DE880607C - Coaxial high frequency line - Google Patents

Coaxial high frequency line

Info

Publication number
DE880607C
DE880607C DET2552D DET0002552D DE880607C DE 880607 C DE880607 C DE 880607C DE T2552 D DET2552 D DE T2552D DE T0002552 D DET0002552 D DE T0002552D DE 880607 C DE880607 C DE 880607C
Authority
DE
Germany
Prior art keywords
point
line
wave resistance
high frequency
coaxial high
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
Application number
DET2552D
Other languages
German (de)
Inventor
Hans Heinrich Dr Meinke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefunken AG
Original Assignee
Telefunken AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefunken AG filed Critical Telefunken AG
Priority to DET2552D priority Critical patent/DE880607C/en
Application granted granted Critical
Publication of DE880607C publication Critical patent/DE880607C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
    • H01P5/022—Transitions between lines of the same kind and shape, but with different dimensions
    • H01P5/026—Transitions between lines of the same kind and shape, but with different dimensions between coaxial lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor

Landscapes

  • Control Of Motors That Do Not Use Commutators (AREA)

Description

Bei koaxialen Hochfrequenzleitungen ist es häufig erforderlich, daß sich die Abmessungen, wie Abb. i zeigt, an einer Stelle möglichst sprunghaft unter Beibehaltung des Wellenwiderstandes- ändern. Bleibt hierbei das Verhältnis der Durchmesser von Innenleiter und Außenleiter konstant (dl/Dl = d2/D2), so ist der Wellenwiderstand der beiden Leitungsabschnitte J, Al und J2 A2 gleich groß. Trotzdem tritt, wie eine nähere Untersuchung zeigt und auch an sich bereits bekannt ist, an der Übergangsstelle eine Wellenreflexion auf, die auf der vergrößerten Kapazität C zwischen den Kanten der Sprungstellen beruht. Auch durch kegelförmige Ausbildung der Übergänge läßt sich eine Reflexion nicht ganz vermeiden; außerdem ist die Herstellung dann wesentlich schwieriger. Bei einer bekannten Anordnung sollen diese Reflexionen durch entgegengesetzte Reflexionen an der gleichen Stelle oder durch gleichartige Reflexionen an einer um 2/q. (A, = Arbeitswellenlänge) entfernten Stelle ausgeglichen werden. Die vorliegende Erfindung gibt nun eine Möglichkeit an, bei welcher die Reflexionen auf eine außerordentlich einfache und weitgehend frequenzunabhängige Weise vermieden werden können.In the case of coaxial high-frequency lines, it is often necessary for the dimensions, as Fig. I shows, to change as suddenly as possible at one point while maintaining the characteristic impedance. If the ratio of the diameter of the inner conductor and outer conductor remains constant (dl / Dl = d2 / D2), the wave resistance of the two line sections J, Al and J2 A2 is the same. Nevertheless, as a closer examination shows and is already known per se, a wave reflection occurs at the transition point, which is based on the increased capacitance C between the edges of the jump points. Even if the transitions are conical, a reflection cannot be completely avoided; in addition, the production is then much more difficult. In a known arrangement, these reflections should be caused by opposing reflections at the same point or by reflections of the same type at around 2 / q. (A, = working wavelength) distant point are compensated. The present invention now provides a possibility in which the reflections can be avoided in an extremely simple and largely frequency-independent manner.

Gemäß der Erfindung wird die Stelle, an der der Innenleiter seine Querschnittsabmessungen ändert, gegenüber der Stelle, an der der Außenleiter seine Ouerschnittsabmessungen ändert, um ein derartiges Stück (l, Abb.2) in Richtung auf den Leitungsabschnitt größerer Durchmesserwerte verschoben, daß der Wellenwiderstand des durch den Abschnitt zwischen den beiden Sprungstellen gebildeten Vierpols (Abb. 3) gleich dem Wellenwiderstand Z der Leitung ist. Durch die gegenseitige Verschiebung der Sprungstellen wird die Kapazität C zwischen den Kanten verringert und gleichzeitig eine Induktivität L in Reihe eingeschaltet, welche durch den verlängerten dünneren Innenleiter gebildet wird. Für einen ganz bestimmten Wert von C ist der Wellenwiderstand hEC des durch L und C gebildeten Vierpols gerade gleich dem Leitungswellenwiderstand Z. Bei einem praktischen Ausführungsbeispiel betrug die Länge L etwa i/8 des größeren Außendurchmessers D2. Die Anordnung arbeitet für alle Wellenlängen bis zur Grenzwellenlänge des Vierpols gleichmäßig gut.According to the invention, the point at which the inner conductor changes its cross-sectional dimensions compared to the point at which the outer conductor changes its cross-sectional dimensions is shifted by such a piece (1, Fig. 2) in the direction of the line section of larger diameter values that the wave resistance of the quadrupole formed by the section between the two jump points (Fig. 3) is equal to the wave resistance Z of the line. Due to the mutual displacement of the jump points, the capacitance C between the edges is reduced and at the same time an inductance L is switched on in series, which is formed by the lengthened, thinner inner conductor. For a very specific value of C, the wave resistance hEC of the quadrupole formed by L and C is exactly equal to the line wave resistance Z. In a practical embodiment, the length L was approximately 1/8 of the larger outer diameter D2. The arrangement works equally well for all wavelengths up to the cut-off wavelength of the quadrupole.

Claims (2)

PATENTANSPRÜCHE: i. Koaxiale Hochfrequenzleitung, deren Abmessungen sich an einer Stelle unter Beibehaltung des Wellenwiderstandes ändern, dadurch gekennzeichnet, daß die Stelle, an der der Innenleiter seine Querschnittsabmessungen ändert, gegenüber der Stelle, an der der Außenleiter seine Querschnittsabmessungen ändert, um ein derartiges Stück (l, Abb. 2) in Richtung auf den Leitungsabschnitt größeren Abmessungen verschoben ist, daß der Wellenwiderstand des durch den Abschnitt zwischen den beiden Sprungstellen gebildeten Vierpols (Abb.3) gleich dem Wellenwiderstand der Leitung ist. PATENT CLAIMS: i. Coaxial high frequency line, its dimensions change at one point while maintaining the wave resistance, characterized in that that the point at which the inner conductor changes its cross-sectional dimensions, opposite the point at which the outer conductor changes its cross-sectional dimensions by one such piece (1, Fig. 2) in the direction of the line section of larger dimensions is shifted that the wave resistance of the section between the two Jump points formed quadrupole (Fig.3) equal to the wave resistance of the line is. 2. Leitung nach Anspruch i, dadurch gekennzeichnet, daß die Länge (l) des Stückes zwischen den Sprungstellen in der Größenordnung eines Achtels des größeren Außenleiterdurchmessers (D2) liegt.2. Line according to claim i, characterized in that the length (l) of the piece between the jump points in the order of one eighth of the larger outer conductor diameter (D2) lies.
DET2552D 1942-07-02 1942-07-03 Coaxial high frequency line Expired DE880607C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET2552D DE880607C (en) 1942-07-02 1942-07-03 Coaxial high frequency line

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE234481X 1942-07-02
DET2552D DE880607C (en) 1942-07-02 1942-07-03 Coaxial high frequency line

Publications (1)

Publication Number Publication Date
DE880607C true DE880607C (en) 1953-06-22

Family

ID=25765743

Family Applications (1)

Application Number Title Priority Date Filing Date
DET2552D Expired DE880607C (en) 1942-07-02 1942-07-03 Coaxial high frequency line

Country Status (1)

Country Link
DE (1) DE880607C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1122116B (en) * 1960-07-07 1962-01-18 Rohde & Schwarz Connection piece between coaxial lines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1122116B (en) * 1960-07-07 1962-01-18 Rohde & Schwarz Connection piece between coaxial lines

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