[案例]玻璃基毫米波高抑制滤波器

A high-selective millimeter-wave bandpass filter (BPF) utilizing folded-line coupling resonator (FLCR) is presented. This BPF consists of four unitized FLCRs, which are realized by redistribution layer (RDL) on a glass interposer. There are electric and magnetic couplings among the resonators. By parameterizing the size and couplings of the FLCRs, the passband and four TZs can be readily controlled. To illustrate the operational principle, an equivalent circuit of the FLCRs is proposed and discussed. To validate the design, the BPF prototype working at 20.7 GHz is designed and fabricated. The measured results show that the designed BPF can achieve a 3-dB fractional bandwidth of 17.3 %. Moreover, the designed BPF exhibits a roll-off of 18.68 dB/GHz in the low sideband and a roll-off of 10.76 dB/GHz in the high sideband, thereby producing sharp-rejection filtering. In addition, it can achieve more than 36 dB of suppression from 0 to 14.6 GHz and more than 30 dB from 24.5 to 38.5 GHz. The fabricated BPF has a compact size of 1.73 mm × 1.1 mm (0.242 λg × 0.154 λg).


该成果使用了法动科技射频EDA工具-UltraEM！

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