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This report presents the results of design of antennas and antenna arrays for High-Precision-Localization-System. Several structures, meeting particular requirements of the system, have been designed, realized and measured. Depending on the system configuration different types of antennas have been proposed for the base stations and mobile terminals in the… (More)
In this paper, the radiation characteristics of a new microstrip electrically controllable scan antenna are investigated theoretically and experimentally. Both longitudinal and transverse currents are taken into account. The substrate of this antenna consists of a ceramic-polymer composite with modified ferroelectric powder Ba<sub>0,65… (More)
The paper concerns a system for detecting cross section of an object under test. The object is located on a revolving platform and excited with ultra short pulses. The cross section is calculated on a base of matrix constituted by the signal received coherently for different angles. Phase shift between pulses is key information in those calculations.
Genetic algorithm was used to simulate adaptation of an array in two different approaches. In the first case antenna radiation pattern is adapted through manipulation of weights on each radiating element while in the second case radiation characteristic of each element is modified with hardwareless technique.
Nowadays, radioelectronic systems employ multiple antenna systems. Reconfigurable apertures are derived from a new class of antennas, which consist of a matrix of conducting patches with switches between some or all of the patches. These reconfigurable apertures can change functionality by opening or closing different connections between these patches. An… (More)
The results of analysis and investigation of some semiconductor antennas with reconfigurable aperture have been presented in this paper. Discussed solutions have been based on the utilized semiconductor material. It allows to design the electronically reconfigurable antennas. The key element of the reconfigurable antenna is a surface PIN (SPIN) diode whose… (More)
In the article three different photonic Remote Antenna Units (RAU) in the last mile Wireless over Fiber links are presented. For construction of RAU commercially available optoelectronic devices were used. The solutions differ from each other by the method of ensuring isolation between transmitting and receiving modes of operation. All RAUs were designed,… (More)
This paper reports a range of experience gained during application of Novelda impulse transceiver module in an ultra-wideband radar system. The paper describes the specific data acquisition procedure performed by the transceiver module. The external radio frequency (RF) circuit is proposed, which provides improved detection capability of the radar system.… (More)
— In this paper, a computer simulation of a MIMO system comprising phased array antennas (PAA) in all receiving branches is presented. In order to examine the system performance under relatively realistic conditions, a ray-tracing simulator was applied to generate a baseband channel impulse response matrix H H H. A bit error rate (BER) of two systems… (More)
In this paper, new method of pattern synthesis of antenna arrays without phase shifters and attenuators has been presented. This concept is based on utilizing voltage-controlled ferroelectric array, where variable pattern of each antenna element is used to synthesize array pattern.