GB590302A - Mode filters for electromagnetic waves - Google Patents
Mode filters for electromagnetic wavesInfo
- Publication number
- GB590302A GB590302A GB9636/45A GB963645A GB590302A GB 590302 A GB590302 A GB 590302A GB 9636/45 A GB9636/45 A GB 9636/45A GB 963645 A GB963645 A GB 963645A GB 590302 A GB590302 A GB 590302A
- Authority
- GB
- United Kingdom
- Prior art keywords
- waves
- slots
- slot
- load
- wave
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
- H01P1/162—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion absorbing spurious or unwanted modes of propagation
Landscapes
- Waveguide Aerials (AREA)
Abstract
590,302. Wave guides. WESTERN ELECTRIC CO., Inc. April 17, 1945, No. 9636. Convention date, April 28, 1944. [Class 40 (v)] In a wave guide transmission system, Fig. 1 shows a filter for removing TE waves from a mixed source 6 of TE and TM waves feeding a TM load 7 through a wave guide 8. The middle section of the wave guide is enlarged at 18 and is formed with radial slots 9 arranged 90 degrees apart. The slots are an odd number of quarter wavelengths deep and the openings 17 into the guide are about one wavelength long and one-sixteenth wavelength wide. Thus, only the TM waves which have no transverse current component are not attenuated by the slots 9 and pass to load 7. The slots 9 may be filled with dissipative material such as graphite held in a binder such' as plaster of paris. Fig. 3 shows a modification for removing from a mixed source 21 all waves having a longitudinal component of current, and feeding TE waves to a load 22. The filter comprises an annular quarter-wave slot 24 formed in enlarged section 23 so as to attenuate longitudinal currents. The width W of the slot is about one-sixteenth of a wavelength. The slot may be filled with dissipative material. The filters may also be applied to the outer conductor of a coaxial line.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US590302XA | 1944-04-28 | 1944-04-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB590302A true GB590302A (en) | 1947-07-14 |
Family
ID=22020363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9636/45A Expired GB590302A (en) | 1944-04-28 | 1945-04-17 | Mode filters for electromagnetic waves |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB590302A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2644889A (en) * | 1950-02-14 | 1953-07-07 | Polytechnic Res And Dev Compan | Mode suppressor for external cavity klystron oscillators |
| US3441793A (en) * | 1966-07-08 | 1969-04-29 | Sfd Lab Inc | Reverse magnetron having a circular electric mode purifier in the output waveguide |
| US3471744A (en) * | 1967-09-01 | 1969-10-07 | Varian Associates | Coaxial magnetron having a segmented ring slot mode absorber |
| WO2009030778A1 (en) * | 2007-09-06 | 2009-03-12 | Becker Technologies Gmbh | Shielding device for electromagnetic radiation |
-
1945
- 1945-04-17 GB GB9636/45A patent/GB590302A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2644889A (en) * | 1950-02-14 | 1953-07-07 | Polytechnic Res And Dev Compan | Mode suppressor for external cavity klystron oscillators |
| US3441793A (en) * | 1966-07-08 | 1969-04-29 | Sfd Lab Inc | Reverse magnetron having a circular electric mode purifier in the output waveguide |
| US3471744A (en) * | 1967-09-01 | 1969-10-07 | Varian Associates | Coaxial magnetron having a segmented ring slot mode absorber |
| WO2009030778A1 (en) * | 2007-09-06 | 2009-03-12 | Becker Technologies Gmbh | Shielding device for electromagnetic radiation |
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