Studi Bandwidth Antena Mikrostrip Struktur Bi-Quad Hingga Bi-Circular

Bustomi, Muhammad Arief (2021) Studi Bandwidth Antena Mikrostrip Struktur Bi-Quad Hingga Bi-Circular. Doctoral thesis, Institut Teknologi Sepuluh Nopember.

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Disertasi M. Arief Bustomi 01111460010001 Dep Fisika FSAD.pdf - Accepted Version
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Disertasi M. Arief Bustomi 01111460010001 Dep Fisika FSAD.pdf
Restricted to Repository staff only

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Abstract

Karakteristik antena ditentukan oleh sifat-sifat fisika bahan antena, struktur antena dan geometri antena. Berbagai metode telah dikembangkan untuk mendapatkan karakteristik antena. Metode-metode tersebut dapat berupa simulasi menggunakan sebuah software desain antena mikrostrip seperti CST atau berupa pengukuran karakteristik sebuah desain antena menggunakan peralatan ukur seperti network analyzer. Kedua jenis metode tersebut pada dasarnya adalah metode uji coba (trial-error). Hal ini disebabkan oleh belum adanya pengetahuan tentang kaitan antara karakteristik antena dengan parameter-parameter antena tersebut. Dalam penelitian disertasi ini dipelajari kaitan bandwidth antena dengan salah satu parameter desain antena yaitu struktur geometrinya. Tujuan penelitian disertasi adalah untuk mendapatkan sebuah karakteristik bandwidth antena mikrostrip berdasarkan perbedaan struktur geometri. Dua metode pendekatan dilakukan dalam penelitian ini, yaitu metode simulasi dan metode eksperimen. Untuk keperluan ini, diteliti dan dianalisa bandwidth dari dua struktur geometri antena mikrostrip yaitu struktur bi-quad dan struktur bi-circular. Langkah-langkah dalam penelitian disertasi adalah: (1) membuat simulasi penentuan bandwidth antena bi-quad dan bi-circular, (2) membuat fabrikasi kedua struktur antena dan mengukur bandwidthnya menggunakan network analyzer, (3) mengembangkan model antena bi-poligonal untuk mendapatkan formula kaitan antara struktur geometri antena dan bandwidthnya dan menggunakan data-data hasil simulasi dan pengukuran untuk validasi model tesebut. Hasil penerapan model antenna bi-poligonal pada desain antenna bi-quad dan bi-circular telah memperlihatkan bahwa penyebab terjadinya perubahan bandwidth dan pergeseran frekuensi kerja adalah perubahan nilai induktasi dan kapasitansi antena karena perubahan geometri desain antena dari bi-quad menjadi bi-circular. Perubahan geometri antena dari bi-quad menjadi bi-circular menyebabkan perubahan bandwidth dari 120 MHz menjadi 100 MHz dan pergeseran frekuensi kerja dari 2,62 GHz menjadi 2,45 GHz. Perubahan ini disebabkan oleh perubahan induktasi antena dari 26,5872 nH menjadi 29,4467 nH dan perubahan kapasitansi antena dari 0,1389 pF menjadi 0,1435 pF. Hasil pemodelan telah memberikan sebuah formula empiris kaitan antara bandwidth dan frekuensi kerja dengan bentuk geometri antena bi-poligonal. ============================================================================================== Antenna characteristics are determined by the physical properties of the antenna material, the antenna structure and the antenna geometry. Various methods have been developed to obtain antenna characteristics. These methods can be in the form of simulation using a microstrip antenna design software such as CST or in the form of measuring the characteristics of an antenna design using measuring equipment such as a network analyzer. Both types of methods are basically trial- error methods. This is due to the lack of knowledge about the relationship between antenna characteristics and antenna parameters. In this dissertation research, we studied the relationship between antenna bandwidth and one of the antenna design parameters, namely its geometric structure. The aim of the dissertation research was to obtain a bandwidth characteristic of microstrip antennas based on different geometric structures. Two approaches were used in this research, namely the simulation method and the experimental method. For this purpose, we researched and analyzed the bandwidth of two geometric structures of microstrip antennas, namely the bi-quad structure and the bi-circular structure. The steps in the dissertation research were: (1) made a simulation of determining the bandwidth of bi-quad and bi-circular antennas, (2) fabricated the two antenna structures and measured their bandwidth using a network analyzer, (3) developed a bi-polygonal antenna model to obtain a formula for the relationship between the antenna geometry structure and its bandwidth and used simulation and measurement data to validate the model. The results of the application of the bi-polygonal antenna model on the design of bi-quad and bi-circular antennas have shown that the cause of changes in bandwidth and shifts in working frequency is a change in the inductance and capacitance values of the antenna due to changes in the geometry of the antenna design from bi-quad to bi-circular. The change in antenna geometry from bi-quad to bi-circular causes a change in bandwidth from 120 MHz to 100 MHz and a shift in the working frequency from 2.62 GHz to 2.45 GHz. This change is caused by a change in antenna inductance from 26.5872 nH to 29.4467 nH and a change in antenna capacitance from 0.1389 pF to 0.1435 pF. The modeling results have provided an empirical formula for the relationship between bandwidth and operating frequency with the geometry of a bi-polygonal antenna

Item Type: Thesis (Doctoral)
Uncontrolled Keywords: Bandwidth, working frequency, bi-quad, bi-circular, change in geometric shape, Bandwidth, frekuensi kerja, bi-quad, bi-circular, perubahan bentuk geometri
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK6564 Radio transmitter-receivers
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7871.6 Antennas (Electronics)
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunication
Divisions: Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45001-(S3) PhD Thesis
Depositing User: MUHAMMAD ARIEF BUSTOMI
Date Deposited: 18 Aug 2021 14:58
Last Modified: 18 Aug 2021 14:58
URI: https://repository.its.ac.id/id/eprint/87385

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