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Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator
Science Discovery
Volume 7, Issue 1, February 2019, Pages: 45-49
Received: Apr. 19, 2019; Published: May 23, 2019
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Authors
Zhong Lunjie, State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China
Zuo Qiliang, State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China
Xu Jinping, State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China
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Abstract
A lowpass filter with wide stopband based on stepped impedance hairpin resonator is proposed. Multiple transmission zeros are created in the stopband region by different size T-shaped resonator to achieve wide stopband. A lowpass filter with 3dB cutoff frequency (fc) at 3.2GHz is designed, simulated and fabricated. Experimental results indicate that stopband can be extended to more than 7fc with a rejection level of 20dB after loading T-shaped resonator. The insertion loss is lower than 0.4dB and return loss is better than 16dB in the passband. Excluding the feed lines, the size of the filter is less than 0.26λg X 0.06λg. The modified filter is of good value in engineering application for its small size, sharp cutoff frequency response and wide stopband.
Keywords
Hairpin Resonator, T-shaped Resonator, Lowpass Filter, Wide Stopband
To cite this article
Zhong Lunjie, Zuo Qiliang, Xu Jinping, Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator, Science Discovery. Vol. 7, No. 1, 2019, pp. 45-49. doi: 10.11648/j.sd.20190701.20
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