Design of a Compact Wideband Filtering Power Divider with Improved Isolation
Keywords:
Filtering power divider, synthesis design, tri-mode resonator, wide bandwidthAbstract
A novel design of wideband filtering power divider (FPD) with high selectivity, good isolation and widen upper stopband is presented in this paper. A new topology is proposed by adding an isolation resistor between two tri-mode resonators to guarantee the isolation. Besides, owing to the intrinsic characteristics of tri-mode resonators and coupled lines with one of them terminated by an open-circuited stub, four transmission zeros (TZs) can be generated outside the operating band to improve the signal selectivity. For demonstration, a FPD operating at 2.35 GHz with 3-dB fractional bandwidth of 25.6% is designed, fabricated and measured. The measured isolation is better than 15.5 dB and the upper stopband is extended to 7.6 GHz (3.23f0) with a rejection level of 20 dB.
Downloads
References
R. Mirzavand, M. Honari, A. Abdipour, and G. Moradi, “Compact microstrip Wilkinson power dividers with harmonic suppression and arbitrary power division ratios,” IEEE Trans. Microw. Theory Tech., vol. 61, no. 1, pp. 61-68, Jan. 2013.
K. J. Song, “Compact filtering power divider with high frequency selectivity and wide stopband using embedded dual-mode resonator,” Electron. Lett., vol. 51, no. 6, pp. 495-497, Mar. 2015.
S. W. Wong and L. Zhu, “Ultra-wideband power dividers with good isolation and improved sharp roll-off skirt,” IET Microw. Antennas Propag., vol. 3, no. 8, pp.1157-1163, Feb. 2009.
B. Zhang and Y. A. Liu, “Wideband filtering power divider with high selectivity,” Electron. Lett., vol. 51, no. 23, pp. 1950-1952, Nov. 2015.
J. Y. Shao, S. C. Huang, and Y. H. Pang, “Wilkinson power divider incorporating quasielliptic filters for improved out-of-band rejection,” Electron. Lett., vol. 59, no. 11, pp. 2848-2855, Nov. 2011.
C. F. Chen and C. Y. Lin, “Compact microstrip filtering power dividers with good in-band isolation performance,” IEEE Microw. Wireless Compon. Lett., vol. 24, no. 1, pp. 17-19, Jan. 2014.
S. F. Chao and W. C. Lin, “Filtering power divider with good isolation performance,” Electron. Lett., vol. 50, no. 11, pp. 815-817, May 2014.
P. Cheong, K. I. Lai, and K. W. Tam, “Compact Wilkinson power divider with simultaneous bandpass response and harmonic suppression,” IEEE MTT-S International Microwave Symposium Digest, vol. 23, no. 3, pp. 1588-1591, May 2010.
X. Y. Zhang, K. X. Wang, and B. J. Hu, “Compact filtering power divider with enhanced secondharmonic suppression,” IEEE Microw. Wireless Compon. Lett., vol. 23, no. 9, pp. 483-485, Sep. 2013.
D. M. Pozar, Microwave Engineering. 3rd ed., New York: Wiley, 2005.
