EP0040005B1 - A waveguide and a method of making the same - Google Patents
A waveguide and a method of making the same Download PDFInfo
- Publication number
- EP0040005B1 EP0040005B1 EP19810301701 EP81301701A EP0040005B1 EP 0040005 B1 EP0040005 B1 EP 0040005B1 EP 19810301701 EP19810301701 EP 19810301701 EP 81301701 A EP81301701 A EP 81301701A EP 0040005 B1 EP0040005 B1 EP 0040005B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- projection
- waveguide
- piece
- groove
- waveguides
- 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.)
- Expired
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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
Definitions
- This invention relates to waveguides. It arose in the design and manufacture of a squintless antenna having a plurality of waveguides leading to an array of radiating apertures.
- a squintless antenna is an antenna in which radiation is fed to an array of radiating positions in such a way that it arrives at each of those positions at the same phase.
- the inventor has found that this problem is accentuated when the antenna is designed to operate at high frequencies, e.g. in the J band.
- the small diameter means that the tool is liable to flex in operation and this leads to inaccuracies in the surfaces of the grooves. It is not just the diameter of the tool which is relevant but the relationship between the diameter and the length, the minimum possible length of the tool being dictated by the depth of the groove required.
- rectangular waveguides for J band operation might typically be one millimeter wide and ten millimeters deep. Using the conventional technique described above this would mean machining grooves one millimeter wide and five millimeters deep.
- This invention provides a method of making a waveguide in which a groove having a base and two sides is formed in one piece of material, a projection is formed on another piece of material and the projection is then fitted into the groove so as to form the waveguide between a side of the projection and a side of the groove.
- the invention also provides apparatus comprising a waveguide formed between a side of a groove having a base and two sides in one piece of material and a side of a projection having an end face and two sides on another piece of material, the projection fitting in the groove.
- the antenna is formed from first, second and third pieces of conductive material, e.g., brass or aluminium.
- the first piece 1 of material is machined with a number of grooves 4 of various different lengths and extending generally parallel to each other as shown.
- Each groove 4 has, at its base, a portion of reduced width forming a slot 5.
- These slots 5 may be machined before or after machining of the rest of the grooves 4 using a tool of narrower diameter. Alternatively, a specially shaped tool having a narrower diameter at its free end could be used.
- a flange 6 is defined between each pair of adjacent grooves 4 . It will be noted that the grooves 4 are not straight. Each has a bend 7 and a bend 8.
- the second piece 2 of material has features 4A, 5A, 6A, 7A and 8A corresponding to 4, 5, 6, 7 and 8.
- the flanges 6A form projections which fit snugly into the slots 5.
- the parts 1 and 2 have respective rebates 9 and 9A and these co-operate with the third piece 3 of material as will now be explained.
- the piece 3 of material is machined so as to form a channel 10 which tapers from a relatively deep end 11 to a relatively shallow end 12.
- Rebates 13 form lips 14 which fit into the rebates 9 and 9A of the respective parts 1 and 2.
- each side of each projection 6A co-operates with an adjacent side of a flange 6 to form a waveguide of width W.
- This width W is much smaller than the diameter of the tool needed to machine the various grooves and slots which have been referred to previously. It is thus possible by employing the invention to produce narrow waveguides of great accuracy and high surface finish.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Waveguide Aerials (AREA)
- Waveguides (AREA)
Description
- This invention relates to waveguides. It arose in the design and manufacture of a squintless antenna having a plurality of waveguides leading to an array of radiating apertures. A squintless antenna is an antenna in which radiation is fed to an array of radiating positions in such a way that it arrives at each of those positions at the same phase.
- Squintless antennae for operation in the L and S band of frequencies have been made in the past by machining grooves in two sheets or plates of conductive material. These sheets are then fitted together, one on top of the other, so that each groove in one sheet co-operates with a corresponding groove in the other sheet to form one of the waveguides. A problem has arisen in machining the grooves since it is necessary that their dimensions be defined within small tolerances.
- The inventor has found that this problem is accentuated when the antenna is designed to operate at high frequencies, e.g. in the J band. This is because the waveguides need to be correspondingly narrower. They therefore need to be machined using an end mill or other tool of relatively small diameter. The small diameter means that the tool is liable to flex in operation and this leads to inaccuracies in the surfaces of the grooves. It is not just the diameter of the tool which is relevant but the relationship between the diameter and the length, the minimum possible length of the tool being dictated by the depth of the groove required. As an example, rectangular waveguides for J band operation might typically be one millimeter wide and ten millimeters deep. Using the conventional technique described above this would mean machining grooves one millimeter wide and five millimeters deep.
- This invention provides a method of making a waveguide in which a groove having a base and two sides is formed in one piece of material, a projection is formed on another piece of material and the projection is then fitted into the groove so as to form the waveguide between a side of the projection and a side of the groove.
- The invention also provides apparatus comprising a waveguide formed between a side of a groove having a base and two sides in one piece of material and a side of a projection having an end face and two sides on another piece of material, the projection fitting in the groove.
- One way in which the invention may be performed will now be described with reference to the accompanying drawings in which:-
- Figure 1 is an exploded perspective view of a squintless antenna constructed in accordance with the invention; and
- Figure 2 is a perspective view of the antenna shown in Figure 1 viewed from the direction indicated by arrow A on Figure 1.
- Referring firstly to Figure 1, the antenna is formed from first, second and third pieces of conductive material, e.g., brass or aluminium. The
first piece 1 of material is machined with a number of grooves 4 of various different lengths and extending generally parallel to each other as shown. Each groove 4 has, at its base, a portion of reduced width forming aslot 5. Theseslots 5 may be machined before or after machining of the rest of the grooves 4 using a tool of narrower diameter. Alternatively, a specially shaped tool having a narrower diameter at its free end could be used. Between each pair of adjacent grooves 4 aflange 6 is defined. It will be noted that the grooves 4 are not straight. Each has a bend 7 and abend 8. - The second piece 2 of material has features 4A, 5A, 6A, 7A and 8A corresponding to 4, 5, 6, 7 and 8. The
flanges 6A form projections which fit snugly into theslots 5. - The
parts 1 and 2 have respective rebates 9 and 9A and these co-operate with the third piece 3 of material as will now be explained. - The piece 3 of material is machined so as to form a
channel 10 which tapers from a relatively deep end 11 to a relativelyshallow end 12. Rebates 13 form lips 14 which fit into the rebates 9 and 9A of therespective parts 1 and 2. When theparts 1, 2 and 3 are assembled, as shown in Figure 2, the taper of thechannel 10 serves to distribute microwave energy introduced through the end 11 of thechannel 10 evenly into each of the waveguides formed by theparts 1 and 2. - Referring now to Figure 2, this shows the
parts 1 and 2 fitted together and it can be seen that each side of eachprojection 6A co-operates with an adjacent side of aflange 6 to form a waveguide of width W. This width W is much smaller than the diameter of the tool needed to machine the various grooves and slots which have been referred to previously. It is thus possible by employing the invention to produce narrow waveguides of great accuracy and high surface finish. - It will be apparent that the invention is applicable to non-squintless feeds and to other type of apparatus besides the squintless feed illustrated. It could for example be employed in the manufacture of diverging and/or tapered waveguides as might be used in an organpipe scanner.
Claims (14)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8015570 | 1980-05-10 | ||
GB8015570A GB2076230B (en) | 1980-05-10 | 1980-05-10 | A waveguide and a method of making the same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0040005A1 EP0040005A1 (en) | 1981-11-18 |
EP0040005B1 true EP0040005B1 (en) | 1983-05-11 |
Family
ID=10513349
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19810301701 Expired EP0040005B1 (en) | 1980-05-10 | 1981-04-16 | A waveguide and a method of making the same |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0040005B1 (en) |
DE (1) | DE3160263D1 (en) |
GB (1) | GB2076230B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2083035C1 (en) * | 1995-06-05 | 1997-06-27 | Александр Данилович Христич | High-frequency planar-array antenna |
US8558746B2 (en) | 2011-11-16 | 2013-10-15 | Andrew Llc | Flat panel array antenna |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1036025A (en) * | 1951-04-23 | 1953-09-02 | Csf | Symmetrical interdigital line for wave propagation tubes |
US4041350A (en) * | 1974-11-14 | 1977-08-09 | Tokyo Shibaura Electric Co., Ltd. | Magnetron anode and a method for manufacturing the same |
FR2405559A1 (en) * | 1977-10-07 | 1979-05-04 | Cit Alcatel | BRANCHED WAVEGUID COUPLER |
-
1980
- 1980-05-10 GB GB8015570A patent/GB2076230B/en not_active Expired
-
1981
- 1981-04-16 DE DE8181301701T patent/DE3160263D1/en not_active Expired
- 1981-04-16 EP EP19810301701 patent/EP0040005B1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB2076230A (en) | 1981-11-25 |
EP0040005A1 (en) | 1981-11-18 |
GB2076230B (en) | 1983-11-16 |
DE3160263D1 (en) | 1983-06-16 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AK | Designated contracting states |
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17P | Request for examination filed |
Effective date: 19811012 |
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ITF | It: translation for a ep patent filed |
Owner name: JACOBACCI & PERANI S.P.A. |
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