![]() The research and development efforts put into exploiting planar circuits show their potential qualities of low cost, tiny weight and high integration degree. ![]() ![]() A perfect topology would be the one satisfying all drastic requirements, particularly, system performance, size, and manufacturing cost. Finally, we discussed follow-up to give to this work and outlooks.ĭue to the fast expansion of modern microwave communication systems, more and stronger constraints are being imposed on RF systems. The first one is a center frequency tunable bandpass two pole open loop filter and the second one is a center frequency and bandwidth tunable SIR bandpass filter using varactor diodes. In a second part, our work focused on the realization of tunable planar filters based on KTN materials and varactor diodes. Despite results highlighting a slight advantage to BST solution, KTN material, after optimization process, could be a BST alternative solution. Their performances were then compared with BST solution. Then, we designed basic microwave devices such as interdigitated capacitors and phase shifters based on KTN thin films. ![]() In this way, we initially characterized KTN material in low and high frequency to determine its dielectric properties and characteristics according to the temperature. The first part of our study deals with the optimization of tunable microwave devices based on KTN ferroelectric thin films. Within the scope of this thesis work, our investigations focused on tunable microwave devices optimization through the use of KTN ferroelectric thin films and varactor diodes. In this way, three main technologies are mainly used: variable capacitors, tunable materials and RF MEMS. The use of tunable microwave functions (filters, switches, amplifiers. The miniaturization of these devices combined with the implementation of additional functions has become a real challenge for the industry. The rapid growth of the telecommunications industry has led to a significant increase in the number of allocated frequency bands and a growing need for terminals providing access to an increasing number of standards while offering maximum services. ![]()
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