DE4009076C2 - - Google Patents
Info
- Publication number
- DE4009076C2 DE4009076C2 DE19904009076 DE4009076A DE4009076C2 DE 4009076 C2 DE4009076 C2 DE 4009076C2 DE 19904009076 DE19904009076 DE 19904009076 DE 4009076 A DE4009076 A DE 4009076A DE 4009076 C2 DE4009076 C2 DE 4009076C2
- Authority
- DE
- Germany
- Prior art keywords
- capacitive
- elements
- longitudinal
- filter
- parallel
- 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
Links
- 230000006978 adaptation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1766—Parallel LC in series path
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1775—Parallel LC in shunt or branch path
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Filters And Equalizers (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
Die Erfindung betrifft ein parametrisches Filter für Fernmeldesysteme mit einer Mehrzahl von Längsgliedern gemäß Oberbegriff des Patentanspruches 1.The invention relates to a parametric filter for Telecommunication systems with a plurality of longitudinal members according to Preamble of claim 1.
Solche Filter sind bekannt, beispielsweise durch die deutsche Patentschrift DE 22 07 572 C2.Such filters are known, for example from the German one Patent specification DE 22 07 572 C2.
Schmalbandige Bandpässe im Frequenzbereich zwischen 30 MHz bis 600 MHz werden häufig mittels kapazitiv parallel gekoppelter Parallelkreise im Querzweig realisiert. Hier liegen alle Filterpole bei Null bzw. im Unendlichen, die Verluste im Durchlaßbereich sind deshalb sehr gering. Solche Filter haben aber den Nachteil eines (maximal flachen) Buttworth-Filters, welches eine geringe Dämpfung im Sperrbereich und einen abgerundeten Verlauf des Frequenzganges im Durchlaßbereich aufweist. Aufgrund der Verknüpfung zwischen Welligkeit und Anpassung zeigt auch die Eingangs- und Ausgangsanpassung einen abgerundeten Verlauf zum Bandende hin.Narrowband bandpasses in the frequency range between 30 MHz to 600 MHz are often coupled using capacitively parallel Parallel circles realized in the cross branch. Everyone is here Filter poles at zero or at infinity, the losses in Passband are therefore very small. Have such filters but the disadvantage of a (maximum flat) buttworth filter, which has a low attenuation in the blocking area and a rounded course of the frequency response in the pass band having. Because of the link between ripple and Adjustment also shows the input and output adjustment one rounded course towards the end of the tape.
Ein weiterer Nachteil dieses Filters liegt im unsymmetrischen Verlauf seines Frequenzganges, bedingt durch die ungleiche Anzahl von Polen bei Null bzw. bei Unendlich.Another disadvantage of this filter is that it is unbalanced Course of its frequency response, due to the uneven Number of poles at zero or at infinity.
Die Filter von Tschebyscheff und Cauer sowie Wellenparameterfilter weisen solche Nachteile nicht auf. Jedoch steigen bei diesen Filtern durch eine hohe Anzahl von Polen im endlichen Frequenzbereich die Verluste stark an. Dies gilt besonders für schmalbandige Filter. Beim schmalbandigen Filter liegen die Grenzfrequenzen nahe beieinander, deshalb können die Verluste auch in der Bandmitte wirksam werden.The filters from Tschebyscheff and Cauer as well Wave parameter filters do not have such disadvantages. However, these filters increase due to a large number of Poland's losses in the finite frequency range increased sharply. This applies particularly to narrowband filters. In the narrow band Filters are the cutoff frequencies close to each other, therefore the losses can also take effect in the middle of the band.
Außerdem ist es bei vielen Filtern dieser Art schwierig, besonders bei schmalbandigen Bandpässen, brauchbare Werte der Bauelemente im Radiofrequenzbereich zu erhalten.In addition, many filters of this type make it difficult to especially for narrowband bandpasses, useful values of Obtain components in the radio frequency range.
Der vorliegenden Erfindung lag die Aufgabe zugrunde, ein Filter der eingangs genannten Art zu finden, welches die Vorteile der beiden beschriebenen Filterstrukturen aufweist, wobei der Aufwand zur Realisierung eines solchen Filters nicht sehr hoch sein soll.The present invention was based on the object Find filters of the type mentioned, which the Has advantages of the two filter structures described, but the effort to implement such a filter is not should be very high.
Die Lösung dieser Aufgabe erfolgt durch die kennzeichnenden Merkmale des Patentanspruches 1. Vorteilhafte Ausgestaltungen ergeben sich durch die Unteransprüche.This problem is solved by the characteristic Features of claim 1. Advantageous refinements result from the subclaims.
Das erfindungsgemäße Filter weist die Vorteile einer hohen Selektion, einer geringen Welligkeit im Durchlaßbereich, eines symmetrischen Verlaufs des Frequenzganges sowie geringe Durchgangsverluste auf. Außerdem weist das erfindungsgemäße Filter eine gute Anpassung sowohl am Eingang als auch am Ausgang auf. Die Werte für die einzelnen Bauelemente sind realisierbar, so daß das Filter auch bei sehr hohen Frequenzbereichen noch eingesetzt werden kann.The filter according to the invention has the advantages of a high Selection, a slight ripple in the pass band, one symmetrical course of the frequency response and low Continuity losses. In addition, the invention Filters a good match both at the entrance and at the Exit on. The values for the individual components are realizable, so that the filter even at very high Frequency ranges can still be used.
Ein weiterer Vorteil liegt darin, daß die Querinduktivitäten nicht abgleichbar sein müssen, sondern mit Festwerten bestückt werden können. Eventuelle Fehltoleranzen dieser Induktivitätswerte können durch die abgleichbaren Längsinduktivitäten kompensiert werden.Another advantage is that the cross-inductors do not have to be matchable, but have fixed values can be. Possible fault tolerances of this Inductance values can be compared through the Longitudinal inductors are compensated.
In Fig. 1 ist das Schaltbild eines erfindungsgemäßen Filters mit fünf Längsgliedern gezeichnet; zwei davon sind kapazitive und drei Parallel-Resonanzkreise, wobei jeweils zwei benachbarte Parallel-Resonanzkreis-Längsglieder durch ein kapazitives Längsglied gekoppelt sind. Vier Querglieder sind Parallel-Resonanzkreise und zwei Querglieder kapazitiv, welch letztere vor und hinter dem ersten, also am Eingang sich befindlichen Parallel-Resonanz-Längsglied geschaltet sind.In Fig. 1, the circuit diagram of a filter according to the invention with five longitudinal members is drawn; two of them are capacitive and three parallel resonance circuits, with two adjacent parallel resonance circuit series elements being coupled by a capacitive series element. Four cross-links are parallel resonance circuits and two cross-links are capacitive, the latter being connected in front of and behind the first parallel-resonance longitudinal link located at the input.
In Fig. 3 ist der Frequenzgang des Dämpfungsverlaufs im gesamten Bereich und in Fig. 4 in einem vergrößerten Maßstab die Durchlaßdämpfung dargestellt. In Fig. 5 schließlich ist der Verlauf der Anpassung über der Frequenz dargestellt. Die drei letztgenannten Verläufe beziehen sich auf das Filter nach Fig. 1. Eine Liste der errechneten Werte für die Induktivitäten und Kapazitäten des Filters nach Fig. 1 ist in Fig. 2 aufgelistet.In Fig. 3 the frequency response of the attenuation curve is shown in the entire area and in Fig. 4 on an enlarged scale the transmission loss. In Fig. 5, finally, the course of the adaptation is shown over frequency. The three last-mentioned curves relate to the filter according to FIG. 1. A list of the calculated values for the inductances and capacitances of the filter according to FIG. 1 is listed in FIG. 2.
Claims (3)
daß insgesamt fünf Längsglieder vorgesehen sind, nämlich zwei kapazitive und drei Parallel-Resonanzkreise,
daß zwei benachbarte Parallel-Resonanzkreise jeweils durch zwei kapazitive Längsglieder gekoppelt sind,
daß vier Querglieder als Parallel-Resonanzkreise und zwei kapazitive Querglieder vorgesehen sind und
daß das erste der beiden kapazitiven Querglieder am Filtereingang vor dem ersten Parallel-Resonanzkreis-Längsglied und das zweite kapazitive Längsglied hinter dem ersten Parallel-Resonanzkreis-Längsglied angeordnet sind.1. Parametric filter for telecommunication systems with a plurality of longitudinal elements, between which transverse elements are connected, at least one of the longitudinal elements being a parallel resonance circuit, with capacitive transverse and longitudinal elements, characterized in that
that a total of five longitudinal elements are provided, namely two capacitive and three parallel resonance circuits,
that two adjacent parallel resonance circuits are each coupled by two capacitive series elements,
that four cross members are provided as parallel resonant circuits and two capacitive cross members and
that the first of the two capacitive transverse elements are arranged at the filter input in front of the first parallel resonant circuit longitudinal element and the second capacitive longitudinal element behind the first parallel resonant circuit longitudinal element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19904009076 DE4009076A1 (en) | 1990-03-21 | 1990-03-21 | Narrow bandpass filter for HF transmission - achieves symmetrical roll=off and min. insertion loss using 5 series element networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19904009076 DE4009076A1 (en) | 1990-03-21 | 1990-03-21 | Narrow bandpass filter for HF transmission - achieves symmetrical roll=off and min. insertion loss using 5 series element networks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE4009076A1 DE4009076A1 (en) | 1991-09-26 |
| DE4009076C2 true DE4009076C2 (en) | 1992-10-29 |
Family
ID=6402736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19904009076 Granted DE4009076A1 (en) | 1990-03-21 | 1990-03-21 | Narrow bandpass filter for HF transmission - achieves symmetrical roll=off and min. insertion loss using 5 series element networks |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE4009076A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69515125T2 (en) * | 1994-10-14 | 2000-09-28 | Conductus, Inc. | FREQUENCY TRANSFER DEVICE AND METHOD FOR NARROW-BAND FILTER DESIGNS |
| US6529750B1 (en) | 1998-04-03 | 2003-03-04 | Conductus, Inc. | Microstrip filter cross-coupling control apparatus and method |
| WO2002013382A2 (en) | 2000-08-07 | 2002-02-14 | Conductus, Inc. | Varactor tuning for a narrow band filter |
| US7437187B1 (en) | 2000-10-30 | 2008-10-14 | Conductus, Inc. | Superconductive filter with capacitive patches providing reduced cross-coupling |
| JP3949976B2 (en) * | 2001-04-04 | 2007-07-25 | 株式会社村田製作所 | Lumped constant filter, antenna duplexer, and communication device |
| US7610072B2 (en) | 2003-09-18 | 2009-10-27 | Superconductor Technologies, Inc. | Superconductive stripline filter utilizing one or more inter-resonator coupling members |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL79446C (en) * | 1949-06-01 | |||
| DE2207572C2 (en) * | 1972-02-18 | 1984-03-01 | ANT Nachrichtentechnik GmbH, 7150 Backnang | IF bandpass filter circuit with resonant reactance network - capacitively coupled between input and output resonant circuits and generating single attenuation pole |
-
1990
- 1990-03-21 DE DE19904009076 patent/DE4009076A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE4009076A1 (en) | 1991-09-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OP8 | Request for examination as to paragraph 44 patent law | ||
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8320 | Willingness to grant licenses declared (paragraph 23) | ||
| 8327 | Change in the person/name/address of the patent owner |
Owner name: ROBERT BOSCH GMBH, 70469 STUTTGART, DE |
|
| 8339 | Ceased/non-payment of the annual fee |