Teodor Petrescu

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A new topology for fourth-order microstrip bandpass filters is investigated in this paper. Compared to the classical quadruplet, the proposed new topology offers an extra coupling between two resonators, allowing this way the design of fourth order filters with two attenuation poles situated on the same side of the passband. A strongly asymmetric transfer(More)
We have previously proposed an indoor measuring technique for antenna gain, based on averaging a normalized transfer function over a distance range. Simulated and measured results have also been presented, in order to validate the method. In this paper, we assess the accuracy of our method by comparing the results to those issued from a traditional,(More)
În acest articol este implementat un nou algoritm de parametrizare plană. După o scurtă prezentare a cercetărilor actuale în acest domeniu, este descrisă noua noastră metodă de mapare baricentrică, bazată pe conservarea rapoartelor de lungimi între muchiile modelelor 3D. Rezultatele obţinute prin implementarea algoritmului propus certifică superioritatea(More)
This article presents different electromagnetic irradiation scenarios of a heterogeneous human heart placed in the field emitted by a dipole antenna. An anatomical model of the human heart was proposed. Specific absorption rates were calculated using a numerical software based on the finite difference time domain method. Several positions and frequencies(More)
Simple, compact low-cost microwave bandpass filters with strongly asymmetric characteristics, based on new topologies, are investigated, designed, fabricated and measured. A classical fourth-order filter or quadruplet, for example, has two transmission zeros located symmetrically, one on each side of the passband. A filter of the same order and,(More)
Morphing methods are today extensively used in computer graphics to simulate the<lb>transformation between two completely different objects or to create new shapes by a<lb>combination of other existing shapes. It has a variety of applications ranging from special<lb>effects in film industry and other visual arts to medical imaging and scientific purposes.(More)
The area of underground radio technology represents a constant problem among radio communication systems. This paper aims to suggest a possible scenario for transmission/receiving of signals from a salt mine. It is assumed that the system used is a synchronous CDMA system and the users' signals have equal powers. In order for the performances to be improved(More)
This paper presents a synthesis approach based on a variable slope profile. The method is demonstrated by synthesizing an antenna with a quasi-constant gain over a given frequency range. The antenna configuration resulting from synthesis was simulated, manufactured and measured in order to validate our method.
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