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

ISBN-13: 9783642428616 / Angielski / Miękka / 2014 / 148 str.

Dhanasekharan Natarajan

Opis

This book presents the application of microwave literature for designing lumped/semi-lumped filters and combline/iris-coupled microwave cavity filters. It provides the physical understanding of the terms and characteristics of radio frequency (RF) filters. The book complements engineering text books on RF components and provides support for the project assignments of students. In addition to the functional design of RF filters, the integrated design approach for produceability and reliability is explained.

Spis treści

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.- RF Filter terms.- 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.- VSWR: OPEN CIRCUITED LOAD.- Relationship between incident & reflected voltages.- Instantaneous voltages of incident, reflected & resultant waves      .- Standing voltage wave in slotted line.- VSWR: SHORT CIRCUITED LOAD.- Relationship between incident & reflected voltages.- Instantaneous voltages of incident, reflected & resultant waves.- VSWR: MATCHED 50Ω LOAD.- VSWR: INFINITELY LONG 50Ω CABLE AS LOAD.- VSWR: PARTIALLY MATCHED LOAD.- 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) & weight.- Input/Output connections.- Finish.- ENVIRONMENTAL SPECIFICATIONS.- ADDITIONAL SPECIFICATIONS.- RF Filter design technologies.- TECHNOLOGIES.- LUMPED RF FILTERS.- Low pass & high pass filters.- Band pass & band reject filters.- SEMI-LUMPED RF FILTERS.- Distributed capacitance.- Concept of semi-lumped RF filter.- MICROWAVE CAVITY FILTERS.- Resonance in microwave coaxial cavity.- Combline & 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 & STRIPLINE FILTERS.- 1 Materials.- Basic microstrip.- Basic stripline.- Computer aids for filter design.- 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 & THEIR REVIEW.- Sources of data for review.- INTERNAL TESTING & VALIDATION.- Design of lumped & semi-lumped RF filters.- 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.- 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.- Design of microwave cavity filters.- INTRODUCTION.- COMBLINE BAND PASS FILTER.- Cavity block.- Resonators.- Cover plate.- Other piece parts.- Materials & finish of parts.- ILLUSTRATED DESIGN OF COMBLINE FILTER.- Computational steps for combline filter.- Number of filter sections.- Resonator length.- Width & 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 & parts.- ILLUSTRATED DESIGN OF IRIS-COUPLED FILTERS.- Computational steps for filter design parameters.- Number of filter sections.- Diameter & height of cavity & resonators.- Width, height & 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 & time domains.- 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 & TRY’ METHOD.- CROSS COUPLING FOR STEEP ROLL DOWN FILTERS.- AIR GAP BETWEEN RESONATOR & TUNING SCREW.- DUPLEXERS.- DEVELOPING FILTER DESIGN SOFTWARE.- Appendix-1: Modes of propagation.- Appendix-2: Statistical analysis on RF filter characteristics.- Appendix-3: Coaxial connectors for RF filters.

O autorze

Dhanasekharan Natarajan, Electronics Engineer from College of Engineering, Guindy, Chennai in 1970, obtained his post-graduate in Engineering Production from the University of Birmingham, UK in 1984.  He retired as Asst. Professor in RV College of Engineering, Bangalore.  His earlier professional achievements at Bharat Electronics and Radiall Protectron include Application of modern Q&R techniques for defence equipments, Designing and implementing computerized Quality Management System, Designing software for Optical interferometer and Design/manufacturing of lumped, semi-lumped and microwave cavity filters using self-developed software.