Tunable Inverted U-shaped Dual Band Notch Monopole Antenna for Ultrawideband Applications

Abstract

This work presents a planar ultra-wideband (UWB) monopole antenna with controllable dual-band notches. In the proposed design, the lower and upper notch characteristics are realized by placing an inverted U-shaped slot on the radiating surface and another inverted U-shaped strip near to microstrip feed line, respectively. The controllable dual-notch frequencies are attained by placing varactor diodes at an appropriate position on the inverted U-shaped slot and inverted U-shaped strip, respectively. Simulation results show that the proposed antenna design has tunable band-notch characteristics from 5.58 GHz to 5.91 GHz and 7.02 GHz to 7.45 GHz, by decreasing the capacitance value from 2.67 pF to 0.63 pF. The fabricated prototype of the optimized design is characterized in three cases. A fairly good agreement is observed between the simulated and experimental results in all three cases. To the best of the authors’ knowledge, the dual tunable band rejects UWB is proposed for the first time in this paper.

KEYWORDS:

• Dual band
• Monopole antenna
• Tunable
• Ultrawideband

Additional information

Notes on contributors

Vikas Kumar Rai

Vikas Kumar Rai received the BE degree in electronics & communication engineering from MJP Rohilkhand University, Bareilly (2001), ME degree in microwave communication & radar engineering, (2002–2004) and is pursuing PhD degree in RF communication engineering from the Rajasthan Technical University, Kota (Rajasthan). His current research interests include RF communication, UWB active antenna, microstrip antenna, microwave device designing technology and MOS technology. Vikas Kumar Rai served as a lecturer (2004–2008), assistant professor (2008–2014) & associate professor (2014–2020) at Sachdeva Institute of Technology, Mathura in Electronics Engineering Department. He is the author/co-author of many research papers in refereed journals, international and national conferences.

Mithilesh Kumar

Mithilesh Kumar received the BE degree in electronics & communication engineering from the Govt Engineering College, Kota, University of Rajasthan, (1992) MTech degree in communication & radar engineering, (1998–1999) and PhD (2011) degree in RF communication engineering from the Indian Institute of Technology, Delhi, India. His current research interests include RF communication, UWB active antenna, microstrip antenna and microwave device designing Technology. Mithilesh Kumar served as a lecturer (1993–2000) Sr. assistant professor (2000–2008), associate professor (2008–2013), and professor (2013-till date) in Electronics Engineering Department at Rajasthan Technical University Kota, Rajasthan. He is the author/co-author of 160 research papers in refereed journals, international and national conferences. He received “First prize best student paper platinum award” in 2009 at the IEEE International conference on Antennas, Propagation and Systems held at Johor Bahru, Malaysia from December 3 to 5, 2009. He visited Malaysia, Japan and Germany. He is a Member of the IEEE-Microwave Theory and Techniques Society. Email: [email protected]