M. Challal, F. Labu, M. Dehmas and A. Azrar, “Comparative Study of Three Shapes of DGS Pattern and Design of Compact Microstrip Low-Pass and Band-Pass Filters, ” Wseas Trans. on Circuits and Systems, vol. 10, issue 12, pp. 413- 422, December 2011. Publisher: World Scientific and Engineering Academy and Society

M. Challal and A. Azrar, “A Good Conversion Loss and a Very High LO-to-RF Isolation of 24 GHz Single Balanced Mixer for RF front-end Receiver, ” Maejo International Journal of Science and Technology, vol. 5, issue 3, pp. 350- 357, October 2011. , DOI: 10.14456/mijst.2011.3 , Publisher: Maejo University.

M. Challal, A. Azrar, M. Dehmas, “Rectangular Patch Antenna Performances Improvement Employing Slotted Rectangular shaped for WLAN Applications, ” IJCSI- International Journal of Computer Science Issues, vol. 8, issue 3, pp. 254- 258 , May 2011. Publisher: IJCSI Press

A. Boutejdar, M. Challal and A. Azrar, “ A Novel Band-Stop Filter Using Octagonal- Shaped Patterned Ground Structures along with Interdigital and Compensated Capacitors,” ACES Journal- The Applied Computational Electromagnetics Society, vol. 26, no 4, pp. 312-318, April 2011. Publisher: Applied Computational Electromagnetics Society

A. Recioui, A. Azrar, H. Bentarzi, M. Dehmas and M. Challal, “Synthesis of Linear Arrays with Sidelobe Level Reduction Constraint using Genetic Algorithms, ” IJMOT - International Journal of Microwave and Optical Technology, vol. 3, no. 5, pp. 524-530, Nov. 2008. DOI: IJMOT-2014-8-625, ISSN: 1553-0396. Publisher: Electrical Engineering Department, University of Nevada