KR101630674B1 - Double dipole quasi-yagi antenna using stepped slotline structure - Google Patents

Double dipole quasi-yagi antenna using stepped slotline structure Download PDF

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KR101630674B1
KR101630674B1 KR1020150124619A KR20150124619A KR101630674B1 KR 101630674 B1 KR101630674 B1 KR 101630674B1 KR 1020150124619 A KR1020150124619 A KR 1020150124619A KR 20150124619 A KR20150124619 A KR 20150124619A KR 101630674 B1 KR101630674 B1 KR 101630674B1
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strip
dipole
antenna
line
substrate
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KR1020150124619A
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Korean (ko)
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여준호
이종익
박진택
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동서대학교산학협력단
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/02—Details
    • H01Q19/04—Means for collapsing H-antennas or Yagi antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/28—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements
    • H01Q19/30—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements the primary active element being centre-fed and substantially straight, e.g. Yagi antenna

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Abstract

According to the present invention, a double dipole quasi-yagi antenna using a slot track structure with different widths increases a bandwidth of an antenna, and increases an antenna gain in a high frequency band. According to the present invention, the double dipole quasi-yagi antenna using a slot track structure with different widths comprises: a substrate (10) composed of a dielectric; a ground surface reflector (20) printed in a lower part in a front surface of the substrate (10); a first strip (30a) printed in the front surface of the substrate (10); a second strip dipole (30b) printed in the front surface of the substrate (10); a coplanar strip track (50) composed of a first CPS unit (50a) for connecting the ground surface reflector (20) and the first strip dipole (30a), and a second CPS unit (50b) for connecting the first strip dipole (30a) and the second strip dipole (30b); and a micro strip track (60) connected to the coplanar strip track (50), and suddenly changing to the coplanar strip track (50) since a terminal is disconnected.

Description

[0001] The present invention relates to a double dipole quasi-yagi antenna using a slot line structure having different widths,

The present invention relates to a double dipole semi-conductor antenna using a slot line structure having different widths, more specifically, to an antenna having a large bandwidth, an antenna gain at a high frequency band, And a wideband high gain antenna supporting a wireless service such as WiBro, WLAN, Blutooth, WiMAX and the like in various mobile communication systems such as PCS, IMT-2000, LTE and LTE- A dipole quasi-antenna using a slot line structure having different widths that can be effectively applied to a base station antenna.

As wireless communication technologies and services are developed, large-capacity high-speed data processing is required, and a broadband directional antenna design technique with stable gain and low backward radiation is required (Non-Patent Document 1). Various types of planar semi-conductor antennas have been widely used in microwave and millimeter wave applications due to their simple structure, wide band, proper gain, high front-to-back ratio, small cross polarization, and ease of fabrication (Non-Patent Document 2).

Several methods have been developed to increase the bandwidth of a plane quasi-antenna. A quasi-antenna having a balun connecting a microstrip (MS) line as a feeder line and a coplanar strip (CPS) line has been proposed, but a phase delay line The bandwidth is limited and the bandwidth of the antenna is narrow (Non-Patent Document 3). A quasi-antenna that directly connects an MS line and a coplanar waveguide (CPW) line has a relatively wide bandwidth, but has a disadvantage in that the radiation pattern is not symmetrical due to the asymmetry of the balun (Non Patent Document 4). Recently, a method of widening bandwidth by using a double dipole instead of a single dipole has been proposed (Non-Patent Document 5). However, the size of the ground plane used as the reflector is too large.

 L. Ge and K. M. Luk, " A wideband magneto-electric dipole antenna, " IEEE Trans. Antennas Propag., Vol. 60, no. 11, pp. 4987-4991, Nov. 2012.  R. Waterhouse, Printed antennas for wireless communications, John Wiley & Sons Ltd., England, 2007.  W. R. Deal, N. Kaneda, J. Sor, Y. Qian, and T. Itoh, "A new quasi-Yagi antenna for planar active antenna arrays," IEEE Trans.Microw. Theory Tech., Vol. 48, no. 6, pp. 910? 918, Jun. 2000.  H. K. Kan, R. B. Waterhouse, A. M. Abbosh, and M. E. Bialkowski, "Simple broadband planar CPW-fed quasi-Yagi antenna," IEEE Antennas Wireless Propag. Lett., Vol. 6, pp. 18? 20, 2007.   A. A. Eldek, " Design of double dipole antenna with enhanced usable bandwidth for wideband phased array applications, " Progress In Electromagnetics Research, vol. 59, pp. 1? 15, 2006.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is therefore an object of the present invention to provide a first strip dipole and a second strip dipole which are spaced apart from each other and a first strip dipole and a ground plane reflector, The present invention provides a dual dipole quasi-linear antenna using a slot line structure of a new type having a different width to increase the bandwidth of a plane quasi-antenna by forming a slot line and a second slot line.

In addition, the present invention provides a novel dipole quasi-antenna using a slot line structure of a different width, in which a first strip waveguide and a second strip waveguide are spaced apart from each other on an upper side of a second strip dipole, And to provide the above-mentioned objects.

The present invention uses a built-in balun composed of a coplanar strip line and a microstrip line to minimize the size of the ground plane while providing a new type of width that can improve the input impedance matching in the 50? And to provide a double dipole semi-conductor antenna using a slot line structure.

According to an aspect of the present invention, there is provided a plasma display panel comprising: a substrate made of a dielectric; A ground plane reflector 20 printed on the bottom front of the substrate 10; A first strip dipole 30a disposed on the top of the ground plane reflector 20 and printed on the front surface of the substrate 10; A second strip dipole 30b spaced above the first strip dipole 30a and printed on the entire surface of the substrate 10; A first CPPS unit 50a connecting the ground plane reflector 20 and the first strip dipole 30a and a second CPPS unit 50b connecting the first strip dipole 30a and the second strip dipole 30b A coplanar strip line 50; And a microstrip line (60) connected to the coplanar strip line (50) and having a short-circuited end and feeding the coplanar strip line (50) And a first slot line 51a and a second slot line 51b having different widths are formed in the second capacitor unit 50b. The dual dipole quasi-linear antenna using the slot line structure having different widths is provided.

The first slot line 51a of the first CPS unit 50a is connected to the second slot line 51b of the second DCS unit 50b in the dual dipole quasi-antenna using the different slot line structure according to the present invention. It is possible to have a small width.

The first strip dipole 30a and the second strip dipole 30b may have different lengths in the double dipole semi-conductor antenna using the slot line structure having different widths according to the present invention.

The double dipole semi-conductor antenna using the slot line structure having different widths according to the present invention includes a first strip waveguide 40a disposed on the upper side of the second strip dipole 30b and printed on the entire surface of the substrate 10; And a second strip waveguide 40b disposed above the first strip waveguide 40a and printed on the entire surface of the substrate 10. [

According to the dual dipole quasi-antenna using the slot line structure having different widths according to the present invention, it is possible to increase the bandwidth of the plane quasi-antenna, increase the antenna gain in the high frequency band, and improve the input impedance matching in the wide antenna band . Accordingly, the dual dipole quasi-antenna using the slot line structure according to the present invention can be applied to various mobile communication systems such as PCS, IMT-2000, LTE and LTE-A, and wireless services such as WiBro, WLAN, Blutooth and WiMAX And can be effectively applied to a wideband high gain base station antenna supporting the same.

1 (a) and 1 (b) are diagrams of a dual dipole quasi-static antenna using a slot line structure having different widths according to an embodiment of the present invention;
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a dual dipole quasi-static antenna, and more particularly,
FIGS. 3 to 9 illustrate experimental results for analyzing characteristics of a dual dipole quasi-static antenna using a slot line structure having different widths according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings 1 to 9. In the drawings and the detailed description, it is to be understood that a general antenna, a quasi-yagi antenna, a strip dipole, a ground reflector, a strip director, a dielectric, a substrate, a balun ), Coplanar strips (CPS: coplanar strips), microstrips (MSs), etc., are briefly omitted or omitted. In the drawings and specification, there are shown in the drawings and will not be described in detail, and only the technical features related to the present invention are shown or described only briefly. Respectively.

1 (a) and 1 (b) are diagrams of a dual dipole quasi-static antenna using slot line structures of different widths according to an embodiment of the present invention.

Referring to FIG. 1, a dual dipole quasi-antenna 100 using a slot line structure having different widths according to an embodiment of the present invention includes a substrate 10, a ground plane reflector 20, a first strip dipole 30a, A first strip waveguide 40a, and a second strip waveguide 40b. The first strip waveguide 40b and the second strip dipole 30b are connected to each other at a frequency of 1.60 GHz To 3.60 GHz and has an antenna gain of 6 dBi or more.

The substrate 10 according to the embodiment of the present invention includes a ground plane reflector 20, a first strip dipole 30a, a second strip dipole 30b, a coplanar strip line 50, a first strip waveguide 40a, and a second strip waveguide 40b are printed on the surface.

The ground plane reflector 20 is printed on the lower front of the substrate 10.

The first strip dipole 30a is spaced on the ground plane reflector 20 and printed on the front surface of the substrate 10 while the second strip dipole 30b is spaced above the first strip dipole 30a, 10) is printed on the front side. The first strip dipole 30a and the second strip dipole 30b according to the embodiment of the present invention are formed to have different lengths. The first strip dipole 30a located at the lower side is connected to the second strip dipole (L 1 > l 2 ).

The coplanar strip line 50 includes a first CPPS unit 50a connecting the ground plane reflector 20 and the first strip dipole 30a and a second CPPS unit 50b connecting the first strip dipole 30a and the second strip dipole 30b And a secondCPS unit 50b. The coplanar strip line 50 is formed such that first and second slot lines 51a and 51b having different widths are formed in the first and secondCPS units 50a and 50b. Particularly, the coplanar strip line 50 according to the embodiment of the present invention has a structure in which the first slot line 51a of the firstCPS unit 50a has a width w smaller than the second slot line 51b of the secondCPS unit 50b s1 < w s2 ). This increases antenna bandwidth.

The micro strip line 60 is connected to the coplanar strip line 50 and is terminated short-circuited to feed the coplanar strip line 50. The microstrip line 60 includes a ground plane reflector 20, a first strip dipole 30a, a second strip dipole 30b, a coplanar strip line 50, a first strip waveguide 40a, A waveguide 40b is formed on the backside opposite the surface of the printed substrate 10. And is connected to a portion of the coplanar strip line 50 on the surface of the substrate 10 using a shorting pin to short-circuit the termination of the microstrip line 60. By adjusting the length of the microstrip line 60, that is, the position of the feeding point, the microstrip line 60 having the characteristic impedance of 50? The microstrip line 60 in which the short circuit is terminated and the slot line of the coplanar strip line 50 constitute a built-in balun.

The first strip waveguide 40a is disposed on the upper side of the second strip dipole 30b and printed on the front side of the substrate 10 and the second strip waveguide 40b is disposed on the upper side of the first strip waveguide 40a And is printed on the front surface of the substrate 10. The antenna gain is increased in the high frequency band through the first strip waveguide 40a and the second strip waveguide 40b.

FIG. 2 is a view showing a design structure of a double dipole semi-conductor antenna using a slot line structure having a different width according to an embodiment of the present invention.

2 , the length of the first strip dipole D 1 and the length of the second strip dipole D 2 in the double dipole quasi-antenna 100 using the slot line structure of different widths according to the embodiment of the present invention, width l 1, w 1, l 2, w 2, and the first distance between the strip dipole and the ground plane reflector (R 0) distance from the first strip dipole and a second strip dipoles between each s 1 and s each 2 . The length and width of the ground plane reflector are l g and w g, respectively. A first slot line and the distance x is f, a ground length of the microstrip line from the surface to the feed point of the reflector to the center of the microstrip line from the center of the second slot line is y f. The width of the coplanar strip line is w cps . The width of the first slot line in the coplanar strip line connecting the ground plane reflector and the first strip dipole is ws1 and the width of the second slot line in the coplanar strip line connecting the first strip dipole and the second strip dipole Is w s2 . The first is the length and width of the strip waveguide (D r1) are each l d1, w d1, and the length and width of the second strip waveguide (D r2) is l d2, w d2, respectively. The distance between the second strip dipole and the first strip waveguide is d s1, and the distance between the first strip waveguide and the second strip waveguide is d s2 . The substrate used for antenna design is FR4 substrate (thickness = 1.6 mm, loss tangent = 0.025).

The design parameters of the final antenna designed with a gain of more than 6dBi in the 1.60 ~ 3.60 GHz band are as follows.

[l 1 = 72 mm, l 2 = 61.2 mm, l g = 90 mm, s 1 = 36 mm, s 2 = 32.4 mm, w cps = 20 mm, w g = 15 mm, w 1 = w 2 = 7.5 mm, w f = 3 mm, w s1 = 0.7 mm, w s2 = 6.7 mm, d s1 = 8 mm, l d1 = 24 mm, w d1 = 10 mm, d s2 = 12 mm, l d2 = 24 mm, W d2 = 5 mm, L = 90 mm, W = 140 mm, x f = 5 mm, h = 1.6 mm, y f = 23 mm]

FIGS. 3 to 9 illustrate experimental results for analyzing characteristics of a dual dipole quasi-static antenna using a slot line structure having different widths according to an embodiment of the present invention. Here, the characteristics of the dual dipole quasi-antenna 100 are analyzed using Microwave Studio (MWS) of CST, a commercial electromagnetic problem analysis tool.

FIG. 3 shows five antenna structures with performance comparison to explain the antenna design procedure, and the input impedance, VSWR, and gain characteristics in the broadside direction (+ y direction) of these antenna structures are shown in FIG.

A reference double dipole quasi-antenna having a first slot line and a second slot line having the same width and having no ground plane waveguide is shown in FIG. 3A. In this case, w s1 = w s2 = 0.7 mm, s 1 = s 2 = 36 mm and l 2 = 54 mm. The length ratio of the second strip dipole to the first strip dipole is l 2 / l 1 = 0.7. From Fig. 4, it can be seen that the bandwidth of VSWR < 2 is 1.66 to 2.76 GHz (49.8%) and the gain is 4.5 to 6.2 dBi in the band. The input resistance in the band is 46 to 97 Ω, and the input reactance is 39 Ω at -18 Ω.

Next, a slot line having a different width is applied as shown in FIG. 3 (b). Figure 5 shows the change in the input VSWR and broadside gain characteristics when w s1 = 0.7 mm and w s2 is increased from 0.7 mm to 8.7 mm. As w s2 increases to 6.7 mm, the upper and lower frequencies of the frequency band with VSWR <2 increase and the bandwidth increases. When w s2 is increased to 8.7 mm, the frequency bandwidth increases but the impedance matching deteriorates in the 3.70 to 3.94 GHz band. Therefore, w s2 = 6.7 mm was determined for wideband impedance matching. In this case, the impedance matching in the 2.70 ~ 4.30 GHz band is improved and the VSWR < 2 band is greatly increased to 1.60 ~ 4.30 GHz (91.5%) as compared with the antenna structure of FIG. The input resistance in the band is 25 to 90 Ω, and the input reactance is 16 Ω at -36 Ω. However, it can be seen that the gain varies from 6.5 dBi to -5.1 dB in the band, and the gain is low in the high frequency band as compared with the antenna structure of FIG. 3 (a). In addition, the gain value of 6 dBi or less at the frequency of 1.8 GHz or more does not satisfy the design requirement.

A first strip waveguide and a second strip waveguide were added as shown in Fig. 3 (c) to increase the gain at frequencies above 1.8 GHz. The design parameters associated with the added first strip waveguide and the second strip waveguide are as follows.

[d s1 = 8 mm, l d1 = 24 mm, w d1 = 10 mm, d s2 = 12 mm, l d2 = 24 mm, w d2 = 5 mm]

When only the first strip waveguide is added in FIG. 3 (b), the bandwidth of VSWR <2 is 1.60 to 3.52 GHz (75.0%) and the gain is 3.9 to 6.5 dBi in the band. However, a second strip waveguide is needed because the frequency band does not meet the desired 1.60 to 3.60 GHz band and the gain is still less than 6 dBi at frequencies above 1.8 GHz.

When a second strip waveguide is added, the VSWR < 2 band increases from 1.60 to 3.60 GHz (76.9%) and the gain in the band is 5.1 to 6.5 dBi. The input resistance in the band is 33 to 77Ω, and the input reactance is 39Ω at -35Ω. However, gain is improved at frequencies above 1.8 GHz, but gain needs to be improved to below 6 dBi in the 1.80 ~ 2.54 GHz band and the 3.19 ~ 3.60 GHz band.

It is well known that as the length of the second strip dipole of the dual dipole semi-conductor antenna increases, the frequency band shifts to a lower frequency and the gain increases in a lower frequency band. Using this fact, the length of the second strip dipole is increased to l 2 = 61.2 mm as shown in FIG. 3 (d) in order to increase the gain in the low frequency band. Here, the length ratio of the second strip dipole to the first strip dipole is l 2 / l 1 = 0.85. As can be seen from FIG. 4, the bandwidth of VSWR <2 slightly increased from 1.58 to 3.60 GHz (78.0%). The gain in the band is 5.7 to 7.3 dBi and the gain in the low frequency band is more than 6 dBi. However, the gain in the 3.18 to 3.60 GHz band is still below 6 dBi.

Finally, to improve the gain in the high frequency band, the length of the coplanar strip line connecting the first strip dipole and the second strip dipole was slightly reduced to s 2 = 32.4 mm. The bandwidth of VSWR <2 moves from 1.60 to 3.63 GHz (77.6%) at a slightly higher frequency and the bandwidth is reduced, but it satisfies the desired band of 1.60 to 3.60 GHz. Also, the gain in the 1.60 to 3.60 GHz band is 6.2 dB to 7.3 dBi, which is more than 6 dBi.

The simulated surface current distribution at 1.6 GHz and 3.6 GHz for the proposed dual dipole quasi-antenna is shown in Fig. At 1.6 GHz, the current is strongly distributed in the first strip dipole and weakly distributed in the first strip waveguide and the second strip waveguide. On the other hand, at 3.6 GHz, the current distribution in the first strip waveguide and the second strip waveguide is strong, which means that the waveguide operates effectively in the high frequency band.

In order to verify the optimized simulation results according to the above-described design procedure, a double dipole quasi-static antenna was fabricated as shown in FIG. 7 using an FR4 substrate. The size of the fabricated dual dipole quasi - magnetic antenna was 90mm (L) × 140mm (W), and it was fed to SMA connector.

The input VSWR and gain of the fabricated dual dipole quasi - antenna were measured using a network analyzer (Agilent N5230A). Figure 8 shows the measured input VSWR and gain. As shown in FIG. 8 (a), the bandwidth of VSWR <2 is 1.60 ~ 3.63 GHz (77.6%) and the measurement result is 1.59 ~ 3.64 GHz (78.4%). The gain of the fabricated antenna is shown in Fig. 8 (b). The gain is the broadside gain measured in the anechoic chamber and the measurement gain is 6.4 ~ 7.4 dBi in the 1.60 ~ 3.60 GHz band, slightly larger than the simulation results.

FIG. 9 shows measurement results of E-plane (xy plane) and H-plane (yz plane) radiation patterns of antennas fabricated at 1.6 GHz, 2.5 GHz, and 3.6 GHz, respectively. Also, it can be seen that the front / rear ratio is better than 10 dB in the 1.60 ~ 3.60 GHz band.

It can be seen that the double dipole semi-array antenna fabricated as described above satisfies a desired design requirement with a gain of 6.4 to 7.4 dBi in a band of 1.59 to 3.64 GHz and a bandwidth of 1.60 to 3.60 GHz in a VSWR <2 band. Also, the measured front / rear ratio was better than 10dB.

The duplex dipole antenna 100 using the slot line structure having different widths according to the embodiment of the present invention includes a first strip dipole 30a and a second strip dipole 30b spaced apart from each other, The first slot line 51a and the second slot line 51b having different widths are formed on the coplanar strip line 50 connecting the dipole 30a and the ground plane reflector 20, ) Is increased. The duplex dipole antenna 100 using a slot line structure having different widths according to an embodiment of the present invention includes a first strip waveguide 40a and a second strip waveguide 40b on the second strip dipole 30b. Are spaced apart from each other so that the antenna gain is increased in the high frequency band. The dual dipole quasi-antenna 100 using the slot line structure having different widths according to the embodiment of the present invention uses a built-in balun composed of the coplanar strip line 50 and the microstrip line 60, Minimize surface size and improve input impedance matching in 50 Ω MS feeder lines and wide antenna bands.

Although the dual dipole semi-conductor antenna using the slot line structure having different widths according to the embodiment of the present invention has been described with reference to the above description and drawings, the present invention is merely illustrative and is not to be construed as limiting the technical idea of the present invention It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention.

10: substrate 20: ground plane reflector
30a: first strip dipole 30b: second strip dipole
40a: first strip waveguide 40b: second strip waveguide
50: coplanar strip line 50a: first CPPS unit
50b: secondCPS unit 51a: first slot line
51b: second slot line 60: microstrip line
100: double dipole quasi-antenna

Claims (4)

A substrate 10 made of a dielectric;
A ground plane reflector 20 printed on the bottom front of the substrate 10;
A first strip dipole 30a disposed on the top of the ground plane reflector 20 and printed on the front surface of the substrate 10;
A second strip dipole 30b spaced above the first strip dipole 30a and printed on the entire surface of the substrate 10;
A first CPPS unit 50a connecting the ground plane reflector 20 and the first strip dipole 30a and a second CPPS unit 50b connecting the first strip dipole 30a and the second strip dipole 30b A coplanar strip line 50;
And a microstrip line (60) connected to the coplanar strip line (50) and having a short-circuited end to feed the coplanar strip line (50)
Wherein a first slot line (51a) and a second slot line (51b) having different widths are formed in the first and second PCB units (50a, 50b) of the coplanar strip line (50) A Double Dipole Semi - Antenna Antenna Using Slot Line Structure. The method according to claim 1,
The first slot line 51a of the firstCPS unit 50a has a smaller width than the second slot line 51b of the secondCPS unit 50b. Yagi antenna. The method according to claim 1,
Wherein the first strip dipole (30a) and the second strip dipole (30b) are formed to have different lengths. The method according to claim 1,
A first strip waveguide 40a disposed on the upper side of the second strip dipole 30b and printed on the front surface of the substrate 10;
And a second strip waveguide (40b) arranged on the first strip waveguide (40a) and printed on the entire surface of the substrate (10).
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KR101829816B1 (en) * 2016-11-22 2018-02-19 대구대학교 산학협력단 Tri-band Double-dipole quasi-Yagi antenna using Dual Co-directional SRRs
US10256549B2 (en) 2017-04-03 2019-04-09 King Fahd University Of Petroleum And Minerals Compact size, low profile, dual wideband, quasi-yagi, multiple-input multiple-output antenna system
CN108847534A (en) * 2018-05-25 2018-11-20 哈尔滨工程大学 A kind of multi-resonant minor matters antenna
CN109301461A (en) * 2018-11-22 2019-02-01 湖南华诺星空电子技术有限公司 A kind of miniature ultra wide band plane yagi aerial
CN109301461B (en) * 2018-11-22 2024-03-08 华诺星空技术股份有限公司 Miniaturized ultra-wideband planar yagi antenna
CN114006157A (en) * 2021-10-27 2022-02-01 东南大学 Planar quasi-yagi antenna based on substrate integrated waveguide and tapered gradient structure feed
CN114006157B (en) * 2021-10-27 2024-02-06 东南大学 Planar quasi-yagi antenna based on substrate integrated waveguide and tapered gradient structure feed

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