This article describes the design of a local GSM signal amplifying system and presents the results of appliance performance measurements, simulations and analyses. The system consists of a receiving antenna of the Yagi type, a 50 Ω cable, a 0.5–1.5 GHz wideband RF amplifier and a transmitting antenna. A precise measurement of the S-parameters of each component is performed and recorded in the appropriate S-matrix data file format. The amplifying system is first realized in a Keysight Genesys programming simulation platform with S-models, created based on the measured data. That schematic is simulated and optimized by calculating additional impedance-matching circuits included in the initial schematic design.

Among the critically important conditions for optimal mobile device power source efficiency, ensuring reliable and long-term operation, is the matching of the output impedance of the radio transmitter with that of the antenna used. A step forward in the development of technology for the implementation of high-quality radio frequency radiation with minimal energy losses in telecommunications equipment could be devices that automatically match the output impedance of radio transmitters designed for high frequencies such as VHF and UHF. What has been achieved to date and implemented in the serial production of telecommunications equipment and in the majority of explorations is relatively optimized impedance matching between the output of the final amplifier stage and the transmitting antenna for a relatively wider frequency bandwidth. This leads to a significant deterioration in the transmission efficiency of some frequencies of the digital signal spectrum and a decrease in the data transfer rate. This publication presents the development and simulation of suitable elements for the implementation of automated impedance matching circuits.

This paper presents an exploration of the electromagnetic field characteristics and parameters in the area of coverage of a particular base station, as well as the radio signal strength and the data speed values for optimal service. Although there are many investigations concerning the influence of the electromagnetic field on the reactions of the people positioned in such areas and general impact on humans’ health, it is worth exploring some specific aspects of that problem. One of them is to focus the investigation on some particular radio frequency ranges. The second is to propose some practical consequences of the steps and ways to perform the measurements, with fast opportunity to collect the results and to compare them with identical measurements performed by different equipment or different algorithms for measurements. As a consequence, approaches should be developed to allow relatively accurate measurements of the electromagnetic background with devices more accessible to ordinary people instead of the expensive specialized measuring instruments used by specialists in this field. Such alternative methods of control of the electromagnetic flux radiation could help reliably to update the permissible parameters set in the existing regulations.

The subject of this publication is a synthesized description of an S-parameter linear analysis for the improvement of a particular RF amplifier. The model is applied in a simulation environment as a 100–500 MHz two-port device under test with control of the input and output impedance of the RF amplifier. The main goal of the exploration is to achieve a near-perfect impedance match in the input and output stages of a particular RF amplifying schematic. For that purpose, a computing sub-application was created and used in the simulation environment of Keysight Genesys. An appropriate sweep of the parameters’ values of the respective elements of the schematic allows simultaneous changes of the working point position on the diagrams corresponding to the maximum efficient operating mode of the amplifier for the operating frequency range. The upgrade of the initial schematic design usually achieves much better performance and overall behavior of the RF amplifiers from the perspective of the optimum gain and efficiency.

The quality of RF signal coverage of mobile networks, and for example, the parameters of LTE signals at many places, is not reliable enough for intensive data transfer. This fact causes mobile service customers to look for and to apply additional local devices or systems for amplification of the initially supplied RF signal level to improve the quality of the service. This local improvement covers a small area around the customer’s residence. This paper shares some useful results of design, analyses, and optimization for effective performance of the tranceiving antenna for LTE (4G) signals.