A Design of Compact Ultra Wideband Coupler for Butler Matrix

作者：Muklas Nor Salehah Binti; Rahim Sharul Kamal Abdul; Seman Norhudah; Zaidel Dyg Norkhairunnisa Abang; Tan Kim Geok; Reza Ahmed Wasif^*

来源：Wireless Personal Communications, 2013, 70(2): 915-926.

DOI：10.1007/s11277-012-0729-9

• UWB coupler
• Directional coupler
• Microstrip
• Butler Matrix
• Antenna

A design of 3 dB compact ultra wideband (UWB) coupler for a 4 x 4 Butler Matrix, which is operating between 3 and 11 GHz 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 0.8 mm thick FR4 substrates and it occupies the dimension of 30 mm x 15 mm. 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.

• 出版日期2013-5