A six-port equal power splitting coupling network based on DGS rectangular microcoaxial cable

Abstract

This invention discloses a six-port equal-power-dividing coupling network based on a DGS rectangular microcoaxial cable, comprising a microcoaxial outer conductor, a defective ground coupling line, an inner conductor transmission line, output ports, a serpentine inner conductor coupling line, and a defective ground crossover. This invention achieves four-port output with equal output amplitudes based on a traditional branch-line directional coupler. When the two input ports are excited separately, the four output ports have phase differences of +90° and -90° respectively, realizing left-hand and right-hand circular polarization of a four-element antenna array. By integrating defective ground technology on the microcoaxial outer conductor, the coupling degrees of freedom of the microcoaxial inner conductor are increased, improving the coupling strength of adjacent inner conductors at specific locations while meeting the requirements of microcoaxial microfabrication technology. This six-port feeding network exhibits low insertion loss and stable amplitude and phase characteristics over a wide bandwidth, making it particularly suitable for broadband circularly polarized wireless terminals with switchable high-frequency polarization in microwave and millimeter-wave applications.

Description

Technical Field

[0001] This invention relates to a miniaturized coupler network with four output ports of equal amplitude and fixed phase difference, particularly a six-port equal power splitting coupler network based on DGS rectangular microcoaxial, belonging to the field of radio frequency and microwave technology, and is especially suitable for circularly polarized antenna terminal systems in the broadband frequency range. Background Technology

[0002] Sequential rotation feed networks are a key technology widely used in circularly polarized antenna arrays. The core principle is to achieve array-level circular polarization synthesis and performance enhancement by applying a 90° phase advance to adjacent radiating elements and synchronously rotating the element polarization direction. However, current feed networks applied using the sequential rotation method suffer from the following three main problems:

[0003] The phase characteristics of traditional sequential rotation networks are achieved by transmission lines with varying electrical lengths. As their phase characteristics change with frequency, the phase progression relationship of sequential rotation fails over a wide bandwidth, deteriorating the axial ratio performance of the antenna terminals and limiting the actual usable bandwidth.

[0004] Most sequential rotating feed networks are based on microstrip lines on dielectric substrates. However, they suffer from high losses at high frequencies, and the inherent size characteristics of substrate-type transmission lines prevent the entire network from being further miniaturized.

[0005] Traditional sequential rotating networks have low isolation between output ports (typically <15dB), and crosstalk between units affects polarization purity, thus making it impossible to achieve both miniaturization and high port isolation.

[0006] Therefore, in response to the current demand for more integrated and higher-performance antenna terminals, there is an urgent need for a feeding network method that takes into account miniaturization, broadband, and high isolation. Summary of the Invention

[0007] This invention provides a six-port equal power splitting coupling network based on a DGS rectangular microcoaxial cable. The overall structure adopts a microcoaxial inner and outer structure. Through the coupling and connection transformation design of the inner conductor with open or short circuit at the terminal, a four-port output is achieved on the basis of a traditional branch-line directional coupler, and the output amplitude is the same. When the two input ports are excited respectively, the four output ports have a phase difference of +90° and -90° respectively, which can effectively realize the left-hand circular polarization and right-hand circular polarization of the four-element antenna array.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A six-port power-sharing coupling network based on a DGS rectangular microcoaxial cable includes a microcoaxial outer conductor, a defective ground coupling line, an inner conductor transmission line, an output port, an input port, a serpentine inner conductor coupling line, and a defective ground crossover. A rectangular cavity is formed inside the microcoaxial outer conductor along its transmission direction, and the rectangular cavity is filled with a dielectric material.

[0010] The inner conductor transmission line and the serpentine inner conductor coupling line are respectively installed between the rectangular cavity and the outer wall of the outer conductor. The inner conductor transmission line includes a first inner conductor transmission line, a second inner conductor transmission line, and a third inner conductor transmission line. The first inner conductor transmission line and the second inner conductor transmission line are connected through a defective ground crossover. The second inner conductor transmission line and the third inner conductor transmission line are respectively connected to the micro-coaxial outer conductor through the serpentine inner conductor coupling line and a grounding post installed on the serpentine inner conductor coupling line. By changing the termination conditions of the serpentine inner conductor coupling line, the output phase of the serpentine inner conductor coupling line is made to differ from the output phase of the defective ground crossover by 180°.

[0011] The six ports include a first input port, a second input port, a first output port, a second output port, a third output port, and a fourth output port. The first input port and the second input port are respectively connected to the second inner conductor transmission line. The first output port and the second output port are connected to the first inner conductor transmission line through a defective ground coupling line. The first output port, the second output port, the third output port, and the fourth output port are respectively connected to the first inner conductor transmission line and the third inner conductor transmission line through defective ground coupling lines.

[0012] The defective ground coupling line has a first defective ground structure on both sides. The first defective ground structure is located at the center of the defective ground coupling line. The micro-coaxial outer conductor is etched into a dumbbell shape. The first defective ground structure makes the first output port and the second output port have equal power distribution and a phase difference of 90°, and the third output port and the fourth output port have equal power distribution and a phase difference of 90°.

[0013] The defective ground crossover is installed inside the micro-coaxial outer conductor. A second defective ground structure is provided on both sides of the defective ground crossover. The second defective ground structure is located at the center of the micro-coaxial defective ground crossover and etches the micro-coaxial outer conductor into a T-shape.

[0014] As a preferred technical solution of the present invention: the outer wall and both ends of the micro coaxial outer conductor are respectively provided with a first through hole, a second through hole and a third through hole, the first input port and the second input port are located in the first through hole, the first output port and the second output port are located in the second through hole, and the third output port and the fourth output port are located in the third through hole.

[0015] As a preferred embodiment of the present invention: the defective ground coupling line includes a first micro-coaxial inner conductor, a first ground-deficient inner conductor, a second ground-deficient inner conductor, a first connecting post, and a second connecting post. The first ground-deficient inner conductor and the second ground-deficient inner conductor are respectively connected to two different first micro-coaxial inner conductors. The first connecting post and the second connecting post are respectively fixed to the two first micro-coaxial inner conductors and connected to each other. The first micro-coaxial inner conductor is symmetrical about the center of the second connecting post, and the first connecting post is symmetrical about the center of the second connecting post. The first connecting post is perpendicularly connected to the first micro-coaxial inner conductor and the second connecting post to form a bridging structure.

[0016] As a preferred embodiment of the present invention: the first ground-deficient inner conductor is connected to the first inner conductor transmission line and the third inner conductor transmission line respectively, and the second ground-deficient inner conductor is connected to the first output port, the second output port, the third output port and the fourth output port respectively.

[0017] As a preferred technical solution of the present invention: the serpentine inner conductor coupling line includes a first serpentine coupling line, a second serpentine coupling line, and grounding posts respectively installed on the first serpentine coupling line and the second serpentine coupling line. One end of the first serpentine coupling line is connected to the second inner conductor transmission line, and the other end is connected to the micro coaxial outer conductor through the grounding post. One end of the second serpentine coupling line is connected to the third inner conductor transmission line, and the other end is connected to the micro coaxial outer conductor through the grounding post.

[0018] As a preferred technical solution of the present invention: the micro-coaxial defect cross-connector includes a second micro-coaxial inner conductor, a third micro-coaxial inner conductor, and an inner conductor connector. The two ends of the second micro-coaxial inner conductor and the third micro-coaxial inner conductor are respectively connected to the inner conductor connector. The second micro-coaxial inner conductor and the third micro-coaxial inner conductor have a centrally symmetrical structure.

[0019] As a preferred embodiment of the present invention: a fourth microcoaxial inner conductor, a third connecting post, and a fourth connecting post are respectively provided on the second microcoaxial inner conductor and the third microcoaxial inner conductor. The fourth microcoaxial inner conductor is symmetrical about the center of the fourth connecting post, and the third connecting post is symmetrical about the center of the fourth connecting post. The third connecting post is perpendicularly connected to the fourth microcoaxial inner conductor and the fourth connecting post to form a bridging structure.

[0020] As a preferred technical solution of the present invention: the micro coaxial outer conductor has a five-layer structure, and the height of each layer is uniformly 0.1mm.

[0021] As a preferred embodiment of the present invention, the medium filling the rectangular cavity is air.

[0022] As a preferred embodiment of the present invention, the micro-coaxial outer conductor, defective ground coupling line, defective ground crossover, inner conductor transmission line, serpentine inner conductor coupling line, input port, and output port are all made of conductive metal materials.

[0023] 1. Coupling degree adjustment of microcoaxial inner conductor coupling lines based on microcoaxial outer conductor DGS technology:

[0024] This invention constructs a micro-coaxial DGS structure by cutting notches on the micro-coaxial outer conductor. Based on the inherent coupling degree adjustment of the serpentine inner conductor coupling line, it introduces additional coupling strength control methods, further improving the degree of freedom in adjusting the coupling strength of the inner conductor under the constraints of limited size and micro-machining technology.

[0025] 2. Design of a six-port feeder network based on directional coupler topology extension:

[0026] Based on the traditional four-port directional coupler, this invention achieves a six-port feed network topology construction without significantly increasing the overall size by connecting coupling lines with different terminal states and expanding the topology. It also achieves a stable output amplitude that can be used for left-hand circularly polarized and right-hand circularly polarized antenna arrays within a limited size.

[0027] 3. Phase modulation of inner conductor coupling lines based on different terminal states:

[0028] This invention achieves the required 90° or 180° phase output at a specific location by combining micro-coaxial inner conductor coupling lines with different terminal states, thereby enabling the entire power supply network to have a stable +90° phase difference and -90° phase difference over the broadband range of four output ports.

[0029] 4. Position transformation and connection matching of inner conductor coupling lines in micro-coaxial cables:

[0030] This invention sets output ports at specific locations in the network and ensures that each output port has a sequentially increasing or decreasing phase difference. It requires the design of a cross-connect with interchangeable inner conductor coupling lines under a five-layer micro-coaxial process and the implementation of impedance matching characteristics of the cross-connect.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. Stable amplitude and phase output performance over a wide bandwidth:

[0033] The proposed six-port equal power splitting coupling network based on DGS rectangular micro-coaxial cable achieves equal power splitting output in the 19GHz-25GHz broadband range, with an insertion loss greater than 12dB, achieving good matching; the isolation of the isolation port is greater than 19dB, achieving good isolation; when switching input ports, the phase difference between adjacent ports is 90° and -90° respectively, and the phase difference fluctuation is less than 2°.

[0034] 2. Switchable polarization direction:

[0035] This invention can excite array antennas with left-hand circular polarization and right-hand circular polarization respectively under the separate excitation of two input ports, and the polarization switchable feature can adapt to scenarios with different bandwidth requirements.

[0036] 3. Miniaturized design:

[0037] By utilizing the sub-millimeter structure of the micro coaxial cable, the overall feed network size becomes extremely small; and through the combination design of open-circuit and short-circuit coupling lines, the overall size of the six-port feed network is further reduced, making it very suitable for use in space-constrained environments and meeting the requirements of high integration. Attached Figure Description

[0038] Figure 1 This is a top perspective view of the overall structure of the present invention.

[0039] Figure 2 This is a side perspective view of the overall structure of the present invention.

[0040] Figure 3 This is a perspective view of the defective coupling line in this invention.

[0041] Figure 4 This is a top view of the defective coupling line in this invention.

[0042] Figure 5 This is a side view of the defective coupling line in this invention.

[0043] Figure 6 This is a perspective view of the defective crossbar in this invention.

[0044] Figure 7 This is a top view of the defective crossbar in this invention.

[0045] Figure 8 This is a side view of the defective crossbar in this invention.

[0046] Figure 9 This is the output amplitude curve when the first input port is excited in this invention.

[0047] Figure 10 This is the output phase curve diagram when the first input port is excited in this invention.

[0048] Figure 11 This is the output amplitude curve when the second input port is excited in this invention.

[0049] Figure 12 This is the output phase curve diagram when the second input port is excited in this invention.

[0050] List of reference numerals in the attached diagram:

[0051] 100. Microcoaxial outer conductor; 200. Defective ground coupling line; 210. First defective ground inner conductor; 211. First microcoaxial inner conductor; 212. First connecting post; 213. Second connecting post; 220. Second defective ground inner conductor; 230. First defective ground structure; 310. First inner conductor transmission line; 320. Second inner conductor transmission line; 330. Third inner conductor transmission line; 410. First input port; 420. Second input port; 430. First output port; 440. Second output port; 450, Third output port; 460, Fourth output port; 510, Serpentine inner conductor coupling line; 511, First serpentine coupling line; 512, Second serpentine coupling line; 520, Grounding post; 600, Defective ground crossover; 610, Second micro-coaxial inner conductor; 611, Fourth micro-coaxial inner conductor; 612, Third connecting post; 613, Fourth connecting post; 620, Third micro-coaxial inner conductor; 630, Second defective ground structure; 640, Inner conductor connector. Detailed Implementation

[0052] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0053] like Figure 1-2 As shown, this invention proposes a six-port power distribution coupling network based on a DGS rectangular microcoaxial cable, including a microcoaxial outer conductor 100, a defective ground coupling line 200, an inner conductor transmission line, an output port, a serpentine inner conductor coupling line 510, and a defective ground crossover 600. A rectangular cavity is formed inside the microcoaxial outer conductor 100 along its transmission direction, and the rectangular cavity is filled with a dielectric material.

[0054] The inner conductor transmission line and the serpentine inner conductor coupling line 510 are respectively installed between the rectangular cavity and the outer wall of the outer conductor. The inner conductor transmission line includes a first inner conductor transmission line 310, a second inner conductor transmission line 320, and a third inner conductor transmission line 330. The first inner conductor transmission line 310 and the second inner conductor transmission line 320 are connected by a defective ground crossover 600. The second inner conductor transmission line 320 and the third inner conductor transmission line 330 are respectively connected to the micro-coaxial outer conductor 100 through the serpentine inner conductor coupling line 510 and the grounding post 520 installed on it. By changing the termination conditions of the serpentine inner conductor coupling line 510, its output phase is made 180° out of phase with the output phase of the defective ground crossover 600.

[0055] The output ports include a first input port 410, a second input port 420, a first output port 430, a second output port 440, a third output port 450, and a fourth output port 460. The first input port 410 and the second input port 420 are respectively connected to the second inner conductor transmission line 320. The first output port 430 and the second output port 440 are connected to the first inner conductor transmission line 310 through a defective ground coupling line 200. The first output port 430, the second output port 440, the third output port 450, and the fourth output port 460 are respectively connected to the first inner conductor transmission line 310 and the third inner conductor transmission line 330 through the defective ground coupling line 200.

[0056] The defective ground coupling line 200 has a first defective ground structure 230 on both sides. The first defective ground structure 230 is located at the center of the defective ground coupling line 200 and etches the micro-coaxial outer conductor 100 into a dumbbell shape. Through the first defective ground structure 230, the first output port 430 and the second output port 440 are equally power-divided with a phase difference of 90°, and the third output port 450 and the fourth output port 460 are equally power-divided with a phase difference of 90°.

[0057] The defective ground crossover 600 is installed inside the micro-coaxial outer conductor 100, and second defective ground structures 630 are provided on both sides of it. The second defective ground structures 630 are located at the center of the micro-coaxial defective ground crossover 600 and etch the micro-coaxial outer conductor 100 into a T-shape.

[0058] This invention employs a micro-coaxial inner and outer structure. Through the coupling and connection transformation design of the inner conductor with open or short circuits at the terminals, it achieves four-port output with identical output amplitudes based on a traditional branch-line directional coupler. When the two input ports are excited separately, the four output ports have phase differences of +90° and -90° respectively, effectively realizing left-hand and right-hand circular polarization of a four-element antenna array. Furthermore, by integrating defective ground plane technology on the outer conductor 100 of the micro-coaxial structure, the coupling degrees of freedom of the inner conductor are increased, improving the coupling strength of adjacent inner conductors at specific locations while meeting the requirements of micro-coaxial microfabrication technology. This six-port feed network exhibits low insertion loss and stable amplitude and phase characteristics over a wide bandwidth, making it particularly suitable for broadband circularly polarized wireless terminals with switchable high-frequency polarization in microwave and millimeter-wave applications.

[0059] The outer wall and two ends of the micro coaxial outer conductor 100 are respectively provided with a first through hole, a second through hole and a third through hole. The first input port 410 and the second input port 420 are located in the first through hole, the first output port 430 and the second output port 440 are located in the second through hole, and the third output port 450 and the fourth output port 460 are located in the second through hole.

[0060] In this invention, a first through hole is provided on the outer wall of the micro coaxial outer conductor 100, and a second through hole is provided at each of the two ends. The first through hole is used to place the first input port 410 and the second input port 420, and the second through holes at both ends are used to place the first output port 430, the second output port 440, the third output port 450 and the fourth output port 460, respectively.

[0061] Among them, such as Figure 3-5 As shown, the defective ground coupling line 200 includes a first micro-coaxial inner conductor 211, a first ground-deficient inner conductor 210, a second ground-deficient inner conductor 220, a first connecting post 212, and a second connecting post 213. The first ground-deficient inner conductor 210 and the second ground-deficient inner conductor 220 are respectively connected to two different first micro-coaxial inner conductors 211. The first connecting post 212 and the second connecting post 213 are respectively fixed to the two first micro-coaxial inner conductors 211 and connected to each other. The first micro-coaxial inner conductor 211 is centrally symmetrical about the second connecting post 213, and the first connecting post 212 is centrally symmetrical about the second connecting post 213. The first connecting post 212 is perpendicularly connected to the first micro-coaxial inner conductor 211 and the second connecting post 213, forming a bridging structure.

[0062] The first ground-deficient inner conductor 210 is connected to the first inner conductor transmission line 310 and the third inner conductor transmission line 330, respectively, and the second ground-deficient inner conductor 220 is connected to the first output port 430, the second output port 440, the third output port 450 and the fourth output port 460, respectively.

[0063] The serpentine inner conductor coupling line 510 includes a first serpentine coupling line 511, a second serpentine coupling line 512, and grounding posts 520 respectively installed on the first serpentine coupling line 511 and the second serpentine coupling line 512. One end of the first serpentine coupling line 511 is connected to the second inner conductor transmission line 320, and the other end is connected to the micro coaxial outer conductor 100 through the grounding post 520. One end of the second serpentine coupling line 512 is connected to the third inner conductor transmission line 330, and the other end is connected to the micro coaxial outer conductor 100 through the grounding post 520.

[0064] Among them, such as Figure 6-8 As shown, the micro-coaxial defect ground crossover 600 includes a second micro-coaxial inner conductor 610, a third micro-coaxial inner conductor 620, a second defect ground structure 630, and an inner conductor connector 640. The two ends of the second micro-coaxial inner conductor 610 and the third micro-coaxial inner conductor 620 are respectively connected to the inner conductor connector 640. The second micro-coaxial inner conductor 610 and the third micro-coaxial inner conductor 620 are centrally symmetrical structures.

[0065] The second micro-coaxial inner conductor 610 and the third micro-coaxial inner conductor 620 are respectively provided with a fourth micro-coaxial inner conductor 611, a third connecting post 612 and a fourth connecting post 613. The fourth micro-coaxial inner conductor 611 is symmetrical about the fourth connecting post 613, and the third connecting post 612 is symmetrical about the fourth connecting post 613. The third connecting post 612 is perpendicularly connected to the fourth micro-coaxial inner conductor 611 and the fourth connecting post 613 to form a bridging structure.

[0066] The micro-coaxial outer conductor 100 has a five-layer structure, with each layer having a uniform height of 0.1 mm.

[0067] The medium filling the rectangular cavity is preferably air, but other low-loss medium materials can also be used.

[0068] The micro-coaxial outer conductor 100, defective ground coupling line 200, defective ground crossover 600, inner conductor transmission line, serpentine inner conductor coupling line 510, input port, and output port are all made of conductive metal materials. In this embodiment of the invention, copper is used.

[0069] like Figure 9-12As shown, the present invention proposes a six-port equal power splitting coupling network based on DGS rectangular micro coaxial cable, which realizes equal power splitting output of the output port in the 19GHz-25GHz broadband range, with an insertion loss greater than 12dB and good matching; the isolation of the isolation port is greater than 19dB, achieving good isolation; when switching the input port, the phase difference between adjacent ports is 90° and -90° respectively, and the phase difference fluctuation is less than 2°.

[0070] In this embodiment of the invention, for example, the length, width, and gap width of the first ground-deficient inner conductor 210 and the second ground-deficient inner conductor 220 are set to 3mm, 0.05mm, and 0.02mm, respectively; the length, width, and height of the first connecting post 212 are set to 0.06mm, 0.05mm, and 0.1mm, respectively; and the length, width, and height of the second connecting post 213 are set to 0.14mm, 0.12mm, and 0.1mm, respectively.

[0071] In this embodiment of the invention, for example, the length, width, and gap width of the second micro-coaxial inner conductor 610 and the third micro-coaxial inner conductor 620 are set to 3mm, 0.06mm, and 0.02mm, respectively; the length, width, and height of the third connecting post 612 are set to 0.06mm, 0.06mm, and 0.1mm, respectively; and the length, width, and height of the fourth connecting post 613 are set to 0.14mm, 0.14mm, and 0.1mm, respectively.

[0072] In this embodiment of the invention, for example, the length and width of the first inner conductor transmission line 310 are set to 0.84 mm and 0.2 mm, the length and width of the second inner conductor transmission line 320 are set to 0.52 mm and 0.2 mm, and the length and width of the third inner conductor transmission line 330 are set to 1 mm and 0.2 mm.

[0073] In this embodiment of the invention, for example, the length and width of the first coupling line and the second coupling line of the serpentine micro-conductor coupling line are set to 3.6 mm and 0.06 mm, respectively, and the spacing between the first coupling line and the second coupling line is 0.02 mm.

[0074] In this embodiment of the invention, for example, the length and width of the upper and lower portions of the first defect structure 230 are set to 0.9 mm and 0.4 mm, respectively, and the length and width of the middle connecting portion are set to 0.73 mm and 0.28 mm, respectively.

[0075] In this embodiment of the invention, for example, the upper part of the second defect structure 630 has a length and width of 0.9 mm and 0.4 mm, and the lower part has a length and width of 0.73 mm and 0.28 mm.

[0076] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any modifications or equivalent changes made based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. A six-port power splitting coupling network based on a DGS rectangular microcoaxial cable, characterized in that: The device includes a microcoaxial outer conductor (100), a defective ground coupling line (200), an inner conductor transmission line, an output port, an input port, a serpentine inner conductor coupling line (510), and a defective ground crossover (600). A rectangular cavity is formed inside the microcoaxial outer conductor (100) along its transmission direction, and the rectangular cavity is filled with a dielectric material. The inner conductor transmission line and the serpentine inner conductor coupling line (510) are respectively installed between the rectangular cavity and the outer wall of the outer conductor. The inner conductor transmission line includes a first inner conductor transmission line (310), a second inner conductor transmission line (320), and a third inner conductor transmission line (330). The first inner conductor transmission line (310) and the second inner conductor transmission line (320) are connected through a defective ground crossover (600). The second inner conductor transmission line (320) and the third inner conductor transmission line (330) are respectively connected to the micro-coaxial outer conductor (100) through the serpentine inner conductor coupling line (510) and a grounding post (520) installed on the serpentine inner conductor coupling line (510). By changing the terminal conditions of the serpentine inner conductor coupling line (510), the output phase of the serpentine inner conductor coupling line (510) is 180° out of phase with the output phase of the defective ground crossover (600). The six ports include a first input port (410), a second input port (420), a first output port (430), a second output port (440), a third output port (450), and a fourth output port (460). The first input port (410) and the second input port (420) are respectively connected to the second inner conductor transmission line (320). The first output port (430) and the second output port (440) are connected to the first inner conductor transmission line (310) through a defective ground coupling line (200). The first output port (430), the second output port (440), the third output port (450), and the fourth output port (460) are respectively connected to the first inner conductor transmission line (310) and the third inner conductor transmission line (330) through a defective ground coupling line (200). The defective ground coupling line (200) has a first defective ground structure (230) on both sides. The first defective ground structure (230) is located at the center of the defective ground coupling line (200) and etches the micro coaxial outer conductor (100) into a dumbbell shape. The first defective ground structure (230) makes the first output port (430) and the second output port (440) have equal power division and a phase difference of 90°, and the third output port (450) and the fourth output port (460) have equal power division and a phase difference of 90°. The defective ground crossover (600) is installed inside the micro-coaxial outer conductor (100). A second defective ground structure (630) is provided on both sides of the defective ground crossover (600). The second defective ground structure (630) is located at the center of the micro-coaxial defective ground crossover (600) and etches the micro-coaxial outer conductor (100) into a T-shape.

2. The six-port equal power splitting coupling network based on DGS rectangular microcoaxial cable according to claim 1, characterized in that: The outer wall and both ends of the micro coaxial outer conductor (100) are respectively provided with a first through hole, a second through hole and a third through hole. The first input port (410) and the second input port (420) are located in the first through hole, the first output port (430) and the second output port (440) are located in the second through hole, and the third output port (450) and the fourth output port (460) are located in the third through hole.

3. The six-port equal-power-sharing coupling network based on DGS rectangular microcoaxial cable according to claim 1, characterized in that: The defective ground coupling line (200) includes a first micro-coaxial inner conductor (211), a first ground-deficient inner conductor (210), a second ground-deficient inner conductor (220), a first connecting post (212), and a second connecting post (213). The first ground-deficient inner conductor (210) and the second ground-deficient inner conductor (220) are respectively connected to two different first micro-coaxial inner conductors (211). The first connecting post (212) and the second connecting post (213) are respectively fixed on the two first micro-coaxial inner conductors (211) and connected to each other. The first micro-coaxial inner conductor (211) is centrally symmetrical about the second connecting post (213), and the first connecting post (212) is centrally symmetrical about the second connecting post (213). The first connecting post (212) is perpendicularly connected to the first micro-coaxial inner conductor (211) and the second connecting post (213) to form a bridging structure.

4. A six-port equal-power-sharing coupling network based on a DGS rectangular microcoaxial cable according to claim 3, characterized in that: The first ground-deficient inner conductor (210) is connected to the first inner conductor transmission line (310) and the third inner conductor transmission line (330) respectively, and the second ground-deficient inner conductor (220) is connected to the first output port (430), the second output port (440), the third output port (450) and the fourth output port (460) respectively.

5. A six-port equal-power-sharing coupling network based on a DGS rectangular micro-coaxial cable according to claim 1, characterized in that: The serpentine inner conductor coupling line (510) includes a first serpentine coupling line (511), a second serpentine coupling line (512), and grounding posts (520) respectively installed on the first serpentine coupling line (511) and the second serpentine coupling line (512). One end of the first serpentine coupling line (511) is connected to the second inner conductor transmission line (320), and the other end is connected to the micro coaxial outer conductor (100) through the grounding post (520). One end of the second serpentine coupling line (512) is connected to the third inner conductor transmission line (330), and the other end is connected to the micro coaxial outer conductor (100) through the grounding post (520).

6. A six-port equal-power-sharing coupling network based on a DGS rectangular micro-coaxial cable according to claim 1, characterized in that: The micro-coaxial defect crossbar (600) includes a second micro-coaxial inner conductor (610), a third micro-coaxial inner conductor (620), and an inner conductor connector (640). The two ends of the second micro-coaxial inner conductor (610) and the third micro-coaxial inner conductor (620) are respectively connected to the inner conductor connector (640). The second micro-coaxial inner conductor (610) and the third micro-coaxial inner conductor (620) have a centrally symmetrical structure.

7. A six-port equal-power-sharing coupling network based on a DGS rectangular microcoaxial cable according to claim 6, characterized in that: The second micro-coaxial inner conductor (610) and the third micro-coaxial inner conductor (620) are respectively provided with a fourth micro-coaxial inner conductor (611), a third connecting post (612) and a fourth connecting post (613). The fourth micro-coaxial inner conductor (611) is symmetrical about the fourth connecting post (613), and the third connecting post (612) is symmetrical about the fourth connecting post (613). The third connecting post (612) is perpendicularly connected to the fourth micro-coaxial inner conductor (611) and the fourth connecting post (613) to form a bridging structure.

8. A six-port equal-power-sharing coupling network based on a DGS rectangular micro-coaxial cable according to claim 1, characterized in that: The micro-coaxial outer conductor (100) has a five-layer structure, with each layer having a uniform height of 0.1 mm.

9. A six-port equal-power-sharing coupling network based on a DGS rectangular micro-coaxial cable according to claim 1, characterized in that: The rectangular cavity is filled with air.

10. A six-port equal-power-sharing coupling network based on a DGS rectangular micro-coaxial cable according to claim 1, characterized in that: The micro-coaxial outer conductor (100), defective ground coupling line (200), defective ground crossover (600), inner conductor transmission line, serpentine inner conductor coupling line (510), input port, and output port are all made of conductive metal materials.

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