Design and Analysis of Multi-Band Filtering Circuits

Description

The book systematically introduces the design theory and method of multi-band RF filtering circuits for the modern wireless communication systems or radar systems, which are required to operate at multi-bands. These multi-band filtering RF circuits have drawn more and more attention from the engineers and scientists in the field of RF circuits design. The book proposes the detailed theoretical analysis and abundant experimental data of multi-mode resonators, multi-band bandpass filter with high selectivity, reflectionless multi-band bandpass filter, balanced filter with high suppression, slotline based multi-band balun filter, switchable filtering diplexer based on reused L-shape resonator and miniaturized 55-/95-GHz on-chip dual-band bandpass Filter. The book is intended for undergraduate and graduate students who are interested in filtering circuits design, researchers who are investigating RF & microwave systems, as well as design engineers who are working in the RF & microwave circuits field. Readers can get an in-depth understanding about the multi-band RF filtering circuits design theory and method. Contents About the Author Abbreviations and Acronyms 1 Background of Multi-band Filtering Circuit 1.1 Importance of the Filtering Circuit 1.2 Importance of the Multi-band Filtering Circuit 1.3 Summary References 2 Analysis of Multi-Mode Resonator 2.1 Multi-Mode Resonator (MMR) 2.1.1 MMR Topologies 2.1.2 Step-Impedance Resonator (SIR) 2.1.3 Ring Resonator 2.1.4 Multi-Stub Resonator 2.1.5 Discussion 2.2 Transmission Line Types Suitable for MMR 2.2.1 Microstrip Line 2.2.2 Coupled Line 2.2.3 Slotline 2.3 Summary References 3 Multi-band Bandpass Filter with High Selectivity 3.1 High-Selectivity Multi-band Bandpass Filter Utilizing Asymmetrical Interdigital Coupled Lines and Circular Spiral Lines 3.1.1 Introduction 3.1.2 Dual-Band BPF Design 3.1.3 Tri-Band BPF Design 3.1.4 Quad-Band BPF Design 3.1.5 Adding Circular Spiral Lines 3.1.6 Circuit Implementation 3.2 Compact Sept-Band Bandpass Filter Utilizing Single Multi-mode Resonator 3.2.1 Introduction 3.2.2 Schematic Topology 3.2.3 Design of Multi-mode Resonator 3.2.4 Controlling of Center Frequencies and Bandwidths 3.2.5 Design of the Proposed Sept-Band BPF 3.2.6 Circuit Implementation 3.3 Octo-Band Bandpass Filter Based on Unequal-Width Cruciform Connected Resonator with Sharp Skirt 3.3.1 Introduction 3.3.2 Design of Multi-Mode Resonator 3.3.3 Controllability of Center Frequencies and Bandwidths 3.3.4 Circuit Implementation 3.4 Summary References 4 Reflectionless Multi-band Bandpass Filter 4.1 Reflectionless Architectures Overview 4.1.1 Duplexer Structure 4.1.2 Directional Filter Structure 4.1.3 Symmetry and Duality Structure 4.2 Proposed Reflectionless Architecture by Reused Resonances 4.2.1 Circuit Structure 4.2.2 Design Procedure 4.3 Proposed Reflectionless Triple-Band Filter Prototype 4.3.1 Circuit Design and Analysis 4.3.2 Passbands Controllability Analysis 4.3.3 Circuit Implementation and Measurements 4.4 Proposed Reflectionless Tunable Dual-Band Filter Prototype 4.4.1 Circuit Architecture 4.4.2 Independently Tunable Resonances 4.4.3 Calculated Transfer Function 4.4.4 Absorbed Harmonic Signals 4.4.5 Circuit Implementation 4.5 Summary References 5 Balanced Filter with High Suppression 5.1 Microstrip-To-Slotline Transition 5.2 Slotline-Based Balanced Filter Details 5.2.1 Proposed π-Type Slotline Structures 5.2.2 Design of SRSRs and Controllability of the Passband 5.2.3 Effects of the Integration of π-Type Slotline Structures on Stopband Suppression, Insertion Loss and Size 5.3 Filter Implementation and Results 5.4 Summary References 6 Slotline Based Multi-band Balun Filter 6.1 High Selectivity Dual-Wideband Balun Filter Utilizing a Multimode T-Line Loaded Middle-Shorted CSRR 6.1.1 Design of the TLMS-CSRR 6.1.2 Controllability of Two Passbands 6.1.3 Effect of Folded Slotline and π-Shaped Slotline Structure 6.1.4 Circuit Implementation 6.2 Quad-Band Balun Filter Using Dual-Mode Spiral Slotline Notched Structure with Enhanced Selectivity 6.2.1 Design of Dual-Mode Notched Structure 6.2.2 Design of Quad-Band Balun Filter 6.2.3 Circuit Implementation 6.3 Summary References 7 Switchable Filtering Diplexer Based on Reused L-shape Resonator 7.1 Switchable Resonator Details 7.1.1 Mechanism of Switching Techniques 7.1.2 Effects of the Switching Technique on Frequency Selectivity, Insertion Loss and Size 7.1.3 Co-Design Details of the Switchable Resonator and Input Matching Network 7.2 Controllable Bandwidths and Center Frequencies 7.2.1 Controlling of Bandwidths 7.2.2 Controlling of Center Frequencies 7.3 Diplexer Implementation and Results 7.4 Summary References 8 Miniaturized 55-/95-GHz On-Chip Dual-Band Bandpass Filter 8.1 Filter Design 8.1.1 Structure Analysis of the Filter 8.1.2 Comparison Between the Short- and Open-Circuited Stubs 8.1.3 Controllable CFs, BWs and TZs 8.1.4 Selection of Matching Capacitance 8.2 EM Simulation 8.3 Summary References 9 Summary and Conclusions