Patent Application
20230187803
The present invention relates to a waveguide connection structure, a determination method thereof, a manufacturing method thereof, and a waveguide switch using the same.
In order to cope with mobile traffic, which is expected to further increase in the future, there is a strong demand for the use of millimeter wave and terahertz wave bands for wireless communication, which are capable of achieving transmission speeds on the order of several tens of Gbps, and for example, the use of 252 to 325 GHz is considered in IEEE802.15.3d.
For example, a rectangular waveguide with inner dimensions of 0.864 mm × 0.432 mm is used as a propagation path for propagating electromagnetic waves in the WR-3 band (220 to 325 GHz). As a choke flange for coupling such rectangular waveguides, a choke flange having a structure in which a rectangular choke groove is formed in order to prevent leakage of electromagnetic waves from the waveguide opening is known (for example, See Patent Document 1).
[Patent Document 1] Japanese Patent No. 6185455
According to the simulation result of
However, in the choke flange in the related art as shown in
The present invention has been made in order to solve such problems in the related art, and an object of the present invention is to provide a waveguide connection structure, a determination method thereof, a manufacturing method thereof, and a waveguide switch using the same which are capable of effectively suppressing the leakage of electromagnetic waves from a connection point of two facing waveguides.
In order to solve the above-described problems, a waveguide connection structure according to the present invention is a waveguide connection structure including two waveguides having end faces each of which is formed with at least one waveguide path, the end faces face each other in parallel with a predetermined gap, in which a choke groove having a depth corresponding to ¼ of a guide wavelength corresponding to a leakage prevention target frequency is provided at the end face of at least one of the two waveguides, in a band-shaped region surrounding an opening of a rectangle of the at least one waveguide path, the band-shaped region is a region whose center is a center of the rectangle, and which is bounded by an inner ellipse and an outer ellipse whose major axis direction is parallel to a longer side of the rectangle, a minor radius of the inner ellipse corresponds to ¼ of the guide wavelength, a minor radius of the outer ellipse is longer than the minor radius of the inner ellipse by a length corresponding to ¼ of the guide wavelength, and the choke groove includes two groove portions that are in contact with the inner ellipse and the outer ellipse and are located on the longer side of the rectangle, in the band-shaped region.
In other words, the waveguide connection structure according to the present invention is a structure in which a choke groove of a shape that covers a region having a strong electric field of an electromagnetic wave leaking into a predetermined gap between two waveguides is formed on the end face of at least one of the two waveguides. With this configuration, the waveguide connection structure according to the present embodiment can effectively suppress the leakage of electromagnetic waves from a connection point of two facing waveguides.
Further, in the waveguide connection structure according to the present invention, the choke groove further includes two groove portions that are in contact with the inner ellipse and the outer ellipse and are located on the shorter side of the rectangle, in the band-shaped region, and the four groove portions may be separated from each other by four non-groove portions along the diagonal direction of the rectangle within the band-shaped region.
With this configuration, the waveguide connection structure according to the present invention can suppress the leakage of electromagnetic waves to less than -25 dB, over the entire operating frequency range of a WR-3 waveguide (fractional bandwidth of about 40%), for example, with respect to a predetermined gap up to about ⅒ wavelength of the guide wavelength.
Further, a determination method of a waveguide connection structure according to the present invention is a determination method of a waveguide connection structure in which end faces of two waveguides respectively formed with at least one waveguide path face each other in parallel with a predetermined gap, a choke groove having a depth corresponding to ¼ of a guide wavelength corresponding to a leakage prevention target frequency is provided at the end face of at least one of the two waveguides, in a band-shaped region surrounding an opening of a rectangle of the at least one waveguide path, the band-shaped region is a region whose center is a center of the rectangle, and which is bounded by an inner ellipse and an outer ellipse whose major axis direction is parallel to a longer side of the rectangle, a minor radius of the inner ellipse corresponds to ¼ of the guide wavelength, a minor radius of the outer ellipse is longer than the minor radius of the inner ellipse by a length corresponding to ¼ of the guide wavelength, and the choke groove includes two groove portions that are in contact with the inner ellipse and the outer ellipse and are located on the longer side of the rectangle, in the band-shaped region, the determination method including: an electromagnetic field analysis step of, by using, as an analysis model, an analysis waveguide connection structure in which end faces of two analysis waveguides, which respectively have waveguide paths of the same shape as the waveguide paths and are not formed with choke grooves, face each other in parallel with a predetermined gap, when an electromagnetic wave of the leakage prevention target frequency propagates from one to the other of the two analysis waveguides which are not formed with the choke grooves, acquiring a shape of an equiphase surface of electromagnetic waves leaking from the predetermined gap by electromagnetic field analysis; an ellipse shape acquisition step of acquiring a minor radius and a major radius of an equiphase surface separated by a distance corresponding to ¼ of the guide wavelength in a direction perpendicular to the longer side of the rectangle from the center of the rectangle, among the equiphase surfaces acquired in the electromagnetic field analysis step; an inner ellipse shape determination step of determining the minor radius and the major radius of the equiphase surface acquired in the ellipse shape acquisition step as the minor radius and a major radius of the inner ellipse; and an outer ellipse shape determination step of determining values obtained by respectively adding a distance corresponding to ¼ of the guide wavelength to the minor radius and the major radius of the inner ellipse determined in the inner ellipse shape determination step as the minor radius and a major radius of the outer ellipse.
With this configuration, in the determination method of a waveguide connection structure according to the present invention, the shape of the equiphase surface of the electromagnetic waves of the leakage prevention target frequency propagating from one to the other of the two analysis waveguides is acquired by electromagnetic field analysis, so that it is possible to determine the range of the band-shaped region R on the end face of at least one of the two waveguides.
Further, a manufacturing method of a waveguide connection structure according to the present invention is a manufacturing method of a waveguide connection structure in which end faces of two waveguides respectively formed with at least one waveguide path face each other in parallel with a predetermined gap, a choke groove having a depth corresponding to ¼ of a guide wavelength corresponding to a leakage prevention target frequency is provided at the end face of at least one of the two waveguides, in a band-shaped region surrounding an opening of a rectangle of the at least one waveguide path, the band-shaped region is a region whose center is a center of the rectangle, and which is bounded by an inner ellipse and an outer ellipse whose major axis direction is parallel to a longer side of the rectangle, a minor radius of the inner ellipse corresponds to ¼ of the guide wavelength, a minor radius of the outer ellipse is longer than the minor radius of the inner ellipse by a length corresponding to ¼ of the guide wavelength, and the choke groove includes two groove portions that are in contact with the inner ellipse and the outer ellipse and are located on the longer side of the rectangle, in the band-shaped region, the manufacturing method including: an electromagnetic field analysis step of, by using, as an analysis model, an analysis waveguide connection structure in which end faces of two analysis waveguides, which respectively have waveguide paths of the same shape as the waveguide paths and are not formed with choke grooves, face each other in parallel with a predetermined gap, when an electromagnetic wave of the leakage prevention target frequency propagates from one to the other of the two analysis waveguides which are not formed with the choke grooves, acquiring a shape of an equiphase surface of electromagnetic waves leaking from the predetermined gap by electromagnetic field analysis; an ellipse shape acquisition step of acquiring a minor radius and a major radius of an equiphase surface separated by a distance corresponding to ¼ of the guide wavelength in a direction perpendicular to the longer side of the rectangle from the center of the rectangle, among the equiphase surfaces acquired in the electromagnetic field analysis step; an inner ellipse shape determination step of determining the minor radius and the major radius of the equiphase surface acquired in the ellipse shape acquisition step as the minor radius and a major radius of the inner ellipse; an outer ellipse shape determination step of determining values obtained by respectively adding a distance corresponding to ¼ of the guide wavelength to the minor radius and the major radius of the inner ellipse determined in the inner ellipse shape determination step as the minor radius and a major radius of the outer ellipse; a choke groove formation step of forming the choke groove in the band-shaped region defined by the minor radii and the major radii of the inner ellipse and the outer ellipse determined in the inner ellipse shape determination step and the outer ellipse shape determination step; and a waveguide arrangement step of arranging the two waveguides such that the end faces of the two waveguides face each other in parallel with the predetermined gap.
That is, in the manufacturing method of the waveguide connection structure according to the present embodiment, the choke groove is formed in the band-shaped region of the end face of at least one of the two waveguides determined by the above determination method, and the two waveguides are disposed such that the end faces of the two waveguides face each other in parallel with the predetermined gap therebetween. With this configuration, the manufacturing method of a waveguide connection structure according to the present embodiment can manufacture the waveguide connection structure capable of effectively suppressing the leakage of electromagnetic waves from a connection point of two facing waveguides.
Further, a waveguide switch according to the present invention includes a base portion; a first fixed waveguide block which is fixed to the base portion, and in which at least one waveguide path surrounded by a metal wall is formed so as to penetrate from a first end face to a second end face; a second fixed waveguide block which is fixed to the base portion and has a third end face parallel to the second end face of the first fixed waveguide block, and in which at least one waveguide path surrounded by a metal wall is formed so as to penetrate from the third end face to a fourth end face; a movable waveguide block which has a fifth end face facing the second end face of the first fixed waveguide block with a predetermined gap in parallel and a sixth end face facing the third end face of the second fixed waveguide block with a predetermined gap in parallel, in which a plurality of waveguide paths surrounded by metal walls are formed penetrating from the fifth end face to the sixth end face, and which is supported by the base portion so as to be slidable parallel to the second end face of the first fixed waveguide block and the third end face of the second fixed waveguide block; and a driving device that is provided on the base portion and slides the movable waveguide block, in which the movable waveguide block is slid with respect to the first fixed waveguide block and the second fixed waveguide block, and any one of the plurality of waveguide paths of the movable waveguide block is selectively connected to between any one of the at least one waveguide path of the first fixed waveguide block and any one of the at least one waveguide path of the second fixed waveguide block, in different plurality of positions, a choke groove having a depth corresponding to ¼ of a guide wavelength corresponding to a leakage prevention target frequency is provided, in a band-shaped region surrounding at least one opening among an opening of the at least one waveguide path on a second end face side of the first fixed waveguide block, an opening of the at least one waveguide path on a third end face side of the second fixed waveguide block, and openings of the plurality of waveguide paths on a fifth end face side and a sixth end face side of the movable waveguide block, and the band-shaped region is a region whose center is a center of a rectangle, and which is bounded by an inner ellipse and an outer ellipse whose major axis direction is parallel to a longer side of the rectangle, a minor radius of the inner ellipse corresponds to ¼ of the guide wavelength, a minor radius of the outer ellipse is longer than the minor radius of the inner ellipse by a length corresponding to ¼ of the guide wavelength, and the choke groove includes two groove portions that are in contact with the inner ellipse and the outer ellipse and are located on the longer side of the rectangle, in the band-shaped region.
With this configuration, the waveguide switch according to the present invention uses the above-described waveguide connection structure for the movable portion (movable waveguide block), thereby improving the return loss and insertion loss of the switch over a wide band, and can suppress the unintended leakage of electromagnetic waves in the gap between the first fixed waveguide block and the movable waveguide block and the gap between the second fixed waveguide block and the movable waveguide block.
Further, the waveguide switch according to the present invention uses the above-described waveguide connection structure for the movable waveguide block, so that the gap between the first fixed waveguide block and the movable waveguide block and the gap between the second fixed waveguide block and the movable waveguide block can be made wider than before, and the machining accuracy is relaxed and the resistance to aging is improved.
The present invention provides a waveguide connection structure, a determination method thereof, a manufacturing method thereof, and a waveguide switch using the same which are capable of effectively suppressing the leakage of electromagnetic waves from a connection point of two facing waveguides.
Embodiments of a waveguide connection structure, a determination method thereof, a manufacturing method thereof, and a waveguide switch using the same according to the present invention will be described below with reference to the drawings.
As shown in
In either one or both of the end face 10b of the waveguide 10 and the end face 20a of the waveguide 20, in the band-shaped region R surrounding the opening of the rectangle of the waveguide path 21, a choke groove 25 is provided to prevent leakage of electromagnetic waves from the gap g between the end faces 10b and 20a. The choke groove 25 provided in the end face 20a of the waveguide 20 will be mainly described later. The band-shaped region R is a region bounded by an inner ellipse e1 and an outer ellipse e2 whose major axis direction is parallel to the longer side of the opening of the rectangle of the waveguide path 21, as indicated by oblique lines in
The inner wall surfaces of the groove portions 25a to 25d forming the choke groove 25 are perpendicular to the end face 20a. Further, the depth of the groove portions 25a to 25d corresponds to ¼ of the guide wavelength λg corresponding to the leakage prevention target frequency. In the present embodiment, the leakage prevention target frequency is 272.5 GHz, which is the center frequency of the WR-3 band (220 to 325 GHz). In this case, the guide wavelength λg is approximately 1.43 mm. Here, the depth corresponding to ¼ of the guide wavelength λg refers to a depth within a range of ±20% of ¼ of the guide wavelength λg. In addition, the leakage prevention target frequency is not limited to the above values, and may be any frequency within the WR-3 band or other desired frequency band according to the sizes of the waveguide 10 and the waveguide 20.
The minor radius rs1 of the inner ellipse e1 has a length corresponding to ¼ of the guide wavelength λg. The minor radius rs2 of the outer ellipse e2 is longer than the minor radius rs1 of the inner ellipse e1 by a length corresponding to ¼ of the guide wavelength λg. Here, the length corresponding to ¼ of the guide wavelength λg refers to a length within a range of ±20% of ¼ of the guide wavelength λg.
The upper part of
The minor radius rs1 of the inner ellipse e1 is 0.4 mm, and is a distance corresponding to ¼ of the guide wavelength λg of the WR-3 band. The major radius of the inner ellipse e1 is 0.6 mm. The minor radius rs2 of the outer ellipse e2 is 0.76 (= 0.4 + λg/4) mm. The major radius of the outer ellipse e2 is 0.96 (= 0.6 + λg/4) mm. The angles formed by the extending directions of the four non-groove portions 27a, 27b, 27c, and 27d with respect to the major radii of the inner ellipse e1 and the outer ellipse e2 are all 26.5°. The width of the four non-groove portions 27a, 27b, 27c, and 27d is 0.1 mm. Each of the four groove portions 25a to 25d has a depth of 0.36 (=λg/4) mm. A gap g between the end faces 10b and 20a is 0.1 mm.
As shown in
Even when the port P1 side is the waveguide 20 and the port P2 side is the waveguide 10, the return loss S11 and the insertion loss S21 between the waveguide paths 11 and 21 do not change.
In the above simulation, the gap g between the end faces 10b and 20a is assumed to be 0.1 mm, but it has been confirmed that the return loss S11 in the frequency range including the WR-3 band can be suppressed to less than -15 dB, even with a gap g of 0.15 mm, which corresponds to about ⅒ wavelength of the guide wavelength λg (= 1.43 mm) at 272.5 GHz, which is the center frequency of the WR-3 band.
Compared to the configuration in which the choke groove is provided only on the end face 20a of the waveguide 20, in the configuration in which the choke grooves are provided both on the end face 10b of the waveguide 10 and the end face 20a of the waveguide 20, it is confirmed that in a wider frequency range, the return loss S11 can be suppressed to less than -15 dB, and the insertion loss S21 exhibits good values higher than -0.5 dB.
Hereinafter, an example of a determination method of a waveguide connection structure (steps S1 to S4 below) and a manufacturing method (steps S1 to S6 below) will be described with reference to
First, by using, as an analysis model, an analysis waveguide connection structure in which the end faces of two analysis waveguides, which respectively have waveguide paths of the same shape as the waveguide paths 11 and 21 of the two waveguides 10 and 20 and are not formed with choke grooves, face each other in parallel with a predetermined gap g, when an electromagnetic wave of a leakage prevention target frequency propagates from one to the other of the two analysis waveguides which are not formed with the choke grooves, the shapes of equiphase surfaces of the electromagnetic wave leaking from the predetermined gap g are acquired by electromagnetic field analysis (electromagnetic field analysis step S1). For example, the two analysis waveguides correspond to waveguides 80′ and 90′ shown in
Next, the minor radius and the major radius of an equiphase surface separated by a distance corresponding to ¼ of the guide wavelength λg in the direction perpendicular to the longer side of the rectangle from the center of the opening of the rectangle of the waveguide path 91′ of the waveguide 90′, among the equiphase surfaces acquired in the electromagnetic field analysis step S1 are acquired (ellipse shape acquisition step S2).
Next, the minor radius and the major radius of the equiphase surface acquired in the ellipse shape acquisition step S2 are determined as the minor radius and the major radius of the inner ellipse e1 (inner ellipse shape determination step S3).
Next, values obtained by respectively adding a distance corresponding to ¼ of the guide wavelength λg to the minor radius and the major radius of the inner ellipse e1 determined in the inner ellipse shape determination step S3 are determined as the minor radius and the major radius of the outer ellipse e2 (outer ellipse shape determination step S4) .
Next, the waveguide 20 is completed by forming the choke groove 25 in the band-shaped region R of the waveguide 90′ defined by the minor radii and the major radii of the inner ellipse e1 and the outer ellipse e2 determined in the inner ellipse shape determination step S3 and the outer ellipse shape determination step S4 (choke groove formation step S5).
Next, the two waveguides 10 and 20 are arranged such that the end face 10b of the waveguide 10 and the end face 20a of the waveguide 20 face each other in parallel with a predetermined gap g (waveguide arrangement step S6). This completes the waveguide connection structure.
The configuration of a waveguide switch 100 including the waveguide connection structure 1 according to the embodiment of the present invention will be described below. In general, a gap is required around a moving unit such as a waveguide switch, but there is a lower limit to the size of the allowable gap due to restrictions on machining accuracy. Further, the gap may be widened due to abrasion of the sliding unit of the mechanism that supports the moving unit. As the operating frequency (the shorter the wavelength) increases, the gap of the same size becomes substantially wider with respect to the wavelength, so that leakage of electromagnetic waves increases. The waveguide switch 100 of the present embodiment suppresses leakage of electromagnetic waves in such gaps around the moving unit.
As shown in
The base portion 31 is formed in a plate shape having a rectangular outer shape, the first fixed waveguide block 40 is fixed to one end side of the upper surface 31a of the base portion 31, and the second fixed waveguide block 50 is fixed to the other end side.
The first fixed waveguide block 40 is formed in a rectangular parallelepiped shape, and at least one (three in this example) waveguide paths 41, 42, and 43 having a predetermined diameter surrounded by metal walls are formed so as to penetrate from the first end face 40a to the second end face 40b on the opposite side. Here, the waveguide paths 41 to 43 are formed at the same height from the upper surface 31a of the base portion 31, in a direction perpendicular to the first end face 40a and the second end face 40b, in parallel with each other with a predetermined gap.
The diameters and heights of these waveguide paths 41 to 43 are the same as the waveguide path 51 of the second fixed waveguide block 50, which will be described later. The waveguide path 42 is formed on a line passing through the center of the waveguide path 51. The other two waveguide paths 41 and 43 are disposed such that the extension line passing through the center position of their openings sandwiches the extension line passing through the center position of the opening of the waveguide path 51 symmetrically.
On the other hand, the second fixed waveguide block 50 is formed in a rectangular parallelepiped shape having the same outer shape as the first fixed waveguide block 40, is fixed to the base portion 31 in a state of facing the third end face 50a in parallel with a predetermined distance therebetween, in the second end face 40b of the first fixed waveguide block 40, and at least one (one in this example) waveguide path 51 surrounded by a metal wall is formed so as to penetrate from the third end face 50a to the fourth end face 50b on the opposite side. The diameter and height of this waveguide path 51 are the same as those of the waveguide paths 41 to 43 of the first fixed waveguide block 40. Further, the waveguide path 51 is formed on a line passing through the center of the waveguide path 42 in a direction perpendicular to the third end face 50a and the fourth end face 50b.
The movable waveguide block 60 is supported so as to be slidable parallel to the second end face 40b and the third end face 50a, between the second end face 40b of the first fixed waveguide block 40 and the third end face 50a of the second fixed waveguide block 50, on the upper surface 31a of the base portion 31. The movable waveguide block 60 is formed in a rectangular parallelepiped shape having a length slightly shorter (for example, 200 µm) than the distance between the second end face 40b of the first fixed waveguide block 40 and the third end face 50a of the second fixed waveguide block 50 and approximately the same height as the first and second fixed waveguide blocks 40 and 50, and approximately the same height as the first and second fixed waveguide blocks 40 and 50, and a plurality of (in this example, three corresponding to the number of waveguide paths 41 to 43 formed in the first fixed waveguide block 40) waveguide paths 61, 62, and 63 surrounded by metal walls are formed to penetrate from the fifth end face 60a to the sixth end face 60b. Here, the fifth end face 60a faces the second end face 40b of the first fixed waveguide block 40 in parallel with a gap g (for example, g=100 µm), and the sixth end face 60b faces the third end face 50a of the second fixed waveguide block 50 in parallel with the gap g (for example, g=100 µm).
The diameters and heights of the waveguide paths 61 to 63 of the movable waveguide block 60 are the same as those of the waveguide paths 41 to 43 of the first fixed waveguide block 40 and the waveguide path 51 of the second fixed waveguide block 50. The waveguide path 62 is formed in a direction perpendicular to the fifth end face 60a and the sixth end face 60b. The other two waveguide paths 61 and 63 are formed obliquely with respect to the fifth end face 60a and the sixth end face 60b. These plurality of waveguide paths 61 to 63 surrounded by metal walls are provided with different passband characteristics within the millimeter wave band, by a known method such as arranging a resonance plate or a dielectric resonator inside.
In the position shown in
In the neutral position, the opening positions of the waveguide paths 61 to 63 on the side of the fifth end face 60a are spaced outward by L from the opening position of the waveguide path 42 of the first fixed waveguide block 40, and the opening positions of the waveguide paths 61 to 63 on the side of the sixth end face 60b are spaced apart by L on both sides from the opening position of the waveguide path 51 of the second fixed waveguide block 50.
Therefore, as shown in
Further, as shown in
In this manner, the movable waveguide block 60 slides with respect to the first fixed waveguide block 40 and the second fixed waveguide block 50, and any of the waveguide paths 61 to 63 is selectively connected to between any of the waveguide paths 41 to 43 of the first fixed waveguide block 40 and the waveguide path 51 of the second fixed waveguide block 50, in different positions (neutral position, first position, and second position).
This example has a symmetrical structure in which the waveguide path 51 of the second fixed waveguide block 50 is located on the extension line of the line passing through the center of the waveguide path 42 of the first fixed waveguide block 40, and at the neutral position, the three waveguide paths 61 to 63 of the movable waveguide block 60 are also line-symmetrical with respect to the extension line. On the other hand, an asymmetrical structure in which the waveguide path 51 of the second fixed waveguide block 50 is not on the extension line of the line passing through the center of the waveguide path 42 of the first fixed waveguide block 40 is also possible, and in this case, the three waveguide paths 61 to 63 of the movable waveguide block 60 are also disposed asymmetrically.
The movable waveguide block 60 is slidably supported by the driving device 70 provided on the base portion 31. Although the structure of the driving device 70 is arbitrary, for example, a structure that converts the rotary motion of the stepping motor into linear motion and transmits the motion to the support member that supports the movable waveguide block 60 from the lower surface side of the base portion 31. In this case, the position and movement distance of the movable waveguide block 60 are detected by a sensor, an encoder, or the like, and the movable waveguide block 60 may be controlled to be able to selectively move to at least the neutral position in
The choke groove 25 as shown in any of
As described above, the waveguide connection structure 1 according to the present embodiment has a structure in which a choke groove 25 having a shape that covers a region having a strong electric field of the electromagnetic wave leaking into the predetermined gap g between the waveguide 10 and the waveguide 20 is formed in one or both of the end face 10b and the end face 20a. With this configuration, the waveguide connection structure 1 according to the present embodiment can effectively suppress leakage of electromagnetic waves from the connection point of the two waveguides 10 and 20 facing each other.
Further, the waveguide connection structure 1 according to the present embodiment may be a structure in which the four groove portions 25a to 25d forming the choke groove 25 are separated from each other by four non-groove portions 27a to 27d along the diagonal direction of the opening of the rectangle of the waveguide path 11 or the waveguide path 21, in the band-shaped region R. With this configuration, the waveguide connection structure 1 according to the present embodiment can suppress the return loss S11 to less than -15 dB, over the entire operating frequency range of a WR-3 waveguide (fractional bandwidth of about 40%), for example, with respect to a predetermined gap g up to about ⅒ wavelength of the guide wavelength.
Further, in the determination method of the waveguide connection structure 1 according to the present embodiment, the shape of the equiphase surface of the electromagnetic waves of the leakage prevention target frequency propagating from one to the other of the two analysis waveguides is acquired by electromagnetic field analysis, so that it is possible to determine the range of the band-shaped region R on either one or both of the end face 10b and the end face 20a of the two waveguides 10 and 20.
Further, in the manufacturing method of the waveguide connection structure 1 according to the present embodiment, the choke groove 25 is formed in the band-shaped region R of either one or both of the end face 10b and the end face 20a determined by the above determination method, and the two waveguides 10, 20 are disposed such that the end faces 10b and 20a face each other in parallel with a predetermined gap g therebetween. With this configuration, the manufacturing method of the waveguide connection structure 1 according to the present embodiment can manufacture the waveguide connection structure 1 capable of effectively suppressing the leakage of electromagnetic waves from a connection point of two facing waveguides 10 and 20.
Further, the waveguide switch 100 according to the present embodiment uses the above-described waveguide connection structure 1 for the moving unit (movable waveguide block 60), thereby improving the return loss and insertion loss of the switch over a wide band, and can suppress the unintended leakage of electromagnetic waves in the gap between the first fixed waveguide block 40 and the movable waveguide block 60 and the gap between the second fixed waveguide block 50 and the movable waveguide block 60.
Further, the waveguide switch 100 according to the present invention uses the above-described waveguide connection structure 1 for the moving unit (the movable waveguide block 60), so that the gap between the first fixed waveguide block 40 and the movable waveguide block 60 and the gap between the second fixed waveguide block 50 and the movable waveguide block 60 can be made wider than before, and the machining accuracy is relaxed and the resistance to aging is improved.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2021-202418 | Dec 2021 | JP | national |
