LEI ZHU, PhD, is Associate Professor at the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore. Dr. Zhu was the first to introduce an MMR-based filter in 2000, which has since spurred the successful development of a new class of wideband filters with fractional bandwidths larger than 60 percent. SHENG SUN, PhD, is Research Assistant Professor in the Department of Electrical and Electronic Engineering at The University of Hong Kong.RUI LI, PhD, is a Research Fellow in the Interconnection and Advanced Packaging Program at Singapore's Institute of Microelectronics. She was the recipient of both the NTU Research and the Ministry of Education Scholarships in Singapore.

• PREFACE ix 1 INTRODUCTION 11.1 Background on UWB Technology 21.2 UWB Regulations 31.3 UWB Bandpass Filters 81.4 Organization of the Book 112 TRANSMISSION LINE CONCEPTS AND NETWORKS 182.1 Introduction 182.2 Transmission Line Theory 192.3 Microwave Network Parameters 262.4 Relative Theories of Network Analysis 422.5 Summary 523 CONVENTIONAL PARALLEL-COUPLED LINE FILTER 533.1 Introduction 533.2 Lumped-Element Lowpass Filter Prototype 543.3 Impedance and Frequency Transformation 653.4 Immittance Inverters 703.5 Lowpass Prototype Filter with Immittance Inverter 713.6 Parallel-Coupled Line Bandpass Filter 763.7 Summary 844 PLANAR TRANSMISSION LINE RESONATORS 854.1 Introduction 854.2 Uniform Impedance Resonator 874.3 Stepped Impedance Resonators 944.4 Multiple-Mode Resonator 1044.5 Summary 1135 MMR-BASED UWB BANDPASS FILTERS 1165.1 Introduction 1165.2 An Initial MMR-Based UWB Bandpass Filter 1185.3 UWB Bandpass Filters with Varied Geometries 1215.4 UWB Filters with Improved Out-of-Band Performance 1305.5 UWB Bandpass Filter with a Notch Band 1425.6 Summary 1466 SYNTHESIS APPROACH FOR UWB FILTERS 1496.1 Introduction 1496.2 Transfer Function 1506.3 Transmission Line Network with Pure Shunt/Series Stubs 1526.4 Transmission Line Network with Hybrid Series and Shunt Stubs 1636.5 MMR-Based UWB Filter with Parallel-Coupled Lines 1786.6 Summary 1877 OTHER TYPES OF UWB FILTERS 1887.1 Introduction 1887.2 UWB Filters with Highpass and Lowpass Filters 1887.3 UWB Filters with Optimum Shunt Short-Circuited Stubs 1917.4 UWB Filters with Quasi-Lumped Elements 1957.5 UWB Filters with Composite CPW and Microstrip Structure 1977.6 UWB Filter with Microstrip Ring Resonator 1997.7 UWB Filter using Multilayer Structures 2037.8 UWB Filter with Substrate Integrated Waveguide (SIW) 2057.9 UWB Filter with Notch Band 2077.10 Summary 210References 210INDEX 214

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LEI ZHU, PhD, is Associate Professor at the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore. Dr. Zhu was the first to introduce an MMR-based filter in 2000, which has since spurred the successful development of a new class of wideband filters with fractional bandwidths larger than 60 percent. SHENG SUN, PhD, is Research Assistant Professor in the Department of Electrical and Electronic Engineering at The University of Hong Kong.RUI LI, PhD, is a Research Fellow in the Interconnection and Advanced Packaging Program at Singapore's Institute of Microelectronics. She was the recipient of both the NTU Research and the Ministry of Education Scholarships in Singapore.

• PREFACE ix 1 INTRODUCTION 11.1 Background on UWB Technology 21.2 UWB Regulations 31.3 UWB Bandpass Filters 81.4 Organization of the Book 112 TRANSMISSION LINE CONCEPTS AND NETWORKS 182.1 Introduction 182.2 Transmission Line Theory 192.3 Microwave Network Parameters 262.4 Relative Theories of Network Analysis 422.5 Summary 523 CONVENTIONAL PARALLEL-COUPLED LINE FILTER 533.1 Introduction 533.2 Lumped-Element Lowpass Filter Prototype 543.3 Impedance and Frequency Transformation 653.4 Immittance Inverters 703.5 Lowpass Prototype Filter with Immittance Inverter 713.6 Parallel-Coupled Line Bandpass Filter 763.7 Summary 844 PLANAR TRANSMISSION LINE RESONATORS 854.1 Introduction 854.2 Uniform Impedance Resonator 874.3 Stepped Impedance Resonators 944.4 Multiple-Mode Resonator 1044.5 Summary 1135 MMR-BASED UWB BANDPASS FILTERS 1165.1 Introduction 1165.2 An Initial MMR-Based UWB Bandpass Filter 1185.3 UWB Bandpass Filters with Varied Geometries 1215.4 UWB Filters with Improved Out-of-Band Performance 1305.5 UWB Bandpass Filter with a Notch Band 1425.6 Summary 1466 SYNTHESIS APPROACH FOR UWB FILTERS 1496.1 Introduction 1496.2 Transfer Function 1506.3 Transmission Line Network with Pure Shunt/Series Stubs 1526.4 Transmission Line Network with Hybrid Series and Shunt Stubs 1636.5 MMR-Based UWB Filter with Parallel-Coupled Lines 1786.6 Summary 1877 OTHER TYPES OF UWB FILTERS 1887.1 Introduction 1887.2 UWB Filters with Highpass and Lowpass Filters 1887.3 UWB Filters with Optimum Shunt Short-Circuited Stubs 1917.4 UWB Filters with Quasi-Lumped Elements 1957.5 UWB Filters with Composite CPW and Microstrip Structure 1977.6 UWB Filter with Microstrip Ring Resonator 1997.7 UWB Filter using Multilayer Structures 2037.8 UWB Filter with Substrate Integrated Waveguide (SIW) 2057.9 UWB Filter with Notch Band 2077.10 Summary 210References 210INDEX 214

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LEI ZHU, PhD, is Associate Professor at the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore. Dr. Zhu was the first to introduce an MMR-based filter in 2000, which has since spurred the successful development of a new class of wideband filters with fractional bandwidths larger than 60 percent. SHENG SUN, PhD, is Research Assistant Professor in the Department of Electrical and Electronic Engineering at The University of Hong Kong.RUI LI, PhD, is a Research Fellow in the Interconnection and Advanced Packaging Program at Singapore's Institute of Microelectronics. She was the recipient of both the NTU Research and the Ministry of Education Scholarships in Singapore.

• PREFACE ix 1 INTRODUCTION 11.1 Background on UWB Technology 21.2 UWB Regulations 31.3 UWB Bandpass Filters 81.4 Organization of the Book 112 TRANSMISSION LINE CONCEPTS AND NETWORKS 182.1 Introduction 182.2 Transmission Line Theory 192.3 Microwave Network Parameters 262.4 Relative Theories of Network Analysis 422.5 Summary 523 CONVENTIONAL PARALLEL-COUPLED LINE FILTER 533.1 Introduction 533.2 Lumped-Element Lowpass Filter Prototype 543.3 Impedance and Frequency Transformation 653.4 Immittance Inverters 703.5 Lowpass Prototype Filter with Immittance Inverter 713.6 Parallel-Coupled Line Bandpass Filter 763.7 Summary 844 PLANAR TRANSMISSION LINE RESONATORS 854.1 Introduction 854.2 Uniform Impedance Resonator 874.3 Stepped Impedance Resonators 944.4 Multiple-Mode Resonator 1044.5 Summary 1135 MMR-BASED UWB BANDPASS FILTERS 1165.1 Introduction 1165.2 An Initial MMR-Based UWB Bandpass Filter 1185.3 UWB Bandpass Filters with Varied Geometries 1215.4 UWB Filters with Improved Out-of-Band Performance 1305.5 UWB Bandpass Filter with a Notch Band 1425.6 Summary 1466 SYNTHESIS APPROACH FOR UWB FILTERS 1496.1 Introduction 1496.2 Transfer Function 1506.3 Transmission Line Network with Pure Shunt/Series Stubs 1526.4 Transmission Line Network with Hybrid Series and Shunt Stubs 1636.5 MMR-Based UWB Filter with Parallel-Coupled Lines 1786.6 Summary 1877 OTHER TYPES OF UWB FILTERS 1887.1 Introduction 1887.2 UWB Filters with Highpass and Lowpass Filters 1887.3 UWB Filters with Optimum Shunt Short-Circuited Stubs 1917.4 UWB Filters with Quasi-Lumped Elements 1957.5 UWB Filters with Composite CPW and Microstrip Structure 1977.6 UWB Filter with Microstrip Ring Resonator 1997.7 UWB Filter using Multilayer Structures 2037.8 UWB Filter with Substrate Integrated Waveguide (SIW) 2057.9 UWB Filter with Notch Band 2077.10 Summary 210References 210INDEX 214

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