Implementation of Slot-Coupled Broadband Butler Matrix Based on Multiple Layered Microstrip Transmission line
2017, 12(4), pp.581-590
DOI : 10.34163/jkits.2017.12.4.012
Publisher : Korea Knowledge Information Technology Society
Research Area : Interdisciplinary Research
-
Switched beamforming network required for multiple input multiple output (MIMO) technology and smart antenna technology can adaptively adjust the beam direction of the array antenna according to the moving direction of the mobile station. Therefore, the proposed beamforming network called Butler matrix is a power feeding system capable of forming beams in various directions by adjusting the magnitude and phase of the feed signals applied to the array antenna. In this paper, a combination of microstrip slot-coupled directional couplers and slot-coupled crossovers including 45° phase shifter has been employed to expand the bandwidth of the 4x4 Butler matrix and reducing the number of conventional crossovers. The proposed slot-coupled components consist of two rectangular microstrip transmission lines (RMTLs) facing each other at the top and bottom layer and a common ground. The coupling between these RMTLs is achieved by cutting a rectangular slot in the ground plane which is located at the middle layer. A common ground is in a position between the two dielectrics. From the simulation and measurement results, the proposed Butler matrix has a good performance of broad fractional bandwidth of 43%, return loss of 15.5dB, insertion loss of 6.5±0.4dB and progressive phase shift of -45, 135, -135, 45 ±5° in 2.5~2.7GHz operating frequency band.
-
[journal] J. Butler / 1961 / Beamforming matrix simplifies design of electrically scanned antennas / Electronics Design 9 : 170~173
[journal] J. H. Winter / 1998 / Smart antennas for wireless systems / IEEE Personal Communications 1 : 23~27
[thesis] G. A. Adamidis / 2002 / Development of simple smart array systems / Aristotle University of Thessaloniki
[confproc] I. Sfar / 2014 / Design of a 4×4 butler matrix for beamforming antenna applications / Proceedings of 2014 Neduterranean Microwave Symposium (MMS2014) : 1~4
[confproc] M. M. Alam / 2009 / Microstrip antenna array with four port butler matrix for switched beam base station application / ICCIT ’09 12 th International Conference on Computer and Informational Technology
[confproc] H. Nachouane / 2014 / Broadband 4×4 butler matrix using wideband 90° hybrid couplers and crossovers for beamforming networks / 2014 International Conference on Multimedia Computing and Systems (ICMCS) : 1444~1448
[confproc] S. Z. Ibrahim / 2009 / Wideband butler matrix in microstrip-slot technology / Proceeding 2009 Asia Pacific Microwave Conference : 2104~2107
[journal] S. Karamzadeh / 2015 / Compact and broadband 4⨉4 SIW butler matrix with phase and magnitude error reduction / IEEE Microwave Wireless Components Letters 25(12) : 772~774
[journal] A. A. M. Ali / 2011 / Design and implementation of two-layer compact wideband butler matrices in SIW technology for Ku-band applications / IEEE Transactions on Antennas Propagation 59(2) : 503~512
[journal] T. Djerafi / 2012 / A low-cost wideband 77-GHz planar butler matrix in SIW technology / IEEE Transactions on Antennas and Propagation 60(10) : 4949~4954
[journal] S. Karamzadeh / 2015 / Compact and broadband 4⨉4 SIW butler matrix with phase and magnitude error reduction / IEEE Microwave Wireless Components Letters 25(12) : 772~774
[confproc] A. Talbi / 2013 / A compact 4×4 butler matrix for UWB applications / Proc. 2013 IEEE Antennas and Propagation Society Int. Symposium(APSURSI) : 1010~1011
[confproc] G. Tudosie / 2006 / A compact LTCC butler matrix realization for phased array applications / 2006 IEEE MTT-S International Microwave Symposium Digest : 441~444
[confproc] G. Tudosie / 2008 / A novel modularized folded highly compact LTCC butler matrix / 2008 IEEE MTT-S International Microwave Symposium Digest : 691~694
[journal] M. Nedil / 2008 / Novel butler matrix using CPW multilayer technology / IEEE Transaction on Microwave Theory and Techniques 54(1) : 499~507
[confproc] M. Nedil / 2014 / Novel UWB CB-CPW butler matrix for wireless applications / Proc. 2014 IEEE Antennas and Propagation Society International Symposium(APSURSI) : 1800~1801
[confproc] Y. H. Lee / 2017 / Analysis of slot-coupled microstrip components for wideband butler matrix / International Conference on ELectronics, Information, and Communication (ICEIC) 2017 S22 : 482~484
[confproc] D. H. Lee / 2017 / Broadband 44 butler matrix with multilayer slot-coupled microstrip transmission lines / International Conference on ELectronics, Information, and Communication (ICEIC) 2017 P01 : 638~641
-
157 Viewed
Print this page
Download PDF