Electronic Beam Steering and Polarization Agile Planar by Onur Hamza Karabey

By Onur Hamza Karabey

This booklet 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 conclusion of a two-dimensional digital beam guidance antenna and polarization agile planar antennas with lcd know-how. It offers a close description of the entire theoretical analyses, modeling and layout equipment that have been concerned with the conclusion of those units in addition to their validation utilizing size of demonstrative prototypes. This ebook additionally indicates that low profile, within your means, excessive achieve, digital beam steerage and polarization agile antennas might be fabricated in greater sizes by utilizing current computerized lcd production suggestions. The cutting edge principles and strategy defined during this paintings symbolize a substantial development within the box of electronically reconfigurable antennas according to liquid crystal know-how and are anticipated to attract major curiosity sooner or later. Such antennas could turn 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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Mueller, Grundlegende Untersuchungen steuerbarer passiver FlüssigkristallKomponenten für die Mikrowellentechnik, PhD thesis, Technische Universitaet Darmstadt, 2007. [Dem+99] D. L. Ong, Measurement of nematic liquid crystal splay and bend elastic constants with obliquely incident light. J. Appl. Phys. 70, 2023–2030 (1991) [KFN02] T. Kuki, H. Fujikake, T. Nomoto, Microwave variable delay line using dual-frequency switching-mode liquid crystal. IEEE Trans. Microw. Theory Tech. A. Balanis, Antenna Theory: Analysis and Design, 3rd edn.

In Eq. 7), μ0 and ε0 are the permeability and permittivity of free space, accordingly. The pure conductor losses can be seen in γ by a product of εr and K (see Eq. 5)). The insertion losses caused only by the conductor losses not only depend on Rs (equivalently K ), but also depend on the dielectric constant of the MUT since K is multiplied by εr . Therefore, the conductor losses have to be considered in each iteration of the optimization procedure. To do that, Rs has to be known to calculate K (see Eq.

F. K. P. V. K. 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.

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