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In this paper, we focus on multiple antenna-systems for portable UMTS devices. First, we perform a state-of-the art review of the best solutions developed all around the world. Then, we present all the UMTS multi-antenna systems designed at the LEAT of the University of Nice-Sophia Antipolis since 2004. We especially describe the neutralization technique dedicated to enhance the total efficiency of...
In this paper, the carrier-power dependence of the PIM products generated in microstrip and coplanar waveguide transmission lines is investigated experimentally. Both simultaneous and independent tuning of the power levels of two fundamental carriers is used. Saturating behaviour of the PIM products at higher carrier power and local minima of PIM products in the two-carrier power domain are observed...
Left-handed microstrip delay lines implemented by Complementary Split Ring Resonators (CSRRs) have been designed, fabricated and tested. The measured results reveal that the left-handed microstrip CSRRs can realize much longer delay in time as compared to conventional transmission lines for the same lengths. In this paper, for the length of 96 mm, a 12-cell CSRRs can provide the highest delay approximately...
In this paper a measure of distortion in propagation of electromagnetic wave which results from frequency dependence of attenuation constant and non-linear phase constant in microwave transmission line is presented as correlation of the reference signal and the distorted signal. By taking the Fourier series of a particular pulse train and then taking the sum of first few dominant components that contain...
A decoupling network for improving the isolation between two highly coupled antennas is proposed. In this method the input signals are combined linearly so that the mutual coupling between the ports becomes zero. The scattering matrix of the network is found using a mathematical procedure and has been demonstrated in this paper for a previously developed integrated wide/narrow band antenna. For this...
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