By Onur Hamza Karabey
This ebook describes the characterization of liquid crystal fabrics at microwave frequencies and using those fabrics in reconfigurable planar antennas and of their electric tunable elements. It studies for the 1st time the belief of a two-dimensional digital beam guidance antenna and polarization agile planar antennas with lcd know-how. It provides a close description of all of the theoretical analyses, modeling and layout equipment that have been taken with the conclusion of those units in addition to their validation utilizing dimension of demonstrative prototypes. This e-book additionally exhibits that low profile, within your means, excessive achieve, digital beam guidance and polarization agile antennas could be fabricated in higher sizes through the use of latest automatic lcd production concepts. The leading edge rules and technique defined during this paintings characterize a substantial development within the box of electronically reconfigurable antennas in line with liquid crystal know-how and are anticipated to attract major curiosity sooner or later. Such antennas may perhaps develop into vital, for instance, in cellular terminals built-in into the physique of laptops (in the canopy) or of vehicles (in the rooftop), ships or boats, for which flat, low-profile and inexpensive antennas are required.
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Additional resources for Electronic Beam Steering and Polarization Agile Planar Antennas in Liquid Crystal Technology
J. D. ), Microwave Measurements, 3rd edn. (IET Electrical Measurement Series) (The Institution of Engineering and Technology, London, 2007) [DLC08] X. Dong, L. Mai, X. Chen, Computation of the characteristic impedance of eccentric coaxial transmission lines by boundary element method, in Proceedings of World Automation Congress WAC, 2008, pp. 1–5, 2008 [D26] D263 T borosilicate thin glass. R. Eisenstadt, Y. Eo, S-parameter-based ic interconnect transmission line characterization. IEEE Trans. Compon.
Any kind of local or complete change in the direction of n increases the energy of the system, which is formulated by the Gibbs free type of energy. The system achieves a equilibrium state when the Gibbs free energy has its minimum at constant temperature and pressure [YW06]. This also means that if the system’s energy is increased, the molecular orientation (and n) changes to find a new equilibrium state, resulting in again a minimum free energy. The factors having impact on the system’s energy are elastic deformations, external electromagnetic fields and anchoring effects.
The eccentric coaxial lines are assigned to be infinitesimally short with a physical length of physical to enhance the modelling accuracy. Electrical properties of the eccentric coaxial lines can be calculated by using either numerical formulas [YA66] or analytical formulas [MS88, Kra99, Ser06], which transforms the given geometry into another one. In this work, the conformal mapping technique is utilized. As illustrated in Fig. 4, the eccentric coaxial lines are mapped onto the concentric ones by using [Ser06] w= z−a .