Ultrawide stopband low-pass filter using triangular resonators defected ground

Hany Taher

Journal of Electromagnetic Waves and Applications, 2014, vol. 28, issue 5, 542-550

Abstract: In this article, a novel complementary triangular split ring resonator (CTSRR) using defected ground structure (DGS) is introduced. The unit is implemented in microstrip technology. The CTSRR has unique filter characteristics, including six dimension-dependent finite attenuation poles with wide bandgap, very high attenuation rate, and very low level of passband ripples. CTSRR units with different dimensions CTSRR units are cascaded together to design a high-performance low-pass filter (LPF) with a cutoff frequency (fc) of 1.80 GHz. The designed LPF exhibits an attenuation rate of 250 dB/GHz and passband ripples of less than 0.30 dB. Moreover, it has a wide 20-dB stopband at up to 16.5 times fc. To our knowledge, this is the best obtained stopband value among the published results until now. The designed filter has been fabricated and validated using small signal parameter measurements. Excellent agreement is noticed between transmission coefficient measurements and its simulated counterpart using electromagnetic simulator.

Date: 2014
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DOI: 10.1080/09205071.2013.879048

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