Compact Microstrip Branch-line Coupler with Wideband Harmonic Suppression
关键词:
Branch-line coupler, microstrip, harmonic suppression摘要
one compact microstrip branch-line coupler with wideband harmonic suppression is presented in this letter. The new structure has two significant advantages, which not only effectively reduces the occupied area to 26.5% of the conventional branch-line coupler at 0.96 GHz, but also has high 6th harmonic suppression performance. The measured results indicate that a bandwidth of more than 120 MHz has been achieved while the phase difference between S21 and S31 is within 90° ± 1°. The measured bandwidth of |S21| and |S31| within 3 ± 0.5 dB are 145 MHz and 150MHz, respectively. Furthermore, the measured insertion loss is comparable to that of a conventional branch-line coupler. The new coupler can be easily implemented by using the standard printed-circuit-board etching processes and is very useful for wireless communication systems.
##plugins.generic.usageStats.downloads##
参考
D. M. Pozar, Microwave Engineering, 3rd ed. New York: Wiley, Ch. 7, pp. 333-337, 2005.
A. Mohra, A. F. Sheta, S. F. Mahmoud, “New Compact 3 dB 0/180 Microstrip Coupler Configurations,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 19, no. 2, pp. 108-112, July 2004.
B. Xiao, J. Hong, B. Wang, “A Novel UWB Out-of-phase Four-way Power Divider,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 26, no. 10, pp. 863-867, Oct. 2011.
K. A. Shamaileh, A. Qaroot, N. Dib, A. Sheta, “Design of Miniaturized Unequal Split Wilkinson Power Divider with Harmonics Suppression using Non-uniform Transmission Lines,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 26, no. 6, pp. 530–538, June. 2011.
K. W. Eccleston and S. H. M. Ong, “Compact Planar Microstripline Branch-line and Rat-race Couplers,” IEEE Trans. Microw. Theory Tech., vol. 51, no. 10, pp. 2119-2125, Oct. 2003.
P. Mondal, and A. Chakrabarty, “Design of Miniaturized Branch-line and Rat-race Hybrid Couplers with Harmonics Suppression,” IET Microw. Antennas Propag., vol. 3, no. 1, pp. 109-116, Jan. 2009.
J. Gu, and X. Sun, “Miniaturization and Harmonic Suppression of Branch-line and Rat-race Hybrid Coupler using Compensating Spiral Compact Micostrip Resonant Cell,” IEEE MTT-S Int. Dig., pp. 1211-1214, 2005.
J. Wang, B.-Z. Wang, Y.-X. Guo, L. C. Ong, and S. Xiao, “A Compact Slow-wave Microstrip Branch-line Coupler with High Performance,” IEEE Microw. Wirel. Compon. Lett., vol. 17, no. 7, pp. 501-503, Jul. 2007.
V. K. Velidi, B. Patel, S. Sanval, “Harmonic Suppressed Compact Wideband Branch-line Coupler using Unequal Length Open-stub Units,” International Journal of RF and Microwave Computer-Aided Engineering., vol. 21, no. 1, pp. 115-119, Jan. 2011.
K. Y. Tsai, H. S. Yang, J. H. Chen, and Y. J. E. Chen, “A Miniaturized 3 dB Branch-line Hybrid Coupler with Harmonics Suppression,” IEEE Microw. Wirel. Compon. Lett., vol. 21, no. 10, pp. 537-539, Oct. 2011.
V. K. Velidi, A. Pal, S. Sanyal, “Harmonics and Size Reduced Microstrip Branch-line Baluns using Shunt Open-stubs,” International Journal of RF and Microwave Computer-Aided Engineering., vol. 21, no. 2, pp. 115-119, Mar. 2011.
A. S. Al-Zayed, Z. M. Hehjazi, A. S. Mohra, “A Microstrip Directional Coupler with Tight Coupling and Relatively Wideband using Defected Ground Structure,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 25, no. 10, pp. 577-587, Oct. 2010.
J. S. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications. New York: Wiley, Ch. 4, 2001.
