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ABSTRACT
An ultra-wideband (UWB) bandpass filter with extended upper-stopband on multilayer liquid-crystal-polymer (LCP) substrate is presented in this paper. The proposed filter is designed to select the frequency band from 1.0 to 20 GHz. The filter consists of two parallel-coupled stub-loaded resonators separated by a composite lowpass filter. The composite lowpass filter is implemented to obtain a very wide rejection band. The proposed filter is fabricated using multilayer LCP technology. Excellent agreement between expected and measured results of the filter is obtained. The measurement results show that the fabricated filter has a fractional bandwidth of 180% and a very low insertion loss of less than 0.6 dB at center frequency of 10.5 GHz. The measured filter has a wide stopband and an excellent rejection level higher than 40 dB.
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No potential conflict of interest was reported by the authors.
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Notes on contributors
Hussein Shaman
Hussein N. Shaman received his B.Eng. and PhD degrees in Electrical Engineering from Heriot-Watt University in 2005 and 2008, respectively. In 2010, he joined the National Satellite Technology Center at King Abdulaziz City for Science and Technology, where he worked as the systems engineer for Saudi SAT-4 satellite. He is now the head of Systems Engineering Office in the Advanced Sensors and Electronic Defense Center (ASED) at KACST, Riyadh, Saudi Arabia. He is a member of the Institute of Electrical and Electronics Engineer (IEEE) and the Institute of Engineering and Technology (IET). He is also a member of INCOSE and a senior member of AIAA. He has authored or co-authored over 25 research articles in scientific journals and IEEE conference proceedings. His current interests involve RF/microwave devices, such as antennas and filters, for wireless communications, satellite, and radar systems.
Email: [email protected]
Sultan Almorqi
Sultan K. Almorqi obtained a bachelor degree in electrical and electronics engineering at the Heriot-Watt University in Edinburgh in Scotland. He went on to complete his PhD at Heriot-Watt in 2009. He returned to Saudi Arabia and worked at the Border Guard, Ministry of Interior (MOI). In 2010, he joined KACST as Radar systems engineer in the newly established centre for Advanced Sensors and Electronic Defence (ASED). He was promoted to deputy director Scientific Affairs in 2011. In June 2012, he became the director of ASED. He published extensively on folded waveguide resonators and has published and co-published 14 papers. He is member of the IEEE society for electrical and electronic engineers, the Communications Society of America (MCS), the Saudi Council of Engineers, a member of the Board of Directors of the Saudi Telecommunications Engineering and Chairman of Scientific and cultural Division in Saudi Telecommunications Society (STS). He was elected to be the president of Saudi AOC Chapter in mid of 2013.
Email: [email protected]
Ahmed AlAmoudi
Ahmed O. AlAmoudi received his PhD in Electrical Engineering from the University of Bradford in 1999. His doctoral dissertation was in optimal control of gird connected PV systems using Artificial Neural Networks (ANN). In 2003, he joined space research, participating with the team in the design of Saudi SAT II satellite. From 2004, he participated in establishing the Electronic Communications and Photonics Program at KACST, then worked as deputy director for Administrative Affairs of Electronics Communications and Photonics Program at KACST from 2005 to 2011. From 2011 to 2014, he worked as the deputy manager of Administrative Affairs of Advanced Sensor and Electronic Defense (ASED) at KACST. Currently, he is managing the planning office at National Centre for Sensors and Defense Systems Technologies (NCSDST), also he is a senior research fellow in the Department of Electronics and Electrical Engineering at the University of Sheffield. There, he is co-supervising PhD students in the fields of Electromagnetics and Antenna design. He has authored or coauthored some journal and conference papers. In addition, he was the principal instigator of almost five research projects. His current interests involve sensors for body sensors networks, smart sensors and smart grids solutions. He also has some interests in Renewable and Sustainable Energy Solutions.
Email: [email protected]