DE1266374B - Votable management team - Google Patents

Description

Tunable Circuitry The present invention relates to on a tunable line circuit, with a voltage-dependent line in the course of a line Capacitance, in particular a capacitance-varying diode, is switched on and on A compensation wire for setting the line inductance is connected to this conductor is.

It is already known when a pot circle is parallel to the inner conductor to connect a wire and by bending it the inductance of the inner conductor to make adjustable. In the case of tunable line circuits of the type described, because of the large tolerance with which the capacitance-varying diodes can only be produced at the moment are, the inductance of the line circuit can be adjusted within wide limits. For example it is necessary to make the inductance adjustable by ± 20%.

It is therefore an object of the invention to find a way through which such a large line inductance variation can be achieved.

According to the invention this is achieved in that each approximately in the In the middle of the two conductors a U-shaped wire bracket is connected around his Connection points is pivotable or bendable. This gives you, for example with a 2/4-wire circle when bending the wire bracket towards the base, the highest Inductance and when bending to the high point the minimum inductance. The thereby The inductance variation achieved is so great that the tolerances of the currently usual Capacity variation diodes can be compensated for with certainty.

Further advantageous details of the invention are set out below Hand of the embodiments illustrated in the drawing described.

F i g. 1 shows a 44-cup circle in a perspective view, FIG. 2 and 3 each a plan view of the same with different wire bracket positions and F i g. 4 and 5 each a plan view with a particular diode arrangement and different ones Wire bracket position.

1 is an outer conductor and 2 is an inner conductor as a pot circle trained line structure referred to. The embodiment shown represents one 44 resonator. The inner conductor 2 is here directly connected to the outer conductor. A capacitance variation diode 3 is soldered to the free inner conductor part its other end via a blocking capacitor 4 is high-frequency to ground. The blocking capacitor 4 is preferably designed as a disc capacitor, its one pad is soldered directly to the outer conductor 1, while the other pad at the same time a voltage lead 5 for the control voltage UR is soldered on.

According to the invention is approximately in the middle of the inner conductor 2 and on the opposite point of the outer wall 1 a wire bracket 6 soldered or in a suitable Way attached, the position of which to the inner conductor 2 can be changed. The change of position is expediently carried out by bending the wire bracket, preferably in the area of the Fastening points on the conductors 1 and 2. In the embodiment shown, the Capacity variation diode 3 with its leads 7, 8 still as an inner conductor. Of the Wire bracket 6 therefore does not have to be arranged in the middle of the inner conductor 2, but its attachment points can expediently to the capacitance variation diode 3 to be shifted.

The F i g. 2 shows an embodiment in which the wire bracket 6 is bent towards the base. In this position the line inductance is on largest, because then the area that determines the inductance, which is caused by the wire loop 6 and the upper left pot circle part is formed, has a maximum.

In the case of the one shown in FIG. 3 is the wire bracket 6 bent upwards towards the capacitance variation diode 3 and runs practically parallel to the inner conductor 2. The area that determines the inductance is the smallest, so that the inductance is now at a minimum.

In the positions between the in F i g. 2 and 3 shown extreme positions the inductance values can be varied over a wide range.

In the case of the one shown in FIG. 3 and 4 illustrated embodiment is the Capacity variation diode 3 approximately perpendicular from the inner conductor 2 to the outer conductor 1 arranged. As a result, when the wire clip 6 to the capacitance-varying diode 3 bent towards is, one opposite to FIG. 3 even smaller area effective, so that a greater range of variation for the inductance of the conduction circuit occurs.

The invention is not limited to the exemplary embodiment with a 1/4 pot circle, but can also be used with other line resonators, -z. B. at A / 2-pot circles or with cable circles executed in stripline technology, use Find.

Claims (5)

Claims: 1. Votable executive committee, whereby in the course of a Line has a voltage-dependent capacitance, in particular a capacitance-varying diode, is switched on and on this a balancing wire for setting the line inductance is connected, characterized in that each approximately in the middle of the two Head a U-shaped wire bracket is connected to its connection points is pivotable or bendable. 2. line circuit according to claim 1, characterized in that that the wire bracket (6) can be guided along the capacitance variation diode (3): 3. line circuit according to claim 1 or 2, characterized in that the line beis has an inner conductor (2) and an outer conductor (1) and the wire bracket (6) is arranged between the inner conductor (2) and outer conductor (1). 4th management group after one of claims 1 to 3, characterized in that the capacitance-varying diode (3) forms part of a conductor (2). 5. Management committee according to one of the claims 1 to 4, characterized in that at least one further wire bracket (6), in particular opposite to the former.