A Compact Broadside Coupled Notched Band UWB Filter with Wide Upper Stopband

ABSTRACT

A broadside coupled ultra-wideband (UWB) bandpass filter (BPF) with notched band and wide upper stopband is proposed and implemented. Initially, a broadside coupled UWB filter structure with good passband characteristics is developed. To this, split ring resonator (SRR) metal lines of half guided waveguide length are coupled to generate passband notch. Later, stub lines are embedded in the input and output (I/O) feeding lines whose attenuation poles suppress the spurious harmonics and widen the stopband. Finally, the proposed structure is fabricated and measured which establishes the authenticity of the full-wave electromagnetic response. The passband extends from 2.85 to 11.3 GHz with stopband of width 18 GHz and depth greater than 18 dB. The variation of group delay is less than 0.42 ns in the passband. The proposed structure is small in size measuring 11.08 × 11.7 mm².

KEYWORDS:

• Bandpass filter (BPF)
• Complementary split ring resonator (CSRR)
• Defected ground structure (DGS)
• Split ring resonators (SRR)
• Ultra-wideband (UWB)

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Abu Nasar Ghazali

Abu Nasar Ghazali received his BTech degree in Electronics & Communication Engineering (ECE) from SRM University, Chennai, in 2008 and ME degree in Microwave Engineering from Birla Institute of Technology (BIT) Mesra, in 2010 where he was a GATE scholar. He completed his doctorate in 2014 from BIT Mesra. He worked as an Assistant Professor in the Department of ECE at the Manav Rachna College of Engineering, Haryana, in 2010 and is currently an Assistant Professor at the BIT Mesra, Patna campus. He is an Associate member, The Institution of Engineers (IEI), India and member of IEEE. He has published quite a few papers in peer-reviewed journals and conferences. His main research interests are UWB filters, Defected Ground Structures, Microstrip filters and Microwave circuit components.

E-mail: [email protected]

Mohd. Sazid

Mohammad Sazid received his BTech degree in Electronics & Communication Engineering (ECE) from Uttar Pradesh Technical University in 2011 and ME degree in Wireless Communication Engineering from BIT Mesra, in 2015 where he was a GATE scholar. He is currently working as an Assistant Professor in the Department of ECE at the Noida Institute of Engineering & Technology. He has published a couple of papers in SCI indexed journals. His main research interests are UWB filters, Microstrip filters and Microwave circuit components.

E-mail: [email protected]