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.

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., 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.

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.

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.

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.