OBJECTIVE To assess level of contamination of neckwear worn by gynaecologists and obstetricians during routine working week. DESIGN Multicentre randomised double blind crossover trial. Participants wore the same conventional ties for three days in one week and bow ties for the same period in second week. SETTING Two teaching and three district general hospitals in the midlands, Wales, and n...

Localized radiative energy transfer from a near-field emitter to a magnetic thin film structure is investigated. A magnetic thin film stack is placed in the near-field of the plasmonic nanoantenna to utilize the evanescent mode coupling between the nanoantenna and magnetic thin film stack. A bow-tie nano-optical antenna is excited with a tightly focused beam of light to improve near-field radia...

This work reports a rigorous and comprehensive three-dimensional electromagnetic computation to investigate and design photoluminescence enhancement from a single silicon-vacancy center (SVC) in a nanodiamond crystal embedded in various metallic nanoantennae, each having a different geometry. The study demonstrates how each antenna design enhances the photoluminescence of SVCs in diamond. In pa...

In this paper, a single-chip impulse antenna array is presented that performs spatial combining of picosecond impulses radiated from 8 elements. A new broadband beamforming architecture is introduced that controls the timing of impulses radiated from each antenna by delaying a trigger signal, with resolution steps of 300fsec. This method eliminates the distortive and narrowband effects of delay...

The paper presents a new practical design for 4 × 1 planar switched array of dielectric filled waveguide antennas loaded with bow-tie shaped slots operating at 26.5 to 29.5 GHz 5G millimetre-wave applications. is realized as three-layered architecture, the top layer behaving radiator, bottom feed network and control circuit; common ground plane in middle layer, offering small form factor. are u...