Time Distortion Analysis of Broadband Microwave Networks.
ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY
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One of the major problem areas in the design of wideband systems is the effects of the dispersive characteristics of components on the phase and amplitude of a signal. This paper presents a method of time domain analysis and an approach for equalizing discontinuities in broadband microwave systems typical of high resolution radar. A simple flowgraph representation is used to obtain the time response of a transmission line system having small discontinuities. It is shown that the echoes which result are also derivable from Wheelers paired echo theory in which the discontinuity effects are expressed in the frequency domain. The analysis is then generalized for an arbitrary number of small discontinuities arbitrarily spaced. Techniques for minimizing echoes resulting from these distortions are presented. The system designer may exercise control over the phase of the reflection coefficient, adjust the spacings between reflection coefficients, and may even include such devices as isolators and electrically switched phase shifters in the system. Echoes which have little effect on the performance of high range resolution radars are also discussed from their time and frequency domain representations. Author
- Active and Passive Radar Detection and Equipment
- Radio Communications