WO1998038690A1 - Anordnung zur entzerrung eines frequenzsignals, insbesondere für eine satellitenkommunikationsanlage - Google Patents
Anordnung zur entzerrung eines frequenzsignals, insbesondere für eine satellitenkommunikationsanlage Download PDFInfo
- Publication number
- WO1998038690A1 WO1998038690A1 PCT/DE1997/002580 DE9702580W WO9838690A1 WO 1998038690 A1 WO1998038690 A1 WO 1998038690A1 DE 9702580 W DE9702580 W DE 9702580W WO 9838690 A1 WO9838690 A1 WO 9838690A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- frequency
- filter
- equalizer
- circulator
- frequency signal
- Prior art date
Links
- 238000004891 communication Methods 0.000 title claims abstract description 8
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P9/00—Delay lines of the waveguide type
- H01P9/003—Delay equalizers
Definitions
- the invention relates to an arrangement for equalizing a frequency signal, in particular for a satellite communication system, with a channel filter and an equalizer connected downstream of the channel filter.
- the disadvantage here is that there are so-called transit time differences between the low, medium and high frequency signal components within a narrow-band frequency band. These delay differences lead to signal falsifications in the subsequent composition and amplification of the signals.
- CM Kudsia Synthesis of Optimum Reflection-Type Microwave Equalizers, RCA Review, September 1997, page 571 ff., For example, discloses the use of a microwave equalizer in satellite communication systems.
- Waveguide resonators or dielectric resonators with a downstream, short-circuited two-circuit filter are usually used here.
- These resonators have the disadvantage that they are of relatively large construction and there are therefore limits to the use of a large number of these resonators in satellite communication systems, in particular in the satellite itself.
- it is generally known to produce filters in a superconducting planar technology. Compared to known filters and equalizers, these save considerable space and weight.
- the equalizer consists of an at least partially superconducting reflection equalizer, which preferably has a planar circulator and a superconducting reflection filter, the components used in superconducting planar technology allow the signals to be equalized and the group delay to be reduced in the smallest possible installation space.
- the low-frequency and higher-frequency signal components of the signal to be transmitted in a specific frequency band are superimposed on the reflection filter in such a way that their transit time approximates the transit time of the medium-frequency signal components, so that the variation in the group delay is drastically reduced.
- Figure 1 is a schematic view of an arrangement for equalizing a frequency signal
- Figure 2 shows the group runtime of the individual components of the arrangement of Figure 1 and
- FIG. 3 shows a group runtime of the entire arrangement according to FIG. 1.
- an arrangement 10 for equalizing a frequency signal is shown schematically.
- the arrangement 10 has a channel filter 12, at the input connection 14 of which a frequency signal is present.
- An equalizer 18 is connected to an output terminal 16 of the channel filter 12.
- the equalizer 18 has a circulator 20 and a reflection filter 22.
- the circulator 20 is connected with a first connection 24 to the output connection 16 of the channel filter 12.
- a second connection 26 of the circulator 20 is connected to the reflection filter 22 and the equalized frequency signal is present at an output connection 28.
- the channel filter 12 is, for example, an 8-circuit filter.
- the reflection filter 22 is, for example, a microstrip or coplanar filter, while the circulator 20 is a Y microstrip line circulator.
- the reflection filter 22 has a coupling line 30 which is connected to the connection 26 of the circulator 20. Furthermore, at least one pair of planar resonators 32 coupled to one another is provided.
- the coupling line 30 is resistance-matched to the circulator 20, in particular its connection 26. This adjusts the opening width of the connection 26 to the opening width of the coupling line 30, so that an optimal connection transition is achieved with regard to reflection behavior. This avoids reflection losses.
- the arrangement 10 shown in FIG. 1 has the following function:
- a frequency signal present at the input connection 14 is band-limited by the channel filter 12, that is to say that only a narrow frequency band is filtered out.
- the input signal is, for example, in the gigahertz range (microwave), for example from 3.4 to 4.2 GHz.
- the channel filter 12 turns this input signal into the narrow frequency band filtered out.
- the filtering is carried out in accordance with the design of the channel filter 12.
- This narrow frequency band is to be fed to an amplifier following the output connection 28 of the arrangement 10.
- the individual frequencies of the narrowed frequency band filtered out have a different transit time due to their different frequency, so that their amplification and subsequent reassembly to the amplified output signal would lead to signal falsifications.
- the low and higher frequency signal components of the frequency signal present at the output connection 16 are slower than the medium frequency signal components. Overall there is a group run time difference of around 20 to 40 ns.
- FIG. 2 the group delay time of the frequency components of the frequency signal present at the input connection 14 is plotted against the frequency as an example.
- the upper solid line illustrates the group delay in channel filter 12. It is clear that between the low frequency range at 3.885 GHz and the higher frequency range at 3.920 GHz and the middle frequency range at approximately 3.900 to 3.905 GHz there is a delay time difference of approximately 15 ns (from approximately 28 up to approximately 42 ns).
- the individual signal components are fed into the circulator 20.
- the frequency signals are passed to the connection 26 via the circulator 20 and from there to the planar resonators 32 via the coupling line 30.
- the signals are from the Planar resonators 32 are reflected and again fed to the resonator of the circulator 20 via the coupling line 30 and the connection 26. From there, there is a reflection at the output connection 28 of the circulator 20.
- the equalizer 18 which consists of the circulator 20 and the reflection filter 22, is designed in such a way that the transit time of the low-frequency and higher-frequency frequency signals is less than the transit time of the medium-frequency signal components. Viewed over the frequency band, the transit time of the equalizer 18 has an increasing parabola in the areas in which the transit times in the channel filter 12 have a descending parabola. On the other hand, the transit time in the equalizer 18 has a falling parabola in the frequency range in which the transit time in the channel filter has an increasing parabola.
- the signal of the group delay over frequency is shown in FIG.
- Superimposing the transit times of the individual frequency components results in a parabolic curve over the frequency, which shows a group delay difference, i.e. the distance from the slowest transit time to the fastest transit time, of approximately 3 ns (from approximately 38 to approximately 41 ns).
- group delay time differences as a function of the frequency of the entire arrangement 10 are drastically reduced.
- group delays of less than 2 ns can be achieved.
- These runtime differences within a channel do not lead to any significant signal falsification in the case of a subsequent amplification and composition of the output information.
- a space and weight saving is achieved at the same time by constructing the arrangement 10 in superconducting planar technology.
- Such arrangements 10 are suitable for use in satellites in a satellite communication system.
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- Control Of Motors That Do Not Use Commutators (AREA)
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- Waveguide Connection Structure (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/380,145 US6307444B1 (en) | 1997-02-26 | 1997-06-11 | Frequency signal equalizing device, specially for a satellite communications facility |
JP53713298A JP2001513279A (ja) | 1997-02-26 | 1997-11-06 | 周波数信号の等化装置、例えば衛星通信装置用の周波数信号の等化装置 |
EP97949874A EP0962031B1 (de) | 1997-02-26 | 1997-11-06 | Anordnung zur entzerrung eines frequenzsignals, insbesondere für eine satellitenkommunikationsanlage |
DE59706581T DE59706581D1 (de) | 1997-02-26 | 1997-11-06 | Anordnung zur entzerrung eines frequenzsignals, insbesondere für eine satellitenkommunikationsanlage |
CA002277996A CA2277996A1 (en) | 1997-02-26 | 1997-11-06 | Arrangement for the equalization of a frequency signal, for a satellite communication system in particular |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19707675A DE19707675A1 (de) | 1997-02-26 | 1997-02-26 | Anordnung zur Entzerrung eines Frequenzsignals, insbesondere für eine Satellitenkommunikationsanlage |
DE19707675.0 | 1997-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998038690A1 true WO1998038690A1 (de) | 1998-09-03 |
Family
ID=7821533
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1997/002580 WO1998038690A1 (de) | 1997-02-26 | 1997-11-06 | Anordnung zur entzerrung eines frequenzsignals, insbesondere für eine satellitenkommunikationsanlage |
Country Status (6)
Country | Link |
---|---|
US (1) | US6307444B1 (de) |
EP (1) | EP0962031B1 (de) |
JP (1) | JP2001513279A (de) |
CA (1) | CA2277996A1 (de) |
DE (2) | DE19707675A1 (de) |
WO (1) | WO1998038690A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001257630A (ja) * | 2000-02-28 | 2001-09-21 | Illinois Super Conductor Corp | 無線通信システム |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10020930B4 (de) | 2000-04-28 | 2007-10-04 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Vorrichtung und Verfahren zur Vorbehandlung eines unter Verwendung eines nichtlinearen Verstärkers mit vorgeschaltetem Bandpaßfilter zu übertragenden Signals |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4491808A (en) * | 1981-11-05 | 1985-01-01 | Mitsubishi Denki Kabushiki Kaisha | Equalizer circuit for use in communication unit |
US5172084A (en) * | 1991-12-18 | 1992-12-15 | Space Systems/Loral, Inc. | Miniature planar filters based on dual mode resonators of circular symmetry |
USH1408H (en) * | 1993-04-19 | 1995-01-03 | The United States Of America As Represented By The Secretary Of The Army | Microwave circulator with a planar, biasing, permanent magnet |
US5616538A (en) * | 1994-06-06 | 1997-04-01 | Superconductor Technologies, Inc. | High temperature superconductor staggered resonator array bandpass filter |
-
1997
- 1997-02-26 DE DE19707675A patent/DE19707675A1/de not_active Withdrawn
- 1997-06-11 US US09/380,145 patent/US6307444B1/en not_active Expired - Fee Related
- 1997-11-06 JP JP53713298A patent/JP2001513279A/ja active Pending
- 1997-11-06 DE DE59706581T patent/DE59706581D1/de not_active Expired - Fee Related
- 1997-11-06 EP EP97949874A patent/EP0962031B1/de not_active Expired - Lifetime
- 1997-11-06 WO PCT/DE1997/002580 patent/WO1998038690A1/de active IP Right Grant
- 1997-11-06 CA CA002277996A patent/CA2277996A1/en not_active Abandoned
Non-Patent Citations (4)
Title |
---|
HUANG F: "LOW LOSS QUASITRANSVERSAL MICROWAVE FILTERS WITH SPECIFIED AMPLITUDE AND PHASE CHARACTERISTICS", IEE PROCEEDINGS: MICROWAVES, ANTENNAS AND PROPAGATION, vol. 140, no. 6, PART H, 1 December 1993 (1993-12-01), pages 433 - 440, XP000420572 * |
MANSOUR R R ET AL: "C-BAND EXTERNALLY-EQUALIZED SUPERCONDUCTIVE INPUT CHANNEL FILTERS", 1994 IEEE INTERNATIONAL MICROWAVE SYMPOSIUM-DIGEST, vol. 1, 23 May 1994 (1994-05-23) - 27 May 1994 (1994-05-27), SAN DIEGO (US), pages 187 - 190, XP000527267 * |
R. KNERR: "A MICROWAVE CIRCULATOR THAT'S SMALLER THAN A QUARTER", BELL LABORATORIES RECORD., vol. 51, no. 3, March 1973 (1973-03-01), MURRAY HILL, NEW JERSEY US, pages 79 - 84, XP002058969 * |
WEIGEL R ET AL: "NARROW-BAND YBCO SUPERCONDUCTING PARALLEL-COUPLED COPLANAR WAVEGUIDE BAND-PASS FILTERS AT 10 GHZ", 1993 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM-DIGEST, vol. 3, 14 June 1993 (1993-06-14), ATLANTA (US), pages 1285 - 1288, XP000481232 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001257630A (ja) * | 2000-02-28 | 2001-09-21 | Illinois Super Conductor Corp | 無線通信システム |
Also Published As
Publication number | Publication date |
---|---|
EP0962031A1 (de) | 1999-12-08 |
JP2001513279A (ja) | 2001-08-28 |
US6307444B1 (en) | 2001-10-23 |
CA2277996A1 (en) | 1998-09-03 |
DE19707675A1 (de) | 1998-08-27 |
EP0962031B1 (de) | 2002-03-06 |
DE59706581D1 (de) | 2002-04-11 |
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