Short-wave multiplexer

Abstract

The utility model discloses a short-wave high-power multipath synthesizer, which comprises a shell, a coupling unit, a first-stage synthesis structure, a second-stage synthesis structure and a first-stage impedance conversion structure, the first-stage synthesis structure comprises two first-stage synthesis units, and the second-stage synthesis structure comprises a second-stage synthesis unit. The first-stage synthesis unit comprises a first ferrite magnetic ring with a Material 75 specification and an isolation load; the two-pole synthesis unit comprises two stacked ferrite magnetic rings with a Material 75 specification and an isolation load. According to the utility model, the ferrite magnetic rings with specific specifications are selected to realize the working frequency of 0.8-10 MHz of the power combiner; through inspection, the rated power of the power combiner reaches the average power of 4 * 750W, the isolation degree between the input ports of the power combiner is not less than 25dB, and the two indexes are in a leading level in similar products at home and abroad.

Description

Technical Field

[0001] The utility model relates to a shortwave multi-channel synthesizer. Background Art

[0002] The synthesizer is an important component of the radio frequency system and has important applications in basic scientific research, nuclear physics, military, agriculture, medical and other fields. The synthesizer combines the output power of multiple power sources together, and the power can reach kilowatts or even megawatts. In order to achieve the required power level, some power synthesis systems need to synthesize the output power of several to thousands of power source units for application, which requires the development of a power synthesis system with multiple inputs.

[0003] Power combiners have various structures and types. According to the power level, power combiners can be divided into chip-level power combiners, circuit-level power combiners, space power combiners, and other power combiners. Among them, circuit-level power combiners are power combiners with moderate power levels, which are suitable for combining and applying the output power of multiple power amplifier modules. According to whether they contain a resonant cavity, circuit-level power combiners can be divided into resonant cavity power combiners and non-resonant cavity power combiners.

[0004] Due to production needs, the frequency range of the power synthesizer is 0.8~10MHz, and the frequency ratio of the working frequency band reaches 12.5, which is a typical broadband power synthesizer. The low end of the power synthesizer working frequency reaches 0.8MHz, which is lower than the general shortwave communication frequency band, so the design is difficult, and the synthesizer of this frequency band is still blank in China. Utility Model Content

[0005] The purpose of the utility model is to solve the above deficiencies in the prior art and provide a shortwave multi-channel synthesizer.

[0006] A shortwave multi-channel synthesizer comprises a housing, a coupling unit, a first-stage synthesis structure, a second-stage synthesis structure and a first-stage impedance transformation structure, wherein the first-stage synthesis structure comprises two first-stage synthesis units, the second-stage synthesis structure comprises a two-pole synthesis unit, and the first-stage impedance transformation structure comprises at least one impedance transformation unit;

[0007] The primary synthesis unit includes a first ferrite magnetic ring and an isolation load; the secondary synthesis unit includes two stacked ferrite magnetic rings and an isolation load, the size of the first ferrite magnetic ring is as follows: 35×22×6mm, a twisted pair is wound around the first ferrite magnetic ring, and the number of turns of the twisted pair is 5 turns;

[0008] The impedance transformation unit includes a second ferrite ring, the size of the second ferrite ring is as follows: 60×35×25 mm, a twisted pair is wound around the second ferrite ring, and the number of turns of the twisted pair is 4 turns.

[0009] To facilitate connection, the shell includes an upper cover, an outer shell and a bottom plate. The outer shell is a hollow structure without a bottom or a cover. The upper end face and the lower end face of the outer shell are respectively connected to the upper cover and the bottom plate. A PCB board is provided on the bottom plate, and the PCB board is used to install various components of the synthesizer.

[0010] In order to facilitate disassembly and assembly, the upper cover, the outer shell and the bottom plate are fixedly connected by bolts.

[0011] In order to prevent internal overheating, a plurality of through holes are provided on the side end surface of the shell.

[0012] In order to facilitate input and output, the combined coupling port, input port and output port are installed on the housing.

[0013] In order to optimize and compensate for the individual indicators of the power combiner, chip capacitors are provided at the input and output ends of each unit.

[0014] Beneficial effects: Compared with the prior art, the utility model realizes an operating frequency of 0.8 to 10 MHz for the power combiner by selecting ferrite magnetic rings of specific specifications; after inspection, the rated power of the power combiner reaches 4×750W average power, and the isolation between the input ports of the power combiner is not less than 25dB. These two indicators are at the leading level among similar products at home and abroad. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view of the internal structure of a shortwave multiplexer;

[0016] Figure 2 It is a schematic diagram of the appearance of a shortwave multiplexer;

[0017] Figure 3 It is a schematic diagram of a shortwave multiplexer without a cover;

[0018] Figure 4 It is a schematic diagram of a shortwave multiplexer;

[0019] In the figure, 1, output port, 2, coupling port, 3, second ferrite ring, 4, first ferrite ring, 5, isolation load, 6, input port, 7, upper cover, 8, outer shell, 9, bottom plate. DETAILED DESCRIPTION

[0020] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0021] like Figure 1-4 As shown, output port 1, coupling port 2, second ferrite ring 3, first ferrite ring 4, isolation load 5, input port 6, upper cover plate 7, housing 8, bottom plate 9;

[0022] A shortwave multi-channel synthesizer comprises a housing, a coupling unit, a first-stage synthesis structure, a second-stage synthesis structure and a first-stage impedance transformation structure, wherein the first-stage synthesis structure comprises two first-stage synthesis units, the second-stage synthesis structure comprises a two-pole synthesis unit, and the first-stage impedance transformation structure comprises at least one impedance transformation unit;

[0023] The primary synthesis unit includes a first ferrite ring 4 and an isolation load 5; the secondary synthesis unit includes two stacked ferrite rings 4 and an isolation load 5. The size of the first ferrite ring 4 is as follows: 35×22×6mm. A twisted pair is wound around the first ferrite ring 4, and the number of turns of the twisted pair is 5.

[0024] The impedance transformation unit comprises a second ferrite ring 3 , the size of the second ferrite ring 3 is as follows: 60×35×25 mm, a twisted pair is wound around the second ferrite ring 3 , and the number of turns of the twisted pair is 4 turns.

[0025] The shell includes an upper cover plate 7, an outer shell 8 and a bottom plate 9. The outer shell 8 is a hollow structure without a bottom or a cover. The upper end face and the lower end face of the outer shell 8 are respectively connected to the upper cover plate 7 and the bottom plate 9. The side end face of the outer shell 8 is provided with a plurality of through holes. The upper cover plate 7, the outer shell 8 and the bottom plate 9 are fixedly connected by bolts. The ferrite magnetic ring, the load resistor and other connecting accessories contained in the power synthesizer are mounted on the PCB board, and the PCB board is mounted on the synthesizer bottom plate 9. The synthesized coupling port 2, the input port 6 and the output port 1 are mounted on the outer shell 8.

[0026] Since the selection of ferrite materials in the power synthesis unit must comprehensively consider many factors such as operating frequency, loss, heat dissipation, size and volume, the short-wave 4-way synthesizer described in this patent selects Material 75 ferrite magnetic ring. The first-stage 2-in-1 synthesis unit uses a single magnetic ring, the second-stage 2-in-1 synthesis unit uses a group of two magnetic rings, and the impedance transformation unit uses a larger magnetic ring.

[0027] The length of the single-strand wire or twisted-pair wire wound in each power synthesis, impedance transformation and directional coupling unit needs to be carefully optimized. On the one hand, the length of the wire and twisted-pair wire must be long enough to ensure that the winding magnetic ring can provide a large enough inductance; on the other hand, the length of the wire cannot be too long, otherwise it will affect the high-frequency indicators of the power synthesizer.

[0028] The shortwave 4-way synthesizer described in this patent also has chip capacitors of different capacitances installed at the input and output ends of each unit to optimize and compensate for individual indicators of the power synthesizer.

[0029] Working principle: The synthesizer adopts a 2-stage synthesis and a 1-stage impedance transformation structure. Both the power synthesis unit and the impedance transformation unit adopt a ferrite coaxial line transformation structure. In order to achieve an operating frequency of 0.8 to 10 MHz for the power synthesizer, the ferrite materials in the power synthesis unit and the impedance transformation unit need to be carefully selected and optimized.

[0030] The first-stage synthesis includes two 2-in-1 synthesis units, with a synthesizer input impedance of 50Ω and an output impedance of 25Ω. The synthesis unit is equipped with a 100Ω isolation load to ensure good isolation indicators of the synthesis unit.

[0031] The second-stage synthesis includes a 2-in-1 synthesis unit with a synthesizer input impedance of 25Ω and an output impedance of 12.5Ω. The synthesis unit is equipped with a 100Ω isolation load to ensure good isolation indicators of the synthesis unit.

[0032] Impedance conversion unit, input impedance 12.5Ω, output impedance 50Ω.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A shortwave multiplexer, characterized in that: It includes a housing, a coupling unit, a first-level synthesis structure, a second-level synthesis structure and a first-level impedance transformation structure, wherein the first-level synthesis structure includes two first-level synthesis units, the second-level synthesis structure includes a two-pole synthesis unit, and the first-level impedance transformation structure includes at least one impedance transformation unit; The primary synthesis unit includes a first ferrite magnetic ring and an isolation load; the dual-pole synthesis unit includes two stacked ferrite magnetic rings and an isolation load, the size of the first ferrite magnetic ring is as follows: 35×22×6mm, a twisted pair is wound around the first ferrite magnetic ring, and the number of turns of the twisted pair is 5; The impedance transformation unit includes a second ferrite ring, the size of the second ferrite ring is as follows: 60×35×25 mm, a twisted pair is wound around the second ferrite ring, and the number of turns of the twisted pair is 4 turns.

2. A shortwave multiplexer according to claim 1, characterized in that: The shell comprises an upper cover, an outer shell and a bottom plate. The outer shell is a hollow structure without a bottom or a cover. The upper end face and the lower end face of the outer shell are respectively connected to the upper cover and the bottom plate. A PCB board is arranged on the bottom plate. The PCB board is used to install various components of the synthesizer.

3. A shortwave multiplexer according to claim 2, characterized in that: The upper cover plate, the outer shell and the bottom plate are fixedly connected by bolts.

4. A shortwave multiplexer according to claim 2, characterized in that: The side end surface of the shell is provided with a plurality of through holes.

5. A shortwave multiplexer according to claim 2, characterized in that: The combined coupling port, input port and output port are mounted on the housing.

6. A shortwave multiplexer according to claim 1, characterized in that: Chip capacitors are provided at the input and output ends of each unit.

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