References

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Denidni, T.A. and T.E. Libar, 2003. Wide band four-port butler matrix for switched multibeam antenna arrays. Proceedings of the IEEE 14th International Symposium on Personal, Indoor and Mobile Radio Communication, Volume 3, September 7-10, 2003, Beijing, China, pp: 2461-2464.

El-Zooghby, A., 2005. Smart Antenna Engineering. Artech House Inc., Norwood, MA., USA., ISBN-13: 978-1580535151, Pages: 330.

Godara, L.C., 2004. Smart Antennas. CRC Press, Boca Raton, FL., USA., ISBN-13: 9780849312069, Pages: 448.

Kumar, G. and K.P. Ray, 2003. Broadband Microstrip Antennas. 1st Edn., Artech House Inc., London, ISBN: 1-58053-244-6.

Neron, J.S. and G.Y. Delisle, 2005. Microstrip EHF butler matrix design and realization. ETRI J., 27: 788-797.
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Pozar, D.M., 2005. Microwave Engineering. 3rd Edn., John Wiley and Sons, New York.

Sainati, R.A., 1996. CAD of Microstrip Antennas for Wireless Applications. Artech House Inc., Norwood, MA., USA., ISBN-13: 978-0890065624, Pages: 255.

Winters, J.H., 1998. Smart antennas for wireless systems. IEEE Personal Commun., 5: 23-27.
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Wu, L., 2007. Planar multi-beam antenna for W-LAN. Duisburg, November 2007.