KR100706606B1 - Double ridge waveguide transition - Google Patents

Abstract

The present invention relates to a double ridge waveguide transition apparatus that can be used without changing the shape of the inner core of the coaxial connector for the millimeter wave band, comprising: a waveguide; Upper and lower ridges respectively inserted into upper and lower centers of the inside of the waveguide; And a feeding means inserted into the waveguide in a direction perpendicular to the longitudinal direction of the waveguide, wherein the feeding means comprises: a feeding dielectric for power feeding, which matches the inner width and height of the waveguide; A metal pattern for signal transmission applied to one surface of the dielectric for power supply for signal transmission; A grounding metal conductor applied to the other surface of the dielectric for feeding and grounded; An inner core of the coaxial cable connected to the signal transmission metal pattern to transfer energy to the upper ridge and inserted into the waveguide in a direction perpendicular to the length direction of the waveguide; A dielectric of the coaxial cable for shielding the inner core of the coaxial cable and the outer core of the coaxial cable; And first and second via holes existing between the signal transmission metal pattern and the ground metal conductor to allow a current to flow between the signal transmission metal pattern and the ground metal conductor.

Double ridge, waveguide, transition device

Description

Double Ridge Waveguide Transition

1 is a feed structure diagram of a broadband waveguide transition apparatus using a conventional coaxial cable,

2 is a power supply structure diagram of a waveguide transition apparatus using a conventional microstrip line;

3A and 3B are a perspective view and a side view of an embodiment of a power supply structure of a double ridge waveguide transition apparatus according to the present invention;

Figure 4 is a front view of an embodiment showing a power supply structure of the waveguide transition apparatus according to the present invention,

Figure 5 is a perspective view of an embodiment of a microstrip line of the feeding structure of the waveguide transition apparatus according to the present invention,

6 is a perspective view of an embodiment of a microstrip line of a modified feed structure of a waveguide transition apparatus according to the present invention;

7 is a side view of an embodiment of a microstrip line of a modified feed structure of a waveguide transition apparatus according to the present invention;

8 is a front view showing an embodiment of a first conductor of the modified feed structure of the waveguide transition apparatus according to the present invention;

9 is a front view of an embodiment showing a second conductor of the modified feed structure of the waveguide transition apparatus according to the present invention;

FIG. 10 is a diagram illustrating a comparison between the power supply structure of the conventional waveguide transition device and the power supply structure of the waveguide transition device according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1, 101: waveguide 2: baseline

3: first rectangular ridge 4: second rectangular ridge

5: first metal conductor 6: second metal conductor

7: third metal conductor 8: part of coaxial cable

9: first dielectric 10: first cylindrical metal conductor

11: second cylindrical metal conductor 12: third cylindrical metal conductor

13: 4th cylindrical metal conductor 20, 102: upper ridge

21, 103: lower ridge 22: fourth metal conductor

23: fifth metal conductor 24: first metal structure

25: second metal structure 26: cavity

27: coaxial cable 28, 106: inner core of the coaxial cable

29 outer core of coaxial cable 30 second dielectric

31: conductor tab 32: air

33: microstrip line 34: ground plane

35: third dielectric 36: solder joint

37 metal wall 104 fourth dielectric

105: metal pattern for signal transmission 107: fifth dielectric of coaxial cable 108: first metal conductor for grounding 109: first via hole of feed structure

110: second via hole of feeding structure 111: sixth dielectric

112: seventh dielectric 113: sixth metal conductor

114: seventh metal conductor 115: second ground metal conductor

116: third via hole 117: fourth via hole

The present invention relates to a double ridge waveguide transition apparatus, and more particularly, the inner core of the coaxial cable is directed from the outside of the waveguide to the inside to be perpendicular to the longitudinal direction of the waveguide (typically defined as the direction in which energy in the waveguide travels). By inserting in the direction and by using a metal pattern having a predetermined shape and a grounding conductor on the dielectric for power supply, a feed structure capable of impedance matching over a wide band is proposed, thereby changing the shape of the inner core of the coaxial connector for the millimeter wave band. A double ridge waveguide transition apparatus, which can be used without using the present invention.

In general, a double ridge waveguide transition device is used for an antenna or a broadband transmission line used in broadband wireless communication.

Conventional coaxial cable to waveguide transitions or microstrip line to waveguide transitions use TEM (Transverse electromagnetic) mode / Quasi TEM mode in a waveguide. A device that converts to electric mode, which is essential for most microwave / millimeter wave communication devices that use waveguides.

1 is a schematic diagram of a power supply structure of a broadband waveguide transition apparatus using a conventional coaxial cable.

As shown in FIG. 1, the broadband waveguide transition apparatus using a conventional coaxial cable is located inside the waveguide 1, the reference line 2, and the waveguide 1 to lower the cutoff frequency of the waveguide 1 and to guide the waveguide. The first and second rectangular ridges 3 and 4 and tapered to extend the first and second rectangular ridges 3 and 4 to allow (1) to have broadband characteristics. Respectively located at the upper and lower portions of the first and second metal conductors 5 and 6 for impedance matching, and located at the rear side of the waveguide 1 to directly short-circuit the upper and lower surfaces of the waveguide 1 and back and forth. A third metal conductor (7) capable of inducing impedance matching while moving, a portion of the coaxial cable (8), a first dielectric (9) acting as a shield between the inner and outer cores of the coaxial cable, and a short circuit with the waveguide (1) First cylindrical metal conductor 10 for a kind of impedance matching, each The inside diameter for the impedance matching, including the second to fourth cylindrical current conductor (11) to (13) are designed differently, respectively.

The feeder of the broadband waveguide transition apparatus using the conventional coaxial cable having the above-described configuration inserts the inner core of the coaxial cable into the broadband waveguide to generate and feed electromagnetic coupling.

Since a typical standard rectangular waveguide does not have a wide frequency band, an upper ridge and a lower ridge are inserted into the waveguide to obtain a waveguide having broadband characteristics. As described above, the waveguide in which the upper ridge and the lower ridge are inserted into the waveguide is referred to as a 'double-ridge waveguide'.

However, when feeding power using a coaxial cable to a double-ridge waveguide, a direct connection between the inner core of the coaxial cable or coaxial connector and the upper ridge in the waveguide may be required, and impedance matching may be required. For this purpose, highly precise mechanical processing is required at the lower ridge through which the inner core of the coaxial cable passes. Therefore, when the waveguide is used for the millimeter wave band having a wavelength length of only a few mm, mechanical processing of the waveguide is very difficult.

FIG. 2 is a schematic diagram illustrating a feeding structure of a waveguide transition apparatus using a conventional microstrip line, and illustrates a structure in which a microstrip line is inserted and fed in parallel to the waveguide from the outside of the waveguide using the microstrip line.

As shown in FIG. 2, the waveguide transition apparatus using a conventional microstrip line includes a tapered upper ridge 20 and a lower ridge 21, a fourth metal conductor connected to the upper ridge 20 and the waveguide body. 22, a fifth metal conductor 23 connected to the lower ridge 21 and the waveguide body, and first and second metal structures 24 for forming the cavity 26 and the coaxial cable 27 as the end of the waveguide. 25) inner core 28 of coaxial cable, outer core 29 of coaxial cable, dielectric 30 made of Teflon, conductor tab 31 connected to inner core 28 of coaxial cable, conductor, 26, a third dielectric 35, microstrip line located between commonly used air 32, microstrip line 33, ground plane 34 and microstrip line 33 A solder joint 36 and a metal wall 37 for bonding between the 33.

The power supply of the waveguide transition apparatus using the conventional microstrip line having the above-described structure electrically or mechanically bonds the inner core 28 of the coaxial cable to the microstrip line 33 inserted into the waveguide. At the same time as the external energy is introduced into the inside, the microstrip line 33 is designed to contact the upper ridge 20 inside the waveguide to finally feed the waveguide.

However, the power supply structure of the waveguide transition apparatus using the conventional microstrip line has a transmission line inserted side by side in the longitudinal direction of the waveguide for convenience of design, and thus, the power supply perpendicular to the longitudinal direction of the waveguide, which is frequently used, is frequently used. There is a need for an efficient structure for the structure.

On the other hand, looking at an example of a similar prior art related to the present invention, "TRANSITION FROM A WAVEGUIDE TO A STRIP TRANSMISSION LINE" (US Patent Registration No. 6265950 B1), which is a structure for manufacturing a transition at a low cost. 2001. 06. 24 registered) (hereinafter referred to as 'first prior art'), wherein the configuration of the transition device in the first prior art includes a rectangular waveguide, a top and bottom metal ridge inside the waveguide, and a waveguide. It consists of a microstrip line inserted from the outside to the inside for powering. The upper ridge inside the waveguide is tapered, stepped, or arced for impedance matching. In addition, the signal line of the microstrip line is electrically and mechanically connected to the upper ridge inside the waveguide, so that energy can be transmitted smoothly. On the contrary, the present invention is a type of microstrip line structure for feeding the vertical direction of the model in which the upper and lower ridges in the waveguide exist, via holes for impedance matching, modified ground planes and metal patterns. It is composed of a dielectric (Substrate) for fixing the.

In particular, the first prior art and the present invention differ in the vertical / horizontal direction in which the power feeding direction is based on the waveguide. In addition, in the first prior art, the metal conductor inside the waveguide is modified for impedance matching, whereas in the present invention, the metal pattern on the dielectric used for feeding is different from each other.

On the other hand, looking at another example of the prior art related to the present invention, "DOUBLE-RIDGE WAVEGUIDE TO MICROSTRIP COUPLING (US patent), which discloses a low loss connection method and mechanical contents between a double-ridge waveguide and a microstrip circuit. Registration No. 4973925, registered on November 27, 1990) (hereinafter referred to as 'second prior art'), wherein the configuration of the transition device in the second prior art is a rectangular waveguide, a top and bottom metal inside the waveguide. It consists of a ridge and a microstrip line inserted from the outside to feed the waveguide. The upper and lower ridges inside the waveguide are tapered for impedance matching. At this time, the upper ridge becomes narrower and the height increases toward the feeding structure, while the lower conductor increases only the width toward the feeding structure, which is equal to the width of the waveguide at the end. In contrast, the present invention provides a microstrip line structure for feeding power in the vertical direction of a model in which the upper and lower conductors inside the waveguide exist, via holes for impedance matching, and modified ground planes. It is composed of a dielectric (Substrate) for fixing the.

In particular, the second prior art and the present invention differ in the vertical / horizontal direction in which the feed direction is based on the waveguide. In addition, in the case of the second prior art, the inner wall of the waveguide and the metal ridge of the inside are modified for impedance matching, whereas the metal pattern on the dielectric used for feeding is modified in the present invention. Differ

On the other hand, looking at another example of the prior art related to the present invention, "MICROWAVE FREQUENCY proposed a structure of the housing (Housing) and the transition device to hide the integrated circuit and protect the transmission line in the device connecting the waveguide and the transmission line DEVICE COMPRISING AT LEAST A TRANSITION BETWEEN A TRANSMISSION LINE INTEGRATED ON A SUBSTRATE AND A WAVEGUIDE (US Patent Registration No. 5415394, Registered on May 09, 1995) (hereinafter referred to as 'Third Prior Art'). The transition device arrangement in the third prior art consists of a rectangular waveguide and a microstrip line present therein for feeding the waveguide. Then, for impedance matching, the ground plane of a part opposite the terminal of the microstrip line is removed and a cavity is inserted into a portion of the waveguide. In addition, an impedance transformer using a microstrip line was added. On the contrary, the present invention is a kind of microstrip line structure for feeding the vertical direction of the model in which the upper and lower ridges inside the waveguide, the via hole for impedance matching, the modified ground plane, and fixing the same. It is composed of a dielectric (Substrate).

Although the third prior art and the present invention have the same feeding direction with respect to the waveguide, the microstrip line of the third prior art is not connected to the wall surface or the extension surface of the waveguide, and the electromagnetic coupling ( Coupling is used to transfer energy. However, in the present invention, the power supply structure is different in that the power supply structure is connected to one of the upper and lower metals in the waveguide to propose a structure in which a high frequency current flows directly.

On the other hand, looking at another example of the prior art related to the present invention, "WAVEGUIDE-MICROSTRIP TRANSMISSION LINE TRANSITION STRUCTURE HAVING AN INTEGRAL SLOT" which proposed a microstrip line structure suitable for coupling with an open waveguide on one side AND ANTENNA COUPLING ARRANGEMENT (US Patent Registration No. 5793263, registered on August 11, 1998) (hereinafter referred to as 'fourth prior art'), and the fourth prior art power feeding structure has an open standard on one side. It consists of a waveguide, a ground plane designed for it, and a slot on the ground plane and a microstrip antenna electrically coupled to the slot. Thus, bandwidth is dependent on general waveguide specifications. In contrast, the present invention relates to a type of microstrip line structure for feeding power in the vertical direction of a model having upper and lower ridges inside the waveguide, via holes for impedance matching, modified ground planes, and these metals. It is composed of a dielectric (Substrate) for fixing the structure.

Although the fourth prior art and the present invention feed in the same direction with respect to the waveguide, the microstrip line of the fourth prior art feeds using an open side of the waveguide and opens the aperture (Aperture, Slot). Use energy to rely on electrical coupling. However, in the present invention, the power supply structure is different in that both are connected to one of the upper and lower ridges in the waveguide and propose a structure in which a high frequency current flows directly.

The present invention has been proposed to solve the above problems, by inserting the inner core of the coaxial cable from the outside of the waveguide to the inside to be inserted in a direction perpendicular to the longitudinal direction of the waveguide (usually defined as the direction of the energy in the waveguide). By using a metal pattern and a grounding conductor having a predetermined shape on the dielectric for power supply, a feeding structure capable of impedance matching over a wide band can be used without changing the shape of the inner core of the millimeter wave band coaxial connector. It is an object of the present invention to provide a double ridge waveguide transition apparatus.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

The present invention for achieving the above object is a waveguide; Upper and lower ridges respectively inserted into upper and lower centers of the inside of the waveguide; And a feeding means inserted into the waveguide in a direction perpendicular to the longitudinal direction of the waveguide, wherein the feeding means comprises: a feeding dielectric for power feeding, which matches the inner width and height of the waveguide; A metal pattern for signal transmission applied to one surface of the dielectric for power supply for signal transmission; A grounding metal conductor applied to the other surface of the dielectric for feeding and grounded; An inner core of the coaxial cable connected to the signal transmission metal pattern to transfer energy to the upper ridge and inserted into the waveguide in a direction perpendicular to the length direction of the waveguide; A dielectric of the coaxial cable for shielding the inner core of the coaxial cable and the outer core of the coaxial cable; And first and second via holes existing between the signal transmission metal pattern and the ground metal conductor to allow a current to flow between the signal transmission metal pattern and the ground metal conductor.
In addition, the present invention for achieving the above object is a waveguide; Upper and lower ridges respectively inserted into upper and lower centers of the inside of the waveguide; And a feeding means inserted into the waveguide in a direction perpendicular to the longitudinal direction of the waveguide, wherein the feeding means has one side connected to the first metal conductor in the direction of the opening surface of the waveguide, and the other side is shorted to the waveguide. A first dielectric connected with the second metal conductor in the longitudinal cross-sectional direction thereof; A second dielectric having one side connected to the second metal conductor in an opening surface direction of the waveguide and the other side connected to a first ground metal conductor in a shorted longitudinal section direction of the waveguide; It is applied on the first dielectric material and is connected to the inner core of the coaxial cable, and is not directly connected to the lower surface of the waveguide and the lower ridge, but is connected to the upper ridge and is connected to the upper and side edges and the lower edge of the waveguide. A first metal conductor having a '-' pattern along the line; The second metal conductor applied on the first and second dielectrics and having a 'C'-shaped pattern along upper and side edges and lower edges of the waveguide; A first grounding metal conductor on the second dielectric and connected to the waveguide; And first and second via holes electrically connecting the first metal conductor and the first ground metal conductor.

The above objects, features, and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. Could be. In describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3A and 3B are a perspective view and a side view of an embodiment of a power supply structure of a double ridge waveguide transition apparatus according to the present invention.

As shown in Figures 3a and 3b, the waveguide transition apparatus according to the present invention, the waveguide 101, the upper ridge 102, the lower ridge 103, the fourth dielectric 104, for signal transmission of the feed structure The metal pattern 105, the inner core 106 of the coaxial cable, the dielectric 107 of the coaxial cable, the metal conductor 108 for the first ground, the first via hole 109 of the feeding structure, and the second via hole 110 of the feeding structure. ).

Here, the upper ridge 102 and the lower ridge 103 are each made of a metal having a rectangular parallelepiped shape, and are inserted into a center of the waveguide made of a rectangular metal conductor to form a double ridge waveguide. In this case, the inserted upper ridge 102 and the lower ridge 103 serve to lower the cutoff frequency of a general rectangular waveguide and to widen the operation region in a fundamental mode. In order to feed the double ridge waveguide, a structure capable of supplying energy between the upper ridge 102 and the lower ridge 103 is required.

Therefore, in the present invention, the dielectric for power supply 104 and the signal transmission metal pattern 105 applied to one surface of the dielectric for power supply 104 coincide with the inner width and inner height of the waveguide 101 are applied to the other surface. The structure having the grounding metal conductor 108 is inserted into the waveguide 101 in a direction perpendicular to the longitudinal direction of the waveguide 101. In addition, the signal-transmitting metal pattern 105 and the inner core 106 of the coaxial cable are electrically and mechanically connected so that energy transmitted from the outside of the waveguide 101 to the inside and transmitted through the coaxial cable is transmitted through the fourth dielectric 104. Through the metal pattern 105 for signal transmission of the) to be smoothly transmitted to the upper ridge 102 and the lower ridge 103 of the waveguide 101.

In addition, the signal transmission metal pattern 105 on the fourth dielectric 104 is electrically / mechanically connected to the upper ridge 102 so that the high frequency current of the signal transmission metal pattern 105 is directly connected to the upper ridge 102. On the contrary, the high frequency current of the upper ridge 102 is directly transmitted to the signal transmission metal pattern 105 to be transmitted to the outside of the waveguide 101 through a coaxial cable or a coaxial connector.

The metal pattern 105 for signal transmission on the power supply dielectric 104 has a predetermined shape for matching with the impedance of the coaxial cable or the coaxial connector and the impedance of the waveguide 101. In the present invention, an inverted trapezoidal shape is illustrated. It can also be tapered or stepped. In addition, the signal transmission metal pattern 105 does not have a mechanical direct connection with the lower surface of the waveguide 101 and the lower ridge 103, but the one side of the lower ridge 103 is controlled by controlling the distance between the lower surface and the impedance. give.

In addition, as the first via hole 109 and the second via hole 110 are inserted between the signal transmission metal pattern 105 and the first grounding metal conductor 108, the signal transmission metal pattern 105 and the first via hole 110 are inserted. Current may flow between the grounding metal conductors 108, and the first grounding metal conductors 108 are electrically and mechanically bonded to the waveguide 101 to be electrically connected to each other. In this case, the first via hole 109 and the second via hole 110 may have a cylindrical shape and may be made of a bulk metal so that a high frequency current may flow between the signal transmission metal pattern 105 and the first ground metal conductor 108. Or the surface is coated with metal. Therefore, the first via hole 109 and the second via hole 110 as described above also affect the impedance matching of the transition device.

4 and 5 are front and perspective views of the power supply structure of the double ridge waveguide transition apparatus according to the present invention as described above.

Figure 6 is a perspective view of one embodiment of a microstrip line of a modified feed structure of a double ridge waveguide transition apparatus according to the present invention.

As shown in FIG. 6, the sixth dielectric material 111, the seventh dielectric material 112, and the sixth metal conductor 113 and the sixth dielectric material 111 applied on the sixth dielectric material 111 and the seventh dielectric material 111. The seventh metal conductor 114 coated in the same shape on the dielectric 112 and the second ground metal conductor 115 existing on the seventh dielectric 112 and electrically and mechanically connected to the waveguide 101. ), The third via hole 116 and the fourth via hole 117 electrically connecting the sixth metal conductor 113, the seventh metal conductor 114, and the second ground metal conductor 115 of the modified feed structure. It shows a modified feed structure consisting of.

7 is a side view of an embodiment of a microstrip line of a modified feed structure of a waveguide transition apparatus according to the present invention.

As shown in FIG. 7, the sixth metal conductor 113 is electrically and mechanically connected to the inner core 106 of the coaxial cable, similar to the feeding structure described above, and is formed in the lower surface of the waveguide 101 and in the waveguide. The upper ridge 102 is electrically connected mechanically without directly contacting the lower ridge 103. In addition, a sixth metal conductor 113 is present on one surface of the sixth dielectric material 111 in the direction of the opening of the waveguide 101, and a shorted longitudinal section of the waveguide 101 is present. ) Exists. In addition, a seventh metal conductor 114 is present on one surface of the seventh dielectric material 112 in the direction of the open surface of the waveguide 101, and a second ground metal conductor is formed on the other surface of the waveguide 101 in the shorted longitudinal direction. 115 is present.

8 is a front view of an embodiment of a sixth metal conductor of the waveguide transition apparatus according to the present invention.

As shown in FIG. 8, the sixth metal conductor 113 is connected to the upper ridge 102 and has a '-' pattern along the upper and side edges and the lower edge of the waveguide 101.

9 is a front view of an embodiment of a seventh metal conductor of the waveguide transition apparatus according to the present invention.

As shown in FIG. 9, the seventh metal conductor 117 has a pattern of 'c' like the sixth metal conductor 113. The width of the pattern may vary depending on the thickness of the waveguide 101 of the sixth dielectric 111 and the seventh dielectric 112 and the size of the upper ridge 102 and the lower ridge 103 inside the waveguide. And ultimately affect the broadband impedance matching of the transition device.

FIG. 10 is a diagram illustrating a comparison between the power supply structure of the conventional waveguide transition device and the waveguide transition device power supply structure according to the present invention.

FIG. 10 shows a standing wave ratio (SWR) characteristic of a conventional transition device and the waveguide transition device according to the present invention of FIG. 3A according to the present invention when the feeding structure proposed in FIGS. 5 and 6 is applied. Each is shown. In FIG. 10, the reference value for determining the bandwidth of the transition device is about SWR = 2, and a value of about 89% of energy input into the waveguide and 11% of energy reflected from the feed structure is set. It is a value of a commonly used level. In FIG. 10, the proposed model 1 is a standing wave ratio characteristic when the feed structure shown in FIG. 5 is applied to the waveguide 101 shown in FIG. 3, and the proposed model 2 corresponds to the waveguide 101 shown in FIG. 6. The standing wave ratio characteristics in the case of applying the power supply structure shown in FIG.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

In the present invention as described above, the inner core of the coaxial cable is inserted from the outside of the waveguide toward the inside to be inserted in a direction perpendicular to the longitudinal direction of the waveguide (typically defined as the direction in which energy in the waveguide proceeds), By using a metal pattern having a predetermined shape and a grounding conductor, a feed structure capable of impedance matching over a wide band can be proposed, which can be used without changing the shape of the inner core of the millimeter wave band coaxial connector.

In addition, the double-ridge waveguide transition apparatus according to the present invention has an effect of providing a structure for feeding the waveguide and the vertical direction with a simple structure and excellent electrical characteristics.

According to the present invention, compared with the conventional power feeding structure of a broadband waveguide using a coaxial cable, not only has similar electrical characteristics, but also the structure of the microstrip line reduces impedance mismatch due to mechanical processing. In addition, since the feeding structure is designed perpendicularly to the longitudinal direction of the waveguide, there is an effect that can be very usefully utilized in actual antenna transition device or other waveguide feeding.

Claims (10)

delete wave-guide; Upper and lower ridges respectively inserted into upper and lower centers of the inside of the waveguide; Feeding means inserted into the waveguide in a direction perpendicular to the longitudinal direction of the waveguide, The power supply means, A dielectric for feeding the power source, the dielectric being consistent with the inner width and height of the waveguide; A metal pattern for signal transmission applied to one surface of the dielectric for power supply for signal transmission; A grounding metal conductor applied to the other surface of the dielectric for feeding and grounded; An inner core of the coaxial cable connected to the signal transmission metal pattern to transfer energy to the upper ridge and inserted into the waveguide in a direction perpendicular to the length direction of the waveguide; A dielectric of the coaxial cable for shielding the inner core of the coaxial cable and the outer core of the coaxial cable; And First and second via holes existing between the signal transmission metal pattern and the ground metal conductor to allow current to flow between the signal transmission metal pattern and the ground metal conductor. Double ridge waveguide transition apparatus comprising a. wave-guide; Upper and lower ridges respectively inserted into upper and lower centers of the inside of the waveguide; Feeding means inserted into the waveguide in a direction perpendicular to the longitudinal direction of the waveguide, The power supply means, A first dielectric having one side connected to the first metal conductor in the direction of the opening face of the waveguide and the other side connected to the second metal conductor in the shorted longitudinal section direction of the waveguide; A second dielectric having one side connected to the second metal conductor in an opening surface direction of the waveguide and the other side connected to a first ground metal conductor in a shorted longitudinal section direction of the waveguide; It is coated on the first dielectric material and is connected to the inner core of the coaxial cable, and is not directly connected to the lower surface of the waveguide and the lower ridge, but is connected to the upper ridge and is connected to the upper and lateral edges and the lower edge of the waveguide. A first metal conductor having a '-' pattern along the line; The second metal conductor applied on the first and second dielectrics and having a pattern of a 'c' shape along an upper edge, a side edge, and a lower edge of the waveguide; A first grounding metal conductor on the second dielectric and connected to the waveguide; And First and second via holes electrically connecting the first metal conductor and the first ground metal conductor. Double ridge waveguide transition apparatus comprising a. The method of claim 3, wherein The first and second metal conductors, Broadband impedance matching of the double ridge waveguide transition device as its width is adjusted according to the thickness of the waveguides of the first and second dielectrics in the longitudinal direction and the size of the upper and lower ridges inside the waveguide. Double ridge waveguide transition apparatus, characterized in that the. The method of claim 2, The metal pattern for signal transmission, A double ridge waveguide connected to the upper ridge to transfer a signal received from the coaxial cable to the upper ridge or, conversely, a signal received from the upper ridge to the coaxial cable to be transferred to the outside of the waveguide. Transition device. The method of claim 2, The metal pattern for signal transmission, There is no mechanical junction to the lower ridge, but the double ridge waveguide transition apparatus, characterized in that it can be adjusted to the impedance of the waveguide by adjusting the distance between one and the lower ridge. The method of claim 2, The metal pattern for signal transmission, The double ridge waveguide transition apparatus having any one of an inverted trapezoid, a tapered shape, and a stepped shape for matching the impedance of the coaxial cable and the impedance of the waveguide. The method according to any one of claims 2 or 5 to 7, The first and second via holes, The double ridge waveguide transition apparatus of claim 1, wherein the double-ridge waveguide transition device is made of a bulk metal so that a current flows between the signal transmission metal pattern and the ground metal conductor. The method according to any one of claims 2 or 5 to 7, The first and second via holes, The double ridge waveguide transition apparatus, characterized in that the surface is coated with a metal so that a current flows between the signal transmission metal pattern and the ground metal conductor in a cylindrical shape. The method of claim 2 or 3, The upper and lower ridges, A double ridge waveguide transition apparatus comprising a conductor.

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