In brief

Abstract

PAGE 1534 Work from Canada presents the fabrication of a simultaneous multi-channel microwave chirped waveform generator. The waveguide design consists of an arrayed grating interferometer and linearly chirped fibre Bragg grating. Device tunability, flexibility and reconfigurability within the central frequency microwave bandwidth are demonstrated by the generation of two independent chirped waveforms. PAGE 1537 A distributed Bragg reflector-free semiconductor disc laser capable of 10 W continuous wave output at 1007 nm, has been created by researchers in Finland, Germany and the UK. The laser is formed of InGaAs quantum wells and GaAsP barrier layers that are bonded through non-covalent interactions to a SiC intra-cavity. The laser output wavelength beam can be tuned from 995 nm to 1020 nm with low optical loss. Simultaneous multi-channel microwave waveguide with tunable central frequency chirped waveform generation. PAGE 1506 Researchers in China report a wireless ingestible capsule topology for non-invasive gastrointestinal tract disease diagnosis. The proposed MIMO antenna capsule consists of two loop elements placed in an orthogonal orientation to achieve different polarisation directions. Simulated and measured transmission frequencies are shown to be within the industrial, scientific and medical bandwidth. A reflector-free semiconductor laser that can be tuned across a broad range of optical wavelengths. PAGE 1502 A miniaturised hexagonal ring frequency selective surface is proposed in work from China. The reported surface is 2.5-dimensional and achieves ultra-wide bandwidth transmission with good polarisation-independent performance. Simulated results are confirmed by prototype fabrication and the surface is shown to be suitable for both S- and C- band communication systems. A MIMO antenna with two loop elements for medical diagnosis applications. PAGE 1518 Researchers in China report the mechanisms of secondary discharge in electronic devices. The voltage, switch gap material, geometry and humidity are all parameters that are found to influence the secondary discharge current, which occurs when applied voltages are higher than the threshold voltage. The secondary discharge current is also found to significantly vary, leading to unpredictable electronic equipment failure events. S- and C- band communication achieved by a miniaturised hexagonal ring frequency selective surface. Revealing the mechanisms underlying secondary discharge in mobile electronic devices.