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C-band quasi yagi antenna/Loh Kuok Chung

C-band quasi yagi antenna_Loh Kuok Chung_E3_2006_NI
Tesis ini akan menerangkan penyiasatan ke atas antena jalur lebar iaitu antena quasi Yagi. Antena ini akan difabrikan dengan bahan substratum yang mempunyai dielektrik konstan (FR4 dengan dielektrik konstan, εr = 5.4), ketebalan substratum 1.6 mm dan frequensi rekabentuknya adalah 4 GHz. Bahagian pertama akan menerangkan teori tentang antena mikrostrip dan talian penghantaran. Di samping itu, pengenalan kepada antena mikrostrip akan dipersembahkan, ini diikuti dengan persamaan rekabentuk dan informasi latar belakang antena mikrostrip jalur lebar. Ketga-tiga antena jalur lebar akan digambarkan, iaitu antena tampal, antena quasi Yagi dan antena riak tirus. Berbanding dengan antena tampal, kedua-dua elemen tunggal dan tatasusunan quasi Yagi antena menyinar pada arah hujung antena. Oleh itu, kedua-dua antena ini akan mencapai gandaan tinggi, cuping tepi kecil dan lebar jalur yang luas jika dibandingkan dengan antena tampal mikrostrip. Bahagian kedua tesis ini akan menerangkan langkah-langkah dan pertimbangan untuk merekabentuk antena tersebut. Rekabentuk antena ini adalah bertujuan untuk mendapat lebarjalur yang luas dan bentuk radiasi yang lebih baik. Di samping itu, analisa kepekaan antena quasi Yagi terhadap parameter rekabentuk akan ditunjukkan dalam Bab 4 tesis ini. Simulasi antena ini akan dijalankan dengan mengggunakan perisian Advanced Design System (ADS). Keputusan simulasi menunjukkan antena quasi Yagi beroperasi pada frekuensi jalur-C iaitu 4 GHz. ______________________________________________________________________________________ This thesis is concerned with investigations of types of broadband antenna elements namely quasi Yagi antenna. This antennas will be fabricated with a dielectric constant substrate material (FR4 with dielectric constantεr = 5.4), substrate thickness of 1.6mm and design frequency of 4 GHz. The first part of the thesis deals with the theory behind microstrip antennas and transmission lines. An introduction to microstrip antennas is presented, followed by a literature review on microstrip design equations and background information with regard to microstrip broadband planar antennas. The three most commonly used broadband planar antennas are illustrated, namely the Microstrip Patch antenna, quasi Yagi antenna and Tapered Slot Antenna. In contrast to the microstrip patch, both the arrays of quasi Yagi antenna and the single-element quasi Yagi antenna radiates at the end-fire direction. As a result, both these antennas can achieve higher gain, lower side lobes and wider bandwidth compared to the conventional microstrip patch antenna. The second part of the thesis is concerned with design procedures and considerations for the antenna. The design for the antennas is aimed at obtaining wider bandwidth and better radiation patterns. Besides, a sensitivity analysis of the quasi Yagi antenna with respect to the design parameters is demonstrated in chapter 4 of this thesis. The simulation of the quasi Yagi is accomplished by using Avanced Design System (ADS) software. The simulation results showed that the quasi Yagi antenna is able to achieve at the desired frequency (4 GHz) that is in the C band frequency.
Contributor(s):
Loh Kuok Chung - Author
Primary Item Type:
Final Year Project
Language:
English
Subject Keywords:
broadband; antenna ; quasi Yagi
First presented to the public:
5/1/2006
Original Publication Date:
4/30/2019
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Electrical & Electronic Engineering
Citation:
Extents:
Number of Pages - 77
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2019-04-30 16:20:51.26
Submitter:
Nor Hayati Ismail

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