Ultra-wideband source using gallium arsenide photoconductive semiconductor switches

Non-Thermal, Non-Ionizing Interaction of High-Intensity Electromagnetic Fields with Small-Scale Electronic and Biological Systems

“…In contrast, the Blumlein with the narrow center conductor has an output voltage of approximately 83% of the charge voltage. This is in agreement with earlier simulations [7]. However, the rise time penalty measured earlier is not apparent at these rise time scales.…”

“…In the coaxial configuration, the approximation of electromagnetically uncoupled lines is quite good. However, in a parallel plate configuration, there can be significant coupling of the two transmission lines through electric fields instead of currents [7]. This coupling can be included as a parasitic impedance as depicted in fig.…”

“…Specifically, the output pulse amplitude is reduced from the ideal V0 charge voltage and the waveform has some ringing [7]. In addition, the benefits of stacking Blumleins can be reduced due to these parasitic coupling terms.…”

“…In our application, the Blumlein output impedance (the impedance between the exterior conductors with no intermediate conductor present) is selected to be approximately 100 Q. It has been shown that the output to charge voltage ratio (Vo/V,) of a Blumlein is related to the ratio of the intermediate plate width to the exterior conductor plate widths because of the reduction in the parasitic capacitances in the Blumlein [7]. Experimental investigations have indicated that although increasing the intermediate conductor plate width does in fact increase the ratio VoNc, the increased plate width may increase the rise time to maximum output voltage as compared to an intermediate plate equal in width to the two exterior conductors.…”

“…In addition, the benefits of stacking Blumleins can be reduced due to these parasitic coupling terms. The parasitic impedance can be controlled by modifying the geometry as presented below [7].…”