Double-ridge waveguide magic T

Abstract

The utility model discloses a double-ridge waveguide magic T, and relates to the technical field of microwaves. The double-ridge waveguide magic T comprises an upper waveguide section which is vertically arranged, a lower end waveguide port of the upper waveguide section is connected with an upper end waveguide port of a lower waveguide section, a lower end waveguide port of the lower waveguide section is connected with an upper waveguide port of an upper cavity, a lower cavity is fixedly connected below the upper cavity, and a lower end waveguide port of the lower cavity is connected with an upper waveguide port of a lower cavity. When the upper cavity and the lower cavity are fixedly connected, a cavity structure with a T-shaped cavity inside is formed, and the upper waveguide section is communicated with the T-shaped cavity of the cavity structure through the lower waveguide section. The upper waveguide section and the lower waveguide section are connected to form an E arm of the waveguide magic T, and a forward extending part of a cavity structure formed by fixedly connecting the upper cavity and the lower cavity forms an H arm of the waveguide magic T. The waveguide magic T has the advantages of being wide in working bandwidth, good in matching effect, small in size, capable of effectively reducing high-frequency resonance and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave transmission devices, in particular to a double-ridge waveguide magic T with small volume and good matching effect. Background Art

[0002] In microwave systems, three types of connectors, ET, HT and Magic Tee, are commonly used as power distribution / synthesis components. The waveguide ET connector can output the signal input from the E port with equal amplitude and inverse phase at both ends of the balance arm. On the contrary, if the signal is input with equal amplitude and inverse phase at both ends of the balance arm, it will be synthesized and output at the E port. The waveguide HT connector can output the signal input from the H port with equal amplitude and in phase at both ends of the balance arm. On the contrary, if the signal is input with equal amplitude and in phase at both ends of the balance arm, it will be synthesized and output at the H port. The waveguide Magic Tee is a new structure combining ET and HT. Its characteristics are that there are 4 arms in total, with symmetry at both ends of the balance arm, and there are also E arms and H arms. The signal input from the E arm will be output with equal amplitude and inverse phase at both ends of the balance arm, and the H arm is isolated; the signal input from the H arm will be output with equal amplitude and in phase at both ends of the balance arm, and the E arm is isolated; the signal input from either end of the balance arm will be output equally in the E arm and the H arm, and the corresponding other end of the balance arm will be isolated. Therefore, the magic T has the characteristics of port isolation, adjacent port 3dB coupling and complete matching. Its functions are more complete than those of single ET and HT. In the microwave field, it is especially used in power synthesis / distribution, single pulse radar and difference comparator, impedance bridge, balanced duplexer, microwave discriminator, radar transceiver switch, balanced mixer, phase shifter, etc. Although the waveguide magic T has wide applicability in microwave systems, the matching effect of the waveguide magic T in the prior art is general and there are many high-frequency resonances, resulting in poor use effect. Utility Model Content

[0003] The technical problem to be solved by the utility model is how to provide a double-ridge waveguide magic T with a wide working bandwidth, good matching effect and the ability to effectively reduce high-frequency resonance.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a double-ridge waveguide magic T, including a vertically arranged upper waveguide section, the lower waveguide port of the upper waveguide section is connected to the upper waveguide port of the lower waveguide section, the lower waveguide port of the lower waveguide section is connected to the upper waveguide port of the upper cavity, the lower cavity is fixedly connected to the lower part of the upper cavity, when the upper cavity is fixedly connected to the lower cavity, a cavity structure with a T-shaped cavity inside is formed, the upper waveguide section is connected to the T-shaped cavity of the cavity structure through the lower waveguide section; the upper waveguide section and the lower waveguide are connected to form the E arm of the waveguide magic T, and the forward extending part of the cavity structure formed after the upper cavity and the lower cavity are fixedly connected constitutes the H arm of the waveguide magic T;

[0005] The upper waveguide section comprises an upper flange connection portion, a first connection cylinder portion is formed on the lower surface of the upper flange connection portion, a vertical first waveguide channel is formed inside the upper flange connection portion after being connected to the first connection cylinder portion, the upper end opening of the first waveguide channel is a first waveguide port, the lower end opening of the first waveguide channel is a second waveguide port, and a first waveguide ridge is formed on each of the two oppositely disposed wide side inner walls of the first waveguide channel;

[0006] The upper cavity comprises an upper cavity plate, a left upper half flange connection portion is formed on the left side of the upper cavity plate, a right upper half flange connection portion is formed on the right side of the upper cavity plate, a front upper half flange connection portion is formed on the front side of the upper cavity plate, a fifth waveguide port is formed at a portion of the upper surface of the upper cavity plate corresponding to the waveguide opening at the lower end of the lower waveguide section, a sixth waveguide port is formed on the lower surface of the upper cavity plate corresponding to the fifth waveguide port, a third waveguide channel is formed between the fifth waveguide port and the sixth waveguide port, and a third waveguide ridge is formed on each of the two oppositely disposed wide side inner walls of the third waveguide channel;

[0007] A T-shaped upper groove structure is formed on the lower surface of the upper cavity plate, the left side of the upper groove structure is divided into an upper left half groove by the sixth waveguide port, the right side of the upper groove structure is divided into an upper right half groove by the sixth waveguide port, and the front side of the upper groove structure is divided into an upper front half groove by the sixth waveguide port, wherein one of the third waveguide ridges extends to the right along the lower surface of the upper cavity plate, and a first stepped ridge is formed on the right side of the lower surface of the upper cavity plate, wherein another third waveguide ridge extends to the left along the lower surface of the upper cavity plate, and a second stepped ridge is formed on the left side of the lower surface of the upper cavity plate; a third stepped ridge extending outward is formed in the upper front half groove; and a horizontal E-arm matching module is formed in the third waveguide channel near the inner end of the third stepped ridge.

[0008] A further technical solution is that: the lower waveguide section includes a lower flange connection portion, the upper surface of the lower flange connection portion is provided with a mounting boss adapted to the second waveguide port, a second waveguide channel is formed in the lower waveguide section, after the second waveguide channel passes through the mounting boss and the lower flange connection portion, a third waveguide port is formed on the upper surface of the mounting boss and a fourth waveguide port is formed on the lower surface of the lower flange connection portion, the second waveguide port and the third waveguide port are arranged opposite to each other, so that the first waveguide channel is connected to the second waveguide channel, and a second waveguide ridge is formed on each of the two oppositely arranged wide side inner walls of the second waveguide channel.

[0009] A further technical solution is that: the lower cavity includes a lower cavity plate, a left lower half flange connection portion is formed on the left side of the lower cavity plate, a right lower half flange connection portion is formed on the right side of the lower cavity plate, a front lower half flange connection portion is formed on the front side of the lower cavity plate, and a plug hole is formed at a position on the upper surface of the lower cavity plate corresponding to the sixth waveguide port, and the plug hole passes through the upper and lower surfaces of the lower cavity plate;

[0010] A T-shaped lower groove structure is formed on the upper surface of the lower cavity plate, and the lower groove structure includes an X-axis groove portion extending left and right and a Y-axis groove portion extending front and back, a fourth stepped ridge extending left and right is formed in the middle of the X-axis groove portion, a fifth stepped ridge extending front and back is formed in the middle of the Y-axis groove portion, and the fifth stepped ridge is perpendicular to and in contact with the fourth stepped ridge.

[0011] A further technical solution is that: a spacer is arranged in the jack, the lower part of the spacer closes the jack, and the upper part of the spacer is inserted into the third waveguide channel on the rear side of the third waveguide ridge; a cover is formed on the lower surface of the lower cavity corresponding to the jack, and the lower end of the spacer and the jack are closed by the cover; when the upper cavity is fixedly connected to the lower cavity, the upper left half waveguide port and the lower left half waveguide port are connected to form the seventh waveguide port, the upper right half waveguide port and the lower right half waveguide port are connected to form the eighth waveguide port, and the upper front half waveguide port and the lower front half waveguide port are connected to form the ninth waveguide port; the heights of the second stepped ridge and the third stepped ridge gradually increase from the outside to the inside in a stepped shape; an upper left half waveguide port is formed on the outer side of the upper left half groove, an upper right half waveguide port is formed on the outer side of the upper right half groove, and a front half waveguide port is formed on the outer side of the upper front half groove.

[0012] The beneficial effect of adopting the above technical solution is that: the channels of the four ports (the first waveguide port, the seventh waveguide port, the eighth waveguide port and the ninth waveguide port) in the waveguide magic T described in the present application are all provided with a double ridge structure, which can effectively increase the working bandwidth of the magic T;

[0013] The channels in each port use a stepped structure for impedance matching. Compared with the diagonal transition structure, the stepped structure requires a shorter matching length, which can effectively reduce the structure size.

[0014] A step matching block structure (a second set of continuous bosses on the fourth step-shaped ridge) is added at the intersection of the four waveguides. The reflected waves generated by this structure offset the reflected waves caused by the discontinuity at the original joint, thereby achieving a better matching effect.

[0015] Adding a T-shaped metal film block in the direction parallel to the electric field of the H arm can further optimize impedance matching, eliminate high-frequency resonance, and improve port isolation. Compared with the cylindrical matching structure, the metal diaphragm can effectively reduce high-frequency resonance;

[0016] The matching optimization of the E-arm is achieved by the E-arm matching film block parallel to the electric field of the E-arm. This structure is mainly used to improve the impedance matching of the E-arm, reduce the reflected waves generated by the small discontinuous structure, and improve the port isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the waveguide magic T according to the embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the waveguide magic T according to the embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the main structure of the waveguide magic T according to the embodiment of the utility model ( Figure 1 Perspective);

[0021] Figure 4 This is a left-side structural diagram of the waveguide magic T according to an embodiment of the utility model ( Figure 1 Perspective);

[0022] Figure 5 This is a right view structural diagram of the waveguide magic T according to the embodiment of the utility model ( Figure 1 Perspective);

[0023] Figure 6 Schematic diagram of the top view of the waveguide magic T according to the embodiment of the utility model ( Figure 1 Perspective);

[0024] Figure 7 Schematic diagram of the bottom view structure of the waveguide magic T according to the embodiment of the utility model ( Figure 1 Perspective);

[0025] Figure 8 Schematic diagram of the rear view structure of the waveguide magic T according to the embodiment of the utility model ( Figure 1 Perspective);

[0026] Fig. 9 This is a schematic diagram of the exploded structure of the waveguide magic T according to an embodiment of the utility model;

[0027] Fig.10 It is a schematic cross-sectional structure diagram of the waveguide magic T according to an embodiment of the utility model;

[0028] Fig.11 It is a structural schematic diagram of the upper waveguide section in the waveguide magic T described in the embodiment of the utility model;

[0029] Fig.12 It is a schematic diagram of the structure of the lower waveguide section in the waveguide magic T described in the embodiment of the utility model;

[0030] Fig.13 It is a schematic diagram of the structure of the upper cavity of the waveguide magic T in the embodiment of the utility model;

[0031] Fig.14 It is a schematic diagram of the structure of the upper cavity of the waveguide magic T in the embodiment of the utility model;

[0032] Fig.15 It is a schematic diagram of the structure of the lower cavity of the waveguide magic T in the embodiment of the utility model;

[0033] Fig.16 It is a schematic diagram of the structure of the lower cavity of the waveguide magic T in the embodiment of the utility model;

[0034] Fig.17 It is a structural schematic diagram of the spacer in the waveguide magic T according to the embodiment of the utility model;

[0035] Wherein: 1, upper waveguide section; 1-1, upper flange connection portion; 1-2, first connection barrel portion; 1-3, first waveguide port; 1-4, second waveguide port; 1-5, first waveguide ridge;

[0036] 2. Lower waveguide section; 2-1. Lower flange connection; 2-2. Mounting boss; 2-3. Third waveguide port; 2-4. Fourth waveguide port; 2-5. Second waveguide ridge;

[0037] 3. Upper cavity; 3-1. Upper cavity plate; 3-2. Upper left half flange connection; 3-3. Upper right half flange connection; 3-4. Front upper half flange connection; 3-5. Fifth waveguide port; 3-6. Sixth waveguide port; 3-7. Third waveguide ridge; 3-8. First stepped ridge; 3-9. Second stepped ridge; 3-10. Third stepped ridge; 3-11. Upper left half waveguide port; 3-12. Upper right half waveguide port; 3-13. Upper front half waveguide port; 3-14. E-arm matching module;

[0038] 4, lower cavity; 4-1, lower cavity plate; 4-2, left lower half flange connection; 4-3, right lower half flange connection; 4-4, front lower half flange connection; 4-5, jack; 4-6, fourth stepped ridge; 4-6-1, left half fourth stepped ridge; 4-6-2, right half fourth stepped ridge; 4-7, fifth stepped ridge; 4-7-1, first group of continuous bosses; 4-7-2, second group of continuous bosses; 4-8, lower left half waveguide port; 4-9, lower right half waveguide port; 4-10, lower front half waveguide port;

[0039] 5. Spacer;

[0040] 6. Capping;

[0041] 7. Positioning pins;

[0042] 8. Tighten the screws. DETAILED DESCRIPTION

[0043] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0045] like Figure 1-Figure 10 As shown, the embodiment of the utility model discloses a double-ridge waveguide magic T, which is made of metal material and comprises an upper waveguide section 1, a lower waveguide section 2, an upper cavity 3 and a lower cavity 4. The upper waveguide section 1 and the lower waveguide section 2 are arranged vertically, the lower waveguide port of the upper waveguide section 1 is connected to the upper waveguide port of the lower waveguide section 2, the lower waveguide port of the lower waveguide section 2 is connected to the upper waveguide port of the upper cavity 3, the lower cavity 4 is fixedly connected to the lower part of the upper cavity 3, when the upper cavity 3 is fixedly connected to the lower cavity 4, a cavity structure with a T-shaped cavity inside is formed, and the upper waveguide section 1 is connected to the T-shaped cavity of the cavity structure through the lower waveguide section 2; the upper waveguide section 1 and the lower waveguide section 2 are connected to form the E arm of the waveguide magic T, and the forward extending part of the cavity structure formed after the upper cavity 3 and the lower cavity 4 are fixedly connected constitutes the H arm of the waveguide magic T.

[0046] Further, such as Fig.11 As shown, the upper waveguide section 1 includes an upper flange connection part 1-1, and a plurality of positioning holes (positioning pins 7 are arranged in the positioning holes) and mounting holes are formed around the upper flange connection part 1-1, which are used to conveniently connect the upper waveguide section 1 with other components; a first connecting cylinder part 1-2 is formed on the lower surface of the upper flange connection part 1-1, and a vertical first waveguide channel is formed inside the upper flange connection part 1-1 after being connected to the first connecting cylinder part 1-2, the upper end opening of the first waveguide channel is a first waveguide port 1-3, and the lower end opening of the first waveguide channel is a second waveguide port 1-4, and a first waveguide ridge 1-5 is formed on each of the two oppositely arranged wide side inner walls of the first waveguide channel, and the two first waveguide ridges 1-5 are arranged oppositely, and the first waveguide channel is divided into two parts connected to each other by the two first waveguide ridges 1-5.

[0047] Further, such as Fig.12 As shown, the lower waveguide section 2 includes a lower flange connection portion 2-1, and a plurality of positioning holes and mounting holes are formed around the upper flange connection portion 1-1, which are used to conveniently fix the upper waveguide section 1 with the lower cavity 3; the upper surface of the lower flange connection portion 2-1 is provided with a mounting boss 2-2 adapted to the second waveguide port 1-4, and a second waveguide channel is formed in the lower waveguide section 2, and the second waveguide channel passes through the mounting boss 2-2 and the lower flange connection portion 2-1, and is located on the upper surface of the mounting boss 2-2. A third waveguide port 2-3 is formed on the surface and a fourth waveguide port 2-4 is formed on the lower surface of the lower flange connecting portion 2-1, the second waveguide port 1-4 is arranged opposite to the third waveguide port 2-3, so that the first waveguide channel is connected to the second waveguide channel, and a second waveguide ridge 2-5 is formed on each of the two oppositely arranged wide side inner walls of the second waveguide channel, the two second waveguide ridges 2-5 are arranged opposite to each other, and the second waveguide channel is divided into two parts that are interconnected by the two second waveguide ridges 2-5.

[0048] like Figure 13-14As shown, the upper cavity 3 includes an upper cavity plate 3-1, a left upper half flange connecting portion 3-2 is formed on the left side of the upper cavity plate 3-1, a right upper half flange connecting portion 3-3 is formed on the right side of the upper cavity plate 3-1, a front upper half flange connecting portion 3-4 is formed on the front side of the upper cavity plate 3-1, a fifth waveguide port 3-5 is provided at a portion of the upper surface of the upper cavity plate 3-1 corresponding to the lower waveguide port of the lower waveguide section 2, a sixth waveguide port 3-6 is formed on the lower surface of the upper cavity plate 3-1 corresponding to the fifth waveguide port 3-5, a third waveguide channel is formed between the fifth waveguide port 3-5 and the sixth waveguide port 3-6, a third waveguide channel is formed on each of the two relatively wide side inner walls of the third waveguide channel, the two third waveguide ridges 3-7 are relatively arranged, and the third waveguide channel is divided into two parts that are interconnected by the two third waveguide ridges 3-7.

[0049] like Fig. 9 and Fig.14 As shown, a T-shaped upper groove structure is formed on the lower surface of the upper cavity plate 3-1, the left side of the upper groove structure is divided into an upper left half groove by the sixth waveguide port 3-6, the right side of the upper groove structure is divided into an upper right half groove by the sixth waveguide port 3-6, and the front side of the upper groove structure is divided into an upper front half groove by the sixth waveguide port 3-6, wherein a third waveguide ridge 3-7 extends rightward along the lower surface of the upper cavity plate 3-1, forming a third waveguide ridge 3-7 on the right side of the lower surface of the upper cavity plate 3-1. There is a first stepped ridge 3-8, another third waveguide ridge 3-7 of which extends to the left along the lower surface of the upper cavity plate, and a second stepped ridge 3-9 is formed on the left side of the lower surface of the upper cavity plate; a third stepped ridge 3-10 extending outward is formed in the upper front half groove, and a horizontal E-arm matching module 3-14 is formed in the third waveguide channel near the inner end of the third stepped ridge 3-10. The processing method of the E-arm matching module 3-14 is not fixed, and it can be a split type or an integrated type.

[0050] Further, such as Fig.14 As shown, the heights of the first stepped ridge 3-8, the second stepped ridge 3-9 and the third stepped ridge 3-10 gradually increase from the outside to the inside in a stepped manner; an upper left half waveguide port 3-11 is formed on the outer side of the upper left half groove, an upper right half waveguide port 3-12 is formed on the outer side of the upper right half groove, and an upper front half waveguide port 3-13 is formed on the outer side of the upper front half groove.

[0051] Further, such as Fig.14As shown, the upper left half groove is divided into two parts, front and rear, by the first stepped ridge 3-8, the bottom surface of the upper left half groove of the front and rear parts is a stepped bottom surface, and the height of the stepped bottom surface increases gradually from the outside to the inside in a stepped manner; the upper right half groove is divided into two parts, front and rear, by the second stepped ridge 3-9, the bottom surface of the upper right half groove of the front and rear parts is a stepped bottom surface, and the height of the stepped bottom surface increases gradually from the outside to the inside in a stepped manner; the upper front half groove is divided into two parts, left and right, by the third stepped ridge 3-10, the bottom surface of the front half groove of the left and right parts is a stepped bottom surface, and the height of the stepped bottom surface increases gradually from the outside to the inside in a stepped manner, and the sixth waveguide port 3-6 is connected to the upper left half groove, the upper right half groove and the upper front half groove.

[0052] like Figure 15-16 As shown, the lower cavity 4 includes a lower cavity plate 4-1, a left lower half flange connection portion 4-2 is formed on the left side of the lower cavity plate 4-1, a right lower half flange connection portion 4-3 is formed on the right side of the lower cavity plate, a front lower half flange connection portion 4-4 is formed on the front side of the lower cavity plate, and a jack 4-5 is formed at a position on the upper surface of the lower cavity plate 4-1 corresponding to the sixth waveguide port 3-6, and the jack 4-5 passes through the upper and lower surfaces of the lower cavity plate 4-1;

[0053] Further, such as Fig.16 As shown, a T-shaped lower groove structure is formed on the upper surface of the lower cavity plate 4-1, and the lower groove structure includes an X-axis groove portion extending left and right and a Y-axis groove portion extending front and back, a fourth step-shaped ridge 4-6 extending left and right is formed in the middle of the X-axis groove portion, a fifth step-shaped ridge 4-7 extending front and back is formed in the middle of the Y-axis groove portion, and the fifth step-shaped ridge 4-7 is perpendicular to and in contact with the fourth step-shaped ridge 4-6.

[0054] Further, such as Fig.16As shown, the fourth stepped ridge 4-6 includes a left-half fourth stepped ridge 4-6-1 and a right-half fourth stepped ridge 4-6-2 which are symmetrically arranged on the left and right sides, and the left-half fourth stepped ridge 4-6-1 and the right-half fourth stepped ridge 4-6-2 are continuous four-level stepped structures which gradually increase in height from the outside to the inside; the fifth stepped ridge 4-7 includes a first group of continuous bosses 4-7-1 close to the outside and a second group of continuous bosses 4-7-2 close to the four-step ridges, and the first group of continuous bosses 4-7-1 includes five bosses extending from the outside to the inside. The bosses gradually rise from the outside to the inside, the second group of continuous bosses 4-7-2 is located on the lower side of the E-arm matching module 3-14, the height of the second group of continuous bosses 4-7-2 is higher than the height of the fourth stepped ridge, and the second group of continuous bosses 4-7-2 includes three bosses that gradually rise from the outside to the inside; a lower left half-waveguide port 4-8 is formed at the left end of the X-axis groove portion, a lower right half-waveguide port 4-9 is formed at the right end of the X-axis groove portion, and a lower front half-waveguide port 4-10 is formed at the front end of the Y-axis groove portion.

[0055] like Fig.16 As shown, the left side of the X-axis groove portion is divided into a front left X-axis groove portion and a rear left X-axis groove portion by the left half fourth stepped ridge 4-6-1, and the right side of the X-axis groove portion is divided into a front right X-axis groove portion and a rear right X-axis groove portion by the right half fourth stepped ridge 4-6-2. The bottom surfaces of the front left X-axis groove portion, the rear left X-axis groove portion, the front right X-axis groove portion and the rear right X-axis groove are continuous three-level stepped bottom surfaces, and the height of the stepped bottom surface gradually increases from the outside to the inside in a stepped shape;

[0056] The Y-axis groove portion is divided into two parts, a left Y-axis groove portion and a right Y-axis groove portion, by the fifth stepped ridge 4-7. The bottom surfaces of the left Y-axis groove portion and the right Y-axis groove portion are continuous five-step stepped bottom surfaces, and the height of the stepped bottom surfaces gradually increases in steps from the outside to the inside. The inner end of the front left X-axis groove portion is connected to the inner end of the left Y-axis groove portion, and the inner end of the front right X-axis groove portion is connected to the inner end of the right Y-axis groove portion.

[0057] Further, such as Figure 9-10 , Fig.16 as well as Fig.17 As shown, a spacer 5 is provided in the insertion hole 4-5, the lower part of the spacer 5 closes the insertion hole 4-5, the upper part of the spacer 5 is inserted into the third waveguide channel on the rear side of the third waveguide ridge 3-7, and the lower end of the spacer 5 is fixed by a set screw 8; a cover 6 is formed on the lower surface of the lower cavity 4 corresponding to the insertion hole 4-5, and the lower end of the spacer 5 and the insertion hole 4-5 are closed by the cover 6;

[0058] When the upper cavity 3 is fixedly connected to the lower cavity 4, the upper left half waveguide port 3-11 is connected to the lower left half waveguide port 4-8 to form the seventh waveguide port, the upper right half waveguide port 3-12 is connected to the lower right half waveguide port 4-9 to form the eighth waveguide port, and the upper front half waveguide port 3-13 is connected to the lower front half waveguide port 4-10 to form the ninth waveguide port;

[0059] When the upper cavity 3 is fixedly connected to the lower cavity 4, the left upper flange connection part 3-2 is connected to the left lower flange connection part 4-2 to form a left flange connection part, the right upper flange connection part 3-3 is connected to the right lower flange connection part 4-3 to form a right flange connection part, and the front upper flange connection part 3-4 is connected to the front lower flange connection part 4-4 to form a front flange connection part.

[0060] Working principle:

[0061] The waveguide magic T structure is a four-port network. When the signal is input from the seventh waveguide port and the eighth waveguide port with equal amplitude and in phase or in reverse phase, the ninth waveguide port (H arm) has output or no output; the first waveguide port (E arm) has no output or has output. When the signal is input from the ninth waveguide port (H arm) / the first waveguide port (E arm), the signals output from the seventh waveguide port and the eighth waveguide port are equal amplitude and in phase / equal amplitude and in reverse phase, and the first waveguide port (E arm) / the ninth waveguide port (H arm) has no output.

[0062] The channels of the four ports (the first waveguide port, the seventh waveguide port, the eighth waveguide port and the ninth waveguide port) in the waveguide magic T described in the present application are all provided with a double-ridge structure, which can effectively increase the working bandwidth of the magic T; the channels in each port use a step structure for impedance matching. Compared with the oblique transition structure, the step structure requires a shorter matching length, which can effectively reduce the structure size; a step matching block structure (the second group of continuous bosses on the fourth step-shaped ridge) is added at the intersection of the four waveguides. The reflected waves generated by this structure offset the reflected waves caused by the discontinuity at the original joint, thereby achieving a better matching effect; adding a T-shaped metal diaphragm (spacer) in the direction parallel to the H arm electric field can further optimize the impedance matching, eliminate high-frequency resonance, and improve the port isolation. Compared with the cylindrical matching structure, the metal diaphragm can effectively reduce high-frequency resonance; the matching optimization of the E arm is achieved by relying on the E arm matching diaphragm block parallel to the E arm electric field. This structure is mainly used to improve the impedance matching of the E arm, reduce the reflected waves generated by the small discontinuous structure, and improve the port isolation.

[0063] The embodiments of the present invention do not provide specific size parameters of the structure, because different application requirements will have different performance index requirements, so the size is not fixed.

[0064] 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 the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. 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 double-ridge waveguide magic T, characterized in that: The invention comprises an upper waveguide section (1) arranged vertically, wherein the lower waveguide opening of the upper waveguide section (1) is connected to the upper waveguide opening of the lower waveguide section (2), the lower waveguide opening of the lower waveguide section (2) is connected to the upper waveguide opening of the upper cavity (3), the lower portion of the upper cavity (3) is fixedly connected to the lower portion of the upper cavity (4), and when the upper cavity (3) and the lower cavity (4) are fixedly connected, a cavity structure having a T-shaped cavity inside is formed, and the upper waveguide section (1) is connected to the T-shaped cavity of the cavity structure via the lower waveguide section (2); when the upper waveguide section (1) and the lower waveguide section (2) are connected, an E arm of the waveguide magic T is formed, and a forwardly extending portion of the cavity structure formed when the upper cavity (3) and the lower cavity (4) are fixedly connected forms an H arm of the waveguide magic T; The upper waveguide section (1) comprises an upper flange connection portion (1-1), a first connection tube portion (1-2) is formed on the lower surface of the upper flange connection portion (1-1), a vertical first waveguide channel is formed inside the upper flange connection portion (1-1) after being connected to the first connection tube portion (1-2), the upper end opening of the first waveguide channel is a first waveguide port (1-3), the lower end opening of the first waveguide channel is a second waveguide port (1-4), and a first waveguide ridge (1-5) is formed on each of two oppositely arranged wide side inner walls of the first waveguide channel; The upper cavity body (3) comprises an upper cavity plate (3-1), a left upper half flange connection portion (3-2) is formed on the left side of the upper cavity plate (3-1), a right upper half flange connection portion (3-3) is formed on the right side of the upper cavity plate (3-1), a front upper half flange connection portion (3-4) is formed on the front side of the upper cavity plate (3-1), a fifth waveguide port (3-5) is formed at a portion of the upper surface of the upper cavity plate (3-1) corresponding to the lower waveguide port of the lower waveguide section (2), a sixth waveguide port (3-6) is formed on the lower surface of the upper cavity plate (3-1) corresponding to the fifth waveguide port (3-5), a third waveguide channel is formed between the fifth waveguide port (3-5) and the sixth waveguide port (3-6), and a third waveguide ridge (3-7) is formed on each of two oppositely disposed wide side inner walls of the third waveguide channel; A T-shaped upper groove structure is formed on the lower surface of the upper cavity plate (3-1); the left side of the upper groove structure is divided into an upper left half groove by the sixth waveguide port (3-6); the right side of the upper groove structure is divided into an upper right half groove by the sixth waveguide port (3-6); the front side of the upper groove structure is divided into an upper front half groove by the sixth waveguide port (3-6); a third waveguide ridge (3-7) extends rightward along the lower surface of the upper cavity plate (3-1); A first stepped ridge (3-8) is formed on the right side of the lower surface of the body plate (3-1), wherein another third waveguide ridge (3-7) extends leftward along the lower surface of the upper cavity body plate, and a second stepped ridge (3-9) is formed on the left side of the lower surface of the upper cavity body plate; a third stepped ridge (3-10) extending outward is formed in the upper front half groove, and a horizontal E-arm matching module (3-14) is formed in the third waveguide channel near the inner end of the third stepped ridge (3-10).

2. The double-ridge waveguide magic T as claimed in claim 1, characterized in that: The lower waveguide section (2) comprises a lower flange connection portion (2-1), the upper surface of the lower flange connection portion (2-1) is provided with a mounting boss (2-2) adapted to the second waveguide port (1-4), a second waveguide channel is formed in the lower waveguide section (2), the second waveguide channel penetrates the mounting boss (2-2) and the lower flange connection portion (2-1), a third waveguide port (2-3) is formed on the upper surface of the mounting boss (2-2), and a fourth waveguide port (2-4) is formed on the lower surface of the lower flange connection portion (2-1), the second waveguide port (1-4) and the third waveguide port (2-3) are arranged opposite to each other, so that the first waveguide channel is connected to the second waveguide channel, and a second waveguide ridge (2-5) is formed on each of the two oppositely arranged wide side inner walls of the second waveguide channel.

3. The double-ridge waveguide magic T as claimed in claim 1, characterized in that: The heights of the first stepped ridge (3-8), the second stepped ridge (3-9) and the third stepped ridge (3-10) gradually increase in a stepped manner from the outside to the inside; an upper left half waveguide port (3-11) is formed on the outer side of the upper left half groove, an upper right half waveguide port (3-12) is formed on the outer side of the upper right half groove, and an upper front half waveguide port (3-13) is formed on the outer side of the upper front half groove.

4. The double-ridge waveguide magic T as claimed in claim 1, characterized in that: The upper left half groove is divided into two parts, front and rear, by the first stepped ridge (3-8); the bottom surfaces of the upper left half groove of the front and rear parts are stepped bottom surfaces, and the height of the stepped bottom surfaces increases gradually from the outside to the inside in a stepped manner; the upper right half groove is divided into two parts, front and rear, by the second stepped ridge (3-9); the bottom surfaces of the upper right half groove of the front and rear parts are stepped bottom surfaces, and the height of the stepped bottom surfaces increases gradually from the outside to the inside in a stepped manner; the upper front half groove is divided into two parts, left and right, by the third stepped ridge (3-10); the bottom surfaces of the front half grooves of the left and right parts are stepped bottom surfaces, and the height of the stepped bottom surfaces increases gradually from the outside to the inside in a stepped manner; and a sixth waveguide port (3-6) is connected to the upper left half groove, the upper right half groove, and the upper front half groove.

5. The double-ridge waveguide magic T as claimed in claim 1, characterized in that: The lower cavity (4) comprises a lower cavity plate (4-1), a left lower half flange connection portion (4-2) is formed on the left side of the lower cavity plate (4-1), a right lower half flange connection portion (4-3) is formed on the right side of the lower cavity plate, a front lower half flange connection portion (4-4) is formed on the front side of the lower cavity plate, and a plug hole (4-5) is formed on the upper surface of the lower cavity plate (4-1) at a position corresponding to the sixth waveguide port (3-6), and the plug hole (4-5) passes through the upper and lower surfaces of the lower cavity plate (4-1); A T-shaped lower groove structure is formed on the upper surface of the lower cavity plate (4-1), and the lower groove structure includes an X-axis groove portion extending left and right and a Y-axis groove portion extending front and back, a fourth stepped ridge (4-6) extending left and right is formed in the middle of the X-axis groove portion, and a fifth stepped ridge (4-7) extending front and back is formed in the middle of the Y-axis groove portion, and the fifth stepped ridge (4-7) is perpendicular to and in contact with the fourth stepped ridge (4-6).

6. The double-ridge waveguide magic T as claimed in claim 5, characterized in that: The fourth stepped ridge (4-6) comprises a left-half fourth stepped ridge (4-6-1) and a right-half fourth stepped ridge (4-6-2) which are arranged symmetrically on the left and right sides, and the left-half fourth stepped ridge (4-6-1) and the right-half fourth stepped ridge (4-6-2) are continuous four-level stepped structures that gradually increase in height from the outside to the inside; the fifth stepped ridge (4-7) comprises a first group of continuous bosses (4-7-1) close to the outside and a second group of continuous bosses (4-7-2) close to the four-step ridge, and the second group of continuous bosses (4-7-2) is located on the lower side of the E-arm matching module (3-14); The first group of continuous bosses (4-7-1) includes five bosses that gradually rise from the outside to the inside, the height of the second group of continuous bosses (4-7-2) is higher than the height of the fourth stepped ridge, and the second group of continuous bosses (4-7-2) includes three bosses that gradually rise from the outside to the inside; a lower left half waveguide port (4-8) is formed at the left end of the X-axis groove portion, a lower right half waveguide port (4-9) is formed at the right end of the X-axis groove portion, and a lower front half waveguide port (4-10) is formed at the front end of the Y-axis groove portion.

7. The double-ridge waveguide magic T as claimed in claim 6, characterized in that: The left side of the X-axis groove portion is divided into a front left X-axis groove portion and a rear left X-axis groove portion by the left half fourth stepped ridge (4-6-1), and the right side of the X-axis groove portion is divided into a front right X-axis groove portion and a rear right X-axis groove portion by the right half fourth stepped ridge (4-6-2), and the bottom surfaces of the front left X-axis groove portion, the rear left X-axis groove portion, the front right X-axis groove portion and the rear right X-axis groove are continuous three-level stepped bottom surfaces, and the height of the stepped bottom surfaces gradually increases in a stepped manner from the outside to the inside; The Y-axis groove portion is divided into a left Y-axis groove portion and a right Y-axis groove portion by the fifth stepped ridge (4-7); the bottom surfaces of the left Y-axis groove portion and the right Y-axis groove portion are continuous five-step stepped bottom surfaces, and the height of the stepped bottom surfaces gradually increases from the outside to the inside in a stepped manner; the inner end of the front left X-axis groove portion is connected to the inner end of the left Y-axis groove portion, and the inner end of the front right X-axis groove portion is connected to the inner end of the right Y-axis groove portion.

8. The double-ridge waveguide magic T as claimed in claim 6, characterized in that: A spacer (5) is arranged in the insertion hole (4-5), the lower part of the spacer (5) closes the insertion hole (4-5), and the upper part of the spacer (5) is inserted into the third waveguide channel on the rear side of the third waveguide ridge (3-7); a cover (6) is formed on the lower surface of the lower cavity (4) corresponding to the insertion hole (4-5), and the lower end of the spacer (5) and the insertion hole (4-5) are closed by the cover (6); When the upper cavity (3) is fixedly connected to the lower cavity (4), the upper left half waveguide port (3-11) and the lower left half waveguide port (4-8) are connected to form a seventh waveguide port, the upper right half waveguide port (3-12) and the lower right half waveguide port (4-9) are connected to form an eighth waveguide port, and the upper front half waveguide port (3-13) and the lower front half waveguide port (4-10) are connected to form a ninth waveguide port; When the upper cavity (3) is fixedly connected to the lower cavity (4), the left upper half flange connection part (3-2) and the left lower half flange connection part (4-2) are connected to form a left flange connection part, the right upper half flange connection part (3-3) and the right lower half flange connection part (4-3) are connected to form a right flange connection part, and the front upper half flange connection part (3-4) and the front lower half flange connection part (4-4) are connected to form a front flange connection part.

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