A satellite communications system is based on antennas in a stable orbit above the earth. Satellites serve as relay stations in the sky. The basic idea of satellite communications is that two stations on earth discuss via one or more satellites. So a little bit of satellite-related terminology: 1. Earth station is an antenna on or near the surface of the earth. 2. Uplink is a transmission from ...

The interaction of thruster plumes with satellite components is investigated with emphasis on the undesirable effects such as disturbance force/torque, thermal loading, and species deposition in the Korea MultiPurpose Satellite-II (KOMPSAT-II) base region. Actual configuration of satellite is simplified by considering four major components of hydrazine thrusters, S-band antenna, and surrounding...

The fourth generation mobile communication has used MIMO (Multiple Input Multiple Output) technology to improve system performance .MIMO can be used to get better capacity, coverage, high data rates and throughputs. Land mobile satellite (LMS) systems are an important element of the third and fourth generation of wireless systems. In satellite communication system, the use of nonlinear Travelin...

The possibility of employing the same spacecraft at several orbital locations, changing the coverage region, and compensating for varying weather conditions are the main reasons why reconfigurable antennas for contoured beam generation can provide significant advantages in satellite communications. Though extremely attractive in terms of cost and manufacturing, shaped reflectors lack so far the...

In this paper, a new compact wideband monopole antenna is presented for wireless communication applications. This antenna comprises of a new radiating patch, a new arc-shaped strip, microstrip feed line, and a notched ground plane. The proposed radiating patch is combined with a rectangular and semi-circular patch and is integrated with a partial ground plane to provide a wide impedance bandwid...

The use of Global Navigation Satellite System (GNSS) signals reflected from the Earth’s surface has progressed from its beginnings in the early 1990’s to a demonstrated practical linkage of measurements to geophysical characteristics of ocean, ice and land surfaces. A pioneering space-based experiment was carried on the UK-DMC satellite launched in September of 2003. The GPS receiver on the sat...

Helical antennas have been widely used in a various useful applications, due to their low weight and low profile conformability, easy and cheap realization. Radiation properties of this antenna are examined both theoretically and experimentally. In this paper, an attempt has been made to investigate new helical antenna structure for Applications. CST MWS Software is used for the simulation and ...

A Microstrip Patch Antenna is a type of radio antenna with a low profile, which can be mounted on a flat surface. It is a narrowband, wide-beam fed antenna fabricated by etching the antenna element pattern in metal trace bonded to an insulating dielectric substrate such as a printed circuit board with a continuous metal layer bonded to the opposite side of the substrate which forms a ground pla...