naa a22 4500 510794033 CHVBK 20180411083329.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11277-012-0729-9 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0729-9 A Design of Compact Ultra Wideband Coupler for Butler Matrix [Elektronische Daten] [Nor Binti Muklas, Sharul Rahim, Norhudah Seman, Dyg Zaidel, Kim Tan, Ahmed Reza] A design of 3 dB compact ultra wideband (UWB) coupler for a 4×4 Butler Matrix, which is operating between 3 and 11GHz frequency range, is presented in this paper. The proposed design uses multilayer technology that allows having a compact and broad bandwidth coupler. The design uses elliptically shaped broadside coupled strips and a slot created in a common ground plane of two dielectric substrates with the same shape. The design then being fabricated on 0.8mm thick FR4 substrates and it occupies the dimension of 30mm ×15mm. The simulation and experimental results show a good performance in terms of bandwidth, which covers the entire UWB operation. In addition, detailed analysis of air gap effect for S-parameters and phase difference of the designed coupler is presented in this study. Springer Science+Business Media, LLC., 2012 UWB coupler nationallicence Directional coupler nationallicence Microstrip nationallicence Butler Matrix nationallicence Antenna nationallicence Binti Muklas Nor Faculty of Electrical Engineering, Wireless Communication Centre, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia aut Rahim Sharul Faculty of Electrical Engineering, Wireless Communication Centre, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia aut Seman Norhudah Faculty of Electrical Engineering, Wireless Communication Centre, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia aut Zaidel Dyg Faculty of Electrical Engineering, Wireless Communication Centre, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia aut Tan Kim Faculty of Engineering and Technology, Multimedia University, Jalan Ayer Keroh Lama, Bukit Beruang, 75450, Melaka, Malaysia aut Reza Ahmed Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia aut Wireless Personal Communications Springer US; http://www.springer-ny.com 70/2(2013-05-01), 915-926 0929-6212 70:2<915 2013 70 11277 https://doi.org/10.1007/s11277-012-0729-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0729-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Binti Muklas Nor Faculty of Electrical Engineering, Wireless Communication Centre, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia aut NATIONALLICENCE 700 1- Rahim Sharul Faculty of Electrical Engineering, Wireless Communication Centre, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia aut NATIONALLICENCE 700 1- Seman Norhudah Faculty of Electrical Engineering, Wireless Communication Centre, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia aut NATIONALLICENCE 700 1- Zaidel Dyg Faculty of Electrical Engineering, Wireless Communication Centre, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia aut NATIONALLICENCE 700 1- Tan Kim Faculty of Engineering and Technology, Multimedia University, Jalan Ayer Keroh Lama, Bukit Beruang, 75450, Melaka, Malaysia aut NATIONALLICENCE 700 1- Reza Ahmed Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 70/2(2013-05-01), 915-926 0929-6212 70:2<915 2013 70 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer