US2527619A - Electrical resonator and mode suppressor therefor - Google Patents
Electrical resonator and mode suppressor therefor Download PDFInfo
- Publication number
- US2527619A US2527619A US687549A US68754946A US2527619A US 2527619 A US2527619 A US 2527619A US 687549 A US687549 A US 687549A US 68754946 A US68754946 A US 68754946A US 2527619 A US2527619 A US 2527619A
- Authority
- US
- United States
- Prior art keywords
- resonator
- mode
- oscillations
- nodal
- energy
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/06—Cavity resonators
Definitions
- FIG. 2 H. B- BREHM ETAL Oct. 31, 1950 ELECTRICAL RESONATOR AND MODE SUPPRESSOR THEREFOR Filed Aug. 1, 1946 TEo/a FIG. 2
- This invention relates to cavity resonators and 'more particularly to the suppression of undesired modes of oscillation in such resonators.
- An object of the invention is to increase the Q of a cavity resonator.
- Another object of the invention is to increase the discrimination against unwanted modes of oscillation in a cavity resonator.
- a stillfurther object is to substantially dissipate the energy of one of the naturalresonance modes of a cavity resonator while, at the same time, causing little or substantially no loss of the energy of another natural resonance mode of the same frequency.
- a tunable cavity resonator may comprise a cylindrical chamber having its interior surface coated with highly electrically conductive material and with a tuning piston having its interior surface similarly coated at oneend.
- Input and output energy transfer devices may be provided at the opposite end of the resonator;
- the resonator may be designed to operate in TEom mode with nodal planes at equally spaced positions between the ends and parallel to them.
- a thin vane or plate of dielectric material may be mounted within the chamber adjacent each of one or more nodal planes and each dielectric plate may bear a coating of energy dissipating material such as aquadag which maybe nicely located at substantially a nodal plane for the desired TEOln mode oscillations.
- the energy dissipation device may have a fixed support but where a considerable'range of tuning is desired the energy dissipatin device may be mounted on supports which are capable of positional adjustment in the direction parallel to the motion of the piston.
- the energy dissipator which 'is particularly effective for suppression of oscillations of TM01 mode which involve an electrical vector parallel to the longitudinal axis of the cylinder, that is, to the direction of motionof the piston,
- dissipation may be efiected'by narrow slots or.
- Fig. 2 is a cross-section of the structure of Fig. 1 Viewed in the direction of the arrows along the plane 22;
- Fig. 3 illustrates a modification of the structure of Fig. l in which the energy dissipators at nodal planes take the form of electromagnetic leaks;
- the cylinder of the cavity resonator It and the cover I2 may consist of electrically conducting material such as aluminum or copper.
- the interior surface of the cylindrical member of the resonator I i! may be coated with any highly conductive coating such as silver or electrolytically deposited copper, as indicated at I3.
- Both the cylindrical member It and the cover' I2 may be made of any suitable rigid non-conducting material if provided with the interior electrically conducting coating. 7
- the resonator may be provided with input and output connections as, for example, coaxial end loop structures I4 and I5 each of which terminates in a soldered connection on the inside of the resonator.
- the loops l4 and I5 are preferably arranged to pass through circumferential slots I6 and Il extending through the lower end II of the resonator and arranged diametrically opposite each other tangential to a circle in the; region of a strong electric vector for oscillations of the TEOIS mode at which the resonator is to operate.
- a tuning piston I 8 supported by a plunger I9 passing through the guide 29.
- a fiat stiff spring 2! Connected in a slot at the upper end'of the plunger I9 is a fiat stiff spring 2!, to the upper end of which is attached a slotted cross-head member 22 pivotally con-I nected at 23 to the outer end of a crank arm 24, the inner end of which is fixed to a shaft 25 supported on a frame 26 mounted on thecover plate I2,
- a wormwheel 3 2'! which cooperates with a worm 23 integral with and rotated by the knob 29 and spindle 3U.
- knob 29 it is possible to place the piston l8 at any position within a desired range and to tune the interior space of the resonator l so that it may have a natural resonance frequency at a TEo,1,s mode at any point within a desired range of tuning.
- These supports 38, 39 and 40 may be placed in the region of a nodal plane.
- These supports may have slotted inner ends which closely engage and hold in fixed position a very thin fiat annulus 4! of dielectric material such as"polystyrene.
- the dissipator may advantageously be located at the nodal plane nearest the fixed end as, for example, dissipator 43 at plane 33 for the reason that the displacement of the nodal plane with change in tuning is least near the fixed end of the resonator.
- Th plane 33 selected may be that at which the node occurs for oscillations of the desired mode at the mid-frequency of the band over which tuning is to occur. If additional attenuation is desirable dissipators may be placed at both the first and second nodal plane as illustrated at 4! and 43 in Fig. 1. If, however, the energy transfer connections are to be made through side openings in the wall of the resonator it may be.
- An alternative structure involves use of supporting pins having dielectric tips and replacement of the dielectric annulus by a very thin metal plate. It has been found that this structure may very effectively suppress oscillations of unwanted modes if first it be coated with a dielectric material such as collodion and then with a coating of aquadag or other energy dissipating substance which is insulated from the metal plate by the dielectric coating. In this instance the design should be such as to place th energy dissipating coating as nearly as possible at the nodal plane for oscillations of the desired mode.
- the attenuation for undesired oscillations of all types having an electric vector in either of these nodal planes may be made relatively high without, however, producing excessive attenuation of the oscillations of the desired mode since for the desired mode the electric field at these nodal or energy dissipating planes may be of very small or negligible intensity.
- Fig. 5 discloses a modification of the structure of Fig. l in which annular dielectric plates 56, coated with energy dissipating material, are mounted at one or more of the nodal planes for oscillations of the desired mode.
- the structure differs from that of Fig. 1 in that in lieu of the fixed pin supports there are provided pins 51 which similarly support the dielectric discs but are movable in a direction parallel to the longitudinal axis of the resonator. This is accomplished by passing the pins 51 through narrow vertical slots 58 in the wall of the resonator and through holes in which the pins closely fit in an external clamping ring 59.
- the clamping ring fits tightly over the slots 58 and effectively shields them against transfer of energy either into or out from the resonator.
- the ring 59 terminates in flanges 60 and 61 which may be drawn together with bolt and wing nuts 52 thus fixing the position of the clamping ring.
- a hollow cavity resonator of high Q having a movable end wall for tuning over a frequency range, means for excitin a desired 'IEbm electromagnetic mode of oscillation therein, and a thin plate of lossy material located in a nodal plane for the desired TEOln mode oscillations of the mid-frequency of the tuning band, said plate extending into a region of high field intensity of extraneous modes, and being located remote from said end wall, and a movable support for said plate mounted on a side wall to adjust the longitudinal position of said plate in parallelism to said end wall and to maintain it in the nodal plane as the tuning of the resonator is varied.
- a cylindrical hollow cavity resonator of high Q having a fixed end plate, means for exciting a desired TEOln electromagnetic mode of oscillation within the cavity resonator, and thin circular discs of lossy material located in parallel nodal planes for the 'IEom mode and extending into a region of high field intensity of extraneous modes, said discs being equispaced, and mounted on the side walls of said resonator.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE471382D BE471382A (sh) | 1946-08-01 | ||
US687549A US2527619A (en) | 1946-08-01 | 1946-08-01 | Electrical resonator and mode suppressor therefor |
FR943059D FR943059A (fr) | 1946-08-01 | 1947-03-12 | Résonateur à cavité |
GB17688/47A GB639008A (en) | 1946-08-01 | 1947-07-04 | Improvements in cavity resonators |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US687549A US2527619A (en) | 1946-08-01 | 1946-08-01 | Electrical resonator and mode suppressor therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
US2527619A true US2527619A (en) | 1950-10-31 |
Family
ID=24760850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US687549A Expired - Lifetime US2527619A (en) | 1946-08-01 | 1946-08-01 | Electrical resonator and mode suppressor therefor |
Country Status (4)
Country | Link |
---|---|
US (1) | US2527619A (sh) |
BE (1) | BE471382A (sh) |
FR (1) | FR943059A (sh) |
GB (1) | GB639008A (sh) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2587055A (en) * | 1946-12-06 | 1952-02-26 | Bell Telephone Labor Inc | Electrical cavity resonator for microwaves |
US2593155A (en) * | 1947-03-07 | 1952-04-15 | Bell Telephone Labor Inc | Cavity resonator |
US2684469A (en) * | 1949-06-23 | 1954-07-20 | Sperry Corp | Mode selective attenuator |
US2747098A (en) * | 1952-02-04 | 1956-05-22 | Hewlett Packard Co | High frequency oscillator and resonator |
US2760171A (en) * | 1951-04-20 | 1956-08-21 | Bell Telephone Labor Inc | Wave-guide mode filter |
US2903657A (en) * | 1953-12-10 | 1959-09-08 | Siemens Ag | Wave conductor, particularly for travelling wave tubes |
US2916659A (en) * | 1956-02-24 | 1959-12-08 | Sperry Rand Corp | Electron beam forming apparatus |
US3458808A (en) * | 1964-05-29 | 1969-07-29 | Nils Bertil Agdur | Apparatus for measuring the properties of a material by resonance techniques |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2088749A (en) * | 1935-10-30 | 1937-08-03 | Bell Telephone Labor Inc | Reception of guided waves |
US2151118A (en) * | 1935-10-30 | 1939-03-21 | Bell Telephone Labor Inc | Termination for dielectric guides |
US2197122A (en) * | 1937-06-18 | 1940-04-16 | Bell Telephone Labor Inc | Guided wave transmission |
US2241119A (en) * | 1936-09-15 | 1941-05-06 | Pintsch Julius Kg | Ultra-short-wave apparatus |
US2259690A (en) * | 1939-04-20 | 1941-10-21 | Univ Leland Stanford Junior | High frequency radio apparatus |
US2261130A (en) * | 1938-06-21 | 1941-11-04 | Univ Leland Stanford Junior | High frequency radio apparatus |
US2425345A (en) * | 1942-12-23 | 1947-08-12 | Bell Telephone Labor Inc | Microwave transmission system |
US2426177A (en) * | 1944-06-10 | 1947-08-26 | Bell Telephone Labor Inc | Electrical resonator |
US2439388A (en) * | 1941-12-12 | 1948-04-13 | Sperry Corp | Resonator wave meter |
US2471419A (en) * | 1944-07-07 | 1949-05-31 | Bell Telephone Labor Inc | Tunable resonant cavity with adjustable walls |
-
0
- BE BE471382D patent/BE471382A/xx unknown
-
1946
- 1946-08-01 US US687549A patent/US2527619A/en not_active Expired - Lifetime
-
1947
- 1947-03-12 FR FR943059D patent/FR943059A/fr not_active Expired
- 1947-07-04 GB GB17688/47A patent/GB639008A/en not_active Expired
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2088749A (en) * | 1935-10-30 | 1937-08-03 | Bell Telephone Labor Inc | Reception of guided waves |
US2151118A (en) * | 1935-10-30 | 1939-03-21 | Bell Telephone Labor Inc | Termination for dielectric guides |
US2241119A (en) * | 1936-09-15 | 1941-05-06 | Pintsch Julius Kg | Ultra-short-wave apparatus |
US2197122A (en) * | 1937-06-18 | 1940-04-16 | Bell Telephone Labor Inc | Guided wave transmission |
US2261130A (en) * | 1938-06-21 | 1941-11-04 | Univ Leland Stanford Junior | High frequency radio apparatus |
US2259690A (en) * | 1939-04-20 | 1941-10-21 | Univ Leland Stanford Junior | High frequency radio apparatus |
US2439388A (en) * | 1941-12-12 | 1948-04-13 | Sperry Corp | Resonator wave meter |
US2425345A (en) * | 1942-12-23 | 1947-08-12 | Bell Telephone Labor Inc | Microwave transmission system |
US2426177A (en) * | 1944-06-10 | 1947-08-26 | Bell Telephone Labor Inc | Electrical resonator |
US2471419A (en) * | 1944-07-07 | 1949-05-31 | Bell Telephone Labor Inc | Tunable resonant cavity with adjustable walls |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2587055A (en) * | 1946-12-06 | 1952-02-26 | Bell Telephone Labor Inc | Electrical cavity resonator for microwaves |
US2593155A (en) * | 1947-03-07 | 1952-04-15 | Bell Telephone Labor Inc | Cavity resonator |
US2684469A (en) * | 1949-06-23 | 1954-07-20 | Sperry Corp | Mode selective attenuator |
US2760171A (en) * | 1951-04-20 | 1956-08-21 | Bell Telephone Labor Inc | Wave-guide mode filter |
US2747098A (en) * | 1952-02-04 | 1956-05-22 | Hewlett Packard Co | High frequency oscillator and resonator |
US2903657A (en) * | 1953-12-10 | 1959-09-08 | Siemens Ag | Wave conductor, particularly for travelling wave tubes |
US2916659A (en) * | 1956-02-24 | 1959-12-08 | Sperry Rand Corp | Electron beam forming apparatus |
US3458808A (en) * | 1964-05-29 | 1969-07-29 | Nils Bertil Agdur | Apparatus for measuring the properties of a material by resonance techniques |
Also Published As
Publication number | Publication date |
---|---|
GB639008A (en) | 1950-06-21 |
FR943059A (fr) | 1949-02-25 |
BE471382A (sh) |
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