Yogeshwar Kosta

Searching Most Efficient Neural Network Architecture Using Akaike's Information Criterion (AIC)

The problem of model selection is considerably important for acquiring higher levels of generalization capability in supervised learning. Neural networks are commonly used networks in many engineering applications due to its better generalization property. An ensemble neural network algorithm is proposed based on the Akaike information criterion (AIC). Ecologists have long relied on hypothesis testing to include or exclude variables in models, although the conclusions often depend on the approach used. The advent of methods based on information theory, also known as information-theoretic approaches, has changed the way we look at model selection The Akaike information criterion (AIC) has been successfully used in model selection. It is not easy to decide the optimal size of the neural network because of its strong nonlinearity. We discuss problems with well used information and propose a model selection method.

Meandered multiband metamaterial square microstrip patch antenna design

Magnetic properties can be imparted to a naturally nonmagnetic material by metallic inclusions. A multiband meandered square microstrip patch antenna loaded with such a metamaterial is reported. Metamaterials exhibit qualitatively new electromagnetic response functions that cannot be found in nature. The inclusion of these structures allows simultaneous operation over several frequencies. The antenna was designed to function in multiple bands in the frequency range 0.6–2.2 GHz. The antenna has eight working frequency bands and its centre frequencies are 670 MHz, 1185 MHz, 1293 MHz, 1747 MHz, 1909 MHz, 1999 MHz, 2063 MHz and 2134 MHz. The metamaterial also enhances the gain of the antenna, which is applicable for several wireless applications. Design results were obtained by a high frequency structure simulator which is used for simulating microwave passive components.

Investigation on radiation improvement of corner truncated triband square microstrip patch antenna with double negative material

In this paper, we have reported a truncated square microstrip patch antenna loaded with double negative material and conventional dielectric material. Metamaterials exhibit qualitatively new electromagnetic response functions that cannot be found in the nature. The inclusion of these structures allows simultaneous operation over several frequencies. We have designed an antenna loaded with metamaterial to work in three bands in the frequency range of 0.5–2.0 GHz. The designed antenna loaded with metamaterial has three working frequency bands. We have shown a comparative analysis of this metamaterial loaded antenna with conventional antenna. The designed antenna loaded with metamaterial has several wireless applications. Design results are obtained by high frequency structure simulator, which is used for simulating microwave passive components.

Design of truncated microstrip based radiating structure loaded by split ring resonator

In this paper, for the very first time, four corners truncated triple band square patch antenna loaded with Split ring resonator (SRR) structure has been reported. Based on truncated square patch antenna, it has a double split square ring resonant structure embedded in the center of the substrate of the square patch antenna. The resonant structure has a strong electric response in a certain frequency of interest, and can be used to construct metamaterial. The antenna is designed to function in triple bands in the frequency range of 0.5-2.0 GHz. The comparison of the metamaterial design with the conventional dielectric material design is also shown in the paper. Design results are obtained by a High Frequency Structure Simulator which is used for simulating microwave passive components.

Broadband compact microstrip patch antenna design loaded by multiple split ring resonator superstrate and substrate

Abstract We present microstrip patch antenna loaded with multiple split ring resonator substrate and superstrate. We analyze how the loading of split ring resonator superstrate and substrate can improve the bandwidth compared to the simple microstrip patch antenna and microstrip patch antenna loaded with split ring resonator superstrate. Another important observation is made for multiple split ring resonator loading in superstrate and substrate of microstrip patch antenna. The design is compared for two, three, and four-ring split ring resonator loading. The designs are also compared for different gap spacing between the rings. All three designs are compared for small gap and large gap between the rings. The design results in the form of reflection coefficient and bandwidth is presented in this manuscript. The design results are also compared with previously published designs.

Complementary split ring resonator metamaterial to achieve multifrequency operation in microstrip-based radiating structure design

Following recent findings on metamaterials, a miniaturized microstrip patch antenna loaded with a complementary split ring resonator (CSRR) was investigated for multiband operation. The proposed structure has a CSRR loaded in the base of the antenna to improve its performance and to make it a metamaterial. Metamaterials exhibit qualitatively new electromagnetic response functions that cannot be found in nature. The CSRR-loaded base allows simultaneous operation over several frequencies. Here, a total of seven bands were achieved by loading the patch antenna with the CSRR. The seven bands were centered around frequencies of 4.33 GHz, 5.29 GHz, 6.256 GHz, 7.066 GHz, 7.846 GHz, 8.86 GHz, and 9.75 GHz. Design results were obtained by using a high-frequency structure simulator that is used for simulating microwave passive components.

Metamaterial superstrate-loaded meandered microstrip-based radiating structure for bandwidth enhancement

We have introduced metamaterial superstrate in microstrip-based radiating structure to increase its bandwidth. Split ring resonators are added as metamaterial metallic inclusion in superstrate of the conventional design. This changes the basic structure of the material. Material properties such as permittivity and permeability changed due to change in the structure. The change in its material properties enhances the bandwidth of the antenna. The antenna is meandered to achieve better performance at the edges which in a way improve the radiation path of the patch. Here, the proposed antenna works on three bands in the range 3–8 GHz. Maximum 60% bandwidth is enhanced in the third band. The voltage standing wave ratio and return loss (S11) of the entire three bands are shown in the paper. The antenna works on 3.51, 4.86 and 7.8 GHz. Design results are obtained by high-frequency structure simulator which is used for simulating microwave passive components.

Modified RAAT (Reduced Apriori Algorithm Using Tag) for Efficiency Improvement with EP(Emerging Patterns) and JEP(Jumping EP)

There are various algorithm for finding frequent itemsets one of them is the Association rule mining. Association rule mining uses an algorithm called apriori to find frequent itemsets. But due to some limitations viz. producing large number of candidate itemsets, which results in frequent database scanning while finding frequent itemsets. For solution of all these drawbacks, here new algorithm is introduced named, Modified RAAT (Reduced Apriori Algorithm using Tag). Modified RAAT is more efficient because it performs reduction in database scan time by using a special feature named Tag parameter, A Tag parameter includes three more parameters: minimum, maximum and total number of items in a particular transaction. One can conclude the following by Comparing this Tag value with a transaction containing particular itemset, Mismatching of the parameters requires no further usage of that transaction. By counting the change in support parameter the Modified RAAT algorithm may also find various emerging patterns like JEP (jumping emerging pattern). The pattern whose support changes abruptly from zero to nonzero is classified as JEP. This concept is designed by using border-based approach to find most expressive JEP.

Multiband metamaterial truncated square microstrip-based radiating structure design

We have reported multiband meandered truncated square microstrip patch antenna loaded with metamaterial in this paper. The patch is meandered at edges and truncated at corners. Metamaterials are composite materials that provide some unique characteristics, which are not available in nature. The inclusion of these structures allows simultaneous operation over several frequencies. The antenna is designed to function in multiple bands in the frequency range of 0.5–2.0 GHz. The antenna has five working frequency bands and its center frequencies are 660, 950, 1330, 1580, and 1750 MHz for design 1. We have obtained design 2 by changing the slit size and the design has five working frequency bands. Design results are obtained by a high frequency structure simulator which is used for simulating microwave passive components.

Square-tooth split ring resonator – a novel metamaterial for bandwidth and radiation improvement in microstrip-based radiating structure design

A square multiband truncated microstrip patch antenna was investigated using a square-tooth split ring resonator for multiband applications in both S- and C-bands. The square-tooth split ring resonator is formed from metallic inclusions in a substrate to create a metamaterial. We introduce a new square-tooth split ring resonator which increases the radiation of the antenna as well as the bandwidth. This new design creates a slow wave structure. The square-tooth addition to the split ring resonator works like a slow wave structure. The square-tooth split ring resonator design is compared with the simple split ring resonator design. The square-tooth design has four bands with center frequencies of 3.88, 4.81, 5.4, and 5.62 GHz, whereas design with the simple split ring resonator has just three bands with center frequencies of 3.88, 4.74, and 5.50 GHz. The bandwidth is increased by 20% to 30% using the square-tooth split ring resonator compared to the simple split ring resonator.