NOVEL MICROSTRIP TRIANGULAR RESONATOR BANDPASS FILTER WITH TRANSMISSION ZEROS AND WIDE BANDS USING FRACTAL-SHAPED DEFECTION

摘要: Fractal microwave passive circuits are simple and novel structures that attract much attention recently, however, the fractal technique is dominantly applied in antennas. In this paper, some new characteristics of microstrip equilateral triangular patch resonator with defection analyzed, bandpass filters using presented to implement high performances multi-transmission zeros, wide passband stopband, low insertion loss as well miniaturization. Using patch, multi higher order modes inspired for coupling a wider passband, parasitical harmonics effectively suppressed. A filter about 0.92 GHz (er =9 .8) or 2.7 =2 .2), maximum less than 0.5 dB, zeros at both sides second stopbands more 2 implemented. Compared literatures, sizes reduced greatly enhanced. The proposed have compact structures, small sizes, selectivity so on, all these features requirement wireless communication circuits.