本論文提出四種雙頻印刷式單極天線。三種天線操作在2.4 GHz與5.2/5.8 GHz WLAN頻段和一種雙寬頻印刷式單極天線操作在2.4/5.2/5.8 GHz與2.5/3.5/5.5 GHz WiMAX頻段，所提出的天線結構主要使用兩種方法來達成雙頻與雙寬頻操作。第一種方法是在單極輻射元件中形成兩條不同的共振路徑，分別激發兩個操作頻率，所提出的架構為印刷式G型單極天線。第二種方法是在單極輻射元件的背面放置一金屬面來擾動整個單極輻射元件的共振特性，以提升阻抗頻寬，利用此方法所提出的天線架構有三種，其中一種為印刷式矩形單極天線搭配一個背面梯型金屬面具有最佳的寬頻性能。所提出的四種天線量測結果與模擬結果都相當符合且具有令人滿意的性能。

This dissertation presents four dual-band printed monopole antennas. There are three printed monopole antennas operating in 2.4 GHz and 5.2/5.8 GHz WLAN bands, and a dual wideband printed monopole operating applies in 2.4/5.2/5.8 GHz WLAN bands and 2.5/3.5/5.5 GHz WiMAX bands. The proposed antennas mainly use two approaches to achieve dual-band and dual wideband operations. The first method uses two different resonant paths in radiating monopole to excite two desired operating frequencies. The proposed configuration using the first method is a printed G-shaped monopole antenna. The second method places the conductor-backed plane on the other side of the radiated monopole to perturb its resonant behaviors for enhancing impedance bandwidth. Three configurations using the second method are proposed. The one with the best wideband performance is a printed rectangular monopole antenna with a trapezoid conductor-backed plane. Measured results for the proposed antennas show satisfactory performances and good agreement with the simulated results.

1Introduction 1
1.1Research Motivation 1
1.2Planar Antennas 2
1.2.1Microstrip Antenna 2
1.2.2Printed Antenna 4
1.3Literature Survey 6
1.4Overview of Dissertation 7
2Monopole Antenna Analysis 8
2.1Half-Wavelength Dipole 8
2.2Monopole 10
2.3Simulations for Printed Monopole Antenna 12
3Dual Band Printed G-Shaped Monopole Antenna 16
3.1Antenna Configuration 16
3.2Design and Simulation 18
3.3Measured Results and Discussions 19
4Dual Band Printed Stepped-Width Monopole Antenna with Conductor-Backed Plane 28
4.1Printed Crisscross Monopole Antenna with a Square Conductor-Backed Plane 28
4.1.1Antenna Configuration 28
4.1.2Design and Simulation 29
4.1.3Measured Results and Discussions 31
4.2Printed I-Shaped Monopole Antenna with a Circular Conductor-Backed Plane 44
4.2.1Antenna Configuration 44
4.2.2Design and Simulation 45
4.2.3Measured Results and Discussions 46
5Dual Wideband Printed Rectangular
Monopole Antenna with a Trapezoid
Conductor-Backed Plane 61
5.1Antenna Configuration 61
5.2Design and Simulation 62
5.3Measured Results and Discussions 63
6Conclusions 80
Bibliography 81
Vita89

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