基于CRLHTL的高功分比不等分功分器

Unequal power divider with high dividing ratio based on CRLH TL

利用ABCD矩阵法分析得出:当传统微带线电长度为0°~180°时,低阻抗平衡CRLH TL可替代高阻抗传统微带线。根据分析结果,同时结合不等分Wilkinson功分器的设计原理,用特征阻抗为75?的CRLH TL代替274?的传统λ/4微带线,设计了一款工作于2.4 GHz,功分比为9:1的高功分比不等分功分器。测试结果表明:插入损耗S_(31)和S_(21)在工作频率处的差值为9.35 d B,回波损耗在2.29~2.5 GHz范围内小于–20 d B,隔离度在2~2.6GHz范围内小于–20 d B。

By using the ABCD matrix method, it is concluded that when the conventional microstrip line is between 0-180 degrees, the traditional microstrip lines with high impedance can be replaced by the balance CRLH TL with low impedance. According to the analysis results, and with the design principle of the unequal Wilkinson power divider, a 9：1 unequal power divider operating at 2.4 GHz by using CRLH TL with characteristic impedance of 75 Ω instead of the λ/4 traditional microstrip line with 274 Ω was designed. The test results show that the difference between the insertion loss S31 and the S21 at the operating frequency is 9.35 dB, and the return loss is less than –20 dB in the range of 2.29-2.5 GHz, while the isolation is less than –20 dB in the range of 2-2.6 GHz.