DE603375C - Piezoelectric coupling arrangement for intermediate or high frequency leading circles - Google Patents
Piezoelectric coupling arrangement for intermediate or high frequency leading circlesInfo
- Publication number
- DE603375C DE603375C DEG78478D DEG0078478D DE603375C DE 603375 C DE603375 C DE 603375C DE G78478 D DEG78478 D DE G78478D DE G0078478 D DEG0078478 D DE G0078478D DE 603375 C DE603375 C DE 603375C
- Authority
- DE
- Germany
- Prior art keywords
- crystal
- coupling arrangement
- high frequency
- electrodes
- circles
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezo-electric or electrostrictive material
- H03H9/56—Monolithic crystal filters
Description
Piezoelektrische Kopplungsanordnung für Zwischen- oder Hochfrequenz führende Kreise Es ist bekannt, zwecks Erzielung einer höheren Selektivität einen piezoelektrischen Kristall als Kopplungsmittel zwischen zwei Hochfrequenz führenden Kreisen in Empfängern für hochfrequente Schwingungen zu verwenden. Die zu siebende Hochfrequenz wird, wie in Abb. i dargestellt, mittels eines Kondensatorplattenpaares b, c zur Erregung an den Kristall gelegt. Mittels eines zweiten an den Kristall angekoppelten Kondensators e, f wird dann die gesiebte Hochfrequenz den nachgeschalteten Gebilden zugeführt. Es ist auch bekannt, mehrere Kristalle zusammenzuschalten, um Bandfilterwirkung zu erzielen.Piezoelectric coupling arrangement for intermediate or high frequency leading circles It is known to use a piezoelectric crystal as a coupling means between two high frequency leading circles in receivers for high frequency oscillations in order to achieve a higher selectivity. As shown in Fig. I, the high frequency to be screened is applied to the crystal for excitation by means of a pair of capacitor plates b, c. The filtered high frequency is then fed to the downstream structures by means of a second capacitor e, f coupled to the crystal. It is also known to interconnect several crystals in order to achieve a band filter effect.
Diese Anordnungen leiden an dem übelstand, daßi ;eine mit der Frequenz wachsende direkte Übertragung der Schwingungen von dem Erregungskondensator b, c auf den Kondensator e, f auftritt. Denn das räumliche Aneinanderrücken dieser beiden Kondensatoren bedingt eine Vergrößerung der statischen Kapazität zwischen den beiden Kondensatoren.These arrangements suffer from the disadvantage that there is a direct transmission of the vibrations from the excitation capacitor b, c to the capacitor e, f , which increases with frequency. Because the spatial proximity of these two capacitors causes an increase in the static capacitance between the two capacitors.
Um die störende Kapazität bei piezoelektrischen Siebanordnungen unwirksam zu machen, sind Mittel angewendet worden, die auf eine Brückenschaltung mit Neutralisation der störenden Kapazität abzielen. Diese Anordnungen bedingen einen erheblichen Aufwand und sind außerdem (Brückenabgleichung) schwer zu bedienen.To the disruptive capacitance in piezoelectric sieve arrangements ineffective To make it, means have been applied to a bridge circuit with neutralization target the disruptive capacity. These arrangements require considerable effort and are also difficult to use (bridge balancing).
Diese Nachteile vermeidet die vorliegende Erfindung, deren Wirkungsweise; wie folgt, an Hand der Abbildungen, die .eine beispielsweise Ausführungsform darstellen, näher erläutert ist.The present invention avoids these disadvantages, its mode of operation; as follows, on the basis of the figures, which represent an exemplary embodiment, is explained in more detail.
Der Kristall a (Abb. i) wird in bekannter Weise durch die Elektroden b, c erregt. Die Kristallschwingung breitet sich mechanisch im Kristall aus, so daßi am Querschnitt des Kristalls bei P nur die mechanische, elastische Kristallbewegung existiert. Erfindungsgemäß wird nun eine Abschirmung oder Panzerung mittels der Wand g vorgenommen. Die Erregungselektroden b, c vermögen nunmehr den Ableitungskondensator e, t nicht zu erregen. Vielmehr kann nur der Kristall, der in bekannter Weise piezoelektrische Ladungen bildet, auf den Ableitungskondensator wirksam werden.The crystal a (Fig. I) is excited in a known manner by the electrodes b, c. The crystal oscillation spreads mechanically in the crystal, so that only the mechanical, elastic crystal movement exists at the cross section of the crystal at P. According to the invention, shielding or armoring is now carried out by means of the wall g. The excitation electrodes b, c are now unable to excite the discharge capacitor e, t. Rather, only the crystal, which forms piezoelectric charges in a known manner, can act on the discharge capacitor.
Hierdurch ist also die alleinige übertragung durch den Kristall gesichert. .This ensures the sole transmission through the crystal. .
Der Kondensatore, f arbeitet auf die je nach dem Verwendungszweck nachgeschaltete Apparatur, wie Gleichrichter, Verstärker.The condensers, f works on depending on the intended use downstream equipment such as rectifiers, amplifiers.
Die Wirkung der erfindungsgemäßen Gesamtanordnung ist also derartig, daß eine störende Nebenübertragung überhaupt nicht erfolgt und die Energieleitung durch die Anordnung nur vonstatten geht, wenn der Kristall anspricht, ohne daß dabei eine Abglei-. chung ,erforderlich ist.The effect of the overall arrangement of the invention is therefore such that a disturbing side transfer does not take place and the power line by the arrangement only proceeds more as the crystal responds without causing a carry out the adjustment. chung, is required.
In Abb. a ist der Erfindungsgedanke mit besonderer Elektrodenanordnung in beispielsweiser Ausführungsform angegeben. Wie die Abb. z zeigt, wird erfindungsgemäß die Abschirmung der Elektrodenanordnung angepaßt. Bei der Kristallerregung sind u. U. mehrere Elektroden notwendig; in allen Fällen werden die erregenden gegenüber den erregten Elektroden abgeschirmt.Fig. A shows the idea of the invention with a special electrode arrangement given in an exemplary embodiment. As the Fig. Z shows, according to the invention the shielding of the electrode arrangement adapted. At the crystal excitation are possibly several electrodes required; in all cases it will be exciting shielded from the excited electrodes.
Um die Dämpfung des Kristalls gegebenenfalls herabzusetzen, bringt man die Anordnung in ein Vakuumrohr.In order to reduce the attenuation of the crystal, if necessary, brings you put the assembly in a vacuum tube.
Die dargestellten Anordnungen sind nur Ausführungsbeispiele. Der ihnen zugrunde liegende Gedanke der Abschirmung der erregenden und erregten Platten kann selbstverständlich überall da An-,vendung finden, wo piezoelektrische Kristalle zu Siebzwecken Verwendung finden.The arrangements shown are only exemplary embodiments. Of them underlying idea of shielding the exciting and excited plates can Of course, they are used wherever piezoelectric crystals are used find use for sieving purposes.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEG78478D DE603375C (en) | 1931-01-10 | 1931-01-10 | Piezoelectric coupling arrangement for intermediate or high frequency leading circles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEG78478D DE603375C (en) | 1931-01-10 | 1931-01-10 | Piezoelectric coupling arrangement for intermediate or high frequency leading circles |
Publications (1)
Publication Number | Publication Date |
---|---|
DE603375C true DE603375C (en) | 1934-09-29 |
Family
ID=7136678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEG78478D Expired DE603375C (en) | 1931-01-10 | 1931-01-10 | Piezoelectric coupling arrangement for intermediate or high frequency leading circles |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE603375C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE755422C (en) * | 1950-10-24 | 1953-02-16 | Western Electric Co | Electric broadband wave filter in the form of a cross-link network with mechanically vibrating elements |
US3047823A (en) * | 1959-05-07 | 1962-07-31 | Panoramic Radio Products Inc | Tunable piezo-electric crystal |
DE1234276B (en) * | 1954-06-29 | 1967-02-16 | Gen Electric | Piezoelectric transformation arrangement with an oscillating body made of pre-polarized ferroelectric material |
-
1931
- 1931-01-10 DE DEG78478D patent/DE603375C/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE755422C (en) * | 1950-10-24 | 1953-02-16 | Western Electric Co | Electric broadband wave filter in the form of a cross-link network with mechanically vibrating elements |
DE1234276B (en) * | 1954-06-29 | 1967-02-16 | Gen Electric | Piezoelectric transformation arrangement with an oscillating body made of pre-polarized ferroelectric material |
US3047823A (en) * | 1959-05-07 | 1962-07-31 | Panoramic Radio Products Inc | Tunable piezo-electric crystal |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE112014005637B4 (en) | Frequency variable filter | |
DE4447740B4 (en) | Acoustic surface wave filter | |
DE69934765T2 (en) | Acoustic surface wave filter | |
DE2133634C3 (en) | Electrical filter based on the surface wave principle, method for its adjustment and filter filter | |
DE102004020183B4 (en) | Surface acoustic wave resonator filter with longitudinally coupled transducers | |
DE10158109B4 (en) | Piezoelectric filter with several coupled longitudinal modes | |
DE102017108105B4 (en) | Filter device for elastic waves | |
DE603375C (en) | Piezoelectric coupling arrangement for intermediate or high frequency leading circles | |
EP0104314A2 (en) | Surface-acoustic wave filter | |
DE2363701A1 (en) | ACOUSTIC SURFACE WAVE FILTER | |
DE2001433C3 (en) | Band pass filter | |
DE3832943A1 (en) | SURFACE WAVE FILTER | |
DE10026074B4 (en) | Recursive SAW filter with a small chip length | |
DE10322947A1 (en) | Longitudinally coupled piezoelectric multi-mode bulk wave filter and electronic component | |
DE2054581C3 (en) | Circuit arrangement of a two-circuit, inductively coupled band filter | |
DE759014C (en) | Piezoelectric transmitter crystal | |
DE1814954A1 (en) | Electrical filter filter, consisting of two electromechanical filters with different bandwidths | |
DE743934C (en) | Wave filter made up of several elements connected in series, which all have the same transmission range and which each contain piezoelectric crystals as impedances | |
AT130393B (en) | Modulated waveform receiver with a piezoelectric device. | |
DE603006C (en) | Oscillator excited by a piezoelectric crystal resonator | |
DE744150C (en) | Bandpass according to the chain principle of mutually adapted links (with regard to the wave resistance) of different damping behavior, which only consist of parallel resonance circles | |
DE2347025C3 (en) | Damping Pole Monolithic Crystal Fltter | |
DE19623144A1 (en) | Microwave filter, consisting of several coaxial resonators | |
DE866804C (en) | Electric vibrator | |
DE747102C (en) | Circuit arrangement for ultra-short wave broadband amplifiers |