EP1250721B1 - Circuit for dividing or bringing together high-frequency performances - Google Patents

Abstract

An improved circuit for splitting or for joining radio-frequency powers, having a main line (7) which is connected between an input port (1) and a first output port (3), and having a branch line (11) which branches off from the main line at a branching point (9) and leads to a second output port (5), is distinguished in that a compensating element (61) is provided which, in particular, is adjustable or can be fitted and removed differently, and which can be varied, varying the capacitance of at least one capacitor (C1, C2, C3) which is connected in the branch line (11), and/or varying the electrical length of a spur line (37) which is coupled to the branch line (11), such that the change in the magnitude of the power which is tapped off also makes it possible to compensate at the same time for the resistance change which is caused by the change in the power split.

Description

The invention relates to a circuit for dividing or Merging high-frequency services according to the generic term of claim 1.

Circuits for dividing or merging high-frequency power are for example as so-called Bridge circuits or known as Wilkinson couplers. she are mainly used in parallel for high-frequency technology used by radio frequency transmitters or antennas.

A generic circuit for splitting and merging of high frequency power is for example from the brochure Kathrein-Werke KG "Base Station Antennas for Mobile Communication, catalog 03.99 ".

The circuit is e.g. arranged in an elongated housing, on one end the so-called summentor (Entrance) and at the opposite end, for example a first single gate and at a right angle the second single gate is provided on the adjacent transverse side can be.

A power split is made up of various resistances realized on the single gate (parallel connection of different Einzeltorwiderstände). The first single goal remains unchanged. The second single goal will be there e.g. undergo a λ / 4 transformation. In other words is the power sharing according to the state of the art realized by a different impedance Z ("λ / 4 transformation"). The power sharing has however Retroactive effect on the entrance. Above all, in If there are different division ratios, do not can be set variably so that for the different Power sharing ratios different Types and devices must be made available.

From US 3,324,421 a circuit for dividing or Merging high-frequency powers known at the between an entrance and a first exit gate Main line is switched from at a branch branches off a branch line. With this circuit an adjustable decoupling element is provided, which§ by changing the capacity of one in the branch line switched capacitor the size of the tapped power certainly. Depending on the measuring frequency, this can result in narrowband the decoupling element can be adjusted, i.e. it will only the measuring branch adapted. This decoupling element however, has repercussions, especially at higher frequencies on the impedance of the main line.

It is known from US 2,657,362, for example the Impedance of an antenna due to a mechanically modified one Combination of inductors and capacitors to one adjust other impedance.

A generic circuit for power sharing is also known for example from US-A-2,667,619 become. This circuit includes one between one Main line switched input and a first output gate and one from the main at a junction branching off and to a second exit door leading branch. Furthermore, one with the branch line coupled stub line provided. According to this There are serial capacities in the outputs with an electrically effective length of λ / 4 or λ / 2 according to the working frequency. It is a slidable tuning element is provided which an actuator at the same time in the main line and the branch section engaging in its longitudinal direction can be adjusted. That is, the function of the distributor is due to the simultaneous enlargement and reduction of the series capacities realized.

A largely similar circuit is also known from US-A-2,605,357 known. In deviation from the above Publication US-A-2,667,619 is the change the serial capacity not by a longitudinal movement of the Inner conductor, but by rotating coupling surfaces realized.

The object of the present invention is therefore based on this one of the generic state of the art improved circuit for power sharing, in particular an improved variable circuit for splitting or Merging high-frequency services to create.

The task is according to the invention in accordance with the claim 1 specified features solved. Advantageous designs the invention are specified in the subclaims.

The circuit arrangement according to the invention is not only new, but in their overall structure and in terms of the advantages that can be achieved thereby are extremely surprising. Because by means of the circuit arrangement according to the invention in a preferred embodiment possible a variable Realization of performance without realizing thereby changing the input impedance. This is according to the invention through a combination of variable coupling capacities and a variable stub line, both elements preferably with a common control element can be varied.

The division of benefits is preferably such that from a continuous RF line to a defined one Place another line which is capacitive is coupled. It will be a transformation for the Resistance adjustment at the input or sum gate. realized, without - as mentioned - an impact on or would result in a change in the input impedance. At the decoupled branch there is a frequency compensation or frequency pre-distortion. According to the invention now a change in the distribution of benefits easy adjustment of an intended setting or Adjustment member are carried out, and without retroactive effect to the input impedance. For different Power sharing ratios are now according to the invention not just different type devices, but only a differently adjustable type is necessary.

The circuit arrangement according to the invention is therefore for the A wide variety of power branches in an HF broadband network to be installed, for example in signal transmission in one building for the various power branches in the individual floors, building complexes etc. Simply by turning an adjusting element can be according to the power split to be made the desired power distribution without problems can be set. Also consider that when wiring a house usually a variety of Distributors are necessary to feed the signals (for example in the basement) on a variety of lines to divide and e.g. on the individual floors of a house may have to be split again to different branch lines with if necessary always carry out different performance shares, so the advantages according to the invention become all the clearer. Because according to the invention there is only a single circuit device for stepless distribution of services in particular necessary, which can be easily adapted to current needs can be set, which is now easy compensation for the different cable lengths, Cable loss etc. is feasible.

The power distribution according to the invention is preferred realized using a matching element, which is arranged in a variable position. Due to the change in location the output is decoupled into the branching Line changed and at the same time according to the invention caused by the changed decoupling Change in resistance compensated. The mechanically changeable Adjustment element can be electrically conductive but it doesn't have to be. A dielectric is the same, for example Adjustment element can be used.

In a particularly preferred embodiment of the invention can the adjusting element in axial extension be arranged for branching line, being transverse plus the one between the entrance gate and the further exit gate (i.e. between the sum and the further single goal) extending main line is arranged.

The desired changed decoupling can preferably be by means of a mechanically adjustable probe be, for example, by radial rotation in their axial position is changeable.

The adjustment element can also be used, for example a different adjustment mechanism different can be set. This is preferred in another Embodiment provided that the actuator on Circuit housing can be adjusted linearly. The adjustment movement is preferably carried out in the axial longitudinal direction of the circuit housing. About this adjustment movement can preferably the inside of the actuator Adjustment movement, i.e. preferably the linear adjustment movement of the adjustment element realized and implemented be, the adjustment movement of the adjustment element perpendicular to the adjustment movement of the actuator. The entire arrangement has the further advantage that for example, a clearly visible scale should be attached can, according to the adjustment position of the adjusting element which division of performance can be read exactly is currently set.

Finally, the translation between the actuator and the adjustment element also take place non-linearly, if this is desired. Otherwise is a linear translation realizable at any time.

The bandwidth of the decoupling unit can be very large for example 45%.

The circuit arrangement according to the invention can be coaxial be constructed. But you can also by discrete components or implemented in circuit board technology.

For the sake of completeness, it is noted that the Circuit according to the invention also several variable Coupling elements to build an n-fold distributor may include.

The circuit according to the invention for dividing or combining high-frequency powers, with a main line or main route (7) connected between an input and a first output port (1, 3), and one branching from the main line at a branching point (9) and into one Branch line (11) guiding second output gate (5) is therefore preferably characterized in that an adjustment element (61), which is adjustable or can be installed and removed differently, is provided which, while changing the capacitance of at least one capacitor connected in branch line (11) ( C ₂ , C ₃ ) and / or change in the electrical length of a stub line (37) coupled to the branch line (11) can be changed in such a way that the change in the size of the branching power can also compensate for the change in resistance caused by the changed power distribution.

Figur 1 :

ein erfindungsgemäßes Ersatzschaltbild mit diskreten Elementen zur Erläuterung der Funktionsweisen des Aufbaus einer erfindungsgemäßen Schaltung zum Aufteilen oder Zusammenführen von Hochfrequenzleistungen;

Figur 2 :

ein Ausführungsbeispiel, welches im wesentlichen Figur 1 entspricht, welches für eine variable, breitbandige Leistungsaufteilung geeignet ist, bei welcher ein gemeinsames Stellglied zur Bewirkung der unterschiedlichen Leistungsaufteilung vorgesehen ist;

Figur 3 :

eine schematische Darstellung zur Erläuterung eines konkreten Ausführungsbeispiels bezüglich eines koaxialen Schaltungsaufbaus;

Figur 4 :

eine schematische Schnittdarstellung durch ein erfindungsgemäßes Ausführungsbeispiel mit entsprechender Grunddarstellung nach Figur 3;

Figur 5 :

eine ausschnittsweise Querschnittsdarstellung durch den verdickten Innenleiter-Abschnitt in Figur 4 mit der dort eingebrachten Querbohrung;

Figur 6 :

eine schematische Seitenansicht des erfindungsgemäßen Gerätes zur Leistungsaufteilung in einer ersten Einstellstellung des Stellgliedes;

Figur 7:

eine zu Figur 6 entsprechende Seitendarstellung, bei welcher das Stellglied zur Erzielung einer anderen Leistungsaufteilung sich in einer zu Figur 6 unterschiedlichen Stellung befindet;

Figur 8 :

eine zu Figur 6 entsprechende Seitendarstellung des erfindungsgemäßen Gerätes teilweise im Längsschnitt;

Figur 9 :

eine zu Figur 7 entsprechende Seitendarstellung des erfindungsgemäßen Gerätes zur Leistungsaufteilung entsprechend der zweiten Schaltstellung gemäß Figur 7, jedoch teilweise im Längsschnitt gezeigt; und

Figur 10 :

eine horizontale Querschnittsdarstellung senkrecht zu den Schnittdarstellungen gemäß Figuren 8 und 9, in der Schaltstellung gemäß Figuren 6 und 8.

The invention is explained in more detail below with reference to drawings. Show in detail

Figure 1:

an equivalent circuit diagram according to the invention with discrete elements to explain the functions of the structure of a circuit according to the invention for dividing or merging high-frequency powers;

Figure 2:

an embodiment which corresponds essentially to Figure 1, which is suitable for a variable, broadband power distribution, in which a common actuator is provided to effect the different power distribution;

Figure 3:

a schematic representation for explaining a specific embodiment with respect to a coaxial circuit structure;

Figure 4:

a schematic sectional view through an embodiment according to the invention with a corresponding basic representation of Figure 3;

Figure 5:

a partial cross-sectional view through the thickened inner conductor section in Figure 4 with the transverse bore made there;

Figure 6:

a schematic side view of the device according to the invention for power distribution in a first setting position of the actuator;

Figure 7:

a side view corresponding to Figure 6, in which the actuator is in a different position to achieve a different power distribution to Figure 6;

Figure 8:

a side view corresponding to Figure 6 of the device according to the invention partially in longitudinal section;

Figure 9:

a side view corresponding to Figure 7 of the device according to the invention for power distribution corresponding to the second switching position according to Figure 7, but partially shown in longitudinal section; and

Figure 10:

a horizontal cross-sectional view perpendicular to the sectional views according to Figures 8 and 9, in the switch position according to Figures 6 and 8.

1 shows an equivalent circuit diagram of a variable, broadband power split circuit shown on the basis of which the basic principle is explained should.

The circuit comprises a first input or sum gate 1 and a first exit or single gate 3 and a second exit or single gate 5.

Between the entrance and the first exit gate 3 is in usually the so-called main line 7 (main line) provided, of which at a branch point 9 a Branch 11 branches. Usually on the second Output gate 5 branches off a power that is less than 50% of the total power fed in at input 1 is.

Between the entrance gate 1 and the junction 9 becomes a system impedance of 50 Q in the main line 7 realized.

The main line 7 consists in principle of one or more RF lines 13 connected in series, ie RF line sections 13.1, 13.2,... To 13.5 in the exemplary embodiment shown. The branch line 11 also consists of a coaxial line with a first HF line section 15.1, a capacitor 18 also identified by the designation C ₃ , a downstream further HF line section 15.2, a further capacitor 22 also designated as a capacitor C ₂ and further downstream HF - Line sections 15.3, 15.4 etc.

Between the first RF line section 15.1 and the first capacitor 18, a first coupling point 27 and between the further capacitor 22 and the subsequent rf line section 15.3, a second coupling point 29, between which in a parallel branch 31 also subsequently partially as a capacitor C ₁ labeled capacitor 33 is connected.

Between the capacitor 18 and the RF line section 15.2 is at the branch 35 provided there open stub 37 provided.

The capacitors 18, 22 mentioned and the electrical ones effective length of the stub 37 are each adjustable variable components. The one in the parallel branch 31 switched capacitor can also be used as a variable Capacitor, it does not have to be.

Through a possibly provided common setting logic or Mechanics can be guaranteed by common Adjusting the variable capacitors and the change the length of the stub 37, which at the second output 5 branching RF power variable and continuous on and can be adjusted, according to the branched Power share pending at the first output 3 Performance is reduced accordingly. The setting takes place without effect and change of the input impedance at entrance 1. In addition, a corresponding Resistor predistortion performed, so total to achieve the desired resistance compensation.

Figure 2 shows another equivalent circuit diagram for the embodiment 1 for a variable, broadband Performance distribution. The unit is dashed 41, which is symbolized by a common actuator ( through the common crossing unit 41 Arrow) to effect a different division of benefits is adjustable.

Based on Figure 2 is also at the junction 9 dotted, that here, too, an additional Stub 42 provided for resistance adjustment can be.

3, the schematic structure is one of the following based on Figures 4 and 5 even more detail discussed embodiment of an inventive Circuit explained using a coaxial structure.

The housing 43 of the circuit arrangement consists, for example from a square tube with hollow cylindrical Interior as outer conductor 13 ", in which a rod-shaped Inner conductor 13 'is passed. On the opposite End faces can therefore at the entrance or at first output gate 1, 3 each have a corresponding coaxial socket be arranged, the inner conductor with the inner conductor 13 'and its outer conductor with the outer conductor 13 " the circuit arrangement are connected.

On the side adjacent to the opposite end 44 is the second near the first exit gate 3 Exit gate 5 provided, which again as HF connection with a corresponding HF socket can be how this is reflected in greater detail the schematic cross-sectional view according to FIG. 4 results.

From the schematic cross-sectional representation according to FIG 4 it can be seen that the main line 7 from the mentioned Coaxial tube 43 is made, the outer conductor 13 " Housing 43 forms the circuit arrangement, and inside The inner conductor 13 'is galvanically separated therefrom as metallic conductive rod is passed. This is the electrically conductive metallic serving as inner conductor 13 ' Bar at least in the area of the entrance gate 1 and first exit gates 3 at the end of the main line 7 in corresponding Insulator supports 46, which are preferably made of Plastic exist, stored and held and thereby by the housing galvanically isolated.

At the level of the second exit gate 5, the electrical gate continuous inner conductor or rod 13 'of the main line 7 a thickened section 45 with a transverse bore 47 on, within which in the embodiment shown a sleeve-shaped insulator 49, preferably made of plastic is incorporated. As from the partial cross-sectional representation (rotated by 90 °) can be seen in Figure 5 is no conductive interruption of the Inner conductor 13 'causes.

The rod-shaped is axially aligned with the transverse bore 47 Inner conductor 15 'of the coaxial connecting line or coaxial connection is provided for the second output gate 5, which is adjacent to the transverse bore 47 in the inner conductor 13 'of the main line 7 a sleeve or cup-shaped End portion 51 includes, in the embodiment shown again with a hollow cylinder inside Insulator 53 is preferably made of plastic.

Axially opposite on the other side of the outer conductor or housing 43 is an actuator 55, shown in Embodiment shown with a spindle 57 to by Rotate a balancing element according to arrow 59 61 increasingly in the axial direction or push back. The actuator 55 with the spindle 57 are not electrically conductive, at least not coupled to the outer conductor 13 ". Via the spindle 57 So that is metallic in the embodiment shown Adjustment element 61 axially adjusted differently, wherein the matching element 61 is the hollow cylindrical one thickened section 45 of the inner conductor 13 'of the main line 7 interspersed and different distances in the hollow cylindrical Inner conductor 15 'engages that of the inner conductor 13 'of the main line is electrically isolated.

The aforementioned capacitor C ₃ (18) is formed by the hollow cylinder or sleeve-shaped body 45 belonging to the inner conductor 13 'of the main line 7 and the cylindrical adjustment element 61 passing through this sleeve-shaped body 45. Since the adjustment element also engages to a different extent in the further sleeve-shaped or sleeve-shaped body 51 which is aligned with the sleeve-shaped body 45, the further capacitor C ₂ (22) is formed between the adjustment element 61 and this sleeve-shaped body 51.

Finally, the two galvanically separated sleeve-shaped body 45 (which is electrically conductively connected to the inner conductor 13 'of the main line 7) and the axially spaced-apart sleeve-shaped body 51 (which is electrically connected to the inner conductor 15' of the branch line 11) likewise already mentioned capacitor C ₁ (33) forms.

As mentioned, the adjusting element is axially adjusted by rotating the adjusting element, as a result of which the capacitor C ₃ and especially C _{2 is} changed. Since the axial distance between the two sleeve-shaped bodies 45, 51 does not change, the capacitor C ₁ formed between these components is unchangeable in this embodiment. The electrically effective length of the open stub 37 is accordingly changed by correspondingly different screwing in and out of the adjustment element, the electrical length of the stub 37 becoming shorter the further the adjustment element 61 engages in the corresponding sleeve-shaped body 51 of the stub.

Instead of the electrically conductive balancing element 61 may also use a non-conductive trim element 61 , which also offers the advantage that the mentioned insulators inside the sleeve or cup-shaped Setting elements 45, 51 are dispensed with in any case can be.

A correspondingly explained broadband and Power distributors that can be set as required easily in a broadband RF range of, for example 800 MHz to 2200 MHz can be used. The Difference in the power distribution ΔP between the exit gate 3 and 5 can be values from 5 dB to 20 dB.

The exemplary embodiment is based on an open stub 37 has been explained. At least in certain applications is also a closed stub 37 possible.

A more concrete one will now be given with reference to FIGS. 6 to 10 Described embodiment, which differs from the previous embodiments mainly because of this distinguishes that the actuator 55 is not considered rotatable actuator 55 'is formed.

A corresponding example according to the invention is shown in FIG Device for power sharing in side view with the in the axial longitudinal direction between the entrance gate 1 and the entrance and exit gate 3 extending in cross section square housing 43 shown.

At the height of the second exit gate, which is aligned transversely to it 5, the linearly adjustable actuator 55 is shown, which is cuboid in shape and the axially extends enclosing housing 43. This cuboid Actuator 55 "is along the arrow representation 71 in the longitudinal direction of the housing 43 is adjustable and is in Figure 6 in its one end position and in Figure 7 in its opposite extreme or end position played.

The cuboid actuator housing 55 "instructs its one actuator side 73 has a rectangular shape, for example Recess or a corresponding field of view on, this recess or field of view 75 a Setting or reading device 77 is assigned in shown embodiment in the form of a foregoing Nose 77 '. Below field of view 75, i.e. the recess 75 is on the outside of the housing wall underneath 43 'of the housing 43 has a scale 79 attached. Corresponding the axial adjustment movement of the actuator 55 'can now be read exactly on the scale 79, like the power distribution according to the setting of the actuator 75 'on the two recesses 3 and 5 is made.

How the adjusting mechanism takes place can be seen from FIGS. 8 to 10 can be seen that the corresponding device partially play on average.

From the sectional view according to Figures 8 and 9 can be seen that in the sleeve or in the cup-shaped End portion housed a sleeve-shaped insulator 51 along which is transverse to the axial direction of the housing 43 - as in the previous embodiments discussed - the adjustment element 61 axially adjusted can be. The axial movement of the adjustment element 61 is about an in the embodiment shown nozzle-shaped transmission element 81 accomplished, which is axially fixed with the balancing element 61 is connected and together with this towards the sleeve or cup-shaped end section 51 is adjustable.

As can be seen from the illustration according to FIGS. 8 and 9 is adjustable in the direction of arrow 71 Actuator 55 "on the inside of a front and rear Side wall section 56 a link guide 83 in the form introduced a guide groove 83 'in which a transverse the above guide pin 85 engages on the Transmission member 81 is formed or attached thereto.

An adjustment movement of the cuboid actuator 55 ' in the axial direction 71, ie in the axial longitudinal direction of the Housing 43 forcibly causes an adjustment movement perpendicular to it, namely in setting direction 87. Because the Guide pin 85 held over the transmission member 81 can an axial longitudinal adjustment direction corresponding to the Arrow display 71 does not understand and is by the corresponding adjustment movement of the actuator 55 of the held according to the respective position of the guide groove 83 ', whereby the transmission element 81 and thus also the balancing element 61 forcibly the desired adjustment movement executes in the direction of arrow 87. The Transmission member 81 is therefore guided in a sleeve 89.

Deviating from the embodiment shown, the Link guide 83 or the guide groove 83 'linear his. This results in a linear translation. The degree of translation depends on the pitch and can, for example, be on the order of approximately 1: 2 lie. The link guide or the guide groove can but also be curved, as in the embodiment is reproduced according to FIGS. 8 and 9, whereby a corresponding axial adjustment movement in Arrow direction 71 to a differently strong immersion movement or return movement of the adjustment element 61 in the cave or in the pot-shaped end section 51 is translated.

According to the gear ratio and the capacitor effect then the mentioned scale 79 has to be formed, in order to be able to clearly see which division of benefits is set.

Claims (23)

1. Circuit for splitting or for joining radio-frequency powers, having the following features

   having a main path (7) which is connected between an input port (1) and a first output port (3),

   having a branch line (11) which branches off from the main path (7) at a branching point (9) and leads to a second output port (5),

   having a spur line (37) which is coupled to the branch line (11), and

   having a compensating element (61) for splitting or joining radio-frequency powers together in different ways,

   the spur line (37) is connected via a capacitor (C₃) to the inner conductor (13') of the main path (7) and via a capacitor (C₂) to the inner conductor (15'), which leads to the second output port (5), of the branch line (11),

   the capacitance of the at least two capacitors (C₂, C₃) can be varied,

   the capacitances of the at least two capacitors (C₂, C₃) can be varied by means of the compensating element (61) which is adjustable or can be preselected differently, and/or can be installed or removed, characterized in that

   the electrical length of the spur line (37) can be varied by means of the compensating element (61) such that the change in the magnitude of the power which is tapped off or is supplied also makes it possible to compensate for the resistance change caused by the change in the way in which the power is split or joined together.
2. Circuit according to Claim 1, characterized in that, in order to compensate for the resistance change as a function of the power which is tapped off, a compensating element (61) is provided which, in particular, can be adjusted or can be preselected differently and/or can be fitted or removed, and which is preferably a part of at least one capacitor (C₂, C₃) which is connected to a branch line (11), or is coupled to such a part.
3. Circuit according to Claim 2, characterized in that the compensating element (61) is designed such that, when the proportion of the power which is tapped off is changed, the electrical length of the spur line (37) which is coupled to the branch line (11) is changed at the same time in order to compensate for the resistance change which is associated with this.
4. Circuit according to Claims 1 to 3, characterized in that the capacitances of the at least two variable capacitors (C₂, C₃) can be varied by varying a common control element or compensating element (61).
5. Circuit according to one of Claims 1 to 4, characterized in that at least two series-connected capacitors (C₃, C₂) are provided in the branch line (11), whose capacitances can be varied by varying the axial position of the compensating element (61).
6. Circuit according to one of Claims 1 to 5, characterized in that the inner conductor (13') of the main line (7) has a section (45) which is provided with a transverse hole (47), axially offset with respect to which, and DC-isolated from it, a further body is provided which is in the form of a sleeve and is part of the inner conductor (15') of the branch line (5), in which case the compensating element (61) which passes through the two bodies (45, 51) in the form of sleeves can be varied by varying the capacitance of the capacitors (C₂, C₃, C₁).
7. Circuit according to one of Claims 1 to 6, characterized in that the compensating element (61) is electrically conductive.
8. Circuit according to one of Claims 1 to 7, characterized in that the compensating element (61) is electrically non-conductive.
9. Circuit according to Claim 7 or 8, characterized in that the compensating element (61) is isolated from the bodies (45, 51) in the form of sleeves, producing a separating gap, and/or is DC-isolated by using an insulator which is provided on the compensating element (61) and/or on the inside of the bodies (45, 51) which are in the form of sleeves, and is preferably composed of plastic.
10. Circuit according to one of Claims 1 to 9, characterized in that the end axial separation between the two bodies (45, 51) which are in the form of sleeves is constant, can be preselected or can be varied.
11. Circuit according to one of Claims 1 to 10, characterized in that the compensating element (61) is connected to an adjusting body, which is provided in an axial extension of the branch line (11), on the opposite side from the main line (7).
12. Circuit according to one of Claims 1 to 11, characterized in that the compensating element (61) is connected to a spindle drive, via which it can be moved axially.
13. Circuit according to one of Claims 1 to 12, characterized in that the spindle drive is arranged on the housing (43) of the coaxial main line (7), on the opposite side to the branch line (15).
14. Circuit according to one of Claims 1 to 11, characterized in that the compensating element (61) can be moved by means of a linearly movable control element (55, 55'').
15. Circuit according to Claim 14, characterized in that the compensating element (61) can be moved transversely, that is to say in particular with an adjustment direction (87) which runs at right angles to the movement direction (71) of the control element (55, 55").
16. Circuit according to Claim 14 or 15, characterized in that the control element (55') has a slotted and/or guide groove (83, 83') which interacts with a guide device, which interacts with it, or with a guide pin (85), such that a linear adjustment movement of the control element (55') is converted to a linear adjustment movement of the compensating element (61).
17. Circuit according to Claim 16, characterized in that the guide device is, in particular, in the form of a guide pin (85) on a transmission element (81), which is connected to the compensating element (61) and can be moved together with it.
18. Circuit according to Claim 16 or 17, characterized in that the transmission element (81) is in the form of a connecting stub, and is preferably guided, and can be moved axially, in a guide device (89) which is in the form of a sleeve.
19. Circuit according to one of Claims 1 to 18, characterized in that the step-up ratio between the control element (55, 55'') and the adjustment movement of the compensating element (61) is designed such that they are proportional to one another.
20. Circuit according to one of Claims 1 to 19, characterized in that the adjustment movement of the control element (55, 55'') is not proportional to the axial adjustment movement of the compensating element (61).
21. Circuit according to Claim 20, characterized in that the slotted guide (83) or the guide groove (83') is designed to be linear.
22. Circuit according to Claim 21, characterized in that the slotted guide (83) or the guide groove (83') is designed to be curved.
23. Circuit according to one of Claims 1 to 22, characterized in that the control element (55) is designed with a scale (79) or an adjustment and reading device (77), which is provided with an adjustment or reading device (77) formed directly or indirectly on the housing (43), or with a scale (79), which is formed there, for reading the power split at the two output ports (3, 5).

Images