臺灣博碩士論文加值系統

Antennas are an essential part in a communication system as they control a spatial and temporal coverage of the signal. Circularly polarized (CP) patch antennas have a wide range of applications because of their low profile, low cost, and easy fabrication. In this thesis, two antenna structures are presented for the Ka-band communications. Initially, two square patch antennas configured with side by side are designed at two different frequencies. Each patch element is excited by using two separate probe feeds for the right- and left-hand circular polarization operations. The cavity wall is used to improve the isolation of the design. For the second approach, dual stacked patch antenna is presented for the enhanced impedance bandwidth with reduced antenna area. Both designs used a 90-degree hybrid coupler to achieve LHCP & RHCP.

Acknowledgement i
ABSTRACT ii
CONTENTS iii
LIST OF FIGURES v
LIST OF TABLESx
Chapter 1 Introduction 1
1.1 Research Motivation 1
1.1.1 Introduction to the wireless communications 1
1.1.2 The aim of the thesis 1
1.2 Organization of the Thesis 2
Chapter 2 Introduction and Literature Survey 3
2.1 Microstrip antennas 3
2.2 Low-Temperature Co-fired Ceramic 7
Chapter 3 Design of Square Patch Dual Frequency and Dual polarized antenna 8
3.1 Introduction and Literature Survey 8
3.2 Antenna Configuration and Design 10
3.2.1 Proposed Structure and Design Parameters 10
3.2.2 Design of Square Microstrip Patch antenna 11
3.2.3 Design of the Quadrature Hybrid Coupler 14
3.2.4 Design of dual band and CP polarized antenna 19
3.3 Simulations and measurements results 22
3.3.1 Simulations 25
3.3.2 Prototype and Measurement 38
3.4 Summary 43
Chapter 4 Advanced Compact Design Using Stacked Patch Antenna 45
4.1 Introduction and Literature Survey 45
4.2 Antenna Configuration and Design 46
4.3 Simulations and measurements 49
4.3.1 Simulation results (HFSS) 49
4.3.1 Prototype and Measurement 68
4.4 Summary 90
Chapter 5 Conclusions 92
REFERENCES 93

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