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.

Fahmi, M. M., J. A. Ruiz-Cruz, R. R. Mansour, and K. A. Zaki,  "Compact Wide-Band Ridge Waveguide Dual-Band Filters",  2010 IEEE MTT-S International Microwave Symposium Digest, pp. 888-891, May, 2010.

Zhang, Y., J. A. Ruiz-Cruz, K. A. Zaki, and A. J. Piloto,  "A Waveguide to Microstrip Inline Transition With Very Simple Modular Assembly",  IEEE Microwave and Wireless Components Letters, vol. 20, no. 9, pp. 480-482, Sept., 2010.

Fahmi, M. M., J. A. Ruiz-Cruz, K. A. Zaki, and R. R. Mansour,  "Compact Ridge Waveguide Filters using Non-resonating Nodes",  2009 IEEE MTT-S International Microwave Symposium Digest, pp. 1337-1340, June, 2009.

Fahmi, M. M., J. A. Ruiz-Cruz, R. R. Mansour, and K. A. Zaki,  "Compact Ridge Waveguide Filters With Arbitrarily Placed Transmission Zeros Using Nonresonating Nodes",  IEEE Transactions on Microwave Theory and Techniques, vol. 57, no. 12, pp. 3354-3361, Dec., 2009.

Monge, J., J. A. Ruiz-Cruz, S. Anza, C. Vicente, K. A. Zaki, J. R. Montejo-Garai, J. M. Rebollar, J. Gil, B.. Gimeno, and V. E. Boria,  "High Power analysis and design of dual-mode channel filters",  2009 IEEE MTT-S International Microwave Symposium Digest, pp. 1353-1356, June, 2009.

Zhang, Y., J. A. Ruiz-Cruz, and K. A. Zaki,  "Inline and Canonical Stripline Filters with Ridge Coupling Sections for LTCC Applications",  International Journal of RF and Microwave Computer-Aided Engineering, vol. 19, no. 3, pp. 354-363, May, 2009.

Ruiz-Cruz, J. A., C. Wang, and K. A. Zaki,  "Advances in Microwave Filter Design Techniques",  Microwave Journal, vol. 51, no. 11, pp. 26-44, November, 2008.

Ruiz-Cruz, J. A., Y. Zhang, J. R. Montejo-Garai, J. M. Rebollar, and K. A. Zaki,  "Diseño de filtros dual-mode longitudinales en guía de onda rectangular",  Proc. 2008 Simposium Nacional URSI (in Spanish), pp. 1-4, Sept., 2008.

Fahmi, M. M., J. A. Ruiz-Cruz, and K. A. Zaki,  "E and H-plane wide-band ridge waveguide couplers",  International Journal of RF and Microwave Computer-Aided Engineering, vol. 18, no. 4, pp. 348-358, July, 2008.

Ruiz-Cruz, J. A., Y. Zhang, J. R. Montejo-Garai, J. M. Rebollar, and K. A. Zaki,  "Longitudinal Dual-Mode Filters in Rectangular Waveguide",  2008 IEEE MTT-S International Microwave Symposium Digest, pp. 631-634, June, 2008.

Zhang, Y., K. A. Zaki, J. A. Ruiz-Cruz, and A. E. Atia,  "Analytical Synthesis of Generalized Multi-band Microwave Filters",  2007 IEEE MTT-S International Microwave Symposium Digest, pp. 1273-1276, June, 2007.

Ruiz-Cruz, J. A., Y. Zhang, J. M. Rebollar, K. A. Zaki, J. R. Montejo-Garai, and A. J. Piloto,  "TEM Mode-Matching Analysis of Multi-coupled Strip-line Filters",  2007 IEEE MTT-S International Microwave Symposium Digest, pp. 541-544, June, 2007.

Ruiz-Cruz, J. A., Y. Zhang, K. A. Zaki, A. J. Piloto, and J. Tallo,  "Ultra-Wideband LTCC Ridge Waveguide Filters",  IEEE Microwave and Wireless Components Letters, vol. 17, no. 2, pp. 115-117, Feb., 2007.

Ruiz-Cruz, J. A., J. R. Montejo-Garai, J. M. Rebollar, and K. A. Zaki,  "Waveguide filters with elliptical function response: Overview and results of different implementations",  International Journal of RF and Microwave Computer-Aided Engineering, vol. 17, no. 1, pp. 63-69, Jan., 2007.

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., M. A. El Sabbagh, K. A. Zaki, J. M. Rebollar, and Y. Zhang,  "Canonical ridge waveguide filters in LTCC or metallic resonators",  IEEE Transactions on Microwave Theory and Techniques, vol. 53, no. 1, pp. 174-182, Jan., 2005.

Zhang, Y., K. A. Zaki, and J. A. Ruiz-Cruz,  "Dual mode bandpass filter with asymmetric transfer function",  Proc. 2005 IEEE Antennas and Propagation Society International Symposium, vol. 2B, pp. 634-637, July, 2005.

Fahmi, M. M., J. A. Ruiz-Cruz, K. A. Zaki, and A. J. Piloto,  "LTCC wide-band canonical ridge waveguide filters",  2005 IEEE MTT-S International Microwave Symposium Digest, pp. 249-252, June, 2005.

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.

Liu, Z. M., J. A. Ruiz-Cruz, C. Wang, and K. A. Zaki,  "An extremely wideband ridge waveguide filter",  2004 IEEE MTT-S International Microwave Symposium Digest, vol. 2, pp. 615-618, June, 2004.

Ruiz-Cruz, J. A., M. A. El Sabbagh, K. A. Zaki, and J. M. Rebollar,  "Full-wave design of canonical ridge waveguide filters",  2004 IEEE MTT-S International Microwave Symposium Digest, vol. 2, pp. 603-606, June, 2004.

Ruiz-Cruz, J. A., K. A. Zaki, and J. M. Rebollar,  "Mode-matching analysis of a coaxial-to-stripline discontinuity applied to the modeling of a coaxial probe",  Proc. 2004 IEEE Antennas and Propagation Society International Symposium, vol. 2, pp. 2139-2142, June, 2004.