Perbandingan Kinerja Pembentukan Beam Menggunakan Metode Dolph-Chebyshev Dan Taylor Pada Phased Array Antena Untuk Sistem Komunikasi Dan Radar

Erawan, Abdullah Pujakusuma (2016) Perbandingan Kinerja Pembentukan Beam Menggunakan Metode Dolph-Chebyshev Dan Taylor Pada Phased Array Antena Untuk Sistem Komunikasi Dan Radar. Undergraduate thesis, Institut Teknologi Sepuluh Nopember Surabaya.

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Abstract

Sistem komunikasi generasi terbaru (5G) dituntut mampu menerapkan teknologi smart antenna, dengan memanipulasi bentuk beam antena sehingga pancaran gelombang radio terfokus ke arah pengguna. Di sisi lain, dalam sistem RADAR konvensional proses scanning dilakukan dengan memutar fisik antena, sehingga terdapat delay scan yang mengurangi kinerja RADAR. Selain itu beamwidth antena harus sempit agar dapat mendeteksi target dengan akurat. Permasalahan pada kedua sistem tersebut dapat diselesaikan menggunakan teknik pembentukan beam, yaitu pengaturan beamwidth dan level side lobe antena secara elektronis. Beamwidth optimal dengan level side lobe rendah dapat dicapai menggunakan teknik amplitude tapering. Pengarahan beam dapat diatasi menggunakan teknik konvensional beam steering, dengan mengimplementasikan penggeser phase digital. Dalam tugas akhir ini digunakan Dolph-Chebyshev dan Taylor sebagai metode amplitude tapering yang diimplementasikan dengan Software Defined Radio (SDR). Sistem diimplementasikan dengan konfigurasi array 1x3, pada frekuensi kerja 2.4 GHz. Berdasarkan hasil pengukuran Taylor tidak bisa diterapkan pada array 3 elemen. Jika dibandingkan dengan eksitasi uniform, pada SLL yang diinginkan -40dB, level side lobe DolphChebyshev terukur sebesar -31.55dB, lebih rendah 22.35dB, dan beamwidth yang terukur sebesar 43o, lebih lebar 9o. Pengarahan beam untuk eksitasi uniform pada sudut 140o menghasilkan beamwidth 51o, lebih lebar 5o dibandingkan saat di sudut 60o. Deteksi target bekerja baik untuk posisi target di antara sudut ±60o dari sudut broadside (90o) ====================================================================================================== The new generation system (5G) is required to capable for adjust smart antena technology, with manipulating antena’s beam form so the radio waves radiation could be focused to user. In other side, scanning process of conventional RADAR system is performed with rotating the physical part of antena, that produce scan delay so reduce RADAR’s performance. Furthermore, the antena beamwidth should be narrow to be able to detect target accurately. Problems on both systems, can be solved by using beam forming technique, that is controlling of beamwidth and side lobe level antena electronically. Optimum beamwidth with low side lobe level can be achieved using amplitude tapering technique. Beam steering can be solved using conventional beam steering, that is implementing digital phase shifter. This final project use Dolph-Chebyshev and Taylor as amplitude tapering methods that implemented with Software Defined Radio (SDR). This system is implemented with 1x3 array configuration, using frequency of 2.4GHz. Based on measurement result, Taylor can not be applied to array with 3 elements. Compared to uniform excitation, for expected SLL -40dB, the measured side lobe level od Dolph-Chebyshev is -31.44dB, that is 22.35dB lower, and the measured beamwidth is 43o, that is 9o wider. Beam steering for uniform excitation at 140o angle produce beamwidth of 51o, that is 5o wider that at 60o angle. Target detection works well for target position at angle between ±60o from broadside angle (90o)

Item Type: Thesis (Undergraduate)
Additional Information: RSE 621.384 Era p
Uncontrolled Keywords: Pembentukan beam, Pengarahan beam, SDR, Taylor, Dolph-Chebyshev, Smart antena
Subjects: H Social Sciences > HD Industries. Land use. Labor > HD30.335 Communication systems
Divisions: Faculty of Electrical Technology > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User: EKO BUDI RAHARJO
Date Deposited: 14 Apr 2020 09:40
Last Modified: 14 Apr 2020 09:40
URI: https://repository.its.ac.id/id/eprint/75782

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