14-11-2012, 05:08 PM
MICROWAVE FILTERS DESIGN
MICROWAVE FILTERS DESIGN.ppt (Size: 348.5 KB / Downloads: 60)
INTRODUCTION
DEFINITIONS & CLASIFICATIONS OF MICROWAVE FILTERS
FREQUENCY RANGE : 200MHZ TO 90 GHZ
LOW FREQUENCY TECHNIQUES & THEIR LIMTATIONS
AT HIGHER FREQUENCIES OPTICAL TECHNIQUES & THEIR LIMITATIONS
CLASIFICATION BY TYPE: (LP, HP, BP, BS)
CLASIFICATION BY FRACTIONAL B.W.
CLASIFICATION BY TRANSIMISSION MEDIUM
LOWER FREQUENCY TECHNIQUES LIMITATIONS
LOW FREQUENCIES ARE DEFINED TO BE BELOW 200 MHZ
LUMPED ELEMENT SIZES (R, L, C) BECOME COMPARABLE TO WAVELENGTH
RADIATION FROM ELEMENTS CAUSES UNDESIRABLE EFFECTS
INCREASED LOSSES
WIRE CONNECTIONS BETWEEN ELEMENTS BECOME PART OF CIRCUIT (PARASETICS)
SOURCES & MEASUREMENT TECHNIQUES ARE UNSUITABLE AT HIGHER FREQUENCY
CLASSIFICATION BY TRANSMISSION MEDIUM
LUMPED & QUASI LUMPED ELEMENTS
COAXIAL TRANSMISSION LINES
MICROSTRIP LINES
SUSPENDED SUBSTRATE LINES
STRIP LINES
RECTANGULAR OR CYLENDRICAL WAVEGUIDES
HIGH DIELECTRIC CONSATANT FILLED (OR PARTIALLY LOADED) COAXIAL LINES OR WAVEGUIDES
APPLICATIONS OF MICROWAVE FILTERS
COMMUNICATION SYSTEMS:
TERRESTRIAL MICROWAVE LINKS: RECEIVERS PROTECTION FILTERS, TRANSMITTER FILTERS, CHANNEL DROPPING FILTERS, TRANSMITTER HARMONIC FILTERS, LOCAL OSCILLATOR FILTERS, MIXERS IMAGE REJECT FILTERS
SATELLITE SYSTEMS:
SPACE CRAFT: FRONT END RECEIVE FILTERS, INPUT MULTIPLEXERS CHANNELIZATION FILTERS, OUTPUT MULTIPLEXERS FILTERS, TRANSMITTERS HARMONIC REJECTION FILTERS
EARTH STATIONS : LNA’S TRANSMIT REJECT FILTERS, HPA’S HARMONIC REJECT FILTERS, UP & DOWN CONVERTERS FILTERS