020] The end of the microstrip transmission line W03 connected to the microstrip transmission line W04 is also connected to the microstrip transmission line W05 and the microstrip transmission line W06 respectively.

[0021] The microstrip transmission line W05, microstrip transmission line W06 and microstrip transmission line W07 are open lines.

[0022] The lengths of the microstrip transmission lines W03 and W04 are one quarter of the wavelength of the operating frequency of the rectifier circuit; the open-circuit microstrip transmission lines W05, W06 and W07 are one quarter, one eighth and one twelfth of the wavelength of the operating frequency of the rectifier circuit respectively.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] (I) The cascade voltage doubler rectifier circuit provided by the present invention aims at the problem that the output voltage of the rectifier circuit in the existing technology is low under the input power condition and cannot meet the direct application requirements of the terminal, and the traditional voltage doubler circuit has low efficiency and the DC conversion circuit is complex and also affects the efficiency. A cascade voltage doubler rectifier circuit is proposed. Through the circuit topology design, the high efficiency and high output voltage of the rectifier circuit are achieved under low input power, which effectively solves the voltage requirements of the power terminal in the low power density receiving energy transmission system, and can be widely used in wireless sensor networks, wireless energy collection and new energy-carrying communication systems in the fields of aerospace, military and civil wireless communications.

[0025] (II) The cascade voltage doubler rectifier circuit provided by the present invention adopts a circuit topology with DC isolation between different stages to solve the cascade problem of the voltage doubler circuit. It ensures that the transmission characteristics of each stage of the rectifier circuit remain unchanged, has the same conversion efficiency as the single-stage rectifier circuit, and achieves a high output voltage under the premise of high rectification efficiency. It can be effectively applied to the power terminal in the low power density receiving energy transmission system, eliminating the DC conversion link and simplifying the circuit structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a circuit module structure diagram of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of the first-stage voltage doubling circuit of the present invention.

[0028] Figure 3 It is a schematic diagram of the circuit structure of embodiment 2 of the present invention.

[0029] Figure 4 Schematic diagram of the circuit structure when it includes two secondary voltage doubling circuits.

[0030] FIG5( a ) is a diagram showing the simulation results of a single-stage voltage doubler rectifier circuit.

[0031] FIG5( b ) is a diagram showing the simulation results of a two-stage voltage doubler rectifier circuit.

[0032] FIG5(c) is a diagram showing the simulation results of Example 2 of the present invention.

[0033] The numbers in the figure represent:

[0034] 1-First stage voltage doubler circuit, 2-Second stage voltage doubler circuit,

[0035] 1-1-First stage microstrip line matching circuit, 1-2-First stage harmonic suppression circuit, 1-3-First stage microstrip transmission line filtering circuit.

[0036] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0037] All components in the present invention, unless otherwise specified, are components known in the prior art.

[0038] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0039] Embodiment 1:

[0040] This embodiment provides a cascade voltage doubler rectifier circuit, such as Figure 1 As shown in FIG5 , a cascaded multi-stage voltage doubler rectifier circuit is provided, wherein the multi-stage voltage doubler rectifier circuit includes a cascaded primary voltage doubler circuit 1 and at least one secondary voltage doubler circuit 2, and a DC blocking capacitor C is connected between adjacent primary voltage doubler circuits 1 and secondary voltage doubler circuits 2 and between adjacent secondary voltage doubler circuits 2. DC .

[0041] The input end of the first-stage voltage doubler circuit 1 receives the input voltage provided by an external device, and the output end of the last-stage secondary voltage doubler circuit 2 is connected to the load resistor R.

[0042] The first-stage voltage doubling circuit 1 comprises a first-stage microstrip line matching circuit 1-1, a capacitor C1, diodes D1 and D2, a first-stage harmonic suppression circuit 1-2 and a first-stage microstrip transmission line filter circuit 1-3.

[0043] Among them, one end of the matching circuit is connected to the input end, and the other end is connected to the capacitor C1. The other end of the capacitor C1 is connected to the positive electrode of the diode D2 through the microstrip W1. The negative electrode of the diode D2 is connected to the first-stage microstrip transmission line filter circuit 1-3. The other end of the first-stage microstrip transmission line filter circuit 1-3 is connected to the secondary voltage doubler circuit 2.

[0044] The first-stage voltage doubling circuit 1 also includes a first-stage harmonic suppression circuit 1-2, one end of the first-stage harmonic suppression circuit 1-2 is grounded, and the other end is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the anode of the diode D2.

[0045] The secondary voltage doubler circuit comprises a capacitor, a microstrip, two diodes, a secondary harmonic suppression circuit and a secondary microstrip transmission line filter circuit, and the connection relationship is the same as that of the primary voltage doubler circuit 1.

[0046] One end of the capacitor of the secondary voltage doubler circuit is connected to the output end of the primary voltage doubler circuit 1, and the output end of the secondary microstrip transmission line filter circuit of the secondary voltage doubler circuit is connected to the output end of the primary microstrip transmission line filter circuit 1-3.

[0047] like Figure 4 As shown, if a second secondary voltage doubler circuit is included, one end of the capacitor of the second secondary voltage doubler circuit is connected to the output end of the first voltage doubler circuit 1, and the output end of the secondary microstrip transmission line filter circuit of the second secondary voltage doubler circuit is connected to the output end of the first microstrip transmission line filter circuit 1-3.

[0048] Figure 4 The structure in the dashed box refers to Figure 2 The structure after capacitor C1.

[0049] The microstrip line matching circuit is used for impedance matching, so that the rectified input power can be fed into the circuit with maximum low reflection.

[0050] Due to the nonlinear effect of the diode, secondary and tertiary harmonics will be generated during the rectification process. The harmonic suppression circuit is used to reflect the harmonics back to the diode for rectification again, thereby improving efficiency.

[0051] The microstrip transmission line filter circuit is used to filter out radio frequency components, and only direct current can pass through to obtain a rectified direct current output.

[0052] Capacitors and diodes are the basic components of the rectifier circuit. The two diodes are alternately turned on and off in different microwave half-wave cycles, cooperating with the charging and discharging of the capacitor to achieve the conversion of microwave to DC.

[0053] For example, Figure 1 As shown, the first-stage voltage doubler circuit 1 is a first-stage voltage doubler circuit, and the plurality of secondary voltage doubler circuits 2 include a second-stage voltage doubler circuit, a third-stage voltage doubler circuit to an N-stage voltage doubler circuit, and each stage of the voltage doubler rectifier circuit is connected by a DC blocking capacitor C DC To isolate the DC component, the input end of the first stage inputs the rectified RF power Pin, and the output end of the Nth stage is connected to the load resistor R, the voltage on which is the rectified output voltage Vout.

[0054] The output voltage V1 of the first voltage doubler circuit is connected to the DC ground GND2 of the second voltage doubler circuit, the output voltage V2 of the second voltage doubler circuit is connected to the DC ground GND3 of the third voltage doubler circuit, and so on, until the output end of the Nth voltage doubler circuit.

[0055] The present invention proposes a cascade voltage doubler rectifier circuit structure suitable for low-input power and high-output voltage power terminals. By isolating the DC components between single-stage voltage doubler circuits and utilizing the circuit topology connection structure, the output voltage is improved, the DC conversion between the rectifier circuit and the power terminal is eliminated, and high rectification efficiency is ensured.

[0056] As a preferred embodiment of this invention:

[0057] like Figure 2 As shown, the matching circuit includes a microstrip line W101 and a microstrip line W102, one end of the microstrip line W101 is connected to the input port of the voltage doubler rectifier circuit, and the other end is connected to one end of the microstrip line W102, the other end of the microstrip line W102 is connected to one end of the microstrip line W1 via a capacitor C1, and the other end of the microstrip line W1 is connected to the positive electrode of the diode D2.

[0058] The microstrip line W101 is a transmission line, and the microstrip line W102 is an open line.

[0059] As a preferred embodiment of this invention:

[0060] like Figure 2 As shown, the first-stage harmonic suppression circuit 1-2 is a microstrip line W02, one end of the microstrip line W02 is connected to the anode of the diode D1, and the other end is grounded, and the cathode of the diode D1 is connected to the anode of the diode D2.

[0061] The length of the microstrip line W02 is one eighth of the wavelength of the operating frequency of the rectifier circuit.

[0062] As a preferred embodiment of this invention:

[0063] like Figure 2 As shown, the first-stage microstrip transmission line filter circuit 1-3 includes a microstrip transmission line W03 and a microstrip transmission line W04 connected in sequence, one end of the microstrip transmission line W03 is connected to the cathode of the diode D1, and the other end is connected to the microstrip transmission line W04, and the other end of the microstrip transmission line W04 is connected to the microstrip transmission line W07.

[0064] The end of the microstrip transmission line W03 connected to the microstrip transmission line W04 is also connected to the microstrip transmission line W05 and the microstrip transmission line W06 respectively.

[0065] The microstrip transmission line W05, microstrip transmission line W06 and microstrip transmission line W07 are open lines.

[0066] The lengths of the microstrip transmission lines W03 and W04 are one quarter of the wavelength of the operating frequency of the rectifier circuit; the open-circuit microstrip transmission lines W05, W06 and W07 are one quarter, one eighth and one twelfth of the wavelength of the operating frequency of the rectifier circuit respectively.

[0067] Embodiment 2:

[0068] In order to verify the present invention, a 5.8GHz two-stage cascaded microstrip voltage doubler rectifier circuit is designed based on the above structure. Figure 3 As shown, the specific structure is as follows:

[0069] It includes a micro-strip 101, a capacitor C2, a micro-strip 301, a diode D22, a micro-strip 303 and a micro-strip 304 connected in sequence, wherein the positive electrode of the diode D22 is connected to the micro-strip 301, the negative electrode of the diode D22 is connected to the micro-strip 303, the micro-strip 303 is also connected to the micro-strip 305 and the micro-strip 306, the micro-strip 304 is also connected to the micro-strip 307, and the micro-strip 305, the micro-strip 306 and the micro-strip 307 are open lines.

[0070] One end of the micro strip 304 connected to the micro strip 307 is also connected to a load resistor R, and the other end of the load resistor R is grounded.

[0071] It also includes a micro-strip 302 and a diode D21 connected in sequence. One end of the micro-strip 302 is grounded, and the other end is connected to the anode of the diode D21. The cathode of the diode D21 is connected to the anode of the diode D22.

[0072] It also includes a connected capacitor C1, a micro-line strip 201, a diode D32, a micro-line strip 203 and a micro-line strip 204, wherein the positive electrode of the diode D32 is connected to the micro-line strip 201, and the negative electrode of the diode D32 is connected to the micro-line strip 203;

[0073] The micro-strip 203 is also connected to the micro-strip 205 and the micro-strip 206 , and the micro-strip 204 is also connected to the micro-strip 207 . The micro-strip 205 , the micro-strip 206 and the micro-strip 207 are open lines.

[0074] The end of the micro-line strip 204 connected to the micro-line strip 207 is also connected to the end of the load resistor R grounded, and the end of the micro-line strip 204 connected to the micro-line strip 207 is also connected to the end of the load resistor R grounded. DC Then ground.

[0075] It also includes a micro-strip 202 and a diode D31 connected in sequence. One end of the micro-strip 202 is grounded, and the other end is connected to the anode of the diode D31. The cathode of the diode D31 is connected to the anode of the diode D32.

[0076] A simulation circuit was built in ADS. The circuit dielectric board thickness was 0.8 mm, the dielectric constant was 2.55, and the loss was 0.0018.

[0077] After optimization, the specific circuit size is as follows:

[0078] The microstrip line 101 has a width of 1.1 mm and a length of 6.1 mm.

[0079] The microstrip line 102 has a width of 1.1 mm and a length of 8 mm.

[0080] The microstrip line 201 has a width of 1.1 mm and a length of 5.4 mm.

[0081] The microstrip line 202 has a width of 1.1 mm and a length of 8.46 mm.

[0082] The microstrip line 203 has a width of 1.1 mm and a length of 6.8 mm.

[0083] The microstrip line 204 has a width of 1.1 mm and a length of 6.8 mm.

[0084] The microstrip line 205 has a width of 1.1 mm and a length of 6.8 mm.

[0085] The microstrip line 206 has a width of 1.1 mm and a length of 3.28 mm.

[0086] The microstrip line 207 has a width of 1.1 mm and a length of 2.64 mm.

[0087] The microstrip line 301 has a width of 1.1 mm and a length of 5.4 mm.

[0088] The microstrip line 302 has a width of 1.1 mm and a length of 8.46 mm.

[0089] The microstrip line 303 has a width of 1.1 mm and a length of 6.8 mm.

[0090] The microstrip line 304 has a width of 1.1 mm and a length of 6.8 mm.

[0091] The microstrip line 305 has a width of 1.1 mm and a length of 6.8 mm.

[0092] The microstrip line 306 has a width of 1.1 mm and a length of 3.23 mm.

[0093] The microstrip line 307 has a width of 1.1 mm and a length of 2.64 mm.

[0094] Capacitor C1 = 10000pF, capacitor C2 = 10000pF, capacitor C DC =0.47uF, resistor R=2700Ω.

[0095] In order to verify the high efficiency and high output voltage characteristics of the rectifier circuit, a single-stage voltage doubler rectifier circuit was simulated for comparison. The simulation results of the two-stage and single-stage rectifier circuits are shown in Figure 5(a) and Figure 5(b), respectively. It can be seen that when the load resistance is in the range of 1400-3400Ω, the rectification efficiency of the two-stage voltage doubler rectifier circuit is above 70%, and the output voltage is higher than 7.5V; while the rectification efficiency of the single-stage voltage doubler circuit is also better than 70%, and the output voltage is only greater than 4.7V, indicating that the rectifier voltage can achieve a higher output voltage while maintaining a high rectification efficiency.

[0096] The measured results of the developed rectifier circuit are shown in Figure 5(c). When the input power is 35mW, the designed two-stage voltage doubler circuit has a maximum conversion efficiency of 70.5% and an output voltage of 7.2V; the output voltage of the single-stage voltage doubler circuit is 3.91V when the efficiency is the highest. Comparing the efficiency and output voltage of the single-stage voltage doubler rectifier circuit and the two-stage voltage doubler rectifier circuit, the rectification efficiency of the two-stage voltage doubler circuit is almost the same as that of the single-stage voltage doubler rectifier circuit under different input powers, but the output voltage is significantly improved. The high efficiency and high output voltage characteristics of the rectifier circuit are verified.

[0097] The present invention proposes a voltage doubling rectifier circuit structure, which utilizes inter-stage DC isolation to realize a cascade voltage doubling rectifier circuit topology. In the proposed topology, the DC component of each stage of the rectifier circuit is isolated by a capacitor, and the output voltage of the upper stage rectifier circuit will increase the ground DC component of the lower stage rectifier circuit. The proposed method isolates the DC component between each stage, while the high-frequency component is not isolated, ensuring that the transmission characteristics of each stage of the rectifier circuit can remain unchanged. While ensuring the rectification efficiency, a high rectifier output voltage is achieved under low input power conditions. It can be effectively applied to power terminals in low power density receiving energy transmission systems, eliminating the DC conversion link and simplifying the circuit structure.

[0098] The above technical solutions are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be conceived by any technician familiar with the field within the technical scope disclosed by the present invention without creative work are all covered within the protection scope of the present invention.

Claims

1. A cascade voltage doubler rectifier circuit, characterized in that: The invention comprises a cascaded multi-stage voltage doubling rectifier circuit, wherein the multi-stage voltage doubling rectifier circuit comprises a cascaded first-stage voltage doubling circuit (1) and at least one secondary-stage voltage doubling circuit (2), and a DC blocking capacitor C is connected between adjacent first-stage voltage doubling circuits (1) and secondary-stage voltage doubling circuits (2) and between adjacent secondary-stage voltage doubling circuits (2). DC ; The input end of the first-stage voltage multiplier circuit (1) receives an input voltage provided by an external device, and the output end of the last-stage secondary voltage multiplier circuit (2) is connected to a load resistor R; The first-stage voltage doubling circuit (1) comprises a first-stage microstrip line matching circuit (1-1), a microstrip W1, a capacitor C1, diodes D1 and D2, a first-stage harmonic suppression circuit (1-2) and a first-stage microstrip transmission line filter circuit (1-3), wherein: One end of the first-stage microstrip line matching circuit (1-1) is connected to the input end, and the other end is connected to the capacitor C1, the other end of the capacitor C1 is connected to the positive electrode of the diode D2 through the microstrip W1, the negative electrode of the diode D2 is connected to the first-stage microstrip transmission line filter circuit (1-3), and the other end of the first-stage microstrip transmission line filter circuit (1-3) is connected to the secondary voltage doubler circuit (2); One end of the first-stage harmonic suppression circuit (1-2) is grounded, and the other end is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the anode of the diode D2; The secondary voltage doubler circuit comprises a capacitor, a microstrip, two diodes, a secondary harmonic suppression circuit and a secondary microstrip transmission line filter circuit, and the connection relationship is the same as that of the primary voltage doubler circuit (1); One end of the capacitor of the secondary voltage doubler circuit is connected to the output end of the primary voltage doubler circuit (1), and the output end of the secondary microstrip transmission line filter circuit of the secondary voltage doubler circuit is connected to the output end of the primary microstrip transmission line filter circuit (1-3).

2. The cascade voltage doubler rectifier circuit according to claim 1, characterized in that: The first-stage microstrip line matching circuit (1-1) comprises a microstrip line W101 and a microstrip line W102, one end of the microstrip line W101 is connected to the input port of the voltage doubler rectifier circuit, and the other end is connected to one end of the microstrip line W102, the other end of the microstrip line W102 is connected to one end of the microstrip line W1 via a capacitor C1, the other end of the microstrip line W1 is connected to the positive electrode of a diode D2, and the negative electrode of the diode D2 is connected to the first-stage microstrip transmission line filter circuit (1-3); The microstrip line W101 is a transmission line, and the microstrip line W102 is an open line.

3. The cascade voltage doubler rectifier circuit according to claim 2, characterized in that: The first-stage harmonic suppression circuit (1-2) is a microstrip line W02, one end of the microstrip line W02 is connected to the positive electrode of the diode D1, and the other end is grounded, and the negative electrode of the diode D1 is connected to the positive electrode of the diode D2; The length of the microstrip line W02 is one eighth of the wavelength of the operating frequency of the rectifier circuit.

4. The cascade voltage doubler rectifier circuit according to claim 3, characterized in that: The first-stage microstrip transmission line filter circuit (1-3) comprises a microstrip transmission line W03 and a microstrip transmission line W04 which are connected in sequence, one end of the microstrip transmission line W03 is connected to the cathode of the diode D2, and the other end is connected to the microstrip transmission line W04, and the other end of the microstrip transmission line W04 is connected to the microstrip transmission line W07 and the DC ground of the secondary voltage doubler circuit; The microstrip transmission line W03 is connected to one end of the microstrip transmission line W04 and is also connected to the microstrip transmission line W05 and the microstrip transmission line W06. The microstrip transmission line W05, microstrip transmission line W06 and microstrip transmission line W07 are open lines; The lengths of the microstrip transmission lines W03 and W04 are one-fourth of the wavelength of the operating frequency of the rectifier circuit; the open-circuit microstrip transmission lines W05, W06 and W07 are one-fourth, one-eighth and one-twelfth of the wavelength of the operating frequency of the rectifier circuit respectively.

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