The designs of dual band microstrip patch antennas because of their multi-functionality are becoming popular. Satellite mobile and fixed communication for Space Research, Met. Satellite, Radiolocation, Meteorological aids, aeronautical Radio navigation data and analysis has got lot of attentions in the recent years. Achieving selected multiband operation requires precise bandwidth and mutually ...

For effective use of frequency band, carrier superposing (common band) technique has been introduced to satellite communication systems. Meanwhile the satellite’s Traveling Wave Tube Amplifier (TWTA) is preferred to be operated near saturation level for power efficiency. However nonlinearity characteristics of TWTA around that level become the cause of interference for carrier superposing syste...

This work presents a VSAT based approach for extending mobile communication access to rural communities in developing countries using VSAT and satellite technology. The rural areas are clustered into village community cells with each cluster being served by a non regenerative bidirectional repeater system. The telecommunication technology of choice is the GSM standard. Traffic from the rural ar...

A continuously reconfigurable metasurface reflector based on unit cell mushroom geometry that was integrated with a varactor diode is presented in this paper. The of the designed and optimized to operate X-band Ku-band, improving satellite communication’s quality service. losses mechanisms continuous control over phase reflection beam steering resolution are considered analysis results presente...

Since the designation in the 1970’s of a military satellite communications Ku-band (30-31 GHz uplink, 20.2-21.2 GHz downlink), these frequencies have held great potential to support U.S. forces and requirements. In 1995, the Ku band was chosen for the Global Broadcast Service (GBSJ which will be operational on the UFO satellites beginning in 1998. However, only a small percentage of the allocat...

this paper presents the design and simulation of a typical ka band satellite beacon receiver for propagation experimentation. using satellite beacon signal as a reference signal in satellite wave propagation study, is one of the most important methods. satellite beacons are frequently available for pointing large antennas, but such signals can be used for measuring the effect of natural phenome...

The Satellite Systems Research group (www.crc.ca/rss) of the Communications Research Centre Canada (CRC) conducts research and development on systems, concepts and technologies suitable for future generations of communication and navigation satellites. Over the past decade, R&D has been carried out in portable satellite terminals operating at Ka-Band frequencies (30/20 GHz). This paper presents...

VLA continuous monitoring of ER Vul during two 11.5 hour sessions in September 1995 in the radio continuum at 3.6 cm (X-band) showed a variation pattern similar to that observed in 1990 and 1991, but at a lower mean flux level. Simultaneous observations with the EUVE satellite in the 70 – 140 Å band did not show any significant flaring variability of the star.

Band-notch characteristic has been of great interest recently to overcome the electromagnetic interference of Ultra-wideband systems (UWB) with other existing ones. In this paper, we present a novel microstrip-fed antenna with band rejection property appropriate for UWB applications. Band-notch characteristic has been achieved by adding a rectangular resonant element to the ground section. A pr...