EP1998402A1 - Feed system, in particular for receiving television or radio programming transmitted by satellite - Google Patents

Abstract

The feed system (1) has a waveguide (7) and a converter, which is placed in a converter housing. The waveguide and the housing of the converter are formed as one-piece Housing. The integral housing (3) has a chamber, in which a printed circuit board of the converter is placed. The two uncoupling pins are aligned perpendicularly to each other. A coupling pin is arranged in an angular manner and lies parallel to the level of the printed circuit board.

Description

The invention relates to a feed system according to the preamble of claim 1.

Feed systems are commonly used to receive televisions and radio programs broadcast via geostationary-positioned satellites. In this case, analog or digitally broadcast programs can be received in such feed systems.

Such feed systems include a so-called OMT, so called a so-called orthomode transducer (called in German Orthormenkoppler or polarization switch), the receiving side a horn, for example, a so-called grooved horn, which is usually at least slightly conical and compared to its opening area in a round in cross-section or, for example, square waveguide passes.

Coupling pins are provided in the waveguide, namely a first coupling pin for receiving an electromagnetic wave radiated in a first plane of polarization and a further, offset thereto lying second coupling pin for receiving an electromagnetic wave which propagates in a plane perpendicular to the first plane of polarization second polarization plane. About this coupling pins, the electromagnetic wave of the first and second polarization plane can be coupled and fed to a downstream converter (LNB), in which a corresponding processing for frequency conversion of the satellite received signals. As a rule, the LNB again comprises a separate housing, ie a housing which is separate from the feed system and which is mounted laterally or transversely to the waveguide of the OMT.

Corresponding constructions are for example from EP 0 611 488 or the EP 0 815 611 B1 known.

The known from these Vorveröffentlichungen coupling pins are arranged parallel to each other. Between you is a lying in the same plane of the coupling pins reflector pin provided. At the end of the short-circuited waveguide, a phase rotator is provided which rotates and reflects a plane of polarization left through 90 °, which is why the closer to the waveguide end coupling pin can be arranged lying in the same plane as the remote coupling pin for receiving the first polarization plane. Therefore, the board of the converter, which is housed in a box-shaped housing, be laterally arranged on the waveguide of the OMT, so that the coupling pins perpendicular to the Leiterplatinenebene project through the housing of the LNB and through corresponding openings in the waveguide protrude from the OMT. Therefore, the corresponding construction of the lateral attachment, so the eccentric attachment of the LNB's side to the median plane of the waveguide is due.

Constructions have also become known in which the waveguide attached laterally to the housing of the LNB is integrally formed with the corresponding housing plate of the LNB. Nevertheless, the unitary housing construction basically has the same construction, such that the waveguide of the OMT is offset laterally relative to the housing receptacle connected in one piece therewith.

Through this overall arrangement results in a comparatively broad overall structure, which is due to the diameter of the grooved horn, which typically has a diameter size of 55 mm and more. Due to the lateral positioning of the housing of the LNB in relation to the central axis of the waveguide, a further broadening of the entire feed arrangement may result. Known feed systems therefore have a total housing width of about 60 mm to 70 mm and more.

In addition, a feed system has already become known with an OMT which provides a smaller diameter dielectric horn instead of a conventional horn or grooved horn. However, this causes a slight deterioration of the reception level of the reception signals. Nevertheless, the overall structure is still comparatively large due to the lateral attachment to the housing of the LNB.

If such feed systems are to be used for multifeed reception, this requires parabolic mirrors or so-called offset mirrors with a minimum diameter of 80 cm.

Therefore, it has also been tried to develop a so-called twin horn, which is constructed so that the distance between the central axes of the two waveguides are less than 55 mm to each other. However, this requires special designs, especially a special tool, if such a twin horn is to be produced as a casting.

A multi antenna with several parallel arranged horn constructions and waveguides is also from the DE 20 2005 012 610 known. However, this prior publication describes only a very specific arrangement with very specific lateral center distances between the individual OMT's, which are only suitable for a specific multifeed reception for certain satellites geo-stationary positioned orbit. In principle, the predetermined axial distance is only optimal with respect to a particular position on the earth, at another point nearer or farther away from the equator, the construction given here due to the lack of adaptation of the side distance of the individual waveguide leads to a deterioration of the received signal.

In contrast, it is an object of the present invention to provide an improved feed system, which allows a multifeed reception even with smaller parabolic mirrors, in particular offset mirrors.

The object is achieved according to the features specified in claim 1. Advantageous embodiments of the invention are specified in the subclaims.

In the context of the present invention, a feed system with an associated horn, in particular grooved horn, and an OMT is proposed, which builds considerably narrower compared to conventional devices with very good reception performance. The overall width of the device housing, including the horn and the housing of the LNB's may have a width, for example, is less than 45 mm. This makes this feed system suitable for multifeed, for example for receiving programs transmitted via the Astra satellite (19.2 ° East) and the Hotbird satellite (13 ° East), using a mirror diameter (parabolic antenna) of only 60 cm. In comparable feed systems of the prior art - which build significantly wider - this was only possible if larger mirrors are used (for example, at least 80 cm), since in this case the centers of the feed systems (the horn and the waveguide) in the larger lateral Distance from each other. In contrast, within the scope of the invention even a fourfold multifeed reception can be carried out with a satellite antenna with a diameter of only 60 cm, for example programs of the satellites Hotbird (13 ° East), Astra (19.2 ° East), Astra (23.5 ° East) and Astra (28.2 ° East).

In a preferred embodiment of the invention, the housing of the converter, including the housing of the horn and the waveguide as a common casting produced. In this case, a structure can be realized, which allows a necessary demoulding. Only a separate housing cover is necessary to close the converter housing. This housing cover can be made as a casting or as a separate sheet metal part or in another suitable manner.

As low proves further that in a preferred embodiment, two signal output pins can be designed as PCB pins. That is, in the waveguide tube of the waveguide only two openings are provided which form a connection to the housing interior of the LNB with the printed circuit board provided there, the at least two Signalauskoppelstifte, preferably in the form of two Leiterplatinenzapfen project through this opening into the interior of the waveguide.

In an alternative embodiment, it is possible that the two mutually parallel Auskoppelstifte are arranged transversely and in particular perpendicular to the printed circuit board, that can be guided laterally through corresponding openings in the waveguide. Finally, it is also possible in a third variant that the two Auskoppelstifte are aligned perpendicular to each other, while for example at least one of Auskoppelstifte is designed as an angle pin, so that the actual, projecting into the waveguide Auskoppelabschnitt is perpendicular to the other leg of the angularly shaped coupling pin What this angle-shaped decoupling pin is then ultimately held on the circuit board. Also in this case, corresponding recesses in the wall of the waveguide can be introduced so that the printed circuit board is positioned in a tight position for this purpose can be so that the housing of the waveguide and the converter are arranged as symmetrical and central to each other, so if possible with no or only slightest lateral offset to allow a total of narrow housing construction.

Figur 1:

eine schematische perspektivische Ansicht eines ersten Ausführungsbeispiels der Erfindung;

Figur 2:

eine frontseitige Ansicht auf das Ausführungsbeispiel nach Figur 1;

Figur 3:

eine Draufsicht auf das Ausführungsbeispiel nach Figur 1 und 2;

Figur 4:

eine abgewandelte perspektivische Ansicht eines weiteren Ausführungsbeispiels;

Figur 5:

eine Frontansicht auf das Ausführungsbeispiel gemäß Figur 4;

Figur 6:

eine Draufsicht auf das Ausführungsbeispiel gemäß Figur 4 und 5;

Figur 7:

eine Frontansicht eines nochmals abgewandelten Ausführungsbeispiels mit außermittig angebrachtem Hohlleiter im Verhältnis zum Gehäuse des Konverters;

Figur 8:

ein im weiteren Detail gezeigtes Ausführungsbeispiel der Erfindung mit zwei parallelen Auskoppelstiften für zwei Polarisationen, die als verlängerte Zapfen einer Gesamtleiterplatte ausgebildet sind;

Figur 9:

eine entsprechende Darstellung zu Figur 8 ohne eingesetzte Leiterplatine;

Figur 10:

ein abgewandeltes Ausführungsbeispiel, bei welchem zwei parallele Auskoppelstifte senkrecht zur Leiterplatine angeordnet sind und durch zwei Öffnungen in den Hohlleiter ragen;

Figur 11:

eine um 90° gedrehte Querschnittsdarstellung gegenüber Figur 10 (senkrecht zur Leiterplatine) zur Verdeutlichung der Lage der Auskoppelstifte;

Figur 12:

ein abgewandeltes Ausführungsbeispiel in Querschnittsdarstellung, bei welchem die Auskoppelstifte senkrecht zueinander stehen; und

Figur 13:

eine schematische dreidimensionale Darstellung des Hohlleiters mit Horn und den darin eingearbeiteten Öffnungen, über die auf einer Leiterplatine sitzende Auskoppelstifte einführbar sind.

The invention will be explained in more detail below with reference to exemplary embodiments in which:

FIG. 1:

a schematic perspective view of a first embodiment of the invention;

FIG. 2:

a front view of the embodiment according to FIG. 1 ;

FIG. 3:

a plan view of the embodiment according to FIG. 1 and 2 ;

FIG. 4:

a modified perspective view of another embodiment;

FIG. 5:

a front view of the embodiment according to FIG. 4 ;

FIG. 6:

a plan view of the embodiment according to FIG. 4 and 5 ;

FIG. 7:

a front view of a further modified embodiment with eccentrically mounted waveguide in relation to the housing of the converter;

FIG. 8:

an embodiment of the invention shown in further detail with two parallel Auskoppelstiften for two polarizations, which are formed as elongated pins of a Gesamtleiterplatte;

FIG. 9:

a corresponding representation too FIG. 8 without inserted printed circuit board;

FIG. 10:

a modified embodiment in which two parallel Auskoppelstifte are arranged perpendicular to the printed circuit board and protrude through two openings in the waveguide;

FIG. 11:

a 90 ° rotated cross-sectional view opposite FIG. 10 (perpendicular to the printed circuit board) to clarify the position of the Auskoppelstifte;

FIG. 12:

a modified embodiment in cross-sectional view, in which the Auskoppelstifte are perpendicular to each other; and

FIG. 13:

a schematic three-dimensional representation of the waveguide with horn and the openings incorporated therein, over which seated on a printed circuit board Auskoppelstifte be inserted.

In FIG. 1 is a first embodiment of the invention for a feed system 1 for receiving television and / or Radio programs broadcast over a geostationary satellite.

The feed system 1 has an overall housing 3, which consists at least predominantly of a cast part.

For this purpose, the feed system 1 comprises a horn 5, which merges via a funnel-shaped tapering section into a waveguide 7, which is closed at one end opposite the horn 5 with a waveguide wall 9.

This OMT (Orthomode Transducer) with the horn 5 and with the waveguide 7 and with the waveguide end wall at the end of the waveguide 7 is preferably made as a casting. As a result, the waveguide 7 will at least slightly taper from the cavity 5 to its waveguide end 9 in order to be able to perform demolding.

The horn 5 is formed in the embodiment shown as a so-called groove horn 5 ', i. it comprises in the illustrated embodiment, three concentric grooves 5 ", which are arranged to form annular grooves 11, in such a way that from the outside inwards extending each concentric inner groove is offset in the direction of the subsequent waveguide 7. Thus leave prevent unwanted wall currents to avoid cross-polarization couplings.

The housing tube of the waveguide 7 and the horn 5 are preferably part of the overall housing 9, which can be closed, for example, along a sectional plane 13 by means of a housing cover 3 '. The cutting plane 13 is in shown embodiment, based on the width B of the housing arranged eccentrically.

In FIG. 2 is a schematic front view and in FIG. 3 a schematic plan view of the embodiment according to FIG. 1 shown. It can be seen that the maximum width BH of the horn in the illustrated embodiment corresponds approximately to the width B of the converter housing 12. In the embodiment shown, the central axis 7 'of the waveguide 7 and the horn 5 is arranged so that this central axis 7' is located in the median plane 15, which is central and parallel to the large opposite side walls 12a and 12b of the converter housing 12, wherein the converter housing 12th , as stated, is part of the overall housing 3 and in the process the one large side wall 12b is essentially formed by the cover 3 '.

In the embodiment according to the FIGS. 4 to 6 a modification is shown insofar as the waveguide 7 quasi not positioned on the upper longitudinal or front side 12c and formed with the converter housing 12 as an integral overall housing, but quasi exits on the front side 12d of the converter housing 12 and in the forward projecting horn 5 passes. In the embodiment of the FIGS. 4 to 6 Thus, the waveguide 7, as it were, is no longer directly recognizable from its contour towards the outside in the overall box-shaped converter housing 12, which thus simultaneously represents the overall housing. But even in this embodiment, the arrangement is such that the central axis 7 'of the waveguide 7 and the horn 5 is located in the center plane 15, which is parallel and central to the side walls 12 a.

Based on FIG. 7 is schematically shown that in deviation from the preceding embodiments, the central axis 7 'of the waveguide 7 and the horn 5 can be arranged to the center plane 15 through the converter housing 12 with a small lateral offset S. However, this lateral offset S should be so small that, starting from a predetermined horn 5 and in particular groove horn 5 'optimized for the reception of electromagnetic waves, the overall width B of the overall housing 3 should not or substantially not increase, ie preferably 45 mm and less For example, below 40 mm, for example, by 39 mm or even less should have. Based on FIG. 7 it is further shown that the central axis 7 'of the waveguide does not necessarily have to lie in the middle plane 15 parallel to the large side surfaces 12a of the converter housing. However, these deviations are preferably less than 20%, in particular less than 10%, or even less than 5% of the maximum outer diameter of the horn 5.

Based on FIG. 8 is now in schematic cross-sectional representation and in FIG. 9 in longitudinal section along the median plane 15, a first embodiment in a schematic detail view reproduced.

It can be seen that approximately centrally, ie at the level of the median plane 15, a printed circuit board 19 is disposed in the chamber 20, that is, in the chamber 20, which is formed by the converter housing 12. The printed circuit board 19 preferably accommodates the entire circuit arrangement for the converter circuit (LNB).

At the waveguide 7 facing edge 19 'of Printed circuit board 19 are at a distance two Auskoppelstifte 22 and 23 axially over, which protrude through corresponding holes 24 and 25 in the interior of the waveguide 7. In other words, therefore, the Auskoppelstifte 22 and 23 in the plane of the printed circuit board 19, ie in the illustrated embodiment, also in the center plane 15 or at least parallel thereto and come in the middle, ie to lie radially in the waveguide.

As can be seen in particular FIG. 9 shows, in the axial longitudinal direction of the waveguide 7 between the two freely projecting Auskoppelstiften 22 and 23 in the same plane as the coupling pins 22, 23, a reflector 27 in the form of a reflector pin 27 'is arranged. By this arrangement, not only the waveguide and the horn can be arranged symmetrically and centrally to the converter housing 17, but also the printed circuit board in the middle in the converter housing, so that the Auskoppelstifte 22 and 23 also in the middle of extension of Leiterplatinenebene on the mentioned holes 24, 25 in the Inside of the waveguide protrude.

At the end of the waveguide, a phase rotator 31 is still provided, which reflects the second plane of polarization in the reflection at the waveguide end 9, ie on the waveguide wall 9, by 90 °, so that these perpendicular to the first plane of polarization electromagnetic wave on the waveguide end closer second coupling pin 23 can be coupled out. The aforementioned reflector 27 serves to ensure that the first polarization decoupled from the first decoupling pin can not run beyond the reflector to the reflector end, but only the polarization plane perpendicular to the first coupling pin is allowed to pass therethrough.

The distance between the first decoupling pin 22 and the reflector 27 and between the reflector 27 and the second decoupling pin 23 is usually λ / 4, where λ represents the operating wavelength with respect to the frequency spectrum to be received, preferably the average operating wavelength.

With regard to the mode of operation and construction of such a waveguide with decoupling means, for example, the Vorveröffentlichungen already mentioned in the introduction EP 0 611 488 B1 as well as the EP 0 815 611 B1 directed.

In the embodiment according to FIGS. 10 and 11 is the printed circuit board 19 arranged in immediately adjacent position below the housing cover 3 '. The corresponding electrical components and components are located on the housing cover 3 'facing away from the interior 20 of the converter housing 12th

Also in this case, two mutually parallel coupling pins 22 and 23 are provided, which are aligned in this embodiment but now perpendicular to the plane of the printed circuit board 19. The printed circuit board covers the waveguide 7, wherein in the next to the printed circuit board 19 lying and thus the circuit board next coming point in the wall material of the waveguide 7 two corresponding bores 24 and 25 are provided through which the two mentioned Auskoppelstifte 22 and 23 in the interior of the waveguide 7 protrude. The structure with the aforementioned reflector 27 and the phase rotator 31 at the end of the waveguide adjacent to the waveguide end 9 is similar to the previous embodiment. In this embodiment, the Arrangement such that the circular front horn in a circular cross-section square waveguide 7, whereby the waveguide outer dimensions in the circuit board can be further reduced. This allows the printed circuit board 19 immediately adjacent to provide the parallel wall of the square or rectangular waveguide in cross section, so that the total width of the overall housing 3, ie the actual converter housing 12 and the maximum outer dimension of the horn 5 again in the desired ranges of preferably less than 50 mm or even 45 mm and less.

Also in this embodiment, it is possible to provide a total of compact overall housing 3, especially if, as mentioned, as a waveguide 9 is not a circular waveguide, but a square in cross section waveguide is used. Because the edge length of the approximately square in cross-section waveguide 7 is much smaller than the diameter of the top view in round groove horn 5 ', so that in this case in addition to the in this case preferably straight side wall 7' of the waveguide 7 and the adjacent housing cover 3 'of the overall housing 3 enough space for the accommodation of the printed circuit board 19 remains.

Finally, a further embodiment according to the FIGS. 12 and 13 Reference is made, in which the two coupling pins are perpendicular to each other.

The arrangement for this embodiment is such that a coupling pin is perpendicular to the Leiterplatinenebene and from a side 7 'of preferably in cross section square waveguide 7 is guided by a hole 24 provided there radially or vertically into the interior of the waveguide 7. During the positioning of the printed circuit board 19 along the arrow 119 so the parallel to the printed circuit board 19 at a distance extending Auskoppelstift 23 is guided through the bore 24 into the interior of the waveguide 7. The decoupling pin 23 is angular overall and has a support portion 23 ', which is arranged perpendicular to the actual decoupling pin 23 and the decoupling pin 23 so holds on the circuit board 19 and it connects to it electrically.

The decoupling pin 23 is preferably positioned in the hollow conductor during insertion through the bore 24 in a central plane.

Furthermore, in the transition region to the adjacent wall 7 "an angular slot 107 is incorporated or already provided during the casting process, which allows that during the position movement along the arrow 119 of the printed circuit board of standing perpendicular to the circuit board level further decoupling pin 22 through this slot in the In other words, the printed circuit board 19 extends directly adjacent to the bottom wall 27 'of the waveguide, which is also flat in this embodiment, as a square in cross-section or Basically, however, this embodiment is also possible, as in the previous exemplary embodiment, when using a waveguide which is circular in cross-section.

In this embodiment, otherwise the structure is comparable to the previous examples, ie at first the first Auskoppelstift 22 and offset to the second Auskoppelstift 24 is arranged at an axial distance, in which case no reflector between the two Auskoppelstiften must be arranged, since both Auskoppelstifte according to the two perpendicular aligned polarizations perpendicular to each other. Likewise, no 90 ° phase rotator is provided on the waveguide 9 in this embodiment.

In the described structure, in particular, the converter housing 12 may be formed slightly conically diverging in its side walls, so that a trouble-free removal is possible. As already mentioned, the waveguide 7 is also slightly tapered towards its waveguide end in order to allow a corresponding removal from the mold.

Thus, a one-piece cast housing of a feed arrangement with marginal OMT can be realized in a highly compact design.

As is apparent from the description, therefore, the maximum outer diameter of the waveguide 7 or especially the maximum outer diameter of the horn 5 and in particular of the groove horn 5 'on a measure, which preferably corresponds to the thickness of the converter housing 12 or thus the thickness of the overall housing 3 , ie when viewed perpendicular to the center plane 15, which runs parallel to the larger side surfaces or parallel to the orientation of the lid 3 '. In particular, when several such feed systems arranged very close together and therefore the horn should have lateral flats in a plane perpendicular to the center plane, the dimensioning is preferably such that the diameter of the waveguide 7 and in particular the horn 5 is perpendicular to the center plane of the thickness of the housing 12 and the overall housing 3 or this Thickness of the overall housing less than 120% and in particular less than 115% or 110% of the corresponding thickness of the horn or the waveguide transverse to the center plane. Thus, for example, the grooved horn without surrounding housing have a diameter of, for example, 40 mm and less, for example 39 mm. With surround (radome), the grooved horn can have a diameter of almost 45 mm. This width preferably corresponds to the width of the feed system housing. That is, the width of the feed system housing in this case corresponds to almost 150% of the Wellenhorn diameter.

Finally, it is also noted that, for example, with respect to the waveguide cross-sections in question for the corresponding frequency range used, e.g. when using a square waveguide (ie with a square diameter) an inner edge length of about 15 mm and when using a circular cross-section waveguide an inner diameter of about 17.5 mm results. This means that when using a waveguide with a square cross-section again a space of 2.5 mm can be saved. These dimensions can be achieved in particular if, for example, the feed system is provided or designed to receive a frequency range from 10.7 GHz to 12.75 GHz. Similar conditions, however, also arise in other frequency ranges.

Claims (8)

Speeding system, in particular for the reception of satellite and / or television broadcast programs, having the following features: with a waveguide (7), - The waveguide (7) is on the input side with a horn (5), preferably a groove horn (5 ') equipped, - With a converter (LNB), which is housed in a converter housing (12), - The waveguide (7) and the housing (12) of the converter (LNB) are substantially formed as a one-piece housing (3), wherein the overall housing comprises a chamber (20) in which a printed circuit board (19) of the converter (LNB) is housed, - In the interior of the waveguide (7) protrude two Auskoppelstifte (22, 23), via which electromagnetic waves can be received, which are emitted by the satellite in two perpendicular polarization planes, - The Auskoppelstifte (22, 23) protrude through recesses (24, 25) in the material of the waveguide and are mechanically and electrically connected to the in the chamber (20) of the converter housing (12) provided printed circuit board (19), characterized by the following further features - The waveguide (7) with respect to the converter housing (12) arranged so that the central axis (7 ') of the waveguide (7) in a central plane (15) with respect to the overall housing (3) or the converter housing (12) or to a Lateral offset (S) which is less than 20% with respect to the maximum outer diameter of the horn (5), the thickness of the converter housing (12) perpendicular to the center plane passing through the converter housing (12) is less than 120% or 110% and preferably 100% of the maximum diameter of the waveguide or the maximum outer diameter of the horn (5) perpendicular to the center plane, - the arrangement is such, a) that the two Auskoppelstifte (22, 23) are arranged parallel to each other, in parallel to the printed circuit board (19) or in the plane of the printed circuit board (19) and thereby by two recesses (24, 25) in the interior of the waveguide ( 7) protrude, or b) that the two Auskoppelstifte (22, 23) are arranged parallel to each other and are aligned transversely or preferably perpendicular to the plane of the printed circuit board (19) and thereby protrude through two recesses (24, 25) in the interior of the waveguide (7) lead transversely to the printed circuit board (19) in the interior of the converter housing (12), or c) that the two Auskoppelstifte (22, 23) are aligned perpendicular to each other, wherein a coupling pin is configured at an angle and parallel to the plane of the printed circuit board (19) and thereby by a perpendicular to the Auskoppelstift (23) extending angle portion (23 ') to the printed circuit board (19) and is electrically connected thereto, and that in the wall portion of the waveguide (7) has a transverse to the wall portion extending recess (24) and extending in a partial circumferential area slot-shaped recess (107) is, about which the Auskoppelstifte (22, 23) during the positioning movement (119) of the printed circuit board (19) into the interior of the waveguide (7) can be brought hineinragend. Feed system according to Claim 1, characterized in that the converter housing (12) which forms part of the overall housing (3) has slightly tapered wall sections (12a, 12b, 12c, 12d) for removal from the mold and along an interface (13) by means of a lid (13). 3 ') is closable. Feed system according to claim 1 or 2, characterized in that the width of the converter housing (12) and the maximum width of the horn (5) are equal or differ by less than 10% and preferably less than 5%. Feed system according to one of claims 1 to 3, characterized in that the cross section of the waveguide (7) and the cross section of the converter housing (12) are arranged symmetrically to one another. Feed system according to one of claims 1 to 3, characterized in that the cross section of the waveguide (7) is n-polygonal, preferably rectangular or square. Feed system according to one of claims 1 to 5, characterized in that the Auskoppelstifte (22, 23) as in the plane of the printed circuit board (19) extending lugs or extensions are formed with conductive portions thereon. Feed system according to one of claims 1 to 6, characterized in that the Auskoppelstifte (22, 23) are arranged parallel to each other, and in this case between the two Auskoppelstiften (22, 23) a preferably pin-shaped reflector (27) is provided, wherein the Distance between the reflector (27) and the respective decoupling pin (22, 23) is at least about λ / 4, where λ represents a wavelength of the frequency spectrum to be transmitted. Feed system according to one of claims 1 to 7, characterized in that when both Auskoppelstifte (22, 23) are arranged parallel to each other, at the end of the waveguide (7) is provided a rotation means (31) for rotating the reflected plane of polarization by 90 °.

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