1. D. M. Pozar, Microwave Engineering, p. 371, Addison Wesley Publishing Company Inc., USA (1990).
2. C. Zach and H. Cory, Microw. Opt. Techn. Lett. 40, 460 (2004).
3. T. K. Wu (Edit), Frequency Selective Surface and Grid Array, p. 7, John Wiley & Sons, USA (1995).
4. C. Caloz and T. Itoh, Electromagnetic Metamaterials: Transmission Line Theory and Microwave Application, p. 1, John Wiley & Sons, USA (2006).
5. S. Kahng and D. Lim, Microwave J. 55, 86 (2012).