The R&D in satellite communications in Korea has been driven mainly by KCC (Korea Communications Commission) but in a small scale compared to Korea space development program organized by MEST (Ministry of Education, Science and Technology). Public and civilian satcom sector R&D has been led mainly by ETRI with small/medium companies contrary to rare investment in private sector while military s...

In this paper, a novel design of a compact planar ultra wide band (UWB) monopole antenna with triple band notched characteristics has been presented. The antenna has a unique shape and has been fed through a 50 Ω microstrip feedline. The strength of the antenna lies in three band notched properties for WiMax system at 3.3 3.7 GHz, WLAN IEEE 802.11a at 5.15 5.85 GHz and X band satellite communic...

A printed quadruple band-notched ultra-wideband (UWB) antenna characteristic is presented. The designed UWB has a size of 32 mm × 30 1.6 and covers an impedance bandwidth off 2.9–14.5 GHz for the entire frequency band. band maintains voltage standing wave ratio (VSWR) <2, except at WiMAX (3.1–3.6 GHz), WLAN (4.92–6.12 downlink X-band satellite communication systems (7.5–8.4 (10.2–11 GHz). By...

A number of satellite communication systems have been proposed using geosynchronous (GEO) satellites, as well as low earth orbit (LEO) constellations operating in the Ka-band and above. At these frequencies satellite networks are able to provide broadband services requiring wider bandwidth than the current services at C or Ku-band. As a consequence, some of the new services gaining momentum inc...

Low Earth Orbits (LEO) satellites are used for public communication and for scientific purposes. These satellites provide opportunities for investigations for which alternative techniques are either difficult or impossible to apply. Ground stations have to be established in order to communicate with such satellites. Usually these satellites communicate with ground stations at S-band. The commun...

The high energy experiment PDS is one of the Narrow Field Instruments aboard the X–ray astronomy satellite BeppoSAX . It covers the energy band from 15 to 300 keV. Here we report results on its in-flight performance and observations of galactic and extragalactic X–ray sources obtained during the Science Verification Phase of the satellite: in particular Crab, Cen X–3, 4U1626–67 and PKS2155–305.

This paper proposes a simple and small-dimensioned antenna that can provide X band Ku for the low-earth-orbiting (LEO) satellite system in an Internet of vehicles system. The is designed on substrate Arlon DiClad 880. structure consists inverted triangle geometry U-shaped slot. dimensions are 12.5 × 5 mm2, area 30 13 0.254 mm3. easy to make, manufacturing cost low. measurement results reflectio...

A dual-functionality printed dipole array antenna is proposed in this study with a fan-beam property. An integrated balun structure cooperation the arms creates resonance X-band for antenna. Adding Single-Ring Split-Ring Resonator (SR-SRR) next to feed line allows another C-band. This way, dual-band identical radiation properties accomplished. Considering distance between two resonances of ante...

The paper deals with computation of overall interference in Global Navigation Satellite Systems (GNSS) receivers and the comparison of overall degradation for every latitude and longitude with respect to time. GNSS community is quickly growing with the addition of more signals at higher power levels in the same frequency bands. Determining the effects of interference from signals transmitted by...

The NBS Boulder Laboratory has recently completed installation of a 6.1 meter Ku-band (14/12 GHz) satellite earth station and has acquired two 1.8 meter portable earth terminals and commercial spreadspectrum modems. This equipment was procured for the purpose of doing two-way time transfer experiments in collaboration with other timekeeping laboratories. Each portable earth terminal, often call...