This communication presents the design of 1 bit coding engineered reflector for wideband monostatic/bistatic radar cross section (RCS) reduction under a wide angle incidence by redirecting backscattered electromagnetic (EM) energies into and countless angles. The proposed surface can achieve an excellent RCS performance more than 10 dB over frequency range from 60 to 120 GHz angles up 75°. is a...

The U-slot micro-strip patch antennas were originally developed for bandwidth broadening applications. This study presents a transmission line feed to modify the U-slot stacked rectangular micro-strip patch antenna for Ultra-Wide Band (UWB) communications. The modified antenna has a U-cut loaded with parallel slits and corner slots and is printed on a dielectric substrate of FR4 with relative p...

In this paper, chiral E-shaped resonators are used in a waveguide. Direction of EM wave and position of resonators for effective excitation is studied and various resonances of E-shaped resonators are determined. As a consequence an analytical equivalent circuit model is proposed. Finally, an array of these resonators is used to realize a wide reject band. The resulted band stop filter performa...

Recently, high-speed multimedia communication systems have become widespread. Not only conventional narrow band speech signal (up to 3.4 kHz) but also wide band speech signal (up to 7 kHz) can be transmitted through high-speed communication lines. Generally, the quality of wide band speech signal is high and its articulation score is good for normal-hearing people, but for elderly people who ha...