EP1004149B1 - Hohlleiterfilter - Google Patents
Hohlleiterfilter Download PDFInfo
- Publication number
- EP1004149B1 EP1004149B1 EP98947357A EP98947357A EP1004149B1 EP 1004149 B1 EP1004149 B1 EP 1004149B1 EP 98947357 A EP98947357 A EP 98947357A EP 98947357 A EP98947357 A EP 98947357A EP 1004149 B1 EP1004149 B1 EP 1004149B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- waveguide
- filter according
- region
- filter
- 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.)
- Expired - Lifetime
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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
- H01P1/211—Waffle-iron filters; Corrugated structures
Definitions
- the invention is based on a waveguide filter with a input side or output side Step transformer area as well as an area in the Height of alternating waveguide sections.
- Such a waveguide filter is known from Microwave-Filters Impedance-Matching Networks and Coupling Structures, Matthaei, Young, Jones, Mc Graw Hill Book Company 1964, pages 398 to 408, in particular Figure 7.05-8 on page 405.
- the area increases in height alternating waveguide sections there consists of a waffle iron filter structure.
- step transformers are arranged with step areas, the length of each of which is ⁇ g / 4, where ⁇ g denotes the waveguide wavelength in the pass band.
- a waveguide filter is known with step transformers on the input and output side and an intermediate area coupled Resonators in the form of a "corrugated waveguide filter" (Matthaei, Young, Jones, p. 358, 2nd paragraph) with Low pass behavior.
- US-A-3597710 shows a waveguide filter which in Step transformer area on the input and output side resonators separated by capacitive shutters has different heights that are dense successive. Between these Step transformer areas are in height alternating waveguide sections are provided.
- the waveguide filter with the measures of claim 1 allows the construction of waveguide filters with high Slope slopes and short overall length.
- waveguide filters with a high slope are used with conventional "corrugated waveguide" filter structures realize.
- the high number of elements would also increase a very high attenuation in the pass band, the especially unacceptable when used in satellites is.
- Edge steepness consists in the use of additional relatively narrow-band notch filters.
- waveguide band barriers either cavity resonators branching off from the waveguide are used, or ⁇ g '/ 4 long ( ⁇ g ' waveguide wavelength in the blocked region) and short-circuited stub lines at the end (Matthaei, Young, Jones; pages 725 to 768).
- the distance between the resonators or stub lines is odd multiples of ⁇ g '/ 4. If, for example, three filter circuits were used, at least ⁇ g '/ 2 would be added to the total length of a conventional low-pass filter.
- the width and depth of the restricted area in a more flexible manner Be adjusted in ways.
- the waveguide filter according to the invention has a very short overall length.
- the entire structure can be manufactured using cost-effective milling technology and, with suitable dimensions, does not require any adjustment elements.
- the filter according to the invention is particularly suitable for the suppression of unwanted secondary signals from Wandering tubes in communications satellites as it is short Overall length both immediately above the pass band as well as in a very large frequency spacing Barrier damping delivers.
- Waveguide sections can be called "corrugated waveguide” Web waveguide filter area (ridged waveguide) or as Waffle iron filter area can be designed.
- the Design as a waffle iron filter area has the additional advantage that in the area of the second and third Harmonics are also attenuated signal components that spread in the form of higher waveguide modes.
- the signals of the individual are in communication satellites Broadcast channels with the help of suitably connected narrowband Channel filter routed to a common busbar (Output multiplexer) and from there to the antenna guided.
- Those used as transmit amplifiers However, traveling wave tubes produce in addition to the useful signal unwanted secondary signals (noise or harmonic of the Transmission signal), which is only in a greatly weakened form Antenna.
- the channel filter is a bad one Have wide selection, additional low-pass filters be inserted in the transmission branch. Particularly high There are requirements for the blocking attenuation of these filters in the reception bands of the satellite, e.g. tapes II and III at 14 or 18 Ghz ( Figure 3).
- Volume II is with current generation of satellites very close above Transmission band I, in which the low-pass filter its Passband has. At the transition to the restricted area an extremely high slope is therefore required. At the same time, the filter must also be used for the second one and third harmonics (bands IV and V) at 24 and 35 Ghz have a high blocking attenuation. All of these demands are to be observed with the filter according to the invention.
- the filter according to the invention provides an optimal one Compromise between electrical and mechanical (mass, Volume) properties.
- Figure 1 shows an example of a waveguide filter according to the invention in a longitudinal section. It consists of an input and an output-side step transformer area 1 or 3 and an intermediate area 2 consisting of a chain of short rectangular waveguide sections with alternating small and large heights, the small sections acting as parallel capacitors and the large ones as series inductors.
- the step transformer areas 1 and 3 serve to adapt the waveguide to be connected, the dimensions of which are designed for the useful band.
- a bandstop 4 or 5 is integrated according to the invention, which is preferably at a jump point of a step transformer - in the exemplary embodiment between the waveguide section of height b2 and the waveguide section b3, or accordingly between the waveguide section of height b5 and b6 - is arranged.
- Such a bandstop preferably consists of geometrically closely spaced blocking members 41, 42, 43 or 51, 52, 53, here in the form of stub lines short-circuited at the end with a length of approximately ⁇ g '/ 4.
- the waveguide low-pass filter shown in FIG. 1 can be, for example, an ordinary "corrugated filter” or preferably - as shown in Figure 2 - a waffle iron filter.
- the waffle iron filter has the additional advantage that it also dampens signal components in the region of the second and third harmonics (bands IV and V in FIG. 3) which propagate in the form of higher waveguide modes.
- Both filter types generally have a low input impedance, ie they are designed for the connection cross section ax b4, with b4 being significantly smaller than the further connection heights b1 and b6.
- b4 being significantly smaller than the further connection heights b1 and b6.
- the input and output locking elements each exhibit symmetrical locking behavior in pairs.
- the lengths of the stub lines are shown asymmetrical.
- Waffle iron filters can also be a Web waveguide filter structure (ridged waveguide) provided his.
- the measures of the invention are not on applications limited for rectangular waveguides. So the invention also with filters in coaxial line technology, for example, the one from ANT messages Reports, Issue 2, December 1984, pages 36 to 41, in particular Figure 10, known filter type can be used.
- Step transformer area are omitted, especially if the desired connecting waveguide in height with the input or Initial height of area 2 matches.
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- Microwave Amplifiers (AREA)
Description
Claims (12)
- Hohlleiterfilter mit einem eingangsseitigen oder ausgangsseitigen Stufentransformatorbereich (1, 3) sowie einem Bereich sich in der Höhe abwechselnder Hohlleiterabschnitte (2), dadurch gekennzeichnet, daß in den Stufentransformatorbereich (1, 3) mindestens eine Bandsperre (4, 5) in Form von mindestens zwei dicht aufeinanderfolgenden Sperrgliedern (41, 42, 43; 51, 52, 53) integriert ist, deren Abstand untereinander klein gegenüber einem Viertel der Hohlleiterwellenlänge λg im Durchlaßbereich ist.
- Hohlleiterfilter nach Anspruch 1, dadurch gekennzeichnet, daß die Bandsperre (4, 5) aus dicht aufeinanderfolgenden am Ende kurzgeschlossenen Stichleitungen besteht.
- Hohlleiterfilter nach Anspruch 2, dadurch gekennzeichnet, daß die Stichleitungen der Sperrglieder (41, 42, 43; 51, 52, 53) einer Bandsperre voneinander unterschiedliche Längen aufweisen.
- Hohlleiterfilter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Sperrglieder (41, 42, 43; 51, 52, 53) sowohl im eingangs- wie auch im ausgangsseitigen Stufentransformatorbereich (1, 3) vorgesehen sind.
- Hohlleiterfilter nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß die am Ende kurzgeschlossenen Stichleitungen etwa eine Länge von λg'/4 aufweisen, wobei λg' die Hohlleiterwellenlänge im Sperrbereich der Bandsperre bezeichnet.
- Hohlleiterfilter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Sperrglieder (41, 42, 43; 51, 52, 53) sowohl eingangs- als auch ausgangsseitig des Bereiches sich in der Höhe abwechselnder Hohlleiterabschnitte (2) angeordnet sind und einen Abstand von jeweils etwa λg/4 von diesem Bereich aufweisen.
- Hohlleiterfilter nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Bereich sich in der Höhe abwechselnder Hohlleiterabschnitte (2) als Steghohlleiterfilterbereich oder Waffeleisenfilterbereich ausgebildet ist.
- Hohlleiterfilter nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, daß die eingangs- und ausgangsseitigen Sperrglieder (41, 42, 43; 51, 52, 53) der Bandsperren jeweils paarweise symmetrisches Sperrverhalten aufweisen.
- Hohlleiterfilter nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Sperrglieder (41, 42, 43; 51, 52, 53) einer Bandsperre (4) an einer Sprungstelle des eingangsseitigen oder ausgangsseitigen Stufentransformatorbereichs (1, 3) angeordnet sind.
- Hohlleiterfilter nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Sperrglieder (41, 42, 43; 51, 52, 53) einer Bandsperre (4) an einer Sprungstelle des eingangsseitigen und des ausgangsseitigen Stufentransformatorbereichs (1, 3) angeordnet sind.
- Verwendung des Hohlleiterfilters nach einem der Ansprüche 1 bis 10 als Tiefpaßfilter in einem Sendezweig eines Hochfrequenzleistungsverstärkers.
- Verwendung des Hohlleiterfilters nach Anspruch 11 in einem Wanderfeldröhrenverstärker für einen Satelliten mit relativ dicht nebeneinanderliegenden Sende- und Empfangsbändern.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19736367A DE19736367A1 (de) | 1997-08-21 | 1997-08-21 | Hohlleiterfilter |
DE19736367 | 1997-08-21 | ||
PCT/DE1998/002133 WO1999010947A1 (de) | 1997-08-21 | 1998-07-28 | Hohlleiterfilter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1004149A1 EP1004149A1 (de) | 2000-05-31 |
EP1004149B1 true EP1004149B1 (de) | 2001-11-21 |
Family
ID=7839709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98947357A Expired - Lifetime EP1004149B1 (de) | 1997-08-21 | 1998-07-28 | Hohlleiterfilter |
Country Status (5)
Country | Link |
---|---|
US (1) | US6285267B1 (de) |
EP (1) | EP1004149B1 (de) |
CA (1) | CA2300937C (de) |
DE (2) | DE19736367A1 (de) |
WO (1) | WO1999010947A1 (de) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6169466B1 (en) * | 1999-05-10 | 2001-01-02 | Com Dev Limited | Corrugated waveguide filter having coupled resonator cavities |
US7009469B2 (en) * | 2002-06-28 | 2006-03-07 | Harris Corporation | Compact waveguide filter and method |
JP2004164904A (ja) * | 2002-11-11 | 2004-06-10 | Nec Micro Hakan Kk | 通信用電子管 |
FR2889358B1 (fr) * | 2005-07-27 | 2009-06-05 | Agence Spatiale Europeenne | Filtre a elimination de bande a micro-ondes pour multiplexeur de sortie |
JP4671905B2 (ja) * | 2006-05-16 | 2011-04-20 | 日本無線株式会社 | 組合わせ導波管フィルタ |
ES2335633B1 (es) | 2008-01-21 | 2011-01-17 | Tafco Metawireless, S.L. | Filtro paso-bajo para señales electromagneticas. |
US8598960B2 (en) | 2009-01-29 | 2013-12-03 | The Boeing Company | Waveguide polarizers |
CN102709680B (zh) * | 2012-06-19 | 2014-08-06 | 成都赛纳赛德科技有限公司 | 一种波导馈电缝隙天线 |
DE102012020576B4 (de) * | 2012-10-22 | 2018-02-15 | Tesat-Spacecom Gmbh & Co.Kg | Mikrowellenfilter mit einstellbarer Bandbreite |
RU2517397C1 (ru) * | 2013-01-09 | 2014-05-27 | Алексей Валентинович Палицин | Волноводный фильтр верхних частот |
US9531048B2 (en) * | 2013-03-13 | 2016-12-27 | Space Systems/Loral, Llc | Mode filter |
CN103531876A (zh) * | 2013-10-25 | 2014-01-22 | 东南大学 | 高效表面等离子基元传输线 |
DE102015122895A1 (de) | 2015-12-29 | 2017-06-29 | Mician Global Engineering GbR (vertretungsberechtigter Gesellschafter Dr. Ralf Beyer, 28203 Bremen) | Hohlleiterfilter, Multiplexer oder Demultiplexer mit einem Hohlleiterfilter, Verfahren zum Einstellen eines Hohlleiterfilters und Verfahren zum Aufteilen oder Kombinieren von Frequenzbereichen |
CN108550968B (zh) * | 2018-05-22 | 2020-10-23 | 电子科技大学中山学院 | 一种带凹坑的波导低通谐波抑制器 |
CN108493545B (zh) * | 2018-05-22 | 2020-10-23 | 电子科技大学中山学院 | 一种带矩形柱的华夫模谐波抑制器 |
CN108808187A (zh) * | 2018-06-05 | 2018-11-13 | 电子科技大学中山学院 | 一种单侧短路支节滤波器 |
CN112713371B (zh) * | 2020-12-10 | 2022-03-04 | 北京无线电测量研究所 | 一种波导滤波器及其使用方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3271706A (en) * | 1964-12-07 | 1966-09-06 | Gen Electric | Microwave filter |
US3597710A (en) * | 1969-11-28 | 1971-08-03 | Microwave Dev Lab Inc | Aperiodic tapered corrugated waveguide filter |
US3845422A (en) * | 1973-04-17 | 1974-10-29 | Microwave Dev Labor | Stop band filter |
EP0143225B1 (de) * | 1983-11-24 | 1990-11-28 | ANT Nachrichtentechnik GmbH | Mikrowellen-Gegentaktfrequenzumsetzer |
CA1259676A (en) * | 1986-12-04 | 1989-09-19 | Chuck K. Mok | 14/12 ghz duplexer |
US5142255A (en) * | 1990-05-07 | 1992-08-25 | The Texas A&M University System | Planar active endfire radiating elements and coplanar waveguide filters with wide electronic tuning bandwidth |
US6169466B1 (en) * | 1999-05-10 | 2001-01-02 | Com Dev Limited | Corrugated waveguide filter having coupled resonator cavities |
-
1997
- 1997-08-21 DE DE19736367A patent/DE19736367A1/de not_active Withdrawn
-
1998
- 1998-07-28 DE DE59802752T patent/DE59802752D1/de not_active Expired - Fee Related
- 1998-07-28 CA CA002300937A patent/CA2300937C/en not_active Expired - Fee Related
- 1998-07-28 US US09/486,179 patent/US6285267B1/en not_active Expired - Fee Related
- 1998-07-28 EP EP98947357A patent/EP1004149B1/de not_active Expired - Lifetime
- 1998-07-28 WO PCT/DE1998/002133 patent/WO1999010947A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
DE59802752D1 (de) | 2002-02-21 |
WO1999010947A1 (de) | 1999-03-04 |
DE19736367A1 (de) | 1999-02-25 |
EP1004149A1 (de) | 2000-05-31 |
CA2300937A1 (en) | 1999-03-04 |
CA2300937C (en) | 2004-05-11 |
US6285267B1 (en) | 2001-09-04 |
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