Design of cloaked Yagi-Uda antennas

Evolutionary Optimization of Yagi-Uda Antennas

Yagi-Uda antennas are known to be difficult to design and optimize due to their sensitivity at high gain, and the inclusion of numerous parasitic elements. We present a genetic algorithm-based automated antenna optimization system that uses a fixed Yagi-Uda topology and a byte-encoded antenna representation. The fitness calculation allows the implicit relationship between power gain and sidelob...

Hybrid Semiconductor Nanowire-Metallic Yagi-Uda Antennas.

We demonstrate the directional emission of individual GaAs nanowires by coupling this emission to Yagi-Uda optical antennas. In particular, we have replaced the resonant metallic feed element of the nanoantenna by an individual nanowire and measured with the microscope the photoluminescence of the hybrid structure as a function of the emission angle by imaging the back focal plane of the object...

Membrane-supported Yagi-uda Millimeter-wave Antennas

This paper presents the design, fabrication and “on wafer” characterization of membrane-supported YagiUda CPW fed antenna structures. The antennas were designed for the 60 GHz and 77 GHz frequency operating ranges. The 60 GHz antennas were fabricated on a semi-insulating GaAs membrane using GaAs micromachining. The 77 GHz antennas were manufactured on 1.4 μm thin SiO2/Si3N4 membranes obtained b...

Evolutionary Optimization of Quadrifilar Helical and Yagi-Uda Antennas

We present optimization results obtained for two type of antennas using evolutionary algorithms. A quadrifilar helical UHF antenna is currently flying aboard NASA’s Mars Odyssey spacecraft and is due to reach final Martian orbit insertion in January, 2002. Using this antenna as a benchmark, we ran experiments employing a coevolutionary genetic algorithm to evolve a quadrifilar helical design in...

Multipole methods for nanoantennas design: applications to Yagi-Uda configurations