Chapter 6 Conclusion and Future Work
6.2 Future Work
In this dissertation, the double-diplexing configuration is widely used, but there is no analytical approach to determine the design parameters. Such an approach can be studied in the future to make the whole design more efficient. Moreover, based on the synthesized multi-band coupling matrix, some specific coupling scheme can be studied for its property in transmission zeros generation for the multi-band filter design. Moreover, some specific
126
two-mode resonators can be analyzed based on the coupling matrix and provide a systematic guide line in multi-band filter design. To use the diagnosis technique [143] to fine-tuning the EM performance of dual-band and multi-band filter, a automatic tuning can be achieved via Matlab-EM co-simulation.
To make the multi-band design flow more easy and convenient, a user-interface can be developed in Matlab. Users can enter the specifications, such as number of passband, filter order, return loss, and transmission zeros in each passband, and then they can describe the user-specific coupling scheme, and then the corresponding coupling matrix will be extracted. Moreover, while choose the prescribed layout, the initial design parameters can be obtained and then be optimized by the Matlab-EM co-simulation solver.
Thus, if we can complete all above steps, the requested layout will then be generated automatically. It will provide filter designers a fast and efficient design procedure.
127
References
[1] J. W. Baik, L, Zhu, Y. S. Kim, “Dual-mode dual-band bandpass filter using balun structure for single substrate configuration,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 11, pp. 613-615, Nov. 2010.
[2] E. E. Djoumessi and K. Wu, “Multilayer dual-mode dual-bandpass filter,” IEEE Microw. Wireless Compon. Lett., vol. 19, no. 1, pp. 21-23, Jan. 2009.
[3] F. C. Chen and Q. X. Chu, “Novel multistub loaded resonator and its application to high-order dual-band filters,” IEEE Trans. Microw. Theory Tech., vol. 58, no. 6, pp.
1551–1556, Dec. 2010.
[4] X. H. Wu, Q. X. Chi, and L. Fan, “Compact dual-band bandpass filter with controllable bandwidths,” in International Conference on Microwave and Millimeter Wave Technology, Chengdu, China, May 2010, pp. 1305–1307.
[5] S. Lee and Y. Lee, “A uniform coupled-line dual-band filter with different bandwidths,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 10, pp. 545-547, Oct.
2010.
[6] S. Lee and Y. Lee, “A planar dual-band filter based on reduced-length parallel coupled lines,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 1, pp. 16-18, Jan.
2010.
[7] C. X. Zhou, Y. X. Guo, S. L. Yan, and Z. L. Wang, “Dual-band UWB filter with LTCC technology,” Electron. Lett., vol. 47, no. 22, pp. 1230-1232, Oct. 2011.
[8] X. Y. Zhang, C. H. Chan, Q. Xue, and B. J. Hu, “Dual-band bandpass filter with controllable bandwidths using two coupling paths,” IEEE Microw. Wireless Compon.
Lett., vol. 20, no. 11, pp. 616-618, Nov. 2010.
[9] L. Wang, C. Zhao, C. Li, and X. Lin, “Dual-band bandpass filter using stub loaded resonators with multiple transmission zeros,” in 9th International Symposium on Antennas Propagation and EM Theory, Guangzhou, China, Nov. 2010, pp.
1208–1211.
[10] H. W. Deng, Y. J. Zhao, X. S. Zhang, W. Chen, and J. K. Wang, “Compact and high selectivity dual-band dual-mode microstrip BPF with single stepped-impedance resonator,” Electron. Lett., vol. 47, no. 5, pp. 326-327, Mar. 2011.
[11] H. W. Deng, Y. J. Zhao, L. Zhang, X. S. Zhang, and W. Zhao, “Dual-band BPF with DSIR and TSIR,” Electron. Lett., vol. 46, no. 17, pp. 1205-1206, Aug. 2010.
[12] W. S. Chang and C. Y. Chang, “Analytical design of microstrip short-circuit terminated stepped-impedance resonator dual-band filters,” IEEE Trans. Microw.
Theory Tech., vol. 59, no. 7, pp. 1730–1739, Jul. 2011.
[13] Z. Yang, L. Zhang, Z. Ma, and X. Yang, “A compact microstrip dual-mode dual-band
128
filter with source-load coupling,” in China-Japan Joint Microwave Conference, Hangzhou, China, Apr. 2011, pp. 1–4.
[14] W. P. Liu and Y. W. Tung, “Dual-band stepped-impedance resonant filter with dual-band admittance inverter,” in International Conference on Microwave and Millimeter Wave Technology, Chengdu, China, May 2010, pp. 1409–1493.
[15] M. L. Chuang, M. T. Wu, and S. M. Tsai, “Dual-band filter design using L-shaped stepped impedance resonators,” IET Microw. Antenna. P., vol. 4, no. 7, pp. 855–862, Jul. 2010.
[16] C. H. Tseng and H. Y. Shao, “Design of dual-band net-type bandpass filter,” in IEEE MTT-S Int. Microw. Symp. Dig., Anaheim, California, May 2010, pp. 572–575.
[17] M. A. Nikravan and Z. Atlasbaf, “Compact dual-band microstrip bandpass filter using folded linear tapered-line resonator,” in Proc. Asia-Pacific Microw. Conf., Yokohama, Japan, Dec. 2010, pp. 1755-1757.
[18] X. S. Zhang, H. W. Deng, L. Zhang, Y. J. Zhao, L. Qiang, “Compact dual-band BPF for GPS and WLAN with two dual-mode stepped impedance resonators,” in Global Mobile Congress, Shanghai, China, Oct. 2010, pp. 1-3.
[19] T. Jiang, C. Y. Liu, Y. S. Li, and J. Zhang, “A novel compact dual-band micro-strip band-pass filter design,” in International Conference on Wireless Communications and Signal Processing, Suzhou, China, Oct. 2010, pp. 1-4.
[20] K. S. Chin and J. H. Yeh, “Dual-wideband bandpass filter using short-circuited stepped-impedance resonators,” IEEE Microw. Wireless Compon. Lett., vol. 19, no. 3, pp. 155-157, Mar. 2009.
[21] F. Medina and F. Mesa, “Design of a Dual Band-Pass Filter Using Modified Folded Stepped-Impedance Resonators” in IEEE MTT-S Int. Microw. Symp. Dig., Boston, June 2009, pp. 857–860.
[22] Y. C. Chang, C. H. Kao, M. H. Weng, and R. Y. Yang, “Design of the compact dual-band bandpass filter with high isolation for GPS/WLAN applications,” IEEE Microw. Wireless Compon. Lett., vol. 19, no. 12, pp. 780-782, Dec. 2009.
[23] R. G. Garcia, J. M. Ferreras, and M. S. Renedo, “Signal-interference stepped-impedance-line microstrip filters and application to duplexers,” IEEE Microw.
Wireless Compon. Lett., vol. 21, no. 8, pp. 421-423, Aug. 2011.
[24] R. G. Garcia and M. S. Renedo, “Application of generalized bagley-polygon four-port power dividers to designing microwave dual-band bandpass planar filters,” in IEEE MTT-S Int. Microw. Symp. Dig., Anaheim, California, May 2010, pp. 580–583.
[25] R. G. Garcia, M. S. Renedo, B. Jarry, J. Lintignat, and B. Barelaud, “A class of microwave transversal signal-interference dual-passband planar filters,” IEEE Microw.
Wireless Compon. Lett., vol. 19, no. 3, pp. 158-160, Mar. 2009.
[26] M. D. Sindreu, G. Siso, J. Bonache, and F. Martin, “Planar multi-band microwave components based on the generalized composite right/left handed transmission line
129
concept,” IEEE Trans. Microw. Theory Tech., vol. 58, no. 12, pp. 3882–3891, Dec.
2010.
[27] S. Kahng, G. Jang, and J. Anguera, “Metamaterial dual-band bandpass filters using CRLH zero-order-resonators and improving its intermediate stopband,” in 4th European Conference on Antennas and Propagation, Barcelona, Spain, Apr. 2010, pp.
1–3.
[28] M. D. Sindreu, J. Bonache, and F. Martin, “Compact CPW dual-band bandpass filters based on semi-lumped elements and metamaterial concepts,” in Proc. Asia-Pacific Microw. Conf., Yokohama, Japan, Dec. 2010, pp. 670-673.
[29] P. Kapitanova, D. Kholodnyak, S. Humbla, R. Perrone, J. Mueller, M. A. Hein, and I.
B. Vendik, “Multi-band and tunable multi-band microwave resonators and filters based on cascaded left/right-handed transmission line sections,” in IEEE Eurocon, Saint-Petersburg, Russia, May 2009, pp. 39-45.
[30] Y. C. Li, H. Wong, and Q. Xue, “Dual-mode dual-band bandpass filter based on a stub-loaded patch resonator,” IEEE Microw. Wireless Compon. Lett., vol. 21, no. 10, pp. 525-527, Oct. 2011.
[31] M. Doan and W. Che, “Dual-band bandpass filter using quarter-wavelength resonator with controllable bandwidths and good selectivity,” in International Conference on Advanced Technologies for Communication, Danang, Vietnam, Aug. 2011, pp.
199-202.
[32] P. H. Deng, H. H. Tung, “Design of microstrip dual-passband filter based on branch-line resonators,” IEEE Microw. Wireless Compon. Lett., vol. 21, no. 4, pp.
200-202, Apr. 2011.
[33] C. W. Tang and P. H. Wu, “Design of a planar dual-band bandpass filter,” IEEE Microw. Wireless Compon. Lett., vol. 21, no. 7, pp. 362-364, July 2011.
[34] Z. Zhang, Y. C. Jiao, X. M. Wang, and S. F. Cao, “Design of a compact dual-band bandpass filter using opposite hook-shaped resonator,” IEEE Microw. Wireless Compon. Lett., vol. 21, no. 7, pp. 359-361, July 2011.
[35] K. S. K. Yeo and M. J. Lancaster, “8 pole high temperature superconductor microstrip dual band bandpass filter design,” in IEEE MTT-S Int. Microw. Symp. Dig., Baltimore, June 2011.
[36] X. Liu, L. P. B. Katehi, and D. Peroulis, “Novel dual-band microwave filter using dual-capacitively-loaded cavity resonators,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 11, pp. 610-612, Nov. 2010.
[37] Y. Sung, “Dual-mode dual-band filter with band notch structures,” IEEE Microw.
Wireless Compon. Lett., vol. 20, no. 2, pp. 73-75, Feb. 2010.
[38] H. W. Liu, L. Shen, Z. C. Zhang, J. S. Lim, D. Ahn, “Dual-mode dual-band bandpass filter using defected ground waveguide” Electron. Lett., vol. 46, no. 13, pp. 895-397, Jun. 2010.
130
[39] G. L. Dai, Y. X. Guo, and M. Y. Xia, “Dual-band bandpass filter using parallel short-ended feed scheme,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 6, pp.
325-327, June 2010.
[40] C. W. Tang, Y. K. Hsu, and J. W. Wu, “Design of wide dual-passband microstrip bandpass filters with comb-loaded resonators,” in IEEE MTT-S Int. Microw. Symp.
Dig., Anaheim, California, May 2010, pp. 1700–1703.
[41] X. Luo, H. Qian, J. G. Ma, K. Ma, and K. S. Yeo, “Compact dual-band bandpass filters using novel embedded spiral resonator (ESR),” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 8, pp. 435-437, June 2010.
[42] X. Guan, S. Jiang, L. Shen, H. Liu, G. Li, and D. Xu, “A microstrip dual-band bandpass filter based on a novel admittance inverter,” in International Conference on Microwave and Millimeter Wave Technology, Chengdu, China, May 2010, pp.
577–580.
[43] Y. H. Cho, H. I. Baek, H. S. Lee, and S. W. Yun, “A dual-band combline bandpass filter loaded by lumped series resonators,” IEEE Microw. Wireless Compon. Lett., vol.
19, no. 10, pp. 626-628, Oct. 2009.
[44] M. J. Almalkawi and W. M. Fathelbab, “Novel implementations of dual- and triple-Band filters on double-sided substrates,” in IEEE Radio and Wireless Symposium, San Diego, CA, Jan. 2009, pp. 79-82.
[45] F. Huang, “Dual-band superconducting spiral filters including narrow bandstop notches,” IEEE Trans. Microw. Theory Tech., vol. 57, no. 5, pp. 1188–1195, May 2009.
[46] M. Memarian and R. R. Mansour, “Dual-band half-cut dielectric resonator filters,” in Proc. 39th Eur. Microw. Conf., Rome, Italy, Sep. 2009, pp. 555-558.
[47] M. A. S. Soriano, E. Bronchalo, and G. T. Penalva, “Dual band bandpass filters based on strong coupling directional couplers,” in Proc. 39th Eur. Microw. Conf., Rome, Italy, Sep. 2009, pp. 1401-1404.
[48] C. W. Tang, W. T. Liu, M. G. Chen, and Y. C. Lin, “Design of dual-band bandpass filters with short-end coupled lines,” in Proc. 39th Eur. Microw. Conf., Rome, Italy, Sep. 2009, pp. 1385-1388.
[49] C. W. Hsue, J. W. Hsu, C. H. Lu, and S. T. Peng, “Design and implementation of microwave multi-band multi-level filters using equal-length transmission lines and Yule–Walker scheme,” IET Microw. Antenna. P., vol. 3, no. 5, pp. 826–833, Aug.
2009.
[50] Z. H. Chang, M. Chen, W. Wen, “A novel dual-band bandpass filter based on DBR,”
in Proc. Asia-Pacific Microw. Conf., Singapore, Dec. 2009, pp. 1383-1386.
[51] H. Wang and Q. X. Chu, “A Compact dual-band filter with adjustable transmission zeros,” in Proc. 39th Eur. Microw. Conf., Rome, Italy, Sep. 2009, pp. 117-120.
[52] P. H. Deng and J. H. Jheng, “A switched reconfigurable high-isolation dual-band
131
bandpass filter,” IEEE Microw. Wireless Compon. Lett., vol. 21, no. 2, pp. 71-73, Feb.
2011.
[53] C. H. Kim and K. Chang, “Independently controllable dual-band bandpass filters using asymmetric stepped-impedance resonators,” accepted by IEEE Trans. Microw.
Theory Tech., Oct. 2011.
[54] G. Chaudhary, H. Choi, Y. Jeong, J. Lim, D. Kim, and J. C. Kim, “Design of dual-band bandpass filter using DGS with controllable second passband,” IEEE Microw. Wireless Compon. Lett., vol. 21, no. 11, pp. 589-591, Nov. 2011.
[55] W. H. Tu, “Design of switchable dual-band bandpass filters with four states,” IET Microw. Antenna. P., vol. 4, no. 12, pp. 2234–2239, Dec. 2010.
[56] A. I. Abunjaileh and I. C. Hunter, “Combline filter with tunable bandwidth and centre frequency,” in IEEE MTT-S Int. Microw. Symp. Dig., Anaheim, California, May 2010, pp. 1476–1479.
[57] E. E. Djpoumessi, M Chaker, and K. Wu, “Tunable dual-band filters based on capacitiveloaded stepped-impedance resonators,” IET Microw. Antenna. P., vol. 3, no.
1, pp. 117-124, Feb. 2009.
[58] D. Girbau, A. Kazaro, A. Perez, E. Martinez, L. Pradell, and R. Villarino, “Tunable dual-band filters based on capacitive-loaded stepped-impedance resonators,” in Proc.
39th Eur. Microw. Conf., Rome, Italy, Sep. 2009, pp. 113-116.
[59] G. S. Huang and C. H. Chen, “Dual-band balun bandpass filter with hybrid structure,”
IEEE Microw. Wireless Compon. Lett., vol. 21, no. 7, pp. 356-358, Nov. 2011.
[60] J. H. Chang, Y. S. Lin, C. H. Lee, and C. G. Hsu, “Balanced dual-band BPF design using ring resonators,” in IEEE International Workshop on Electromagnetics, App;ications and Student Innovatopn, Taipei, Taiwan, Aug. 2011, pp. 94-98.
[61] J. E. Lim, M. H. Nam, H. O. Choi, J. H. Lee, “Two-port balanced dual-band bandpass filter based on stepped impedance resonators,” in Proc. Asia-Pacific Microw. Conf., Yokohama, Japan, Dec. 2010, pp. 1114-1117.
[62] J. Shi and Q. Xue, “Novel balanced dual-band bandpass filter using coupled stepped-impedance resonators,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 1, pp. 19-21, Nov. 2010.
[63] J. Shi and Q. Xue, “Dual-band and wide-stopband single-band balanced bandpass filters with high selectivity and common-mode suppression,” IEEE Trans. Microw.
Theory Tech., vol. 58, no. 8, pp. 2204–2212, Aug. 2010.
[64] C. H. Lee, C. G. Hsu, and C. C. Hsu, “Balanced dual-band BPF with stub-loaded SIRs for common-mode suppression,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 2, pp. 70-72, Nov. 2010.
[65] J. Shi and Q. Xue, “Balanced bandpass filters using center-loaded half-wavelength resonators,” IEEE Trans. Microw. Theory Tech., vol. 58, no. 4, pp. 970–977, Apr.
2010.
132
[66] S. Oshima, K. Wada, R. Murata, and Y. Shimakata, “Multilayer Dual-Band Bandpass Filter in Low-Temperature Co-Fired Ceramic Substrate for Ultra-Wideband Applications,” IEEE Trans. Microw. Theory Tech., vol. 58, no. 3, pp. 614–623, Mar.
2010.
[67] R. G. Garcia, M. S. Renedo, B. Jarry, J. Lintignat, and B. Barelaud, “Microwave multi-path dual-passband filters for wide-band applications,” in Proc. 39th Eur.
Microw. Conf., Rome, Italy, Sep. 2009, pp. 109-112.
[68] Z. C. Hao and J. S. Hong, “Dual-band UWB filter using multilayer liquid crystal polymer technology,” Electron. Lett., vol. 46, no. 3, pp. 265-266, Feb. 2010.
[69] D. Yuandan and T. Itoh, “Miniaturized dual-band substrate integrated waveguide filters using complementary split-ring resonators,” in IEEE MTT-S Int. Microw. Symp.
Dig., Baltimore, June 2011.
[70] V. Sekar and K. Entesari, “A novel compact dual-band half-mode substrate integrated waveguide bandpass filter,” in IEEE MTT-S Int. Microw. Symp. Dig., Baltimore, June 2011.
[71] J. Chen, B. Wu, L. W. Jiang, C. H. Liang, “Design of dual-band substrate integrated waveguide filter using frequency transformation method,” in International Conference on Microwave and Millimeter Wave Technology, Chengdu, China, May 2010, pp. 1286–1289.
[72] B. J. Chen, T. M. Shen, and R. B. Wu, “Dual-band vertically stacked laminated waveguide filter design in LTCC technology,” IEEE Trans. Microw. Theory Tech., vol. 57, no. 6, pp. 1554–1562, June 2009.
[73] K. W. Qian and X. H. Tang, “Compact dual-band semi-lumped bandpass filter with LTCC technology,” Electron. Lett., vol. 47, no. 13, pp. 755-757, Jun. 2011.
[74] W. Shen, W. Y. Yin, and X. W. Sun, “Miniaturized dual-band substrate integrated waveguide filter with controllable bandwidths,” IEEE Microw. Wireless Compon.
Lett., vol. 21, no. 8, pp. 418-420, Aug. 2011.
[75] S. K. Hashemi, “Dual-band bandpass filters based on multilayer ring resonators,” in Mediterranean Microwave Symposium, Yasmine Hammamet, Tunisia, Sep. 2011, pp.
34-37.
[76] V. Turgaliev, D. Kholodnyak, I. Vendik, D. Stopel, S. Humbla, J. Muller, and M. A.
Hein, “LTCC highly loaded cavities for the design of single- and dual-band low-loss miniature filters,” in Proc. 40th Eur. Microw. Conf., Paris, France, Sep. 2010, pp.
180-183.
[77] Y. C. Chiou, C. Y. Wu, and J. T. Kuo, ”New miniaturized dual-mode dual-band ring resonator bandpass filter with microwave C-sections,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 2, pp. 67-69, Feb., 2010. [原本的34]
[78] S. Luo, L. Zhu, and S. Sun, “A dual-band ring-resonator bandpass filter based on two pairs of degenerate modes,” IEEE Trans. Microw. Theory Tech., vol. 58, no. 12, pp.
133
3427–3432, Dec. 2010.
[79] B. Choi, W. Lee, H. Kim, and H. Choi, “A dual-band bandpass filter using a dual-mode ring resonator with two short-circuited stubs,” in Mediterranean Microwave Symposium, Guzelyurt, Northern Cyprus, Aug. 2010, pp. 152-155.
[80] S. Sun, “A dual-band bandpass filter using a single dual-mode ring resonator,” IEEE Microw. Wireless Compon. Lett., vol. 21, no. 6, pp. 298-300, June 2011.
[81] J. T. Kuo and T. W. Lin, “Dual-mode dual-band ring resonator bandpass filter with transmission zeros,” in Proc. Asia-Pacific Microw. Conf., Yokohama, Japan, Dec.
2010, pp. 1865-1870.
[82] M. S. Renedo and R. G. Garcia, “Multi-coupled-resonator dual-band bandpass microstrip filters with NRN,” in IEEE MTT-S Int. Microw. Symp. Dig., Baltimore, June 2011.
[83] S. C. Lin, “Microstrip dual/quad-band filters with coupled lines and quasi-lumped impedance inverters based on parallel-path transmission,” IEEE Trans. Microw.
Theory Tech., vol. 59, no. 8, pp. 1937–1946, Aug. 2011.
[84] E. Corrales, O. Menendez, P. de Paco, M. Ramirez, and J. Verdu, “Microstrip dual-band bandpass filter based on the cul-de-sac topology,” in Proc. 40th Eur.
Microw. Conf., Paris, France, Sep. 2010, pp. 549-552.
[85] M. M. Fahmi, J. A. Ruiz-Cruz, R. R. Mansour, and K. A. Zaki, “Compact wide-band ridge waveguide dual-band filters,” in IEEE MTT-S Int. Microw. Symp. Dig., Anaheim, California, May 2010, pp. 888–891.
[86] O. Glubokov and D. Budimir, “Compact E-plane doublet structures for modular filter design,” in Proc. 40th Eur. Microw. Conf., Paris, France, Sep. 2010, pp. 1253-1256.
[87] D. C. Rebenaque, M. M. Mendoza, J. P. Garcia, J. S. G. Diaz, and A. A. Melcon,
“Novel implementations for microstrip resonator filters in transversal topology,” in Proc. 39th Eur. Microw. Conf., Rome, Italy, Sep. 2009, pp. 775-778.
[88] M. S. Renedo and R. G. Garcia, “Microwave dual-band bandpass planar filter using double-coupled resonating feeding sections,” in Proc. 39th Eur. Microw. Conf., Rome, Italy, Sep. 2009, pp. 101-104.
[89] M. Zhou, X. Tang, and F. Xiao, “Compact dual band transversal bandpass filter with multiple transmission zeros and controllable bandwidths,” IEEE Microw. Wireless Compon. Lett., vol. 19, no. 6, pp. 347-349, June 2009.
[90] R. J. Cameron, “General coupling matrix synthesis methods for Chebyshev filtering functions,” IEEE Trans. Microw. Theory Tech., vol. 47, no. 4, pp. 433–442, Apr.
1999.
[91] R. J. Cameron, A. R. Harish, and C. J. Radcliffe, “Synthesis of advanced microwave filters without diagonal cross-couplings,” IEEE Trans. Microw. Theory Tech., vol. 50, no. 12, pp. 2862–2872, Dec. 2002.
[92] R. J. Cameron, “Advanced coupling matrix synthesis techniques for microwave
134
filters,” IEEE Trans. Microw. Theory Tech., vol. 51, no. 1, pp. 1–10, Jan. 2003.
[93] R. J. Cameron, C. M.Kudsia, and R. R. Mansour, Microwave Filters for Communication Systems: Fundamentals, Design, and Applications. Hoboken, NJ:
Wiley, 2007.
[94] P. Kozakowski, A. Lamecki, P. Sypek, and M. Mrozowski, “Eigenvalue approach to synthesis of prototype filters with source/load coupling,” IEEE Microw.Wireless Compon. Lett., vol. 15, no. 2, pp. 98–100, Feb. 2005.
[95] S. Amari, “Synthesis of cross-coupled resonator filters using an analytical gradient-based optimization technique,” IEEE Trans. Microw. Theory Tech., vol. 48, no. 9, pp. 1559–1564, Sep. 2000.
[96] A. G. Lamperez, “Analytical synthesis algorithm of dual-band filters with asymmetric pass bands and generalized topology,” in IEEE MTT-S Int. Microw. Symp. Dig., Honolulu, HI, Jun. 2007, pp. 909–912.
[97] G. Macchiarella and S. Tamiazzo, “Design techniques for dual-passband filters,”
IEEE Trans. Microw. Theory Tech., vol. 53, no. 11, pp. 3265–3271, Nov. 2005.
[98] R. J. Cameron, M. Yu, and Y.Wang, “Direct-coupled microwave filters with single and dual stopbands,” IEEE Trans. Microw. Theory Tech., vol. 53, no. 11, pp.
3288–3297, Nov. 2005.
[99] S. Sun and L. Zhu, “Coupling dispersion of parallel-coupled microstrip lines for dual-band filters with controllable fractional pass bandwidths,” in IEEE MTT-S Int.
Microw. Symp. Dig., Long Beach, CA, Jun. 2005, pp. 2195–2198.
[100] P. Lenoir, S. Bila, F. Seyfert, D. Baillargeat, and S. Verdeyme, “Synthesis and design of asymmetrical dual-band bandpass filters based on equivalent network simplification,” IEEE Trans. Microw. Theory Tech., vol. 54, no. 7, pp. 3090–3097, Jul.
2006.
[101] M. S. Wu, Y. Z. Chueh, J. C. Yeh, and S. G. Mao, “Synthesis of triple-band and quad-band bandpass filters using lumped-element coplanar waveguide resonators,”
Prog. Electromagn. Res. B, vol. 13, pp. 433–451, Jul. 2009.
[102] Y. Zhang, K. A. Zaki, J. A. Ruiz-Cruz, and A. E. Atia, “Analytical synthesis of generalized multi-band microwave filters,” in IEEE MTT-S Int. Microw. Symp. Dig., Honolulu, HI, 2007, pp. 1273–1276.
[103] M. Mokhtaari, J. Bornemann, K. Rambabu, and S. Amari, “Coupling matrix design of dual and triple passband filters,” IEEE Trans. Microw. Theory Tech., vol. 54, no. 11, pp. 3940–3946, Nov. 2006.
[104] V. Lunot, F. Seyfert, S. Bila, and A. Nasser, “Certified computation of optimal multiband filtering functions,” IEEE Trans. Microw. Theory Tech., vol. 56, no. 1, pp.
105–112, Jan. 2008.
[105] G. Macchiarella and S. Tamiazzo, “Dual-band filters for base station multi-band combiners,” in IEEE MTT-S Int. Microw. Symp. Dig., Honolulu, HI, 2007, pp.
135
1289–1292.
[106] G. Macchiarella, “Accurate synthesis of inline prototype filters using cascaded triplet and quadruplet sections,” IEEE Trans. Microw. Theory Tech., vol. 50, no. 7, pp.
1779-1783, July 2002.
[107] X. W. Dai, C. H. Liang, G. Li, and Z. X. Chen, “Novel dual-mode dual-band bandpass filter using microstrip meander-loop resonators,” J. of Electromagn. Waves and Appl., vol. 22, pp. 573-580, 2008.
[108] X. Y. Zhang, J. Shi, J. X. Chen, and Q. Xue, “Dual-band bandpass filter design using a novel feed scheme,” IEEE Microw. Wireless Compon. Lett., vol. 19, no. 6, pp.
350-352, Nov. 2005.
[109] S. Amari and M. Bekheit ”A new class of dual-mode dual-band waveguide filters,” IEEE Trans. Microw. Theory Tech., vol. 56, no. 8, pp. 1938-1944, Aug., 2008.
[110] X. Y. Zhang and Q. Xue, ”Novel dual-mode dual-band filters using coplanar-waveguide-fed ring resonators,” IEEE Trans. Microw. Theory Tech., vol. 55, no. 10, pp. 2183-2190, Oct., 2007.
[111] J. X. Chen, T. Y. Yum, J. L. Li, and Q. Xue, ”Dual-mode dual-bandbandpass filter using stacked-loop structure,” IEEE Microw. Wireless Compon. Lett., vol. 16, no.
9, pp. 502-504, Sep., 2006.
[112] C. Karpuz and A. Görür, ”Dual-mode dual-band microstrip filters,” in Proc. 39th Eur. Microw. Conf., Rome, Italy, Sep. 2009, pp. 105-108.
[113] C. Karpuz, A. Görür, E. Güntürkün, and A. Görür, ”Asymmetric response dual-mode dual-band bandstop filters having simple and understandable topology,” in Proc. Asia-Pacific Microw. Conf., Singapore, 2009, pp. 925-928.
[114] K. Kim, H. Pyo, J. An, and Y. Lim, ”Dual-band filter using half wavelength resonators and dual-mode resonator,” in Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology International Conference(ECTI-CON 2009), Pattaya, Chonburi, 2009, pp. 928-931.
[115] P. Mondal and M. K. Mandal, ”Design of dual-band bandpass filters using stub-loaded open-loop resonators,” IEEE Trans. Microw. Theory Tech., vol. 56, no. 1,
[115] P. Mondal and M. K. Mandal, ”Design of dual-band bandpass filters using stub-loaded open-loop resonators,” IEEE Trans. Microw. Theory Tech., vol. 56, no. 1,