Gain Characteristic Maintained, Miniaturized LPDA Antenna Using Partially Applied Folded Planar Helix Dipoles

A Miniaturized Ultra Wideband Slot Antenna with Band Notched Characteristic

A Compact planar slot antenna is proposed and developed for Ultra Wideband Applications. The antenna has compact size of 28 x 31 x 0.8 mm 3 . The antenna is fabricated with FR4 substrate and it is fed by Coplanar Wave Guide. The antenna is investigated experimentally to obtain required return loss, gain and radiation pattern characteristics. The antenna operates over a band between 3.1 GHz and ...

Microstrip Antenna Gain Enhancement using Near Zero Refractive Index Metamaterials

Some useful features of microstrip patch antennas are low profile, low weight and easy fabrication. However this type of antenna suffers from having a low gain, caused by propagation surface waves. In this paper, a new near zero refractive index metamaterial (MTM) unit cell is designed and fabricated as a superstrate over a Rectangular Microstrip Patch Antennas (RMPA). In order to obtain a maxi...

High Gain Planar Antenna Structures for Ka-band Applications

The Design and Optimization of Planar LPDAs

A significant space reduction of a Planar Log-Periodic Dipole Array (LPDA) is achieved in this work. This reduction was performed by utilizing the first order iteration meander shape dipole in the design of a planar LPDA. The minimization procedure is illustrated in this work by presenting two designs for a Euclidean LPDA with linear dipoles and a meander LPDA operating over the entire S freque...

Comparison of evolutionary algorithms for LPDA antenna optimization

A novel approach to broadband log-periodic antenna design is presented, where some of the most powerful evolutionary algorithms (EAs) are applied and compared for the optimal design of wire log-periodic dipole arrays (LPDA) using NEC (Numerical Electromagnetics Code). The target is to achieve an optimal antenna design with respect to maximum gain, gain flatness, Front to Rear ratio (F/R) and SW...