1. First Report and Order, Federal Communications Commission (FCC), Feb. 14, 2002
2. Garg, R., Bhartia, P., Bahl, I., and Ittipiboon, A.: ‘Microstrip antenna design handbook’, (Artech House, Norwood, MA, USA 2001)
3. Microstrip antenna aperture-coupled to a microstripline
4. The SSFIP: a global concept for high-performance broadband planar antennas