Naveen Kumar Saxena

Circular array of microstrip circular patches printed on LiTiMg ferrite substrate

A four elements circular array of microstrip circular patches presented which is printed on LiTiMg ferrite substrate. Comparison of radiation patterns between Quartz substrate and polycrystalline ferrite substrate (LiTiMg ferrite) circular patch microstrip antenna (CPMAA) shows the effective use of Li ferrites in antenna applications in X-band of electromagnetic wave spectrum. In this work we also synthesized the polycrystalline LiTiMg ferrite of 2200 Gauss 4πMs and characterize their electric and magnetic properties as a substrate for CPMAA.

Linear Array of Microstrip Rectangular Patches on Magnetically Biased LiTiZn Ferrite Substrate at 10 GHz

Abstract The effect of magnetic biasing on the performance of four element linear array of microstrip rectangular antenna (RPMAA) on LiTiZn ferrite substrate at 10 GHz is discussed. In this study, we synthesized the polycrystalline LiTiZn ferrite of 2200 Gauss 4πMs and characterized its electric and magnetic properties as a substrate for RPMAA. The total field patterns for single patch and array geometry have been computed and plotted using vector wave technique and pattern multiplication approach. It is observed that the array geometry is suitable for controlling directive beam by the external magnetic field. Results show that the applied magnetic field compares and distributes the radiated power between the main lobe and side lobes.

Optimization of Cutoff Frequency Limits of Microstrip Circular Patch Antenna Printed on Ferrite Substrate by Artificial Neural Network Analysis

General artificial neural network (ANN) analysis has been applied to optimize the lower and upper frequency limits of cutoff region of switchable microstrip circular patch antenna printed on ferrite (LiTiZn) substrate in the X-band range. The ferrite substrate offered numbers of novel magnetic and electrical characteristics including switchable and polarized radiations from a microstrip antenna with DC magnetic biasing. For particular frequency limits most of the power will be converted into mechanical waves and very little radiates into air. Under such condition the antenna become switch off, in the sense of effectively absence as radiator. In this work Radial Basis Function (RBF) networks has been applied in ANN models. Synthesis has been defined as the forward side and then analysis as the reverse side of the problem. In the RBF network, the spread value has been chosen as 0.01, which gives the best accuracy. RBF has been tested with 100 samples frequencies but trained only for particular cutoff 15 samples frequencies. The obtained optimized of value lower and upper cutoff frequency (wl & wu) are very close to the values measured through the material dispersion graph which has been plotted for perpendicular applied 1500 Oe magnetic field.

GA Analysis of Switchability of Ferrite Rectangular Patch Antenna

The application of Genetic Algorithm (GA) to analyze / optimize the switching behavior of magnetically biased switchable microstrip antenna, fabricated on ferrite substrate, is reported. In this work, GA has been applied to optimize extraordinary wave propagation constant (Ke) which is mainly responsible for the switchability of antenna. The wave propagation constant becomes zero or negative under proper magnetic biasing which resist the antenna as radiator without a mechanical maneuvering. The fitness functions for the GA program have been developed using mathematical formulation based on nonreciprocal approach of ferrite substrate under external magnetic field. The computed results are in good agreement with the results obtained experimentally and trained artificial neural network analysis. In this ANN training Radial Basis Function (RBF) networks is used. All programming related to genetic algorithm and ANN analysis performed by MatLab 7.1.

Application of Genetic Algorithm for Optimization of Important Parameters of Magnetically Biased Microstrip Circular Patch Antenna

The application of Genetic Algorithm (GA) to the optimization of important parameters (Directivity, Radiated Power, Impedance etc.) of magnetically biased microstrip antenna, fabricated on ferrite substrate, is reported. The fitness functions for the GA program have been developed using cavity method for the analysis of microstrip antenna. The effect of external magnetic biasing has also been incorporated in the fitness function formulation as effective propagation constant. Using stochastic based search method of GA the common characteristics of electro-magnetic were entertained which cannot be handled by other optimization techniques. The genetic algorithm was run for 500 generations. The computed results are in good agreement with the results obtained experimentally.

Sixteen elements planar array of microstrip triangular patch antenna on LiTiMg ferrite substrate

Study of sixteen elements (4 × 4) planar array of microstrip triangular patch antennas on LiTiMg ferrite substrate is presented. Obtained results also compare with same structure of antenna array on dielectric substrate. This work is proposed for the X band (10 GHz) of electromagnetic wave spectrum. The radiation patterns for both arrays geometry are computed and plotted by pattern multiplication approach. In this work we synthesized the polycrystalline LiTiMg ferrite by the solid state reaction technique (SSRT) and characterize their electric and magnetic properties.

Study and comparison of RCS of microstrip patch antennas on LiTi-ferrite substrate

Radar cross sections (RCS) of rectangular, circular and triangular microstrip patch antennas are presented which are printed on LiTi ferrite substrate in X-band (8-12 GHz) region. In this paper, we precise the preparation of a polycrystalline LiTi ferrite of 2200 Gauss saturation magnetization. The comparison of RCS patterns among RPMA, CPMA and TPMA shows the affective study of radar cross section which differentiates the stealth capacity as well as miniaturization due to the ferrite substrate application.

Microstrip array antenna on biased ferrite substrate as signal to noise enhancer

This communication a microstrip array antenna consist of 16 rectangular patches work as a signal to noise enhancer in L-band of microwave frequency is proposed. This array geometry proposed on YIG substrate which works on the principle of inverse dynamic nonlinearity of Magnetostatic waves in ferrite substrates. The simulated radiation patterns and computed values of resonance and cutoff limit is also presented which precise the tunability or nonlinear characteristic of YIG material under external magnetic biasing. The proposed antenna structure is suitable for mobile communication system.

Effect of LiTi ferrite as a substrate for microstrip patch antenna in X band

A conventional circular patch microstrip antenna (CPMA) is proposed on LiTi ferrite substrate in X-band (8-12 GHz) region. In this paper, we precise the preparation of a polycrystalline LiTi ferrite of 2200 Gauss 4 piMs and characterize their electric and magnetic properties as a substrate for CPMA. The comparison of radiation patterns and other parameters between normal dielectric substrate (Quartz) and substituted polycrystalline ferrite substrate (LiTi ferrite) CPMA shows the effective use of Li ferrites in antenna applications.

Generation of Electroacoustic Wave and its Effects on Radiation of 2×2 Planar Array of Microstrip Antenna in Plasma Medium

In this communication, generation of electroacoustic wave and its effects on the radiation characteristics of planar array of circular patch microstrip antenna has been illustrated. The array geometry is supposed to be immersed in an isotropic warm plasma medium. The array is designed on RT duroid substrate at 9.5 GHz. The far zone EM and plasma mode field expressions have been developed using vector wave function technique, pattern multiplication approach and linearized hydrodynamic theory of plasma. The field patterns, radiation conductance and directive gain of the designed array have been estimated and plotted for free space and plasma medium. The results are quite promising and the proposed array geometry may be useful for on-board applications.