Sushanta Sarkar

Use of particle swarm optimization to obtain designing parameters from data set of frequency selective surface

To get designing parameters of a frequency selective surface is very difficult and time consuming. This work suggests a method where different designing parameters with its respective resulting factors are kept in a data set from where accurate designing factors can be found for a desired frequency. Particle swarm optimization technique is suggested for proper searching. This algorithm can search efficiently and find approximate value of the desired parameters if the accurate one is not present in the data set. This paper deals with a data set. It includes different periodicities in a two dimensional array of circular patch type frequency selective surfaces and the resonating frequencies of the structures. Particle swarm optimization program efficiently searches from this data set and shows periodicity for a desired frequency.

Compact, Multi-band Microstrip Antenna with High Gain

In this paper, theoretical investigations of a printed microstrip antenna, using coaxial probe feed method is presented. The proposed antenna provides promising enhancement of gain. It also gives triple frequency bands. The high gain with triple band is obtained using E shaped patch and slitted rectangular ground plane. The simulation is carried out using a Method of Moment (MOM) based ANSOFT software. This novel designed antenna of high gain (more than 6dBi) and triple band is described in detail in this study. The proposed antenna is simple in structure compared to the regular stacked or coplanar parasitic patch antennas. It is highly suitable for wireless communications.

Design of an Aperture Type Frequency Selective Surface with Sharp Roll -off

In this paper effort has been given to design a broad band high roll off aperture type frequency selective surface. To achieve this, different structures like circular, hexagonal, square and tripole are investigated and compared. Tripole is proved to be the best element to achieve high roll off and broad band. The design is modified as double layer to make it even more selective filter. The final design is fabricated and measured to validate. Measured result follows the simulated result closely.

Investigation on Broadband Microstrip Two Element Monopole Antenna with High Gain

AbstractThe paper deals with the theoretical and experimental investigation on a simple two-element antenna exhibiting wideband operation. This antenna consists of two monopole antenna elements with modified ground plane. Generally, monopole antenna provides low gain. Here, upto 6 dBi gain has been achieved. Percentage bandwidth of the antenna is 80%. Previously, researchers have already achieved this type of percentage bandwidth but in most of the cases, gain is much lower. The novelty of this paper lies in the achievement of wide bandwidth with high gain.