NOVEL HAIRPIN-LINE MICROSTRIP BANDPASS FILTER WITH 2nd & 3rd SPURIOUS PASSBANDS SUPPRESSION

In this paper we present novel wideband quasi fractal geometry for suppression of second and third harmonics in hairpin-line microstrip bandpass filter (HLM-BPF). This new fractal geometry is obtained by modifying Minkowski fractal. HLM-BPFs have two main problems, having narrow passband and spurious bands which are located at the second and third harmonics. The former relates to relatively weak coupling between resonators and the latter relates to the difference between odd and even phase velocities of resonators. By using this novel geometry we could overcome these problems so that the second and third harmonics of fractal filters are suppressed and the bandwidth is increased to 54% of the central frequency. In order to validate the proposed geometry, third-order Chehvshev bandpass filter was designed at 1 GHz with a 25% fractional bandwidth on FR4 substrate. Theoretical and simulated results are presented.
Harmonics suppression quasi fractal geometry wideband microstrip hairpin-line filter
ALI LALBAKHSH MOHAMMAD NASER-MOGHADASI ABBAS ALI LOTFI NEYESTANAK POOIA LALBAKHSH
Department of Engineering, Science and Research Branch Islamic Azad University, Tehran,Iran Department of Engineering,Science and Research Branch Islamic Azad University Tehran, Iran Islamic Azad University,Shahre Rev Branch Tehran,Iran Department of Engineering, Science and Research Branch Islamic Azad University, Tehran, Iran
国际会议
3rd International Conference on Mechanical and Electrical Technology(ICMET2011) (2011第三届机械与电气技术国际会议)
大连
英文
359-363
2011-08-26(万方平台首次上网日期,不代表论文的发表时间)