Michael T. Chryssomallis

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Microstrip antennas are widely used due to their low profile, light weight and conformal nature. They are utilized in many applications abound from HF through 5.8 GHz ISM band frequencies. Moreover, the advance in the electronic technology leads to an extensive decrease in the overall size of the electronic parts leading to miniature communication systems(More)
A spatial smoothing preprocessing scheme for solving problems encountered in direction-of-arrival estimation of fully correlated signals is analyzed. Simulation results are presented, that illustrate this scheme in comparison with the classical MUSIC technique. Finally, an improved spatial smoothing algorithm, which has the ability to detect more coherent(More)
An eigenanalysis-based technique is presented for the study and design of large complicated closed cavities and particularly Reverberation Chambers, including conductor and dielectric material losses. Two different numerical approaches are exploited. First, a straightforward approach is adopted where the finite walls conductivity is incorporated into the(More)
A new printed antenna model, the “cactus-antenna” is presented and discussed. The antenna consists of a printed monopole with one or two sleeves attached to each side. Switches are used to control the lengths of the monopole and the length of each sleeve to tune the first and the second resonant frequency of the antenna respectively. In the case of the(More)
This work presents an application of a geometry based model for the simulation of a common mobile telephony channel case. All critical parameters of the model are computed such as the Time-Of-Arrival (TOA), the Angle-OfArrival (AOA), the Angle-Of-Departure (AOD) and the received power of multipath components, in order to take decisions for using directional(More)
The goal of this paper is to investigate the performance of MIMO-WCDMA networks, where Principal Component Analysis (PCA) is employed at the reception. Multipath propagation is exploited, as the individual received signals can be seen as different instances of the same physical phenomenon (i.e. transmission and reception of WCDMA sequences). In this(More)
The technique of multiple points feeding in order to achieve improved bandwidth performance is here exploited and used to feed a supershape structured radiator. The achieved operating bandwidth, is an important advancement compared to the performance of the usual, single fed and regularly shaped patch antennas. The proposed antenna operates from 2.5 to 3.9(More)
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