EP0835533B1 - Hohlleiterfilter - Google Patents
Hohlleiterfilter Download PDFInfo
- Publication number
- EP0835533B1 EP0835533B1 EP96922868A EP96922868A EP0835533B1 EP 0835533 B1 EP0835533 B1 EP 0835533B1 EP 96922868 A EP96922868 A EP 96922868A EP 96922868 A EP96922868 A EP 96922868A EP 0835533 B1 EP0835533 B1 EP 0835533B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- waveguide
- ind
- guide structure
- waveguide filter
- frequency
- 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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Images
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 waveguide filter according to the preamble of claim 1.
- the design of waveguide screens is based on the known theorys of waveguide aperture technology (Waveguide Handbook, N. Marcuwitz, Mc Graw-Hill Book Company INC., Edition 1986).
- the waveguide apertures are as planar Structures with e.g. circular, slit or H-shaped Aperture openings are formed and in a cross-sectional plane an elongated waveguide perpendicular to the waveguide axis between a dining and a continuing Section of the waveguide used.
- Bandpass filters are used, the apertures at Natural resonance operated, which is known for slit-shaped Apertures in an electrically effective Slot length of half a wavelength of the useful frequency is set. With the slot width is the transmittance T determined by slit-shaped apertures.
- the high-conductor screens designed as bandpass filters have only one of the resonance curve outside its pass band corresponding damping curve.
- these bandpass filters generally no targeted Blocking of certain interfering frequency multiples of the Usable frequency possible.
- the known bandpass filters be supported with additional filter measures. In many cases, such as with small devices or with Sensors disturb the required volume of the known Bandpass filter.
- the manufacturing costs for FIN ladders with Resonance structures are relatively high.
- a waveguide filter is known from EP 0 029 276 A1, which consists of four planar conductor structures interacting in the waveguide field, which in the wall of a waveguide fed by a transmitter is integrated.
- the Conductor structures are in a cross-sectional plane on the circumference of the waveguide integrated into the wall at 90 ° to each other and each feed in a further waveguide section.
- a central aperture that is self-resonant for a transmission frequency is designed, two identically designed apertures for the suppression of Interference frequencies are formed. These apertures are on one long side of the central aperture arranged so that they are in relation to their longitudinal extent do not lie centrally on the axis of symmetry of the conductor structure, which are parallel to the Field strength vectors run.
- the object of the invention is to provide a bandpass filter for waveguides that additionally serves as a blocking filter for the targeted suppression of interference frequencies.
- the invention has the advantage that the transmission of a Usable frequency and a targeted suppression of interference frequencies with a single component with little effort is possible.
- manufacturing tolerances can be achieved with little effort comply and it only requires a small installation depth. Due to its symmetrical structure, the interference mode excitation minimal.
- FIG. 1 shows the conductor structure 2 of a waveguide filter, on the cross-sectional area of a rectangular Waveguide 1 is placed.
- the conductor structure 2 is in a metal layer on a planar, one-sided metallized, dielectric substrate formed.
- the apertures 3, 4 are short-circuited on both sides Slit ladder-shaped and parallel to each other and perpendicular to the vectors 5 of the adjacent one Waveguide E field arranged.
- the electrically effective The length of the centrally arranged slot conductor is one half the wavelength of the transmission frequency f (ind O) and the electrically effective length of the assigned slot conductor is half a wavelength each to be blocked Interference frequency f (ind S1) of the waveguide filter.
- the slot conductors dimensioned in this way are for the assigned frequencies in natural resonance and radiate with maximum performance in the adjoining secondary Section of the waveguide 1.
- the effect according to the invention can optionally also be achieved be if the centrally located slot conductor only a slot conductor in the manner described above assigned.
- the assignment of two slot conductors but the advantage that due to the symmetrical structure of the waveguide filter, the interference mode excitation is minimal.
- An arrangement of the two assigned also contributes to this Slot conductor near the border 6 of the waveguide interior at.
- the assignment of the transmission and to blocking interference frequency to apertures 3 and 4 can also be inverted so that the centrally located Aperture 3 on the interference frequency f (ind S1) and the assigned aperture 4 to the transmission frequency f (ind O) are designed.
- FIG. 2a to FIG. 2c show the transmission curves of the Waveguide filter according to FIG. 1.
- FIG. 2a is the transmission curve of the centrally arranged slot conductor shown
- FIG. 2b shows the transmission curve of the interacting assigned slot conductor
- FIG. 2c the Transmission curve of all superimposed slot conductor fields of the waveguide filter.
- the distance between the conductor structures 2 is one quarter of the wavelength of the transmission frequency f (ind O).
- the natural resonances of the assigned slot conductors a conductor structure 2 are at a first interference frequency f (ind S1) and that of the second conductor structure to one second interference frequency f (ind S2).
- the natural resonances the centrally arranged slot conductors are in two conductor structures on the transmission frequency f (ind C).
- FIG. 4a shows the transmission curve of one of the central arranged slot conductor.
- Figures 4b and 4c show assigned the transmission curves of the two interacting Slot conductor of a conductor structure for the respective Interference 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 area around the frequency f (ind O).
- the waveguide filter according to the invention can also be used for Form waveguides with other cross-sectional shapes, wherein make sure that the slotted conductor is perpendicular aligned the vectors 5 of the adjacent waveguide E field are.
- the conductor structure 2 can be a metal foil, the Thickness is not greater than one eighth of the wavelength the highest interference frequency to be blocked. she can but also in a metal layer of a metalized on one side, dielectric substrate may be formed, wherein with increasing size of the dielectric constant of the Substrate the filter properties become worse.
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Abstract
Description
Claims (9)
- Hohlleiterfilter, das als planare Leiterstruktur in einer Querschnittsebene eines länglichen Hohlleiters lotrecht zur Hohlleiterachse zwischen einem speisenden und einem weiterführenden Abschnitt des Hohlleiters eingesetzt ist, eine zentral angeordnete Blendenöffnung aufweist, die auf Eigenresonanz für eine gewählte Transmissionsfrequenz f(ind O) ausgelegt ist und zusätzlich zu der zentral angeordneten Blendenöffnung (3) zwei gleich ausgebildete, parallel beabstandete Blendenöffnungen (4) aufweist, dadurch gekennzeicnet, daß die gleich ausgebildeten Blendenöffnungen (4) auf Eigenresonanz für eine von dem Hohlleiterfilter zu sperrende Störfrequenz f(ind S1) ausgelegt sind und daß die Blendenöffnungen (3, 4) so in der Leiterstruktur (2) angeordnet sind, daß sie bezüglich ihrer Längsausdehnung jeweils mittig auf der Symmetrieachse der Leiterstruktur (2) liegen, die parallel zu den Feldstärke vektoren (5) verläuft.
- Hohlleiterfilter, das als planare Leiterstruktur in einer Querschnittsebene eines länglichen Hohlleiters lotrecht zur Hohlleiterachse zwischen einem speisenden und einem weiterführenden Abschnitt des Hohlleiters eingesetzt ist und mindestens eine Blendenöffnung aufweist, die auf Eigenresonanz für eine gewählte Transmissionsfrequenz f(ind O) ausgelegt ist, dadurch gekennzeichnet, daß die Leiterstruktur (2) eine zentral angeordnete Blendenöffnung (3) aufweist, die auf Eigenresonanz für eine mit dem Hohlleiterfilter zu sperrende Störfrequenz f(ind S1) ausgelegt ist und daß die Leiterstruktur (2) zusätzlich zu der zentral angeordneten Blendenöffnung (3) zwei gleich ausgebildete Blendenöffnungen (4)aufweist, die auf Eigenresonanz für eine gewählte Transmissionsfrequenz f(ind O) ausgelegt und symmetrisch zu der zentralen Blendenöffnung (3) angeordnet sind.
- Hohlleiterfilter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die zentral angeordnete Blendenöffnung (3) und die zusätzlichen Blendenöffnungen (4) als Schlitzleiter ausgebildet sind, daß die Schlitzleiter lotrecht zu den Vektoren (5) des angrenzenden Hohlleiter-E-Feldes ausgerichtet sind und daß die elektrisch wirksame Längen der Schlitzleiter je nach zugeordneter Eigenresonanzfrequenz eine halbe Wellenlänge der Transmissionsferequenz f(ind O) oder der Störfrequenz f(ind S1) beträgt.
- Hohlleiterfilter nach Anspruch 3, dadurch gekennzeichnet, daß die Schlitzleiterbreiten auf die gewünschte Transmissions- und Sperrwirkung abgestimmt sind.
- Hohlleiterfilter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß eine zweite Leiterstruktur (2) in eine Querschnittsebene des Hohlleiters mit einem Abstand zu der ersten Leiterstruktur (2) eingesetzt ist, der etwa einer viertel Wellenlänge der Transmissionsfrequenz f(ind O) entspricht und daß die zweite Leiterstruktur (2) eine zentrale Blendenöffnung (3) mit einer Eigenresonanz bei der Transmissionsfrequenz f(ind 0) und zwei zusätzliche Blendenöffnungen (4) jeweils mit einer Eigenresonanz bei einer zu sperrenden zweiten Störfrequenz f(ind S2) aufweist, die von der ersten Störfrequenz f(ind S1) abweicht.
- Hohlleiterfilter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Leiterstruktur (2) aus einer Metallfolie besteht, in die die Blendenöffnungen (3,4) eingearbeitet sind.
- Hohlleiterfilter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Leiterstruktur (2) aus einem einseitig metallisierten, dielektrischen Substrat besteht und daß die Blendenöffnungen (3,4) in die Metallschicht des Substrats eingearbeitet sind.
- Hohlleiterfilter nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Querschnitt des Hohlleiters (1) eine Rechteckform aufweist.
- Hohlleiterfilter nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Querschitt des Hohlleiters (1) eine Kreisform aufweist.
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 EP0835533A1 (de) | 1998-04-15 |
EP0835533B1 true 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 |
US6724280B2 (en) | 2001-03-27 | 2004-04-20 | 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 EP EP96922868A patent/EP0835533B1/de not_active Expired - Lifetime
- 1996-06-20 KR KR1019970709894A patent/KR100296513B1/ko not_active IP Right Cessation
- 1996-06-20 US US08/981,789 patent/US6340922B1/en not_active Expired - Fee Related
- 1996-06-20 IL IL12283096A patent/IL122830A0/xx unknown
- 1996-06-20 DE DE59605191T patent/DE59605191D1/de not_active Expired - Fee Related
- 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 JP JP50475997A patent/JP3242666B2/ja not_active Expired - Fee Related
- 1996-06-20 WO PCT/EP1996/002686 patent/WO1997002619A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
JP3242666B2 (ja) | 2001-12-25 |
ES2147387T3 (es) | 2000-09-01 |
US6340922B1 (en) | 2002-01-22 |
DE59605191D1 (de) | 2000-06-15 |
JPH10513025A (ja) | 1998-12-08 |
EP0835533A1 (de) | 1998-04-15 |
WO1997002619A1 (de) | 1997-01-23 |
KR19990028573A (ko) | 1999-04-15 |
DE19523869A1 (de) | 1997-01-02 |
CA2225928A1 (en) | 1997-01-23 |
KR100296513B1 (ko) | 2001-08-07 |
IL122830A0 (en) | 1999-11-30 |
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