A hybrid three-power filter

Abstract

The present invention provides a hybrid three-power-division filter, which relates to the technical field of radio frequency microwave circuits, and comprises: a coaxial line, which is used to transmit an input signal along a first direction; three output rectangular waveguides are arranged at equal angles along the radial direction of the coaxial line, and are used to output the signal along a second direction; a dielectric substrate, which is assembled on the cross section of the coaxial line and the E-plane of the three rectangular waveguides, and the dielectric substrate is composed of a laid coaxial probe, an impedance conversion circuit, a microstrip bandpass filter and a microstrip-waveguide transition conversion circuit; the present invention provides a structural mode of combining a coaxial line planar probe with a rectangular waveguide E-plane dielectric loading circuit to realize a circuit structure of a hybrid coaxial-radial waveguide with three-way power division and outputting signals in a specific frequency band.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency microwave circuits, and in particular to a hybrid three-power division filter. Background Art

[0002] Power dividers and filters are both basic passive functional devices commonly used in various electromagnetic wave systems. Power dividers can realize two-way or multi-way power distribution and synthesis of input signal power, while filters can only allow signals with specific frequency components in the signal to pass. After integrating the power divider and the bandpass filter into one component, the function of signal power distribution within a specific frequency band can be realized simultaneously. This type of power divider filter with filtering response has a wide range of applications in wireless multi-band communication systems in improving antenna carrier-to-noise ratio performance.

[0003] Rectangular waveguide and coaxial line are two common types of circuit structures in engineering applications. Rectangular waveguide has the characteristics of high power capacity and low insertion loss, while coaxial line belongs to a dual-conductor waveguide system structure. The main transmission mode is TEM mode, and it can also transmit in TE mode and TM mode. It has the characteristics of no cut-off frequency limit and wide bandwidth. It is very common to use rectangular waveguide and coaxial line to design power divider and filter circuits separately, and to use these two types of waveguide systems to combine to realize component circuits with power division-filtering functions. However, in the circuit with coaxial line as the signal input end and rectangular waveguide set in the radial direction of the coaxial line as the output end, the relative position of the coaxial line and the rectangular waveguide port of the existing power divider or power divider filter circuit is mainly realized in a structural manner that the E-plane of the rectangular waveguide is parallel to the axial direction of the coaxial line. Therefore, in existing engineering applications, there is a circuit design requirement that the axial direction of the coaxial line and the E-plane of the rectangular waveguide have a direct vertical structure that cannot be met. Summary of the invention

[0004] The present invention provides a circuit structure that can use a coaxial line as an input end and a rectangular waveguide as an output end, and can realize a coaxial-radial waveguide three-power division filter function in which the axial direction of the coaxial line is perpendicular to the E-surface of the rectangular waveguide and signal power distribution and transmission is performed within a specific frequency band by adopting a hybrid mode of a coaxial planar probe and a rectangular waveguide E-surface loaded dielectric substrate circuit.

[0005] The present invention provides a hybrid three-power-division filter, comprising:

[0006] A coaxial line, used for transmitting an input signal along a first direction;

[0007] There are three output rectangular waveguides, which are arranged at equal angles along the radial direction of the coaxial line, and the output signal transmission direction of the rectangular waveguides is arranged along the second direction, and the first direction is perpendicular to the second direction;

[0008] A dielectric substrate, comprising a first bearing part, three second bearing parts, three third bearing parts and a fourth bearing part; the first bearing part is circular, mounted on the cross section of the coaxial line and arranged cocentrically with the coaxial line; the three second bearing parts are distributed at equal angles along the radial direction of the coaxial line and mounted on the position of the E-surface of the output rectangular waveguide; the three third bearing parts are mounted on the metal outer cavity wall of the coaxial line, and the two ends of the third bearing parts are respectively connected to the first bearing part and the second bearing part; the fourth bearing part is a circular ring structure, mounted in the groove of the metal outer cavity wall of the coaxial line, and connected to the third bearing part, and the fourth bearing part is arranged cocentrically with the coaxial line;

[0009] The functional circuits are arranged on the upper surface of the dielectric substrate, and a coaxial probe is arranged at one end of each of the functional circuits, and the coaxial probe extends into the coaxial line along the radial direction of the coaxial line, and the other end of the functional circuit passes through the outer cavity wall of the coaxial line and extends into the output rectangular waveguide.

[0010] According to the hybrid three-power division filter provided by the present invention, the coaxial line includes a first coaxial line, a second coaxial line and a third coaxial line that are coaxially connected, the inner conductor diameters of the first coaxial line and the second coaxial line are the same, and the inner conductor diameter of the second coaxial line is smaller than the inner conductor diameter of the third coaxial line; the inner diameter of the outer conductor of the first coaxial line is smaller than the inner diameter of the outer conductor of the second coaxial line, the inner diameter of the outer conductor of the second coaxial line and the third coaxial line is the same, and the first bearing portion is assembled on the cross section of the third coaxial line.

[0011] According to the hybrid three-power-division filter provided by the present invention, the second bearing portion is located at the center of the wide side of the output rectangular waveguide.

[0012] According to the hybrid three-power-division filter provided by the present invention, the functional circuit also includes an impedance transformation circuit, a microstrip bandpass filter and a microstrip-waveguide transition conversion circuit, one end of the impedance transformation circuit is connected to the coaxial probe, the other end of the impedance transformation circuit is connected to the microstrip bandpass filter, and the other end of the microstrip bandpass filter is connected to the microstrip-waveguide transition conversion circuit.

[0013] According to the hybrid three-power-division filter provided by the present invention, the microstrip-waveguide transition conversion circuit adopts a magnetic excitation coupling method of a ring-shaped metal strip structure to realize the transition conversion between the microstrip line and the rectangular waveguide.

[0014] According to the hybrid three-power-division filter provided by the present invention, the annular metal strip structure is a rectangular annular circuit, and a disconnection portion is provided on a straight line segment of the rectangular annular circuit on a side adjacent to the microstrip bandpass filter and constituting the rectangular annular circuit, so that the rectangular annular circuit has two connecting portions, and the microstrip bandpass filter circuit is connected to one of the connecting portions.

[0015] According to the hybrid three-power-division filter provided by the present invention, another of the connecting parts is connected to a grounding wire, which extends from the wide side of the output rectangular waveguide and is grounded through the metal outer cavity wall of the output rectangular waveguide.

[0016] According to the hybrid three-power-division filter provided by the present invention, an isolation resistor is provided between each two adjacent output rectangular waveguide output channels, and the isolation resistor is mounted on the fourth bearing portion.

[0017] According to the hybrid three-power-division filter provided by the present invention, the dielectric substrate is provided with a circular through hole at the concentric position of the inner conductor of the third coaxial line, and the diameter of the circular through hole is larger than the diameter of the inner conductor of the third coaxial line.

[0018] According to the hybrid three-power-division filter provided by the present invention, the third coaxial line terminal is short-circuited.

[0019] According to the hybrid three-power-division filter provided by the present invention, the inner conductor diameter and the inner diameter of the outer conductor of the first coaxial line are set according to the size that can transmit the TEM main mode at the operating frequency and the characteristic impedance is 50 ohms.

[0020] According to the hybrid three-power-division filter provided by the present invention, the dielectric substrate is made of Rogers 5880 and has a thickness of 0.508 mm.

[0021] The present invention provides a hybrid three-power-division filter, which uses a coaxial line and an output rectangular waveguide as a signal input end and an output end respectively, arranges three output rectangular waveguides at an angle of 120° along the radial direction of the coaxial line, places dielectric substrates on the E surfaces of the three output rectangular waveguides and the cross-section of the coaxial line, and uses coaxial probes, impedance conversion circuits, microstrip bandpass filters and microstrip-waveguide transition conversion functional circuits laid on the dielectric substrate to finally realize a hybrid coaxial-radial waveguide three-power-division filter circuit structure; and can realize the use requirements of a three-power-division filter with different output powers between three output channels by changing the different physical structure sizes of three microstrip probes on the dielectric substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a hybrid three-power-division filter provided in an embodiment of the present invention;

[0024] Figure 2 A cross-sectional view of the circuit structure of any one of the three-power-division filters provided in an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the upper surface circuit of a dielectric substrate provided by an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of a circuit on the bottom surface of a dielectric substrate provided by an embodiment of the present invention;

[0027] Figure 5 A simulation result diagram of input echo and insertion loss of a hybrid three-power-division filter provided in an embodiment of the present invention;

[0028] Figure 6 A simulation result diagram of the output echo of a hybrid three-power-division filter provided in an embodiment of the present invention;

[0029] Figure 7 A diagram showing simulation results of isolation between output ports of a hybrid three-power-division filter provided in an embodiment of the present invention.

[0030] Reference numerals:

[0031] 1. coaxial line; 11. first coaxial line; 12. second coaxial line; 13. third coaxial line;

[0032] 2. dielectric substrate; 21. first bearing part; 22. second bearing part; 23. third bearing part; 24. fourth bearing part;

[0033] 3. Functional circuit; 31. Coaxial probe; 32. Impedance conversion circuit; 33. Microstrip bandpass filter; 34. Microstrip-waveguide transition conversion circuit; 35. Disconnection part; 36. Ground wire;

[0034] 4. Output rectangular waveguide; 5. Isolation resistor; 6. Circular through hole;

[0035] 7. Area without metal layer; 8. Area with copper clad layer on dielectric substrate. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Combine the following Figures 1 to 7 A hybrid three-power-division filter provided in an embodiment of the present invention is described.

[0038] This embodiment provides a hybrid three-power-division filter, such as Figure 1-Figure 4 As shown, it includes: a coaxial line 1, an output rectangular waveguide 4, a dielectric substrate 2 and a functional circuit 3.

[0039] The coaxial line 1 is used to input electromagnetic signals, and the axial direction of the coaxial line 1 is arranged vertically, perpendicular to the dielectric substrate 2, and the signal is transmitted along the axial direction of the coaxial line 1. Three output rectangular waveguides 4 are provided, and the three output rectangular waveguides 4 are arranged at equal angles along the radial direction of the coaxial line 1, that is, the angle between two adjacent output rectangular waveguides 4 is 120°, and the output signal transmission direction of the output rectangular waveguides 4 is arranged along the horizontal direction.

[0040] The dielectric substrate 2 includes a first bearing portion 21, three second bearing portions 22, three third bearing portions 23 and a fourth bearing portion 24. The first bearing portion 21 is circular, located on the cross section of the coaxial line 1, and is arranged cocentrically with the coaxial line 1; the three second bearing portions 22 are arranged at equal angles along the radial direction of the coaxial line 1, that is, the angle between two adjacent second bearing portions 22 is 120°, and the second bearing portion 22 is located on the E-plane inside the output rectangular waveguide 4; the three third bearing portions 23 are located in the outer cavity wall of the coaxial line 1 for the signal transmission channel, and the two ends are respectively connected to the first bearing portion 21 and the second bearing portion 22; the fourth bearing portion 24 is a circular ring structure, located in the groove of the metal outer cavity wall of the coaxial line 1, connected to the third bearing portion 23 and arranged cocentrically with the coaxial line 1.

[0041] The number of the functional circuits 3 and the second bearing parts 22 are the same and the positions correspond one to one. The functional circuits 3 are arranged on the upper surface of the dielectric substrate 2, and a coaxial probe 31 is arranged at one end of each functional circuit 3. The coaxial probe 31 extends into the coaxial line 1 along the radial direction of the coaxial line 1, and the other end of the functional circuit 3 passes through the outer cavity wall of the coaxial line 1 and extends into the output rectangular waveguide 4.

[0042] It can be seen from the above scheme that the present invention uses the coaxial line 1 and the output rectangular waveguide 4 as the input and output ends of the signal respectively, and adopts a structural method of combining a coaxial planar probe and an output rectangular waveguide E-plane dielectric loading circuit to realize a circuit structure of a hybrid coaxial-radial waveguide with three-way power division and output of a signal in a specific frequency band. The circuit structure is compact and easy to implement and install in engineering.

[0043] It should be noted that the use requirements of a three-power-dividing filter with different output powers between three output channels can be realized by changing the different physical structure sizes of the three coaxial probes 31 on the dielectric substrate 2. Moreover, based on the circuit structure, other circuits can be further integrated on the dielectric substrate 2 to design and realize circuit components with more functions, so that it has a wider application in microwave and millimeter wave circuits and systems.

[0044] In this embodiment, Figure 2 As shown, the coaxial line 1 includes a first coaxial line 11, a second coaxial line 12 and a third coaxial line 13 which are coaxially connected. The inner conductor diameters of the first coaxial line 11 and the second coaxial line 12 are the same, and the inner conductor diameter of the second coaxial line 12 is smaller than the inner conductor diameter of the third coaxial line 13; the inner diameter of the outer conductor of the first coaxial line 11 is smaller than the inner diameter of the outer conductor of the second coaxial line 12, and the inner diameters of the outer conductors of the second coaxial line 12 and the third coaxial line 13 are the same, and the terminal of the third coaxial line 13 is short-circuited. The first bearing portion 21 is assembled on the cross section of the third coaxial line 13; the second bearing portion 22 is assembled at the center position of the wide side of the waveguide in the rectangular waveguide.

[0045] Such an arrangement provides the coaxial probe 31 structure with an area size of the first bearing part 21 required in the circuit design that is more conducive to the three sections of coaxial lines with different sizes, wherein the inner conductor diameter and the inner diameter of the outer conductor of the first coaxial line 11 are set according to the size that can transmit the TEM main mode at the operating frequency and the characteristic impedance is 50 ohms, so that the port of the input interface can directly use a standard connector with an impedance of 50 ohms, while ensuring that the input signal is transmitted in the main mode (TEM mode); the second coaxial line 12 is used for connection and transition matching conversion between the first coaxial line 11 and the third coaxial line 13; the third coaxial line 13 increases the size of the internal circular ring area of ​​the coaxial line 1, which is more convenient to improve the flexibility of the coaxial probe circuit design and the feasibility of the cavity structure of the power division filter circuit.

[0046] like Figure 2 As shown, the best power distribution performance is obtained by optimizing the distance between the dielectric substrate 2 and the short-circuit surface (the bottom surface of the third coaxial line 13).

[0047] like Figure 3As shown, the functional circuit 3 also includes an impedance transformation circuit 32, a microstrip bandpass filter 33 and a microstrip-waveguide transition conversion circuit 34, one end of the impedance transformation circuit 32 is connected to the coaxial probe 31, the other end of the impedance transformation circuit 32 is connected to the microstrip bandpass filter 33, and the other end of the microstrip bandpass filter 33 is connected to the microstrip-waveguide transition conversion circuit 34.

[0048] In this embodiment, the microstrip bandpass filter 33 in the three output channels has a frequency selection function, which can only allow signals within the passband frequency range of the microstrip bandpass filter 33 to pass through, and suppress the passage of signals below or above this frequency band. By setting a specific passband frequency range, the signal power output within the specific frequency band is achieved.

[0049] In this embodiment, the microstrip-waveguide transition conversion circuit 34 in the three output channels adopts the magnetic excitation coupling method of the annular metal strip structure to realize the transition conversion between the microstrip line and the rectangular waveguide. The annular metal strip is a rectangular annular circuit, and the rectangular annular circuit is provided with a disconnection portion 35 on the straight line segment located on one side adjacent to the microstrip bandpass filter 33 and constituting the rectangular annular circuit, so that the rectangular annular circuit is formed with two connection portions, one of which is connected to the microstrip bandpass filter 33, and the other is connected to the grounding wire 36, and extends from the wide side of the output rectangular waveguide 4, and is grounded through the metal outer cavity wall of the output rectangular waveguide 4.

[0050] In this embodiment, an isolation resistor 5 is installed between two adjacent channels of the three output channels. The isolation resistor 5 is mounted on a fourth bearing portion 24 located in the metal outer cavity wall groove of the coaxial line 1 to improve the isolation performance between the output channels.

[0051] like Figure 4 As shown, the middle area of ​​the lower surface of the dielectric substrate 2 is a metal layer-free area 7 within the third coaxial line, and the surrounding area is a dielectric substrate copper-clad layer area 8 .

[0052] In this embodiment, the dielectric substrate 2 is provided with a circular through hole 6 at the cocentric position of the inner conductor of the third coaxial line 13 . The diameter of the circular through hole 6 is larger than the diameter of the inner conductor of the third coaxial line 13 .

[0053] In some embodiments, the dielectric substrate 2 is made of Rogers 5880 with a thickness of 0.508 mm.

[0054] In a specific embodiment, a hybrid three-power-division filter is provided, and the circuit structure of the three-power-division filter is as follows: Figure 1-Figure 4 shown.

[0055] An input signal with a center frequency of 15.2 GHz is fed into the input end of the coaxial line 1, wherein the outer diameter of the inner conductor and the inner diameter of the outer conductor of the first coaxial line 11 are 1 and 2.3 mm respectively, the outer diameter of the inner conductor and the inner diameter of the outer conductor of the second coaxial line 12 are 1 and 12 mm respectively, and the outer diameter of the inner conductor and the inner diameter of the outer conductor of the third coaxial line 13 are 3.78 and 12 mm respectively; a dielectric substrate 2 is placed on the cross section of the third coaxial line 13 and the E surface of the three output rectangular waveguides 4, and the distance between the dielectric substrate 2 and the short-circuit surface of the coaxial line 1 is 3.092 mm. The substrate 2 is located inside the third coaxial line 13, and three coaxial probes 31 with the same width of 1.4 mm and the same length of 3.85 mm are arranged radially. The rear ends of the three coaxial probes 31 are cascaded with an impedance transformation 32, a microstrip bandpass filter 33, and a circuit for realizing microstrip-waveguide transition conversion 34 by means of a rectangular ring-shaped magnetic excitation coupling structure. The metal strip width of the rectangular ring circuit 34 is 0.5 mm, and the outer wide side and the outer narrow side lengths of the ring are 5.34 mm and 4.6 mm respectively, so that the rectangular waveguide 4 is finally used as the output port.

[0056] Figure 5 It is the curve of input return and insertion loss of the three-passband power splitter filter of this embodiment. It can be seen from the figure that within the passband frequency range of 14.5-15.9GHz of the bandpass filter, the average insertion loss is 5.4dB, and the maximum insertion loss is 5.6dB; the input return loss is greater than 15.9dB; in the frequency band below 13.2 GHz and above 16.7 GHz, the insertion loss of each output channel is greater than 20dB. It can be seen that the three-way microwave power splitter filter has good input impedance matching and good transmission characteristics.

[0057] Figure 6 is the output echo curve of the three-way microwave power splitter filter of this embodiment. It can be seen from the figure that within the passband frequency range of 14.5-15.9 GHz of the bandpass filter, the output echo loss is greater than 9.3 dB. It can be seen that the three-way microwave power splitter filter has good output impedance matching.

[0058] Figure 7 is a curve of isolation between the output ports of the three-way microwave power splitter filter of this embodiment. It can be seen from the figure that within the passband frequency range of 14.5-15.9 GHz of the bandpass filter, the isolation between the output ports is greater than 21 dB. It can be seen that the three-way microwave power splitter filter has high isolation characteristics.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hybrid three-power-division filter, characterized in that: include: A coaxial line (1), used for transmitting an input signal along a first direction; Three output rectangular waveguides (4) are provided, the three output rectangular waveguides (4) are arranged at equal angles along the radial direction of the coaxial line (1), the output signal transmission direction of the output rectangular waveguides (4) is arranged along a second direction, and the first direction is arranged perpendicular to the second direction; A dielectric substrate (2), comprising a first bearing portion (21), three second bearing portions (22), three third bearing portions (23) and a fourth bearing portion (24); the first bearing portion (21) is circular, mounted on the cross section of the coaxial line (1) and arranged cocentrically with the coaxial line (1); the three second bearing portions (22) are distributed at equal angles along the radial direction of the coaxial line (1) and mounted on the E-plane of the output rectangular waveguide (4); the three third bearing portions (23) are mounted on the metal outer cavity wall of the coaxial line (1), and the two ends of the third bearing portions (23) are respectively connected to the first bearing portion (21) and the second bearing portions (22); the fourth bearing portion (24) is a circular ring structure, mounted in a groove of the metal outer cavity wall of the coaxial line (1) and connected to the third bearing portion (23); the fourth bearing portion (24) is arranged cocentrically with the coaxial line (1); Functional circuits (3), the number of the functional circuits (3) being the same as the number of the second bearing parts (22) and the positions corresponding to each other, the functional circuits (3) being arranged on the upper surface of the dielectric substrate (2), and a coaxial probe (31) being arranged at one end of each functional circuit (3), the coaxial probe (31) extending into the coaxial line (1) along the radial direction of the coaxial line (1), and the other end of the functional circuit (3) extending into the output rectangular waveguide (4) after passing through the outer cavity wall of the coaxial line (1); The functional circuit (3) further comprises an impedance conversion circuit (32), a microstrip bandpass filter (33) and a microstrip-to-waveguide transition conversion circuit (34); one end of the impedance conversion circuit (32) is connected to the coaxial probe (31), the other end of the impedance conversion circuit (32) is connected to the microstrip bandpass filter (33), and the other end of the microstrip bandpass filter (33) is connected to the microstrip-to-waveguide transition conversion circuit (34); The microstrip-waveguide transition conversion circuit (34) adopts a magnetic excitation coupling method of an annular metal strip structure to realize the transition conversion between the microstrip line and the rectangular waveguide; the annular metal strip structure is a rectangular annular circuit, and the rectangular annular circuit is provided with a disconnection portion (35) on a side adjacent to the microstrip bandpass filter (33) and on a straight line segment constituting the rectangular annular circuit, so that the rectangular annular circuit has two connection portions, and the microstrip bandpass filter (33) is connected to one of the connection portions.

2. The hybrid three-power-division filter according to claim 1, characterized in that: The coaxial line (1) comprises a first coaxial line (11), a second coaxial line (12) and a third coaxial line (13) which are coaxially connected; the inner conductor diameters of the first coaxial line (11) and the second coaxial line (12) are the same, and the inner conductor diameter of the second coaxial line (12) is smaller than the inner conductor diameter of the third coaxial line (13); the inner diameter of the outer conductor of the first coaxial line (11) is smaller than the inner diameter of the outer conductor of the second coaxial line (12), and the outer conductor inner diameters of the second coaxial line (12) and the third coaxial line (13) are the same; and the first bearing portion (21) is mounted on a cross section of the third coaxial line (13).

3. The hybrid three-power-division filter according to claim 1, characterized in that: The second bearing portion (22) is located at the center of the wide side of the output rectangular waveguide (4).

4. The hybrid three-power-division filter according to claim 1, characterized in that: The other connecting portion is connected to a grounding wire (36), the grounding wire (36) extending from the wide side of the output rectangular waveguide (4) and grounded through the metal outer cavity wall of the output rectangular waveguide (4).

5. The hybrid three-power-division filter according to claim 1, characterized in that: An isolation resistor (5) is provided between output channels of each two adjacent output rectangular waveguides (4), and the isolation resistor (5) is mounted on the fourth bearing portion (24).

6. The hybrid three-power-division filter according to claim 2, characterized in that: The dielectric substrate (2) is provided with a circular through hole (6) at a position cocentric with the inner conductor of the third coaxial line (13); the diameter of the circular through hole (6) is greater than the diameter of the inner conductor of the third coaxial line (13).

7. The hybrid three-power-division filter according to claim 2, characterized in that: The third coaxial line (13) terminal is short-circuited.

8. The hybrid three-power-division filter according to claim 2, characterized in that: The inner conductor diameter and the inner diameter of the outer conductor of the first coaxial line (11) are set according to the dimensions capable of transmitting the TEM main mode at the operating frequency and having a characteristic impedance of 50 ohms.

9. The hybrid three-power-division filter according to claim 1, characterized in that: The dielectric substrate (2) is made of Rogers 5880 and has a thickness of 0.508 mm.

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