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 belief of a two-dimensional digital beam guidance antenna and polarization agile planar antennas with lcd know-how. It supplies an in depth description of the entire theoretical analyses, modeling and layout equipment that have been fascinated about the conclusion of those units in addition to their validation utilizing size of demonstrative prototypes. This e-book additionally indicates that low profile, comparatively cheap, excessive achieve, digital beam guidance and polarization agile antennas may be fabricated in greater sizes by utilizing latest computerized lcd production concepts. The cutting edge principles and procedure defined during this paintings symbolize a substantial development within the box of electronically reconfigurable antennas in response to liquid crystal know-how and are anticipated to attract major curiosity sooner or later. Such antennas could develop into vital, for instance, in cellular terminals built-in into the physique of laptops (in the canopy) or of autos (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
2 Parameter Extraction Extraction algorithms can be grouped into two as: Point-by-point and multi-point for this method [BJ+93]. Nicolson-Ross-Weir (NRW) [NR70, Wei74] method is a typical example, indeed forms a basis, for the point-by-point extraction techniques. This method works properly except for the frequencies, where the physical length of the line is equal to multiple of the half wavelength. At these frequencies, extracted results diverge because the phases of reflection coefficients can not be measured accurately, especially for low-loss materials [BJ+93].
Pdf [SCHd] SCHOTT. pdf [Sei+01] W. Seifert, M. Ueltzen, C. Strumpel, W. Heiliger, E. Muller, One-dimensional modeling of a peltier element, in Proceedings of XX International Conference on Thermoelectrics ICT 2001, pp. E. Sernelius, Electrodynamics, TFYY67, NFYD70. B. Weir, Automatic measurement of complex dielectric constant and permeability at microwave frequencies. Proc. Y. F. Audeh, Cutoff frequencies of eccentric waveguides. IEEE Trans. Microw. TheoryTech. 14(10), 487–493 (1966) Chapter 4 2D Electronic Beam Steering Phased Array Phased arrays are one of the well-known types of beam steering antennas.
In particular, no phase transition is detected from 10 to 60 ◦ C. These results clearly show the temperature range for the nematic phases are extended for the microwave LCs compared to the results published in [Mue07]. 1 Broadband Microwave Characterization of Liquid Crystals 37 (a) (b) Fig. 9 Extracted relative permittivity εr and loss tangent tan δ of GT3-23001 versus frequency f and temperature T This is accomplished by doping functional materials into host LC materials [Goe09]. 10 shows two essential material parameters, which are the material tunability τLC = (εr,LC, − εr,LC,⊥ )/εr,LC, and the material efficiency ηLC = τLC / tan δ⊥ (see Sect.