A polarization-insensitive microwave power transmission system

Abstract

The present invention discloses a polarization-insensitive microwave power transmission system. The system includes a base station and a terminal. The base station includes a signal source and a dual-polarization transmitting antenna. Two signal sources respectively output signal source output voltage signals with a phase difference of 90°, and excite the vertical polarization port and the horizontal polarization port of the dual-polarization transmitting antenna. The terminal includes a dual-polarization receiving antenna and a rectifier. The vertical polarization port and the horizontal polarization port of the dual-polarization receiving antenna are respectively connected to rectifiers with the same structure, thereby realizing a polarization-insensitive microwave power transmission system and solving the technical problems of antenna polarization mismatch and uneven polarization power distribution.

Description

Technical Field

[0001] The present invention relates to a microwave power transmission system, and particularly to a polarization-insensitive microwave power transmission system. Background Art

[0002] In the prior art, there are problems of antenna polarization mismatch and uneven polarization power distribution in microwave power transmission. Therefore, there is an urgent need in the art for a circuit structure to meet the polarization-insensitive microwave power transmission system and solve the technical problems of antenna polarization mismatch and uneven polarization power distribution. Summary of the Invention

[0003] Based on the above problems, the present invention proposes a polarization-insensitive microwave power transmission system.

[0004] The present invention provides the following technical solutions:

[0005] On the one hand, the present invention proposes a polarization-insensitive microwave power transmission system, which includes a base station and a terminal;

[0006] The base station includes a signal source and a dual-polarized transmitting antenna; the signal source is two signal sources, and the two signal sources respectively output v s s and iv s s signals (note: i represents a 90° phase difference) to excite the vertical polarization port and the horizontal polarization port of the dual-polarized transmitting antenna.

[0007] The terminal includes a dual-polarized receiving antenna and a rectifier; the vertical polarization port and the horizontal polarization port of the dual-polarized receiving antenna are respectively connected to rectifiers with the same structure.

[0008] Further, the two signal sources respectively output v s s and iv s s signals with a 90° phase difference.

[0009] Further, at any polarization deflection angle, the power received by the rectifier will not have polarization mismatch and uneven polarization power distribution.

[0010] Further, when single-polarization to single-polarization microwave power transmission is performed, the input signal v RX RX of the rectifier is calculated, specifically:

[0011]

[0012] where κ(d) is the free space transmission normalization coefficient, is the polarization deflection angle, and v s s is the output voltage signal of the signal source VCO.

[0013] Further, the input signal v RX RX of the rectifier varies with the polarization deflection angle When the change occurs, when it is equal to 90°, the signal captured by the terminal single-polarization receiving antenna is zero, and the input signal of the rectifier is zero.

[0014] Furthermore, when single-polarization to dual-polarization microwave power transfer occurs,

[0015] the input signals v of the two rectifiers are calculated. RX_VP and v RX_HP Specifically:

[0016]

[0017]

[0018] where κ(d) is the free-space transmission normalization coefficient, is the polarization deflection angle, and v s is the output voltage signal of the signal source VCO.

[0019] Furthermore, the input signals v of the two rectifiers RX_VP and v RX_HP vary with the polarization deflection angle.

[0020] Furthermore, when dual-polarization to dual-polarization microwave power transfer occurs and there is a 00° phase difference excitation,

[0021] the input signals v of the two rectifiers are calculated. RX_VP and v RX_HP Specifically,

[0022]

[0023]

[0024] where κ(d) is the free-space transmission normalization coefficient, is the polarization deflection angle, and v s is the output voltage signal of the signal source VCO.

[0025] Furthermore, when dual-polarization to dual-polarization microwave power transfer occurs and there is a 90° phase difference excitation,

[0026] the input signals v of the two rectifiers are calculated. RX_VP and v RX_HP Specifically,

[0027]

[0028]

[0029] where κ(d) is the free-space transmission normalization coefficient, is the polarization deflection angle, and vs Output a voltage signal for the signal source VCO.

[0030] Furthermore, the polarization-insensitive microwave power transfer system performs the following steps:

[0031] Step 1): The two signal sources respectively output v s and iv s signals (note: i represents a 90° phase difference), exciting the vertical polarization port and the horizontal polarization port of the dual-polarization transmitting antenna;

[0032] Step 2): When the polarization deflection angle changes, that is, in any case of polarization deflection angle , the vertical polarization port (RX VP ) and the horizontal polarization port (RX HP ) of the dual-polarization receiving antenna in the terminal receive signals with the same amplitude, and excite rectifiers with the same structure to achieve polarization-insensitive microwave power transfer.

[0033] The present invention discloses a polarization-insensitive microwave power transfer system, which includes a base station and a terminal. The base station includes a signal source and a dual-polarization transmitting antenna; the two signal sources respectively output signal source output voltage signals with a 90° phase difference, exciting the vertical polarization port and the horizontal polarization port of the dual-polarization transmitting antenna; the terminal includes a dual-polarization receiving antenna and a rectifier, and the vertical polarization port and the horizontal polarization port of the dual-polarization receiving antenna are respectively connected to rectifiers with the same structure, thereby realizing a polarization-insensitive microwave power transfer system, and solving the technical problems of antenna polarization mismatch and uneven polarization power distribution. Description of the Drawings

[0034] Att Figure 1 is the structure diagram of a single-polarization - single-polarization microwave power transfer system;

[0035] Figure 2 is the polarization deflection schematic diagram of a single-polarization - single-polarization microwave power transfer system;

[0036] Att Figure 3 is the structure diagram of a single-polarization - dual-polarization microwave power transfer system;

[0037] Figure 4 is the polarization deflection schematic diagram of a single-polarization - dual-polarization microwave power transfer system;

[0038] Att Figure 5 is the structure diagram of a dual-polarization - dual-polarization (00° phase difference excitation) microwave power transfer system;

[0039] Figure 6 is the polarization deflection schematic diagram of a dual-polarization - dual-polarization (00° phase difference excitation) microwave power transfer system;

[0040] Figure 7It is a structural diagram of a dual-polarization - dual-polarization (90° phase-difference excitation) microwave power transmission system;

[0041] Figure 8 It is a schematic diagram of polarization deflection of a dual-polarization - dual-polarization (90° phase-difference excitation) microwave power transmission system. Specific implementation manner

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0043] Embodiment

[0044] Figure 1 It is a structural diagram of a single-polarization - single-polarization microwave power transmission system ( Figure 2 is its schematic diagram of polarization deflection), the signal source (VCO) in the base station outputs v s signal to excite the single-polarization transmitting antenna (TX). The distance between the base station and the terminal is d, and the polarization deflection angle ranges from 0° to 90° (theoretical analysis is applicable to other polarization deflection angles from 90° to 360°), and the single-polarization receiving antenna (RX) in the terminal captures v s signal. The normalization coefficient for free-space transmission (distance d) is κ(d), and then the input signal v RX to the rectifier (RT) is calculated, as shown in formula (1).

[0045]

[0046] Therefore, the input signal v RX to the rectifier (RT) varies with the polarization deflection angle , that is, the polarization mismatch problem is serious. When is equal to 90°, the signal captured by the single-polarization receiving antenna (RX) in the terminal is zero, and the input signal to the rectifier (RT) is zero.

[0047] Figure 3 It is a structural diagram of a single-polarization - dual-polarization microwave power transmission system ( Figure 4 is its schematic diagram of polarization deflection), the signal source (VCO) in the base station outputs v s signal to excite the single-polarization transmitting antenna (TX). The distance between the base station and the terminal is d, and the polarization deflection angle ranges from 0° to 90° (theoretical analysis is applicable to other polarization deflection angles from 90° to 360°). The vertical polarization port (RX VP ) and the horizontal polarization port (RX HP ) of the dual-polarization receiving antenna in the terminal capture v s signal. The normalization coefficient for free-space transmission (distance d) is κ(d), and then the input signals v RX_VP and v RX_HP to the two rectifiers (RT) are calculated, as shown in formulas (2, 3).

[0048]

[0049]

[0050] Therefore, the input signals v of the two-way rectifier (RT) RX_VP and v RX_HP vary with the polarization deflection angle , that is, the polarization power distribution is uneven, and it is difficult to ensure the maximum efficiency of the two-way rectifier (RT).

[0051] Figure 5 is the structure diagram of the dual-polarization - dual-polarization (00° differential excitation) microwave power transmission system ( Figure 6 is the schematic diagram of its polarization deflection). The two signal sources (VCO) in the base station output v s signals to excite the vertical polarization port (TX VP ) and the horizontal polarization port (TX HP ) of the dual-polarization transmitting antenna. The distance between the base station and the terminal is d, and the polarization deflection angle ranges from 0° to 90° (theoretical analysis is applicable to other polarization deflection angles from 90° to 360°). The vertical polarization port (RX VP ) and the horizontal polarization port (RX HP ) of the dual-polarization receiving antenna in the terminal capture v s signals. The normalization coefficient for free space transmission (distance d) is κ(d), and then the input signals v RX_VP and v RX_HP of the two-way rectifier (RT) are calculated, as shown in formulas (4, 5).

[0052]

[0053]

[0054] Therefore, the input signals v RX_VP and v RX_HP vary with the polarization deflection angle , that is, the polarization power distribution is uneven, and it is difficult to ensure the maximum efficiency of the two-way rectifier (RT).

[0055] Figure 7 is the structure diagram of the dual-polarization - dual-polarization (90° differential excitation) microwave power transmission system ( Figure 8 is the schematic diagram of its polarization deflection). The two signal sources (VCO) in the base station output v s and iv s signals (note: i represents a 90° difference), and excite the vertical polarization port (TX VP ) and the horizontal polarization port (TXHP )。The distance d between the base station and the terminal, and the polarization deflection angle ranges from 0° to 90° (theoretical analysis is applicable to other polarization deflection angles from 90° to 360°). The vertical polarization port (RX VP ) and the horizontal polarization port (RX HP ) of the dual-polarization receiving antenna in the terminal capture v s and iv s signals. The normalization coefficient for free-space transmission (spacing d) is κ(d). Furthermore, the input signals v RX_VP and v RX_HP of the two rectifiers (RT) are calculated, as shown in formulas (4, 5).

[0056]

[0057]

[0058] Therefore, the input signals v RX_VP and v RX_HP of the two rectifiers (RT) remain unchanged with the polarization deflection angle , ensuring the maximization of the efficiency of the two rectifiers (RT), that is, realizing a polarization-insensitive microwave power transfer system.

[0059] The present invention discloses a polarization-insensitive microwave power transfer system, which includes a base station and a terminal. The base station includes a signal source and a dual-polarization transmitting antenna. The two signal sources respectively output signal source output voltage signals with a phase difference of 90°, exciting the vertical polarization port and the horizontal polarization port of the dual-polarization transmitting antenna. The terminal includes a dual-polarization receiving antenna and a rectifier. The vertical polarization port and the horizontal polarization port of the dual-polarization receiving antenna are respectively connected to rectifiers with the same structure, thus realizing a polarization-insensitive microwave power transfer system, and solving the technical problems of antenna polarization mismatch and uneven polarization power distribution.

[0060] The above embodiments of the present invention are combinations of the elements and features of the present invention. Unless otherwise mentioned, the elements or features can be regarded as selective. Each element or feature can be practiced without being combined with other elements or features. In addition, the embodiments of the present invention can be constructed by combining some elements and / or features. The operation sequence described in the embodiments of the present invention can be rearranged. Some configurations of any embodiment can be included in another embodiment and can be replaced by the corresponding configuration of another embodiment. It is obvious to those skilled in the art that the claims that do not have an explicit citation relationship with each other in the appended claims can be combined into embodiments of the present invention, or can be included as new claims in the amendments after the submission of the present invention.

[0061] In a firmware or software configuration manner, embodiments of the present invention may be implemented in the form of modules, procedures, functions, etc. Software code may be stored in a memory unit and executed by a processor. The memory unit is located inside or outside the processor and can send data to and receive data from the processor via various known means.

[0062] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A polarization-insensitive microwave power transmission system, characterized in that, The system includes a base station and a terminal; The base station includes a signal source and a dual-polarized transmitting antenna; The signal source is two signal sources, and the two signal sources respectively output v s and iv s signals, i indicating a 90° phase difference, to excite the vertical polarization port and the horizontal polarization port of the dual-polarized transmitting antenna; The terminal includes a dual-polarized receiving antenna and a rectifier; the vertical polarization port and the horizontal polarization port of the dual-polarized receiving antenna are respectively connected to rectifiers with the same structure; At any polarization deflection angle, the received power of the rectifier will not have polarization mismatch and uneven polarization power distribution; When transmitting microwave energy from single polarization to single polarization, the input signal of the rectifier is calculated as follows: v RX , specifically: （1） Among them, κ ( d ) is the free space transmission normalization coefficient, is the polarization deflection angle, v s is the output voltage signal of the signal source; When converting from single-polarization to dual-polarization microwave power transmission, the input signals of the two rectifiers are calculated and obtained v RX_VP and v RX_HP , specifically: （2） （3） Among them, κ ( d ) is the free space transmission normalization coefficient, is the polarization deflection angle, v s is the output voltage signal of the signal source; When transmitting microwave energy from dual polarization to dual polarization and under the condition of 90° phase difference excitation, the input signals of the two rectifiers are calculated and obtained v RX_VP and v RX_HP , specifically （6） （7） Among them, κ ( d ) is the free space transmission normalization coefficient, is the polarization deflection angle, v s is the output voltage signal of the signal source, i represents a 90° phase difference.

2. The polarization-insensitive microwave power transmission system according to claim 1, wherein Rectifier input signal v RX With the polarization deflection angle Changing, when Equals 90º, the signal captured by the terminal single-polarization receiving antenna is zero, and the rectifier input signal is zero.

3. The polarization-insensitive microwave power transmission system according to claim 1, characterized in that Two-way rectifier input signal v RX_VP and v RX_HP vary with the polarization deflection angle.

4. The polarization-insensitive microwave power transmission system according to claim 1, wherein When dual-polarized to dual-polarized microwave power transfer is performed and under the condition of 0° phase difference excitation, Calculate and obtain the input signals of two rectifiers v RX_VP and v RX_HP , specifically （4） （5） Among them, κ ( d ) is the free space transmission normalization coefficient, is the polarization deflection angle, v s is the output voltage signal of the signal source.

5. A polarization-insensitive microwave power transfer method applicable to the polarization-insensitive microwave power transfer system according to any one of claims 1-4, characterized in that Step 1): The two signal sources respectively output signal source output voltage signals v s and iv s signals, where i represents a 90° phase difference, exciting the vertical polarization port and the horizontal polarization port of the dual-polarized transmitting antenna; Step 2): At any polarization deflection angle the vertical polarization port RX of the dual-polarization receiving antenna in the terminal VP and the horizontal polarization port RX HP receive signals with the same amplitude and excite rectifiers with the same structure to achieve polarization-insensitive microwave energy transmission.

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