Abstract—This paper describes a wideband double-dipole Yagi-Uda antenna fed by a microstrip-slot coplanar stripline transition. The conventional dipole driver of a Yagi-Uda antenna is replaced by two parallel dipoles with different lengths to achieve multi-resonances, and a small, tapered ground plane is used to allow flexibility in the placement of a pair of reflectors for effective reflection...

In view of the development for TD-SCDMA communication system and combine with the miniaturization technology of smart antenna, by using balun feeding structure and consist of splitters and neural networks, this paper proposed a four units of dual polarized and a eight units of +45/-45 polarized antenna array which on the basis of printed dipole antenna. The simulation results show that the isol...

We experimentally demonstrate interferometer-type guiding structures for neutral atoms based on dipole potentials created by microfabricated optical systems. As a central element we use an array of atom waveguides being formed by focusing a red-detuned laser beam with an array of cylindrical microlenses. Combining two of these arrays, we realize X-shaped beam splitters and more complex systems ...

Microstrip patch antennas are intrinsically narrow bandwidth devices, i.e. less than 10 %. Special techniques are always applied in order to increase their bandwidths. These include complicated wideband balun impedance transformers and parasitic elements. Abdelaziz reported a 10 GHz dual-element microstrip patch antenna design which was printed on a 1.6 mm thick Duriod substrate [1]. The two el...

We investigate two-dimensional atomic arrays as a platform to modify the electromagnetic environment of individual quantum emitters. Specifically, we demonstrate that control over emission linewidths, resonant frequency shifts, and local enhancement driving fields is possible due strong dipole-dipole interactions within ordered, subwavelength atom configurations. these effects can be used drama...

The microwave power transmission is an approach for wireless power transmission. As an important component of a microwave wireless power transmission systems, microwave rectennas are widely studied. A rectenna based on a microstrip dipole antenna and a microwave rectifier with high conversion efficiency were designed at 2.45 GHz. The dipole antenna achieved a gain of 5.2 dBi, a return loss grea...

Adaptive nulling algorithms that minimize the total array output power from the array require constraints on the adaptive weights, otherwise nulls would be placed in the main beam and the desired signal rejected. The concept of cancellation patterns is reviewed and extended to partial adaptive nulling. Cancellation patterns are then extracted from adaptive nulling results with a genetic algorit...

We examined the uncertainty of two-dimensional (2D) resistivity method using conceptual cavity models. The experimental study was conducted to validate numerical model results. Spatial resolution and sensitivity perturbations were also assessed checkerboard tests. Conceptual models simulated generate synthetic data for dipole-dipole (DD), pole-dipole (PD), Wenner–Schlumberger (WS), pole-pole (P...

The mutual coupling in a phased array is a well-known phenomenon. It affects the active element pattern of the array as the phase of the individual element is altered. In an array that has many elements, the effect is identical for all the elements that are nearer to the center of the antenna, thus allowing a more predictable scan performance with respect to the phase of the elements. However, ...