This paper presents a simple procedure to design planar diplexers making use of an energetic coupling approach. The targeted diplexer uses a stepped impedance resonator (SIR) to generate two resonant frequencies at the desired pass bands. The energetic coupling theory is employed to obtain appropriate coupling factors between the SIR and the diplexer outputs. In order to validate the proposed design method two diplexers satisfying the GSM and WLAN application frequencies have been fabricated and characterized. One prototype has been implemented in microstrip technology, while for the fabrication of the other one a low-cost 3D printing multilayer process has been used. In both cases measurements are in good agreement with simulated responses.

本文介绍了一种使用能量耦合方法设计平面双工器的简单程序。目标双工器使用步进阻抗谐振器 (SIR) 在所需的通带生成两个谐振频率。采用能量耦合理论来获得 SIR 和双工器输出之间的适当耦合因子。为了验证所提出的设计方法，已经制造并表征了满足 GSM 和 WLAN 应用频率的两个双工器。一个原型已经在微带技术中实现，而另一个原型的制造则使用了低成本的 3D 打印多层工艺。在这两种情况下，测量结果都与模拟响应非常吻合。