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)
— 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(More)
In this paper we introduce a new 3D planar parameterization algorithm. After presenting a brief overview of the state of the art, we introduce a new barycentric mapping method, based on the edge length ratio preservation. Our proposed approach demonstrate higher performances with respect to all main techniques developed so far in this direction, reducing(More)
Dual-mode, meander loop filters can provide a valid solution for narrow-band, compact and cost-effective devices for mobile communications. The finite-difference time-domain (FDTD) method was employed in order to obtain an accurate filter design. For the non-reflective boundary conditions, the Bérenger perfectly-matched layer (PML) was extended to a 3-D(More)
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