TY - JOUR

T1 - Analysis of the Metal Plate Coupled Resonator With Its Compact In-Line Filter Design Applications

AU - Rao, Jiayu

AU - Sun, Cong

AU - Lu, Jiajin

AU - Gao, Qian

AU - Zhou, Bowei

AU - Zhao, Hualin

AU - Liu, Hai

AU - Zhang, Sheng

AU - Vaitukaitis, Povilas

AU - Wang, Lei

AU - Hong, Jiasheng

PY - 2024/9/30

Y1 - 2024/9/30

N2 - This article introduces and analyzes the modified metal plate coupled resonator (MPCR), which can be designed to exhibit distinctive nondegenerate dual-mode characteristics, i.e., having different resonating frequencies and presenting quasi-orthogonal features (e.g., no coupling). By employing different feeding methods, the MPCR can function as either a single-mode or dual-mode resonator, both of which are suited for the design of in-line filters with controllable transmission zeros (TZs). For the single-mode operation, new mixed-coupling-based in-line filters can be designed to yield noteworthy advancements compared to prior research, as these filters achieve arbitrary placement of TZs without necessitating any additional structures. For the dual-mode operation, more compact in-line filters based on transverse coupling topology for achieving quasi-elliptic function response can be designed. In general, all filters developed in this work provide the advantages of adjustable TZs and simple physical configurations. For the rapid prototyping and the experimental demonstration, certain C-band filters were designed and manufactured using 3-D metal printing technology. Meanwhile, for the first time, the necessity of introducing post-magnetic tuning is validated and then applied to the mixed-coupled filters. As a result, all testing results showed consistency with the simulated ones.

AB - This article introduces and analyzes the modified metal plate coupled resonator (MPCR), which can be designed to exhibit distinctive nondegenerate dual-mode characteristics, i.e., having different resonating frequencies and presenting quasi-orthogonal features (e.g., no coupling). By employing different feeding methods, the MPCR can function as either a single-mode or dual-mode resonator, both of which are suited for the design of in-line filters with controllable transmission zeros (TZs). For the single-mode operation, new mixed-coupling-based in-line filters can be designed to yield noteworthy advancements compared to prior research, as these filters achieve arbitrary placement of TZs without necessitating any additional structures. For the dual-mode operation, more compact in-line filters based on transverse coupling topology for achieving quasi-elliptic function response can be designed. In general, all filters developed in this work provide the advantages of adjustable TZs and simple physical configurations. For the rapid prototyping and the experimental demonstration, certain C-band filters were designed and manufactured using 3-D metal printing technology. Meanwhile, for the first time, the necessity of introducing post-magnetic tuning is validated and then applied to the mixed-coupled filters. As a result, all testing results showed consistency with the simulated ones.

KW - 3-D metal printing

KW - Band-pass filters

KW - Bandpass coaxial filter

KW - Couplings

KW - Filtering theory

KW - Metals

KW - Microwave filters

KW - Resonant frequency

KW - Resonator filters

KW - in-line topology filters

KW - transmission zeros (TZs)

U2 - 10.1109/TMTT.2024.3366759

DO - 10.1109/TMTT.2024.3366759

M3 - Journal article

VL - 72

SP - 5455

EP - 5466

JO - IEEE Transactions on Microwave Theory and Techniques

JF - IEEE Transactions on Microwave Theory and Techniques

SN - 0018-9480

IS - 9

ER -