EP0835533A1 - Hohlleiterfilter - Google Patents
HohlleiterfilterInfo
- Publication number
- EP0835533A1 EP0835533A1 EP96922868A EP96922868A EP0835533A1 EP 0835533 A1 EP0835533 A1 EP 0835533A1 EP 96922868 A EP96922868 A EP 96922868A EP 96922868 A EP96922868 A EP 96922868A EP 0835533 A1 EP0835533 A1 EP 0835533A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- waveguide
- ind
- conductor structure
- designed
- waveguide filter
- 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.)
- Granted
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
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
- H01P5/022—Transitions between lines of the same kind and shape, but with different dimensions
- H01P5/024—Transitions between lines of the same kind and shape, but with different dimensions between hollow waveguides
-
- 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
- the invention relates to a hollow conductor filter according to the preamble of patent claim 1.
- waveguide circuits compliance with the legal provisions with regard to the frequency band specifications and in particular with regard to the suppression of the interference radiation generated by oscillators, for example a harmonic of the useful signal, represents a not inconsiderable part of the development costs of a device concept. So far, the use of cavity resonators has been used in waveguide circuits , which are coupled with waveguide diaphragms, and the use of resonance structures in the area of the fin is known in FIN line circuits. Waveguide apertures are designed according to the known theories of waveguide aperture technology (Waveguide Handbook, N. Marcuwitz, Mc Graw-Hill Book Company INC., Edition 1986).
- the waveguide diaphragms are designed as planar structures with, for example, circular, slot-shaped or H-shaped diaphragm openings and are inserted in a cross-sectional plane of an elongated waveguide perpendicular to the waveguide axis between a feeding and a further section of the waveguide.
- the apertures When used as a bandpass filter, the apertures are operated at their own resonance, which is known to be set for slot-shaped apertures with an electrically effective slot length of half a wavelength of the useful frequency.
- the transmittance T of slot-shaped diaphragm openings is determined with the slot width.
- the waveguide diaphragms designed as bandpass filters only have an attenuation curve corresponding to the resonance curve outside their passband.
- bandpass filters it is generally not possible to specifically block interfering frequency multiples of the useful frequency.
- the known bandpass filters have to be supported with additional filter measures.
- the required volume of the known bandpass filter interferes.
- the manufacturing costs for FIN conductors with resonance structures are relatively high.
- the object of the invention is to provide a bandpass filter for waveguides, which additionally serves as a blocking filter for the targeted suppression of interference frequencies. This object is achieved by the features of claims 1 and 2. Developments of the invention are specified in the subclaims.
- the invention has the advantage that the transmission of a useful frequency and a targeted suppression of interference frequencies is possible with a single component with little effort.
- manufacturing tolerances can be maintained with little effort and it only requires a small installation depth. Due to its symmetrical structure, the disturbance mode excitation is minimal.
- FIG. 1 shows the principle of the conductor structure of a waveguide filter according to the invention for rectangular waveguides
- FIG. 2a to 2c show transmission curves of individual diaphragm openings and of the entire waveguide filter
- FIG. 3 shows a two-circuit waveguide filter with two conductor structures and arranged one behind the other
- FIG. 4a to FIG. 4d show transmission curves of individual diaphragm openings and of the entire two-circuit hollow conductor filter.
- FIG. 1 shows the conductor structure 2 of a waveguide filter, which is placed on the cross-sectional area of a rectangular waveguide 1.
- the conductor structure 2 is formed in a metal layer on a planar, one-sided metallized dielectric substrate.
- a centrally arranged diaphragm opening 3 and two further diaphragm openings 4 are integrated into the conductor structure 2 and are symmetrically assigned to the centrally arranged diaphragm opening 3.
- the diaphragm openings 3, 4 are designed as slot conductors short-circuited on both sides and arranged parallel to one another and perpendicular to the vectors 5 of the adjacent waveguide E field.
- the electrically effective length of the centrally arranged slot conductor is half a wavelength of the transmission frequency f (ind 0) and the electrically effective length of the assigned slot conductor is half a wavelength of an interference frequency f (ind S1) of the waveguide filter to be blocked.
- the slot conductors dimensioned in this way are self-resonant for the assigned frequencies and radiate with maximum power in the adjoining further section of the waveguide 1.
- the transmission phases of the centrally arranged slot conductor and those of the assigned slot conductors have in the frequency range f (ind 0) - f (ind Sl) opposite signs and different phase steepness, so that the amount of the sum vector of the overlapping slot conductor fields is minimized in the further section of the waveguide 1.
- the effect according to the invention can optionally also be achieved if only one slot conductor is assigned to the centrally arranged slot conductor in the manner described above.
- the assignment of two slot conductors has the advantage that the interference mode excitation is minimal due to the symmetrical structure of the waveguide filter.
- An arrangement of the two assigned slot conductors in the vicinity of the border 6 of the hollow conductor interior also contributes to this.
- the assignment of the transmission frequency and the interference frequency to be blocked to the diaphragm openings 3 and 4 can also be inverted, so that the centrally arranged diaphragm opening 3 to the interference frequency f (ind S1) and the assigned diaphragm openings 4 to the transmission frequency f (ind 0 ) are designed.
- FIG. 2a to FIG. 2c show the transmission curves of the waveguide filter according to FIG. 1.
- FIG. 2a shows the transmission curve of the centrally arranged slot conductor
- FIG. 2b shows the transmission curve of the cooperating assigned slot conductors
- FIG. 2c the transmission curve of all superimposed slot conductor fields of the waveguide filter.
- a dual-circuit waveguide filter is to be constructed with regard to the blocking effect, this can be done according to the method shown in FIG. 3 realize embodiment shown in that two spaced conductor structures 2, which basically correspond to the embodiment of FIG. 1 are designed to be used in the waveguide.
- the distance between the conductor structures 2 is a quarter of the wavelength of the transmission frequency f (ind 0).
- the natural resonances of the assigned slot conductors of the one conductor structure 2 are designed for a first interference frequency f (ind S1) and those of the second conductor structure for a second interference frequency f (ind S2).
- the natural resonances of the centrally arranged slot conductors are designed for the transmission frequency f (ind 0) in both conductor structures.
- FIG. 4a shows the transmission curve of one of the centrally arranged slot conductors.
- FIGS. 4b and 4c show the transmission curves of the two cooperating assigned slot conductors of a conductor structure for the respective interfering frequency.
- FIG. 4d shows the transmission curve of the entire two-circuit waveguide filter. In addition to the blocking effects at the interference frequencies f (ind S1) and f (ind S2), the curve shows a flattening in the transmission range around the frequency f (ind 0).
- the waveguide filter according to the invention can also be designed for waveguides with other cross-sectional shapes, it being necessary to ensure that the slotted conductors are aligned perpendicular to the vectors 5 of the adjacent waveguide E field.
- the conductor structure 2 can be a metal foil, the thickness of which must not be greater than one eighth of the wavelength of the highest interference frequency to be blocked. However, it can also be formed in a metal layer of a dielectric substrate metallized on one side, the filter properties deteriorating with increasing size of the dielectric constant of the substrate.
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19523869A DE19523869A1 (de) | 1995-06-30 | 1995-06-30 | Hohlleiterfilter |
| DE19523869 | 1995-06-30 | ||
| PCT/EP1996/002686 WO1997002619A1 (de) | 1995-06-30 | 1996-06-20 | Hohlleiterfilter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0835533A1 true EP0835533A1 (de) | 1998-04-15 |
| EP0835533B1 EP0835533B1 (de) | 2000-05-10 |
Family
ID=7765685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96922868A Expired - Lifetime EP0835533B1 (de) | 1995-06-30 | 1996-06-20 | Hohlleiterfilter |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6340922B1 (de) |
| EP (1) | EP0835533B1 (de) |
| JP (1) | JP3242666B2 (de) |
| KR (1) | KR100296513B1 (de) |
| CA (1) | CA2225928A1 (de) |
| DE (2) | DE19523869A1 (de) |
| ES (1) | ES2147387T3 (de) |
| IL (1) | IL122830A0 (de) |
| WO (1) | WO1997002619A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6459346B1 (en) * | 2000-08-29 | 2002-10-01 | Com Dev Limited | Side-coupled microwave filter with circumferentially-spaced irises |
| WO2002078118A1 (en) | 2001-03-27 | 2002-10-03 | Paratek Microwave, Inc. | Tunable rf devices with metallized non-metallic bodies |
| US7009469B2 (en) * | 2002-06-28 | 2006-03-07 | Harris Corporation | Compact waveguide filter and method |
| US7298264B1 (en) | 2004-01-20 | 2007-11-20 | Charles A. Eldering | RFID tag filtering and monitoring |
| US7420458B1 (en) | 2004-01-20 | 2008-09-02 | Charles A. Eldering | Secondary card reader |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1104184A (en) | 1966-05-16 | 1968-02-21 | Standard Telephones Cables Ltd | Improvements in or relating to waveguide filters |
| CA1079369A (en) * | 1977-03-14 | 1980-06-10 | Rca Limited | Dual mode filter |
| US4211987A (en) * | 1977-11-30 | 1980-07-08 | Harris Corporation | Cavity excitation utilizing microstrip, strip, or slot line |
| NL181064C (nl) | 1979-11-15 | 1987-06-01 | Nederlanden Staat | Microgolffilter. |
| IT1163520B (it) * | 1983-06-15 | 1987-04-08 | Telettra Lab Telefon | Filtri dual-mode |
| FR2604305B1 (fr) * | 1986-09-18 | 1988-12-02 | Alcatel Thomson Faisceaux | Filtre composite a large bande de type plan e |
-
1995
- 1995-06-30 DE DE19523869A patent/DE19523869A1/de not_active Withdrawn
-
1996
- 1996-06-20 DE DE59605191T patent/DE59605191D1/de not_active Expired - Fee Related
- 1996-06-20 EP EP96922868A patent/EP0835533B1/de not_active Expired - Lifetime
- 1996-06-20 ES ES96922868T patent/ES2147387T3/es not_active Expired - Lifetime
- 1996-06-20 CA CA002225928A patent/CA2225928A1/en not_active Abandoned
- 1996-06-20 WO PCT/EP1996/002686 patent/WO1997002619A1/de not_active Ceased
- 1996-06-20 IL IL12283096A patent/IL122830A0/xx unknown
- 1996-06-20 JP JP50475997A patent/JP3242666B2/ja not_active Expired - Fee Related
- 1996-06-20 KR KR1019970709894A patent/KR100296513B1/ko not_active Expired - Fee Related
- 1996-06-20 US US08/981,789 patent/US6340922B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9702619A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59605191D1 (de) | 2000-06-15 |
| US6340922B1 (en) | 2002-01-22 |
| CA2225928A1 (en) | 1997-01-23 |
| EP0835533B1 (de) | 2000-05-10 |
| ES2147387T3 (es) | 2000-09-01 |
| JPH10513025A (ja) | 1998-12-08 |
| DE19523869A1 (de) | 1997-01-02 |
| JP3242666B2 (ja) | 2001-12-25 |
| KR100296513B1 (ko) | 2001-08-07 |
| KR19990028573A (ko) | 1999-04-15 |
| WO1997002619A1 (de) | 1997-01-23 |
| IL122830A0 (en) | 1999-11-30 |
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