A modified circular patch antenna design has been proposed in this paper, the bandwidth of this antenna is optimized using the genetic algorithm (GA) based on fuzzy decision-making. This design is simulated with HP HFSS Program that based on finite element method. This method is employed for analysis at the frequency band of 1.4 GHz- 2.6 GHz. It gives good impedance bandwidth of the order o...

In this article, we present a new design of a coplanar waveguide fed (CPW-fed) ultra-wideband (UWB) antenna with dual band-notched characteristics. Two notched frequency bands are achieved by using two inverted U-shaped stepped impedance resonators. The proposed antenna can operate from 2.82 to 11 GHz (118%), defined by VSWR< 2, except two notched bands around 3.5 GHz (WiMAX) and 5.5 GHz (WLAN)...

the broadcast domination number of the cartesian product of two cycles is completely determined.

E lectrically small antennas have been an important part of communications engineering since the beginning. Whether they are small compared to the extremely long wavelengths used at the lowest radio frequencies, or intended to save space in GHz-range wireless devices, the basic principles are the same. This tutorial will review those principles, with primary attention to describing the performa...

M ULTI-user Multi-Input Multi-Output (MU-MIMO) technologies have become an important feature of the physical layer in modern wireless communication systems, such as in wireless LAN 802.11 and 4G networks including LTE-Advanced and mobile-WiMax, that need throughput in the order of hundreds of megabits per second or more. MU-MIMO has become an important research area, particularly for downlink o...

The very low frequency (VLF) propagation mapper (VPM) is a 6U CubeSat designed to measure VLF radio waves in Low-Earth Orbit. science goals of the VPM mission are signals broadcast by DSX mission, and study natural anthropogenic (from lightning transmitters) near-Earth space environment. primary payload consists an electric field dipole antenna deployed 2 meters length, magnetic search coil 50 ...

in this paper, a novel directional super wide band micro strip antenna based on a simple and new geometry has been proposed. the antenna exhibits the widest bandwidth ever reported to the authors’ knowledge from 50 ghz to 200 ghz. its radiation pattern is approximately steady in the frequency ranges of 50 ghz to 200 ghz. the antenna consists of a club-like radiating patch, a combination of thre...

For the two-user multiple-input multiple-output (MIMO) broadcast channel with delayed state information at transmitter (CSIT) and arbitrary antenna configurations, all degrees-of-freedom (DoF) regions are obtained. However, for three-user MIMO CSIT DoF region of order-2 messages is still unclear only a partial achievable order-1 obtained, where desired by two receivers one receiver, respectivel...