Circular Slot Printed Microstrip Notch Band UWB Antenna for Wireless Communication Applications
Mr. Jeevan Kharat, Student, Sinhgad College Of Engineering, Pune, Maharashtra, India, jeevankharat.scoe.entc@gmail.com
Mr. Adnan Pathan, Student, Sinhgad College Of Engineering, Pune, Maharashtra, India, adnanpathan.scoe.entc@gmail.com
Ms. Bharati Lad, Student, Sinhgad College Of Engineering, Pune, Maharashtra, India, bhartilad.scoe.entc@gmail.com
Prof. Ganesh.N. Gaikwad, Assistant Professor, Sinhgad College of Engineering, Pune, Maharashtra, India
gngaikwad.scoe@sinhgad.edu
Dr. Kailas K. Sawant , Assistant Professor, Defence Institute of Advanced Technology, Pune, Maharashtra, India
kailassawant2007@gmail.com
Abstract: A compact ultrawideband (UWB) microstrip antenna with integrated band-notch functionality is proposed in this work. The antenna comprises a circular radiating patch with a concentric slot to enhance impedance matching and extend operational bandwidth from 3.1–10.6 GHz, defined by 10 dB return loss. A sharp notched band in the X-band (7.3–8.1 GHz) is achieved by embedding a split ring resonator (SRR) on the radiating patch, effectively suppressing resonant surface currents and minimizing interference. Furthermore, a partial ground plane integrated with a defected ground structure (DGS) is employed to improve impedance bandwidth and return loss. The antenna is fabricated on an FR4 substrate (εr = 4.4, tanδ = 0.02) with compact dimensions of 20 × 20 mm². Simulated results confirm S11 < –10 dB across the UWB band, excluding the notched frequency, with a notch depth exceeding –5 dB. The radiation pattern remains quasi-omnidirectional with stable gain outside the notched region. The proposed antenna ensures efficient spectral utilization, reduced mutual interference, and is well-suited for UWB applications such as ground-penetrating radar (GPR), body area networks (BANs), and vehicular radar. The design methodology also offers potential for future tunable notch-band antennas using active switching elements.
Keywords: Band-notch, UWB antenna, microstrip slot antenna, split ring resonator, defected ground structure, compact design
