KR101636494B1 - A microstrip antenna stacked with λ/4 parasitic elements - Google Patents

A microstrip antenna stacked with λ/4 parasitic elements Download PDF

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Publication number
KR101636494B1
KR101636494B1 KR1020150048429A KR20150048429A KR101636494B1 KR 101636494 B1 KR101636494 B1 KR 101636494B1 KR 1020150048429 A KR1020150048429 A KR 1020150048429A KR 20150048429 A KR20150048429 A KR 20150048429A KR 101636494 B1 KR101636494 B1 KR 101636494B1
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KR
South Korea
Prior art keywords
patch
microstrip antenna
rti
powered
band
Prior art date
Application number
KR1020150048429A
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Korean (ko)
Inventor
우종명
김준원
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국방과학연구소
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Priority to KR1020150048429A priority Critical patent/KR101636494B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole

Abstract

The multilayered multi-band microstrip antenna according to the present invention includes a ground plane 100 for performing a grounding function, a rectangular patch 200 having one diagonal line partially cut on the ground plane 100, a patch 200 300 / 300-3,300-4) of the inverted L-shaped model stacked on the antenna 300 and a coaxial probe connected to the feed point 400 for feeding the designed antenna, / 4 The parasitic element is a microstrip patch antenna and coupling, which realizes the advantage of maintaining the characteristics of multi-band characteristics such as GPS L 1 (1.575 GHz) and L 2 (1.227 GHz) band.

Description

[0001] The present invention relates to a laminated multi-band microstrip antenna,

Field of the Invention [0002] The present invention relates to a microstrip patch antenna, and more particularly to a laminated multi-band microstrip antenna of a? / 4 non-powered element.

The microstrip patch antenna is an antenna generally used for receiving GPS (Global Positioning System). This is because it is advantageous to mount on a mobile body or a vehicle with a low profile, high gain and broadside radiation pattern.

On the other hand, since GPS is used in three bands for civil and military purposes, there is a limitation that all GPS signals can not be received using one microstrip patch antenna.

As a result, studies of multi-band microstrip antennas have been carried out in various ways. Thus, a technique for multi-banding using a microstrip patch antenna has been developed, as in the case of non-patent prior arts 1,

1. Deshmukh, A. A., Ray, K. P.: 'Multi-band configurations of stub-loaded slotted rectangular microstrip antennas,' IEEE Antennas Propag. Mag., Feb. 2010, 52 (1), pp. 89-103. 2. Kim, J.-W., Jung T.-H., Ryu, H.-K., Woo, J.-M., Eun, C.-S., Lee, D.-K., Compact multiband microstrip antenna using inverted-L- and T-shaped parasitic elements', IEEE Antennas and Wireless Propag. Sep. 2013, 12, pp. 1299-1302. 3. Liu, D., Miao, J., Zhao, X., 'A triple-band circular polarization stacked microstrip antenna', 2007 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, Aug. 2007, pp.559-562.

However, the limitations of each of the above non-patent documents 1, 2, and 3 are as follows.

In the non-patent prior art document 1, a stub and a slit are used for a multiband microstrip antenna, thereby increasing a size of an antenna by mounting a stub, and generating a harmonic component by changing a current distribution by using a slit.

In the non-patent prior art document 2, since parasitic elements are mounted on the radiation opening surface for the multi-band microstrip antenna, the bandwidth of the antenna is limited and the gain of the cross polarization is increased.

In the non-patent prior art document 3, multiple bands are formed by stacking patch antennas for a microstrip antenna, thereby heightening the height of the antenna.

The present invention considering the point as described above is λ / 4 non-powered element (GPS L 1 band) is a microstrip patch antenna (GPS L 2 bands) and the coupling being λ which can maintain characteristics of the low profile with the multi-band characteristics / 4 < / RTI > stacked multi-band microstrip antenna.

The λ / 4 non-powered element stacked multi-band microstrip antenna of the invention for achieving the above object, a ground plane for performing a ground feature, a patch of the grounded side one diagonal some incision over the square shape (GPS L 2 Band), lambda / 4 parasitic elements (GPS L 1 band) of an inverted L-shaped model stacked on the patch, and a coaxial probe capable of feeding the designed antenna.

In the present invention, the coupling between the antenna patch and the non-powered device is performed by laminating the lambda / 4 parasitic element above the microstrip patch antenna, and the GPS L 1 (1.575 GHz), L 2 And the like, and at the same time maintains the characteristics of the low-pass filter.

FIG. 1 is a view showing a structure of a laminated multi-band microstrip antenna according to the present invention, FIG. 2 is a diagram illustrating a component size ratio of a laminated multi-band microstrip antenna according to the present invention, 4 is a schematic view showing a simulation of a lambda / 4 non-powered element-stacked multi-band microstrip antenna according to the present invention and a measured reflection FIG. 5 is a view showing an example of a simulation and a measured axial ratio characteristic of the laminated multi-band microstrip antenna according to the present invention, and FIG. FIG. 1 is a diagram illustrating simulation and measured radiation pattern characteristics of a laminated multi-band microstrip antenna according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

Fig. 1 shows the construction of a lambda / 4 parasitic element laminated multi-band microstrip antenna according to this embodiment. As shown, the multiband microstrip antenna includes a ground plane 100, a patch 200, a non-powered element 300, and a feeding point 400.

Specifically, the ground plane 100 performs a grounding function and is made of a metal material. The face of the ground plane (100) places the patch (200).

Specifically, the patch 200 is made of a metal and has a square shape having upper and lower cut edges 200-1 and 200-2, which are formed by partially cutting both diagonal ends of four corners on the patch radiating aperture. The patch 200 is positioned above the face of the ground plane 100 and the patch radiating opening face of the patch 200 positions the non-powered element 300.

Specifically, the non-powered element 300 is made of a metal material, has an inverted L-shaped model, and has a wavelength of? / 4. The non-powered element 300 is positioned at the patch radiating opening face of the patch 200 so that the electromagnetic field of the radiation opening of the patch 200 is coupled and resonated. The non-powered element 300 includes, for example, first and second top-notch power elements 300-1 and 300-2 occupying the upper portion of the patch radiation opening of the patch 200, And the third and fourth lower parasitic elements 300-3, 300-4 occupying the lower portion. Each of the first and second upper non-powered elements 300-1 and 300-2 and the third and fourth lower non-powered elements 300-3 and 300-4 forms an inverted L-shaped model, They are spaced from each other by four corners. The second upper non-powered element 300-2 forms an upper cut edge 300-2a so as to conform to the cut upper cut edge 200-1 of the patch 200, The non-powered element 300-4 forms a lower incision edge 300-4a so as to conform to the incised lower incision edge 200-2 of the patch 200.

Specifically, the feeding point 400 is formed between the third and fourth lower non-powered elements 300-3, 300-4 at the lower portion of the patch radiation opening of the patch 200. [ The feeding point 400 feeds an antenna designed by connecting a coaxial probe.

2 and 3 illustrate a ground plane 100 that enables the multilayered multi-band microstrip antenna of the lambda / 4 parasitic element to have multi-band characteristics such as GPS L 1 (1.575 GHz) and L 2 (1.227 GHz) And the size and arrangement characteristics of the patch 200 and the non-powered element 300.

Referring to the size characteristics of FIG. 2, the ground plane 100 has a rectangular shape with a vertical width H and a lateral width W equal to each other, and the patch 200 has a vertical width Lh and a horizontal width Lw Each of the first and second upper non-powered elements 300-1 and 300-2 and the third and fourth lower non-powered elements 300-3 and 300-4 has a vertical width lh and a lateral width lw It is the same square. Therefore, the ground plane 100, the patch 200, and the non-powered element 300 are similar in shape and square. The size ratio of the longitudinal width H of the ground plane 100 to the longitudinal width Lh of the patch 200 and the longitudinal width lh of the non-powered element 300 is 1: 0.34 to 0.35: 0.14, and the ratio of the width W of the ground plane 100 to the width Lw of the patch 200 and the width lw of the non-powered element 300 is 1: 0.34 to 0.35: 0.13 ~ 0.14. For example, when the longitudinal width H and the lateral width W of the ground plane 100 are respectively 300 mm, the vertical width Lh and the lateral width Lw of the patch 200 are respectively 104 mm, The vertical width lh and the horizontal width lw of the first substrate 300 are set to 40 mm, respectively.

3, the first and second upper non-powered elements 300-1 and 300-2 and the third and fourth lower non-powered elements 300-3 and 300-4, which constitute the non-powered element 300, Quot; X "symmetry with respect to the center O of the patch 200. [ For example, the first upper non-powered element 300-1 and the third lower non-powered element 300-3 are symmetrical with respect to the imaginary line AA connecting the center O of the patch 200 to 180 degrees And the second upper parasitic element 300-2 and the fourth lower parasitic element 300-4 are arranged symmetrically with respect to the imaginary line BB connecting the center O of the patch 200 to 180 degrees, Respectively. Therefore, the imaginary lines A-A and imaginary lines B-B form an "X" symmetry about the center O of the patch 200.

Meanwhile, FIG. 4 shows simulation and measured return loss characteristics. As shown, the return loss is in good agreement with the simulation and the measured -10dB bandwidth in the GPS L 1 (1.575GHz) and L 2 (1.227GHz) band is 120MHz (7.6%), 82.5MHz (6.7% ). It satisfies the system requirement bandwidth of GPS.

5 shows simulated and measured axial ratio characteristics. As shown, the axial ratio is well matched to the simulation and measurement, and the measured 3 dB axial ratio bandwidth of GPS L 1 (1.575 GHz) and L 2 (1.227 GHz) is 172 MHz (10.92%) and 25 MHz (2.03%) respectively Measured and met the GPS system required bandwidth.

Figure 6 also shows simulation and measured radiation pattern characteristics. As shown, the radiation pattern obtained a good broadside radiation pattern in all bands. Gain of the measurement antenna was measured in the GPS L in the x-axis of the polarization-1 (1.575GHz), and 2.1 dBi, 4.21 dBi in the y-axis polarization, GPS L 2 (1.227GHz) is 6.74 dBi, respectively, y-axis polarization in 8.0 dBi .

As described above, the lambda / 4 parasitic element multilayered multi-band microstrip antenna according to the present embodiment includes a ground plane 100 performing a grounding function, a square patch having one diagonal line partially cut on the ground plane 100, 300 / 300-3, 300-3, and 300-4 of inverted L-shaped models stacked on the patch 200, a coaxial feeder line 300 connected to the feed point 400 for feeding the designed antenna, coaxial probe), the λ / 4 parasitic element is coupled with a microstrip patch antenna to maintain multi-band characteristics such as GPS L 1 (1.575 GHz) and L 2 (1.227 GHz) .

100: ground plane 200: patch
200-1, 300-2, 300-2a, 300-4a: upper and lower incision corners
300: non-powered element 300-1,300-2: first and second non-powered elements
300-3,300-4: 3rd and 4th lower non-powered element
400: feeding point

Claims (9)

In a multi-band microstrip antenna for GPS L1, L2 band,
A ground plane performing a ground function;
A square patch having one diagonal end cut on the ground plane; And
An inverted L-shaped λ / 4 parasitic element;
/ RTI >
The non-powered element includes first and second upper parasitic elements occupying a portion above a patch radiation opening surface among four square edges of the patch and third and fourth upper parasitic elements occupying a portion below the patch radiation opening surface of the square four corners of the patch , And four lower non-powered elements, wherein the first and second upper and lower non-powered elements form an "X" symmetry about the center of the patch
/ 4 < / RTI > parasitic element stacked multi-band microstrip antenna.
[2] The apparatus according to claim 1,
Layered multi-band microstrip antenna.
The patch according to claim 1,
A multilayer multi-band microstrip antenna according to any of the preceding claims, characterized in that it is made of a metal and has one side of each side of the diagonal line partially cut.

The non-powered element according to claim 1,
A multilayer multi - band microstrip antenna with a λ / 4 parasitic element characterized by a λ / 4 parasitic element having a metal L - shaped inverted model.
5. The non-powered device according to claim 4,
/ RTI > laminated multi-band microstrip antenna according to claim < RTI ID = 0.0 > 1, < / RTI >
delete [3] The apparatus of claim 1, wherein the first and second lower parasitic elements and the third lower parasitic element are positioned at one corner of the patch and are symmetrical to each other, Wherein the first and second patches are arranged at the other edges of the patch and are arranged to be symmetrical to each other.
[8] The method of claim 7, wherein the second upper non-powered element forms an upper cutting edge so as to conform to an incised upper incision edge of the patch, the fourth lower non-powered element comprising an incised lower incision edge / RTI > laminated multi-band microstrip antenna according to claim < RTI ID = 0.0 > 1, < / RTI >
The laminated multi-band microstrip antenna according to claim 1, wherein the patch further comprises a feed point, and the feed point connects a coaxial feeder for feeding the antenna.
KR1020150048429A 2015-04-06 2015-04-06 A microstrip antenna stacked with λ/4 parasitic elements KR101636494B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012204916A (en) * 2011-03-24 2012-10-22 Panasonic Corp Double resonant type antenna device
KR101302580B1 (en) * 2013-04-01 2013-09-03 충남대학교산학협력단 Compact multi band microstrip antenna using inverted l shaped and t shaped parasitic elements

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012204916A (en) * 2011-03-24 2012-10-22 Panasonic Corp Double resonant type antenna device
KR101302580B1 (en) * 2013-04-01 2013-09-03 충남대학교산학협력단 Compact multi band microstrip antenna using inverted l shaped and t shaped parasitic elements

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
1. Deshmukh, A.A., Ray, K.P.: 'Multi-band configurations of stub-loaded slotted rectangular microstrip antennas,' IEEE Antennas Propag. Mag., Feb. 2010, 52(1), pp.89-103.
2. Kim, J.-W., Jung T.-H., Ryu, H.-K., Woo, J.-M., Eun, C.-S., Lee, D.-K.,'Compact multiband microstrip antenna using inverted-L- and T-shaped parasitic elements', IEEE Antennas and Wireless Propag. Sep. 2013, 12, pp.1299-1302.
3. Liu, D., Miao, J., Zhao, X., 'A triple-band circular polarization stacked microstrip antenna', 2007 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, Aug. 2007, pp.559-562.

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