【作者】：Nan Zhang,Xiaolong Wang,Chunxi Bao,Bin Wu,Chun-Ping Chen,Zhewang Ma,Geyu Lu
【题目】：A Novel Synthetization Approach for Multi Coupled Line Section Impedance Transformers in Wideband Applications
【关键词】：Chebyshev response,coupled line section (CLS),transmission line (TL),wideband impedance transformer
【版面信息】：Applied Seiences 2022, vol 12 no 2
摘要:
In this paper, a novel synthetization approach is proposed for filter-integrated wideband
impedance transformers (ITs). The original topology consists of N cascaded coupled line sections
(CLSs) with 2N characteristic impedance parameters. By analyzing these characteristic impedances,
a Chebyshev response can be derived to consume N + 2 design conditions. To optimize the left
N - 2 variable parameters, CLSs were newly substituted by transmission lines (TLs) to consume
the remaining variable parameters and simplify the circuit topology. Therefore, there are totally
2N - N - 2 substituting possibilities. To verify the proposed approach, 25 cases are listed under the
condition of N = 5, and 7 selected cases are compared and discussed in detail. Finally, a 75–50 W IT
with 100% fractional bandwidth and 20 dB bandpass return loss (RL) is designed and fabricated. The
measured results meet the circuit simulation and the EM simulation accurately
