
Accession Number : AD0844477
Title : An Investigation of a Phase Interference Passive Network.
Descriptive Note : Masters thesis,
Corporate Author : AIR FORCE INST OF TECH WRIGHTPATTERSON AFB OH SCHOOL OF ENGINEERING
Personal Author(s) : Hanby, James W. ; Hadfield, Thomas R.
Report Date : AUG 1968
Pagination or Media Count : 164
Abstract : Phase interference filters are bridge networks in which the outputs of the bridge arms are summed to produce the desired filter effects. The following rates of decay were obtained in the magnitude characteristics by varying the pole locations of the transfer function: 12 decibels per octave when the poles were all real, 18 decibels per octave when one complex conjugate pair was located on a circle centered at the origin, 21 decibels per octave when one complex conjugate pair was located on an ellipse. Phase characteristics are determined and the lowpass filter is found to be linear phase up to nearly the halfpower frequency. A transient response of the lowpass filter is conducted by analog simulation of the transfer function. A maximum of 10% overshoot is experienced when a complex conjugate pair of poles is located on a circle. The same method of analyzing the transfer function is applied to the highpass filter with the following magnitude characteristics, 12 decibels per octave when all poles are real and 18 decibels per octave when a complex conjugate pair is located on a circle. A highpass filter is then synthesized by these methods and tested. The halfpower frequency is found to be in error by 1.6% and the cutoff frequency by 12% of the theoretical values. (Author)
Descriptors : (*ELECTRIC FILTERS, PHASE(ELECTRONICS)), WAVE PROPAGATION, ELECTRIC BRIDGES, TRANSFER FUNCTIONS, SYNTHESIS, HIGH PASS FILTERS, LOW PASS FILTERS, TRANSIENTS, THESES.
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE