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WO2021020763A1 - Guide d'ondes de connexion d'adaptateur et câble coaxial avec structure de couplage de type ouvert - Google Patents

Guide d'ondes de connexion d'adaptateur et câble coaxial avec structure de couplage de type ouvert Download PDF

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Publication number
WO2021020763A1
WO2021020763A1 PCT/KR2020/008989 KR2020008989W WO2021020763A1 WO 2021020763 A1 WO2021020763 A1 WO 2021020763A1 KR 2020008989 W KR2020008989 W KR 2020008989W WO 2021020763 A1 WO2021020763 A1 WO 2021020763A1
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WIPO (PCT)
Prior art keywords
hollow
waveguide flange
waveguide
flange portion
protrusion
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PCT/KR2020/008989
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English (en)
Korean (ko)
Inventor
한규환
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Raytech Engineering Corp
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Raytech Engineering Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/085—Coaxial-line/strip-line transitions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/32—Non-reciprocal transmission devices

Definitions

  • the present invention relates to an adapter for connecting a waveguide and a coaxial line in an open coupling structure, and an open coupling of a waveguide and a coaxial line so as to achieve a broadband low-loss transmission characteristic even in a limited space while excluding the possibility of damage to an active component in a transceiver. It relates to an adapter for connecting in a structure.
  • a coax cable and a waveguide are used as a transmission line between a transceiver and an antenna.
  • a coaxial cable is a cable in which the center conductor is placed in the center of the cylindrical outer conductor surrounding it and an insulator is interposed therebetween.
  • the transmission characteristics of radio waves passing through the cable even in the case of high frequencies such as VHF and UHF It has good properties.
  • the waveguide is a transmission line with a high frequency (1 GHz or more) of microwave or higher, and allows electromagnetic waves to pass through the inside of a tube made of an electric conductor such as aluminum or copper, so that electricity does not directly flow through the surrounding conductors, so that resistance loss is small.
  • a tube made of an electric conductor such as aluminum or copper
  • resistance loss is small.
  • dielectric loss is also small.
  • the electromagnetic wave formed from the central conductor of the coaxial line propagates to the inside of the waveguide, so that radio waves in a high frequency band can be transmitted.
  • the conventional adapter can be divided into a right-angle adapter and an end-launch adapter (source- Microwaves101.com, The world's microwave information resource since 2001(July 02, 2019), Waveguide to coax transitions).
  • the rectangular adapter is a structure in which the waveguide housing 1 and the central conductor 3 of the coaxial line 2 are arranged at a right angle, as shown in FIG. 1, and the length, position and position of the probe of the central conductor Transmission characteristics (frequency band, insertion loss, return loss, etc.) are determined by the adjusting screw.
  • the horizontal adapter is a structure in which the housing 4 of the waveguide and the center conductor 6 of the coaxial line 5 are arranged in a straight line, as shown in FIG. 2, and the length of the probe of the center conductor and the probe are surrounded.
  • Transmission characteristics frequencies band, insertion loss, return loss, etc.
  • the cheap shorting elbow (7) it is possible to configure the adapter system even in a small space because it is subject to less restrictions on the degree of freedom in space.
  • Patent Document 1 US Patent Publication No. US4891614A (hereinafter referred to as Patent Document 1) published on January 2, 1990 under the name of'asymmetric discontinuous matching in transmission line'.
  • FIG. 3 is a cross-sectional view showing the configuration of a conventional patent document 1;
  • FIG. 4 is a cross-sectional view showing a simulation result of electric field distribution of an existing DC-open structure adapter similar to that of Patent Document 1.
  • FIG. 4 is a cross-sectional view showing a simulation result of electric field distribution of an existing DC-open structure adapter similar to that of Patent Document 1.
  • the central conductor 101 protrudes into the 1/4 wavelength transformer 100 in an open manner, and has a corner section 116 which is a space protruding by d away from the central axis on one side wall, and the other side wall.
  • the waveguide 115 has a detachable capacitive stub 118 that is remote from the center conductor.
  • the conventional electric field distribution does not cover the'full octave bandwidth' in terms of the bandwidth of the operating frequency in terms of performance in the millimeter wave region, so commercial demand is limited and thus commercialization is not possible.
  • Patent Document 1 US Patent Publication No. US4891614A (published on Jan. 2, 1990)
  • An object of the present invention is to eliminate the possibility of damage to active components in a transceiver such as a radar system or a communication system operating in the millimeter wave region, and transmit a full an octave bandwidth, low loss, even in a limited space. It is to provide an adapter that connects the waveguide and the coaxial line in an open-type coupling structure (End-launch), which can achieve the characteristics.
  • the present invention for solving the above problems relates to an adapter for connecting a waveguide and a coaxial line in an open coupling structure, comprising: a coaxial line connector formed with a hollow for connecting a coaxial line having a central conductor on one side; A waveguide flange portion formed with a hollow for connecting the waveguide to the opposite side of the coaxial line; And a coupling plate disposed between the coaxial line connection portion and the waveguide flange portion and having a hollow through which the central conductor of the coaxial line passes, wherein the waveguide flange portion is spaced apart from one surface of the side to which the coupling plate is coupled.
  • a protrusion protruding toward a central axis of the waveguide flange is formed, the central conductor of the coaxial line and the protrusion are adjacent non-contact structure (DC-Open), and the hollow of the waveguide flange is formed on the side of the central conductor of the protrusion.
  • first and second hollows divided by a boundary on one side an end of the center conductor is disposed in the first hollow, the protrusion is disposed in the second hollow, and the first hollow facing the protrusion
  • One side wall of the first hollow forms a first space that is more depressed to one side than one side wall of the second hollow adjacent to the first hollow, and the other side wall of the first hollow on the side of the protrusion is greater than the other side wall of the second hollow. It is possible to form a second space that is further recessed to the other side.
  • the first hollow second space may be farther away from the axis of the central conductor in a vertical direction than the first hollow first space.
  • the protrusion may be integrally coupled with the inner wall of the waveguide flange to extend.
  • a portion of the central conductor extending into the waveguide flange portion is not electrically connected to a portion of the waveguide flange portion or a separate active element connected to the waveguide flange portion. May be in a grounded state.
  • one side wall of the second hollow extending from one side wall of the first hollow may be tapered toward the inside of the hollow of the waveguide flange portion with a width equal to the width of the center conductor.
  • the inner wall of the second hollow of the waveguide flange portion is formed such that the distance from the central axis of the waveguide flange portion increases discontinuously with a predetermined interval as the distance from the protrusion increases. I can.
  • the inner wall of the waveguide flange can be designed to minimize reflection loss and insertion loss of frequency.
  • FIG. 1 is a cross-sectional view showing the configuration of a conventional right-angle adapter.
  • Figure 2 is a cross-sectional view showing the configuration of a conventional horizontal adapter (end-launch adapter).
  • FIG. 3 is a cross-sectional view showing the configuration of a conventional patent document 1;
  • FIG. 4 is a cross-sectional view showing a simulation result of electric field distribution of an existing DC-open structure adapter similar to that of Patent Document 1.
  • FIG. 4 is a cross-sectional view showing a simulation result of electric field distribution of an existing DC-open structure adapter similar to that of Patent Document 1.
  • FIG. 5 is a cross-sectional view showing the coupling structure of the adapter according to the present invention.
  • FIG. 6 is a cross-sectional view showing a structure inside a waveguide flange portion for minimizing frequency reflection loss and insertion loss according to the present invention.
  • FIG. 7 is a perspective view showing the coupling structure of the adapter according to the present invention.
  • FIG. 8 is a cross-sectional view schematically showing a distribution of an electromagnetic field of a radio wave due to conjugate matching in a higher-order mode in a waveguide flange portion.
  • FIG. 9 is a diagram schematically showing the electric field distribution of the adapter according to the present invention in the case of the low frequency region and the case of the high frequency region in the entire operating frequency band of the Ka-band.
  • FIG. 10 is a diagram showing a return loss simulation result of the adapter according to the present invention in each of the Ka-band and E-band.
  • FIG. 11 is a diagram showing simulation results of each return loss performance for the present invention having a conjugating matching structure and an adapter having a conventional open structure.
  • 5 is a cross-sectional view showing the entire coupling structure of the adapter according to the present invention.
  • 6 is a cross-sectional view showing a structure inside a waveguide flange portion for minimizing frequency reflection loss and insertion loss according to the present invention.
  • 7 is a perspective view showing the coupling structure of the adapter according to the present invention.
  • the adapter for connecting the waveguide and the coaxial line of the present invention in an open coupling structure may be applied to a transceiver used in a millimeter wave band.
  • the adapter for connecting the waveguide and the coaxial line of the present invention in an open coupling structure shows the shape and performance curve of the adapter in the Ka-band band, and is preferably applied to the adapter design in the entire frequency band of millimeter waves (frequency 30 GHz to 300 GHz). .
  • the adapter of the present invention has a radio wave transmission line having a structure in which the coaxial connection portion 10 and the waveguide flange portion 20 are coaxially coupled with the coupling plate 30 interposed therebetween.
  • Part of the central conductor 11 passing through the hollow 31 along the longitudinal central axis of the coupling plate 30 extends to the inside of the waveguide flange 20, and the central conductor 11 inside the waveguide flange 20
  • An electromagnetic field formed from the periphery of) is transmitted from the inside of the waveguide flange 20 to the waveguide.
  • the transmission characteristics of the signal (frequency band, insertion) according to the length of the central conductor 11 inside the waveguide flange 20 and the overall structure of the inner wall of the waveguide flange 20 Loss, return loss) is determined.
  • the adapter for connecting the waveguide and the coaxial line in an open coupling structure includes a coaxial line connection part 10, a waveguide flange part 20, and a coupling plate 30.
  • the coaxial line connector 10 is a portion to which the coaxial line is connected, and may be formed in a hollow shape having a hollow for connecting the coaxial line to one side.
  • the coaxial cable is a cable with the center conductor 11 placed in the center of the cylindrical outer conductor surrounding it and an insulator sandwiched between them.
  • the transmission characteristics of the flowing radio waves are good. It has a characteristic that makes it possible.
  • the central conductor 11 passes through the hollow 31 along the center of the coupling plate 30 in the longitudinal direction, and the radio wave signal flows toward the waveguide in an electrical form along the central conductor 11.
  • the waveguide flange part 20 is a part to which the waveguide is connected, and may be formed of a hollow type having a hollow for connecting the waveguide to the opposite side of the coaxial line.
  • the term opposite to the coaxial line means the side to which the coaxial line is connected to the coaxial line connection part and the opposite side in the horizontal direction.
  • the coaxial line connection portion 10 In order for the central conductor 11 to transmit a signal of a coaxial line, the coaxial line connection portion 10 must be coupled to the waveguide flange portion 20, but in the present invention, the coaxial line connection portion 10 is coupled to the waveguide flange portion 20
  • the plate 30 is interposed and coupled to the longitudinal side, that is, in the horizontal direction.
  • the hollow of the coaxial connection portion 10, the hollow of the coupling plate 30, and the hollow of the waveguide flange portion 20 may be arranged so that their central axes coincide.
  • the waveguide flange part 20 is a part to which the waveguide is connected, and may be formed of a hollow type having a hollow for connecting the waveguide to the opposite side of the coaxial line.
  • the term opposite to the coaxial line means the side to which the coaxial line is connected to the coaxial line connection part and the opposite side in the horizontal direction.
  • the coaxial line connection portion 10 in order for the central conductor 11 to transmit a signal of a coaxial line, the coaxial line connection portion 10 must be coupled to the waveguide flange portion 20, but in the present invention, the coaxial line connection portion 10 is the waveguide flange portion 20 It is coupled to the longitudinal side, that is, in the horizontal direction with the coupling plate 30 therebetween.
  • the hollow of the coaxial line connection portion 10, the hollow of the coupling plate 30, and the hollow of the waveguide flange portion 20 may be arranged so that their central axes coincide.
  • the waveguide flange part 20 may include a fitting part 21 to which the coaxial connection part 10 is fitted.
  • the fitting portion 21 may be formed in plural, and formed in the form of a cylindrical groove extending in the longitudinal direction of the waveguide flange portion 20 from one surface of the waveguide flange portion 20 to which the coaxial connection portion 10 is coupled. I can.
  • the coaxial connection portion 10 may include a groove portion having a shape corresponding to the fitting portion 21 of the waveguide flange portion 20.
  • the groove portion may be formed in plural, and may be formed in a cylindrical protruding shape extending in the longitudinal direction of the waveguide flange portion 20 toward a direction coupled to the waveguide flange portion 20. .
  • the coaxial line connection portion 10 and the waveguide flange portion 20 may be coaxially coupled to each other.
  • the coaxial connection 10 and the waveguide flange 20 are not vertically coupled, but are coaxially coupled, thereby minimizing the restriction on the degree of freedom in space in the system design including the adapter. .
  • the coaxial line connection part 10 is directly connected to the waveguide flange part 20, the center conductor 11 protruding inside the waveguide flange part 20 is fixed and grounded, and a short elbow ( shorting elbow) is required separately.
  • the present invention is an open coupling structure of a center conductor that does not require a grounding structure such as a short elbow, and may further include a coupling plate 30 for fixing the center conductor 11 outside the waveguide flange portion 20 .
  • the coupling plate 30 may have one side coupled to the coaxial line connection portion 10, the other side coupled to the waveguide flange portion 20, and a hollow 31 along a central axis in the longitudinal direction. . At this time, the center conductor 11 may be disposed to pass through the hollow 31.
  • the coupling plate 30 may be disposed between the coaxial connection portion 10 and the waveguide flange portion 20.
  • the hollow 31 may have, for example, a circular or rectangular cross section, and some sections along the central axis may have a small distance from the central axis, and other sections may have a large distance from the central axis.
  • the hollow 31 of the coupling plate 30 may be coupled such that its central axis coincides with the central axis of the waveguide flange portion 20.
  • the hollow 31 of the coupling plate 30 may be formed such that the inner wall has a predetermined distance from the central axis of the coupling plate 30, and the inner hollow of the waveguide flange portion 20 is the waveguide flange portion 20
  • the distance from the central axis of) to the inner wall may be formed to have a predetermined distance greater than the distance from the central axis of the hollow 31 of the coupling plate 30 to the inner wall.
  • the central conductor 11 extends from the side of the coaxial connection portion 10 to a part of the inside of the waveguide flange portion 20, and at this time, it passes through the hollow 31 of the coupling plate 30.
  • a hollow fixture capable of enclosing and fixing the central conductor 11 may be separately mounted in the hollow 31 of the coupling plate 30.
  • the fixture may be formed integrally or may be formed so that separate parts of the upper and lower parts are combined. The fixture may tightly fix the central conductor 11 on the central axis.
  • the length excluding the length of the hollow 31 through which the central conductor 11 passes is substantially It corresponds to a part of the center conductor 11 having a function of converting the electrical signal flowing through the center conductor 11 into an electromagnetic field and propagating it into the waveguide flange 20.
  • the user may use the coaxial line and the central conductor and The protruding length of the central conductor 11 may be adjusted through screwing between the insulators, but by appropriately setting the thickness of the coupling plate 30, that is, the length in the axial direction of the coupling plate 30, the central conductor It is also possible to adjust the protrusion length of (11).
  • the protruding length of the center conductor 11 from the inside of the waveguide flange portion 20 becomes smaller that much.
  • the protruding length of the center conductor 11 from the inside of the waveguide flange portion 20 becomes larger that much.
  • the waveguide flange portion 20 may be disposed so that the coaxial connection portion 10 and the central axis coincide, and the central conductor 11 passes through the hollow 31 of the coupling plate 30 to form a waveguide. It may extend into the flange portion 20 along the longitudinal direction thereof.
  • the structure of the central conductor 11 extending into the waveguide flange portion 20 is as follows.
  • a part of the central conductor 11 extending into the inside of the waveguide flange 20 is not electrically connected to a part of the waveguide flange 20 or a separate active element connected to the waveguide flange 20. Can be placed in a grounded state.
  • the active element is, for example, a component of the electric circuit of the adapter connected through the inner wall of the shorting elbow 7 or the waveguide flange 20 as shown in FIG. It corresponds to (not shown).
  • a part of the central conductor 11 extending into the inside of the waveguide flange portion 20 does not come into contact with the portion protruding from the inner wall of the waveguide flange portion 20 or coupled with the inner wall, and does not contact ) Is fixed on the inner side of the waveguide, and floats from the inside along the central axis of the waveguide flange 20.
  • the conventional grounding configuration of a closed circuit using a short elbow, etc. is a structure in which the center conductor 11 is fitted and coupled to the short elbow, so insertion loss of frequency may occur, but in the above configuration of the present invention, the center conductor 11 ) Is not fitted to the short elbow, but is fixed inside the coupling plate 30, and floats inside the waveguide flange portion 20, so that the occurrence of such frequency insertion loss can be minimized.
  • a protrusion 22 may be formed that is spaced apart from one surface of the side to which the coupling plate 30 is coupled and protrudes toward the center of the waveguide flange part 20.
  • the protrusion 22 may protrude in a direction perpendicular to the longitudinal direction of the waveguide flange 20.
  • the protrusion 22 may be integrally coupled with the inner wall of the waveguide flange 20 to extend.
  • the central conductor 11 and the protrusion 22 of the coaxial line may be disposed in a non-contact structure (DC-Opem) adjacent to each other.
  • the non-contact structure of the coaxial center conductor 11 and the protrusion 22 in close proximity means the first and second hollows (A1, A1, which are divided by a boundary on one surface of the waveguide flange part 20 on the side of the center conductor 11), as will be described later. It means that the protrusion 22 is extended to the boundary of A2), so that the protrusion 22 is disposed so as to be in contact with the center conductor 11 of the coaxial line and not in contact with it.
  • the protrusion 22 adjusts the size of the inner space of the waveguide flange 20 on the side of the central conductor 11 so that the impedance of the propagating radio wave can be appropriately set by changing the distribution of the electromagnetic wave from the central conductor 11. do. Meanwhile, by adjusting the thickness of the hollow 31 or the distance from the inner wall and the central axis, it is possible to additionally change the distribution of the electromagnetic field to the central conductor 11.
  • the protrusion 22 has a certain height and thickness, and may be formed to extend from an inner wall of one side of the waveguide flange 20 or may be formed in a manner that is separately coupled to the inner wall.
  • the size of the inner space of the waveguide flange portion 20 on the side of the center conductor 11 separated by the protrusion 22 is adjusted to the length protruding into the waveguide flange portion 20 of the central conductor 11 or , It can be arbitrarily set by adjusting the height or thickness of the protrusion 22.
  • the hollow of the waveguide flange portion 20 includes first and second hollows A1 and A2 divided by a boundary on one surface of the protrusion 22 on the side of the center conductor 11.
  • the end of the center conductor 11 is disposed in the first hollow A1, and the protrusion 22 is disposed in the second hollow A2.
  • One side wall of the first hollow (A1) has a diameter of the protrusion 22 of the first hollow (A1) to one end in the longitudinal direction of the second hollow (A2) adjacent to the first hollow (A1) It may be formed to be larger than the diameter to one end in the longitudinal direction of. That is, the heights of one side wall of the first hollow A1 and one side wall of the second hollow A2 are different while crossing the boundary between the first hollow A1 and the second hollow A2.
  • a first space BS in which one side wall of the first hollow A1 facing the protrusion 22 is further depressed to one side than one side wall of the second hollow A2 is formed.
  • One side wall of the second hollow (A2) may be formed so that the diameter of the protrusion to one end in the longitudinal direction increases in a tapered step shape to the boundary between the first hollow (A1) and the second hollow (A2). have.
  • One side wall of the first hollow (A1) extending from one side wall of the second hollow (A2) is the same length as the width of the protrusion 22 on the opposite side of the central conductor 11, and the inside of the hollow of the waveguide flange. It may be formed in a tapered shape toward the.
  • the central conductor 11 is placed very close to the protrusion 22 within the first hollow (A1). Can be.
  • the gap between the center conductor 11 and the protrusion 22 may be set based on 1.5% of a wavelength of a corresponding central frequency for each frequency band in a millimeter wave band.
  • the gap between the center conductor 11 and the protrusion 22 may be set to 0.0045 inches based on this.
  • a second space is formed in which the other side wall of the first hollow A1 on the side of the protrusion 22 is further depressed to the other side than the other side wall of the second hollow A2.
  • the other side wall of the second space of the first hollow A1 may be formed to be spaced apart from the central axis of the hollow of the waveguide flange 22 than the one side wall of the first space BS of the first hollow A1 .
  • the distance (C) from one surface of the protrusion 22 on the side of the central conductor 11 to the boundary between the hollow of the waveguide flange 20 and the hollow of the coupling plate 30 (C), and one side wall of the first hollow (A1) And the other side wall may be formed to have the same width.
  • FIG. 8 is a cross-sectional view schematically showing a distribution of an electromagnetic field of a radio wave due to conjugate matching in a higher-order mode in a waveguide flange portion.
  • Figure 8 (a) is a diagram schematically showing the propagation of an electromagnetic field in the flange portion of the waveguide according to the present invention
  • Figure 8 (b) is for the conjugating matching according to the first space of the first hollow according to the present invention It is a diagram showing in more detail the propagation of an electromagnetic field.
  • the protrusion 22 is disposed very close to the central conductor 11 of the coaxial line, and is formed opposite the protrusion 22 and the protrusion 22.
  • Conjugate matching is performed between the first space BS of the hollow A1. That is, an additional backshot corresponding to a higher order mode is formed with respect to the existing backshot. Accordingly, in the junction area when the frequency is increased, the bandwidth can be increased to a full octave by conjugate matching in a higher-order mode.
  • FIG. 9 is a diagram schematically showing the electric field distribution of the adapter according to the present invention in the case of the low frequency region and the case of the high frequency region in the entire operating frequency band of the Ka-band.
  • FIG. 9A shows a case of a low frequency region in the Ka band (Ka-band)
  • FIG. 9B shows a case of a high frequency region (40 GHz) in the Ka band (Ka-band).
  • FIG. 10 is a diagram showing a return loss simulation result of the adapter according to the present invention in each of the Ka-band and E-band.
  • FIG. 10A shows a simulation result of the adapter's return loss in the case of Ka-band
  • FIG. 10B shows the simulation result of the adapter's return loss in the case of the E-band.
  • Fig. 10 (a) and (b) were obtained by simulating the return loss using HFSS S/W, respectively, and measuring the performance with a VNA (Vector Network Analyzer) by making a prototype.
  • VNA Vector Network Analyzer
  • the transmission characteristics of the simulation and measurement values are well matched, and the reflection performance is also excellent at -20 dB or less covering a full octave in the entire operating frequency range (26.5 to 40 GHz). It shows performance (A Full octave bandwidth cover).
  • the simulation result for the return loss in the E-band also satisfies the target performance very similarly to the case of the Ka-band.
  • FIG. 11 is a diagram showing simulation results of each return loss performance for the present invention having a conjugating matching structure and an adapter having a conventional open structure (Patent Document 1; US Patent Publication No. US4891614A).
  • the result according to the present invention is shown as a line corresponding to'having a conjugating matching structure', and the result according to the conventional open structure is a line corresponding to'no conjugating matching structure'. It is shown as.
  • the conventional adapter having an open structure does not satisfy a transmission characteristic of less than -20dB in all sections, and satisfies only about "at least half an octave". That is, in the conventional case, transmission performance is limited in the corresponding operating frequency band, and thus there is no marketability at all.
  • the present invention it is possible to exhibit excellent transmission performance that satisfies a "full octave band" of -20dB or less, which is a requirement in all sections of a corresponding operating frequency. At the same time, it is possible to achieve a transmission characteristic of a full octave bandwidth (full an octave bandwidth, low loss) while optimally using the space without damage to the active component in the circuit in the millimeter wave region.
  • the inner wall of the second hollow A2 of the waveguide flange part 20 is formed so that the distance from the central axis of the waveguide flange part 20 increases discontinuously with a predetermined interval as the distance from the protrusion part 22 increases. Can be.
  • the electromagnetic field propagation from the center conductor 11 passes through the protrusion 22 and discontinuously propagates from a relatively small space to a large space.
  • the electric wave of the electromagnetic field does not propagate into a space having a large distance from the central axis immediately after passing through the protrusion 22, but the central axis
  • the inner wall of the waveguide flange 20 is formed so that the distance from the waveguide is discontinuously changed at a predetermined interval.
  • the preset interval and the width of the change in the distance from the central axis may be set as numerical values for minimizing the return loss and insertion loss of the radio wave, for example, the waveguide flange
  • the distance from the central axis of the inside of the waveguide may be formed to increase discontinuously as it faces the opposite side of the coupling plate 30 from the inside of (20).
  • the present invention can have an optimized distribution in the electromagnetic field propagation in the waveguide flange portion 20 as shown in FIGS. 5 and 6.
  • the inner wall of the waveguide flange may be designed to minimize reflection loss and insertion loss of frequency.
  • the length of the central conductor 11 extending into the inside of the waveguide flange 20, the distance from the central axis of the hollow inner wall of the coupling plate 30, and the internal structure of the waveguide flange 20 It can be designed to be set optimally.
  • the inner wall of the waveguide flange part 20 is formed from the protrusion 22 to the waveguide flange part 20 in the longitudinal direction of the waveguide flange part 20
  • a plurality of stepped portions 23 arranged alternately are formed as the distance in the opposite direction of the one side of the coupling plate 30 of 20) is coupled, and the stepped portion 23 is the center of the inner wall of the waveguide flange portion 20 It can be made to increase the distance from the axis discontinuously.
  • the stepped portion 23 may be tapered to increase a distance from the central axis of the waveguide flange portion 20 along the propagation path of the signal from the central conductor 11.
  • the electromagnetic wave is formed from one end of the central conductor 11, and is caused by a protrusion 22 having a distance from the central axis of "F” through the width of "C".
  • the propagation characteristics are adjusted.
  • Radio waves passing through the protrusion 22 propagate from the width of “I” to the space having a distance from the central axis of “H”, and the distance from the central axis at the width of “K” through the step 23 is relatively It propagates to a space having a larger “J” distance, and then a space having a relatively larger “L” distance from the central axis in the width of the “M” part through the step 23 Is propagated.
  • the inner wall of the waveguide flange may be designed to set an optimum value in millimeter wave (frequency of 30 GHz to 300 GHz full frequency band signal transmission.
  • millimeter wave frequency of 30 GHz to 300 GHz full frequency band signal transmission.
  • the inside of the waveguide flange 20 By precisely setting the structure, in particular, it can accurately transmit signals in the entire frequency band of 26.5 to 40 GHz, and it can be designed to achieve an insertion loss of 0.25 dB or less and a return loss of 1.2:1 or less.
  • the present invention in the radar system or communication system in the millimeter wave region, without including a separate configuration such as a separate short elbow in contact with the center conductor, the transmission wave in the TEM mode (Transverse Electromagnetic Mode) TE10 mode (Transverse mode) Electric Mode) can provide an optimized internal structure of a sophisticated adapter.
  • TEM mode Transverse Electromagnetic Mode
  • TE10 mode Transverse mode
  • Electric Mode can provide an optimized internal structure of a sophisticated adapter.
  • A1 the first hollow of the waveguide flange
  • A2 the second hollow of the waveguide flange
  • HM1 Distribution of electric field corresponding to higher order mode
  • HM2 Distribution of electric field into the first space

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  • Waveguide Connection Structure (AREA)

Abstract

La présente invention concerne un adaptateur pour connecter un guide d'ondes et un câble coaxial dans une structure de couplage de type ouvert, l'adaptateur comprenant : une partie de connexion de câble coaxial ayant un creux pour connecter un câble coaxial qui a un conducteur central sur un côté de celui-ci ; une partie de bride de guide d'ondes ayant un creux pour connecter un guide d'ondes au côté opposé en tant que câble coaxial ; et une plaque de couplage disposée entre la partie de connexion de câble coaxial et la partie de bride de guide d'ondes et ayant un creux à travers lequel passe le conducteur central du câble coaxial. La partie bride de guide d'ondes a, disposée à l'intérieur de celle-ci, une saillie qui est espacée de la surface sur le côté auquel la plaque de couplage est couplée, et fait saillie vers l'axe central de la partie bride de guide d'ondes. Le conducteur central du câble coaxial et la saillie sont conçus pour être adjacents l'un à l'autre dans une structure sans contact (CC-ouverte). Le creux de la partie bride de guide d'ondes comprend des premier et second creux qui sont divisés avec la surface de la saillie qui se trouve sur le côté conducteur central en tant que délimitation. Une extrémité du conducteur central est disposée dans le premier creux, et la saillie est disposée dans le second creux. Une paroi latérale du premier creux faisant face à la saillie peut former un premier espace qui est davantage enfoncé vers un côté que la paroi latérale du second creux qui est adjacent au premier creux. L'autre paroi latérale du premier creux sur le côté de la saillie peut former un second espace qui est davantage enfoncé vers l'autre côté que l'autre paroi latérale du second creux.
PCT/KR2020/008989 2019-07-31 2020-07-09 Guide d'ondes de connexion d'adaptateur et câble coaxial avec structure de couplage de type ouvert Ceased WO2021020763A1 (fr)

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KR20190093379 2019-07-31
KR10-2019-0093379 2019-07-31
KR1020200044209A KR102134332B1 (ko) 2019-07-31 2020-04-10 도파관과 동축선을 개방형 결합구조로 접속시키는 어댑터
KR10-2020-0044209 2020-04-10

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KR102617311B1 (ko) 2022-08-08 2023-12-27 엘아이지넥스원 주식회사 적층 제조가 가능한 엔드 론치형 도파관 동축 변환 구조 및 그 제조 방법
KR102851794B1 (ko) 2023-11-16 2025-08-28 충북대학교 산학협력단 원형 도파관 변환 장치

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US4891614A (en) * 1986-05-29 1990-01-02 National Research Development Corporation Matching asymmetrical discontinuties in transmission lines
JP2556004Y2 (ja) * 1992-10-19 1997-12-03 アルプス電気株式会社 導波管とｍｓｌの接続構造
US20050248419A1 (en) * 2004-03-11 2005-11-10 Will Freeman Matching feed partially inside a waveguide ridge
JP2008148103A (ja) * 2006-12-12 2008-06-26 Mitsubishi Electric Corp マイクロ波用伝送装置
JP2019029815A (ja) * 2017-07-29 2019-02-21 新日本無線株式会社 導波管−伝送線路変換器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4891614A (en) * 1986-05-29 1990-01-02 National Research Development Corporation Matching asymmetrical discontinuties in transmission lines
JP2556004Y2 (ja) * 1992-10-19 1997-12-03 アルプス電気株式会社 導波管とｍｓｌの接続構造
US20050248419A1 (en) * 2004-03-11 2005-11-10 Will Freeman Matching feed partially inside a waveguide ridge
JP2008148103A (ja) * 2006-12-12 2008-06-26 Mitsubishi Electric Corp マイクロ波用伝送装置
JP2019029815A (ja) * 2017-07-29 2019-02-21 新日本無線株式会社 導波管−伝送線路変換器

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