EP1004149A1 - Waveguide filter - Google Patents
Waveguide filterInfo
- Publication number
- EP1004149A1 EP1004149A1 EP98947357A EP98947357A EP1004149A1 EP 1004149 A1 EP1004149 A1 EP 1004149A1 EP 98947357 A EP98947357 A EP 98947357A EP 98947357 A EP98947357 A EP 98947357A EP 1004149 A1 EP1004149 A1 EP 1004149A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- waveguide
- filter according
- waveguide filter
- area
- band
- 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
- H01P1/211—Waffle-iron filters; Corrugated structures
Definitions
- the invention is based on a waveguide filter with an input-side and / or an output-side
- Step transformer area and an area of alternating waveguide sections Step transformer area and an area of alternating waveguide sections.
- Such a waveguide filter is known from Microwave Filters Impedance-atching 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 ⁇ "/ 4, where ⁇ " denotes the waveguide wavelength in the pass band.
- a waveguide filter is known from ANT sympatheticenentechnischeberichte, Issue 5, November 1988, pages 114 to 120, with step transformers on the input and output sides and an intermediate region of coupled resonators in the form of a “corrugated waveguide filter” (Matthaei, Young, Jones, p. 358, 2nd paragraph) with low-pass behavior.
- the waveguide filter with the measures of claim 1 allows the construction of waveguide filters with high slope and short overall length.
- Waveguide filters with a high slope are principally to be realized with conventional "corrugated waveguide” filter structures.
- this would require a very large number of elements, ie short rectangular waveguide sections connected in chain with alternating small and large heights and thus a large overall length and mass.
- the high The number of elements would also lead to a very high attenuation in the pass band, which is particularly unacceptable when used in satellites.
- long cavity resonators are used either from the waveguide branching off from the waveguide via a coupled ⁇ g '/ 2 (with ⁇ g' equal to the waveguide wavelength in the stop band range) or fully coupled ⁇ g '/ 4 long stub lines which are short-circuited at the end (Matthaei, Young, Jones, pages 725 to 768).
- the distance between the resonators or stub lines is odd multiples of ⁇ g '/ 4.
- three filter circuits would add at least ⁇ g '/ 2 to the total length of a conventional low-pass filter.
- step transformer In contrast, in the invention, geometrically closely spaced locking members are used, the ones above are also integrated into the step transformer (s). These two measures provide a blocking area with very high blocking attenuation directly above the pass band and at the same time reduce the number of stages required. This allows in particular
- the width and depth of the stop area can be adapted to the respective requirements in a flexible manner.
- 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 traveling wave tubes in communication satellites, since it provides high blocking attenuation with a short overall length both directly above the pass band and in a very large frequency spacing.
- the area of waveguide sections that alternate in height can be called a "corrugated waveguide"
- Web waveguide filter area ridged waveguide
- waffle iron filter area 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 transmission channels are routed to a common busbar (output multiplexer) with the aid of suitably connected narrow-band channel filters and from there to the antenna.
- the traveling field tubes used as transmission amplifiers produce, in addition to the useful signal, undesired secondary signals (noise or harmonics of the transmission signal) which may only reach the antenna in a greatly weakened form.
- the channel filters have poor wide selection, additional low-pass filters have to be inserted in the transmission branch. Particularly high demands are placed on the blocking attenuation of these filters in the receiving bands of the satellite, e.g. the bands II and III at 14 and 18 Ghz ( Figure 3).
- Band II in the current generation of satellites is very close above transmission band I, in which the low-pass filter has its pass band.
- the filter When transitioning into the restricted area, an extremely high slope is therefore required.
- the filter must also have a high blocking attenuation at the second and third harmonics (bands IV and V) at 24 and 35 Ghz. All of these requirements are to be met with the filter according to the invention.
- the filter according to the invention provides an optimal compromise between the electrical and mechanical (mass, volume) properties.
- FIG. 1 shows a waveguide filter according to the invention in longitudinal section
- FIG. 2 shows a waveguide filter according to the invention in a top view
- Figure 3 shows the attenuation and adaptation curve of a waveguide filter according to the invention over frequency.
- 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 and 3 and one
- 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 are used for
- Step transformer areas 1 and 3 each have a bandstop 4 or 5 integrated, which is preferably at a jump point
- 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 and 51, 52, 53, here in the form of short-circuited stub lines with a length of approximately ⁇ g '/ 4.
- Geometrically close to each other here means that the otherwise usual intermediate lengths of at least ⁇ g '/ 4 are eliminated, that is, the distance between the locking members is small compared to ⁇ g '/ 4.
- These stub lines appear in the top view according to FIG. 2 as webs running over the entire waveguide width.
- the waffle iron filter has the additional advantage that it is in the range of the second and third harmonics (bands IV and V in Figure 3) also attenuates signal components 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, b4 being significantly smaller than the further connection heights bl
- the length of the steps is approximately ⁇ g / 4, where ⁇ g denotes the waveguide wavelength in the pass band.
- FIG. 3 which shows the attenuation and adaptation curve a over frequency f together with the frequency bands I to V intended for transmission, shows the extremely high slope at the transition from the pass band to the stop band.
- the blocking elements on the input and output sides should each have symmetrical blocking behavior in pairs. With different waveguide heights, as shown in Figure 1, the lengths of the stub lines are, however, asymmetrical.
- a ridge waveguide filter structure (ridged waveguide) can also be provided.
- the measures of the invention are not limited to applications in rectangular waveguides.
- the invention can also be used for filters in coaxial line technology, for example in the case of ANT - sympatheticenentechnischeberichte, Issue 2, December 1984, pages 36 to 41, in particular Figure 10, known filter type can be used.
- the step transformer area on the input or output side can also be omitted, in particular if the height of the desired connecting waveguide corresponds to the input or output height of area 2.
- locking members can also be designed differently.
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
- Microwave Amplifiers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19736367A DE19736367A1 (en) | 1997-08-21 | 1997-08-21 | Waveguide filter for HF power amplifier |
DE19736367 | 1997-08-21 | ||
PCT/DE1998/002133 WO1999010947A1 (en) | 1997-08-21 | 1998-07-28 | Waveguide filter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1004149A1 true EP1004149A1 (en) | 2000-05-31 |
EP1004149B1 EP1004149B1 (en) | 2001-11-21 |
Family
ID=7839709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98947357A Expired - Lifetime EP1004149B1 (en) | 1997-08-21 | 1998-07-28 | Waveguide filter |
Country Status (5)
Country | Link |
---|---|
US (1) | US6285267B1 (en) |
EP (1) | EP1004149B1 (en) |
CA (1) | CA2300937C (en) |
DE (2) | DE19736367A1 (en) |
WO (1) | WO1999010947A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108808187A (en) * | 2018-06-05 | 2018-11-13 | 电子科技大学中山学院 | Unilateral short circuit stub filter |
Families Citing this family (16)
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 (en) * | 2002-11-11 | 2004-06-10 | Nec Micro Hakan Kk | Electron tube for communication |
FR2889358B1 (en) * | 2005-07-27 | 2009-06-05 | Agence Spatiale Europeenne | MICROWAVE BAND REMOVAL FILTER FOR OUTPUT MULTIPLEXER |
JP4671905B2 (en) * | 2006-05-16 | 2011-04-20 | 日本無線株式会社 | Combined waveguide filter |
ES2335633B1 (en) * | 2008-01-21 | 2011-01-17 | Tafco Metawireless, S.L. | PASS-LOW FILTER FOR ELECTROMAGNETIC SIGNS. |
US8598960B2 (en) * | 2009-01-29 | 2013-12-03 | The Boeing Company | Waveguide polarizers |
CN102709680B (en) * | 2012-06-19 | 2014-08-06 | 成都赛纳赛德科技有限公司 | Waveguide fed slot antenna |
DE102012020576B4 (en) * | 2012-10-22 | 2018-02-15 | Tesat-Spacecom Gmbh & Co.Kg | Microwave filter with adjustable bandwidth |
RU2517397C1 (en) * | 2013-01-09 | 2014-05-27 | Алексей Валентинович Палицин | Higher frequencies waveguide filter |
US9531048B2 (en) * | 2013-03-13 | 2016-12-27 | Space Systems/Loral, Llc | Mode filter |
CN103531876A (en) * | 2013-10-25 | 2014-01-22 | 东南大学 | Efficient transmission line of surface plasmon |
DE102015122895A1 (en) | 2015-12-29 | 2017-06-29 | Mician Global Engineering GbR (vertretungsberechtigter Gesellschafter Dr. Ralf Beyer, 28203 Bremen) | Waveguide filter, multiplexer or demultiplexer with a waveguide filter, method for adjusting a waveguide filter and method for splitting or combining frequency ranges |
CN108493545B (en) * | 2018-05-22 | 2020-10-23 | 电子科技大学中山学院 | Take waffle mode harmonic suppressor of rectangle post |
CN108550968B (en) * | 2018-05-22 | 2020-10-23 | 电子科技大学中山学院 | Waveguide low-pass harmonic suppressor with pits |
CN112713371B (en) * | 2020-12-10 | 2022-03-04 | 北京无线电测量研究所 | Waveguide filter and use method thereof |
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 (en) * | 1983-11-24 | 1990-11-28 | ANT Nachrichtentechnik GmbH | Microwave-balanced mixer |
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/en not_active Withdrawn
-
1998
- 1998-07-28 CA CA002300937A patent/CA2300937C/en not_active Expired - Fee Related
- 1998-07-28 EP EP98947357A patent/EP1004149B1/en not_active Expired - Lifetime
- 1998-07-28 WO PCT/DE1998/002133 patent/WO1999010947A1/en active IP Right Grant
- 1998-07-28 US US09/486,179 patent/US6285267B1/en not_active Expired - Fee Related
- 1998-07-28 DE DE59802752T patent/DE59802752D1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9910947A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108808187A (en) * | 2018-06-05 | 2018-11-13 | 电子科技大学中山学院 | Unilateral short circuit stub filter |
Also Published As
Publication number | Publication date |
---|---|
CA2300937C (en) | 2004-05-11 |
CA2300937A1 (en) | 1999-03-04 |
DE19736367A1 (en) | 1999-02-25 |
DE59802752D1 (en) | 2002-02-21 |
US6285267B1 (en) | 2001-09-04 |
WO1999010947A1 (en) | 1999-03-04 |
EP1004149B1 (en) | 2001-11-21 |
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