Concentric Annular-Ring Microstrip Antenna With Circular Polarization
ABSTRACT In this letter, we present a concentric annular-ring microstrip antenna that covers the bands of Galileo (E5a, E5b, E1, E2, L1), GPS (L1, L2, L5), and GLONASS (L1, L3). This microstrip antenna is fed by four apertures that improve the coupling. Broad band phase shifters and Wilkinson power combiners are used to generate the required circular polarization.
Conference Paper: Research activities of Spanish antenna groups[Show abstract] [Hide abstract]
ABSTRACT: When we look at the history of electricity and electromagnetism in Spain we discover that the most important Spanish researchers are generally out of the official institutions or stable research groups until the 20th century  . In the 20th century most of the scientific research is done in stable research institutions and universities and the most important electromagnetism research centres in Spain are located in the Faculty of Physics of the most important universities, the National Scientific Research Council (CSIC) and the School for Telecommunication Engineering created in 1923. But the greatest impulse of research in the antenna and radiowave propagation field is done after 1960 reaching the first national URSI conference in 1980. After that year, the relation between groups and the number of research groups is continuously growing and the relation to industry is also increasing. When Spain joins the European research organizations (COST, ERC...) and the European Union in 1985 the research support experience a fast growing and the participation in the European research structures.Antennas and Propagation (ISAP), 2012 International Symposium on; 01/2012
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ABSTRACT: A dual-band circularly polarized antenna fed by four apertures that covers the bands of GPS (L1, L2, L5), Galileo (E5a, E5b, E1, E2, L1), and GLONASS (L1, L3) is introduced. A lotus-shaped aperture is added to optimize the coupling between the microstrip lines and the rings. Three wideband planar baluns are used to achieve good axial ratio (lower than 2.1 dB in both bands) and VSWR (41.2%). The measured results of the annular-ring microstrip antenna show good performance of a dual-band operation, and they confirm the validity of this design, which meets the requirement of Global Navigation Satellite System (GNSS) applications.IEEE Antennas and Wireless Propagation Letters 12/2013; 12:615-618. DOI:10.1109/LAWP.2013.2260521 · 1.95 Impact Factor
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ABSTRACT: A dual-band circularly polarized (CP) antenna with a broadband feeding network that covers the bands of GPS (L1, L2, and L5), Galileo (E5a, E5b, E1, E2, and L1), and GLONASS (L1 and L3) is introduced. This antenna uses the miniaturized feeding network to reduce its size, which is only about 0.26λ × 0.26λ × 0.08λ. It also has another advantage of good axial ratio (AR) and gain performance in the low observation angles. The strip line with three wideband baluns is adopted in the feeding network to achieve good AR bandwidth (more than 50%) and VSWR bandwidth (about 51%). The measured gain is higher than 1 and 3 dBi in the lower and higher bands, respectively. The measured results verify the dual-band CP operation and confirm the validity of this design which meets the requirements of global navigation satellite system applications.Journal of Electromagnetic Waves and Applications 04/2014; 28(9). DOI:10.1080/09205071.2014.908151 · 1.40 Impact Factor