1. Wide tunable range bandpass filter with three transmission zeros.
- Author
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Tian, Mingen, Long, Zhihe, Feng, Lijun, He, Leilei, and Zhang, Tianliang
- Subjects
- *
TRANSMISSION zeros , *BANDPASS filters , *DIODES , *BANDWIDTHS - Abstract
This paper proposes a reconfigurable bandpass filter with a wide tunable range, which is achieved by connecting two tunable passbands with switching diodes. A pair of transmission zeros (TZs) are introduced through the cross‐coupling structure to improve the passband selectivity of the filter, and one more transmission zero is added by the interdigital coupling line to enhance the out‐of‐band suppression and broaden the upper stopband. The simulation and experimental results show that the designed filter with an absolute bandwidth of 100 MHz realizes a tunable frequency band covering 1.5–3 GHz, corresponding to a fractional tunable range of 66.7%. The dimension of the fabricated filter is 0.32 λg × 0.34 λg. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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