DEVELOPMENT OF DUAL-BAND CIRCULARLY POLARIZED ANTENNAS FOR GNSS REMOTE SENSING ONBOARD SMALL SATELLITES (original) (raw)
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Dual Circularly Polarized Antennas with Low Cross-Polarization for GNSS-R Applications
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TELKOMNIKA, 2022
A novel series fed dual band stacked microstrip patch antenna (SMPA) offering circular polarization (CP) over wide beam is proposed for Indian regional navigation satellite system (IRNSS). The antenna is designed to function at far apart dual frequencies 1.176 GHz (L5 band) and 2.492 GHz (S band) intended for the receiver terminals of IRNSS system. The dual band performance with large frequency ratio (about 1:2.1) has been obtained by two stacked patches with an air layer between them. The square notches at the corners along the diagonal of lower square patch, one sided corner truncation along the diagonal of upper square patch and feeding along central axis is used to obtain CP (with axial ratio < 2) at both the operating bands. The square patches are excited with novel series feed technique. The proposed novel antenna has been designed, simulated and developed to meet the stringent design requirements for IRNSS navigation system. The antenna has achieved an impedance bandwidth of 2.6% and 2.2% at L5 and S band frequency respectively. It possesses positive gain beamwidth of 120and 3 dB axial ratio beamwidth of 120◦ and 60◦ at L5 and S band frequencies respectively.
A compact circularly polarized shorted annular stacked patch antenna has been proposed for global navigation satellite system (GNSS) in this paper. The antenna has been designed to operate for the satellite navigation frequencies including GPS, GLONASS, Galileo and Compass (1100 MHz-1600 MHz). In order to obtain wideband characteristics, broadband 90 • hybrids have been used as a secondary network. The designed antenna has a 73.7% (10-dB) return loss bandwidth from 0.9 GHz to 1.95 GHz, and 60.1% 3-dB axial ratio bandwidth from 0.96 GHz to 1.8 GHz, respectively. Shorted annular stacked patch structure is incorporated into the antenna design helping to obtain stable gain bandwidth, broad beamwidth characteristics and good axial ratio at low elevation. The designed antenna occupies a compact size of 100 mm × 100 mm × 15.5 mm.
The State University of Rio Grande do Sul is one of the partners to develop a National Satellite Network Stations for remote sensor data gathering and communication in Universities and Schools. The research has focused on a Low Earth Orbit (LEO) CubeSat system, with support from the Brazilian federal government’s and Brazilian Space Research Program. Our objective is to describe the implementation of a compact, low-cost antenna solution for the National Satellite Network, operating in the 145-146 MHz band. This paper proposed a single feeding port, low profile VHF omnidirectional circularly polarized (CP) antenna. The simplicity of the design coupled with broad impedance bandwidth and axial ratio make it suitable for satellite communication terminals.
Istanbul University - Journal of Electrical and Electronics Engineering, 2017
In this paper, the design, production and results of different types of omnidirectional and circularly polarized antennas for satellite communication applications such as telemetry or telecommand, are explained. These antennas consist of identical inclined slots placed on a circular waveguide and two radially outward parallel cylindrical plates in order to provide circular polarization. The feeding of the antenna is provided by a special transition structure between rectangular waveguide to circular waveguide. The first type of antenna contains eight identical slots on the circular waveguide, which gives about 3 percent frequency (impedance) bandwidth for 10 dB return loss. This antenna provides gain variation of about 0.7 dBi and axial ratio lower than 1 dB in the azimuth plane at the center frequency. The second type, which is designed to enhance the frequency bandwidth, includes nonidentical slots on the circular waveguide where the length of four among eight slots is reduced. Th...