10-2.xlsZhe-Chen Su1,*, Chu-Yu Chen2,*
1,2 Department of Electrical Engineering , National University of Tainan, Tainan, 70005,
Taiwan
Abstract
In this paper, a 77GHz series-type microstrip antenna array for automotive
radar applications is designed and simulated. The liquid crystal polymer film with stable
dielectric constant and low loss tangent at the mm-wave range is used for this purpose.
Based on the transmission line model, the parameters related the designed antenna array
can be analyzed and figured out. To meet the requirements of high gain and broad
bandwidth, the microstrip corporate matching network is implemented and connected
with those series microstrip patch antenna array. To improve the ambiguity
characterization of antenna array, the difference between the main lobe and the side lobe
in the 2-D radiation pattern is expected to be larger than 10 dB. Different techniques are
adopted to realize this goal. The inset feeding can increase 0.44 dB compared to the
conventional edge feeding. Then, the difference of 11.6 dB can be obtained by adjusting
the width of patch. Finally, it is shown that the antenna gain of 17.25 dBi and wide
bandwidth of about 6.5 GHz (75.42GHz ~ 81 GHz) are achieved.
Keywords: Automotive Radar; Millimeter-Wave; Liquid Crystal Polymer film; Microstrip
Patch Antenna; Antenna array ; Series-feeding; microstrip corporate matching network; Inset
feeding
International Journal of Science and Engineering (issued by NUTN) Vol.10 No.2(2020):81-91 81
------------------------------------------ * Corresponding author:m10582015@stumail.nutn.edu.tw/cychen57@mail.nutn.edu.tw DOI10.3966/222344892020101002007
75.42

11.6dbi


82 77GHz
1.
24 GHz
[2]



[10];

3.16 110GHz 0.002~0.005
0.04%

International Journal of Science and Engineering (issued by NUTN) 83
=
√
+ . )
+ . ) ()
h
2 N

λ/2 (8)
Za=Zb=50ΩZ1=Z2=Z3=Z4=50Ω
Zq 1 λ/4(8)Zq
1 = Zq 2 = Zq
Zq 1
International Journal of Science and Engineering (issued by NUTN) 85
2.1
y0


Zq 1R
y0=0.23mm
6
W= 1.554 mm, L = 1.18 mm, w= 0.109 mm, l= 1.389 mm, x1= 0.676
mm, x2 = 0.08 mm, x3 = 0.676 mm, x4 = 0.286 mm, y1= 0.286 mm, y2 = 6.171 mm, y3 =
0.286 mm, y4 = 3.052 mm, δ = 0.003 0.1mm
8.73 mm × 9.05mm
7 S11 8 θ 0
75.39 ~82.5 GHz dbi 17.05dbi 8.15dbi
8.9db 10di

International Journal of Science and Engineering (issued by NUTN) 87
3.2
10 11
S11 θ 0
75.42 ~81 GHz
17.01dbi 7.67dbi
9.34db 10db
88 77GHz
3.3
12 75.42 ~81GHz 13

Wm/W=1.2, Ws/W=0.9 12.36db-90°
-45° 14 3D
International Journal of Science and Engineering (issued by NUTN) 89
14 Wm/W=1.15, Ws/W=0.925 3D
4.
75.42GHz 81GHz 17.25dB

5.
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92 77GHz