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|Title||Coupled Resonator Diplexer for LTE-Advanced System|
This thesis presents the design of a microstrip hairpin diplexer. The design is based on coupled-resonator structure using U-Shaped resonators. It is designed to meet The Long Term Evolution-Advanced (LTE-A) system Band 7, operation at uplink (UL): 2.50–2.57 GHz and downlink (DL): 2.62–2.69 GHz for base transceiver station antenna. The structure consists of three ports 10-coupled resonators with direct coupling to produce diplexer with chebyshev filtering response. The diplexer does not involve any external junctions for distribution of energy, so it can be miniaturized in comparison to conventional diplexers. The synthesis procedure of the proposed coupled-resonator diplexer is based on optimization of coupling matrix. The optimization algorithm is based on minimizing a cost function that is formulated with a minimum set of characteristics that can completely describe the response. Both unconstrained and constrained local optimization techniques have been utilized to synthesise the coupling matrix, and a numerical formula has been used to calculate the external quality factors of the diplexer with symmetrical channels. A local gradient based optimization technique has been employed here to produce coupling matrix for the coupled resonator diplexer. EM simulator (CST Microwave studio) has been used to extract the desired design dimensions according to a prescribed diplexer design parameters. Global and local optimization techniques are applied to whole structure to improve the initial response.
|Publisher||الجامعة الإسلامية - غزة|
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