Design of an UWB Bandpass Filter Using Dual MMR with Highly Attenuated Upper Stopband Using DGS

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Aditi Sengupta 1,* Somdotta Roy Choudhury 2 Santanu Das 3

1. Department of Electronics & Communication Engineering, Guru Nanak Institute of Technology, Kolkata- 700114, India

2. Department of Electronics & Telecommunication Engineering, Ramrao Adik Institute of Technology, D. Y. Patil University Campus, Navi Mumbai-400706, India

3. Department of Electronics & Telecommunication Engineering, Indian Institute of Engineering Science & Technology, Shibpur, Howrah -711103, India

* Corresponding author.


Received: 15 Sep. 2017 / Revised: 15 Nov. 2017 / Accepted: 17 Jan. 2018 / Published: 8 May 2018

Index Terms

UWB (ultra-wideband), BPF (band pass filter), MMR (multimode resonator), DGS (Defected ground structure), Stopband


A miniature sized microstrip UWB (ultra wideband) BPF (bandpass filter) having highly attenuated upper stop band performance using a dual MMR (multimode resonator) and the DGS (defected ground structure) is proposed. Combining these two topologies, a prototype of the proposed UWB BPF is fabricated using FR-4 substrate of 1.6 mm thickness with dielectric constant of 4.4. This BPF is modelled and simulated using Ansoft high frequency structure simulator (HFSS) Software. The simulated and measured results show a wide FBW (fractional bandwidth) of 119% .The insertion loss is less than -1.0 dB throughout the pass band of 2.78 to 10.95 GHz. All the ripples of return loss are lower than -14 dB in the passband. The BPF has a high rejection of more than -30 dB in the upper stop band up to 16.8 GHz. The simulated and measured group delays variation in the passband are found to be less than 0.2 ns. The overall length of the resonator is 7 mm.

Cite This Paper

Aditi Sengupta, Somdotta Roy Choudhury, Santanu Das," Design of an UWB Bandpass Filter Using Dual MMR with Highly Attenuated Upper Stopband Using DGS", International Journal of Wireless and Microwave Technologies(IJWMT), Vol.8, No.3, pp. 58-69, 2018. DOI: 10.5815/ijwmt.2018.03.06


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