WO2018197375A1 - Antenna assembly having adaptable phase relationship for adjusting the emission characteristic - Google Patents

Abstract

The invention relates to an antenna assembly (6) for a radar front end (60), comprising high-frequency antennas (4) for converting electromagnetic energy and a supply line network (1), by means of which the high-frequency antennas (4) can be connected to a transmitting unit and/or a receiving unit (61), the high-frequency antennas (4) and the supply line network (1) being formed by conducting tracks of a printed circuit board (68), and the supply line network (1) having a first supply line (2) in a first spatial direction (z) and at least two second supply lines (3) in a second spatial direction (y), the second supply lines (3) being connected to respective connection points (22) of the first supply line (2) and the high-frequency antennas (4) being connected to respective connection points (32) of the second supply lines (3). In order to make an emission characteristic of the radar front end (60) particularly easily adaptable to a particular intended use, according to the invention, the first supply line (2) and the second supply lines (3) are shaped as a loop (20, 30) between two adjacent connection points (22, 32) and a length (50, 52) of the supply line (2, 3) in question between the two adjacent connection points (22, 32) can be defined by means of the shape of the loop (20, 30) while the position of the high-frequency antennas (4) is held constant.

Description

 Antenna arrangement with adaptable phase relationship for adjusting the

 radiation

The invention relates to an antenna arrangement for a radar sensor, wherein

Radio frequency antennas and a feeder network for connecting the

Radio frequency antennas are formed by printed conductors of a printed circuit board. Another aspect of the invention relates to a radar sensor having such an antenna arrangement. Further aspects of the invention relate to a driver assistance device having the aforementioned radar sensor and a motor vehicle having the same

Driver assistance device. A fifth aspect of the invention relates to a method of manufacturing an antenna assembly.

Radar sensors for use in a motor vehicle are known from the prior art. The radar sensor may be included by a driver assistance system, for example a distance control system, an automatic emergency braking system and / or for automating a drive of the motor vehicle. Spatial dimensions of the radar sensor are predetermined in particular by the spatial dimensions of a radar front end. A radar front-end may be an arrangement consisting of radio-frequency antennas for the transmission direction and reception direction and an electronic transmission and reception unit. A typical one

Frequency range for the radar sensor is 77 GHz or 79 GHz.

For the mentioned frequency range, it is customary to provide the radar sensor or one or more radio-frequency antennas by means of a printed circuit board or printed circuit board made of a polymer-based substrate. By dielectric properties of the circuit board or the substrate and the resulting wavelength of an electromagnetic wave in the respective

Frequency range, the dimensions for the radar front end are given.

In this context, DE 10 2010 064 348 A1, for example, provides a radar sensor for motor vehicles, wherein an antenna arrangement of the radar sensor has at least two groups of antenna elements which differ in their effective direction in elevation. A control device is designed to activate and deactivate the two groups in a periodic change and a

Evaluation device is designed to use an elevation angle of an object a contrast between those received by the different groups

Estimate radar echoes.

It is an object of the present invention to provide a radiation characteristic of a

Radar sensor for a motor vehicle particularly easy to customize to a particular purpose.

This object is achieved by the subject matters of the independent claims. Advantageous embodiments with expedient developments are the subject of the dependent claims. Appropriate further training of

Antenna arrangement according to the invention apply analogously to the inventive method for producing an antenna arrangement and vice versa.

An antenna arrangement according to the invention for a radar sensor comprises

Radio frequency antennas for transmitting electromagnetic energy. In particular, the high frequency antennas for transmitting electromagnetic energy between a conducted electromagnetic wave and a

formed electromagnetic free space wave. The transfer of

Electromagnetic energy may include radiating and / or receiving electromagnetic energy. The antenna arrangement further comprises a supply network, by means of which the high-frequency antennas can be connected to a transmitting unit and / or a receiving unit. In particular, that can

Feed line network to be formed, the line-connected electromagnetic wave between the high-frequency antennas and the transmitting unit and / or the

Receiving unit to transmit. The high-frequency antennas and the supply network are formed by printed conductors of a printed circuit board. Preferably, the

Radio frequency antennas and / or the supply network by stripline

(Microstrip), shielded strip lines (stripline) and / or formed by contacts (vias) of the circuit board. The printed circuit board may comprise an insulating dielectric.

The supply network has a first supply line in a first spatial direction and at least two second supply lines in a second spatial direction. In each case one of the second supply lines is connected to a plurality of terminals of the first supply line. At several terminals of the second supply lines is one of the

High frequency antennas connected. In other words, the first lead can contact the at least two second leads with each other while the at least two second leads contact the high-frequency antennas. Preferably, the at least two second leads are arranged in a cell shape. The first supply line can be arranged in a column shape and contact lines formed by the at least two second supply lines. Preferably, the

Radio frequency antennas arranged in rows and / or columns.

In order to design a radiation characteristic of the radar sensor particularly easily adaptable to a particular application, the invention provides that the first lead and the second leads between two adjacent of the plurality of terminals are each formed in a loop and a respective length of the affected feed line between the two adjacent to the plurality of terminals at a constant position of the high-frequency antennas can be predetermined by a respective shape of the loop. The emission characteristic of the antenna arrangement may be determined by the respective length between the two adjacent ones of the plurality of terminals at the first

Lead and / or the second leads are each predetermined. In particular, by the respective length between the two adjacent ones of the plurality of terminals, a phase relationship of the conducted electromagnetic wave between the two adjacent ones of the plurality of terminals can be predetermined. In particular, one is

Phase relationship between two high-frequency antennas, which are each connected to one of the two adjacent of the plurality of terminals, by the respective length of the respective affected feed line between the two adjacent of the plurality

Connections can be specified. In particular, a phase relationship between two of the second supply lines, which are connected to two adjacent ones of the plurality of terminals of the first supply line, can be predetermined by the respective length of the first supply line between the two adjacent ones of the plurality of connections of the first supply line. The respective length between the two adjacent ones of the plurality of terminals is in any case particularly easily predetermined by the shape of the loop. In particular, the shape of the loop in a preparation of the antenna arrangement or in a preparation of the circuit board can be predetermined. In particular, the emission characteristic can be predetermined at a constant position of the high-frequency antennas. In other words, for adapting the radiation characteristic of the antenna arrangement to a respective one

Purpose only to adjust the shape of the loop needed. Position and / or layout of the radio frequency antennas may be the same for each of the different purposes.

A development of the invention provides that the two adjacent ones of the terminals of the second supply lines and two further adjacent ones of the terminals of the second supply lines are each spaced apart by the same length. Especially All connections of the second supply lines have the same length as a distance to an adjacent connection of the same supply line. In particular, show

High-frequency antennas, which are each connected to two adjacent of the terminals of the second leads, each having the same phase relationship to each other.

A development provides that the printed circuit board is designed as LTCC printed circuit board, wherein a relative permittivity of a dielectric of the printed circuit board is at least 6. LTCC (Low Temperature Co-fired Ceramics) is the abbreviation for

Low temperature co-fired ceramics. This is in particular a substrate on which printed conductors of the printed circuit board can be applied. In particular, the substrate forms the dielectric of the printed circuit board. Due to a relative permittivity of at least 6, in particular at least 7, for example between 7.8 and 8.1, LTCC ceramics may be particularly suitable for the circuit board for the antenna arrangement. Since the wavelength of an electromagnetic wave of constant frequency strongly depends on the relative permittivity of the dielectric, a particularly compact design of the antenna arrangement can be made possible by the design of the printed circuit board as LTCC printed circuit board.

A further development provides that the first supply line and the second supply lines run at least substantially perpendicular to one another. In particular, the second supply lines are arranged at respective terminals of the first supply line at an angle of 90 degrees to the first supply line. In this case, by the

Supply line network to be spanned.

A further development provides that the first supply line and the second supply lines are part of a rake-shaped structure. In particular, a calculation bar or arithmetic bar of the rake-like structure can be formed by the first feed line. The second leads may form tines of the rake-like structure. The rake-shaped structure provides a particularly easily expandable structure of the

Antenna arrangement ready. In particular, by extending the second leads and increasing the number of multiple terminals at each of the second

Supply lines can be arranged a higher number of high-frequency antennas in the second spatial direction. Alternatively or additionally, an extension of the

Antenna arrangement in the first spatial direction be predetermined by the number of second leads. Alternatively or additionally, an extension of the

Antenna arrangement in the first spatial direction given by the length of the first lead and the number of connected to the first lead second leads be. Due to the respective expansions in the spatial directions, the bundling of a radiation of the antenna arrangement into the respective spatial directions can be predetermined separately.

A further embodiment provides that the first supply line has a first side and a second side, wherein on both sides in each case at least two of the plurality of terminals are arranged and a loop between two adjacent of the plurality of terminals on the first side and a loop between two adjacent several terminals on the second side are shaped differently. Thereby, a phase relationship between the two adjacent ones of the plurality of terminals on the first side and a phase relationship between the two adjacent ones of the plurality of terminals on the second side may be different from each other. In other words, two adjacent ones of the plurality of ports on the first side and two adjacent ones of the plurality of ports on the second side may each be one

be different in length from each other. As a result, respective phase relationships between two adjacent ports on the first page and the second page may differ.

A further development provides that the first supply line between the first side and the second side has a connection for connecting to the transmitting unit and / or the receiving unit. In this case can differ by the

Phase relationships between two adjacent terminals on the first side and on the second side of a particularly advantageous radiation characteristic may be possible. In particular, a particularly directed radiation according to a solid angle is made possible both by radio-frequency antennas arranged indirectly on the first side and indirectly by the second side.

Another aspect of the invention relates to a radar front end having a

Antenna arrangement of the aforementioned type. In addition to the antenna arrangement, the radar front end may additionally comprise the transmitting unit and / or the receiving unit. Preferably, the radar front end is completely disposed on the circuit board. In particular, the transmitting unit and / or the receiving unit can be realized by equipping.

A third aspect of the invention relates to a driver assistance device having a radar front end of the type mentioned above. For example, the driver assistance device additionally comprises, in addition to the radar front end, an evaluation unit for detecting a vehicle Surrounding area based on a signal from the radar frontend. The radar front end and the evaluation unit together form a radar sensor.

Another aspect of the invention relates to a motor vehicle with the above-mentioned driver assistance device. In particular, the radar sensor and / or the

Antenna arrangement on the motor vehicle, in particular in an outdoor area, arranged. A position of the radar sensor and / or the antenna arrangement relative to the motor vehicle can be constant.

A refinement of the motor vehicle provides that the emission characteristic of the antenna arrangement is predetermined in accordance with an elevation angle or in elevation by the length between the two adjacent ones of the plurality of connections on the first supply line. In particular, the antenna arrangement is oriented such that by the phase relationship between two of the adjacent ones of the plurality

Connections on the first supply line the radiation characteristic according to

Elevation angle is specified. In particular, the first supply line is vertical

aligned. The emission characteristic of the antenna arrangement according to the

In this case, elevation angle is particularly easy to predetermine by the shape of the loop between two adjacent ones of the plurality of terminals of the first supply line. The elevation angle indicates, in particular, a vertical angle with respect to a plane on which the motor vehicle stands.

A development of the motor vehicle provides that the emission characteristic of the antenna arrangement according to an azimuth angle or in azimuth by the length between the two adjacent of the plurality of terminals on the second

Supply lines is specified. In particular, the antenna arrangement is oriented such that by the phase relationship between two of the adjacent ones of the plurality

Connections on the second leads the radiation characteristic according to the

Azimuth angle is specified. In particular, the second leads are aligned horizontally. The emission characteristic of the antenna arrangement according to the

Azimuth angle is particularly easy to specify in this case by the shape of the loop between two adjacent of the plurality of terminals of the second leads. In particular, the azimuth angle indicates a horizontal angle with respect to a plane which is parallel to a forward direction of the motor vehicle and perpendicular to the plane on which the motor vehicle stands. A fifth aspect of the invention relates to a method for producing a

Antenna arrangement with several steps. First, fixed positions for high frequency antennas are set on a substrate. At these fixed positions, the radio frequency antennas can be placed on the substrate. The

High-frequency antennas are contacted by means of a supply line network, which has a first supply line in a first spatial direction and at least two second supply lines in a second spatial direction, wherein in each case one of the second supply lines is connected to a plurality of terminals of the first supply line and at each of a plurality of respective terminals of the second supply lines the high-frequency antennas

is connected. In a third step, a radiation characteristic of the

Antenna arrangement can be adjusted by setting a respective length of the first lead and the second lead between each two adjacent of the plurality of terminals. In particular, the first lead and the second lead are each formed between two adjacent ones of the plurality of terminals in a loop. In this case, the radiation characteristic of the antenna array can be adjusted by specifying a shape of the respective loops.

Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures are not only in the respectively indicated combination, but also in others

Combinations usable, without departing from the scope of the invention. There are thus also embodiments of the invention as encompassed and disclosed, which are not explicitly shown and explained in the figures, but by separated

Feature combinations emerge from the described embodiments and can be generated. Embodiments and combinations of features are also to be regarded as disclosed, which thus do not have all the features of an originally formulated independent claim. Moreover, embodiments and combinations of features, in particular by the embodiments set out above, are to be regarded as disclosed, which go beyond or deviate from the combinations of features set out in the back references of the claims.

Showing:

 1 is a schematic side view of a motor vehicle with a

Driver assistance device comprising a radar sensor; FIG. 2 shows the radar sensor with an antenna arrangement from a schematic perspective view; FIG.

Fig. 3 is a supply network of the antenna arrangement of a schematic

 Top view; and

4 shows a first supply line of the supply network from a schematic

 Top view,

5 shows the antenna arrangement as a schematic layout for a printed circuit board.

Fig. 1 shows a motor vehicle 66, in particular a motor vehicle, such as a passenger car or a truck. The motor vehicle 66 comprises a driver assistance device 65 with a radar front end 60. The radar front end 60 is designed to be driven by means of radar waves 64, in particular electromagnetic

Free space waves to detect an environment of the motor vehicle 66. For example, the driver assistance device 65 is a distance control system or an automatic emergency brake system. An evaluation unit 63 is presently designed to evaluate a signal of the radar front end 60. The evaluation unit 63 and the radar front end 60 can be considered together as a radar sensor 70. The driver assistance device 65 may further include a control device 67 for controlling a driving function of the motor vehicle 66 in response to a signal of

Evaluation unit 63 include. For example, the control unit 67 is configured to command emergency braking of the motor vehicle 66.

2 shows the radar front end 60 with a feeder network 1 in an inner layer 1 of an LTCC printed circuit board. The radar front end 60 may include an antenna assembly 6. In the present case, the radar front end 60 also includes a transmitting and / or receiving unit 61. In the present case, the radar front end 60 comprises further antenna arrangements 69. For example, the further ones

Antenna assemblies 69 formed as receiving antennas. For example, the antenna arrangement 6 is designed as a transmitting antenna or as a receiving antenna. The antenna arrangement 6 comprises a feeder network 1 for connecting

Radio-frequency antennas 4 with the transmitting and / or receiving unit 61. In the present case, the transmitting and / or receiving unit 61 is designed to be wired Send electromagnetic waves via the supply network 1 to the high-frequency antennas 4 and / or receive from the high-frequency antennas 4.

The radar front end 60 is disposed on a circuit board 68 made of LTCC. The

Feed line network 1 and / or the high-frequency antennas 4 may be formed by printed conductors of the printed circuit board 60. For example, the printed circuit board 68 of the radar front end 60 comprises a six-layer ceramic substrate, in particular an LTCC substrate.

Preferably, the LTCC substrate has a relative permittivity of greater than 6, more preferably greater than 7, for example, about 8, for example, in the range of 7.8 to 8.1. Due to the high relative permittivity antenna structures, such as the high-frequency antennas 4, miniaturized because the same

Frequency of the conducted electromagnetic wave whose wavelength is lower at a high relative permittivity. Relative permittivities in radar sensors according to the prior art are approximately 4. The dependence of the wavelength and the relative permittivity e _r results from the formulas 1 to 3:

Formula 1 λ = ~ ° Formula 2 f

λ = ^ Formula 3

With c: speed of light; c ₀ : vacuum light speed; Λ: wavelength; λ ₀

Wavelength in vacuum; /: Frequency of the electromagnetic wave.

Preferably, the supply network 1 is shielded on an inner layer of the circuit board 68, in particular between two ground layers (ground layers). An arrangement of the feeder network 1 has certain requirements, for example, in terms of phase relationships, electrical adjustments and design rules of a

PCB manufacturer, meet. This is especially true if the

Antenna structures are miniaturized due to the high relative permittivity. The feeder network 1 can strip conductors, such as strip lines, also

Microstrip called, and / or shielded strip lines, also called stripline include. The high-frequency antennas 4 may be formed by plated-through holes, also called vias, through the printed circuit board 68.

Fig. 3 shows the feeder network 1 from a schematic plan view. The

Supply network comprises a first supply line 2 and at least two second

Supply lines 3. In the present case, the supply network 1 comprises a plurality of second Supply lines 3. The first supply line 2 has a plurality of connections 22, to each of which one of the second supply lines 3 is connected. In the present case are the second

Supply lines 3 connected via a connecting piece 23 to the first supply line 2. In other embodiments of the invention, the connection piece 23 may be designed as part of a respective one of the second supply lines 3. Alternatively, in further embodiments of the invention, the at least two second supply lines 3 may be connected directly to the first supply line 2, in particular without a respective connection piece 23. Each of the second supply lines 3 has several in the present case

Connections 32 for high-frequency antennas 4 on. In particular, the

High frequency antennas 4 arranged and / or connected to the terminals 32. In the present case, the first supply line 2 extends at least substantially along a first spatial direction z. The second leads 3 in the present case run at least in the present case

Essentially according to a second spatial direction y. The two spatial directions y, z are presently arranged perpendicular to each other. Accordingly, the first supply line 2 runs at least substantially perpendicular to the second supply lines 3. The high-frequency antennas 4 can be arranged essentially such that their main radiation direction is perpendicular to the first spatial direction y and to the second

Spatial direction z is.

The high-frequency antennas 4 may be arranged in columns along the first spatial direction z. Alternatively or additionally, the high-frequency antennas 4 may be arranged in rows according to the second spatial direction y. Each one of the second

Feed lines 3 may be arranged to connect the high-frequency antennas 4 of a row with each other. The first supply line 2 may be arranged to connect the individual lines with each other.

The second leads 3 are formed between two adjacent ones of the terminals 32 in a loop 30, respectively. Due to the shape of the loop 30, a respective length 52 between the two of the adjacent terminals 32 may be predetermined. In particular, the length 52 defines a phase relationship of the conducted electromagnetic wave at the two adjacent ones of the terminals 32 and / or at two high frequency antennas 4 connected at the two adjacent ones of the terminals 32. Thus, by the shape of the loops 30 is the

Phase relationship of the high-frequency antennas 4 a line given relative to each other. As a result, a radiation characteristic of the high-frequency antennas 4 can be predetermined according to a second solid angle. In particular, the

Abstrahlcharakteristik the high-frequency antennas 4 according to the second solid angle predetermined by the shape of the loops 30. Again in particular is the

Abstrahlcharakteristik the high-frequency antennas 4 according to the second solid angle at fixed position of the high-frequency antennas 4 by the shape of the loops 30 predetermined. The second solid angle is aligned in particular parallel to a plane which is aligned parallel to the first spatial direction y and perpendicular to the second spatial direction z.

The first feed line 2 is formed between two adjacent ones of the terminals 22 in each case according to a loop 20. Due to the shape of the loop 20, a respective length

50 between the two of the adjacent terminals 22 may be predetermined. By the length 50 is in particular a phase relationship of the conducted

electromagnetic wave at the two adjacent of the terminals 22 set. Thus, by the shape of the loops 20, the phase relationship of the

High frequency antennas 4 a column be given relative to each other. As a result, a radiation characteristic of the high-frequency antennas 4 in accordance with a first

Solid angle be predetermined. In particular, the radiation characteristic of

Radio frequency antennas 4 according to the first solid angle predetermined by the shape of the loops 20. Again, in particular, the emission of the

High frequency antennas 4 according to the first solid angle at the fixed position of

High-frequency antennas 4 by the shape of the loops 20 predetermined. The first

Solid angle is aligned in particular parallel to a plane which is aligned parallel to the second spatial direction z.

In the present case, the second supply line 2 has a first side 28 and a second side 29. This is particularly apparent from Fig. 4. In the present case, the first supply line 2 is divided by a connection 24 into the first side 28 and the second side 29. The loops 20 on the first side 28 in the present case have a different shape than the loops 21 on the second side 29. The length 50 of the second lead 2 between the two adjacent ones of the plurality of terminals 22 on the first side 28 differs from the length 51 in the present case between two adjacent ones of the terminals 22 on the second side 29. Thereby is a radiation 59 with the angle α relative to the second

Room direction y adjustable. For the same length 50 of the first lead 2 between the two adjacent ones of the plurality of terminals 22 on the first side 28 and the length

51 of the first feed line 2 between two adjacent connections 22 on the second side 29 results in a radiation 58, 59 oriented symmetrically to the connection 24. In particular, high-frequency antennas 4 which are connected to the connection 24 via the first side 28 radiate in this case with the angle α off while High-frequency antennas 4, which are connected via the second side 29 to the connection 24, have a radiation 58 with the angle -a with respect to the second spatial direction y. Accordingly, by means of a different shape of the loops 22 on the first side 28 and the second side 29, a particularly directed and / or broad radiation 58, 59 can be set.

Fig. 4 shows schematically the radiation 59 of the high-frequency antennas with the angle a. The length 50 (called x in the formula) results, for example, from formula 4. The length 51 (called Ax ₂ in the formula) results, for example, from formula 5.

Δ ι = - = £ - ^ Formula 4

 d-sin (a) ._. _

Δχ ₂ = ASL ^- = A _SL = - ^ Formula 5

Here, λ _SL corresponds to the wavelength of the electromagnetic wave in the medium

(Conductor), d corresponds to the direct distance of the two adjacent of the plurality of terminals 22, 32 from each other. The phase relationship between two adjacent ones of the plurality of terminals 22, 32 is given by Formula 6:

Δφ = d ^■ sin (a) ^■ - ^■ 360 ° Formula 6

5 shows an exemplary layout for the manufacture of the supply network 1 on the printed circuit board 68. The loops 20, 21 of the first supply line 2 are omitted in the example according to FIG. 5. Well recognizable are plated-through holes 27, so-called vias, for connecting masses. Layers or ground layers of the printed circuit board 68. The plated-through holes 27 are also called ground vias for this reason. The mass layers may be with respect to the plane of Fig. 5 above and below the

Supply network 1 may be arranged. In other words, the ground layers can frame the feeder network 1 on two sides. In this way, a particularly good shielding of the supply network 1 is given.

Preferably, the radar front end 60 is aligned with the motor vehicle 66 such that the first lead 2 is vertically aligned. In other words, the first spatial direction z extends in the vertical and / or perpendicular to a ground plane on which the motor vehicle 66 stands. This is indicated by a directional arrow 57 in FIG. 1. Due to the shape of the loops 20, 21 of the first supply line 2, in this case the radiation 59 can be predetermined in accordance with an elevation angle or in elevation. Of the

In this case, the elevation angle can correspond in particular to the angle α. Of the Elevation angle is in particular an angle between the radiation 59 and the plane on which the motor vehicle 66 stands.

Preferably, the radar front end 60 is arranged on the motor vehicle 66 in such a way that, due to the shape of the loops 30, an emission according to an azimuth angle or in azimuth can be predetermined. The azimuth angle lies in particular in a plane which runs parallel to the plane on which the motor vehicle 66 is located. By the appropriate orientation of the radar front end 60 and the

Antenna assembly 6 is a predetermining a deflection of the radar beam in azimuth and elevation simultaneously and independently possible. To specify the

Abstrahlcharakteristik according to the elevation angle, the loops 20, 21 of the first lead 2 are adaptable. To specify the radiation characteristic according to the

Azimutwinkel the loops 30 of the second leads 3 are adaptable.

By means of the present antenna arrangement 6, a radar front end 60 can be provided, which can be any number of columns and / or rows

High frequency antennas 4 has. This allows a bundling of the radiation of the radar front end 60 both in accordance with the azimuth angle and according to the

Be predetermined elevation angle. For example, a smaller / larger number of columns, for example compared to a basic value, results in a lower / greater concentration of the radiation according to the azimuth angle. For example, with respect to a further basic value, a smaller / larger number of lines results in a lesser / greater concentration of the radiation according to the elevation angle. The respective lengths 50, 51, 52 between the terminals 22, 32 can each be constant. For another embodiment of the antenna arrangement 6 with more or less high-frequency antennas 4, only the feeder network 1 and the number of high-frequency antennas 4 need to be adapted. For example, the second

Feed lines 3 are each extended by a loop 30 and a radio-frequency antenna 4 to increase the number of columns. By way of example, the first supply line 2 can be extended by a connection 22 to which a further second supply line 3 is arranged together with further high-frequency antennas 4 in order to increase the number of lines by one.

By the number of rows and / or columns, the bundling according to the

Elevation angle and / or the azimuth angle be predetermined separately. Thus, the emission characteristic of the antenna arrangement 6 is particularly preferred

or the radar front end 60 both in terms of bundling and in Reference to the emission direction in elevation and in azimuth independently definable. As a result, an antenna kit is available through which many different radiation characteristics or radiation patterns can be realized. A high number of columns and / or rows is of particular interest with regard to a very highly concentrated front radar antenna.

Claims

claims 1 . Antenna arrangement (6) for a radar front end (60), with  - High frequency antennas (4) for transferring electromagnetic energy, and - A supply network (1), by means of which the high-frequency antennas (4) with a transmitting unit and / or a receiving unit (61) are connectable, wherein - The high-frequency antennas (4) and the supply network (1) by tracks of a printed circuit board (68) are formed, and wherein  - The supply line network (1) has a first supply line (2) in a first spatial direction (z) and at least two second leads (3) in a second spatial direction (y), wherein at a plurality of terminals (22) of the first supply line (2) respectively one of the second supply lines (3) is connected and in each case one of the high-frequency antennas (4) is connected to a plurality of terminals (32) of each of the second supply lines (3),  characterized in that  - The first supply line (2) and the second supply lines (3) between two  adjacent ones of the plurality of terminals (22, 32) are each formed in a loop (20, 30) and a respective length (50, 52) of the affected lead (2, 3) between the two adjacent ones of the plurality of terminals (22, 32) constant position of the high-frequency antennas (4) by a respective shape of the loop (20, 30) can be predetermined. 2. Antenna arrangement (6) according to one of the preceding claims,  characterized in that  the two adjacent ones of the terminals (32) of the second supply lines (3) and two further adjacent ones of the terminals (32) of the second supply lines (3) are each spaced by the same length (52). 3. antenna arrangement (6) according to one of the preceding claims,  characterized in that the printed circuit board (68) is formed as LTCC printed circuit board, wherein a relative permittivity of a dielectric of the printed circuit board (68) is at least 6. 4. Antenna arrangement according to one of the preceding claims,  characterized in that  the first supply line (2) and the second supply lines (3) extend at least substantially perpendicular to one another. 5. Antenna arrangement according to one of the preceding claims,  characterized in that  the first supply line (2) and the second supply lines (3) are part of a rake-shaped structure. 6. Antenna arrangement according to one of the preceding claims,  characterized in that  the first feed line (2) has a first side (28) and a second side (29), wherein at least two of the plurality of connections (22) are arranged on both sides and a loop (20) is arranged between two adjacent ones of the several connections (22 ) on the first side (28) and a loop (21) between two adjacent ones of the plurality of terminals (22) on the second side (29) are shaped differently. 7. Antenna arrangement according to claim 6,  characterized in that  the first feed line (2) between the first side (28) and the second side (29) has a connection (24) for connecting to the transmitting unit and / or the  Receiving unit (61). 8. Radar front end (60) with an antenna arrangement (6) according to one of  previous claims. 9. driver assistance device (65) with a radar front end (60) according to claim 8. 10. Motor vehicle (66) with a driver assistance device (65) according to claim 9. 1 1. Motor vehicle (66) according to claim 10,  characterized in that the emission characteristic of the antenna arrangement (6) according to a Elevation angle through the length (50, 51) between the two adjacent of the plurality of terminals (22) on the first supply line (2) is predetermined. 12. motor vehicle (66) according to claim 10 or 1 1,  characterized in that  the radiation characteristic of the antenna arrangement (6) is predetermined according to an azimuth angle through the length (52) between the two adjacent ones of the plurality of terminals (32) on the second supply lines (3). 13. A method for producing an antenna arrangement (6), comprising the steps:  Predetermining fixed positions for radio-frequency antennas (4) on a substrate, - contacting the radio-frequency antennas (4) by means of a supply network (1) having a first supply line (2) in a first spatial direction (z) and at least two second supply lines (3) in a second spatial direction (y), wherein at several terminals ( 22) of the first supply line (2) each one of the second leads (3) is connected and at a plurality of respective terminals (32) of each of the second leads (3) each one of the high-frequency antennas (4) is connected, and - Setting a radiation characteristic of the antenna assembly (6) by setting a respective length (50, 51, 52) of the first supply line (2) and the second  Supply lines (3) each between two adjacent of the plurality of terminals (22, 32).