Angelina Markina

Bio: Angelina Markina is an academic researcher from Kazan Federal University. The author has contributed to research in topics: Microstrip antenna & Microstrip. The author has an hindex of 4, co-authored 14 publications receiving 45 citations.

On electrical characteristics of comb-shaped microstrip antennas

Abstract: The microstrip antennas with symmetrical comb-shaped radiator are considered. The influence of depth of the cuts on main electrical characteristics of four- and eight-comb antennas is researched. The resonance frequency, the bandwidth and reflection coefficient are chosen as characteristics. The graphs of unknown dependencies are constructed for the two basic frequencies.

Fast method for designing a well-matched symmetrical four-tooth-shaped microstrip antenna for Wi-Fi applications

Abstract: The problem of fast designing of a well-matched symmetrical four-tooth-shaped microstrip antenna at frequency of 2.44 GHz is considered. To solve the problem, we use regression models for wavelength, resistance and bandwidth. The optimization problem for finding the geometrical parameters of the antenna radiator is formulated by using these models. In the first step of approximation, the antenna is obtained as a solution to the optimization problem. In the next step, the geometry of the radiator is refined so as the base frequency of the antenna is closer to 2.44 GHz.

Application Of Correlation And Regression Analysis To Designing Antennas

Abstract: We consider a family of Koch-type wire dipoles with arm geometry similar to the first-order Koch pre-fractal and microstrip antennas with a radiator having a symmetric four-comb-shape profile. The selection of wire antennas is constructed by changing the position of the central vertex of the Koch-type pre-fractal of the first order. The selection of microstrip antennas is constructed by changing the width, depth, and length of the cutouts of the radiator. For these antenna samples, the basic characteristics describing the geometry of the antennas are determined. The application of correlation and regression analysis to the modeling of these types of antennas is considered. Based on the correlation relationships, the main geometric parameters of wire and microstrip antennas are revealed, which most strongly affect such electrodynamic characteristics of antennas as the base frequency, reflection coefficient, bandwidth, reactance and resistance. Correlation tables of electrodynamic and geometric characteristics and correlative diagrams are presented, with the aid of which linear and nonlinear regression models are constructed. For the given models, the mean square and mean relative errors are calculated. We indicate that on the basis of regression models, it is possible to carry out the synthesis of a wire and microstrip antennas with the corresponding predetermined properties.

Designing the Four-Tooth-Shaped Microstrip Antenna for Wi-Fi Applications

Abstract: A monopole microstrip antenna with the radiator having two pairs of rectangular teeth of different sizes is considered. The influence of the size of the teeth and the position of the cutouts between them on the electrodynamic characteristics of the antenna at the first and second resonance frequencies is studied. Based on the results of the analysis, the approach is proposed to optimize the electrodynamic characteristics of this antenna type for given parameters. The practical application of this approach in the designing the four-tooth-shaped dual-band antenna for Wi-Fi applications is shown.

Designing the Symmetrical Eight-Tooth-Shaped Microstrip Antenna for Wi-Fi Applications

Abstract: The problem of designing a symmetrical eight-tooth-shaped microstrip dual-band Wi-Fi antenna (2.4 GHz and 5 GHz) is considered. At the first stage of antenna design, numerical experiments are performed to determine the dependence of values of the first two resonance frequencies of the antenna and the corresponding bandwidths on the geometric parameters of the radiator. A regression analysis is carried out and regression models for resonance frequencies are obtained. The absolute and relative errors for the models are calculated. A family of Wi-Fi dual-band antennas with a certain ratio of length to depth of rectangular cutouts of the radiator is selected by analyzing the models. Further analysis of the matching and of the bandwidth for the antennas from the obtained family allows determining the best matched Wi-Fi antennas.

I and i

Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

Design of Miniaturized Antenna Using Corrugated Microstrip

Abstract: We present a new method to design miniaturized antennas using a corrugated microstrip (CM) line, which shows good slow wave characteristic in the required frequency band. To achieve good radiating behavior and low profile simultaneously, CM is employed as the resonating part of the antenna. The impact of the CM propagation constant on the antenna is discussed in detail. The miniaturized antenna is designed and measured to verify the feasibility of the design method. The measured results show that the proposed antenna can achieve a beamwidth of 70° in E-plane and 75° in H-plane with a gain tolerance of 3 dB, and the realized peak gain level at the central frequency is 5.15 dBi, which have good agreements to the expected designs. Such results indicate that the proposed antenna exhibits excellent radiation characteristics at the resonant mode. The effective size of the proposed miniaturized antenna is $0.16\lambda _{0}\times 0.16 \lambda _{0}\times 0.04 \lambda _{0}$ at 9 GHz, in which $\lambda _{0}$ is the wavelength of the central frequency.

Miniaturization of a Koch-Type Fractal Antenna for Wi-Fi Applications

Abstract: Koch-type wire dipole antennas are considered herein. In the case of a first-order prefractal, such antennas differ from a Koch-type dipole by the position of the central vertex of the dipole arm. Earlier, we investigated the dependence of the base frequency for different antenna scales for an arm in the form of a first-order prefractal. In this paper, dipoles for second-order prefractals are considered. The dependence of the base frequency and the reflection coefficient on the dipole wire length and scale is analyzed. It is shown that it is possible to distinguish a family of antennas operating at a given (identical) base frequency. The same length of a Koch-type curve can be obtained with different coordinates of the central vertex. This allows for obtaining numerous antennas with various scales and geometries of the arm. An algorithm for obtaining small antennas for Wi-Fi applications is proposed. Two antennas were obtained: an antenna with the smallest linear dimensions and a minimum antenna for a given reflection coefficient.

Fast method for designing a well-matched symmetrical four-tooth-shaped microstrip antenna for Wi-Fi applications

Abstract: The problem of fast designing of a well-matched symmetrical four-tooth-shaped microstrip antenna at frequency of 2.44 GHz is considered. To solve the problem, we use regression models for wavelength, resistance and bandwidth. The optimization problem for finding the geometrical parameters of the antenna radiator is formulated by using these models. In the first step of approximation, the antenna is obtained as a solution to the optimization problem. In the next step, the geometry of the radiator is refined so as the base frequency of the antenna is closer to 2.44 GHz.

Bandwidth Enhancement of Symmetrical Fourth-Teeth-Shaped Microstrip Antenna

Abstract: The microstrip antenna with a symmetrical rectangular radiator and four teeth is described. The influence of the base geometric parameters of the antenna on the bandwidth at the base frequency was studied. The following geometric parameters of the antenna are selected: the length and the width of the radiator, the depth of cuts, the thickness of the substrate, the length of the ground plane and the width of the feed line. The regression analysis was carried out and the mathematical model describing the dependence of the bandwidth on the length and the width of the radiator and the depth of the cuts was developed. The rootmean-square error and the relative absolute error of the model were calculated. The graphs of the bandwidth dependences on the geometric parameters are presented. It was established that the decrease of the bandwidth values is associated with an increase of the radiator width and the substrate thickness. It was shown that a slight influence on the bandwidth are made by the changes of the radiator length and the depths of the cuts only in the case when the radiator width is much smaller than its length. The proposed formula describing the relationship of the bandwidth with the geometric parameters of the antenna can be used to design a four-tooth antenna with wide bandwidth.