The simulated characterisation and tuning of prototype antennas prior to manufacture is described in this study. The antennas incorporate Schottky diodes so as to frequency triple incident sub-THz power. Such a dual frequency, non-linear, device has been called a multenna. A metrology is outlined for ease of multiple measurements to permit exploring scenarios of multenna element design. Four options are optimally oriented and assembled onto an appropriately dimensioned tile substrate to minimise mutual coupling during characterisation of each element individually. Transmission measurements of the multennas are performed at 100 and 300 GHz: an example of resonant behaviour is presented. [ABSTRACT FROM AUTHOR]
IET Control Theory & Applications. May2012, Vol. 6 Issue 8, p1055-1063. 9p. 2 Black and White Photographs, 5 Diagrams, 3 Charts, 1 Graph.
INTEGRATED circuits, COMPUTER programmers, MATHEMATICAL models, FIELD programmable gate arrays, PREDICTIVE control systems, EMBEDDED computer systems, COMPUTER simulation, and QUADRATIC programming
To improve the on-line computational performance of model predictive control (MPC) for fast systems and/or embedded systems, this study proposes a novel scheme for the MPC controller implementation based on field programmable gate array (FPGA) and system on a programmable chip (SOPC) technology. A Nios II processor clocked at 150 MHz is embedded into the FPGA chip. A C/C++ model of the MPC algorithm which is run in the Nios II processor is created. The dual method is adopted to solve the quadratic programming (QP) problem. Based on FPGA and dSPACE®, a rapid prototyping platform is introduced to test and verify the function and computational performance of the MPC controller. Real-time simulation results of controlling a throttle model show that a reasonable size of constrained MPC controller can be implemented on the used RCIII FPGA board. [ABSTRACT FROM AUTHOR]