阅读说明：本技术 功率合成器 (Power combiner ) 是由 段齐 刘耿烨 于 2020-05-25 设计创作，主要内容包括：本发明公开了一种功率合成器。所述功率合成器包括：同轴输入结构,所述同轴输入结构包括多个输入端口；同轴输出结构,所述同轴输出结构包括一个输出端口；介于所述同轴输入结构与所述同轴输出结构之间的同轴低通滤波结构。本发明的功率合成器集成了滤波的功能,防止使用时对其他电子设备产生干扰。(The invention discloses a power combiner. The power combiner includes: a coaxial input structure comprising a plurality of input ports; a coaxial output structure, said coaxial output structure comprising an output port; a coaxial low pass filtering structure between the coaxial input structure and the coaxial output structure. The power synthesizer of the invention integrates the filtering function, and prevents interference to other electronic equipment during use.)

1. A power combiner, comprising:

a coaxial input structure comprising a plurality of input ports;

a coaxial output structure, said coaxial output structure comprising an output port;

a coaxial low pass filtering structure between the coaxial input structure and the coaxial output structure.

2. The power combiner of claim 1, wherein the coaxial low-pass filtering structure is a transmission line comprising a high impedance segment and a low impedance segment.

3. A power combiner as recited in claim 2, wherein said coaxial low-pass filtering structure comprises three high impedance segments and two low impedance segments.

4. A power combiner as recited in claim 2, wherein said transmission line is surface-silveredCoaxial cableA transmission line.

5. A power combiner as recited in claim 2, further comprising a coaxial impedance tapering structure fixedly connected between said coaxial input structure and said coaxial low pass filtering structure.

6. A power combiner as recited in claim 5, wherein said coaxial low-pass filtering structure further comprises an output connection matched to said coaxial output structure, and an input interface matched to said coaxial impedance grading structure.

7. The power combiner of claim 5, further comprising a metal casing surrounding the coaxial input structure, the coaxial impedance grading structure, and the coaxial low-pass filtering structure, the metal casing exposing the plurality of input ports.

8. A power combiner as recited in claim 1, wherein said coaxial output structure is a coaxial probe output structure.

9. A power combiner as recited in claim 1, further comprising a waveguide output port disposed in mating relation with said coaxial output structure.

10. The power combiner of claim 9, wherein the waveguide output port is a rectangular waveguide, a circular waveguide, or a ridge waveguide.

Technical Field

The embodiment of the invention relates to the technical field of power synthesis, in particular to a power synthesizer.

Background

With the development of the microwave technology, the application of the microwave technology is more and more extensive, the application fields of the microwave technology comprise mobile communication, radar, satellite communication, electronic countermeasure and the like, meanwhile, the microwave technology is greatly developed in the industrial field, the industrial microwave utilizes a kilowatt-level solid microwave source, the technical application of microwave drying, sewage treatment and the like can be realized, and the application prospect is wide. The technology of the high-power synthesizer in the industrial microwave field is a key part of a solid-state microwave source, so the requirement on the high-power synthesizer is high.

The existing high-power synthesizer does not have a filtering function, electromagnetic interference is easily generated to other electronic equipment when the synthesizer is used, in order to prevent the electromagnetic interference phenomenon, the existing high-power synthesizer is generally connected with a filtering device in a cascading mode when the synthesizer is used, namely the high-power synthesizer and the filtering device are two independent devices, the whole size is large, the miniaturization of the whole synthesizer size is not facilitated, and further application of the high-power synthesizer is limited.

Disclosure of Invention

The invention provides a power synthesizer, which has a filtering function and prevents interference to other electronic equipment.

An embodiment of the present invention provides a power combiner, where the power combiner includes: a coaxial input structure comprising a plurality of input ports; a coaxial output structure, said coaxial output structure comprising an output port; a coaxial low pass filtering structure between the coaxial input structure and the coaxial output structure.

Optionally, the coaxial low-pass filtering structure is a transmission line comprising a high impedance section and a low impedance section.

Optionally, the coaxial low-pass filtering structure comprises three high impedance segments and two low impedance segments.

Optionally, the transmission line is a coaxial transmission line with a silver-plated surface.

Optionally, the filter further comprises a coaxial impedance gradual change structure, and the coaxial impedance gradual change structure is fixedly connected between the coaxial input structure and the coaxial low-pass filter structure.

Optionally, the coaxial low-pass filtering structure further includes an output connector matched with the coaxial output structure, and an input interface matched with the coaxial impedance gradual change structure.

Optionally, the coaxial low-pass filter structure further includes a metal casing surrounding the coaxial input structure, the coaxial impedance gradual change structure, and the coaxial low-pass filter structure, where the metal casing exposes the plurality of input ports.

Optionally, the coaxial output structure is a coaxial probe output structure.

Optionally, the coaxial output structure further comprises a waveguide output port, and the waveguide output port is arranged in a matching manner with the coaxial output structure.

Optionally, the waveguide output port is a rectangular waveguide, a circular waveguide, or a ridge waveguide.

According to the technical scheme of the embodiment of the invention, the adopted power combiner comprises a coaxial input structure, and the coaxial input structure comprises a plurality of input ports; a coaxial output structure including an input port; a coaxial low pass filter structure between the coaxial input structure and the coaxial output structure. After receiving power signals input by the plurality of input ports, the power combiner firstly combines the plurality of power signals, then outputs the power signals through the coaxial output structure after filtering through the coaxial low-pass filtering structure, and the power signals output by the coaxial output structure cannot interfere other electronic equipment due to filtering. And the coaxial low-pass filtering structure can be integrated in the power synthesizer, so that the integration level is higher, and the miniaturization of the whole equipment adopting the power synthesizer is more facilitated.

Drawings

Fig. 1 is a schematic structural diagram of a power combiner according to an embodiment of the present invention;

fig. 2 is a diagram illustrating simulation results of a power combiner according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Fig. 1 is a schematic structural diagram of a power combiner according to an embodiment of the present invention, and referring to fig. 1, the power combiner includes: a coaxial input structure 10 comprising a plurality of input ports 101; a coaxial output structure 20, said coaxial output structure 20 comprising an output port; a coaxial low pass filter structure 30 interposed between the coaxial input structure 10 and the coaxial output structure 20.

Specifically, the power combiner of this embodiment is a coaxial radial structure, the coaxial input structure, the coaxial output structure, and the coaxial low-pass filter structure have the same axis, the radial structure means a multi-path air dielectric non-resonant transmission line structure, the coaxial input structure may include a radial waveguide 102, the plurality of input ports 101 are uniformly distributed on the coaxial waveguide 102, the size of the radial waveguide 102 may be determined according to the number of paths to be combined, so that the plurality of input ports may be uniformly distributed on the radial waveguide, the input ports 101 may be, for example, coaxial waveguides, rectangular waveguides, or ridge waveguides, and the input ports 101 may include an inner conductor and an outer conductor. The power combiner can realize multi-path input, namely, multi-path input power signals are respectively input from corresponding input ports 101, then are fed into the radial waveguide 102, are combined into one path of signal in the radial waveguide 102, and are output through an output port; in this embodiment, by providing the coaxial low-pass filtering structure 30 between the coaxial input structure 10 and the coaxial output structure 20, the power signals input by the plurality of input ports 101 are filtered by the coaxial low-pass filtering structure 30 and then output through the output port, that is, the power signals output by the output port are filtered, and no interference is generated on other electronic devices. The coaxial low-pass filtering structure 30 is integrated inside the power combiner, and when the power combiner of the embodiment is used, an additional cascaded filtering device is not needed, so that the overall size of equipment using the power combiner is reduced, and the application range of the power combiner is expanded.

According to the technical scheme of the embodiment, the adopted power combiner comprises a coaxial input structure, and the coaxial input structure comprises a plurality of input ports; a coaxial output structure including an input port; a coaxial low pass filter structure between the coaxial input structure and the coaxial output structure. After receiving power signals input by the plurality of input ports, the power combiner firstly combines the plurality of power signals, then outputs the power signals through the coaxial output structure after filtering through the coaxial low-pass filtering structure, and the power signals output by the coaxial output structure cannot interfere other electronic equipment due to filtering. And the coaxial low-pass filtering structure can be integrated in the power synthesizer, so that the integration level is higher, and the miniaturization of the whole equipment adopting the power synthesizer is more facilitated.

In this case, a plurality of input ports of the power combiner may be used as a plurality of output ports of the power divider, and an output port of the power combiner may be used as an input port of the power divider.

Optionally, with continued reference to fig. 1, the coaxial low-pass filtering structure 30 is a transmission line comprising a high impedance segment 301 and a low impedance segment 302.

Specifically, the number of the high impedance section 301 and the low impedance section 302 in the coaxial low-pass filter structure 30 can be a plurality of, the high impedance section and the low impedance section are arranged by taking the middle high impedance section as a central interval, and the axial lengths of different low impedance sections can be the same or different, the axial lengths of different high impedance sections can be the same or different, the coaxial low-pass filter structure is realized through the high impedance section 301 and the low impedance section 302, the coaxial low-pass filter structure has the advantages of simple structure, easy manufacture and the like, and the coaxial low-pass filter structure formed by the high impedance section and the low impedance section is integrated with an output port more easily, thereby being beneficial to the integration of the coaxial low-pass filter structure inside a power combiner. Illustratively, the coaxial low-pass filter structure 30 includes three high-impedance segments 301 and two low-impedance segments 302, and the number of the high-impedance segments 301 and the low-impedance segments 302 is smaller, which is more beneficial to the miniaturization of the power combiner.

Optionally, the transmission line is a surface-silvered coaxial transmission line.

Specifically, the transmission line may be made of a material such as aluminum alloy or stainless steel, and the surface of the transmission line is plated with a layer of silver, and the transmission line made of aluminum alloy or stainless steel has the advantages of low cost, easy manufacturing, and the like.

Optionally, with continuing reference to fig. 1, the power combiner further includes a coaxial impedance tapering structure 40, and the coaxial impedance tapering structure 40 is fixedly connected between the coaxial input structure 10 and the coaxial low-pass filtering structure 30.

Specifically, the coaxial impedance gradual change structure 40 can implement impedance matching between the coaxial input structure 10 and the coaxial output structure 20, so as to reduce energy dissipation of the power combiner during use, and further improve performance of the power combiner. The coaxial impedance gradual change structure 40 can include a first coaxial impedance gradual change structure 401 and a second coaxial impedance gradual change structure 402, the first coaxial impedance gradual change structure 401 and the second coaxial impedance gradual change structure 402 are both in a round table shape, the bottom surface of the first coaxial impedance gradual change structure 401 completely coincides with the top surface of the second coaxial impedance gradual change structure 402, and the impedance gradual change relations of the first coaxial impedance gradual change structure 401 and the second coaxial impedance gradual change structure 402 are different, through setting the two coaxial impedance gradual change structures of the first coaxial impedance gradual change structure 401 and the second coaxial impedance gradual change structure 402, on the one hand, good impedance matching can be realized, on the other hand, the bandwidth can be expanded, and effective transmission of electromagnetic waves is ensured.

Optionally, the coaxial low-pass filtering structure 40 further includes an output connector 303 matched with the coaxial output structure 20, and an input interface 304 matched with the coaxial impedance tapering structure 40.

Specifically, the meaning of matching the output connector 303 with the coaxial output structure 20 is that the output connector 303 and the coaxial output structure 20 can realize good fixed connection and signal transmission, and the output connector 303 and the input connector 304 can be both of probe structures, for example, which can realize both fixed connection with the coaxial output structure 20 and the coaxial impedance gradual change structure 40 and good signal transmission, and ensure stable operation of the power combiner.

Optionally, with continued reference to fig. 1, the power combiner further includes a metal casing 50 surrounding the coaxial input structure 10, the coaxial impedance tapering structure 40, and the coaxial low-pass filtering structure 30, and the metal casing 50 exposes the plurality of input ports 101.

Specifically, the coaxial input structure 10, the coaxial impedance gradual change structure 40 and the coaxial low-pass filter structure 30 are inner conductors, the metal shell is an outer conductor, air is filled between the inner conductor and the outer conductor, the shape of the outer conductor is matched with that of the inner conductor, for example, when the diameter of the inner conductor is smaller, the diameter of the outer conductor is also smaller, and by arranging the outer conductor outside the inner conductor, the bandwidth and the power capacity of the power combiner can be increased, so that the requirements of ultra wide band and high power of the power combiner are met.

Optionally, with continued reference to fig. 1, coaxial output structure 20 is a coaxial probe output structure.

Specifically, the power capacity of coaxial probe output structure is great, and maximum field intensity is one order of magnitude less than air breakdown field intensity (30000V/cm) under 6KW power to can satisfy powerful demand, the power synthesizer can reach the kilowatt level, adopts coaxial probe output structure simultaneously can also realize with coaxial radial structure good being connected, like coaxial probe structure can realize good being connected with coaxial low pass filter structure in this embodiment.

Optionally, with continued reference to fig. 1, the power combiner further includes a waveguide output port 60, the waveguide output port 60 being disposed in mating relation with the coaxial output structure 20.

Illustratively, the waveguide output port 60 may be, for example, a rectangular waveguide, a circular waveguide, a ridge waveguide, or the like, which enables connection of the power combiner with other microwave systems.

The simulation is performed by taking an 8-path power combiner as an example, as shown in fig. 2, fig. 2 is a simulation result diagram of the power combiner provided by the embodiment of the present invention, and as can be seen from fig. 2, the power combiner can realize power synthesis at 2.45GHz, return loss is less than-20 dB, insertion loss is less than 0.2dB, and suppression of the second harmonic of 2.45GHz exceeds 20dB, so that the use requirement of the solid-state microwave source can be well satisfied.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.