Radial waveguide power synthesis amplifier

Abstract

The invention relates to the technical field of electronics, and discloses a radial waveguide power synthesis amplifier which comprises two radial waveguide power synthesis distributors and a plurality of power units, the two radial waveguide power synthesis distributors are arranged in parallel at intervals, and waveguide cavities are formed in the radial waveguide power synthesis distributors. A center feed probe and a plurality of branch feed probes are arranged in the waveguide cavity, and a plurality of first connectors which are coaxially and correspondingly connected with the branch feed probes one by one are arranged on the opposite surfaces of the two radial waveguide power synthesis distributors respectively; the plurality of power units are connected between the two radial waveguide power synthesis distributors at intervals along the circumferential direction, one end of each power unit is connected with one first connector on one radial waveguide power synthesis distributor, and the other end of each power unit is connected with one first connector on the other radial waveguide power synthesis distributor. The power capacity is large, the insertion loss is small, and the use flexibility is high.

Description

Technical Field

[0001] The present invention relates to the field of electronic technologies, and particularly to a radial waveguide power combining amplifier. Background Art

[0002] As a core component of microwave and millimeter-wave communication systems, power amplifiers have always been an important topic in the research of microwave and millimeter-wave theories and technologies. In microwave and millimeter-wave communication systems, vacuum electronic devices still have advantages in terms of high power and high efficiency. However, their disadvantages are also obvious. They are not only expensive but also difficult to implement in terms of technology. With the wide application of microwave and millimeter-wave technologies in many fields such as communication, radar, navigation, and remote sensing, the demand for corresponding solid-state power devices is becoming more and more urgent. However, due to the limited output power of a single solid-state power device, it is difficult to obtain a large power output. To obtain a large power output, power combining technology must be adopted. In power combining technology, the combining efficiency is one of the most important requirements. The inconsistency of amplitude and phase has a great impact on the combining efficiency. Moreover, the radial waveguide belongs to the type of waveguide transmission line, which has advantages such as small insertion loss, large power capacity, and wide operating bandwidth. In existing radial waveguide combining amplifiers, the power capacity and insertion loss still need to be optimized. Summary of the Invention

[0003] Based on the above, the purpose of the present invention is to provide a radial waveguide power combining amplifier with a relatively large power capacity, a relatively small insertion loss, and relatively high flexibility in use.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A radial waveguide power combining amplifier includes two radially waveguide power combining and dividing devices arranged in parallel at intervals and a plurality of power units;

[0006] A waveguide cavity is provided in the radially waveguide power combining and dividing device, a central feeding probe and a plurality of shunt feeding probes are provided in the waveguide cavity, and a plurality of first connectors coaxially corresponding to and connected to the plurality of shunt feeding probes are respectively provided on the opposite surfaces of the two radially waveguide power combining and dividing devices.

[0007] A plurality of the power units are connected at intervals in the circumferential direction between the two radially waveguide power combining and dividing devices. One end of each power unit is detachably connected to one of the first connectors on one of the radially waveguide power combining and dividing devices, and the other end is detachably connected to one of the first connectors on the other radially waveguide power combining and dividing device.

[0008] As a preferred solution for a radial waveguide power combining amplifier, the radial waveguide power combining and distributing device includes a waveguide cavity plate and a waveguide cover plate. The waveguide cavity plate includes a waveguide bottom plate and waveguide side plates surrounding the outer periphery of the waveguide bottom plate. The waveguide cover plate is connected to the waveguide side plates, and a waveguide cavity is formed between the waveguide bottom plate, the waveguide side plates, and the waveguide cover plate.

[0009] As a preferred solution for a radial waveguide power combining amplifier, both the waveguide bottom plate and the waveguide cover plate are circular.

[0010] As a preferred solution for a radial waveguide power combining amplifier, the central feeding probe is located at the center of the waveguide bottom plate, and a plurality of the shunt feeding probes are arranged in a centrally symmetric and equidistant radial pattern on the waveguide cover plate.

[0011] As a preferred solution for a radial waveguide power combining amplifier, the waveguide cover plate is connected to the waveguide side plates by bolts.

[0012] As a preferred solution for a radial waveguide power combining amplifier, the first connector is arranged on the waveguide cover plate, a second connector is arranged on the waveguide bottom plate, and the central feeding probe is coaxially connected to the second connector.

[0013] As a preferred solution for a radial waveguide power combining amplifier, the shunt feeding probe includes a shunt connection section and a shunt inductance section. Both the shunt connection section and the shunt inductance section are cylindrical. The cross-sectional diameter of the shunt connection section is smaller than the cross-sectional diameter of the shunt inductance section. One end of the shunt connection section facing away from the shunt inductance section is connected to the first connector;

[0014] The central feeding probe includes a central connection section and a central inductance section. Both the central connection section and the central inductance section are cylindrical. The cross-sectional diameter of the central connection section is smaller than the cross-sectional diameter of the central inductance section. One end of the central connection section facing away from the central inductance section is connected to the second connector.

[0015] As a preferred solution for a radial waveguide power combining amplifier, a shunt connection groove is axially formed on the shunt connection section, and the inner core of the first connector is inserted into the shunt connection groove;

[0016] A central connection groove is axially formed on the central connection section, and the inner core of the second connector is inserted into the central connection groove.

[0017] As a preferred solution for a radial waveguide power combining amplifier, the number of power units is 16.

[0018] As a preferred embodiment of a radial waveguide power combining amplifier, the power unit includes a power amplification chip.

[0019] The beneficial effects of the present invention are as follows:

[0020] The present invention provides a radial waveguide power combining amplifier, which includes two radially spaced and parallel waveguide power combining and dividing devices and several power units. By connecting multiple power units between the two radially spaced waveguide power combining and dividing devices, signal energy is input from a central feeding probe. The central feeding probe excites a TM00 wave in the waveguide cavity, and its energy is coupled to each shunt feeding probe. The equal-amplitude and co-directional signal energy fed into each shunt feeding probe is output from another central feeding probe, realizing signal combination. That is, after the input signal passes through a radially spaced waveguide power combining and dividing device, the input power is evenly divided into multiple paths and distributed to multiple power units. After the multiple power units are respectively power amplified, the multiple-path signal powers are combined and output through another radially spaced waveguide power combining and dividing device, realizing power amplification and obtaining a larger power output. At the same time, the power units can be adjusted or replaced according to the total power requirement, making the replacement of the power units flexible and convenient, and the flexibility of use is relatively high. The radial waveguide power combining amplifier has a large power capacity, a small insertion loss, and a high flexibility of use. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the content of the embodiments of the present invention and these drawings.

[0022] Figure 1 is a cross-sectional view of the radial waveguide power combining amplifier provided by the embodiment of the present invention;

[0023] Figure 2 is a bottom view of the radially spaced waveguide power combining and dividing device provided by the embodiment of the present invention;

[0024] Figure 3 is a top view of the radially spaced waveguide power combining and dividing device provided by the embodiment of the present invention;

[0025] Figure 4 is Figure 3 a cross-sectional view from the A-A perspective in

[0026] Figure 5 is a cross-sectional view of the waveguide cavity plate provided by the embodiment of the present invention;

[0027] Figure 6It is a cross-sectional view of the waveguide cover plate provided by an embodiment of the present invention;

[0028] Figure 7 It is a cross-sectional view of the center-fed probe provided by an embodiment of the present invention;

[0029] Figure 8 It is a cross-sectional view of the shunt-fed probe provided by an embodiment of the present invention;

[0030] Figure 9 It is a graph of the return loss (S11) of two center ports of the radial waveguide power combining amplifier provided by an embodiment of the present invention;

[0031] Figure 10 It is a graph of the insertion loss (S21) between two center ports of the radial waveguide power combining amplifier provided by an embodiment of the present invention.

[0032] In the figure:

[0033] 1. Radial waveguide power combining and distributing device; 10. Waveguide cavity; 11. Waveguide cavity plate; 12. Waveguide cover plate; 13. Center-fed probe; 131. Center connection section; 132. Center inductance section; 14. Shunt-fed probe; 141. Shunt connection section; 142. Shunt inductance section; 15. First connector; 16. Second connector; 2. Power unit. Detailed implementation manners

[0034] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings rather than all structures.

[0035] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationship terms such as "upper", "lower", "left" and "right" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more. In addition, the terms "first" and "second" are only used for descriptive distinction and have no special meaning.

[0038] Such as Figures 1 to 8As shown in the figure, this embodiment provides a radial waveguide power combining amplifier. The radial waveguide power combining amplifier includes two radially waveguide power combining and dividing distributors 1 arranged in parallel at intervals and several power units 2. A waveguide cavity 10 is provided in the radially waveguide power combining and dividing distributor 1. A central feeding probe 13 and a plurality of shunt feeding probes 14 are provided in the waveguide cavity 10. A plurality of first connectors 15 that are coaxially and correspondingly connected to the plurality of shunt feeding probes 14 are respectively provided on the opposite surfaces of the two radially waveguide power combining and dividing distributors 1. The several power units 2 are circumferentially connected between the two radially waveguide power combining and dividing distributors 1 at intervals. One end of each power unit 2 is detachably connected to one of the first connectors 15 on one of the radially waveguide power combining and dividing distributors 1, and the other end is detachably connected to one of the first connectors 15 on the other radially waveguide power combining and dividing distributor 1. By connecting a plurality of power units 2 between the two radially waveguide power combining and dividing distributors 1, signal energy is input from a central feeding probe 13. The central feeding probe 13 excites the TM00 wave in the waveguide cavity 10, and its energy will be coupled to each shunt feeding probe 14. And the equal-amplitude and in-phase signal energy fed on each shunt feeding probe 14 will be output from the other central feeding probe 13 to achieve signal synthesis. That is, after the input signal passes through one radially waveguide power combining and dividing distributor 1, the input power is evenly divided into multiple paths and distributed to the plurality of power units 2. After the multiple-path power units 2 are respectively power-amplified, the multiple-path signal powers are combined and output through the other radially waveguide power combining and dividing distributor 1 to achieve power amplification and obtain a larger power output. At the same time, the power units can be adjusted or replaced according to the total power requirement, making the replacement of the power units flexible and convenient, and the usage flexibility is relatively high. This radial waveguide power combining amplifier has a large power capacity, a small insertion loss, and a high usage flexibility.

[0039] In this embodiment, the number of power units 2 is 16, and the 16 power units 2 are symmetrically distributed between the two radially waveguide power combining and dividing distributors 1. Among them, the power unit 2 includes a power amplification chip. For example, the power amplification chip selects the NC11635C-1018P22 power amplification chip of the 13th Research Institute of CETC, with a maximum output power of about 20W. The output power of the 16-path power units 2 can reach 320W.

[0040] Further, as Figures 2 to 6 shown, each radially waveguide power combining and dividing distributor 1 includes a waveguide cavity plate 11 and a waveguide cover plate 12. The waveguide cavity plate 11 includes a waveguide bottom plate and a waveguide side plate surrounding the outer periphery of the waveguide bottom plate. The waveguide cover plate 12 is connected to the waveguide side plate. A waveguide cavity 10 is formed between the waveguide bottom plate, the waveguide side plate, and the waveguide cover plate 12.

[0041] Preferably, both the waveguide cavity plate 11 and the waveguide cover plate 12 are aluminum discs, that is, both the waveguide bottom plate and the waveguide cover plate 12 are circular.

[0042] Exemplarily, the waveguide cover plate 12 is connected to the waveguide side plate by bolts, which has a simple structure, is easy to assemble and disassemble, and has a low cost.

[0043] In this embodiment, the central feeding probe 13 is located at the center of the waveguide base plate, and a plurality of branch feeding probes 14 are arranged on the waveguide cover plate 12 in a centrally symmetrical and equidistant radial pattern, so that the central feeding probe excites a TM00 wave in the waveguide cavity 10, and its energy can be evenly coupled to each branch feeding probe 14 to maintain consistent amplitude and phase.

[0044] Specifically, the first connector 15 is arranged on the waveguide cover plate 12, the second connector 16 is arranged on the waveguide bottom plate, and the center feed probe 13 is coaxially connected to the second connector 16. That is, the first connector 15 and the second connector 16 are located on opposite sides of the radial waveguide power synthesis distributor 1, which is convenient for the input and output of signals and the connection of the power unit 2.

[0045] Preferably, the first connector 15 and the second connector 16 are SMA-K connectors, and the two ends of the power unit 2 are connected to the SMA-K connectors on the two radial waveguide power synthesis distributors 1 through SMA-JJ connectors. The power unit can be adjusted or replaced according to the total power demand. Due to the use of a detachable structure and a standard interface form, the power unit can be replaced flexibly and conveniently, and the use flexibility is high.

[0046] Furthermore, if Figure 1 , Figure 7 and Figure 8 As shown, the shunt feeding probe 14 includes a shunt connecting section 141 and a shunt inductor section 142, both of which are cylindrical, the cross-sectional diameter of the shunt connecting section 141 is smaller than the cross-sectional diameter of the shunt inductor section 142, and the end of the shunt connecting section 141 away from the shunt inductor section 142 is connected to the first connector 15; the central feeding probe 13 includes a central connecting section 131 and a central inductor section 132, both of which are cylindrical, the cross-sectional diameter of the central connecting section 131 is smaller than the cross-sectional diameter of the central inductor section 132, and the end of the central connecting section 131 away from the central inductor section 132 is connected to the second connector 16. Preferably, the branch feeding probe 14 and the center feeding probe 13 are both made of metal materials, and the branch feeding probe 14 and the center feeding probe 13 are in a "mushroom" shape. The branch connecting section 141 and the center connecting section 131 play a feeding and supporting role. The branch inductance section 142 and the center inductance section 132 themselves can be equivalent to inductance, and the upper surface and the wall of the waveguide cavity 10 can be equivalent to capacitance. By adjusting its size, the impedance of the probe feeding interface can be changed to achieve matching of input and output signals.

[0047] In this embodiment, a shunt connection groove is axially formed on the shunt connection section 141, and the inner core of the first connector 15 is inserted into the shunt connection groove; a central connection groove is axially formed on the central connection section 131, and the inner core of the second connector 16 is inserted into the central connection groove. The shunt connection groove and the central connection groove facilitate tin injection during soldering with the first connector 15 and the second connector 16 respectively.

[0048] Exemplarily, the radial waveguide radius of the radial waveguide power combining amplifier provided in this embodiment is 38.7 mm, the radial waveguide height is 5.5 mm, the radius of the connection section of the central feeding probe 13 is 0.65 mm, the length is 1.45 mm, the radius of the inductance section is 1.8 mm, the length is 2.85 mm, the radius of the connection section of the shunt feeding probe 14 is 0.65 mm, the length is 2.1 mm, the radius of the inductance section is 1.5 mm, the length is 1.9 mm, and the position radius of the shunt feeding probe 14 is 33 mm. The radial waveguide power combining amplifier provided in this embodiment is tested. The radial waveguide power combining and distributing device 1 is assembled with the power unit 2, and each power unit 2 shares the gate and the drain. To ensure the saturated output of the power unit 2, a two-stage driving amplifier is used to provide sufficient input power. The first-stage driving provides about 0.5 W of power by HMC559, and then is amplified to about 20 W of power by the second-stage driving NC11635C-1018P22. This power is first reversely 16-way divided by the combiner to each power unit 2, and then combined and output after being amplified by the power unit 2. Table 1 shows the test results of 16 power units 2, and Table 2 shows the test results of the power combining efficiency of the radial combined power amplifier. The test signal is a low-duty-cycle pulse modulation signal, and the working mode of gate and drain modulation is adopted, and the power supply voltage is +28V.

[0049] Table 1 Test Results of Power Unit

[0050]

[0051]

[0052] Table 2 Test Results of Output Power of Radial Combined Power Amplifier

[0053]

[0054] The working frequency band of the radial waveguide power combining amplifier provided in this embodiment is 10 GHz - 18 GHz, and the output power can reach about 50 dBm.

[0055] The insertion loss test is carried out on the radial waveguide power combining amplifier provided in this embodiment. The return loss S11 of two central ports and the insertion loss S21 therebetween are measured by a network analyzer, as Figure 9 and Figure 10As shown, the insertion loss is basically maintained at about -0.5 dB (i.e., the transmission loss of a single-stage synthesizer is about 0.25 dB), and the return loss S11 of the two center ports and the insertion loss S21 therebetween are small.

[0056] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A radial waveguide power combining amplifier, characterized in that It includes two radially waveguide power combining and distributing devices arranged in parallel with a gap therebetween and several power units; A waveguide cavity is provided in the radially waveguide power combining and distributing device. A central feeding probe and a plurality of shunt feeding probes are provided in the waveguide cavity. A plurality of first connectors respectively corresponding to the plurality of shunt feeding probes coaxially are provided on the opposite surfaces of the two radially waveguide power combining and distributing devices. The several power units are connected to each other at intervals in the circumferential direction between the two radially waveguide power combining and distributing devices. One end of each power unit is detachably connected to one of the first connectors on one of the radially waveguide power combining and distributing devices, and the other end is detachably connected to one of the first connectors on the other radially waveguide power combining and distributing device.

2. The radial waveguide power combining amplifier according to claim 1, wherein The radially waveguide power combining and distributing device includes a waveguide cavity plate and a waveguide cover plate. The waveguide cavity plate includes a waveguide bottom plate and a waveguide side plate surrounding the outer periphery of the waveguide bottom plate. The waveguide cover plate is connected to the waveguide side plate. The waveguide cavity is formed among the waveguide bottom plate, the waveguide side plate and the waveguide cover plate.

3. The radial waveguide power combining amplifier according to claim 2, wherein Both the waveguide bottom plate and the waveguide cover plate are circular.

4. The radial waveguide power combining amplifier according to claim 3, wherein The central feeding probe is located at the center of the waveguide bottom plate. The plurality of shunt feeding probes are arranged in a centrally symmetric and equidistant radial pattern on the waveguide cover plate.

5. The radial waveguide power combining amplifier according to claim 2, wherein The waveguide cover plate and the waveguide side plate are connected by bolts.

6. The radial waveguide power combining amplifier according to claim 2, characterized in that, The first connector is provided on the waveguide cover plate. A second connector is provided on the waveguide bottom plate. The central feeding probe is coaxially connected to the second connector.

7. The radial waveguide power combining amplifier according to claim 6, characterized in that The shunt feeding probe includes a shunt connection section and a shunt inductance section. Both the shunt connection section and the shunt inductance section are cylindrical. The cross-sectional diameter of the shunt connection section is smaller than that of the shunt inductance section. One end of the shunt connection section departing from the shunt inductance section is connected to the first connector; The central feeding probe includes a central connection section and a central inductance section. Both the central connection section and the central inductance section are cylindrical. The cross-sectional diameter of the central connection section is smaller than that of the central inductance section. One end of the central connection section departing from the central inductance section is connected to the second connector.

8. The radial waveguide power combining amplifier according to claim 7, characterized in that A shunt connection groove is axially formed on the shunt connection section. The inner core of the first connector is inserted into the shunt connection groove; A central connection groove is axially formed on the central connection section. The inner core of the second connector is inserted into the central connection groove.

9. The radial waveguide power combining amplifier according to claim 1, wherein The number of the power units is 16.

10. The radial waveguide power combining amplifier according to claim 1, characterized in that, The power unit includes a power amplification chip.

Images