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variation of P min with thickness is shown in Figure 7(b) at 0 V. P min is improved, that is lowered with the increases in d. At larger d, the NEB is transit-time limited, and so the effect of confinement becomes significant. It may be seen that the effect of confinement is to deteriorate the P min except for a smaller diameter (e.g., 25 lm) and a smaller thickness (around 1 lm) when the confinement improves the minimum detectable power. CONCLUSIONS V CABSTRACT: This article presents the results of a novel triangular monopole antenna that exhibits multioctave performance. This modification significantly improves the antenna's impedance bandwidth by 167% over an ultrawideband frequency. The antenna's simulated return-loss and radiation patterns show very good correlation with the fabricated antenna's measured results.

Abstract:A novel compact band-notch ultra-wideband (UWB) printed monopole antenna is proposed, where the band notch characteristic is realized by inserting a pair of hook-shaped slit in the both side of radiating patch. Also, by inserting a π-shaped stub in the ground plane, additional resonance is excited and hence the bandwidth is increased up to 123%. This novel monopole antenna has ultrawide impedance bandwidth, compact size, low fabrication cost, and omnidirectional H-plane radiation patterns which are suitable for various broadband applications.