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Open AccessArticle

An Ultra-Wideband Bandpass Filter with a Notch Band and Wide Upper Bandstop Performances

School of Information Engineering, Putian University, Putian 351100, China
Graduate Institute of Materials Engineering, National Pingtung University of Science and Technology, Pingtung County 912, Taiwan
Microelectronics and Department of Electrical Engineering, National Cheng Kung University, Tainan 701, Taiwan
Author to whom correspondence should be addressed.
Electronics 2019, 8(11), 1316;
Received: 20 October 2019 / Revised: 1 November 2019 / Accepted: 4 November 2019 / Published: 8 November 2019
(This article belongs to the Special Issue Applications of Electromagnetic Waves)
This paper presents an ultra-wideband bandpass filter (UWB-BPF) with a notch band and a wide upper stopband. Two pairs of half-wavelength high-impedance line resonators tightly and strongly coupled to the input/output lines are used to provide the wideband responses. The first UWB responses of 3.4–5.0 GHz and the second UWB of 6.0–10.0 GHz are designed independently first and then combined together for the application of a direct-sequence ultra-wideband bandpass (DS-UWB) system. Without using any extra bandstop structure, a notch band at 5.2 GHz can be obtained. The fabricated UWB-BPF with a compact circuit size exhibits good passband performances including insertion losses of 1 ± 0.3 and 2 ± 0.4 dB for first and second passbands, respectively, a high isolation at 5.2 GHz with an attenuation level of 22.7 dB, and wide upper stopband responses from 11 GHz to 19 GHz, simultaneously. The measured results also exhibit good agreement with the simulated results. View Full-Text
Keywords: ultra-wideband; bandpass filter; half-wavelength resonator; insertion loss ultra-wideband; bandpass filter; half-wavelength resonator; insertion loss
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MDPI and ACS Style

Weng, M.-H.; Hsu, C.-W.; Lan, S.-W.; Yang, R.-Y. An Ultra-Wideband Bandpass Filter with a Notch Band and Wide Upper Bandstop Performances. Electronics 2019, 8, 1316.

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