SINTESA ANTENA SUSUN Prosiding.Seminar.Radar.Nasional.2008
Prosiding Seminar Radar Nasional 2008., Jakarta, 30 April 2008., ISSN : 1979-2921.
untuk melihat hubungan antara jumlah elemen dengan pola distribusi amplitudonya.
Tabel 1. Hasil perhitungan Sintesa Amplitudo 32 elemen
elemen Uniform Chebyshev Taylor Cosine UniformChebyshev Taylor Cosine
1 1
1.5261 0.5185 0.1442
1 0.8085
0.4042 0.1026 2
1 0.4383
0.5277 0.2322 1
0.3296 0.4156 0.1949
3 1
0.4952 0.5459 0.3189
1 0.3902
0.4381 0.2858 4
1 0.5524
0.5722 0.4036 1
0.4533 0.4707 0.3746
5 1
0.6092 0.6058 0.4853
1 0.5176
0.5122 0.4602 6
1 0.6648
0.6452 0.5633 1
0.5822 0.561
0.542 7
1 0.7185
0.689 0.6368
1 0.6459
0.6152 0.6191 8
1 0.7694
0.7355 0.7051 1
0.7076 0.6727 0.6908
9 1
0.8168 0.7829 0.7677
1 0.766
0.7314 0.7564 10
1 0.86
0.8295 0.8238 1
0.8201 0.789 0.8152
11 1
0.8984 0.8733 0.8729
1 0.8667
0.8432 0.8667 12
1 0.9314
0.9127 0.9146 1
0.9109 0.892 0.9104
13 1
0.9584 0.9462 0.9484
1 0.9458
0.9335 0.9459 14
1 0.979
0.9726 0.9741 1
0.9726 0.9661 0.9728
15 1
0.993 0.9907 0.9913
1 0.9908
0.9886 0.9909 16
1 1
1 1
1 1
1 1
17 1
1 1
1 1
1 1
1 18
1 0.993
0.9907 0.9913 1
0.9908 0.9886 0.9909
19 1
0.979 0.9726 0.9741
1 0.9726
0.9661 0.9728 20
1 0.9584
0.9462 0.9484 1
0.9458 0.9335 0.9459
21 1
0.9314 0.9127 0.9146
1 0.9109
0.892 0.9104 22
1 0.8984
0.8733 0.8729 1
0.8667 0.8432 0.8667
23 1
0.86 0.8295 0.8238
1 0.8201
0.789 0.8152 24
1 0.8168
0.7829 0.7677 1
0.766 0.7314 0.7564
25 1
0.7694 0.7355 0.7051
1 0.7076
0.6727 0.6908 26
1 0.7185
0.689 0.6368
1 0.6459
0.6152 0.6191 27
1 0.6648
0.6452 0.5633 1
0.5822 0.561
0.542 28
1 0.6092
0.6058 0.4853 1
0.5176 0.5122 0.4602
29 1
0.5524 0.5722 0.4036
1 0.4533
0.4707 0.3746 30
1 0.4952
0.5459 0.3189 1
0.3902 0.4381 0.2858
31 1
0.4383 0.5277 0.2322
1 0.3296
0.4156 0.1949 32
1 1.5261
0.5185 0.1442 1
0.8085 0.4042 0.1026
Amplitudo d = 0.5
λ d = 0.75
λ
Tabel 2 . Hasil perhitungan Sintesa Amplitudo 16 elemen
elemen Uniform Chebyshev Taylor
Cosine Uniform Chebyshev Taylor Cosine 1
1 0.8668
0.522 0.1886
1 0.4907
0.4083 0.1492 2
1 0.5043
0.5584 0.3625 1
0.4018 0.4533 0.3315
3 1
0.6217 0.6257 0.5263
1 0.5334
0.5365 0.5033 4
1 0.7334
0.7135 0.6737 1
0.6651 0.6453 0.6578
5 1
0.8327 0.8086 0.7991
1 0.7867
0.763 0.7893 6
1 0.9135
0.8964 0.8976 1
0.8884 0.8717 0.8926
7 1
0.9705 0.9636 0.9654
1 0.9617
0.955 0.9637 8
1 1
1 1
1 1
1 1
9 1
1 1
1 1
1 1
1 10
1 0.9705
0.9636 0.9654 1
0.9617 0.955 0.9637
11 1
0.9135 0.8964 0.8976
1 0.8884
0.8717 0.8926 12
1 0.8327
0.8086 0.7991 1
0.7867 0.763 0.7893
13 1
0.7334 0.7135 0.6737
1 0.6651
0.6453 0.6578 14
1 0.6217
0.6257 0.5263 1
0.5334 0.5365 0.5033
15 1
0.5043 0.5584 0.3625
1 0.4018
0.4533 0.3315 16
1 0.8668
0.522 0.1886
1 0.4907
0.4083 0.1492 d = 0.75
λ Amplitudo
Amplitudo d = 0.5
λ
Tabel 3 . Hasil perhitungan Sintesa Amplitudo 8 elemen
Elemen Uniform Chebyshev Taylor
Cosine Uniform Chebyshev Taylor Cosine 1
1 0.5799
0.5368 0.279
1 0.3778
0.4255 0.244
2 1
0.6603 0.6725 0.6098
1 0.5843
0.5937 0.5908 3
1 0.8751
0.8643 0.863
1 0.8424
0.8317 0.8563 4
1 1
1 1
1 1
1 5
1 1
1 1
1 1
1 6
1 0.8751
0.8643 0.863
1 0.8424
0.8317 0.8563 7
1 0.6603
0.6725 0.6098 1
0.5843 0.5937 0.5908
8 1
0.5799 0.5368
0.279 1
0.3778 0.4255
0.244 d = 0.5
λ d = 0.75
λ Amplitudo
Tabel 4 dan 5 menunjukkan hasil sintesa karakteristik directivity, beamwidth dan SLL pada
masing-masing distribusi amplitudo untuk 8, 16 dan 32 elemen dengan jarak antar elemen, d = 0.5
λ dan 0.75
λ.
Tabel 4. Karakteristik Antena pada 4 jenis distribusi dengan d = 0.5
λ
Jumlah elemen Jenis distribusi Directivity dB
Beamwidth º SLL dB
Uniform 15.9
12.6 -13.3
8 Chebyshev
15.4 15.1
-25.7 Taylor
15.4 13.1
-15.3 Cosine
15.1 16.1
-24.5 Uniform
18.9 6.3
-13.3 16
Chebyshev 18.5
7.3 -25.6
Taylor 18.5
7.4 -25.2
Cosine 18.1
8.2 -23.3
Uniform 21.9
2.9 -13.3
32 Chebyshev
21.5 3.5
-26.1 Taylor
21.5 3.6
-24.1 Cosine
21.1 4.1
-23.8
Tabel 5. Karakteristik Antena pada 4 jenis distribusi dengan d = 0.75
λ
Jumlah elemen Jenis distribusi Directivity dB
Beamwidth º SLL dB
Uniform 15.9
12.6 -13.3
8 Chebyshev
15.7 14
-20.6 Taylor
15.7 14.2
-20.8 Cosine
15.2 15.8
-24 Uniform
18.9 6.3
-13.3 16
Chebyshev 18.7
6.7 -20.5
Taylor 18.7
7 -20.7
Cosine 18.2
8 -23
Uniform 23.8
2.1 -17.9
32 Chebyshev
23.3 2.3
-30.1 Taylor
23.4 2.3
-25.2 Cosine
22.9 2.5
-31
Tabel 6 merupakan hasil sintesa dengan beamwidth sebesar 2.5 º sesuai dengan kriteria yang
ditentukan
Tabel 6. Karakteristik antena bila beamwidth =
2.5º
Distribusi amplitudo jarak antar elemen Direktivity
SLL
Uniform 1.9
22.7 -13.7
Chebyshev 2.1
22.7 -26.7
Taylor 2.2
22.9 -25.3
Cosine 2.4
23 -33.8