A Compact Dual-Band Linearly Co-Polarized Antenna Array System for In-Band Full-Duplex (IBFD) Applications

Authors

  • Amit Kumar Dept. of Electronics and Communication Engineering, Indian Institute of Technology Roorkee, Roorkee-247667, India
  • Phyo Mg Mg Department of Electronics and Communication Engineering, IIT Roorkee, Roorkee, India
  • Amit Sikder Dept. of Electronics and Communication Engineering, Indian Institute of Technology Roorkee, Roorkee-247667, India
  • Gunjan Srivastava Dept. of Electronics and Communication Engineering, Graphic Era Deemed to be University Dehradun-248002, India
  • Akhilesh Mohan Department of Electronics and Communication Engineering, IIT Roorkee, Roorkee, India

DOI:

https://doi.org/10.14429/dsj.20909

Keywords:

Co-polarized antenna array, High inter-port isolation, In-band full-duplex (IBFD), Microstrip patch antenna

Abstract

This paper presents a compact, linearly co-polarized in-band full-duplex (IBFD) antenna system for dual-band applications. The antenna system comprises two identical and closely spaced two-element arrays of quarter-wavelength shorted microstrip patch antennas (MPAs). A C-shaped slot is precisely etched near the shorted edge of each individual Microstrip Patch Antenna (MPA) to facilitate dual-band characteristics. At 2.4 GHz, the MPAs operate in the TM1/2,0 mode, with efficient radiation characteristics. At 3.5 GHz, these antennas switch to the TM1/2,2 mode, to maintain optimal performance and reliability in a second operational band. The |S11| ≤ -10 dB bandwidth for each MPA is 2.5 % at 2.4 GHz and 2 % at 3.5 GHz, with inter-port isolations exceeding 20 dB and 45 dB at 2.4 GHz and 3.5 GHz, respectively. Additionally, the antenna arrays achieve a broadside gain of 8.3 dBi at 2.4 GHz and 9.4 dBi at 3.5 GHz.

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Published

2025-05-08

How to Cite

Kumar, A., Mg Mg, P., Sikder, A., Srivastava, G., & Mohan, A. (2025). A Compact Dual-Band Linearly Co-Polarized Antenna Array System for In-Band Full-Duplex (IBFD) Applications. Defence Science Journal, 75(3), 339–344. https://doi.org/10.14429/dsj.20909

Issue

Vol. 75 No. 3 (2025): Special Issue on Microwave, Antenna and Communication MAC 2024

Section

Special Issue Papers

License

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