1. Bahl, J. and P. Bhartia, Microstrip Antennas, Artech House, 1980.
2. James, J. R. and P. S. Hall, Handbook of Microstrip Antennas, Peter Peregronic Ltd., 1989.
3. Bhattaacharyya, K. and L. Shafai, "Surface wave coupling between circular patch antennas," Electronic Letters, Vol. 22, No. 22, 1986.
4. Lechtreck, L. W., "Effects of coupling accumulation in antenna arrays," IEEE Trans. Ant. Prop., Vol. AP-16, No. 1, 1968.
5. Pozar, D. M. and D. H. Schaubert, "Scan blindness in infinite phased arrays of printed dipoles," IEEE Trans. Ant. Prop., Vol. AP-32, No. 6, 1984.
6. Richards, W. F., S. E. Davidson, and S. A. Long, "Dual band reactively loaded microstrip antenna," IEEE Trans. Ant. Prop., Vol. AP-33, No. 5, 556-561, 1985.
doi:10.1109/TAP.1985.1143617
7. Davidson, S. E., S. A. Long, and W. F. Richards, "Dual band microstrip antennas with monolithic reactive loading," Elec. Letters, Vol. 21, No. 20, 936-937, 1985.
8. Mcilvenna, J. and N. Kernweis, "Modified circular microstrip antenna elements," Elec. Letters, Vol. 15, No. 7, 207-208, 1979.
9. Nakano, H. and K. Vichien, "Dual frequency square patch antenna with rectangular notch," Elec. Letters, Vol. 25, No. 16, 1067-1068, 1989.
10. Zhong, S. S. and Y. T. Lo, "Single element rectangular microstrip antenna for dual-frequency operation," Elec. Letters, Vol. 19, No. 8, 298-300, 1983.
11. Negev, M. and C. S. Samson, "Integrating multi channel and multi-frequency microstrip antenna array," Microwave and RF Engineering, 41-44, 1989.
12. Abdelaziz, A. A.A. Henderson, and J. R. James, "Dual band circularly polarized microstrip array element," Proc. JINA Conference, 321-324, 1990.
13. James, J. R. and G. Andrasic, "Super dichroic microstrip antenna arrays," Proc. IEEE, 304-312, 1988.
14. Long, S. A. and M. D. Walton, "A dual frequency stacked circular disc antenna," IEEE Trans. Ant. Prop., Vol. AP-27, No. 2, 270-273, 1979.
doi:10.1109/TAP.1979.1142078
15. Legay, H. and L. Shafai, "New stacked microstrip antenna with large bandwidth and high gain," IEE Proc. Micro. Ant. Prop., Vol. 141, No. 3, 99-204, 1994.
16. Zurcher, J. F. and F. E. Gardiol, Broad-band Patch Antennas, Artech House, 1995.
17. Long, S. A. and M. D. Walton, "Mutual coupling between stacked square microstrip antennas fed on their diagonal," IEEE Trans. Ant. Prop., Vol. 39, No. 7, 1049-1051, 1991.
doi:10.1109/8.86931