MEMS technology can be used to implement high quality switches, varactors (variable reactors), inductors, resonators, filters and phase shifters. Among the broad range of applications the MEMS technology gives a unique possibility to implement micromechanical resonatores and filters with high performance regarding selectivity and Q-factors. When combining these mechanical structures with microelectronics, central parts in wireless systems, RF systems (Radio Frequency systems) can be implemented.
A metamaterial (or meta material) is a material that gains its properties from its structure rather than directly from its composition. This term is particularly used when the material has properties not found in naturally-formed substances. The term was coined by Rodger M. Walser of the University of Texas at Austin in 1999, and metamaterials were defined by him in 2002 as follows: macroscopic composites having a manmade, three-dimensional, periodic cellular architecture designed to produce an optimized combination, not available in nature, of two or more responses to specific excitation. [Wikipedia]
With the recent explosive growth of the Telecommunications industry, research in this field has taken on critical importance. The major issues being investigated are higher levels of integration, lower power designs, and lower cost solutions. These issues are being addressed in a number of ways, and with several different technologies. Current research is in the area of design of Mixers, Power Amplifiers (PAs), Low Noise Amplifiers (LNAs), requency Synthesizers, Intermediate Frequency circuits (IF), and Baseband circuits. [Wikipedia]
Power amplifier fabricated using 0.24um CMOS technology
Electromagnetic Compatibility (EMC)
Electromagnetic compatibility (EMC) is the branch of electrical sciences which studies the unintentional generation, propagation and reception of electromagnetic energy with reference to the unwanted effects that such energy may induce. To this purpose, the goal of EMC is the correct operation, in the same electromagnetic environment, of different equipment which use electromagnetic phenomena.
In order to achieve such an objective, EMC pursues two different kinds of issues: emission issues are related to the reduction of unintentional generation of electromagnetical energy and/or to the countermeasures which should be taken in order to avoid the propagation of such an energy towards the external environment. Susceptibility or immunity issues, in contrast, refer to the correct operation of electrical equipment in the presence of electromagnetic disturbances.
Noise mitigation and hence electromagnetic compatibility is achieved by addressing both emission and susceptibility issues, i.e., quieting the sources of interference, making the disturbance propagation path less efficient, and making the potentially victim systems less vulnerable.
When the propagation of electromagnetic disturbances in guiding structures, i.e. conductors, transmission lines, wires, cables, printed circuit board (PCB) traces, is by a guided propagation mechanism, conducted emission and susceptibility issues are considered. On the other hand, when open-space propagation of electromagnetic disturbances is addressed, the point of focus becomes radiated emission and susceptibility phenomena. [Wikipedia]
Investigation of Bragg and Non-Bragg gaps in periodically Corrugated Waveguide