Dual-ridge waveguide magic-T

Abstract

The present invention discloses a double-ridge waveguide magic T, which relates to the field of microwave technology. The double-ridge waveguide magic T includes an upper waveguide section arranged vertically, 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, a lower cavity is fixedly connected below the upper cavity, and 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 are connected to form the E arm of the waveguide magic T, and the part of the cavity structure formed by fixedly connecting the upper cavity and the lower cavity extending forward constitutes the H arm of the waveguide magic T. The waveguide magic T has the advantages of wide operating bandwidth, good matching effect, small volume and can effectively reduce high-frequency resonance, etc.

Description

Technical Field

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

[0002] In microwave systems, three types of connectors, namely ET, HT, and Magic Tee, are commonly used as power distribution / synthesis elements. Among them, the waveguide ET connector can output the signal input from the E port at equal amplitude and opposite phase at both ends of the balanced arm. Conversely, if signals are input at equal amplitude and opposite phase at both ends of the balanced arm, they are synthesized and output at the E port. The waveguide HT connector can output the signal input from the H port at equal amplitude and in-phase at both ends of the balanced arm. Conversely, if signals are input at equal amplitude and in-phase at both ends of the balanced arm, they are synthesized and output at the H port. The waveguide magic T is a new structure combined by ET and HT. Its characteristics are that it has a total of 4 arms, the two ends of the balanced arm are symmetrical, and there are also an E arm and an H arm respectively. The signal input from the E arm will be output at equal amplitude and opposite phase at both ends of the balanced arm, and the H arm is isolated; the signal input from the H arm will be output at equal amplitude and in-phase at both ends of the balanced arm, and the E arm is isolated; the signal input from any end of the balanced arm is equally divided and output at the E arm and the H arm, and the other end of the corresponding balanced arm is isolated. Therefore, the magic T has the characteristics of port isolation, 3dB coupling between adjacent ports, and perfect matching. Its function is more complete compared with single ET and HT. In the microwave field, especially in power synthesis / distribution, monopulse radar sum-difference comparators, impedance bridges, balanced duplexers, microwave discriminators, radar transmit-receive switches, balanced mixers, phase shifters, etc. Although the waveguide magic T has wide applicability in microwave systems, the matching effect of the existing waveguide magic T is generally average and there are many high-frequency resonances, resulting in poor use effects. Summary of the Invention

[0003] The technical problem to be solved by the present invention is how to provide a double-ridge waveguide magic T with a wide working bandwidth, good matching effect, and capable of effectively reducing high-frequency resonances.

[0004] To solve the above technical problem, the technical solution adopted by the present invention 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, a lower cavity is fixedly connected below the upper cavity, and 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 connected to the T-shaped cavity of the cavity structure through the lower waveguide section; the upper waveguide section and the lower waveguide form the E arm of the waveguide magic T after connection, and the part where the cavity structure formed by fixedly connecting the upper cavity and the lower cavity extends forward forms the H arm of the waveguide magic T.

[0005] A further technical solution lies in that: the upper waveguide section includes an upper flange connection part, a first connection cylinder part is formed on the lower surface of the upper flange connection part, a vertical first waveguide channel is formed inside after the upper flange connection part is connected to the first connection cylinder part, 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 wide side inner walls of the first waveguide channel arranged oppositely.

[0006] A further technical solution lies in that: the lower waveguide section includes a lower flange connection part, an installation boss adapted to the second waveguide port is arranged on the upper surface of the lower flange connection part, a second waveguide channel is formed inside the lower waveguide section, after the second waveguide channel penetrates through the installation boss and the lower flange connection part, a third waveguide port is formed on the upper surface of the installation boss and a fourth waveguide port is formed on the lower surface of the lower flange connection part, the second waveguide port and the third waveguide port are arranged oppositely so that the first waveguide channel is communicated with the second waveguide channel, and a second waveguide ridge is formed on each of the two wide side inner walls of the second waveguide channel arranged oppositely.

[0007] A further technical solution lies in that: the upper cavity includes an upper cavity plate, a left upper half flange connection part is formed on the left side of the upper cavity plate, a right upper half flange connection part is formed on the right side of the upper cavity plate, a front upper half flange connection part is formed on the front side of the upper cavity plate, a fifth waveguide port is provided at a position on the upper surface of the upper cavity plate corresponding to the lower waveguide port 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 wide side inner walls of the third waveguide channel arranged oppositely;

[0008] 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, the front side of the upper groove structure is divided into an upper front half groove by the sixth waveguide port, one of the third waveguide ridges extends rightward along the lower surface of the upper cavity plate, a first stepped ridge is formed on the right side of the lower surface of the upper cavity plate, the other third waveguide ridge extends leftward 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; a horizontal E-arm matching module is formed in the third waveguide channel near the inner end of the third stepped ridge.

[0009] A further technical solution lies in that: the lower cavity includes a lower cavity plate, a left lower half flange connecting portion is formed on the left side of the lower cavity plate, a right lower half flange connecting portion is formed on the right side of the lower cavity plate, a front lower half flange connecting portion is formed on the front side of the lower cavity plate, a jack is formed at a position corresponding to the sixth waveguide port on the upper surface of the lower cavity plate, and the jack penetrates 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. 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, and a fifth stepped ridge extending front and back is formed in the middle of the Y-axis groove portion. The fifth stepped ridge is perpendicular to and in contact with the fourth stepped ridge.

[0011] A further technical solution lies in 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 behind the third waveguide ridge; a cover is formed on the lower surface of the lower cavity corresponding to the jack, and the lower side 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 a seventh waveguide port, the upper right half waveguide port and the lower right half waveguide port are connected to form an eighth waveguide port, and the upper front half waveguide port and the lower front half waveguide port are connected to form a ninth waveguide port; the heights of the second stepped ridge and the third stepped ridge gradually increase in a stepped manner from the outside to the inside; an upper left half waveguide port is formed on the outside of the upper left half groove, an upper right half waveguide port is formed on the outside of the upper right half groove, and a front half waveguide port is formed on the outside of the upper front half groove.

[0012] The beneficial effects of adopting the above technical solutions are as follows: double-ridge structures are arranged in the channels of the four ports (the first waveguide port, the seventh waveguide port, the eighth waveguide port, and the ninth waveguide port) of the waveguide magic T in the present application, which can effectively increase the working bandwidth of the magic T;

[0013] The channels in each port are impedance-matched by using a stepped structure. Compared with a slant transition structure, the stepped structure requires a shorter matching length and can effectively reduce the structural size;

[0014] A stepped matching block structure (the second group of continuous bosses on the fourth stepped ridge) is added at the intersection of the four waveguides. The reflected wave generated by this structure cancels out the reflected wave caused by the discontinuity at the original joint, thereby achieving a better matching effect;

[0015] Adding a T-shaped metal diaphragm (separator) 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 wave generated by the small discontinuous structure, and improve the port isolation at the same time. Brief Description of the Drawings

[0017] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0018] Figure 1 is a three-dimensional structural schematic diagram of the waveguide magic T according to an embodiment of the present invention;

[0019] Figure 2 is a three-dimensional structural schematic diagram of the waveguide magic T according to an embodiment of the present invention;

[0020] Figure 3 is a front view structural schematic diagram of the waveguide magic T according to an embodiment of the present invention ( Figure 1 viewpoint);

[0021] Figure 4 is a left view structural schematic diagram of the waveguide magic T according to an embodiment of the present invention ( Figure 1 viewpoint);

[0022] Figure 5 is a right view structural schematic diagram of the waveguide magic T according to an embodiment of the present invention ( Figure 1 viewpoint);

[0023] Figure 6 is a top view structural schematic diagram of the waveguide magic T according to an embodiment of the present invention ( Figure 1 viewpoint);

[0024] Figure 7 is a bottom view structural schematic diagram of the waveguide magic T according to an embodiment of the present invention ( Figure 1 viewpoint);

[0025] Figure 8 is a rear view structural schematic diagram of the waveguide magic T according to an embodiment of the present invention ( Figure 1 viewpoint);

[0026] Figure 9 is an exploded structural schematic diagram of the waveguide magic T according to an embodiment of the present invention;

[0027] Figure 10 is a cross-sectional structural schematic diagram of the waveguide magic T according to an embodiment of the present invention;

[0028] Figure 11It is a schematic structural diagram of the upper waveguide section in the waveguide magic T according to an embodiment of the present invention;

[0029] Figure 12 It is a schematic structural diagram of the lower waveguide section in the waveguide magic T according to an embodiment of the present invention;

[0030] Figure 13 It is a schematic structural diagram of the upper cavity in the waveguide magic T according to an embodiment of the present invention;

[0031] Figure 14 It is a schematic structural diagram of the upper cavity in the waveguide magic T according to an embodiment of the present invention;

[0032] Figure 15 It is a schematic structural diagram of the lower cavity in the waveguide magic T according to an embodiment of the present invention;

[0033] Figure 16 It is a schematic structural diagram of the lower cavity in the waveguide magic T according to an embodiment of the present invention;

[0034] Figure 17 It is a schematic structural diagram of the septum in the waveguide magic T according to an embodiment of the present invention;

[0035] Wherein: 1. Upper waveguide section; 1-1. Upper flange connection part; 1-2. First connection cylinder part; 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 part; 2-2. Installation 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 part; 3-3. Upper right half flange connection part; 3-4. Front upper half flange connection part; 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. Front upper half waveguide port; 3-14. E-arm matching module;

[0038] 4. Lower cavity; 4-1. Lower cavity plate; 4-2. Lower left half flange connection part; 4-3. Lower right half flange connection part; 4-4. Front lower half flange connection part; 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. Septum;

[0040] 6. Cover;

[0041] 7. Locating pin;

[0042] 8. Set screw. Detailed implementation manner

[0043] Combined with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

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

[0045] As Figures 1-10 shown, an embodiment of the present invention discloses a double-ridge waveguide magic T. The waveguide magic T is made of a metal material. The waveguide magic T includes 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 vertically arranged. 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 below the upper cavity 3. When the upper cavity 3 and the lower cavity 4 are fixedly connected, a cavity structure with a T-shaped cavity inside is formed. 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. The part where the cavity structure formed after the upper cavity 3 and the lower cavity 4 are fixedly connected extends forward to form the H arm of the waveguide magic T.

[0046] Further, as Figure 11As shown, the upper waveguide section 1 includes an upper flange connection portion 1-1. A number of positioning holes (with positioning pins 7 arranged in the positioning holes) and mounting holes are formed around the upper flange connection portion 1-1, for conveniently connecting the upper waveguide section 1 with other components; a first connection cylinder portion 1-2 is formed on the lower surface of the upper flange connection portion 1-1. After the upper flange connection portion 1-1 is connected to the first connection cylinder portion 1-2, a vertical first waveguide channel is formed inside thereof. 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. On the inner walls of two opposite wide sides of the first waveguide channel, a first waveguide ridge 1-5 is formed respectively, and the two first waveguide ridges 1-5 are arranged oppositely. The first waveguide channel is divided into two mutually connected parts by the two first waveguide ridges 1-5.

[0047] Further, as Figure 12 shown, the lower waveguide section 2 includes a lower flange connection portion 2-1. A number of positioning holes and mounting holes are formed around the upper flange connection portion 1-1, for conveniently and fixedly connecting the upper waveguide section 1 with the lower cavity 3; an installation boss 2-2 adapted to the second waveguide port 1-4 is arranged on the upper surface of the lower flange connection portion 2-1. A second waveguide channel is formed inside the lower waveguide section 2-1. After the second waveguide channel penetrates through the installation 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 installation 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 oppositely, so that the first waveguide channel is connected to the second waveguide channel. On the inner walls of two opposite wide sides of the second waveguide channel, a second waveguide ridge 2-5 is formed respectively, and the two second waveguide ridges 2-5 are arranged oppositely. The second waveguide channel is divided into two mutually connected parts by the two second waveguide ridges 2-5.

[0048] As Figures 13-14As shown, the upper cavity 3 includes an upper cavity plate 3-1. On the left side of the upper cavity plate 3-1, there is formed a left upper semi-flange connecting portion 3-2. On the right side of the upper cavity plate 3-1, there is formed a right upper semi-flange connecting portion 3-3. On the front side of the upper cavity plate 3-1, there is formed a front upper semi-flange connecting portion 3-4. At the position on the upper surface of the upper cavity plate 3-1 corresponding to the lower waveguide port of the lower waveguide section 2, there is a fifth waveguide port 3-5. On the lower surface of the upper cavity plate 3-1 corresponding to the fifth waveguide port 3-5, there is formed a sixth waveguide port 3-6. A third waveguide channel is formed between the fifth waveguide port 3-5 and the sixth waveguide port 3-6. On each of the two opposite wide-side inner walls of the third waveguide channel, there is formed a third waveguide ridge 3-7. The two third waveguide ridges 3-7 are arranged oppositely, and the third waveguide channel is divided into two mutually communicating parts by the two third waveguide ridges 3-7.

[0049] As Figure 9 and Figure 14 shown, on the lower surface of the upper cavity plate 3-1, there is formed a T-shaped upper groove structure. The left side of the upper groove structure is divided into an upper left semi-groove by the sixth waveguide port 3-6. The right side of the upper groove structure is divided into an upper right semi-groove by the sixth waveguide port 3-6. The front side of the upper groove structure is divided into an upper front semi-groove by the sixth waveguide port 3-6. One of the third waveguide ridges 3-7 extends rightward along the lower surface of the upper cavity plate 3-1, and a first stepped ridge 3-8 is formed on the right side of the lower surface of the upper cavity plate 3-1. The other third waveguide ridge 3-7 extends leftward along the lower surface of the upper cavity plate 3-1, 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 semi-groove. 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 can be split or integral.

[0050] Further, as Figure 14 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 in a stepped manner from the outside to the inside. An upper left semi-waveguide port 3-11 is formed on the outside of the upper left semi-groove. An upper right semi-waveguide port 3-12 is formed on the outside of the upper right semi-groove. An upper front semi-waveguide port 3-13 is formed on the outside of the upper front semi-groove.

[0051] Further, as Figure 14As shown, the upper left half groove is divided into front and rear parts by the first stepped ridge 3-8. The bottom surfaces of the upper left half grooves in the front and rear parts are stepped bottom surfaces, and the height of the stepped bottom surface gradually increases in a stepped manner from the outside to the inside. The upper right half groove is divided into front and rear parts by the second stepped ridge 3-9. The bottom surfaces of the upper right half grooves in the front and rear parts are stepped bottom surfaces, and the height of the stepped bottom surface gradually increases in a stepped manner from the outside to the inside. The upper front half groove is divided into left and right parts by the third stepped ridge 3-10. The bottom surfaces of the front half grooves in the left and right parts are stepped bottom surfaces, and the height of the stepped bottom surface gradually increases in a stepped manner from the outside to the inside. 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] As Figures 15-16 shown, the lower cavity 4 includes a lower cavity plate 4-1. A lower left half flange connection part 4-2 is formed on the left side of the lower cavity plate 4-1. A lower right half flange connection part 4-3 is formed on the right side of the lower cavity plate. A lower front half flange connection part 4-4 is formed on the front side of the lower cavity plate. An insertion hole 4-5 is formed at a position corresponding to the sixth waveguide port 3-6 on the upper surface of the lower cavity plate 4-1. The insertion hole 4-5 penetrates the upper and lower surfaces of the lower cavity plate 4-1.

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

[0054] Further, as Figure 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 left and right. 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 outside to inside. The fifth stepped ridge 4-7 includes a first group of continuous convex platforms 4-7-1 near the outside and a second group of continuous convex platforms 4-7-2 near the four-stepped ridge. The first group of continuous convex platforms 4-7-1 includes five convex platforms that gradually increase in height from outside to inside. The second group of continuous convex platforms 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 convex platforms 4-7-2 is higher than the height of the fourth stepped ridge. The second group of continuous convex platforms 4-7-2 includes three convex platforms that gradually increase in height from outside to inside. A lower left half waveguide port 4-8 is formed at the left end of the X-axis groove portion, and a lower right half waveguide port 4-9 is formed at the right end of the X-axis groove portion. A lower front half waveguide port 4-10 is formed at the front end of the Y-axis groove portion.

[0055] As Figure 16 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. 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 in a stepped manner from outside to inside.

[0056] 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-level stepped bottom surfaces, and the height of the stepped bottom surface gradually increases in a stepped manner from outside to inside. The inner end of the front left X-axis groove portion is communicated with the inner end of the left Y-axis groove portion, and the inner end of the front right X-axis groove portion is communicated with the inner end of the right Y-axis groove portion.

[0057] Further, as Figures 9-10 、 Figure 16 and Figure 17 shown, a spacer 5 is arranged in the jack 4-5. The lower part of the spacer 5 closes the jack 4-5. The upper part of the spacer 5 is inserted into the third waveguide channel behind the third waveguide ridge 3-7. 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 jack 4-5. The lower side end of the spacer 5 and the jack 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 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;

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

[0060] Working principle:

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

[0062] In the waveguide magic T of the present application, double-ridge structures are provided in the channels of the four ports (the first waveguide port, the seventh waveguide port, the eighth waveguide port, and the ninth waveguide port), which can effectively increase the working bandwidth of the magic T; the channels in each port use a stepped structure for impedance matching. Compared with the inclined transition structure, the stepped structure requires a shorter matching length and can effectively reduce the structural size; a stepped matching block structure (the second set of continuous convex platforms on the fourth stepped ridge) is added at the intersection of the four waveguides. The reflected wave generated by this structure cancels out the reflected wave caused by the discontinuity at the original joint, thereby achieving a better matching effect; a T-shaped metal diaphragm (separator) is added in the direction parallel to the electric field of the H arm, which 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 an 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 wave generated by the small discontinuity structure, and at the same time improve the port isolation.

[0063] The specific dimensional parameters of the structure are not provided in the embodiments of the present invention because different performance index requirements will be there for different application needs, so the dimensions are 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate 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 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), another third waveguide ridge (3-7) thereof 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); 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), the lower groove structure comprising 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, 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); 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 fourth stepped 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; 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; 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.

2. The double-ridge waveguide magic T as claimed in claim 1, characterized in that: The upper waveguide section (1) comprises an upper flange connection portion (1-1), a first connection cylinder portion (1-2) being formed on the lower surface of the upper flange connection portion (1-1), a vertical first waveguide channel being formed inside the upper flange connection portion (1-1) after being connected to the first connection cylinder portion (1-2), an upper end opening of the first waveguide channel being a first waveguide port (1-3), a lower end opening of the first waveguide channel being a second waveguide port (1-4), and a first waveguide ridge (1-5) being formed on each of two oppositely disposed wide side inner walls of the first waveguide channel.

3. The double-ridge waveguide magic T as claimed in claim 2, 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.

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 upper front half groove 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 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.

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