Compact dual-band bandpass filter with ultra wide stopband using open-loop resonator loaded by T-shape and open stubs

IEICE Electronics Express

Mohsen Hayati¹  Leila Noori¹ 

[1] Electrical and Electronics Engineering Department, Razi University

关键词: dual band;    mixed coupling;    Open stub;    ultra wide stopband;   

DOI  :  10.1587/elex.8.1168

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(10)Cited-By(2)We present the design of a compact dual-band bandpass filter using open-loop resonator, which connected together with mixed coupling, loaded by T- shape stub and open stubs. Open stubs are loaded to achieve high performance and the tapped line feed structure is used in input-output port. By adjusting the tapping position, stubs length and the impedance ratio of T- shape stub, the filter performance can be controlled. The T shape stubs are used to suppress the harmonics above the second band. The insertion losses are 0.2dB and 0.9dB at 2.7 and 5GHz respectively. Above the second pass band minimum attenuation is -20dB from 5.3 to 20GHz, so it can be used for ultra wide stopband applications. The measurement results have shown a good agreement with the simulation.

【 授权许可】

Unknown