KR101962705B1 - Array antenna for reducing SLL(sidelobe level) - Google Patents

Abstract

A coupling type SLL improved array antenna and a coupling type SLL improved array antenna implementation method are disclosed. A coupling type SLL (sidelobe level) improved array antenna includes a feed line for supplying power to a plurality of radiators and a plurality of radiators supplied with power by the feed line, wherein the plurality of radiators are connected to the first side Or on the second side facing the first side.

Description

An array antenna for reducing SLL (sidelobe level)

The present invention relates to an array antenna, and more particularly, to an array antenna capable of reducing the SLL and an implementation method thereof.

Front / side / rear radars are mounted according to the electronicization of the vehicle, and the radars are equipped with antennas operating at frequencies of 24 GHz, 77 GHz and 79 GHz. These antennas can be designed in the form of array antennas for high gain depending on the detection distance of radar.

It is important to reduce the SLL of the antenna as much as possible in order to lower the false detection rate, and reducing the SLL should be considered important when designing the array antenna.

10-2010-0012408

It is an object of the present invention to provide an SLL reduced array antenna.

Another object of the present invention is to realize an SLL reduced array antenna.

A sidelobe level reduced array antenna (SLL) according to an aspect of the present invention includes a feed line for supplying power to a plurality of radiators and the plurality of radiators to which power is supplied by the feed line, And may be located on the first side relative to the feed line and on the second side facing the first side.

On the other hand, the plurality of radiators includes a first radiator group positioned on the first side and a second radiator group positioned on the second side, and the first radiator group includes a radiator 2n-1 (N is a natural number) of the plurality of radiators, and the radiator 2n-1 and the radiator 2n are coupled to each other with respect to the feeding line, and the second radiator group includes a radiator 2n A ring group can be formed.

The distance between the radiator 2n-1 and the radiator 2n included in each of the n-th coupling groups and the feeder line may be set according to the value of n.

In addition, the thickness of the feed line may not be constant so that the interval is set according to the value of n.

When n is 6, the radiator 1 and the radiator 2 are coupled based on the feed line to form a first coupling group. The radiator 3 and the radiator 4 are coupled to each other by a couple And the radiator 5 and the radiator 6 are coupled based on the feed line to form a third coupling group, and the radiator 7 and the radiator 8 are connected to each other via the feed line And the radiator 9 and the radiator 10 are coupled based on the feed line to form a fifth coupling group, and the radiator 11 and the radiator 12 are coupled to the feed line And the distance between the radiator 1 included in the first coupling group and the radiator 2 and the feed line and the gap between the radiator 1 and the feed line, Wherein a distance between the radiator 11, the radiator 12, and the feeder line included in the second coupling group is a first interval, a gap between the radiator 3 included in the second coupling group and the radiator 4 and the feeder line, The spacing between the radiator 9 included in the group, the radiator 10, and the feeder line is a second interval, and the interval between the radiator 5 included in the third coupling group and the radiator 6 and the feeder line, The spacing between the radiator 7 and the radiator 8 and the feeder line included in the ring group may be a third spacing, the first spacing may be greater than the second spacing, and the second spacing may be greater than the third spacing.

In addition, the feed line may be formed so that the width of the line decreases as the distance from the center of the feed line increases.

In addition, the plurality of radiators may be arranged in parallel on the first side and the second side so that the impedance increases as the distance from the center increases.

In the SLL reduced array antenna according to the embodiment of the present invention, the performance of the antenna can be improved by reducing cross polarization while lowering the SLL.

1 is a conceptual view showing a conventional antenna structure
2 is a conceptual diagram illustrating an array antenna according to an embodiment of the present invention.
3 is a graph illustrating an SLL reduced array antenna according to an embodiment of the present invention.
4 is a graph illustrating an SLL reduced array antenna according to an embodiment of the present invention.
5 is a conceptual diagram illustrating a structure of an SLL reduced array antenna according to an embodiment of the present invention.
6 is a conceptual diagram showing a Chebyshev voltage distribution in a single emitter according to an embodiment of the present invention
7 is a conceptual diagram illustrating the structure of an SLL reduced array antenna according to an embodiment of the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a conceptual diagram illustrating a conventional antenna structure.

FIG. 1 shows the structure of a radiator and a feed line of a conventional antenna structure, and a radiation pattern and a simulation result of an existing antenna.

Referring to FIG. 1 (a), in the conventional antenna structure, the spacing between the radiator and the feed line may be the same.

In Fig. 1 (b), the radiation pattern of the 24 GHz array antenna is started. It can be seen that the SLL of the 24 GHz array antenna is 11 dB (decibel) and the peak gain is 12.9 dBi.

In Fig. 1 (c), simulation results of a 24 GHz array antenna are disclosed. In the case of the conventional antenna structure, it can be confirmed that the SLL (sidelobe level) has a large value.

Hereinafter, a structure for reducing the SLL of the array antenna is disclosed in the embodiment of the present invention.

An array antenna for application to a vehicle radar requires lowering the sidelobe level (SLL) to lower the antenna o-detection rate. In order to lower the SLL, there is a method of making the size of the single emitter of the array antenna different. However, as the size of the single emitter is made different from each other, the larger the size of the emitter, the more the cross-polarization is generated according to the current flow, and the performance of the antenna may deteriorate.

2 is a conceptual diagram illustrating an array antenna according to an embodiment of the present invention.

2, a structure of an array antenna for reducing the SLL is disclosed.

Referring to FIG. 2, a 24 GHz array antenna is disclosed. In order to reduce the SLL of the antenna, the size of the single radiator is designed to be the same but the impedance of the feeding line and the feeding line are changed.

The SLL reduction array antenna according to the embodiment of the present invention can be used in various fields. It should be noted that the vehicle is equipped with radars according to the automation of the vehicle, and it is needless to say that the SLL reduced array antenna according to the embodiment of the present invention can be used in a radar mounted on a vehicle.

The end feeding method has a higher SLL than the center feeding method. Therefore, the antenna can be designed to lower the SLL of the antenna by the end feeding method.

The SLL reduction array antenna according to the embodiment of the present invention may have a structure in which a single radiator is coupled to the left and right with reference to the feed line to supply power.

The antenna may include a plurality of radiators, and the plurality of radiators may be positioned and coupled symmetrically with respect to the feed line. For example, the first radiator group 270 may be positioned on the first side and the second radiator group 280 may be positioned on the second side with respect to the feed line. The first radiator included in the first radiator group 270 and the second radiator included in the second radiator group 280 may be coupled.

Specifically, the first radiator group 270 may include the radiator 1 210, the radiator 3 220, the radiator 5 230, the radiator 7 240, the radiator 9 250, and the radiator 11 260 The second radiator group 280 may include the radiator 2 215, the radiator 4 225, the radiator 6 235, the radiator 8 245, the radiator 10 255 and the radiator 12 265.

The radiator 1 210 and the radiator 2 215 may be coupled based on the feed line and the radiator 3 220 and radiator 4 225 may be coupled based on the feed line and the radiator 5 230 And radiator 6 235 may be coupled with reference to the feeder line and radiator 7 240 and radiator 8 245 may be coupled based on the feeder line and radiator 9 250 and radiator 10 (255) may be coupled based on the feed line, and the radiator 11 (260) and the radiator 12 (265) may be coupled based on the feed line.

Hereinafter, for convenience of description, the radiator 1 210 and the radiator 2 215 are referred to as a first coupling group 213, a radiator 3 220 and a radiator 4 225 in the second coupling group The third coupling group 233, the radiator 7 240 and the radiator 8 245 to the fourth coupling group 243, the radiator 9 250, and the third coupling group 233, the radiator 5 230 and the radiator 6 235, And radiator 10 255 can be divided into a fifth coupling group 253, a radiator 11 260 and a radiator 12 265 into a sixth coupling group 263.

According to the embodiment of the present invention, the spacing between the feed line 200 and the emitters included in each coupling group can be set to be different from each other.

For example, the interval between the first coupling group 213 and the feed line 200 may be the first interval. The interval between the second coupling group 223 and the feed line 200 may be a second interval. The interval between the third coupling group 233 and the feed line 200 may be the third interval. The interval between the fourth coupling group 243 and the feed line 200 may be the fourth interval. The interval between the fifth coupling group 253 and the feeding line 200 may be the fifth interval. The gap between the sixth coupling group 263 and the feed line 200 may be the sixth gap.

The sixth interval (the interval between the sixth coupling group 263 and the feeding line 200) and the sixth interval (the interval between the first coupling group 213 and the feeding line 200) and the sixth interval (the interval between the sixth coupling group 263 and the feeding line 200) For example. (The distance between the second coupling group 223 and the feed line 200) and the fifth interval (the interval between the fifth coupling group 253 and the feed line 200) may be the same. The third interval (the interval between the third coupling group 233 and the feed line 200) and the fourth interval (the interval between the fourth coupling group 243 and the feed line 200) may be the same.

(Interval between the first coupling group 213 and the feed line 200) and the sixth interval (interval between the sixth coupling group 263 and the feed line 200) are used for impedance matching They may be different. The fifth interval (the interval between the fifth coupling group 253 and the feed line 200) and the second interval (the interval between the second coupling group 223 and the feed line 200) are different from each other for impedance matching It is possible. The fourth interval (the interval between the fourth coupling group 243 and the feed line 200) is different for the impedance matching from the third interval (the interval between the third coupling group 233 and the feed line 200) It is possible.

The distance between the first coupling group 213 and the feed line 200, the second gap (the distance between the second coupling group 223 and the feed line 200), the third gap (the distance between the first coupling group 213 and the feed line 200) The distance between the third coupling group 233 and the feeding line 200). Similarly, the sixth interval (the interval between the sixth coupling group 263 and the feed line 200), the fifth interval (the interval between the fifth coupling group 253 and the feed line 200), the fourth interval The distance between the fourth coupling group 243 and the feed line 200).

(First interval, sixth interval)> (second interval, fifth interval)> (third interval, fourth interval).

In the SLL reduced array antenna according to the embodiment of the present invention, the gap between the single radiator and the feed line is changed to adjust the amount of coupling coupled to each radiator, and the impedance of the feed line is changed to reduce the SLL .

These intervals (the first interval (the interval between the first coupling group 213 and the feed line 200), the second interval (the interval between the second coupling group 223 and the feed line 200) (The interval between the third coupling group 233 and the feed line 200), the fourth interval (the interval between the fourth coupling group 243 and the feed line 200), the fifth interval The feeding line 200 may have different thicknesses for the difference between the sixth interval (interval between the group 253 and the feeding line 200) and the sixth interval (interval between the sixth coupling group 263 and the feeding line 200) .

For example, the feed line 200 may have different thicknesses, such as a first thickness, a second thickness, and a third thickness.

(The first radiator 210, the radiator 3 220, the radiator 5 230, the radiator 7 240, the radiator 9 250, and the radiator 11 260) of the first radiator group and the second radiator group The single emitter (emitter 2 215, emitter 4 225, emitter 6 235, emitter 8 245, emitter 10 255, emitter 12 265) may be arranged parallel to the feed line have.

The feed line 200 may be implemented in the form of thickening in the order of the first thickness, the second thickness, and the third thickness.

(The distance between the first coupling group 213 and the feed line 200), the second gap (the distance between the second coupling group 223 and the feed line 200) due to the difference in thickness of the feed line 200, A distance between the fourth coupling group 243 and the feed line 200 is set to a value larger than the interval between the third coupling group 233 and the feed line 200, ), The fifth interval (the interval between the fifth coupling group 253 and the feed line 200), and the sixth interval (the interval between the sixth coupling group 263 and the feed line 200) .

The first thickness can determine the first gap (the distance between the first coupling group 213 and the feed line 200) and the sixth gap (the gap between the sixth coupling group 263 and the feed line 200) have. The second thickness may be a second gap (a gap between the second coupling group 223 and the feed line 200) and a fifth gap (a gap between the fifth coupling group 253 and the feed line 200) . The third thickness can determine the third gap (the distance between the third coupling group 233 and the feed line 200) and the fourth gap (the gap between the fourth coupling group 243 and the feed line 200) have.

In addition, the SLL reduction array antenna according to the embodiment of the present invention may be arranged such that the intervals between the radiators are spaced apart to make the main beam 0 degrees.

Specifically, the interval between the first radiator 210, the third radiator 220, the radiator 5 230, the radiator 7 240, the radiator 9 250, and the radiator 11 260 included in the first radiator group is set to be It is possible to set the interval I to make the main beam zero. For example, if the interval between radiator 1 210 and radiator 3 220 is I, the distance between radiator 3 220 and radiator 5 230 is I, and the distance between radiator 5 230 and radiator 240 240 The distance between the radiator 7 (240) and the radiator 9 (250) is I, and the spacing between the radiator 9 (250) and the radiator 11 (260)

Similarly, the spacing between the radiator 2 (215), radiator 4 (225), radiator 6 (235), radiator 8 (245), radiator 10 (255), and radiator 12 (265) It is possible to set the interval I to make the main beam zero. For example, if the distance between the radiator 2 (215) and radiator 4 (225) is I, the distance between radiator 4 (225) and radiator 6 (235) is I, The distance between the radiator 8 (245) and the radiator 10 (255) is I, and the interval between the radiator 10 (255) and the radiator 12 (265)

Through the above structure, the SLL abatement array antenna can reduce the SLL and reduce the cross polarization to improve the performance of the antenna.

3 is a graph illustrating an SLL reduced array antenna according to an embodiment of the present invention.

In Fig. 3, the radiation pattern of the antenna is disclosed.

Referring to FIG. 3, it can be seen that the SLL is reduced and the cross polarization is reduced by the SLL reduction array antenna, thereby improving the performance of the antenna.

4 is a graph illustrating an SLL reduced array antenna according to an embodiment of the present invention.

4, simulation results of a 24 GHz array antenna are disclosed.

Referring to FIG. 4, the simulation results show that the SLL value at 24 GHz is 19 dB, which is within the range of 18 to 20 dB, which is the SLL level applied to the current vehicle radar.

Therefore, the SLL reduced array antenna according to the embodiment of the present invention is applicable to various fields as well as a vehicle radar.

Hereinafter, a structure of an SLL reduced array antenna according to an embodiment of the present invention is specifically disclosed in the embodiments of the present invention.

5 is a conceptual diagram illustrating a structure of an SLL reduced array antenna according to an embodiment of the present invention.

Referring to Figure 5, the first length 520 is the length of a single emitter.

The first length 520 may be a value corresponding to half of the wavelength of the center frequency of the operating frequency range of the antenna (half the wavelength of the tube).

The wavelength λ of the center frequency determined from the formula C (luminous flux) = f (center frequency) * λ (center frequency) can be determined and the formula λ / (ε) -0.5 (ε: ). ≪ / RTI >

The second length 510 may be the transverse length of a single emitter. The second length 510 adjusts the impedance of the single emitter. The longer the length, the lower the impedance of the single emitter. The shorter the length, the higher the impedance of the single emitter. The second length 510 can be adjusted to a length less than half of the in-vessel wavelength for current structures for cross polarization reduction due to the coupling structure.

The third length 530 may be adaptively changed according to the voltage distribution. Specifically, the third length 530 determines the voltage distribution in a single emitter using the Chebyshev or Tayler scheme, which is a way to reduce the SLL, and can be spaced according to the determined voltage.

6 is a conceptual diagram showing a Chebyshev voltage distribution in a single emitter according to an embodiment of the present invention

In Figure 6, a method for following the above Chebyshev distribution in each single emitter is disclosed.

The SLL reduced array antenna according to the embodiment of the present invention can be implemented based on the change of the distance of the feeder line and the change of the impedance of the feeder line.

In the above distribution, for a single emitter with a Chebyshev voltage distribution of 0.54, the separation distance between the feed line and the single emitter should be set to be the widest as compared to the other emitter to minimize the coupling between the feed line and the single emitter. That is, as the value of Chebyshev distribution increases, the width of the feed line must be increased to reduce coupling between the single radiator and the feed line. Conversely, the lower the value of the Chebyshev distribution, the narrower the feed line should be, and the coupling between the single radiator and the feed line should be widened to reduce the coupling. In addition, the Chebyshev distribution is lowered from the center to the left and right as shown in the above figure, and the SLL value is lowered according to this distribution.

Since the widths of the feed lines are made different from each other, the impedance changes at each portion where the width of the feed line changes, and the impedance becomes lower toward the center and becomes higher toward the left and right. The impedance at the center (about 45 ohms) is low, so the S11 value decreases and the reflected wave decreases. As a result, the S21 value also increases and the power transmission loss decreases. On the other hand, as the width of the feed line decreases to the left and right, the impedance becomes higher (about 70 ohms). As a result, the S11 value increases and the S21 value decreases due to the increase of the reflected wave. This difference in power transfer has a Chebyshev voltage distribution to reduce the SLL along with the coupling generated by the spacing between the feed line and the single emitters. In addition, the above-mentioned impedance of the feed line is not fixed, and a line having a high impedance has a smaller width, resulting in a manufacturing difficulty. Therefore, if the impedance at the center portion is set slightly lower, the line width can be manufactured even in the case of a line having high impedance at the left and right ends.

In the above embodiment, the Chebyshev distribution is a case where the number of elements of a single emitter is 6 and Chebyshev distribution is different when the number of elements is different. Therefore, the width of the feed line is changed according to the Chebyshev distribution corresponding thereto and the impedance of the feed line Can be changed.

When this structure is implemented in reverse, the SLL value is degraded to about 11 dB. Therefore, in order to lower the SLL, the feed line width at the center portion must be wide so that the impedance should be low, and the width of the feed line must be reduced toward the left and right so that the impedance becomes high.

7 is a conceptual diagram illustrating the structure of an SLL reduced array antenna according to an embodiment of the present invention.

The structure of the SLL reduced array antenna according to the embodiment of the present invention can be designed as a feed line having various forms as follows. It is needless to say that it is possible to design a feed line in which the width of a line is controlled in a stepped shape although not shown in the figure.

The SLL reduced array antenna according to the embodiment of the present invention is implemented by adjusting the distance between the single radiator and the feed line by adjusting the width of the feed line so that the impedance of the center portion of the feed line is always low and the impedance of the feed line Can be increased.

The above-described methods may be implemented in an application or may be implemented in the form of program instructions that may be executed through various computer components and recorded on a computer-readable recording medium. The computer-readable recording medium may include program commands, data files, data structures, and the like, alone or in combination.

The program instructions recorded on the computer-readable recording medium may be those specially designed and configured for the present invention and may be those known and used by those skilled in the computer software arts.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like.

Examples of program instructions include machine language code such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules for performing the processing according to the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

Claims (7)

As an SLL reduced array antenna,
A feed line for supplying power to a plurality of radiators; And
The plurality of emitters being supplied with electric power by the feed line,
Wherein the plurality of radiators are located on a first side with respect to the feed line and on a second side facing the first side,
Wherein the feed line is configured such that the width of the line decreases as the distance from the center of the feed line increases. The method according to claim 1,
The plurality of radiators including a first radiator group positioned on the first side and a second radiator group positioned on the second side,
Wherein the first radiator group includes a radiator 2n-1 (n is a natural number) among the plurality of radiators,
The second radiator group includes a radiator 2n (n is a natural number) among the plurality of radiators,
And the radiator 2n-1 and the radiator 2n form an n-th coupling group to be coupled with respect to the feeder line. 3. The method of claim 2,
Wherein an interval between the radiator 2n-1 and the radiator 2n included in each of the n-th coupling groups is set according to a value of n. The method of claim 3,
And the thickness of the feed line is not constant so that the interval is set according to the value of n. 5. The method of claim 4,
When n is 6, the radiator 1 and the radiator 2 are coupled based on the feed line to form a first coupling group, and the radiator 3 and the radiator 4 are coupled based on the feed line And the radiator (5) and the radiator (6) are coupled based on the feed line to form a third coupling group, and the radiator (7) and the radiator (8) And the radiator 9 and the radiator 10 are coupled based on the feeder line to form a fifth coupling group, and the radiator 11 and the radiator 12 are connected to each other via the feeder line To form a sixth coupling group,
An interval between the radiator 1 included in the first coupling group, the radiator 2 and the feeder line, and a gap between the radiator 11 and the radiator 12 included in the sixth coupling group are set to a first interval ,
An interval between the radiator 3 included in the second coupling group, the radiator 4 and the feeder line, and a gap between the radiator 9 included in the fifth coupling group and the radiator 10 and the feeder line are the second intervals ,
The interval between the radiator 5 included in the third coupling group, the radiator 6 and the feeder line, and the interval between the radiator 7 included in the fourth coupling group and the radiator 8 and the feeder line are third intervals ,
Wherein the first interval is larger than the second interval,
And the second spacing is greater than the third spacing. delete The antenna according to claim 1,
Wherein the first and second antennas are disposed in parallel to each other so that the impedance increases as the antenna is further away from the center.

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