Abstract
The axial electromagnetic backscattering by four objects characterized in part by either a circular aperture or circular conducting surface is studied. Impulse response waveforms for finite and open circular waveguides, a circular loop and a thin circular disc are synthesized from exact and/or approximate frequency domain scattering data. Complex natural resonances of the four objects are compared to illustrate similar and dissimilar features. For the open circular waveguide it is demonstrated that approximate scattering solutions for loaded guides in the resonance region can be obtained by properly combining low and high frequency estimates.
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