Design of a Planar Compact Dual-band Bandpass Filter with Multiple Transmission Zeros Using a Stub-loaded Structure

Wei, Guang Yong; Wang, Yun Xiu; Liu, Jie; Li, Hai Ping

doi:10.2528/pierl22122603

Cited by 3 publications

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A dual-wideband bandpass filter with closely spaced passbands using coupled lines and shunt transmission lines loaded with end-connected coupled lines

Alazemi

2024

Int. J. Microw. Wireless Technol.

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A fourth-order bandpass filter with dual-wide passbands is proposed in this article. The novelty of the proposed work is the realization of a dual-band bandpass filter with closely spaced passbands, wide passband bandwidth, high rejection between the passbands, using a novel combination of open stub tapped series coupled lines (CLs) and shunt transmission line loaded with end connected CLs. The characteristics of the proposed dual-wideband bandpass filter are investigated by adopting even–odd mode analysis. The transmission zeros generated by the transmission line loaded with an end-connected CL and open stub are utilized to achieve a high skirt rate. A rejection better than 55 dB is achieved with a single transmission zero between the two passbands indicating high isolation and close passbands. The dual-wideband filter is designed and manufactured to operate at 1.33 and 2.32 GHz. The experimented 3-dB fractional bandwidths of the two pass frequency bands are 40.6% and 24.13%. The proposed filter’s tested frequency responses agree well with simulated results. The proposed device can be used in various applications such as telecommunications, satellite communications, radar systems, imaging, and spectroscopy.

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