Broadband circularly polarized rectifying antenna and device

Abstract

The invention relates to the technical field of radio frequency energy collection, solves the problem that the output voltage and the conversion efficiency are limited due to the fact that a rectification antenna in the prior art is single in working frequency band, narrow in bandwidth and incapable of receiving circularly polarized waves, and discloses a wide-frequency-band circularly polarized rectification antenna which comprises an antenna body used for collecting radio frequency energy in the environment, the antenna comprises a substrate, a dielectric resonator and a rectifying circuit, the dielectric resonator and the rectifying circuit are arranged on the substrate, the rectifying circuit is used for converting radio frequency energy collected by the antenna into direct current energy to supply power to a load L2, and the rectifying circuit comprises a matching circuit. The rectifying antenna is simple in structure and high in average efficiency and has a circular polarization characteristic in an application frequency band, and the rectifying circuit is also simple in structure, is based on a single rectifying diode structure and completely covers UMTS-2100, Wi-Fi and LTE-2600 frequency bands.

Description

Technical Field

[0001] This application relates to the field of radio frequency energy harvesting technology, and in particular to a wideband circularly polarized rectified antenna and device. Background Technology

[0002] The rapid development of IoT technology has promoted the application of related wireless sensors, and their power supply has also attracted attention. Radio frequency energy harvesting systems, with their advantages of all-weather operation, long working hours, and low maintenance costs, have become a new power supply method. They input electromagnetic energy distributed in space into the system through a receiving antenna and utilize the AC-DC conversion capability of a rectifier circuit to output DC voltage, which can be used to power low-power devices such as wireless sensor nodes.

[0003] However, existing antennas are limited to a single operating frequency band, which restricts their compatibility across all geographical regions. Within a single operating frequency band, the power received by the acquisition unit is also lower, and the antenna polarization is linear, which cannot receive circularly polarized waves, limiting the polarization types of the received radio frequency signals. Furthermore, the rectifier circuit is also limited to a single operating frequency band with a narrow bandwidth, restricting the application possibilities in different scenarios, and the single frequency band limits the output voltage and conversion efficiency. Summary of the Invention

[0004] The purpose of this application is to overcome the problems of existing rectifier antennas having a single operating frequency band, narrow bandwidth, and inability to receive circularly polarized waves, which limit the output voltage and conversion efficiency, and to provide a wideband circularly polarized rectifier antenna and device.

[0005] This application provides a wideband circularly polarized rectified antenna, comprising:

[0006] An antenna for collecting radio frequency energy in the environment, the antenna including a substrate and a dielectric resonator disposed on the substrate, wherein the upper surface of the substrate is a ground plane, a cross-shaped slit is etched on the ground plane, a microstrip feed line is printed on the lower surface of the substrate, and an excitation port is provided on one side of the substrate, the excitation port being connected to the microstrip feed line and the upper surface of the substrate.

[0007] A rectifier circuit is provided to convert the radio frequency energy collected by the antenna into DC energy to power the load L2. The rectifier circuit includes a matching circuit. The output terminal of the matching circuit is electrically connected to a DC anti-backflow capacitor C1. The end of the DC anti-backflow capacitor C1 away from the matching circuit is electrically connected to a radio frequency anti-backflow inductor L1 and a rectifier diode D. The DC anti-backflow capacitor C1 is electrically connected to the negative terminal of the rectifier diode D, and the positive terminal of the rectifier diode D is grounded. The end of the radio frequency anti-backflow inductor L1 away from the DC anti-backflow capacitor C1 is electrically connected to a smoothing capacitor C2 and the load L2. The other ends of the smoothing capacitor C2 and the load L2 are both grounded.

[0008] Furthermore, the antenna is used to collect radio frequency energy in the UMTS-2100, Wi-Fi and LTE-2600 frequency bands.

[0009] Furthermore, the dielectric resonator includes a regular polygonal portion, an annular portion, and connecting portions, all of which are disposed on the substrate. The regular polygonal portion is disposed inside the annular portion, and the regular polygonal portion and the annular portion are connected by a number of connecting portions equal to the number of sides of the regular polygonal portion.

[0010] Furthermore, the regular polygonal portion and the annular portion are arranged in a centrally symmetrical manner, and one side wall of the connecting portion is coplanar with one side wall of the regular polygonal portion.

[0011] Furthermore, the regular polygons in the regular polygon portion include squares, regular hexagons, and regular octagons.

[0012] Furthermore, the length of the horizontal part of the cross-shaped slit is not equal to the length of the vertical part.

[0013] Furthermore, the microstrip feed line is configured as a stepped balun structure that is wide at the bottom and narrow at the top.

[0014] Furthermore, the rectifier diode D includes a capacitor C3, an inductor L3, and a Schottky diode SBD. The positive terminal of the Schottky diode SBD is grounded, and the negative terminal of the Schottky diode SBD is electrically connected to the inductor L3. The other end of the inductor L3 is electrically connected to a DC anti-backflow capacitor C1. One end of the capacitor C3 is electrically connected to the positive terminal of the Schottky diode SBD, and the other end of the Schottky diode SBD is electrically connected to the end of the inductor L3 furthest from the Schottky diode SBD.

[0015] Furthermore, the matching circuit is configured as a microstrip line with a single parallel diode topology.

[0016] Furthermore, the dielectric resonator is an alumina ceramic dielectric resonator with a relative permittivity of 9.6-10, and the substrate is an FR4 dielectric board with a relative permittivity of 4-4.8.

[0017] This application has the following advantages: The rectifier antenna of this application is used to collect environmental radio frequency energy in the UMTS-2100, Wi-Fi and LTE-2600 bands. The rectifier antenna has a simple structure, high average efficiency and circular polarization characteristics in the application frequency band. The rectifier circuit is also simple in structure, based on a single rectifier diode structure, and fully covers the three operating frequency bands under consideration. It is composed of distributed components, has a simple structure and low production cost. In addition, even at low input power, the efficiency in the operating frequency band remains relatively high. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the antenna structure in the broadband circularly polarized rectified antenna according to an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the dielectric resonator in the broadband circularly polarized rectified antenna according to an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the substrate structure in the broadband circularly polarized rectified antenna according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the structure of the regular hexagonal dielectric resonator in the broadband circularly polarized rectified antenna of this application embodiment;

[0024] Figure 5 This is a schematic diagram of the structure of antenna Ant1, which is composed of a dielectric resonator with a square portion, in a broadband circularly polarized rectified antenna according to an embodiment of this application.

[0025] Figure 6 This is a schematic diagram of the structure of Ant2, a wideband circularly polarized rectified antenna according to an embodiment of this application, which is composed of a dielectric resonator consisting of a square part and a connecting part.

[0026] Figure 7 This is a schematic diagram of the structure of Ant3, a broadband circularly polarized rectified antenna according to an embodiment of this application, which is composed of a dielectric resonator consisting of a square part, a ring part, and a connecting part.

[0027] Figure 8 This is a diagram showing the relationship between S11 and frequency for antennas Ant1, Ant2, and Ant3 in the broadband circularly polarized rectified antenna of this application embodiment;

[0028] Figure 9 This is a graph showing the relationship between the Axial Ratio and frequency of antennas Ant1, Ant2, and Ant3 in the broadband circularly polarized rectified antenna of this application embodiment;

[0029] Figure 10 This is a circuit diagram of the rectifier circuit in the broadband circularly polarized rectifier antenna according to an embodiment of this application;

[0030] Figure 11 This is a schematic diagram of the microstrip line structure in the broadband circularly polarized rectified antenna according to an embodiment of this application;

[0031] Figure 12 This is an equivalent circuit diagram of the matching circuit in the broadband circularly polarized rectified antenna according to an embodiment of this application;

[0032] Figure 13 This is a circuit diagram of the packaged rectifier diode D in the broadband circularly polarized rectifier antenna of this application embodiment;

[0033] Figure 14 This is a graph showing the relationship between S11 and frequency for a wideband circularly polarized rectified antenna according to an embodiment of this application under different input powers;

[0034] Figure 15 These are simulation and measured figures of the RF-DC conversion efficiency and frequency of the wideband circularly polarized rectified antenna according to an embodiment of this application under different input powers;

[0035] Figure 16 These are simulation and measured figures of the RF-DC conversion efficiency and input power of the wideband circularly polarized rectifier antenna according to an embodiment of this application at different input frequencies.

[0036] Figure label:

[0037] 100. Antenna; 101. Substrate; 1011. Cross-shaped slot; 1012. Microstrip feed line; 102. Dielectric resonator; 1021. Regular polygonal part; 1022. Ring part; 1023. Connecting part; 103. Excitation port; 200. Rectifier circuit; 201. Matching circuit. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] Example

[0040] An embodiment of this application relates to a wideband circularly polarized rectified antenna, comprising: an antenna 100, the antenna 100 being used to collect radio frequency energy from the environment, the antenna 100 including a substrate 101 and a dielectric resonator 102 disposed on the substrate 101, wherein the upper surface of the substrate 101 is a ground plane, a cross-shaped slot 1011 is etched on the ground plane, a microstrip feed line 1012 is printed on the lower surface of the substrate 101, and an excitation port 1023 is provided on one side of the substrate 101, the excitation port 1023 being connected to the microstrip feed line 1012 and the upper surface of the substrate 101;

[0041] Specifically, such as Figure 1 As shown, the antenna 100 is used to collect radio frequency energy in the UMTS-2100, Wi-Fi, and LTE-2600 frequency bands. A dielectric resonator 102 is placed at the center above the substrate 101. The dielectric resonator 102 includes a regular polygonal portion 1021, a ring portion 1022, and a connecting portion 1023. The regular polygonal portion 1021, the ring portion 1022, and the connecting portion 1023 are all disposed on the substrate 101. The regular polygonal portion 1021 is disposed on the ring portion 1022. Inside part 1022, the regular polygonal part 1021 and the annular part 1022 are connected by a number of connecting parts 1023 equal to the number of sides of the regular polygonal part 1021. The regular polygonal part 1021 and the annular part 1022 are centrally symmetrically arranged. One side wall of each connecting part 1023 is coplanar with one side wall of the regular polygonal part 1021. The regular polygons in the regular polygonal part 1021 include squares, regular hexagons, and regular octagons. The regular polygonal part 1021 is preferably a square, such as... Figure 1-2 As shown, secondly, the regular polygonal part 1021 can also be a regular hexagon, such as... Figure 4As shown, other regular polygons are also possible. The dielectric resonator 102 is an alumina ceramic dielectric resonator with a relative permittivity of 9.6-10, and the substrate 101 is an FR4 dielectric substrate with a relative permittivity of 4-4.8. The dielectric resonator 102 has a relative permittivity of 9.8, and the substrate 101 has a relative permittivity of 4.4, resulting in optimal performance. The upper surface of the substrate 101 is the ground plane, and unequal-length cross-shaped slots 1011 are etched on the ground plane; that is, the slot lengths of the horizontal and vertical sections of the cross-shaped slots 1011 are not equal. The microstrip feed line 1012 is printed on the lower surface of the substrate 101 at the center line position. To adjust impedance matching and obtain a wider impedance bandwidth, the microstrip feed line 1012 is configured as a stepped balun structure, wider at the bottom and narrower at the top. The excitation port 1023 is located on the side of the substrate 101, connecting the microstrip feed line 1012 on the lower surface of the substrate 101 and the ground plane on the upper surface of the substrate 101, and feeding the resonator through the feed line and the gap coupling.

[0042] like Figure 1-3 As shown, the antenna 100 is composed of a dielectric resonator 102 and a substrate 101. A hollowed-out cylindrical dielectric resonator 102 is placed at the center of the substrate 101, and its top view is shown below. Figure 1 As shown. The dielectric resonator 102 has a height of hd and exhibits central symmetry. It is composed of a square portion (ld×ld) and a circular portion 1022 (R, w1) connected by four connecting portions 1023 with a width of w2. The dielectric resonator 102 is made of alumina ceramic with a dielectric constant of 9.8. The substrate 101 has dimensions of L×W×hs, and its top view is shown below. Figure 3 As shown in Table 1, the substrate 101 is an FR4 dielectric substrate with a thickness of hs, a relative permittivity of 4.4, and a loss tangent of 0.02. The upper surface of the substrate 101 is the ground plane, and unequal-length cross-shaped slots 1011 (ls1×ws, ls2×ws) are etched on the ground plane. The microstrip feed line 1012 is printed on the centerline of the lower surface of the substrate 101. To adjust impedance matching and obtain a wider impedance bandwidth, the microstrip feed line 1012 is configured as a stepped balun structure with a wide bottom (lf2×wf1) and a narrow top (lf1×wf2). The excitation port 1023 is located on the side of the substrate 101, connecting the microstrip feed line 1012 on the lower surface of the substrate 101 and the ground plane on the upper surface of the substrate 101. It feeds the resonator through coupling between the feed line and the slots. The structural parameter values ​​of the antenna 100 are shown in Table 1.

[0043] Table 1: Structural parameter values ​​of the proposed antenna 100

[0044] parameter Numerical value (mm) parameter Numerical value (mm) ld 30 R 38 HD 19 ws 2 hs 0.8 ls1 18 W 76 ls2 33 L 76 wf1 1.6 w1 4 wf2 0.8 w2 5 lf1 23 lf2 24

[0045] It should be noted that circularly polarized antennas require an axial ratio of less than 3dB. Although Figure 5Ant1, composed solely of a square dielectric resonator 102, generates two axial ratio resonant points, fAR1 and fAR2, but their values ​​are 3.99 dB and 6.38 dB respectively (e.g., ...). Figure 9 As shown), none of them meet the 3dB axial ratio requirement. To reduce the antenna axial ratio, in Figure 5 Based on the antenna, four elongated dielectric resonators 102 were introduced, resulting in the following: Figure 6 Ant2 is shown. (As shown) Figure 6 The simulation results for the Ant2 antenna are shown below. Figure 8-9 As shown by the green dashed line, its -10dB impedance passband is 1.96-2.97GHz, encompassing... Figure 5 The impedance passband of the antenna Ant1 was significantly broadened. After introducing the long strip resonator, the circular polarization characteristics across the entire bandwidth were significantly improved, and an axial ratio resonant point fAR1, which was originally greater than 3dB, dropped to below 3dB, thus achieving an axial ratio passband of 2.07-2.21GHz (6.5%). It is worth noting that... Figure 6 The antenna Ant2 shown produces a new resonant point fAR3 at 3.38 GHz. Considering... Figure 6 The Ant2 antenna shown still has a relatively narrow axial bandwidth, therefore, in Figure 6 Based on the antenna Ant2 shown, a circular ring dielectric resonator 102 is introduced on the outermost side, resulting in the final antenna. Figure 7 The antenna Ant3 shown has the following structure: Figure 7 As shown, the dielectric resonator 102 includes a square portion, a ring portion 1022, and a connecting portion 1023. It can be seen that its -10dB impedance passband is similar to... Figure 5 The comparison shown is slightly improved, with significant improvements in both the axial ratio resonant points fAR2 and fAR3. Furthermore, the axial ratio resonant point fAR3 shifts to lower frequencies, ultimately achieving a -10dB impedance bandwidth of 48.2% (1.92-3.14GHz), a 3dB axial ratio bandwidth of 40.2% (2.07-3.11GHz), and an effective axial ratio bandwidth of 40.2% (2.07-3.11GHz).

[0046] like Figure 10As shown, it also includes a rectifier circuit 200, which is used to convert the radio frequency energy collected by the antenna 100 into DC energy to power the load L2. The rectifier circuit 200 includes a matching circuit 201. The output terminal of the matching circuit 201 is electrically connected to a DC anti-backflow capacitor C1. The end of the DC anti-backflow capacitor C1 away from the matching circuit 201 is electrically connected to a radio frequency anti-backflow inductor L1 and a rectifier diode D. The DC anti-backflow capacitor C1 is electrically connected to the negative terminal of the rectifier diode D, and the positive terminal of the rectifier diode D is grounded. The end of the radio frequency anti-backflow inductor L1 away from the DC anti-backflow capacitor C1 is electrically connected to a smoothing capacitor C2 and the load L2. The other ends of the smoothing capacitor C2 and the load L2 are both grounded.

[0047] Specifically, in this embodiment, a multi-stage matched dual-stub rectifier circuit 200 is selected. Its matching effect and flexibility are better than that of a single-stub microstrip line. Furthermore, compared to other gradient structures, it is smaller in size. Because the junction capacitance of the low-frequency rectifier diode D is relatively large, when a high-frequency AC current is input, the capacitance is equivalent to a short circuit, and the diode does not have unidirectional conductivity. Therefore, based on the target operating frequency band of this application, which is mainly UMTS-2100 / WI-FI / LTE-2600 RF signals, after comprehensively considering the diode's forward rectified current, reverse withstand voltage, maximum operating frequency, and reverse recovery time, the final rectifier diode D selected is a Schottky diode SMS-7630. Figure 13 As shown, the rectifier diode D includes a capacitor C3, an inductor L3, and a Schottky diode SBD. The positive terminal of the Schottky diode SBD is grounded, and the negative terminal of the Schottky diode SBD is electrically connected to the inductor L3. The other end of the inductor L3 is electrically connected to a DC anti-backflow capacitor C1. One end of the capacitor C3 is electrically connected to the positive terminal of the Schottky diode SBD, and the other end of the Schottky diode SBD is electrically connected to the end of the inductor L3 furthest from the Schottky diode SBD.

[0048] Furthermore, since the full-wave bridge and voltage doubler rectifier circuit 200 includes more diodes, this results in greater losses, which reduces the overall rectifier performance. A single-diode rectifier is more efficient under low input power conditions. Therefore, in this application, the matching circuit 201 is configured as a single-parallel diode topology microstrip line such as... Figure 11 As shown, Figure 12 This is the equivalent circuit of the matching circuit 201 in this embodiment. Additionally, as... Figure 12As shown, in the matching circuit, a single parallel diode topology microstrip line can also be replaced by soldering capacitors and inductors. A single parallel topology refers to using a single parallel diode for rectification; the diode is packaged with a capacitor and inductor. Furthermore, to eliminate some harmonics and ensure the conversion efficiency of the rectifier circuit 200 across three frequency bands, a filter composed of capacitors and microstrip lines was also designed, such as... Figure 11 The image shown (the gray area in the figure represents the microstrip line) is an LC filter composed of a microstrip line, an RF anti-backflow inductor L1, and a smoothing capacitor C2.

[0049] Figure 14 The graphs showing S11 versus frequency under different input power are displayed. It can be observed that the rectifier circuit 200 proposed in this embodiment is suitable for operation over a wide range of input power from -5 to 5 dBm. The operating range is stable within this input power range, and the rectifier operates at a frequency range of 2-3.1 GHz, consistent with the circularly polarized wideband receiving antenna 100 proposed in this application.

[0050] The simulation and measured RF-DC conversion efficiency of the proposed rectifier circuit under 200 different input powers are as follows: Figure 15 As shown, the simulation and measured results agree well. The reason why the measured results are lower than the simulation results is mainly due to impedance matching deviations caused by welding and processing. When the input RF power levels are -5dBm, 0dBm, and 5dBm, the measured maximum RF-DC conversion efficiencies are 26.6%, 41.6%, and 51.9%, respectively. As can be seen from the figure, the RF-DC conversion efficiency of the rectifier circuit 200 is stable throughout the entire operating range under different input power levels. Notably, at a low input power of -5dBm, the lowest conversion efficiency is 13.6% and the highest is 26.9% within the operating frequency band. This conversion efficiency remains at a good level, which is highly advantageous for RF energy harvesting in the environment.

[0051] Figure 16The graphs show the simulated and measured RF-DC conversion efficiency versus input power, with the input power varying between -30 and 30 dBm. As can be seen from the graphs, both simulations and measurements achieved the maximum RF-DC conversion efficiency at 2.1 GHz, where the input power was 14 dBm and the measured conversion efficiency was 54.2%. It is worth noting that in the measured results, when the input power was between 5 and 20 dBm, the efficiency across the three frequency bands remained almost constant, consistently above 30%, 40%, and 50%, respectively. The input power corresponding to the highest conversion efficiency showed a shift, primarily due to overall changes in the S11 parameter caused by soldering and circuit board processing. However, the simulation and measurement results generally agree well. Furthermore, it should be noted that the RF-DC conversion efficiency remained considerable at low input power for all three frequency bands; when the input power was only -10 dBm, the efficiency in all three bands exceeded 12%.

[0052] This embodiment presents a simple, novel wideband circularly polarized rectified antenna for harvesting environmental radio frequency energy in the UMTS-2100, Wi-Fi, and LTE-2600 bands. The rectified antenna has a simple structure, high average efficiency, and circular polarization characteristics within the application frequency band. The rectifier circuit 200 also has a simple structure, based on a single rectifier diode D structure, and fully covers the three considered operating frequency bands. It consists of distributed components, has a simple structure, and low production cost. Furthermore, even at low input power, the efficiency within the operating frequency band remains relatively high.

[0053] The above are merely preferred embodiments of this application; however, the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and its improved concept, should be covered within the scope of protection of this application.

Claims

1. A wideband circularly polarized rectified antenna, characterized in that, include: An antenna for collecting radio frequency energy in the environment, the antenna including a substrate and a dielectric resonator disposed on the substrate, wherein the upper surface of the substrate is a ground plane, a cross-shaped slit is etched on the ground plane, a microstrip feed line is printed on the lower surface of the substrate, and an excitation port is provided on one side of the substrate, the excitation port being connected to the microstrip feed line and the upper surface of the substrate. A rectifier circuit is provided to convert the radio frequency energy collected by the antenna into DC energy to power the load L2. The rectifier circuit includes a matching circuit. The output terminal of the matching circuit is electrically connected to a DC anti-backflow capacitor C1. The end of the DC anti-backflow capacitor C1 away from the matching circuit is electrically connected to a radio frequency anti-backflow inductor L1 and a rectifier diode D. The DC anti-backflow capacitor C1 is electrically connected to the negative terminal of the rectifier diode D, and the positive terminal of the rectifier diode D is grounded. The end of the radio frequency anti-backflow inductor L1 away from the DC anti-backflow capacitor C1 is electrically connected to a smoothing capacitor C2 and the load L2. The other ends of the smoothing capacitor C2 and the load L2 are both grounded.

2. The wideband circularly polarized rectified antenna according to claim 1, characterized in that, The antenna is used to collect radio frequency energy in the UMTS-2100, Wi-Fi and LTE-2600 frequency bands.

3. The wideband circularly polarized rectified antenna according to claim 1, characterized in that, The dielectric resonator includes a regular polygonal portion, an annular portion, and connecting portions. The regular polygonal portion, annular portion, and connecting portions are all disposed on the substrate. The regular polygonal portion is disposed inside the annular portion. The regular polygonal portion and the annular portion are connected by a number of connecting portions equal to the number of sides of the regular polygonal portion.

4. The wideband circularly polarized rectified antenna according to claim 3, characterized in that, The regular polygonal portion and the annular portion are arranged in a centrally symmetrical manner, and one side wall of the connecting portion is coplanar with one side wall of the regular polygonal portion.

5. The wideband circularly polarized rectified antenna according to claim 3 or 4, characterized in that, The regular polygons in the regular polygon section include squares, regular hexagons, and regular octagons.

6. The wideband circularly polarized rectified antenna according to claim 1, characterized in that, The lengths of the horizontal and vertical sections of the cross-shaped slit are not equal.

7. The wideband circularly polarized rectified antenna according to claim 1, characterized in that, The microstrip feeder is configured as a stepped balun structure that is wide at the bottom and narrow at the top.

8. The wideband circularly polarized rectified antenna according to claim 1, characterized in that, The rectifier diode D includes a capacitor C3, an inductor L3, and a Schottky diode SBD. The positive terminal of the Schottky diode SBD is grounded, and the negative terminal of the Schottky diode SBD is electrically connected to the inductor L3. The other end of the inductor L3 is electrically connected to a DC anti-backflow capacitor C1. One end of the capacitor C3 is electrically connected to the positive terminal of the Schottky diode SBD, and the other end of the Schottky diode SBD is electrically connected to the end of the inductor L3 furthest from the Schottky diode SBD.

9. The wideband circularly polarized rectified antenna according to claim 1, characterized in that, The matching circuit is configured as a single parallel diode topology microstrip line.

10. The wideband circularly polarized rectified antenna according to claim 1, characterized in that, The dielectric resonator is an alumina ceramic dielectric resonator with a relative permittivity of 9.6-10, and the substrate is an FR4 dielectric board with a relative permittivity of 4-4.8.

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