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This paper describes the development of a liquid crystal (LC) controlled waveguide filter demonstrator for space application. The filter can be used in a satellite input multiplexer section (IMUX) and allows shifting the filter frequency from 19.7…20.2 GHz with 200 MHz bandwidth. The filter frequency can be controlled magnetically or electrically. The electrical field is generated by dedicated LTCC...
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 investigations conducted with tunable reflectarray unit cells based on nematic liquid crystals (LC), at frequencies around 77 GHz. The structure of the cells is presented, as well as their performance as measured in a waveguide simulator setup. Encouraging results with tunable phase ranges as high as 280?? with tuning voltages of up to 15V have been achieved. The investigated tunable...
This paper investigates the realization of reconfigurable reflectarrays based on tunable liquid crystals (LC). Two different concepts of unit cells using highly anisotropic LC have been designed and measured, showing good results and the possibility of employing them in a full-scale reflectarray. A 16 times 16 fixed beam microstrip reflectarray has been developed and measured, in order to verify the...
KONOE is a toolkit for building a data acquisition, DAQ, system which is used under a network-distributed environment with an object-oriented technology. Several major functions required for a DAQ software, are collecting, recording and monitoring experiment data, and controlling a whole system. Their functions are realized more efficiently and easily by using KONOE. KONOE, so far, has been a toolkit...
We present a new mechanism for high-energy electron acceleration in the system of inverse synchrotron radiation(ISR) and in the system of inverse bremsstlahrung(IBRMS). We perform numerical analyses and particle simulation about these mechanisms. Numerical analyses and simulations show that these mechanisms efficiently accelerate a high-energy electron.
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