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In this paper a novel transmission line topology partially filled with liquid crystal is investigated in terms of its usability as a high performance continuously tunable phase shifter. At first the special properties of liquid crystals are described briefly. Then theoretical results based on a developed simulation tool are discussed in order to explain the advantages of this waveguide structure compared...
This paper presents the design setup of an 4times4 array, each element consists of two Vivaldi antennas connected by an overlapped antipodal finline phase shifter. Simulations of an infinite expanded array showed a good matching in the whole investigated frequency range and fairly low insertion losses of less than 7.7 dB at 35 GHz. The phase can be continuously tuned up to 465deg. Measurement results...
This paper present the numerical modeling of transmission lines taking into account the special material properties when liquid crystals (LC) are used as steerable anisotropic dielectrics. At first a short introduction of the properties of LC is given as well as the theoretical models used for the physical simulation of LCs in terms of molecular dynamics. Then, a full wave method to analyze the electrical...
Measurement results of a tunable phase shifter using a ferroelectric liquid crystal (FLC) are presented in this work. The measurements are compared to results obtained with the same device but using a standard nematic liquid crystal (NLC) which may also be used for regular display applications. The realized device is a sandwich structure with a 23 mum thick LC layer between a fused silica and a silicon...
The nonlinear behaviour of a phase shifter employing two different nematic liquid crystals (NLCs) as a tunable dielectric is investigated in this work. The NLCs used are the quasi-standard NLC 5CB and a highly anisotropic mixture MDA-03-2844. The third order intercept point IP3 was measured at 7.4 GHz. The utilized measurement setup allows the application of 40 dBm total power to the device under...
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