Hung Chun-Ming, Jheng Ci-Fang, Lee Keh-Yi, Hsu Chung-I G, Ho Min-Hua
Universal Microwave Technology Inc., Keelung 206, Taiwan.
Department of Electronic Engineering, National Changhua University of Education, Changhua 500, Taiwan.
Sensors (Basel). 2025 May 5;25(9):2921. doi: 10.3390/s25092921.
This paper presents the design of a dual-band filter and a diplexer using an extremely miniaturized substrate-integrated coaxial cavity (SICC) structure. The presented dual-band filter can function as a front-end circuit block connected to 5G antennae, enabling dual-passband operation for 5G applications. The diplexer is designed for use in 5G communication systems, positioned after the 5G antennae to facilitate the switching of transmitting (Tx) and receiving (Rx) signals between the Tx and Rx terminals. The main contribution of this work is the development of a highly miniaturized substrate-integrated coaxial cavity (SICC) to design a dual-band filter (DBF) and a diplexer. The circuit area of the proposed dual-frequency SICC is a mere 2.1% of its conventional substrate-integrated waveguide (SIW) cavity counterpart when operating at the same frequency. A dual-band filter and a diplexer are realized using two and three highly miniaturized SICC resonators, respectively. The dual-band filter is designed to have a transmission zero on each passband side to enhance signal selectively. At most in-band frequencies, the isolation between the diplexer's channel bands exceeds 20 dB. A sample dual-band filter and diplexer have been fabricated for experimental validation, demonstrating excellent agreement between the measured and simulated data. To the best of the authors' knowledge, the designed dual-band filter and diplexer achieve the highest circuit area efficiency within the categories of dual-band SIW cavity filters and diplexers.
本文介绍了一种采用超小型化基片集成同轴腔（SICC）结构的双频滤波器和双工器的设计。所提出的双频滤波器可作为连接到5G天线的前端电路模块，实现5G应用的双通带操作。该双工器设计用于5G通信系统，位于5G天线之后，便于在发射（Tx）和接收（Rx）终端之间切换发射（Tx）和接收（Rx）信号。这项工作的主要贡献是开发了一种高度小型化的基片集成同轴腔（SICC），用于设计双频滤波器（DBF）和双工器。在所提出的双频SICC在相同频率下工作时，其电路面积仅为传统基片集成波导（SIW）腔的2.1%。分别使用两个和三个高度小型化的SICC谐振器实现了双频滤波器和双工器。双频滤波器设计为在每个通带侧具有传输零点，以提高信号选择性。在大多数带内频率下，双工器通道带之间的隔离度超过20dB。制作了一个样本双频滤波器和双工器进行实验验证，测量数据与模拟数据显示出极好的一致性。据作者所知，所设计的双频滤波器和双工器在双频SIW腔滤波器和双工器类别中实现了最高的电路面积效率。
