A Practical Design of Lumped, Semi-lumped & Microwave Cavity Filters

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1 Lecture Notes in Electrical Engineering 183 A Practical Design of Lumped, Semi-lumped & Microwave Cavity Filters Bearbeitet von Dhanasekharan Natarajan 1. Auflage Buch. xii, 148 S. Hardcover ISBN Format (B x L): 15,5 x 23,5 cm Gewicht: 409 g Weitere Fachgebiete > Technik > Elektronik > Mikrowellentechnik Zu Leseprobe schnell und portofrei erhältlich bei Die Online-Fachbuchhandlung beck-shop.de ist spezialisiert auf Fachbücher, insbesondere Recht, Steuern und Wirtschaft. Im Sortiment finden Sie alle Medien (Bücher, Zeitschriften, CDs, ebooks, etc.) aller Verlage. Ergänzt wird das Programm durch Services wie Neuerscheinungsdienst oder Zusammenstellungen von Büchern zu Sonderpreisen. Der Shop führt mehr als 8 Millionen Produkte.

2 Contents 1 Introduction to RF Filters Need for Filters Filtering Circuits Types of Filters Low Pass Filters High Pass Filters Band Pass Filters Band Reject Filters Application of RF Filters References RF Filter Terms Introduction Impedance Definition Load Resistor at Radio Frequency Standard Terminations RF Transmission Line Definition Types of Transmission Lines Coaxial Transmission Lines Construction and Characteristics Standard Coaxial Air Lines Microstrip/Stripline Transmission Lines Characteristic Impedance VSWR Maximum Power Transfer Practical Significance of VSWR xiii

3 xiv Contents 2.8 VSWR: Open Circuited Load Relationship Between Incident and Reflected Voltages Instantaneous Voltages of Incident, Reflectedand Resultant Waves Standing Voltage Wave in Slotted Line VSWR: Short Circuited Load Relationship Between Incident and Reflected Voltages Instantaneous Voltages of Incident, Reflected and Resultant Waves VSWR: Matched 50 X Load VSWR: Infinitely Long 50 X Cable as Load VSWR: Partially Matched Load References Requirements of RF Filter Sub-Contracting Process Sample Electrical Specifications of Filters Pass Band Pass Band Ripple Insertion Loss Return Loss Cut-Off Frequency Rejection Graphical Representations Mechanical Specifications Dimensions (Outline) and Weight Input/Output Connections Finish Environmental Specifications Additional Specifications RF Filter Design Technologies Technologies Lumped RF Filters Low Pass and High Pass Filters Band Pass and Band Reject Filters Semi-Lumped RF Filters Distributed Capacitance Concept of Semi-Lumped RF Filter

4 Contents xv 4.4 Microwave Cavity Filters Resonance in Microwave Coaxial Cavity Combline and Iris-Coupled Cavity Filters Power Handling Capacity Combline Band Pass Filters Structure Equivalent Circuit Insertion Loss Iris-Coupled Band Pass Filters Cavity Filters with Dielectric Resonators Microstrip and Stripline Filters Materials Basic Microstrip Basic Stripline Computer Aids for Filter Design References Planning the Design of RF Filters Need for Planning Design Benefits of Value Added Functional Design Planning Design Phase Understanding Customer Requirements Setting Internal Specifications Need for Internal Specifications Statistical Method of Setting Internal Specifications Recommended Internal Specification Limits Computations of Filter Parameters Design Drawings and Their Review Sources of Data for Review Internal Testing and Validation Reference Design of Lumped and Semi-Lumped RF Filters Introduction Lumped RF Filters Selection of Filter Parts Illustrated Design of Lumped RF Filter Computational Steps for Filter Design Parameters Number of Filter Elements Values of Filter Elements Layout Design for Filter Elements End Coupling Tuning of Lumped RF Filter

5 xvi Contents 6.4 Illustrated Design of Tubular Filter Number of Filter Elements Values of Tubular Filter Elements Realisation of Tubular Filter Tuning of Tubular Filter Design of Coils References Design of Microwave Cavity Filters Introduction Combline Band Pass Filter Cavity Block Resonators Cover Plate Other Piece Parts Materials and Finish of Parts Illustrated Design of Combline Filter Computational Steps for Combline Filter Number of Filter Sections Resonator Length Width and Thickness of Rectangular Resonators Rectangular to Cylindrical Resonators Spacing Between Resonators Length of Cavity Capacitance for Tuning Resonators Height of Cavity Iris-Coupled Band Pass Filters Structure and Parts Illustrated Design of Iris-Coupled Filters Computational Steps for Filter Design Parameters Number of Filter Sections Diameter and Height of Cavity and Resonators Width, Height and Thickness of Irises End Coupling in Cavity Band Pass Filters Probe Coupling Tag Coupling Tuning of Cavity Band Pass Filters Adjustment Available for Tuning Tuning Procedure Tuning of Filters in Frequency and Time Domains References

6 Contents xvii 8 Practical Expertise for Filter Design Opportunities for Learning Visual Examination of Assembled PCBs Preservation of Silver Plated Parts Precautions for Chip Ceramic Capacitors Centre Contact Retention in Coaxial Connectors Mechanical Designs Tuning of Filters Cut and Try Method Cross Coupling for Steep Roll Down Filters Air Gap Between Resonator and Tuning Screw Duplexers Developing Filter Design Software References Appendix A: Modes of Propagation Appendix B: Statistical Analysis on RF Filter Characteristics Appendix C: Coaxial Connectors for RF Filters About the Author Index

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