Fahmi, M. M., J. A. Ruiz-Cruz, R. R. Mansour, and K. A. Zaki,  "Recent Advances in Filter Topologies and Realizations for Satellite Communications",  Journal of Communications and Networks, vol. 13, no. 6, pp. 625-632, Dec, 2011.

Fahmi, M. M., J. A. Ruiz-Cruz, R. R. Mansour, and K. A. Zaki,  "Recent Results on Compact Broad-Band and Multi-Band LTCC Components for RF Front-Ends",  IET Microwaves, Antennas and Propagation, vol. 5, no. 8, pp. 870-876, June, 2011.

Zhang, Y., J. A. Ruiz-Cruz, and K. A. Zaki,  "Ridge Waveguide Coupled Stripline Resonator Filters and Multiplexers",  2006 IEEE MTT-S International Microwave Symposium Digest, pp. 681-684, June, 2006.

Zhang, Y., J. A. Ruiz-Cruz, and K. A. Zaki,  "Ridge Waveguide Divider Junctions for Wide-Band Multiplexer Applications",  2006 IEEE MTT-S International Microwave Symposium Digest, pp. 1225-1228, June, 2006.

Ruiz-Cruz, J. A., Y. Zhang, M. M. Fahmi, and K. A. Zaki,  "Ridge Waveguide Elliptic Filters in Narrow-Wall Canonical Configuration",  Proc. 36th European Microwave Conference, pp. 1080-1082, Sept., 2006.

Ruiz-Cruz, J. A., K. A. Zaki, J. R. Montejo-Garai, and J. M. Rebollar,  "Rectangular waveguide elliptic filters with capacitive and inductive irises and integrated coaxial excitation",  2005 IEEE MTT-S International Microwave Symposium Digest, pp. 269-272, June, 2005.

Ruiz-Cruz, J. A., Y. Zhang, K. A. Zaki, A. J. Piloto, and J. M. Rebollar,  "Ridge waveguide branch-line directional couplers for wideband applications and LTCC technology",  2005 IEEE MTT-S International Microwave Symposium Digest, pp. 1219-1222, June, 2005.