Electronic Beam Steering and Polarization Agile Planar by Onur Hamza Karabey
By Onur Hamza Karabey
This publication describes the characterization of liquid crystal fabrics at microwave frequencies and the use of those fabrics in reconfigurable planar antennas and of their electric tunable elements. It experiences for the 1st time the belief of a two-dimensional digital beam steerage 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 enthusiastic about the belief of those units in addition to their validation utilizing dimension of demonstrative prototypes. This e-book additionally exhibits that low profile, budget friendly, excessive achieve, digital beam guidance and polarization agile antennas will be fabricated in greater sizes through the use of present automatic lcd production suggestions. The cutting edge principles and strategy defined during this paintings signify a substantial development within the box of electronically reconfigurable antennas in keeping with liquid crystal know-how and are anticipated to attract major curiosity sooner or later. Such antennas may perhaps develop into very important, for instance, in cellular terminals built-in into the physique of laptops (in the canopy) or of cars (in the rooftop), ships or boats, for which flat, low-profile and reasonably cheap antennas are required.
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Extra resources for Electronic Beam Steering and Polarization Agile Planar Antennas in Liquid Crystal Technology
Sample text
An electrostatic field is introduced by applying a bias voltage Vb across the inner and outer conductors. This aligns the molecules parallel to the electrical field of the coaxial line E and so the parallel complex relative permittivity of the LC material εr,LC, is effective. The magnetostatic field, on the other hand, is applied along the line to align the molecules perpendicular to the E-field. As a result εr,LC,⊥ is effective. The magnetostatic field is obtained by using permanent ring magnets surrounding the split block.
B The molecus are aligned as equilibrium between the applied field and the anchoring force of the alignment layer (Vb > Vth and εr,eff,⊥ < εr,eff < εr,eff, ). c The LC molecules are oriented parallel to the electric field of the IMSL (Vb > Vsat and εr,eff = εr,eff, ) The director can be realigned by applying an external bias voltage Vb across the signal and the ground electrodes (see Sect. 2). However, the surface anchoring resists to the realignment caused by the electrical field [YW06]. Only after a threshold voltage is exceeded the molecules are realigned as equilibrium between the applied field and the anchoring force of the alignment layer.
Methods reducing the fringing field are presented in Sect. 1. Nonetheless, the corresponding complex perpendicular effective permittivity εr,eff,⊥ is mainly defined by εr,⊥ . LC Layer Front Glass + - Vb RF Back Glass (a) + - (b) Vb (c) Fig. 5 Cross-sectional views of the variable IMSL. a The LC molecules are parallel to the surface (εr,eff = εr,eff,⊥ ) and perpendicular to the radio frequency (RF) field. b The molecus are aligned as equilibrium between the applied field and the anchoring force of the alignment layer (Vb > Vth and εr,eff,⊥ < εr,eff < εr,eff, ).