KR20200106671A - Dual band monopole array antenna apparatus for direction detection - Google Patents

Abstract

Provided is a dual band monopole antenna which includes a monopole radiation element composed of a monopole in which a plurality of branch lines are formed and a dielectric substrate on which a monopole element is printed. The monopole may include a first branch line disposed at the center of the monopole element and operating in a first frequency band and a plurality of second branch lines disposed outside the first branch line and operating in a second frequency band.

Description

A dual band monopole array antenna device for direction detection and its method {DUAL BAND MONOPOLE ARRAY ANTENNA APPARATUS FOR DIRECTION DETECTION}

The present invention relates to a dual band array antenna device for detecting the direction of a GPS jamming signal.

GNSS signals are operated in several frequency bands (eg, GPS L1 band, GPS L2 band, GLONASS L1 band, etc.). Recently, jamming of GNSS signals affects the operation of wireless communication equipment/systems, causing technical, economic, and social problems. There is a need to develop a direction detection system equipped with a small unmanned aerial vehicle to accurately find the location of such a GNSS jamming signal source.

In the conventional omnidirectional broadband array antenna for direction detection, the length of the monopole or dipole antenna is determined to be λ ₀ /4 or λ ₀ /2 in order to find the correct jamming signal band applied to the GNSS signal band, and the conductor diameter of the antenna is thick. Or, it includes a broadband antenna element having a conical shape. However, the conventional broadband antenna element can provide stable radiation characteristics, but has a disadvantage in that it is limited in use by mounting it on a small unmanned aerial vehicle because it is large and heavy in size.

Accordingly, there is a demand for an antenna device including an antenna element having a reduced weight and size while maintaining performance compared to a conventional antenna element.

The present invention can provide a dual-band monopole antenna having a smaller size compared to the conventional antenna device.

A dual band monopole antenna according to an embodiment of the present invention includes a monopole radiating element comprising a monopole having a plurality of branch lines formed thereon and a dielectric substrate on which the monopole element is printed, the monopole being disposed at the center of the monopole element, A first branch line operating in a first frequency band; And a plurality of second branch lines disposed outside the first branch lines and operating in a second frequency band.

According to an embodiment of the present invention, by forming the first branch line 130 and the second branch line 140 operating in different frequency bands on the dielectric substrate 120, a smaller size compared to the conventional antenna device. A dual band monopole antenna can be provided.

In addition, according to an embodiment of the present invention, the size of the antenna device is made by fabricating a radiating element including the first branch line 130 and the second branch line 140 operating in different frequency bands in a printed structure. It can be used as an array antenna device for direction detection for mounting a small unmanned aerial vehicle to find a GNSS jamming signal source by reducing and weight.

1 is a view showing a monopole radiating element of a dual band monopole array antenna device according to an embodiment of the present invention.
2 is an example of a dual band monopole array antenna device according to an embodiment of the present invention.
3 is an example of input return loss characteristics of a monopole radiating device according to an embodiment of the present invention.
4 is an example of a Smith chart of a monopole radiating device according to an embodiment of the present invention.
5 is an example of isolation characteristics between input terminals of a dual-band monopole array antenna device according to an embodiment of the present invention.
6 is an example of a radiation pattern of a dual band monopole array antenna device according to an embodiment of the present invention.
7 is another example of a radiation pattern of a dual band monopole array antenna device according to an embodiment of the present invention.
8 is another example of a radiation pattern of a dual band monopole array antenna device according to an embodiment of the present invention.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. However, since various changes may be made to the embodiments, the scope of the rights of the patent application is not limited or limited by these embodiments. It should be understood that all changes, equivalents, or substitutes to the embodiments are included in the scope of the rights.

The terms used in the examples are used for illustrative purposes only and should not be interpreted as limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiment belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

In addition, in the description with reference to the accompanying drawings, the same reference numerals are assigned to the same components regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the embodiments, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the embodiments, the detailed description thereof will be omitted.

1 is a view showing a dual band monopole array antenna device according to an embodiment of the present invention.

The dual-band monopole array antenna device may include a ground plane 110, a dielectric substrate 120, and a monopole element, as shown in FIG. 1.

The ground plane 110 supplies power to the dielectric substrate 120 and the monopole device, and grounds the dielectric substrate 120 and residual power generated from the monopole device.

The dielectric substrate 120 may be a substrate on which a monopole device is printed. For example, the dielectric substrate 120 may be a radio frequency (RF) dielectric substrate.

The monopole device may be formed by flat-printing a plurality of branch lines for operating in a dual frequency band on the dielectric substrate 120.

The first branch line 130 is disposed at the center of the monopole element, and can operate in a first frequency band.

The second branch lines 140 are disposed outside the first branch lines 130 and may operate in a second frequency band. In this case, the second frequency band may be a higher band than the first frequency band. For example, a first frequency band may be a GPS L2 band and a second frequency band may be a GPS L1 & Glonass band.

Also, the line width and length of the first branch line 130 and the second branch line 140 may be determined according to the first frequency band and the second frequency band, respectively.

In addition, the stub line 150 connected to the lower end of the first branch line 130 and the second branch line 140 and the input transmission line length Li may be adjusted for input impedance matching.

In addition, in FIG. 1, a monopole element is formed with one first branch line 130 and two second branch lines 140, but depending on the embodiment, a plurality of second branch lines 130 may be included. , The number of the second branch lines 140 may be changed.

Design parameters of branch lines included in the monopole device of FIG. 1 may have values shown in Table 1.

Item Components (design variables) Design value Monopole element Center Radiation Line (Wf1, Lf1) 2.0, 43.5 mm
3.0, 50.0 mm
3.0, 49.0 mm Outer radiation lines (Wf2, Lf2) 2.0, 31.0 mm
1.0, 29.0 mm
1.0, 29.0 mm Track spacing (Wg) 0.52 mm
0.50 mm
0.50 mm Input open stub line
(Ws, Ls) 2.0, 5.48 mm
2.0, 2.00 mm
2.0, 2.00 mm Input transmission line (Wi, Li) 2.0, 1.55 mm
2.0, 1.55 mm
2.0, 2.05 mm Input characteristic impedance 50 W

The dual-band monopole array antenna device according to an embodiment of the present invention forms a first branch line 130 and a second branch line 140 operating in different frequency bands on the dielectric substrate 120, thereby forming a conventional antenna. It is possible to provide a dual-band monopole antenna having a smaller size than the device.

In addition, the dual-band monopole array antenna device according to an embodiment of the present invention is manufactured in a print-type structure, thereby reducing the size and weight of the antenna device to find a GNSS jamming signal source. Can be used as.

2 is an example of a dual band monopole array antenna device according to an embodiment of the present invention.

The dual-band monopole array antenna device may include a plurality of unit radiating elements. For example, FIG. 2 may be a dual band monopole array antenna device for anti-explosion in which 5 unit radiating elements are linearly arranged by 1x5. At this time, the unit radiating elements are trident type in which first branch lines 130 and second branch lines 140 operating in different frequency bands are formed on the dielectric substrate 120 of FIG. 1 as shown in the cross-sectional view 201. It may include a monopole device.

In addition, since the radiating elements operate in different first and second frequency bands, the first radiating element 210, the second radiating element 220, and the third radiating element 230 as shown in FIG. 2 , The fourth radiating element 240, and the fifth radiating element 250 may include first branch lines and second branch lines of different lengths and widths.

For example, in the dual band monopole array antenna device, the length and width of the first branch lines and the second branch lines included in the first and fifth radiating elements 210 and 250 to form a symmetrical structure This can be the same. In addition, the lengths and widths of the first branch lines and the second branch lines included in the second radiating element 220 and the fourth radiating element 240 may be the same. That is, the dual band monopole array antenna device shown in FIG. 2 may be composed of three types of radiating elements.

For example, the dielectric substrate 120 may be an FR4 substrate (dielectric constant of 4.4, thickness of 1.6 mm). In addition, the radome coupled to the trident monopole element may be formed in a cylindrical structure made of ABS material having a diameter (D) of 26.0 mm, as shown in the side view 202 and the top view 203.

In this case, the arrangement interval dx may be 93.6 mm, which is a half-wavelength at 1.602 GHz, which is the highest frequency band in the operation band, so that the grating lobe characteristic does not occur. At this time, the mutual coupling characteristic between the first radiating element 210 and the second radiating element 220 or the mutual coupling characteristic between the fourth radiating element 240 and the fifth radiating element 250 is about 12 dB according to the arrangement interval. Can have. On the other hand, the mutual coupling characteristic between the second radiating element 220 and the third radiating element 230 or the mutual coupling characteristic between the third radiating element 230 and the fourth radiating element 240 is about 10 dB. Compared to the mutual coupling characteristic between 210 and the second radiating element 220 or the mutual coupling characteristic between the fourth radiating element 240 and the fifth radiating element 250, it may be further deteriorated by 2 dB.

At this time, since the mutual coupling characteristics between the radiating elements affect the input return loss characteristics of each input terminal, it may be necessary to adjust (tuning) design parameters of each radiating element.

For example, design elements and design values of each of the radiating elements may be as shown in Table 2.

Item Components (design variables) Design value Remark Radiating element Center Radiation Line (Wf1, Lf1) 2.0, 43.5 mm
3.0, 50.0 mm
3.0, 49.0 mm @ 1st, 5th radiating element
@ 2nd and 4th radiating element
@ 3rd radiating element Outer radiation lines (Wf2, Lf2) 2.0, 31.0 mm
1.0, 29.0 mm
1.0, 29.0 mm @ 1st, 5th radiating element
@ 2nd and 4th radiating element
@ 3rd radiating element Track spacing (Wg) 0.52 mm
0.50 mm
0.50 mm @ 1st, 5th radiating element
@ 2nd and 4th radiating element
@ 3rd radiating element Input open stub line
(Ws, Ls) 2.0, 5.48 mm
2.0, 2.00 mm
2.0, 2.00 mm @ 1st, 5th radiating element
@ 2nd and 4th radiating element
@ 3rd radiating element Input transmission line (Wi, Li) 2.0, 1.55 mm
2.0, 1.55 mm
2.0, 2.05 mm @ 1st, 5th radiating element
@ 2nd and 4th radiating element
@ 3rd radiating element Input characteristic impedance 50 W Dual Band Monopole Array Antenna Device Unit antenna dimensions (D x H) 26 x 56 mm Radome (ABS) dimensions Number of arrays 1x5 Array spacing (dx) 93.6 mm Plate dimensions (WxLxH) 30 x 468 x 60 mm
(T=4.0mm) Aluminum material,
Grounding function and antenna element fixing support function

Simulated S-parameter characteristics of the monopole radiating element included in the dual band monopole array antenna device according to an embodiment of the present invention may be as shown in FIGS. 3 to 5.

Specifically, the input reflection loss characteristics of the monopole radiating element are 20.0 dB or more in the GPS L2 band (existing in the first operating band) and 16.0 in the GPS L1 and Glonass bands (existing in the second operating band) as shown in FIG. It can have excellent performance over dB. In addition, the input reflection loss characteristic of the monopole radiating element can be expressed in the form of a Smith chart as shown in FIG. 4.

In addition, the isolation characteristics between the input terminals of the dual-band monopole array antenna device are 10.0 dB or more in the GPS L2 band (existing in the first operating band) and the GPS L1 and Glonass band (existing in the second operating band), as shown in FIG. ) Can show more than 12.0 dB performance.

The radiation pattern of the dual band monopole array antenna device shown in FIG. 2 may be different depending on the operating frequency. According to FIGS. 6 to 8 showing an example of a radiation pattern for each operating frequency, radiation patterns in an azimuth direction may be distorted a lot as an interferer of adjacent radiation elements, thereby showing a ripple characteristic.

6 is a radiation pattern when the operating frequency f is 1.227 GHz. In this case, the characteristics of the two-dimensional radiation pattern 610 in the azimuth direction and the two-dimensional radiation pattern 620 in the elevation direction at each input terminal may be as shown in Table 3.

Item Input terminal Simulated property values Antenna gain characteristics
@ Direction (direction of anti-explosion test) Input terminal 1 -0.2 dBi Input terminal 2 0.0 dBi Input terminal 3 2.0 dBi Input terminal 4 0.0 dBi Input terminal 5 -0.2 dBi 3 dB beam width characteristic
(Azimuth angle / elevation angle) Input terminal 1 262.2 ^o / 87.4 ^o Input terminal 2 81.8 ^o / 87.3 ^o Input terminal 3 58.6 ^o / 87.2 ^o Input terminal 4 81.8 ^o / 87.3 ^o Input terminal 5 262.2 ^o / 87.0 ^o

7 is a radiation pattern when the operating frequency f is 1.575 GHz. In this case, the characteristics of the two-dimensional radiation pattern 710 in the azimuth direction and the two-dimensional radiation pattern 720 in the elevation direction at each input terminal may be as shown in Table 4.

Item Input terminal Simulated property values Antenna gain characteristics
@ Direction (direction of anti-explosion test) Input terminal 1 0.6 dBi Input terminal 2 1.9 dBi Input terminal 3 0.7 dBi Input terminal 4 1.9 dBi Input terminal 5 0.6 dBi 3 dB beam width characteristic
(Azimuth angle / elevation angle) Input terminal 1 270.1 ^o / 86.9 ^o Input terminal 2 79.2 ^o / 86.7 ^o Input terminal 3 88.3 ^o / 86.3 ^o Input terminal 4 79.2 ^o / 86.7 ^o Input terminal 5 270.1 ^o / 86.9 ^o

8 may be a radiation pattern when the operating frequency f is 1.602 GHz. In this case, the characteristics of the two-dimensional radiation pattern 810 in the azimuth direction and the two-dimensional radiation pattern 820 in the elevation direction at each input terminal may be as shown in Table 5.

Item Input terminal Simulated property values Antenna gain characteristics
@ Direction (direction of anti-explosion test) Input terminal 1 0.9 dBi Input terminal 2 2.4 dBi Input terminal 3 1.1 dBi Input terminal 4 2.4 dBi Input terminal 5 0.9 dBi 3 dB beam width characteristic
(Azimuth angle / elevation angle) Input terminal 1 120.4 ^o / 86.8 ^o Input terminal 2 86.4 ^o / 86.5 ^o Input terminal 3 85.9 ^o / 86.1 ^o Input terminal 4 86.4 ^o / 86.5 ^o Input terminal 5 120.4 ^o / 86.8 ^o

The present invention provides a dual-band monopole antenna having a smaller size compared to a conventional antenna device by forming the first branch line 130 and the second branch line 140 operating in different frequency bands on the dielectric substrate 120 can do.

In addition, the present invention is a printed structure by manufacturing a radiating element in which the first branch line 130 and the second branch line 140 operating in different frequency bands are formed, thereby reducing the size and weight of the antenna device. It can be used as an array antenna device for direction detection for mounting a small unmanned aerial vehicle to find a jamming signal source.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiment, or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. -A hardware device specially configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of the program instructions include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operation of the embodiment, and vice versa.

The software may include a computer program, code, instructions, or a combination of one or more of these, configuring the processing unit to behave as desired or processed independently or collectively. You can command the device. Software and/or data may be interpreted by a processing device or to provide instructions or data to a processing device, of any type of machine, component, physical device, virtual equipment, computer storage medium or device. , Or may be permanently or temporarily embodyed in a transmitted signal wave. The software may be distributed over networked computer systems and stored or executed in a distributed manner. Software and data may be stored on one or more computer-readable recording media.

As described above, although the embodiments have been described by the limited drawings, a person of ordinary skill in the art can apply various technical modifications and variations based on the above. For example, the described techniques are performed in a different order from the described method, and/or components such as a system, structure, device, circuit, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved.

Therefore, other implementations, other embodiments and claims and equivalents fall within the scope of the following claims.

110: ground plane
120: dielectric substrate
130: first branch track
140: second branch track
150: stub track

Claims (1)

A monopole formed with a plurality of branch lines, and
Dielectric substrate on which monopole elements are printed
It includes a monopole radiating element consisting of,
The monopole,
A first branch line disposed at the center of the monopole element and operating in a first frequency band; And
A dual-band monopole antenna disposed outside the first branch line and including a plurality of second branch lines operating in a second frequency band.

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