GB1422092A - Wave-guide filters - Google Patents
Wave-guide filtersInfo
- Publication number
- GB1422092A GB1422092A GB3814173A GB3814173A GB1422092A GB 1422092 A GB1422092 A GB 1422092A GB 3814173 A GB3814173 A GB 3814173A GB 3814173 A GB3814173 A GB 3814173A GB 1422092 A GB1422092 A GB 1422092A
- Authority
- GB
- United Kingdom
- Prior art keywords
- slots
- wall
- parallel
- ferrite
- absorptive material
- 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
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/209—Hollow waveguide filters comprising one or more branching arms or cavities wholly outside the main waveguide
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
- Waveguide Aerials (AREA)
Abstract
1422092 Filters for waveguides MARCONI CO Ltd 9 Aug 1974 [11 Aug 1973] 38141/73 Heading H1W A low-pass microwave filter comprises a rectangular waveguide coupled by slots in one or both broad walls to a parallel-plate waveguide or waveguides associated with absorptive material. In the simplest form (Fig. 1, not shown), one broad wall is provided with an array of slots spaced at intervals equal to one halfwavelength of the TE 01 mode in the parallel plate waveguide at the frequency above which attenuation is desired, the length of each slot being about one half-wavelength at this frequency. A substantial proportion of the energy propagating in any TE MN mode (M#0) is radiated by the slots. In the embodiment shown, slots are provided in both broad walls resonant at harmonic frequencies, the slots 12 in the upper wall being arranged in pairs to transmit the even harmonics, and those 13 in the lower wall being arranged in groups of three to transmit the odd harmonics. The two arrays may be staggered by one quarter-wavelength to improve the VSWR. A further improvement may be obtained by a diminution of the lengths of the slots towards the two ends of the filter. The parallel-plate guides comprise two pairs of spaced conductive plates 5. The guides include elements 7 made of absorptive material, e.g. silicone rubber loaded with ferrite or a ceramic load with carbonyl iron or ferrite. The embodiment shown comprises additionally means for attenuating the TE MN (M, N#0) modes, in particular the TE ON modes not affected by the slots 12, 13. For this purpose, each narrow wall is provided with slits 14 parallel to the minor axis, each slit being of width about equal to the thickness of the wall and spaced from the next by two slit-widths. The slits are covered by absorptive material 15, e.g. ferrite-loaded silicone rubber.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3814173A GB1422092A (en) | 1973-08-11 | 1973-08-11 | Wave-guide filters |
DE19732354151 DE2354151C3 (en) | 1973-08-11 | 1973-10-29 | Waveguide filter |
US496874A US3916352A (en) | 1973-08-11 | 1974-08-12 | Waveguide filters |
IT69527/74A IT1016814B (en) | 1973-08-11 | 1974-08-12 | WAVE GUIDE FILTER |
FR7427854A FR2240535B1 (en) | 1973-08-11 | 1974-08-12 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3814173A GB1422092A (en) | 1973-08-11 | 1973-08-11 | Wave-guide filters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1422092A true GB1422092A (en) | 1976-01-21 |
Family
ID=10401479
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3814173A Expired GB1422092A (en) | 1973-08-11 | 1973-08-11 | Wave-guide filters |
Country Status (4)
Country | Link |
---|---|
US (1) | US3916352A (en) |
FR (1) | FR2240535B1 (en) |
GB (1) | GB1422092A (en) |
IT (1) | IT1016814B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2456043B (en) * | 2007-12-28 | 2011-11-30 | Furuno Electric Co | Harmonic suppression resonator, harmonic propagation blocking filter, and radar apparatus |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2826081C3 (en) * | 1978-06-14 | 1981-03-26 | Spinner GmbH Elektrotechnische Fabrik, 80335 München | RF attenuator |
US4628538A (en) * | 1985-05-13 | 1986-12-09 | Andrew Corporation | Television transmission system using overmoded waveguide |
US5004993A (en) * | 1989-09-19 | 1991-04-02 | The United States Of America As Represented By The Secretary Of The Navy | Constricted split block waveguide low pass filter with printed circuit filter substrate |
KR101330682B1 (en) * | 2011-10-26 | 2013-11-19 | 한국해양대학교 산학협력단 | Terahertz Filter |
US10249929B1 (en) * | 2016-01-29 | 2019-04-02 | The United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration | Multimode directional coupler |
US10181630B2 (en) * | 2016-08-08 | 2019-01-15 | Rohde & Schwarz Gmbh & Co. Kg | Directional coupler and a combiner |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2785381A (en) * | 1953-04-23 | 1957-03-12 | Burton P Brown | Electromagnetic wave filter |
US3187277A (en) * | 1962-05-14 | 1965-06-01 | Airtron Inc | Waveguide harmonic suppressor employing subsidiary waveguides, cut off for fundamental, for coupling main waveguide harmonics to absorber |
US3451014A (en) * | 1964-12-23 | 1969-06-17 | Microwave Dev Lab Inc | Waveguide filter having branch means to absorb or attenuate frequencies above pass-band |
US3353123A (en) * | 1965-09-01 | 1967-11-14 | Gen Electric | Microwave filter comprising absorbing structures for removing suprious wave energy |
US3464035A (en) * | 1966-07-25 | 1969-08-26 | Gerald W Van Kol | Filter coupled to microwave guide |
US3593220A (en) * | 1968-07-15 | 1971-07-13 | Varian Associates | High power microwave low-pass filter of the leaky wall type |
US3559111A (en) * | 1969-09-10 | 1971-01-26 | Kunihiro Suetake | Electric wave matching element employing a ferrite plate conductively coated on one surface |
-
1973
- 1973-08-11 GB GB3814173A patent/GB1422092A/en not_active Expired
-
1974
- 1974-08-12 IT IT69527/74A patent/IT1016814B/en active
- 1974-08-12 US US496874A patent/US3916352A/en not_active Expired - Lifetime
- 1974-08-12 FR FR7427854A patent/FR2240535B1/fr not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2456043B (en) * | 2007-12-28 | 2011-11-30 | Furuno Electric Co | Harmonic suppression resonator, harmonic propagation blocking filter, and radar apparatus |
Also Published As
Publication number | Publication date |
---|---|
DE2354151B2 (en) | 1975-10-02 |
DE2354151A1 (en) | 1975-02-27 |
US3916352A (en) | 1975-10-28 |
FR2240535B1 (en) | 1979-09-21 |
IT1016814B (en) | 1977-06-20 |
FR2240535A1 (en) | 1975-03-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |