Compact Bandstop Microstrip Line Filter Using U-Shaped Slot

Abstract

A bandstop filter is proposed, where the resonant element is a slot that is folded to the shape of the letter U and embedded into the microstrip line so that no extra width is required. Moreover, the folding of the slot reduces its length to ¼ the effective wavelength. This is a considerable size reduction in comparison with the filters using the resonant elements like rings or coupled short-circuited and open-circuited stubs. The designed prototype at the WLAN frequency of 2.45 GHz was investigated using the CST software package and showed low insertion loss at the passbands and high rejection across the stopband. The folding of the slot offered very low radiation at the stopband. The simulation results are validated by measurements on the fabricated prototypes.

KEYWORDS:

• Bandstop
• Metamaterials
• Microstrip filters
• Notch filters
• Slots

Additional information

Notes on contributors

Mamoon A. Al-Atrakchii

Mamoon A Al-Atrakchii obtained BSc degree in communication engineering from the College of Electronic Engineering/Mosul University on July 2012. Then he obtained his MSc degree in communication engineering from the College of Electronic Engineering/Ninevah University in 2019. Email: [email protected]

Khalil H. Sayidmarie

Khalil Hassan Sayidmarie is a professor of communication engineering at the Ninevah University. He received a BSc degree in electronic & communication Eng from Mosul University, Iraq, in 1976, and a PhD Degree from Sheffield University, UK in 1981. Then he joined the College of Engineering at Mosul University in 1983 and was promoted to full professor in 1992. He worked as head of the Electrical Engineering Department/University of Mosul for 9 years, and as the manager of the engineering consulting bureau/University of Mosul for 5 years. He was the acting dean of the College of Electronic Engineering at Mosul University 2002–2003. Sayidmarie worked as Professor of communication engineering at the College of Engineering, University of Amman/Jordan from Oct 2006 to Sept 2009, where he served as the dean of the Faculty of Engineering for the academic year 2008–2009. Sayidmarie has been professor of communication engineering at the college of electronic engineering/ Ninevah University since 2002. He was a recipient of a 6-month research scholarship from the Australian Endeavor in 2007 and a 4-month Endeavor Executive Fellowship in 2018, both spent at the ITEE/University of Queensland/ Australia. He was a visiting professor for one month at Bradford University. His research interests cover antennas, propagation, and microwaves, and he published over 125 papers in refereed journals and conferences. He supervised 40 PhD and MSc theses.

R. A. Abd-Alhameed

Raed Abd-Alhameed is a professor of Radio Frequency Engineering at the University of Bradford, UK. He has long years’ research experience in the areas of radio and sensor design, signal processing, propagations, antennas and electromagnetic computational techniques, and published over 600 academic journal and conference papers; in addition, he is co-authors of four books and several book chapters. At present, he is the leader of radio frequency, signal processing and communications system research group. He is a principal investigator for several funded applications to EPSRCs and leader of several successful knowledge transfer programs such as with Arris plc, Yorkshire Water plc, Harvard Engineering plc, IETG ltd, Seven Technologies Group, Emkay Ltd, and Two World Ltd. He has also been a co-investigator in several funded research projects including (1) H2020 MARIE Skodowska-CURIE ACTIONS: Innovative Training Networks “Secure Network Coding for Next Generation Mobile Small Cells 5G-US”, (2) Nonlinear and demodulation mechanisms in biological tissue (Dept of Health, Mobile Telecommunications & Health Research Programme and (3) Assessment of the Potential Direct Effects of Cellular Phones on the Nervous System. He was awarded the Business Innovation Award for his successful KTP with Pace and Datong companies on the design and implementation of MIMO sensor systems and antenna array design for service localizations. Professor Abd-Alhameed has also been elected as UK panel member for the International Union of Radio Science (URSI), Commission K from 2018. His interests are in computational methods and optimizations, wireless and mobile communications, sensor design, and RF design applications. He is the Fellow of the Institution of Engineering and Technology, Fellow of Higher Education Academy, and a Chartered Engineer. Email: [email protected]