EP0708490A1 - Antenne a structure de guide d'ondes et procede de fabrication - Google Patents

Antenne a structure de guide d'ondes et procede de fabrication Download PDF

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Publication number
EP0708490A1
EP0708490A1 EP94912057A EP94912057A EP0708490A1 EP 0708490 A1 EP0708490 A1 EP 0708490A1 EP 94912057 A EP94912057 A EP 94912057A EP 94912057 A EP94912057 A EP 94912057A EP 0708490 A1 EP0708490 A1 EP 0708490A1
Authority
EP
European Patent Office
Prior art keywords
bottom plate
sidewalls
radiation plate
plate
radiation
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.)
Withdrawn
Application number
EP94912057A
Other languages
German (de)
English (en)
Inventor
Naohisa Goto
Masaharu Nippon Steel Corporation MORIYA
Keishi Nippon Steel Corporation MATSUNO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP4336943A external-priority patent/JPH06188624A/ja
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP0708490A1 publication Critical patent/EP0708490A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H01Q21/0037—Particular feeding systems linear waveguide fed arrays
    • H01Q21/0043—Slotted waveguides
    • H01Q21/005—Slotted waveguides arrays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0087—Apparatus or processes specially adapted for manufacturing antenna arrays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/062—Two dimensional planar arrays using dipole aerials

Definitions

  • the present invention relates to an antenna of a waveguide structure and a method of manufacturing the same, and more particularly to an antenna of a leaky waveguide structure and a method of manufacturing the same.
  • An antenna of a waveguide structure is generally known as an example of an antenna used for receiving satellite broadcasting.
  • This antenna is provided with a radiation plate, in which slots are formed at predetermined intervals for performing transmission-reception of electromagnetic waves in a band having a central frequency of 11.85 GHz efficiently, and a plurality of parallel waveguides provided under the radiation plate for transmitting the electromagnetic waves.
  • An antenna of a leaky waveguide structure that is a sort of the antenna described above is constructed of a main body and a radiation plate made of a metal such as aluminum or copper.
  • the main body includes one flat bottom plate and a plurality of elongated rectangular sidewalls fixed perpendicularly to the bottom plate.
  • the radiation plate is made of a flat plate and arranged in parallel to the bottom plate with a given distance therebetween so as to provide a space between one surface of the bottom plate and one surface of the radiation plate.
  • the plurality of sidewalls serve as partitions for separating the space into one elongated feed waveguide and a plurality of parallel radiation waveguides, each conducting at its one end with the feed waveguide.
  • each sidewall is fixed to the one surface of the bottom plate, and an opposite side thereof is fixed to the one surface of the radiation plate so that the one feed waveguide and the plurality of radiation waveguides separated by the sidewalls are formed in the space between the bottom plate and the radiation plate. Further, a plurality of slots are formed at a part of the surface of the radiation plate facing to each radiation waveguide.
  • each sidewall has to be made thicker sufficiently to provide a space for screw clamping or riveting and to prevent distortion caused by clamping force thereof.
  • the radiation plate has also to be made thicker for security of the strength in screw clamping or the like and prevention of distortion. For reason of the foregoing, the antenna becomes expensive and the weight thereof is increased. As a result, it becomes difficult to obtain desired performance of the antenna.
  • an antenna of a waveguide structure includes a flat thin metallic bottom plate; a flat thin metallic radiation plate arranged in parallel to the bottom plate with a certain interval from the bottom plate so as to provide a space between the bottom plate and the radiation plate; and a plurality of flat and thin metallic sidewalls disposed in the space and fixed to the bottom plate and the radiation plate so as to separate the space between the bottom plate and the radiation plate into a plurality of waveguides conducting with one another; wherein the radiation plate is joined to the plurality of sidewalls by a plurality of spot welds at predetermined intervals.
  • an antenna of a waveguide structure includes a flat thin metallic bottom plate; a flat thin metallic radiation plate arranged in parallel to the bottom plate with an interval from the bottom plate so as to provide a space between the bottom plate and the radiation plate; and a plurality of flat and thin metallic sidewalls disposed in the space and fixed to the bottom plate and the radiation plate so as to separate the space between the bottom plate and the radiation plate into a plurality of waveguides conducting with one another; wherein the plurality of sidewalls are formed into a single block of metallic material integrally with the bottom plate.
  • a method of manufacturing an antenna of a waveguide structure which includes a flat thin metallic bottom plate; a flat thin metallic radiation plate arranged in parallel to the bottom plate with an interval from the bottom plate so as to provide a space between the bottom plate and the radiation plate; and a plurality of flat and thin metallic sidewalls arranged in the space and fixed to the bottom plate and the radiation plate so as to separate the space between the bottom plate and the radiation plate into a plurality of waveguides conducting with one another, includes the step of joining the radiation plate to each of the plurality of sidewalls by laser welding.
  • a method of manufacturing an antenna of a waveguide structure which includes a flat thin metallic bottom plate; a flat thin metallic radiation plate arranged in parallel to the bottom plate with a certain interval from the bottom plate so as to provide a space between the bottom plate and the radiation plate; and a plurality of flat and thin metallic sidewalls disposed in the space and fixed to the bottom plate and the radiation plate so as to separate the space between the bottom plate and the radiation plate into a plurality of waveguides conducting with one another, includes the step of forming the bottom plate and the plurality of sidewalls fixed to the bottom plate in a form of a single block of metallic material.
  • Aluminum, copper or the like is used as the material of a main body including the bottom plate and a plurality of sidewalls and that of the radiation plate.
  • aluminum is preferred in its workability and electrical characteristics.
  • a solid-state laser such as YAG laser and ruby laser is suitable for laser welding. Spot welding performed at a predetermined pitch is desired for laser welding. In this case, it is desired to set the pitch of the spot welding to 1/10 or less of the wavelength of the used electromagnetic wave (2.6 mm or less in the case of 11.85 GHz). This is because the substantially same effect as that obtained in continuous welding can be obtained.
  • the main body is preferably produced by casting.
  • the main body is produced by casting, it is possible to make the main body highly in precise at a low price.
  • a die casting method, a lost wax method, a shell mold method or the like is suitable as the casting method.
  • the laser welding is performed from the top surface of the radiation plate, welding workability is excellent.
  • the laser welding is performed while forming a conical dent in advance at each welding position by punching or the like, it is possible to save the necessary power of laser and also to prevent excessive welding metal from swelling on a radiation surface.
  • the maximum diameter and the depth of the dent are suitably about 1/3 to 1/2 and 1/4 to 1/2 of the thickness of the radiation plate, respectively.
  • Fig. 1 is a perspective view showing an exterior configuration of an antenna of a leaky waveguide structure according to an embodiment of the present invention.
  • the external appearance of an antenna of a waveguide structure according to the present invention is not different basically from a conventional unit.
  • an antenna 1 of a waveguide structure is manufactured with a main body 2 and a radiation plate 5 made of a metallic material such as aluminum or copper.
  • the main body 2 includes a flat bottom plate 3 and a plurality of sidewalls 4A, 4B and 4C each being formed of a substantially rectangular elongated thin plate.
  • the bottom plate 3 and the sidewalls 4A, 4B and 4C are made of aluminum integrally in one block by casting, e.g. by a die casting method.
  • Each sidewall includes upper and lower sides 4a and 4b parallel to a longitudinal direction, and the lower side 4b is integrally connected to the bottom plate 3 so as to hold the sidewall perpendicular to the bottom plate.
  • the sidewalls 4A are arranged parallel to one another, and include long sidewalls and short sidewalls disposed alternately one another.
  • the sidewalls 4B are arranged along a traverse direction at a right angle to the longitudinal direction of each sidewall 4A with predetermined intervals between them, and the central part of each sidewall 4B is integrally connected to an end portion of the elongated sidewall 4A.
  • the sidewall 4C is arranged parallel to the sidewalls 4B.
  • the radiation plate 5 is made of a flat plate of aluminum and arranged parallel to the bottom plate 3 so as to provide a space between the bottom plate 3 and the radiation plate 5.
  • One surface of the radiation plate 5 is fixed to the upper sides 4a of the sidewalls 4A, 4B and 4C at a plurality of points by spot welding. With this, the space between the bottom plate 3 and the radiation plate 5 is separated by the sidewalls into a plurality of waveguides communicated mutually with each other and disposed in predetermined pattern.
  • radiation waveguides 7A parallel to one another are formed each defined by two adjacent sidewalls 4A, the bottom plate 3 and the radiation plate 5, and a feed waveguide 7B extending in a direction at a right angle with the radiation waveguides is formed between the sidewalls 4B and the sidewall 4C.
  • the feed waveguide 7B is branched into adjacent two of the radiation waveguides 7A through each gap 18, thus forming a ⁇ branch.
  • Cross slots 6 are formed at a part of the radiation plate 5 facing to each of the radiation waveguides 7A with predetermined intervals in the longitudinal direction of the waveguide.
  • inductive posts 10 are provided at positions on the bottom plate 3 facing to the feed waveguide 7B corresponding to the ⁇ branches.
  • These posts 10 are made of aluminum integrally with the bottom plate 3.
  • the radiation waveguide, the feed waveguide, the inductive post, the ⁇ branch and the cross slot described above are all well known. Since detailed description thereof is made in the document (4) mentioned above, it is requested to refer to the same.
  • the thickness of the bottom plate 3 is 1.5 mm, and the thickness of the radiation plate 5 is 0.3 mm.
  • Each of the sidewalls 4A, 4B and 4C has a thickness of 1.0 mm, and a height, i.e., the distance between parallel sides 4a and 4b of 4.0 mm. Further, the distance between adjacent two sidewalls 4A, i.e., the width of the radiation waveguide 7A is 17 mm, and the distance between the sidewall 4B and the sidewall 4C, i.e., the width of the feed waveguide 7B is 34 mm.
  • the spot welding between the upper side 4a of each sidewall and the radiation plate 5 is made preferably by laser spot welding.
  • the upper surface of the radiation plate 5 is irradiated with energy of 8 joules (Kw-msec) of YAG laser having the wavelength of 1.06 ⁇ m, thereby to spot weld the radiation plate to the upper side of the sidewall at intervals of 2.5 mm pitch.
  • the part irradiated with laser is melt so as to form a weld metal 8 thereby connecting fixedly the upper side 4a of the sidewall 4A to the radiation plate 5.
  • Fig. 5 shows a typical section of a weld when welding is made by another spot welding method.
  • a dent 9 having a conical section is formed by punching in advance at an upper portion of the radiation plate 5 opposite to the spot-welding position and the spot-welding is applied to the portion of the dent 9.
  • the applied power of the laser is saved, and it is possible to prevent excessive weld metal 8 from swelling on the upper surface of the radiation plate as shown in Fig. 4.
  • an antenna 11 of a waveguide structure also includes a main body 12 and a radiation plate 15 made principally of aluminum like the embodiment shown in Fig. 1 and Fig. 2.
  • the main body 12 is provided with a flat bottom plate 13 and a plurality of substantially rectangular elongated thin sidewalls 14A, 14B and 14C.
  • the bottom plate 13 and the sidewalls 14A, 14B and 14C are made of aluminum in one block by casting, e.g., by a die casting method.
  • Each sidewall includes upper and lower sides 14a and 14b parallel to each other in the longitudinal direction, and the lower side 14b is integrally connected to the bottom plate 13 in a block so as to hold the sidewall perpendicular to the bottom plate.
  • the sidewalls 14A are arranged parallel to one another in the longitudinal direction with predetermined intervals, as shown in Fig. 7.
  • the sidewalls 14B are arranged along direction at a right angle to the longitudinal direction of the sidewalls 14A with predetermined gaps 20 therebetween.
  • the central part of each sidewall 14B is integrally fixed to the end portion of one sidewall 14A.
  • the sidewall 14C is arranged parallel to the sidewalls 14B.
  • the radiation plate 15 is made of a flat aluminum plate and arranged parallel to the bottom plate 13, and one surface thereof is fixed to the upper sides 14a of the sidewalls 14A, 14B and 14C by spot welding.
  • a radiation waveguide 17A is defined by adjacent two sidewalls 14A, the bottom plate 13 and the radiation plate 15, and a feed waveguide 17B is formed between the sidewalls 14B and the sidewall 14C.
  • the feed waveguide 17B is communicated with the radiation waveguides 17A through gaps 20, respectively.
  • Cross slots 16 are formed at predetermined intervals along two lines in the longitudinal direction of the waveguide at a part of the radiation plate 15 facing to each radiation waveguide 17A.
  • the thickness of the bottom plate 13 is 1.5 mm, and the thickness of the radiation plate 15 is 0.3 mm.
  • Each of the sidewalls 14A, 14B and 14C has a thickness of 1.0 mm, and a height, i.e., the distance between parallel sides 14a and 14b is 4.0 mm. Further, the distance between adjacent two sidewalls 14A, i.e., the width of the waveguide 17A, and the distance between the sidewall 14B and the sidewall 14C, i.e., the width of the waveguide 17B are both 17 mm.
  • the spot welding between the upper side 14a of each sidewall and the radiation plate 15 is made preferably by laser spot welding.
  • the top surface of the radiation plate 15 is irradiated with a YAG laser beam having a wavelength of approximately 1.06 ⁇ m at energy of approximately 8 joules (Kw-msec), thereby to spot weld the radiation plate to the upper side of the sidewall at intervals of 2.5 mm pitch.
  • an antenna of a waveguide structure and a method of manufacturing the same since the sidewalls and the radiation plate are connected fixedly to each other by laser welding, it is possible to connect the main body and the radiation plate fixedly to each other with a small amount of weld metal. Accordingly, production steps are reduced and the sidewalls and the radiation plate can be made thinner as compared with a conventional method such as screw clamping, so that it is possible to make a lightweight antenna at a low price. Further, since the sidewalls are formed thin with less deformation in connection between the sidewalls and the radiation plate, the flatness of the internal surface of the waveguide is high and the transmission loss of the electromagnetic wave is small.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP94912057A 1992-12-17 1994-04-06 Antenne a structure de guide d'ondes et procede de fabrication Withdrawn EP0708490A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP4336943A JPH06188624A (ja) 1992-12-17 1992-12-17 導波管構造のアンテナおよびその製造方法
PCT/JP1994/000570 WO1995028012A1 (fr) 1992-12-17 1994-04-06 Antenne a structure de guide d'ondes et procede de fabrication
CA002140360A CA2140360C (fr) 1992-12-17 1994-04-06 Antenne a structure de guide d'ondes et procede de fabrication

Publications (1)

Publication Number Publication Date
EP0708490A1 true EP0708490A1 (fr) 1996-04-24

Family

ID=27169934

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94912057A Withdrawn EP0708490A1 (fr) 1992-12-17 1994-04-06 Antenne a structure de guide d'ondes et procede de fabrication

Country Status (3)

Country Link
EP (1) EP0708490A1 (fr)
CA (1) CA2140360C (fr)
WO (1) WO1995028012A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1447880A1 (fr) * 2001-11-20 2004-08-18 Anritsu Corporation Radiateur de type a fentes a guide d'ondes ayant une construction facilitant sa production
US20220200160A1 (en) * 2020-12-18 2022-06-23 Aptiv Technologies Limited Waveguide End Array Antenna to Reduce Grating Lobes and Cross-Polarization

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6113802A (ja) * 1984-06-29 1986-01-22 Fujitsu Ltd 溝形成方法
JPS6291004A (ja) * 1985-10-16 1987-04-25 Matsushita Electric Ind Co Ltd 矩形導波管
AU4841790A (en) * 1988-12-19 1990-07-10 Hughes Aircraft Company Ultralight microwave antenna and method of fabrication
JPH0365805A (ja) * 1989-08-03 1991-03-20 Sumitomo Bakelite Co Ltd 導波管アンテナ
JPH03224306A (ja) * 1990-01-30 1991-10-03 Asahi Chem Ind Co Ltd 導波管および導波管スロットアンテナ
JPH0425206A (ja) * 1990-05-18 1992-01-29 Nec Corp フィード導波管製造方法
JPH04218300A (ja) * 1990-10-31 1992-08-07 Furukawa Electric Co Ltd:The 超電導加速管及びその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9528012A1 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1447880A1 (fr) * 2001-11-20 2004-08-18 Anritsu Corporation Radiateur de type a fentes a guide d'ondes ayant une construction facilitant sa production
EP1447880A4 (fr) * 2001-11-20 2005-04-20 Anritsu Corp Radiateur de type a fentes a guide d'ondes ayant une construction facilitant sa production
US6995724B2 (en) 2001-11-20 2006-02-07 Anritsu Corporation Waveguide slot type radiator having construction to facilitate manufacture
US20220200160A1 (en) * 2020-12-18 2022-06-23 Aptiv Technologies Limited Waveguide End Array Antenna to Reduce Grating Lobes and Cross-Polarization
US11626668B2 (en) * 2020-12-18 2023-04-11 Aptiv Technologies Limited Waveguide end array antenna to reduce grating lobes and cross-polarization

Also Published As

Publication number Publication date
CA2140360C (fr) 1998-05-12
WO1995028012A1 (fr) 1995-10-19
CA2140360A1 (fr) 1995-10-07

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