Miniaturized LTCC Bandpass Filter with Harmonic Supression
Keywords:
Harmonic suppression, LTCC, spurline, transmission zeroAbstract
This paper presents a harmonicsuppressed bandpass filter using a 3-dimensional (3-D) half-wavelength transmission line resonator, which is fabricated using low temperature co-fired ceramic (LTCC) technology. Owing to the distributed-element method in this 3-D design, the spurlines can be easily etched on the coupled feed lines to generate an extra transmission zero in the stopband without enlarging the circuit size. As a result, the second harmonic can be rejected to a great extent. For demonstration, a pair of two-order LTCC bandpass filters centered at 2.45 GHz with/without spurlines are designed using the compact 3-D resonator, and the size of the circuits is only 4.4×4.2×1.6 mm3
Downloads
References
X. Y. Zhang and Q. Xue, “Harmonicsuppressed bandpass filter based on discriminating coupling,” IEEE Microw. Wireless Compon. Lett., vol. 19, no. 11, pp. 695-697, Nov. 2009.
A. Torabi and K. Forooraghi, “Miniature harmonic-suppressed microstrip bandpass filter using a triple-mode stub-loaded resonator and spur lines,” IEEE Microw. Wireless Compon. Lett., vol. 21, no. 5, pp. 255-257, May 2005.
W. H. Tu and K. Chang, “Compact microstrip bandstop filter using open stub and spurline,” IEEE Microw. Wireless Compon. Lett., vol. 15, no. 4, pp. 268-270, Apr. 2005.
M. Hayati and S. Roshani, “A novel wilkinson power divider using open stubs for the suppression of harmonics,” Appl. Comp. Electro. Society (ACES) Journal, vol. 28, no. 6, pp. 530-538, Jun. 2013.
J.-S. Park, J.-S. Yun, and D. Ahn, “A design of the novel coupled-line bandpass filter using defected ground structure with wide stopband performance,” IEEE Trans. Microw. Theory Tech., 50, no. 7, pp. 2037-2043, Sep. 2002.
L. Gao, X. Y. Zhang, and Q. Xue, “Miniaturised bandpass filter using novel feeding structure for harmonic suppression,” Electron. Lett., vol. 48, no. 22, pp. 1414-1415, Oct. 2012.
W.-S. Tung, Y.-C. Chiang, and J.-C. Cheng, “A new compact LTCC bandpass filter using negative coupling,” IEEE Microw. Wireless Compon. Lett., vol. 15, no. 10, pp. 641-643, Oct. 2005.
G. Brzezina, L. Roy, and L. MacEachern, “Design enhancement of miniature lumpedelement LTCC bandpass filters,” IEEE Trans. Microw. Theory Tech., vol. 57, no. 4, pp. 815- 823, Apr. 2009.
C.-W. Tang, “Harmonic-suppression LTCC filter with the step-impedance quarterwavelength open stub,” IEEE Trans. Microw. Theory Tech., vol. 52, no. 2, pp. 617-624, Feb. 2004.
J.-X. Chen, C. Shao, Q. Y. Lu, H. Tang, and Z. H. Bao, “Compact LTCC balanced bandpass filter using distributed-element resonator,” Electron. Lett., vol. 49, no. 5, pp. 354-356, Feb. 2013.
J. S. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, New York: Wiley, 2001.
C.-M. Tsai, S.-Y. Lee, and C.-C. Tsai, “Performance of a planar filter using a 0° feed structure,” IEEE Trans. Microw. Theory Tech., vol. 50, no. 10, pp. 2362-2367, Oct. 2002.
X. J. Zhang, H. H. Zhang, and X. P. Ma, “Design of compact wideband LTCC filter using pentagonal-shaped SIR,” Electron. Lett., vol. 47, no. 5, pp. 327-328, Mar. 2011.
M. Höft and T. Shimamura, “Design of symmetric trisection filters for compact lowtemperature co-fired ceramic realization,” IEEE Trans. Microw. Theory Tech., vol. 58, no. 1, pp. 165-175, Jan. 2010.
Y.-H. Jeng, S.-F. R. Chang, and H.-K. Lin, “A high stopband-rejection LTCC filter with multiple transmission zeros,” IEEE Trans. Microw. Theory Tech., vol. 54, no. 2, pp. 633- 637, Feb. 2006.
C. W. Tang and H. C. Hsu, “Development of multilayered bandpass filters with multiple transmission zeros using open-stub/shortstub/serial semilumped resonators,” IEEE Trans. Microw. Theory Tech., vol. 58, no. 3, pp. 624-634, Mar. 2010.
V. Piatnitsa, E. Jakku, and S. Leppaevuori, “Design of a 2-pole LTCC filters for wireless communications,” IEEE Trans. Wireless Commun., vol. 3, no. 2, pp. 379-381, Mar. 2004.
