References
- 3GPP LTE Encyclopedia. An introduction to LTE. Online only. https://sites.google.com/site/lteencyclopedia/home Retrieved 3 December 2010.
- Butler, J., & R. Lowe. 1961. Beam-forming matrix simplifies design of electronically scanned antennas. Electron. Design 9:170–173.
- Djerafi, T., & K. Wu. 2012. A low-cost wideband 77-GHz planar Butler matrix in SIW technology. IEEE Trans. Antennas Propag. 60:4949–4954.
- Egami, S., & M. Kawai. 1987. An adaptive multiple beam system concept. IEEE J. Select. Areas Comm. 5:630–636.
- Gandini, E., M. Ettorre, R. Sauleau, & A. Grbic. 2013. A lumped-element unit cell for beam-forming networks and its application to a miniaturized Butler matrix. IEEE Trans. Microw. Theory Tech. 61:1477–1487.
- Kang, D.-W., J.-G. Kim, B.-W. Min, & G. M. Rebeiz. 2009. Single and 4-element-band transmit/receive phased-array silicon RFICs with 5-bit amplitude and phase control. IEEE Trans. Microw. Theory Tech. 57:3534–3543.
- Lee, J. K., & K. Chang. 2011. Dual-band switched beam array fed by dual-band Butler matrix. Electron. Lett. 47:1164–1165.
- Lin, T.-H., S.-K. Hsu, & T.-L. Wu. 2013. Bandwidth enhancement of 4 × 4 Butler matrix using broadband forward-wave directional coupler and phase difference compensation. IEEE Trans. Microw. Theory Tech. 61:4099–4109.
- Ren, H., J. Shao, B. Arigong, R. Zhou, & H. Zhang. 2013. A dual-band phased array antenna system based on Butler matrix network. IEEE Antennas and Propagation Soc. Int. Symp., 7–13 July 2013, Orlando, FL, USA, 1218–1219.
- Wong, F.-L., & K.-K. M. Cheng. 2011. A novel, planar, and compact crossover design for dual-band applications. IEEE Trans. Microw. Theory Tech. 59:568–573.
- Wu, Y., Q. Liu, J. Shen, & Y. Liu. 2013. A novel wide-band hybrid coupler using coupled-line power divider and improved coupled-line phase shifter. J. Electromagn. Waves Appl. 27:374–384.
- Wu, Y., S. Zheng, S. Leung, Y. Liu, & Q. Xue. 2014. An analytical design method for a novel dual-band unequal coupler with four arbitrary terminated resistances. IEEE Trans. Ind. Electron. 61:5509–5516.