A Compact DBR Filter Using Pi-Network and Dual-Line Equivalent Circuit

作者：Su, Tao^*; Wang, Sheng-Jie; Zhang, Yong-Liang; Li, Zhi-Peng; Zhang, Li-Juan

来源：IEEE Microwave and Wireless Components Letters, 2013, 23(7): 350-352.

DOI：10.1109/LMWC.2013.2264660

• Compact
• dual behavior resonator (DBR) filter
• dual-line equivalent circuit
• Pi-network

This letter presents a new design structure for compact Dual Behavior Resonator (DBR) filter using Pi-Network and dual-line equivalent circuits. The proposed Pi-Network replaces the J-inverter in DBR filter, which consists of a high impedance transmission line and parallel capacitances loaded on both sides, where the parallel capacitances can be integrated into neighboring resonators. The dual-line structure is used to replace open-circuited transmission line segment. The relevant equations of the proposed filter are derived. The whole structures have the advantages of better out-of-band rejection and easy fabrication. A 3-order DBR filter is designed and measured. Its size is only 28% of the classical one, and experiment results are in good agreement with simulation results.

• 出版日期2013-7
• 单位西安电子科技大学