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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.

This paper presents an ultraminiaturized bandstop closed‐loop 2.5D frequency‐selective surface (FSS) for sub‐6 GHz 5G wireless communication. Four metallic vertical vias interconnect metallic elements present on both sides of the substrate to form a modified closed‐loop design. The proposed structure band stops the entire sub‐6 GHz 5G band (C‐band/NR N78 band/LTE 42/43 band) ranging from 3.2 to 3.9 GHz with a resonant notch at 3.62 GHz. This design supports polarization insensitivity and procures maximum relative deviation of 0.5% and 0.2% at 80°incident transverse electric (TE) and transverse magnetic (TM) polarized waves, respectively. The proposed FSS prototype has been fabricated and tested. Experimentally, the resonant notch is obtained at 3.55 and 3.68 GHz under TE and TM normal incident polarized waves, respectively. Moreover, good agreement in the frequency response curves is observed between simulated and measured results. The proposed unit cell is 3.6 × 3.6 mm2 in dimensions, which is 0.04λ × 0.04λ, where λ is the resonant wavelength.

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Abstract:A novel modified printed monopole antenna with variable frequency band-notch characteristic for ultra-wideband (UWB) applications is presented. The proposed antenna consists of a truncated ground plane and a radiating patch with two tapered steps. To generate a notch band at 5-6 GHz with good level of band-notch a new T-shaped parasitic element placed on the back layer of the substrate along with a simple circular slot etched on the patch is implemented. The proposed antenna has a compact size of 14 × 20 mm 2 , a measured impedance bandwidth of 3.05 to 14.7 GHz for VSWR < 2 and exhibits an omni-directional H-plane radiation pattern throughout the UWB frequency range.