KR20220112571A - End-fed coaxial to waveguide adapter and antenna including the same - Google Patents

Abstract

A termination feed coaxial to waveguide adapter according to one embodiment of the present invention comprises: a waveguide; a loop disposed inside the waveguide; a coaxial connector disposed on a termination surface of the waveguide and connected to one end of the loop; and a cavity block disposed between one end of the loop and the coaxial connector and formed of a hollow cylinder, wherein the loop comprises a coupling part coupled to the coaxial connector inside the cavity block, a first line extending from the coupling part, and a second line connected to the first line in a vertical direction and coupled to a first surface of the waveguide, and a diameter of the second line is smaller than that of a diameter of the first line. Therefore, the present invention is capable of securing a stability of the adapter.

Description

END-FED COAXIAL TO WAVEGUIDE ADAPTER AND ANTENNA INCLUDING THE SAME

Embodiments of the present invention relate to a terminal feeding coaxial waveguide adapter and an antenna including the same, and more particularly, to a terminal feeding coaxial waveguide adapter employing an inverted L-shaped loop feeding method and an antenna including the same.

The waveguide is capable of high-power transmission, has a robust structure, and has low loss compared to a coaxial cable, so it is used in applications requiring high-output, low-loss power transmission. Usually, a coaxial cable that is easy to mount is used for the RF transmission line, and in order to transmit power to the waveguide, a coaxial to waveguide adapter having a transition structure between the waveguide and the coaxial cable is required.

The coaxial waveguide adapter generally has a structure in which a monopole-type probe is inserted in the direction of a wide surface of the waveguide. However, in the case of a waveguide and a waveguide array antenna or a horn antenna array mounted in a narrow space on the left and right, up and down, the terminal feeding structure of the waveguide must be applied.

The terminal quick-fix coaxial waveguide adapter uses an inverted L-shaped loop feeding method and a double ridge structure. The inverted L-shaped loop feeding method is used for general standard waveguides, and the double ridge feeding method is applied to ridge waveguides with a wide bandwidth. Since the double ridge structure requires impedance matching with a wide band, the length of the adapter increases as the ridge length increases. Such a coaxial waveguide adapter can be applied to a horn antenna and a double ridge horn antenna, and can be used as a waveguide antenna and a waveguide array antenna by adjusting the length of the adapter.

The inverted L-shaped loop feeding structure, which is the feeding structure of the terminal feeding coaxial waveguide adapter, has a lower impedance compared to the feeding structure using a monopole, so it is difficult to perform impedance matching with a reflection coefficient of -15dB or less, which can minimize the return loss within the standard waveguide bandwidth. . There is also a method of improving impedance matching by changing the vertical line of the inverted L-shaped loop feeding structure to an oblique line for impedance matching, but in this case, the length of the adapter is increased.

In addition, since the waveguide is used in high-power applications, it must be designed so that arcing does not occur in the inverted L-shaped loop feeding structure. need to be made

The present invention is to solve the above problems, to improve the coupling durability of the loop, to prevent arcing, and to provide a terminal-feed coaxial waveguide adapter and antenna that match the impedance with a reflection coefficient less than a set value.

However, these problems are exemplary, and the problems to be solved by the present invention are not limited thereto.

A terminal feed coaxial waveguide adapter according to an embodiment of the present invention comprises: a waveguide; a loop disposed within the waveguide; a coaxial connector disposed on a longitudinal section of the waveguide and connected to one end of the loop; and a cavity block disposed between one end of the loop and the coaxial connector and formed in a hollow cylindrical shape, wherein the loop includes: a coupling part coupled to the coaxial connector within the cavity block; a first line extending from the coupling part; and a second line connected to the first line in a vertical direction and coupled to a first surface of the waveguide, wherein a diameter of the second line is smaller than a diameter of the first line.

A line connecting portion connecting the first and second lines between the first line and the second line may be further included, and the line connecting portion may be formed to be round.

The cavity block may be formed to protrude from a longitudinal section of the waveguide toward the outside of the waveguide, and the coaxial connector may be coupled to the cavity block from the outside of the waveguide.

An end of the coupling portion may be tapered, and a recessed slot portion may be formed in a central portion of the end portion of the coupling portion, and an inner core of the coaxial connector protruding from the coaxial connector may be fitted into the slot portion.

A slit portion may be formed in a central end portion of the inner core of the coaxial connector, and when the inner core of the coaxial connector is inserted into the slot portion, the slit portion is retracted and the inner core of the coaxial connector may be inserted into the slot portion.

A threaded portion is formed on both ends of the inner core of the coaxial connector, a screw valley is formed on an inner wall of the slot portion, and the inner core of the coaxial connector and the slot portion may be screw-coupled.

A conductive adhesive layer may be formed between the inner core portion of the coaxial connector and the slot portion, and the conductive adhesive layer may bond the inner core portion of the coaxial connector and the slot portion.

The waveguide may include: a first surface that perpendicularly meets a longitudinal cross-section of the waveguide and is connected to the loop; and a second surface facing the first surface, wherein the coaxial connector and the cavity block connected to the coaxial connector may be disposed closer to the first surface than the second surface.

An inner diameter of the cavity block may be formed to correspond to an outer diameter of the coaxial connector.

An antenna according to another embodiment of the present invention includes the terminal feed coaxial waveguide adapter.

Other aspects, features, and advantages other than those described above will become apparent from the following detailed description, claims and drawings for carrying out the invention.

The terminal-feeding coaxial waveguide adapter and the antenna including the same according to an embodiment of the present invention reduce the maximum electric field through a line connection structure formed to be round, thereby reducing arcing that may occur when high power is input.

In addition, the terminal feeding coaxial waveguide adapter and the antenna including the same according to an embodiment of the present invention are formed in a hollow cylindrical shape and a cavity block disposed between the coaxial connector and the loop is applied, and the length of the adapter is not increased in the vertical direction. By adjusting the diameter of the second line formed by the , it is possible to improve the impedance matching of the adapter. In addition, when applied as a radiation element of a waveguide array antenna, it is possible to improve the reduction in active reflection coefficient occurring in a specific band.

In addition, the terminal feeding coaxial waveguide adapter and the antenna including the same according to an embodiment of the present invention secure the stability of the adapter from vibration and shock through a solid coupling structure between the inverted L-shaped loop feeding structure and the inner core of the coaxial connector. .

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of a terminal feed coaxial waveguide adapter according to an embodiment of the present invention. Figure 1 (a) is a perspective view of one side, Figure 1 (b) is a perspective view of the other side.
FIG. 2 is a cross-sectional perspective view of a terminal feeding coaxial waveguide adapter according to an embodiment of the present invention, taken along a portion AA′ of FIG. 1 .
3 is an enlarged view of a portion B of FIG. 2 , in which a cavity block according to an embodiment of the present invention is mounted.
4 is a diagram illustrating a loop according to an embodiment of the present invention. Fig. 4(a) is a perspective view, and Fig. 4(b) is a side view.
FIG. 5 is a view showing a coupling structure between a loop and a coaxial connector according to an embodiment of the present invention, taken along line AA′ of FIG. 1 .
6 is a view showing a coupling structure between a loop and a coaxial connector according to another embodiment of the present invention, taken along line AA′ of FIG. 1 .
7 is a view showing a coupling structure between a loop and a coaxial connector according to another embodiment of the present invention, taken along line AA′ of FIG. 1 .
8 is a graph showing the reflection coefficient according to the frequency of the waveguide adapter according to the structure of the loop and the presence or absence of the cavity block. (a) is a waveguide adapter including a basic loop structure, (b) is a waveguide adapter further including a cavity block in (a), (c) is the diameter of the second line according to an embodiment of the present invention is the first It is a waveguide adapter that is smaller than the diameter of the line, the line connection part is formed to be round, and further includes a cavity block.
9 is a graph showing an active reflection coefficient according to a frequency of a waveguide adapter according to a structure of a loop applied to a finite array antenna. (a) is a waveguide adapter including a cavity block in a basic loop structure, (b) is a diameter of the second line according to an embodiment of the present invention is smaller than the diameter of the first line, the line connection part is formed to be round, It is a waveguide adapter further comprising a cavity block.
10 is a graph showing the maximum electric field according to the frequency of the waveguide adapter according to the structure of the loop. (a) is a waveguide adapter including a cavity block in a basic loop structure, (b) is a diameter of the second line according to an embodiment of the present invention is smaller than the diameter of the first line, the line connection part is formed to be round, It is a waveguide adapter further comprising a cavity block.
11 is a view illustrating a reflection coefficient shown by a simulation of a waveguide antenna according to an embodiment of the present invention and a reflection coefficient according to a measurement value compared thereto.
12 is a diagram illustrating a measured reflection pattern of a waveguide antenna according to an embodiment of the present invention. FIG. 12(a) is a diagram illustrating a radiation pattern in the E-plane, and FIG. 12(b) is a radiation pattern in the H-plane.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the description of the invention. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In the description of the present invention, even though shown in other embodiments, the same identification numbers are used for the same components.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when described with reference to the drawings, the same or corresponding components are given the same reference numerals, and the overlapping description thereof will be omitted. .

In the following embodiments, terms such as first, second, etc. are used for the purpose of distinguishing one component from another, not in a limiting sense.

In the following examples, the singular expression includes the plural expression unless the context clearly dictates otherwise.

In the following embodiments, terms such as include or have means that the features or components described in the specification are present, and the possibility that one or more other features or components may be added is not excluded in advance.

In the drawings, the size of the components may be exaggerated or reduced for convenience of description. For example, since the size and thickness of each component shown in the drawings are arbitrarily indicated for convenience of description, the present invention is not necessarily limited to the illustrated bar.

In the following embodiments, the x-axis, the y-axis, and the z-axis are not limited to three axes on the Cartesian coordinate system, and may be interpreted in a broad sense including them. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but may refer to different directions that are not orthogonal to each other.

In cases where certain embodiments are otherwise practicable, a specific process sequence may be performed different from the described sequence. For example, two processes described in succession may be performed substantially simultaneously, or may be performed in an order opposite to the order described.

The terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

For reference, unless specifically limited in this specification, the traveling direction may correspond to the X-axis direction, the width direction to the Y-axis direction, and the height direction to the Z-axis direction, respectively.

Hereinafter, a structure of a terminal feeding coaxial waveguide adapter according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4 .

1 is a perspective view of a terminal feed coaxial waveguide adapter according to an embodiment of the present invention. Figure 1 (a) is a perspective view of one side, Figure 1 (b) is a perspective view of the other side. Figure 2 is a section A-A' of Figure 1, a cross-sectional perspective view of the terminal feed coaxial waveguide adapter according to an embodiment of the present invention. 3 is an enlarged view of a portion B of FIG. 2 , in which a cavity block according to an embodiment of the present invention is mounted. 4 is a diagram illustrating a loop according to an embodiment of the present invention. Fig. 4(a) is a perspective view, and Fig. 4(b) is a side view.

1 to 4 , the terminal feeding coaxial waveguide adapter and antenna according to an embodiment of the present invention includes a waveguide 100 , a loop 200 disposed inside the waveguide 100 , and one surface of the waveguide 100 . It is disposed in and is disposed between the coaxial connector 400 connected to one end of the loop 200 and the one end of the loop 200 and the coaxial connector 400, and includes a cavity block 300 including a cylindrical hollow portion.

In this case, power may be supplied to the rear surface portion 100a of the waveguide using the coaxial connector 400 at the end of the waveguide 100 .

The cavity block 300 may be formed as a hollow cylindrical body. The cavity block 300 may be formed to protrude from the longitudinal cross-section 100a of the waveguide 100 to the outside of the waveguide 100 . The coaxial connector 400 may be coupled to the outer surface of the cavity block 300 from the outside of the waveguide 100 . The inside of the cavity block 300 may be formed in a hollow cylindrical structure to correspond to the outer diameter of the coaxial connector 400 . The outside of the cavity block 300 may be formed in a tetrahedral structure to facilitate coupling with the coaxial connector.

A coupling portion formed at an end of the loop 200 may be positioned inside the hollow cavity block 300 . The coupling portion of the loop 200 may be coupled to the inner core 410 of the coaxial connector protruding from the coaxial connector 400 illustrated in FIG. 3 . In this case, the coupling portion of the loop 200 and the inner core 410 of the coaxial connector may be coupled in the hollow portion of the cavity block 300 .

At this time, the coaxial connector 400 and the cavity block 300 connected to the coaxial connector 400 are disposed closer to the first surface 100b than to the second surface 100c facing the first surface 100b. can This is to convert the TEM (Transverse Electromagnetic) mode of the coaxial transmission line to the TE (Transverse Electric)10 mode.

Through the hollow structure and arrangement position of the cavity block 300 , it may serve to increase the impedance of the inverted L-shaped loop feeding structure having a low input impedance.

The loop 200 may have an inverted L-shaped structure. One end of the loop 200 formed in an inverted L-shape is coupled to the coaxial connector 400 through the cavity block 300 in the longitudinal cross-section 100a of the waveguide 100 , and the other end of the loop 200 is the waveguide 100 . It may be connected to the first surface 100b of the waveguide that is perpendicular to the longitudinal cross-section 100a.

4 shows a loop structure according to an embodiment of the present invention. The loop 200 is perpendicular to the coupling part 210 coupled to the coaxial connector 400 inside the cavity block 300 , the first line 220 extending from the coupling part 210 , and the first line 220 . and a second line 240 connected in the direction and coupled to the first surface 100b of the waveguide 100 . In this case, the diameter of the second line 240 is smaller than the diameter of the first line 220 .

The coupling part 210 may be coupled to the inner core 410 of the coaxial connector 400 in the cavity block 300 . The coupling portion 210 may be formed in a tapered shape toward the direction in which the coaxial connector 400 is located.

The first line 220 and the second line 240 may be formed in a pipe shape. A line connection unit 230 for connecting the first and second lines 220 and 240 may be formed between the first line 220 and the second line 240 . According to the present embodiment, the line connection part 230 may be formed to be round. Through this, it is possible to prevent arcing when high power is input in preparation for a case in which two lines are connected at right angles.

According to the present embodiment, the diameter of the second line 240 may be smaller than the diameter of the first line 220 . By making the diameter of the second line 240 smaller than the diameter of the first line 220, the impedance of the waveguide adapter can be matched with a reflection coefficient of -15 dB or less.

Hereinafter, with reference to FIG. 5, the coupling structure between the loop of the terminal feeding coaxial waveguide adapter and the coaxial connector according to an embodiment of the present invention will be described in more detail. For content not disclosed in FIG. 5 , reference may be made to FIGS. 1 to 4 .

5 is a view showing a coupling structure between a loop and a coaxial connector according to an embodiment of the present invention, taken along line A-A' of FIG. 1 .

Referring to FIG. 5 , in the terminal feed waveguide adapter according to an embodiment of the present invention, the end of the coupling part 210 of the loop 200 may be formed in a tapered shape. At this time, a recessed slot portion 211 is formed in the center of the end portion of the coupling portion 210 , and the coaxial connector inner core 410 protruding from the coaxial connector 400 may be fitted into the slot portion 211 . .

However, the coupling between the inner core portion 410 of the coaxial connector and the coupling portion 210 of the loop 200 may be released by external shock and vibration. Accordingly, according to the present embodiment, a slit portion 411 is formed in the middle portion of the end of the inner core portion of the coaxial connector 410 , and the inner core portion 410 of the coaxial connector is inserted into the slot portion 211 when the slit portion 411 is coupled. ) is retracted, the coaxial connector inner core 410 may be inserted into the slot portion 211 .

Through this, the constricted slit part 411 may be fixed while pushing the inner wall of the coupling part 210 through an elastic force, and thus the coupling between the coupling part 210 and the inner core part of the coaxial connector 410 may be further strengthened.

Hereinafter, with reference to FIG. 6, a coupling structure between the loop of the terminal feeding coaxial waveguide adapter and the coaxial connector according to another embodiment of the present invention will be described in more detail. For content not disclosed in FIG. 6 , reference may be made to FIGS. 1 to 4 .

6 is a view showing a coupling structure between a loop and a coaxial connector according to another embodiment of the present invention, taken along line A-A' of FIG. 1 .

Referring to FIG. 6 , in the terminal feed coaxial waveguide adapter according to an embodiment of the present invention, thread portions 412 are formed on both ends of the inner core portion 410 of the coaxial connector, and the inner wall of the slot portion 211 has The screw bone portion (211a) is formed, the coaxial connector inner core portion 410 and the slot portion 211 may be screw-coupled.

Since the coupling portion 210 and the inner core of the coaxial connector 410 are screwed together, the coupling between the coupling portion 210 and the inner core of the coaxial connector 410 may be further strengthened.

Hereinafter, with reference to FIG. 7, the coupling structure between the loop of the terminal feeding coaxial waveguide adapter and the coaxial connector according to another embodiment of the present invention will be described in more detail. For content not disclosed in FIG. 7 , reference may be made to FIGS. 1 to 4 .

7 is a view showing a coupling structure between a loop and a coaxial connector according to another embodiment of the present invention, taken along line A-A' of FIG. 1 .

Referring to FIG. 7 , in the terminal feeding coaxial waveguide adapter according to an embodiment of the present invention, a conductive adhesive layer 413 is formed between the inner core 410 and the slot 211 of the coaxial connector, and the conductive adhesive layer is the coaxial connector. The inner core portion 410 and the slot portion 211 may be adhered to each other and power may be supplied at the same time. In an embodiment, the conductive adhesive layer 413 may include conductive epoxy.

Hereinafter, with reference to FIGS. 8 to 12, the effect through the structure of the terminal feeding coaxial waveguide adapter according to an embodiment of the present invention will be described. For content not disclosed in FIGS. 8 to 12 , reference may be made to FIGS. 1 to 7 .

8 is a graph showing the reflection coefficient according to the frequency of the waveguide adapter according to the structure of the loop and the presence or absence of the cavity block. (a) is a waveguide adapter including a basic loop structure, (b) is a waveguide adapter further including a cavity block in (a), (c) is the diameter of the second line according to an embodiment of the present invention is the first It is a waveguide adapter that is smaller than the diameter of the line, the line connection part is formed to be round, and further includes a cavity block.

8 shows a reflection coefficient simulation result according to the cavity block 300 and the inverted L-shaped loop feeding structure in order to confirm the improvement of the input impedance matching of the waveguide adapter according to an embodiment of the present invention. In case of structure (a), it is a basic inverted L-shaped loop feeding structure, and the two lines have the same diameter. It can be difficult.

In the case of (b) structure, it is a structure in which a cavity block is applied to increase input impedance compared to (a) structure. It can be seen that a reflection coefficient of less than -15 dB to be obtained cannot be obtained.

In the case of the structure (c), as a loop coupling structure according to an embodiment of the present invention, the diameter of the second line 240 is smaller than that of the first line 220 compared to the structure (b) to increase the input impedance in the graph. It can be seen that the reflection coefficient is improved to -15dB or less, which can be used as a waveguide adapter. In addition, this structure can improve the characteristic that the active reflection coefficient is deteriorated in some bands when the waveguide array antenna is applied.

9 is a graph showing an active reflection coefficient according to a frequency of a waveguide adapter according to a structure of a loop applied to a finite array antenna. (a) is a waveguide adapter including a cavity block in a basic loop structure, (b) is a diameter of the second line according to an embodiment of the present invention is smaller than the diameter of the first line, and the line connection part is formed to be round, It is a waveguide adapter further comprising a cavity block.

FIG. 9 discloses a simulation of an improved active reflection coefficient characteristic when the waveguide antenna according to an embodiment of the present invention is applied to the waveguide array antenna. The structure (a) is a structure in which a cavity block is applied to a basic inverted L-shaped loop feeding structure, and it can be seen that the active reflection coefficient characteristic is deteriorated in the 1.2GHz band.

In the case of the structure (b), it can be seen that the active reflection coefficient is improved to -10 dB or less in the 1.2 GHz band as a loop coupling structure according to an embodiment of the present invention.

10 is a graph showing the maximum electric field according to the frequency of the waveguide adapter according to the structure of the loop. (a) is a waveguide adapter including a cavity block in a basic loop structure, (b) is a diameter of the second line according to an embodiment of the present invention is smaller than the diameter of the first line, and the line connection part is formed to be round, It is a waveguide adapter further comprising a cavity block.

10 is a graph simulating the maximum electric field according to the line structure of the inverted L-shaped loop feeding structure is disclosed. (a) is a structure in which the line connecting portions of the first and second lines are formed at right angles, and (b) is a structure in which the line connecting portion 230 according to an embodiment of the present invention is formed to be round.

In the case of (a) structure, the average maximum electric field on the graph is about 91590 V/m, and (b) structure according to an embodiment of the present invention is 56160 V/m. It can be seen that the probability of this occurrence is relatively small.

11 is a diagram illustrating a reflection coefficient shown by a simulation of a waveguide antenna according to an embodiment of the present invention and a reflection coefficient according to a measurement value compared thereto.

FIG. 11 shows graphs of simulated and measured values of a waveguide antenna when the end of the waveguide adapter is opened and the length of the waveguide is adjusted to be used as a waveguide antenna. Looking at the graph, it can be seen that the simulation and the actual measured values are mostly identical, and it can be confirmed that the reflection coefficient is -10dB or less, and the input impedance is well matched, so that it can be applied as a waveguide antenna.

12 is a diagram illustrating a measured reflection pattern of a waveguide antenna according to an embodiment of the present invention. FIG. 12(a) is a diagram showing a radiation pattern in the E-plane, and FIG. 12(b) is a radiation pattern in the H-plane.

12 is a graph showing the return loss characteristics measured through the waveguide adapter structure according to an embodiment of the present invention. It can be seen that the E-plane exhibits a wider beamwidth characteristic than the H-plane due to the TE10 mode of the waveguide. have. Through this, it can be confirmed that the waveguide adapter structure according to an embodiment of the present invention can also be applied to a waveguide antenna.

As described above, the present invention has been described with reference to the embodiment shown in the drawings, but this is only an example. Those of ordinary skill in the art can fully understand that various modifications and equivalent other embodiments are possible from the embodiments. Therefore, the true technical protection scope of the present invention should be determined based on the appended claims.

Specific technical content described in the embodiment is an embodiment and does not limit the technical scope of the embodiment. In order to concisely and clearly describe the description of the invention, descriptions of conventional general techniques and configurations may be omitted.

In addition, the connection or connection member of the lines between the components shown in the drawings exemplarily shows functional connections and/or physical or circuit connections, and in an actual device, various functional connections, physical connections that are replaceable or additional It may be expressed as a connection, or circuit connections. In addition, unless there is a specific reference such as "essential" or "importantly", it may not be a necessary component for the application of the present invention.

In the description and claims, "above" or similar referents may refer to both the singular and the plural unless otherwise specified. In addition, when a range is described in the examples, it includes the invention to which individual values within the range are applied (if there is no description to the contrary), and each individual value constituting the range is described in the description of the invention. same. In addition, the steps constituting the method according to the embodiment may be performed in an appropriate order unless the order is explicitly stated or there is no description to the contrary.

The embodiments are not necessarily limited according to the order of description of the steps. The use of all examples or exemplary terminology (eg, etc.) in the embodiments is merely for describing the embodiments in detail, and unless limited by the claims, the scope of the embodiments is limited by the examples or illustrative terms. it is not In addition, those skilled in the art will appreciate that various modifications, combinations, and changes may be made in accordance with design conditions and factors within the scope of the appended claims or their equivalents.

100: waveguide
100a: waveguide longitudinal section
100b: first side of the waveguide
100c: second side of the waveguide
200: loop
210: coupling part
211: slot unit
211a: screw bone part
220: first line
230: line connection part
240: second line
300: cavity block
400: coaxial connector
410: coaxial connector inner core
411: slit part
412: thread part

Claims (10)

wave-guide;
a loop disposed within the waveguide;
a coaxial connector disposed on a longitudinal section of the waveguide and connected to one end of the loop; and
and a cavity block disposed between one end of the loop and the coaxial connector and formed in a hollow cylindrical shape,
The loop is
a coupling part coupled to the coaxial connector in the cavity block;
a first line extending from the coupling part; and
and a second line connected to the first line in a vertical direction and coupled to the first surface of the waveguide,
The diameter of the second line is smaller than the diameter of the first line, the terminal feeding coaxial waveguide adapter. The method of claim 1,
Further comprising a line connecting portion connecting the first and second lines between the first line and the second line,
The line connection portion is formed to be rounded to a terminal feed coaxial waveguide adapter. The method of claim 1,
The cavity block is formed to protrude from the longitudinal cross-section of the waveguide toward the outside of the waveguide,
The coaxial connector is a terminal feed coaxial waveguide adapter coupled to the cavity block from the outside of the waveguide. The method of claim 1,
The end of the coupling part is formed in a tapered shape,
A recessed slot portion is formed in the center of the end of the coupling portion,
The coaxial connector inner core protruding from the coaxial connector is a terminal feed coaxial waveguide adapter that is fitted into the slot portion. 5. The method of claim 4,
A slit portion is formed in the middle portion of the end of the inner core of the coaxial connector,
When the coaxial connector inner core portion is inserted into the slot portion, the slit portion is retracted and the coaxial connector inner portion is inserted into the slot portion. 5. The method of claim 4,
Threaded portions are formed on both ends of the inner core of the coaxial connector,
A screw bone part is formed on the inner wall of the slot part,
The coaxial connector inner core portion and the slot portion are screw-coupled to the terminal feed coaxial waveguide adapter. 5. The method of claim 4,
A conductive adhesive layer is formed between the inner core of the coaxial connector and the slot portion,
The conductive adhesive layer is a terminal feed coaxial waveguide adapter for bonding the inner core portion of the coaxial connector and the slot portion. The method of claim 1,
The waveguide is
a first face perpendicular to the waveguide end face and connected to the loop; and
and a second surface facing the first surface,
The coaxial connector and the cavity block connected to the coaxial connector are disposed closer to the first surface than to the second surface. The method of claim 1,
An inner diameter of the cavity block is formed to correspond to an outer diameter of the coaxial connector. Antenna comprising a terminal feed coaxial waveguide adapter according to any one of claims 1 to 9.

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