A fast directional switch (FADIS) is described, which allows controlled switching of high-power microwaves between two outputs. A possible application could be synchronous stabilization of neoclassical tearing modes (NTM). Generally, the device can be used to share the installed EC power between different types of launchers or different applications (e.g. in ITER, midplane / upper launcher). Th...

AC conversion has a huge variety of applications and so there are many ongoing research topics as in every type of power electronic conversion. New semiconductors allow the increase of the switching frequency fact that brings a whole new prospective improvement in converter’s operation. Many other possible nonlinear operation regimes, including period doubling and chaotic oscillations, appear b...

In this paper, properties of reflection phase in one-dimensional quaternary photonic crystals combining dispersive meta-materials and positive index materials are investigated by transfer matrix method. Two omnidirectional band gaps are located in the band structure of considered structure. However, we limit our studies to the frequency range of the second wide band gap. We observe that the val...

Interpolated band stop FIR filters are excluded. A block diagram of an interpolated filter for odd spectral regions is proposed. The use the proposed maximum allowable value coefficient in comparison with reference calculated by classical method, namely quantitative limitation to computing resource. For structure, relations obtained determine computational efficiency and increase number registe...

This letter presents a switchable frequency-selective rasorber (SFSR) with two operating modes. Switching from transmission to reflection can be achieved by appropriately adding feeders and PIN diodes based on cascaded two-dimensional lossy lossless surface screens. The proposed SFSR realize out-of-band absorption. Analysis of the equivalent circuit model useful for achieving rasorber. As state...

In conventional frequency hopping the entire available frequency band is divided into N subbands (following the terminology used in (Zigangirov, 2004) we shall further on refer to the set of all subbands available to the user as a hopset.). Each user’s transmitter chooses one of the N subbands in a pseudorandom manner and transmits a signal via the chosen subband using a conventional modulation...

Wireless sensor networks have been proposed as a cost effective and easy to deploy alternative to traditional wired systems in a multitude of application scenarios ranging from industrial automation to healthcare monitoring. They are expected to enable an unparalleled number of new services that will bring countless benefits to society. However, low power communications of sensor nodes operatin...

Article Info ABSTRACT Article history: Received Jan 12, 2017 Revised Jun 7, 2017 Accepted Aug 11, 2017 The article presents a miniature antenna with a simple geometry and a simple approach for reconfiguration. In order to make the T-shaped antenna frequency reconfigurable, we integrated Switches in specific positions. The location of the switches is determined following a study of the distribut...

A 1 V low voltage delta-sigma fractional-N frequency divider for multi-band (780/868/915 MHz and 2.4 GHz) WSN frequency synthesizers is presented. The frequency divider consists of a dual-modulus prescaler, a pulse-swallow counter and a delta-sigma modulator. The high-speed and low-voltage phase-switching dualmodulus prescaler is used in the frequency divider. Low threshold voltage transistors ...