In brief

Abstract

PAGE 524 Researchers from South Korea have developed a walking speed estimation and treadmill control algorithm for a user-driven treadmill. Data is gathered as the user walks on the treadmill wearing insole pressure sensors. The correlation between walking speed and centre of pressure was investigated to develop a feedforward scheme, ensuring speed control of the treadmill. The user-driven treadmill has applications in training, rehabilitation, sports and entertainment. PAGE 520 A microstrip antenna array (MAA) with metasurface has been designed and fabricated for ultra-wideband radar cross-section (RCS) reduction, whilst preserving its radiation characteristics. The research from China uses size-adjustable unit cells to achieve different reflection phase distributions. The proposed MAA can reduce the RCS in the ultra-wide frequency band 6.2–27.3 GHz for both x and y polarisations. Estimation of walking speed and treadmill control using data from insole pressure sensors. PAGE 538 Researchers from China mounted a dielectric lens on the topside of a silicon imaging chip to improve radiation patterns of an on-chip patch antenna. The integrated lens causes the main beam of radiation patterns to become narrower, thus achieving a finer spatial resolution for imaging applications. The technology can be applied in THz imaging. Microstrip antenna array with metasurface designed for ultra-wideband RCS. PAGE 546 A sixteenth-mode substrate integrated waveguide (SMSIW) bandpass filter loaded with complementary split-ring resonator (CSRR) is proposed by researchers from India. The SMSIW filter operates at 2.45 GHz and has a bandwidth of 8.2%. It is compact, occupying 6.25% of a conventional integrated waveguide. It is also simple, has low-loss and is easy to fabricate. Lens placed on topside of imaging chip improves radiation patterns of antenna. PAGE 568 An autofocusing imaging method for stepped frequency continuous wave ground penetrating radar (SFCW-GPR) is presented in this Letter from China. The method overcomes the uncertainty of electromagnetic wave propagation velocity in the subsurface medium, by using the sequential L0 and L2 norms minimisation technique. Compact, simple, low-loss and easy to fabricate bandpass filter. Autofocusing imaging method for SFCW-GPR.