PREFACE ........................................................ ix
1 INTRODUCTION ................................................. 1
1.1 Background on UWB Technology ............................ 2
1.2 UWB Regulations ......................................... 3
1.2.1 FCC Radiation Masks .............................. 3
1.2.2 ECC Radiation Masks .............................. 4
1.2.3 UWB Definition and Bandwidth ..................... 7
1.3 UWB Bandpass Filters .................................... 8
1.4 Organization of the Book ............................... 11
References .................................................. 13
2 TRANSMISSION LINE CONCEPTS AND NETWORKS ..................... 18
2.1 Introduction ........................................... 18
2.2 Transmission Line Theory ............................... 19
2.2.1 Basic Transmission Line Model ................... 19
2.2.2 Lossless Terminated Transmission Lines .......... 21
2.3 Microwave Network Parameters ........................... 26
2.3.1 Scattering Parameters for Two-Port Network ...... 26
2.3.2 [Z] and [Y] Matrices ............................ 30
2.3.3 ABCD Parameters ................................. 33
2.3.4 Conversions between S-, Z-, Y-, and ABCD-Matnx
Parameters ...................................... 38
2.4 Relative Theories of Network Analysis .................. 42
2.4.1 Even- and Odd-Mode Network Analysis ............. 42
2.4.2 Image Parameter Method .......................... 47
2.5 Summary ................................................ 52
References .................................................. 52
3 CONVENTIONAL PARALLEL-COUPLED LINE FILTER ................... 53
3.1 Introduction ........................................... 53
3.2 Lumped-Element Lowpass Filter Prototype ................ 54
3.2.1 Maximally Flat and Chebyshev Characteristics .... 54
3.2.2 Lumped-Element Ladder Network ................... 56
3.3 Impedance and Frequency Transformation ................. 65
3.3.1 Lowpass to Lowpass Transformation ............... 66
3.3.2 Lowpass to Highpass Transformation .............. 66
3.3.3 Lowpass to Bandpass Transformation .............. 67
3.3.4 Lowpass to Bandstop Transformation .............. 68
3.4 Immittance Inverters ................................... 70
3.5 Lowpass Prototype Filter with Immittance Inverter ...... 71
3.6 Parallel-Coupled Line Bandpass Filter .................. 76
3.7 Summary ................................................ 84
References .................................................. 84
4 PLANAR TRANSMISSION LINE RESONATORS ......................... 85
4.1 Introduction ........................................... 85
4.2 Uniform Impedance Resonator ............................ 87
4.2.1 Short-Circuited λg/2 Transmission Line .......... 87
4.2.2 Open-Circuited λg/2 Transmission Line ........... 89
4.2.3 Short-Circuited λg/4 Transmission Line .......... 91
4.2.4 Open-Circuited λg/4 Transmission Line ........... 93
4.3 Stepped Impedance Resonators ........................... 94
4.3.1 Fundamental Properties of SIR ................... 95
4.3.2 Slope Parameters of SIR ........................ 101
4.3.3 Design of the Parallel-Coupled Line Bandpass
Filters with SIR ............................... 102
4.4 Multiple-Mode Resonator ............................... 104
4.4.1 Open-Circuited Multiple-Mode Resonator ......... 104
4.4.2 Short-Circuited Multiple-Mode Resonator ........ 108
4.4.3 Design of the Parallel-Coupled Line Bandpass
Filters with MMRs .............................. 109
4.5 Summary ............................................... 113
References ................................................. 114
5 MMR-BASED UWB BANDPASS FILTERS ............................. 116
5.1 Introduction .......................................... 116
5.2 An Initial MMR-Based UWB Bandpass Filter .............. 118
5.3 UWB Bandpass Filters with Varied Geometries ........... 121
5.3.1 Aperture-Backed PCML ........................... 121
5.3.2 Broadside Microstrip/CPW ....................... 122
5.3.3 Inductive Coupling Element on CPW .............. 125
5.4 UWB Filters with Improved Out-of-Band Performance ..... 130
5.4.1 Capacitive-Ended Interdigital Coupled Lines .... 130
5.4.2 Coupling between Two Feed Lines ................ 134
5.4.3 Stub-Loaded MMR ................................ 136
5.4.4 Lowpass Embedded MMR ........................... 140
5.5 UWB Bandpass Filter with a Notch Band ................. 142
5.6 Summary ............................................... 146
References ................................................. 146
6 SYNTHESIS APPROACH FOR UWB FILTERS ......................... 149
6.1 Introduction .......................................... 149
6.2 Transfer Function ..................................... 150
6.3 Transmission Line Network with Pure Shunt/Series
Stubs ................................................. 152
6.4 Transmission Line Network with Hybrid Series and
Shunt Stubs ........................................... 163
6.5 MMR-Based UWB Filter with Parallel-Coupled Lines ...... 178
6.6 Summary ............................................... 187
References ................................................. 187
7 OTHER TYPES OF UWB FILTERS ................................. 188
7.1 Introduction .......................................... 188
7.2 UWB Filters with Highpass and Lowpass Filters ......... 188
7.3 UWB Filters with Optimum Shunt Short-Circuited
Stubs ................................................. 191
7.3.1 UWB Filter with Extended Upper Stopband ........ 192
7.3.2 UWB Filter with Enhanced Selectivity ........... 194
7.4 UWB Filters with Quasi-Lumped Elements ................ 195
7.4.1 UWB Filter Implemented with Suspended Strip
Line ........................................... 195
7.4.2 UWB Filter Implemented on Liquid Crystal
Polymer (LCP) .................................. 195
7.5 UWB Filters with Composite CPW and Microstrip
Structure ............................................. 197
7.6 UWB Filter with Microstrip Ring Resonator ............. 199
7.7 UWB Filter using Multilayer Structures ................ 203
7.8 UWB Filter with Substrate Integrated Waveguide (SIW) .. 205
7.9 UWB Filter with Notch Band ............................ 207
7.10 Summary ............................................... 210
References ................................................. 210
INDEX ......................................................... 214
|
