2002 International Telecommunications Symposium

"This report is devoted to investigation of the new class of atomic-fractal functions and their applications in problems of antenna synthesis."

"This paper discusses a new microstrip antenna array for wireless communication. Initially, the basic array element, an E-shaped probe-fed patch, is analyzed by comparisons between numerical and measured results. After that, a two-element subarray is discussed. Simulated results, obtained by using Ensemble 8.0™ and IE3D™ packages, and experimental ones...

"This paper presents a performance analysis of two linear arrays structures considering the effect of excitation coefficients and random separation between elements. The results obtained show that these configurations can produce good radiation patterns in terms of side lobes level and directivity. Depending on the chosen parameters the irradiation...

"This paper presents an intelligent system for interference signals cancelling in a linear antennas array. The method combines Blind Source Separation a modular structure formed by radial basis functions neural networks− MRBF that estimates the AOA− Angle of Arrival of the multiple independent incident signals on the sensors array and supplies these...

"This paper presents a monolithic voltage-controlled oscillator with static frequency divider in a pre-production 0.4 \u00b5m SiGe bipolar technology for broadband communication applications. The voltage-controlled oscillator operates from 17.8 GHz to 25 GHz. The division ratio of the static frequency divider is 16. The circuit consumes 500 mW from the 5...

"This paper describes a CMOS RF Single Pole Double Through (SPDT) switch used in the front-end of a transceiver. Its topology is based on the association of an active quasi-circulator and an RF Single Pole Single Through (SPST) Switch."

"The Finite-Difference Time-Domain (FDTD) method to calculate the cellular phone far and near field and the specific absorption rate (SAR) in the user\u2019s head is described. The conventional \u03bb/4 monopole and a simple planar antenna are simulated. A multidimensional grid is developed to optimize simulations in the near and in the far field, in the...

"This work deals with the study of genetic algorithms in the determination of the directions of arrival of incident signals in linear arrays of antennas. For such, techniques of spectral esteem are used to define a spectral density function. To leave of this function the development of genetic algorithms becomes possible that will go to determine the...

"The adaptive antenna theory has been studied in several application fields such as radar, sonar, mobile communications, geophysics exploitation, etc. In all these cases, the different methods used to solve problems in the adaptive antenna approach generally use the same procedure, which is related to the increasing of the directivity of the antenna...

"A completely integrated 16 GHz static 4:1 frequency divider in 120 nm CMOS is presented. The divider operates up to 16 GHz and features an enhanced input sensitivity of 0 dBm over a broad input band of 14 GHz. The circuit draws 60 mA from a single 1.5 V supply. To drive 50 \u03a9 loads up to 4 GHz, an output buffer is also included in the divider circuit."