• Concentric annular-ring microstrip antenna with circular polarization 

      Ramirez, M.; Parrón, Josep; González Arbesú, José María; Gemio, J. (2011)
      Article
      Accés restringit per política de l'editorial
      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 ...