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应用LTCC多层耦合带状线谐振器和交叉耦合传输零点原理,在改进的三维梳状带通滤波器结构中引入交叉耦合,增强非相邻谐振级间的交叉耦合;在2、4谐振级间引入Z字形导体层,通过调节Z字形控制传输零点位置;同时适当调节加载电容大小,有效减小了滤波器体积,实现了高次谐波抑制、边带陡峭和通带内线性相位。采用低温共烧陶瓷(LTCC)技术设计制作了中心频率为3GHz,通带为200MHz的微型带通滤波器。实验和仿真结果表明,该滤波器的中心频率插入损耗小于2.6dB,阻带抑制高于40dB,边带陡峭,尺寸仅为4.8mm×4.2mm×1.5mm。成品率高达85%。
By using LTCC multi-layer coupled stripline resonator and cross-coupled transmission zero principle, cross-coupling is introduced into the improved three-dimensional comb band-pass filter structure to enhance the cross-coupling between non-adjacent resonant levels. At the 2,4 resonance level The zigzag conductor layer is introduced between the zig-zag conductors to control the transmission zero position by adjusting the zigzag shape. At the same time, the size of the loading capacitor is properly adjusted to effectively reduce the filter volume and achieve high harmonic suppression, steep sidebands and linear phase in the passband. A miniature band-pass filter with a center frequency of 3 GHz and a passband of 200 MHz was designed and manufactured by using low-temperature co-fired ceramic (LTCC) technology. Experimental and simulation results show that the center frequency insertion loss of the filter is less than 2.6dB, the stopband rejection is higher than 40dB, the sideband is steep, and the size is only 4.8mm × 4.2mm × 1.5mm. Yield as high as 85%.