Genetic algorithm optimization has been used in the past for size reduction of microstrip antennas by removing pixels from the entire metal area of the patch. This results in an unwieldy antenna that is not very practical. In the present work, a new methodology is developed for reducing the size of microstrip patch antennas by removing predefined slot shapes from the metal. A genetic algorithm ...

A novel compact ultra wideband (UWB) bandpass filter (BPF) based on composite right/left handed transmission line (CRLH TL) is reported in this paper. The proposed UWB BPF is designed and developed by coupling of two unit-cells of via-less CRLH TL, excited by asymmetrical coplanar waveguide (CPW) feed-line. The unit cell of CRLH TL is designed using series interdigital capacitor (IDC) in shunt ...

A wideband published slot antenna appropriate for wireless code division multiple access (WCDMA) and sustaining the international interoperability for microwave access (WiMAX) applications is planned here. The antenna is fractal line fed and its construction is based on fractal geometry where the resonance frequency of antenna is dropped by applying iteration methods. Fractal antennas are the m...

Negli ultimi decenni si è osservato un notevole incremento della spermentazione biologica in ambito bioelettromagnetico, al fine di valutare eventuali effetti indotti dall’esposizione a campi elettromagnetici (EM), quali quelli generati dagli apparati di telefonia mobile, su specifici campioni biologici. Tali studi, tuttavia, hanno dato luogo a risultati spesso contrastanti, e pertanto di diffi...

All vehicles use suspension system. The suspension system mainly consists of a mechanical spring and a damper. The damper dissipates the mechanical energy into heat and thus damps down the vehicle oscillations. In a bid to reduce the vehicle emissions, many technologies are being thought to reduce energy losses and also recover energy from the energy losses if any. One such technology is regene...

A simple Dielectric Resonator Antenna (DRA) for X band frequency operation is proposed in this paper. X band is a microwave band lies between frequency range 8 to 12 GHz. In proposed DRA reflector plane is used beneath the microstrip feed line with a small air gap, introduced between feed substrate and reflector plane to reduce the back lobe. Slot coupling is used to excite this DRA. Proposed D...

Currently available traditional electromagnetic voltage sensors fail to meet the measurement requirements of the smart grid, because of low accuracy in the static and dynamic ranges and the occurrence of ferromagnetic resonance attributed to overvoltage and output short circuit. This work develops a new non-contact high-bandwidth voltage measurement system for power equipment. This system aims ...

The preliminary design concept, for a low-loss, highbandwidth electromagnetically coupled vertical transition for use as a via between adjacent levels of a 3D-MCM based on membranesupported striplines with micro-machined shielding, is presented. The design methodology, modeling using Ansoft HFSS and simulated results are presented and together represent a complete electrical characterization of...

Attaining a controlled output strain and utilizing a full potential of active material are the significant factors to design Terfenol-D actuator devises such as active damping devices, high speed hydraulic valve actuators, large-force linear motors and large torque rotating motors. To achieve this, a high magnetic biasing field is required in an actuator. The present work attempts to propose a ...

Three types of printed radio-frequency-identification (RFID) antennas with the characteristics of high gain, wide beam wave, and omnidirectional beam wave are constructed and evaluated in this study. The objective is to find out their best reading rates for providing effective wireless communications among RFID antenna readers during the library book inventory process. Three kinds of antenna re...