Design and Experimental Validation of a Frequency-Reconfigurable Microstrip Antenna using PIN Diodes for Multiband RF Communication and Wireless Applications
Keywords:
5G Systems, Adaptive Antenna Systems, DC Biasing Network, FR-4 Substrate, Frequency-Reconfigurable Antenna, Gain, IoT, Microstrip Patch Antenna, Multiband Operation, PIN Diode, Radiation Pattern, RF MEMS, Slot-Loaded Antenna, VSWR, Wireless CommunicationAbstract
This study presents the design, fabrication, and experimental validation of a compact frequency-reconfigurable microstrip patch antenna for multiband RF communication systems. The antenna is implemented on an FR-4 substrate and employs multiple PIN diodes integrated within strategically designed slots on the radiating patch to achieve dynamic reconfiguration. By controlling the ON/OFF states of the diodes through an external DC biasing network, the effective surface current distribution is modified, enabling multiple resonant frequency states without altering the antenna geometry. A practical biasing network incorporating RF choke inductors and DC blocking capacitors is used to ensure proper isolation between RF and control signals, minimizing interference and maintaining stable operation. Experimental measurements using a vector network analyzer (VNA) confirm reconfigurable operation across multiple frequency bands with S11 values below −10 dB at the resonant frequencies. The antenna also demonstrates stable radiation characteristics and a gain ranging from 2.5 dBi to 5.8 dBi across different states. The proposed design offers a compact, low-cost, and efficient solution suitable for modern wireless communication systems, including WLAN, LTE, IoT, and sub-6 GHz 5G applications, where multiband capability and frequency agility are essential.
References
G. Singh, B. K. Kanaujia, V. K. Pandey, D. Gangwar, and S. Kumar, “Pattern and frequency reconfigurable antenna with diode loaded ELC resonator,” International Journal of Microwave and Wireless Technologies, vol. 12, no. 2, pp. 163–175, Jul. 2019.
A. A. Palsokar and S. L. Lahudkar, “Frequency and pattern reconfigurable rectangular patch antenna using single PIN diode,” AEU International Journal of Electronics and Communications, vol. 125, p. 153370, Oct. 2020.
S. M. Shah, M. F. M. Daud, Z. Z. Abidin, F. C. Seman, S. A. Hamzah, N. Katiran and F. Zubir, “Frequency reconfiguration mechanism of a PIN diode on a reconfigurable antenna for LTE and WLAN applications,” International Journal of Electrical and Computer Engineering (IJECE), vol. 8, no. 3, pp. 1893–1902, 2018.
N. Ojaroudi Parchin, H. Jahanbakhsh Basherlou, Y. I. A. Al-Yasir, A. M. Abdulkhaleq, and R. A. Abd-Alhameed, “Reconfigurable antennas: Switching techniques—A survey,” Electronics, vol. 9, no. 2, p. 336, Feb. 2020.
A. Iqbal, A. Smida, N. Khaddaj Mallat, R. Ghayoula, I. Elfergani, J. Rodriguez and S. Kim, “Frequency and pattern reconfigurable antenna for emerging wireless communication systems,” Electronics, vol. 8, no. 4, Art. 407, 2019.
D. H. Lee, J. Han, D.J. Park and S. Pyo, “2-Bit reconfigurable microstrip antenna with independently controlled hybrid slots for polarization and frequency switching,” Scientific Reports, vol. 15, Art. 43648, 2025.
Preeti Rani, M. K. Gaur, P. Tiwari, M. Kaushik, A. Shastri and V. Gahlaut, “Design and implementation of a compact ultra-wideband reconfigurable antenna using RF MEMS switch technology,” Discover Electronics, vol. 2, Art. 32, 2025.
J. Kumar, B. Basu, and F. A. Talukdar, “Modeling of a PIN diode RF switch for reconfigurable antenna application,” Scientia Iranica, vol. 26, no. 3, pp. 1714–1723, Jan. 2018.
Haris Dilder, “Design and experimental analysis of a multiband frequency reconfigurable antenna for 5G and sub-6 GHz wireless communication,” Micromachines (Basel), vol. 12, no. 1, p. 32, Dec. 2020.
S. P. Pawar, “Analysis and design of frequency reconfigurable microstrip patch antenna using PIN diode,” Journal of Mechatronics and Automation, vol. 5, no. 1, pp. 50–58, 2018.
D. Nguyen Viet, M. Di Renzo, V. Basavarajappa, B. B. Exposito, J. Basterrechea and D.-T. Phan-Huy, “Spatial modulation based on reconfigurable antennas: performance evaluation using a prototype,” arXiv preprint, 2019.
P. N. Suman and G. K. Mishra, “Frequency and pattern reconfigurable arrow shape patch antenna with a PIN diode,” Frequenz, vol. 79, no. 5 6, pp. 287–292, 2025.
Maganti Apparao and G. Karunakar, “Design and analysis of frequency reconfigurable antenna in S-band using PIN diodes,” Bulletin of Electrical Engineering and Informatics, vol. 12, no. 5, pp. 2301–2310, 2023.
S. Mansuri and S. Modasiya, “Reliable single diode patch antenna with frequency and pattern reconfigurability,” RT&A, vol. 20, no. 4, pp. 1007–1015, 2025.
J. T. Bernhard, “Reconfigurable antennas,” in Encyclopedia of RF and Microwave Engineering, K. Chang, Ed. Hoboken, NJ, USA: Wiley, 2005.
