A cost effective implementation of a 'Smart Antenna' is limited due to the number and high cost of RF array elements, RF distribution as well as phasing elements. Shaped Dielectric Lenses perform the task of collimation, to obtain multiple beams in a fixed set of directions. Lenses are inherently broadband, lower in cost, easy to fabricate, have lower dimensional tolerances, and act a...

Phased array antennas are expected to be effective for use in advanced wireless communications for mobile radio communication, wireless LAN, and satellite communication [1]. Recently, the application of photonics technology to microwave array antennas has been studied [2-5]. An optically controlled phased array antenna is very well-suited for fiber-optic microwave or millimeter-wave links. Opti...

In this paper, a dual-polarized antenna based on substrate-integrated waveguide (SIW) horn and Vivaldi is proposed. The horizontal polarization (HP) achieved by using the H-plane SIW antenna, while vertical (VP) realized typical etched surface of antenna. front aperture, dielectric lens designed to optimize impedance matching enhance directivity. Different feeding structures two polarizations a...

in view of the rapid expansion of contact lens amongst the users, new dimensions have been added to the domain of ophthalmology: giant papillay conjunctivitis, a disease caused by different kinds of contact lens, appears weeks or months after they are used, although some patients are struck years later. the predominant symptoms are increased awareness of lenses, ocular itching, blurred vision a...

ACTERIA infected with any two independently arising r (plaque type) B mutants of the bacterial virus T2H have been found, as a rule, to yield wild-type and double-mutant individuals among the viral progeny ( HERSHEY and ROTMAN 1948). This result has been interpreted in terms of recombination among nonallelic genetic-factors, and it is permissible to speak of the test in which bacteria are infec...

This paper investigates whether risks associated with time-varying arrival of jumps and their effect on the dynamics of higher moments of returns are priced in the conditional mean of daily market excess returns. We find that jumps and jump dynamics are significantly related to the market equity premium. The results from our time-series approach reinforce the importance of the skewness premium ...