Short-duration positive and negative pulses caused by unequal phase velocities of coupled strip lines

Iwata Sakagami; Satoshi Chino

doi:10.1117/12.175755

13 May 1994 Short-duration positive and negative pulses caused by unequal phase velocities of coupled strip lines

Iwata Sakagami, Satoshi Chino

Proceedings Volume 2154, Intense Microwave Pulses II; (1994) https://doi.org/10.1117/12.175755
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Short-duration pulses caused by the difference of even and odd mode phase velocities that arise in two strip coupled line networks are discussed on the basis of network functions derived from signal flow graphs. A ramp-waveform of rise-time 0.1 nsec is assumed as an input. Simulated waveforms are presented by using the fundamental transmission line equation in an inhomogeneous medium. With regard to the even and odd mode phase velocities, Ve and Vo, either Ve < Vo or Ve >= Vo takes place according to the cross-sectional structure. Referring to a microwave C-section, a directional coupler, and open/short terminal networks, several patterns of output responses are shown: The polarity of the short-duration pulses can be changed by the cross-sectional structure, or by network terminal conditions. The amplitude of the first short pulse increases up to one half of the amplitude of an incident ramp waveform as the coupling is weaker, and other pulses appearing after the first short pulse become so small as to be negligible.

Citation Download Citation

Iwata Sakagami and Satoshi Chino "Short-duration positive and negative pulses caused by unequal phase velocities of coupled strip lines", Proc. SPIE 2154, Intense Microwave Pulses II, (13 May 1994); https://doi.org/10.1117/12.175755

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KEYWORDS

Microwave radiation

Phase velocity

Directional couplers

Circuit switching

Astatine

Aluminum

Convolution

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