Folded monopole antennas have been used for many years in medium frequency amplitude modulation broadcast applications. These antennas offer a grounded radiating structure with a height approximating a quarter wavelength. Folded monopoles have been studied exhaustively during a recent effort in an attempt to characterize the input impedance and directivity characteristics as a function of monop...

The correct level alignment of multichannel reproduction systems is critical to the quality of the reproduction. This, the third paper discusses the results of three experiments employing the nine test signals discussed in paper I. Experiments employing six subjects using the method of adjustment have been conducted in a standard listening rooms using a symmetrical loudspeaker set-up. The influ...

In the present paper, directivity patterns of laser-generated sound in solids are investigated theoretically. Two main approaches to the calculation of directivity patterns of laser-generated sound are discussed for the most important case of thermo-optical regime of generation. The first approach, which is widely used in practice, is based on the simple modelling of the equivalent thermo-optic...

Computation power to simulate sound fields from the three-dimensional numerical models has progressed fast; for example, using GPU cluster systems. We can render directivity, position , distance, and reverberation of sound sources in a practical time. Furthermore, a multi-channel sound field system can be realized with low-cost digital-to-analog converter modules. Moreover, some researchers are...

An optical leaky wave antenna (OLWA) is a device that radiates a light wave into the surrounding space from a leaky wave (LW) guided mode or receives optical power from the surrounding space into a guided optical mode. In this work, we propose and provide a 3D analysis of a novel CMOS compatible OLWA made of a silicon nitride (Si3N4) waveguide comprising periodic silicon perturbations which all...

For most of the weather antenna application, the antenna must be covered with radome to enhance operational efficiency in all weather circumstances. This radome provides environmental protection and along with that it enhances antenna performance. The antenna manufacturer must evaluate radome scattering level so that they can estimate the parameter of cost effective antenna and can provide maxi...

Double-talk recognition under a distant microphone condition, a serious problem in speech applications in a real environment, is realized through use of modified SAFIA and acoustic model adaptation or training. The original SAFIA is a high-performance audio segregation method based on band selection using two directivity microphones. We have modified SAFIA by adopting array signal processing an...

A short bipolar pressure pulse with "pancake" directivity is produced and propagated when an Ultra-High Energy (UHE) neutrino interacts with a nucleus in water. Nowadays, acoustic sensor networks are being deployed in deep seas to detect this phenomenon as a first step toward building a neutrino telescope. In order to study the feasibility of the method, it is critical to have a calibrator that...

Coupling of a far-field optical mode to electronic states of a quantum absorber or emitter is a crucial process in many applications, including infrared sensors, single molecule spectroscopy, and quantum metrology. In particular, achieving high quantum efficiency for a system with a deep subwavelength quantum absorber/emitter has remained desirable. In this Letter, a hybrid optical antenna base...

There has been a lot of study published in literature on the improvement of the performances of microstrip patch antennas. Most of the solutions proposed in the past were to use an array of several antennas. The particular disadvantage of this method comes from the feeding of each antenna and also from the coupling between each element. Other interesting solutions have then been suggested: the ...