@article{upm12151,
          volume = {60},
          number = {5},
          author = {Andr{\'e}s Garc{\'i}a Aguilar and Jos{\'e} Manuel Incl{\'a}n Alonso and Luc{\'i}a Vigil Herrero and Jos{\'e} Manuel Fern{\'a}ndez Gonz{\'a}lez and Manuel Sierra P{\'e}rez},
           title = {Low-Profile Dual Circularly Polarized Antenna Array for Satellite Communications in the X Band},
       publisher = {IEEE},
         journal = {IEEE Transactions on Antennas And Propagation},
           pages = {2276--2284},
            year = {2011},
             url = {http://oa.upm.es/12151/},
        abstract = {A planar antenna is introduced that works as a portable system for X-band satellite communications. This antenna is low-profile and modular with dimensions of 40 {$\times$} 40 {$\times$} 2.5 {$\times$} cm. It is composed of a square array of 144 printed circuit elements that cover a wide bandwidth (14.7\%) for transmission and reception along with dual and interchangeable circular polarization. A radiation efficiency above 50\% is achieved by a low-loss stripline feeding network. This printed antenna has a 3 dB beamwidth of 5?, a maximum gain of 26 dBi and an axial ratio under 1.9 dB over the entire frequency band. The complete design of the antenna is shown, and the measurements are compared with simulations to reveal very good agreement.}
}