EP0500949A1 - Microwave circuit - Google Patents
Microwave circuit Download PDFInfo
- Publication number
- EP0500949A1 EP0500949A1 EP91915147A EP91915147A EP0500949A1 EP 0500949 A1 EP0500949 A1 EP 0500949A1 EP 91915147 A EP91915147 A EP 91915147A EP 91915147 A EP91915147 A EP 91915147A EP 0500949 A1 EP0500949 A1 EP 0500949A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- short
- circuit
- contact
- microwave
- metal body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims description 24
- 239000004020 conductor Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000644 propagated effect Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/001—Manufacturing waveguides or transmission lines of the waveguide type
- H01P11/002—Manufacturing hollow waveguides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/24—Terminating devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/24—Terminating devices
- H01P1/28—Short-circuiting plungers
-
- 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
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
- H01P5/107—Hollow-waveguide/strip-line transitions
Definitions
- the present invention relates to a microwave circuit used in a microwave communication apparatus, a satellite broadcast receiving converter or the like.
- Fig. 7 shows a short-circuit section of a conventional cylindrical waveguide
- Fig. 8 is a sectional view of the same.
- numeral 1 indicates a metal body including a cylindrical waveguide 5
- numeral 2 indicates a mounting surface for a short-circuit plate 4.
- the short-circuit plate 4 is fixed to the mounting surface 2 by means of screws or the like to form a short-circuit plane. If the short-circuit plate 4 is in an ideal short-circuit state, a microwave being propagated through the cylindrical waveguide 5 makes a total reflection to change the direction of propagation without involving any loss.
- the microwave circuit of the present invention comprises: a first metal body having a concentric-circle-like prominence provided at an end of a cylindrical microwave transmission path and extending outwardly from a cylindrical inner wall; and a second metal body having a planar configuration and held in contact with the first metal body.
- the first metal body is held in contact with the second planar metal body solely through a small region corresponding to the prominence provided on the outside of the cylindrical inner wall thereof, thereby attaining an adequate electromagnetic contact between the two metal bodies and ensuring satisfactory characteristics.
- Fig. 1 shows a short-circuit section of a cylindrical waveguide according to the present invention
- Fig. 2 shows a sectional view of the same.
- numeral 1 indicates a metal body including a cylindrical waveguide 5
- numeral 2 indicates a mounting surface for a short-circuit plate 4. If the short-circuit plate 4 is in an adequate short-circuit state, a microwave propagated through the cylindrical waveguide 5 makes a total reflection to change the direction of propagation without involving any loss.
- the short-circuit plate 4 is brought into contact with a concentric-circle-like prominence 3 before it is brought into contact with the mounting surface 2 at the time of mounting, so that the contact of the short-circuit plate 4 with the end surface of the inner-wall section of the cylindrical waveguide 5, which is important when realizing a short-circuit plane, can be attained in an adequate manner, thereby ensuring a satisfactory short-circuit characteristic not depending upon the surface precision of the mounting surface 2. Further, since the short-circuit plate 4 is brought into contact with the inner wall of the cylindrical waveguide 5 before it is brought into contact with the mounting surface 2, it is possible to realize a satisfactory short-circuit plate even if a particularly high level of flatness cannot be ensured for the short-circuit plate 4.
- FIG. 3 shows a short-circuit section of a cylindrical waveguide according to another embodiment of the present invention
- Fig. 4 shows a sectional view of the same.
- numeral 1 indicates a metal body including a cylindrical waveguide 5; numeral 2 indicates a mounting surface for a short-circuit plate; and numeral 3 indicates a concentric-circle-like prominence.
- the sectional configuration of the concentric-circle-like prominence 3 is changed so as to facilitate the machining thereof.
- this structure is free from the influence of the surface precision of the contact surface 2, and through the contact of the short-circuit plate 4 with the concentric-circle-like prominence 3, it is possible to ensure satisfactory characteristics for the short-circuit plane of the cylindrical waveguide.
- FIG. 5 and 6 show a sectional view of cylindrical-waveguide/microstrip-line conversion sections in other embodiments of the present invention.
- Numeral 10 indicates a metal body including a cylindrical waveguide; numeral 6 indicates a post member; numeral 7 indicates an MIC substrate having a microstrip line; numeral 8 indicates a metal supporter for forming a hollow coaxial line-together with the post member 6; and numeral 9 indicates a dielectric supporter forming a dielectric coaxial line with the post member 6.
- a microwave propagated through the cylindrical waveguide in a direction perpendicular to the plane of the drawings is converted to a coaxial mode in the section of the post member 6 and propagated through coaxial lines formed by the components 9 and 8, and mode conversion is further effected in the connecting section between the MIC substrate 7 and the post member 6 to propagate the microwave through the microstrip line on the MIC substrate 7.
- a concentric-circle-like prominence is provided on the external conductor forming one coaxial line, and brought into contact with the external conductor of the other coaxial line, thereby preventing loss and deterioration in VSWR due to the generation of discontinuous portions in the coaxial external conductors.
- a first metal body having a concentric-circle-like prominence at an end of a cylindrical microwave transmission path and extending outwardly from a cylindrical wall is brought into contact with a second metal body having a planar configuration, whereby any discontinuity in the external conductor sections in the microwave transmission path is eliminated and satisfactory transmission characteristics can be obtained, this providing a remarkable advantage.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Microwave Amplifiers (AREA)
- Waveguide Connection Structure (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Non-Reversible Transmitting Devices (AREA)
Abstract
Description
- The present invention relates to a microwave circuit used in a microwave communication apparatus, a satellite broadcast receiving converter or the like.
- Recently, there have been remarkable developments in microwave devices used in microwave communication apparatuses, and it is easy to procure low-noise devices such as HEMT and MES-FET, so that the noise factor in reception-type low-noise converters, in particular, is decreasing year after year. However, if the low-noise microwave device itself exhibits a satisfactory noise factor, the loss and impedance mismatching between the input section and the microwave device have a significant influence, making it impossible, in some cases, to obtain a desired noise factor for the low-noise converter as a whole.
- Such a conventional microwave circuit will be described with reference to the drawings.
- Fig. 7 shows a short-circuit section of a conventional cylindrical waveguide, and Fig. 8 is a sectional view of the same. In Fig. 7, numeral 1 indicates a metal body including a
cylindrical waveguide 5, andnumeral 2 indicates a mounting surface for a short-circuit plate 4. Usually, the short-circuit plate 4 is fixed to themounting surface 2 by means of screws or the like to form a short-circuit plane. If the short-circuit plate 4 is in an ideal short-circuit state, a microwave being propagated through thecylindrical waveguide 5 makes a total reflection to change the direction of propagation without involving any loss. - In the above-described construction, however, an adequate contact cannot be attained, in particular, at an end of the cylindrical waveguide due to a variation in the surface precision of the
mounting plate 2 and in the flatness of the short-circuit plate 4, with the result that the short-circuit plate 4 does not function as a perfect short-circuit plane. Thus, when using the short-circuit plane of a low-noise converter, the input power cannot be reflected adequately, resulting in deterioration in noise factor and input VSWR. - In view of the above problem, it is an object of the present invention to provide a microwave circuit in which an adequate contact is ensured between a first, external conductor including a cylindrical microwave transmission path and a second conductor having a planar configuration, and which exhibits satisfactory characteristics.
- To achieve the above object, the microwave circuit of the present invention comprises: a first metal body having a concentric-circle-like prominence provided at an end of a cylindrical microwave transmission path and extending outwardly from a cylindrical inner wall; and a second metal body having a planar configuration and held in contact with the first metal body.
- Due to the above construction of the present invention, the first metal body is held in contact with the second planar metal body solely through a small region corresponding to the prominence provided on the outside of the cylindrical inner wall thereof, thereby attaining an adequate electromagnetic contact between the two metal bodies and ensuring satisfactory characteristics.
-
- Fig. 1 is an exploded perspective view of a short-circuit section of a cylindrical waveguide according to an embodiment of the present invention;
- Fig. 2 is sectional view of the same;
- Fig. 3 is an exploded perspective view of a short-circuit section of a cylindrical waveguide according to another embodiment of the present invention;
- Fig. 4 is a sectional view of the same;
- Figs. 5 and 6 are sectional views of cylindrical-waveguide/microstrip-line conversion sections according to second and third embodiments of the present invention;
- Fig. 7 is an exploded perspective view of short-circuit section of a conventional cylindrical waveguide; and
- Fig. 8 is a sectional view of the same.
- A microwave circuit according to an embodiment of the present invention will now be described with reference to the drawings.
- Fig. 1 shows a short-circuit section of a cylindrical waveguide according to the present invention; and Fig. 2 shows a sectional view of the same. In Fig. 1, numeral 1 indicates a metal body including a
cylindrical waveguide 5, andnumeral 2 indicates a mounting surface for a short-circuit plate 4. If the short-circuit plate 4 is in an adequate short-circuit state, a microwave propagated through thecylindrical waveguide 5 makes a total reflection to change the direction of propagation without involving any loss. In this embodiment, the short-circuit plate 4 is brought into contact with a concentric-circle-like prominence 3 before it is brought into contact with themounting surface 2 at the time of mounting, so that the contact of the short-circuit plate 4 with the end surface of the inner-wall section of thecylindrical waveguide 5, which is important when realizing a short-circuit plane, can be attained in an adequate manner, thereby ensuring a satisfactory short-circuit characteristic not depending upon the surface precision of themounting surface 2. Further, since the short-circuit plate 4 is brought into contact with the inner wall of thecylindrical waveguide 5 before it is brought into contact with themounting surface 2, it is possible to realize a satisfactory short-circuit plate even if a particularly high level of flatness cannot be ensured for the short-circuit plate 4. - Another embodiment of the present invention will be described with reference to the drawings. Fig. 3 shows a short-circuit section of a cylindrical waveguide according to another embodiment of the present invention, and Fig. 4 shows a sectional view of the same.
- In Figs. 3 and 4, numeral 1 indicates a metal body including a
cylindrical waveguide 5;numeral 2 indicates a mounting surface for a short-circuit plate; andnumeral 3 indicates a concentric-circle-like prominence. In this embodiment, the sectional configuration of the concentric-circle-like prominence 3 is changed so as to facilitate the machining thereof. Like the previous embodiment, this structure is free from the influence of the surface precision of thecontact surface 2, and through the contact of the short-circuit plate 4 with the concentric-circle-like prominence 3, it is possible to ensure satisfactory characteristics for the short-circuit plane of the cylindrical waveguide. - Further, second and third embodiments of the present invention will be described with reference to the drawings. Figs. 5 and 6 show a sectional view of cylindrical-waveguide/microstrip-line conversion sections in other embodiments of the present invention.
-
Numeral 10 indicates a metal body including a cylindrical waveguide; numeral 6 indicates a post member;numeral 7 indicates an MIC substrate having a microstrip line;numeral 8 indicates a metal supporter for forming a hollow coaxial line-together with the post member 6; andnumeral 9 indicates a dielectric supporter forming a dielectric coaxial line with the post member 6. - In Figs. 5 and 6, a microwave propagated through the cylindrical waveguide in a direction perpendicular to the plane of the drawings is converted to a coaxial mode in the section of the post member 6 and propagated through coaxial lines formed by the
components MIC substrate 7 and the post member 6 to propagate the microwave through the microstrip line on theMIC substrate 7. - If, in the above waveguide/microstrip-line conversion section, the contact between the
metal spacer 8 and themetal body 10 is not adequate, discontinuous portions are present in external conductors in the coaxial lines formed by themetal spacer 8 and thedielectric supporter 9, thereby causing a loss and deterioration in VSWR during microwave propagation. In view of this, a concentric-circle-like prominence 11 is provided on the side of themetal body 10, in the case of Fig. 5, and on the side of themetal support 8, in the case of Fig. 6, thereby an adequate contact is attained in the external conductor sections of the two coaxial lines mentioned above, thus ensuring satisfactory propagating characteristics. - Thus, in accordance with the present invention, a concentric-circle-like prominence is provided on the external conductor forming one coaxial line, and brought into contact with the external conductor of the other coaxial line, thereby preventing loss and deterioration in VSWR due to the generation of discontinuous portions in the coaxial external conductors.
- Thus, in accordance with the present invention, a first metal body having a concentric-circle-like prominence at an end of a cylindrical microwave transmission path and extending outwardly from a cylindrical wall is brought into contact with a second metal body having a planar configuration, whereby any discontinuity in the external conductor sections in the microwave transmission path is eliminated and satisfactory transmission characteristics can be obtained, this providing a remarkable advantage.
-
- 1, 10
- metal body
- 2
- mounting surface
- 3, 11
- concentric-circle-like prominence
- 4
- short-circuit plate
- 5, 12
- cylindrical waveguide
- 6
- post member
- 7
- MIC substrate
- 8
- metal supporter
- 9
- dielectric supporter
Claims (1)
- A microwave circuit comprising: a first metal body whose interior is cut into a cylindrical microwave transmission path and which includes a concentric-circle-like prominence provided at an end of the microwave transmission path and extending outwardly from a cylindrical inner wall; and a second metal body which has a planar configuration, said first metal body being held in an adequate contact with said second metal body.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP233500/90 | 1990-09-03 | ||
JP2233500A JPH04113703A (en) | 1990-09-03 | 1990-09-03 | Microwave circuit |
PCT/JP1991/001171 WO1992004742A1 (en) | 1990-09-03 | 1991-09-02 | Microwave circuit |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0500949A1 true EP0500949A1 (en) | 1992-09-02 |
EP0500949A4 EP0500949A4 (en) | 1993-03-03 |
EP0500949B1 EP0500949B1 (en) | 1996-06-05 |
Family
ID=16955999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91915147A Expired - Lifetime EP0500949B1 (en) | 1990-09-03 | 1991-09-02 | Microwave circuit |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0500949B1 (en) |
JP (1) | JPH04113703A (en) |
KR (1) | KR920702561A (en) |
CA (1) | CA2067729C (en) |
DE (1) | DE69120052T2 (en) |
WO (1) | WO1992004742A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0498896A1 (en) * | 1990-08-31 | 1992-08-19 | Matsushita Electric Industrial Co., Ltd. | Microwave circuit |
EP1003236A2 (en) * | 1998-11-18 | 2000-05-24 | DaimlerChrysler AG | Device and method for producing radio frequency components |
WO2004030140A1 (en) * | 2002-09-20 | 2004-04-08 | Eads Deutschland Gmbh | Waveguide filter |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003032032A (en) * | 2001-07-11 | 2003-01-31 | Maspro Denkoh Corp | Signal receiver for antenna |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2527908A (en) * | 1946-08-28 | 1950-10-31 | Rca Corp | Microwave closure member and seal therefor |
GB1500286A (en) * | 1975-04-28 | 1978-02-08 | Decca Ltd | Circuit package |
JPS63260301A (en) * | 1987-04-17 | 1988-10-27 | Nec Corp | Coaxial waveguide converter |
EP0498896A1 (en) * | 1990-08-31 | 1992-08-19 | Matsushita Electric Industrial Co., Ltd. | Microwave circuit |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6030601B2 (en) * | 1978-10-17 | 1985-07-17 | 新明和工業株式会社 | garbage collection vehicle |
JPS6221601U (en) * | 1985-07-23 | 1987-02-09 | ||
JPH02183601A (en) * | 1989-01-10 | 1990-07-18 | Maspro Denkoh Corp | Microwave device |
-
1990
- 1990-09-03 JP JP2233500A patent/JPH04113703A/en active Pending
-
1991
- 1991-09-02 DE DE69120052T patent/DE69120052T2/en not_active Expired - Fee Related
- 1991-09-02 KR KR1019920701030A patent/KR920702561A/en not_active Application Discontinuation
- 1991-09-02 CA CA002067729A patent/CA2067729C/en not_active Expired - Fee Related
- 1991-09-02 EP EP91915147A patent/EP0500949B1/en not_active Expired - Lifetime
- 1991-09-02 WO PCT/JP1991/001171 patent/WO1992004742A1/en active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2527908A (en) * | 1946-08-28 | 1950-10-31 | Rca Corp | Microwave closure member and seal therefor |
GB1500286A (en) * | 1975-04-28 | 1978-02-08 | Decca Ltd | Circuit package |
JPS63260301A (en) * | 1987-04-17 | 1988-10-27 | Nec Corp | Coaxial waveguide converter |
EP0498896A1 (en) * | 1990-08-31 | 1992-08-19 | Matsushita Electric Industrial Co., Ltd. | Microwave circuit |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 13, no. 81 (E-719)(3429) 23 February 1989 & JP-A-63 260 301 ( NEC CORP ) 27 October 1988 * |
See also references of WO9204742A1 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0498896A1 (en) * | 1990-08-31 | 1992-08-19 | Matsushita Electric Industrial Co., Ltd. | Microwave circuit |
EP0498896A4 (en) * | 1990-08-31 | 1993-03-03 | Matsushita Electric Industrial Co., Ltd | Microwave circuit |
US5280253A (en) * | 1990-08-31 | 1994-01-18 | Matsushita Electric Industrial Co. Ltd. | Cylindrical waveguide-to-microstrip line converter |
EP1003236A2 (en) * | 1998-11-18 | 2000-05-24 | DaimlerChrysler AG | Device and method for producing radio frequency components |
WO2004030140A1 (en) * | 2002-09-20 | 2004-04-08 | Eads Deutschland Gmbh | Waveguide filter |
KR101011282B1 (en) * | 2002-09-20 | 2011-01-28 | 이에이디에스 도이치란트 게엠베하 | Waveguide filter |
Also Published As
Publication number | Publication date |
---|---|
DE69120052T2 (en) | 1997-01-23 |
DE69120052D1 (en) | 1996-07-11 |
WO1992004742A1 (en) | 1992-03-19 |
JPH04113703A (en) | 1992-04-15 |
EP0500949A4 (en) | 1993-03-03 |
KR920702561A (en) | 1992-09-04 |
CA2067729A1 (en) | 1992-03-04 |
CA2067729C (en) | 1997-02-11 |
EP0500949B1 (en) | 1996-06-05 |
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