K. L. Virga and Y. Rahmat-Samii, "Low-profile Enhanced-bandwidth PIFA Antennas for Wireless Communications Packaging," IEEE Transactions on Microwave Theory and Techniques, vol. 45, no. 10, 316 Jordanian Journal of Computers and Information Technology (JJCIT), Vol. 08, No. 04, December 2022. pp. 1879-1888, Oct. 1997, doi: 10.1109/22.641786.
 J.-Y. Sze and K.-L. Wong, "Slotted Rectangular Microstrip Antenna for Bandwidth Enhancement," IEEE Transactions on Antennas and Propagation, vol. 48, no. 8, pp. 1149-1152, Aug. 2000.
 K. K. So and K. W. Leung, "Bandwidth Enhancement and Frequency Tuning of the Dielectric Resonator Antenna Using a Parasitic Slot in the Ground Plane," IEEE Transactions on Antennas and Propagation, vol. 53, no. 12, pp. 4169-4172, Dec. 2005.
 S. T. Fan, Y. Z. Yin, B. Lee, W. Hu and X. Yang, "Bandwidth Enhancement of a Printed Slot Antenna with a Pair of Parasitic Patches," IEEE Antennas and Wireless Propagation Letters, vol. 11, pp. 1230- 1233, DOI: 10.1109/LAWP.2012.2224311, 2012.
 A. D. Tadesse, O. P. Acharya and S. Sahu, "Application of Metamaterials for Performance Enhancement of Planar Antennas: A Review," International Journal of RF and Microwave Computer‐aided Engineering, vol. 30, no. 5, p. e22154, 2020.
 M. F. Abedin and M. Ali, "Modifying the Ground Plane and Its Effect on Planar Inverted-F Antennas (PIFAs) for Mobile Phone Handsets," IEEE Antennas and Wireless Propagation Letters, vol.2, no. 1, pp. 226-229, 2003.
 R. Hossa, A. Byndas and M. E. Bialkowski, "Improvement of Compact Terminal Antenna Performance by Incorporating Open-end Slots in Ground Plane," IEEE Microwave and Wireless Components Letters, vol.14, no. 6, pp. 283-285, 2004.
 C. Picher, J. Anguera, A. Cabedo et al., "Multiband Handset Antenna Using Slots on the Ground Plane: Considerations to Facilitate the Integration of the Feeding Transmission Line," Progress in Electromagnetics Research C, vol. 7, pp. 95-109, DOI: 10.2528/PIERC09030605, 2009.
 L.-J. Xu, Y.-X. Guo and W. Wu, "Dual-band Implantable Antenna with Open-end Slots on Ground Plane," IEEE Antennas and Wireless Propagation Letters, vol. 11, pp. 1564-1567, 2012.
 H. F. Abutarboush, W. Li and A. Shamim, "Flexible-screen Printed Antenna with Enhanced Bandwidth by Employing Defected Ground Structure," IEEE Antennas and Wireless Propagation Letters, vol. 19, no. 10, pp. 1803-1807, Oct. 2020.
 L. Ji, P. Qin and Y. J. Guo, "Wideband Fabry-Perot Cavity Antenna with a Shaped Ground Plane," IEEE Access, vol. 6, pp. 2291-2297, DOI: 10.1109/ACCESS.2017.2782749, 2018.
 S. Das, P. Chowdhury, A. Biswas, P. P. Sarkar and S. K. Chowdhury, "Analysis of a Miniaturized Multiresonant Wideband Slotted Microstrip Antenna with Modified Ground Plane," IEEE Antennas and Wireless Propagation Letters, vol. 14, pp. 60-63, DOI: 10.1109/LAWP.2014.2354474, 2015.
 S. Ibnyaich, S. Chabaa, L. Wakrim et al., "A Pentagonal Shaped Microstrip Planar Antenna with Defected Ground Structure for Ultrawideband Applications," Wireless Personal Communications, vol. 124, no. 1, pp. 499-515, 2022.
 H.-Y. Li, C.-C. Lin, T.-K. Lin and C.-Y. Huang, "Low-profile Folded-coupling Planar Inverted-F Antenna for 2.4/5GHz WLAN Communications," International Journal of Antennas and Propagation, vol. 2014, Article ID 182927, 2014.
 I .J. G. Zuazola and J. C. Batchelor, "Compact Multiband PIFA Type Antenna," Electronics Letters, vol. 45, no. 15, pp. 768–769, 2009.
 F. Wang, Z. Du, Q. Wang et al., "Enhanced-bandwidth PIFA with T-shaped Ground Plane," Electronics Letters, vol. 40, no. 23, pp. 1504–1505, 2004.
 A. Kunwar, A. K. Gautam and K. Rambabu, "Design of a Compact U-shaped Slot Triple Band Antenna for WLAN/WiMAX Applications," AEU-International Journal of Electronics and Communications, vol. 71, p. 82-88, DOI: 10.1016/j.aeue.2016.10.013, 2017.
 R. Azim, M. T. Islam, N. Misran et al., "Planar UWB Antenna with Multi‐slotted Ground Plane," Microwave and Optical Technology Letters, vol. 53, no. 5, pp. 966-968, 2011.
 X. Zhang and A. Zhao, "Enhanced-bandwidth PIFA Antenna with a Slot on the Ground Plane," PIERS Proceedings, pp.1268–1272, Beijing, China, 2009.
 S. Jeon, H. Choi, H. Kim et al., "Hybrid Planar Inverted-F Antenna with a T-shaped Slot on the Ground Plane," ETRI J, vol. 31, no. 5, pp. 616–618, 2009.
 G. Singh and J. Kaur, "Design of a Compact Superstrate-loaded Slotted Implantable Antenna for ISM Band Applications," Sādhanā, vol. 46, no. 3, pp. 1-10, 2021.
 L. Wakrim, S. Ibnyaich and M. M. Hassani, "Optimization by Genetic Algorithm of PIFA Antenna Parameters for Wi-Fi Application," Proc. of the IEEE International Conference on Multimedia Computing and Systems (ICMCS), DOI: 10.1109/ICMCS.2014.6911223, Marrakesh, April 2014.
 J. W. Jayasingh, J. Anguera and D. N. Uduwawala, "A Simple Design of Multi-band Microstrip Patch Antennas Robust to Fabrication Tolerances for GSM, UMTS, LTE and BLUETOOTH Applications by Using Genetic Algorithm Optimization," Progress in Electromagnetics Research M, vol. 27, pp. 255-269, DOI: 10.2528/PIERM12102705, 2012.
 S. A. Salama and A. Z. Abdalla, "Study of Smart Antenna Characteristics Using Genetic Algorithms (GA) Applications," Proc. of the 21st IEEE Telecommunications Forum Telfor (TELFOR), DOI: 10.1109/TELFOR.2013.6716223, Belgrade, Serbia, 2014.
 L. Wakrim, S. Ibnyaich and M. M. Hassani, "The Study of the Ground Plane Effect on a Multiband PIFA Antenna by Using Genetic Algorithm and Particle Swarm Optimization," Journal of Microwaves, Optoelectronics and Electromagnetic Applications, vol. 15, no. 4, pp. 293-308, 2016.
 A. Cabedo, J. Anguera, C. Picher et al., "Multiband Handset Antenna Combining a PIFA, Slots and Ground Plane Modes," IEEE Trans. on Antennas and Propagation, vol. 57, no. 9, pp. 2526-2533, 2009.
 G. Viswanadh Raviteja and V. Rajya Lakshmi, "Gain and Bandwidth Investigations of a Novel PIFA Antenna Employing Partial Ground at 2.3 GHz for WiMax/WiFi/WLAN Applications," Microwave and Optical Technology Letters, vol. 61, no. 7, pp. 1841-1844, 2019.
 C. H. See, H. I. Hraga, R. A. Abd-Alhameed, N. J. McEwan, J. M. Noras and P. S. Excell, "A Low-profile Ultra-wideband Modified Planar Inverted-F Antenna," IEEE Transactions on Antennas and Propagation, vol. 61, no. 1, pp. 100-108, DOI: 10.1109/TAP.2012.2216494, 2013.
 N. Kumar and G. Saini, "A Novel Low profile Planar Inverted-F Antenna (PIFA) for Mobile Handsets," International Journal of Scientific and Research Publications, vol. 3, no. 3, pp. 1-4, 2013.
 W. A. Awan, A. Zaidi, M. Hussain et al., "The Design of a Wideband Antenna with Notching Characteristics for Small devices Using a Genetic Algorithm," Mathematics, vol. 9, no. 17, p. 2113, 2021.