LTCC Multilayered Helical Filters With a Mixed Electric and Magnetic Coupling Structure
LTCC Multilayered Helical Filters With a Mixed Electric and Magnetic Coupling Structure
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DOI：
10.1109/tcpmt.2015.2457679
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发表时间：
2015-08
期刊：
影响因子：
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通讯作者：
Yafen Wu;K. Chin;W. Che;Kuang-ching Chang;W. Feng
中科院分区：
文献类型：
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作者：
Yafen Wu;K. Chin;W. Che;Kuang-ching Chang;W. Feng
本文研制了紧凑的多层螺旋谐振器和具有混合电、磁耦合结构的各种耦合谐振器对。多层结构适合小型化，增强了相互耦合。利用两个螺旋谐振器之间的混合耦合，可以产生一对传输零，从而实现优越的频率选择性。提出了一种等效电路模型来分析tts的产生。平面螺旋结构提供了设计上的灵活性。提出了8对耦合谐振器，用于综合各种滤波器响应。采用低温共烧陶瓷技术制备了实验用二阶螺旋滤波器。该二阶滤波器的测量结果表明，中心频率为0.976 GHz，其中两个TZs分别位于0.8和1.4 GHz。插入损耗小于1.96 dB，回波损耗为25 dB。该过滤器的尺寸仅为5.7 mm × 3.4 mm (0.051 λg × 0.031 λg)，与其他已发表的过滤器相比，尺寸非常紧凑。此外，所提出的耦合对在通过级联多个耦合螺旋对构建具有优越频率选择性的高阶滤波器方面具有潜力。
In this paper, compact multilayered helical resonators and various coupled resonator pairs with a mixed electric and magnetic coupling structure were developed. A multilayer structure is suitable for miniaturization and enhances mutual coupling. A pair of transmission zeros (TZs) can be created using mixed coupling between two coupled helical resonators, achieving superior frequency selectivity. An equivalent circuit model was proposed to analyze the creation of TZs. The planar helical structure provides design flexibility in control of TZs. Eight coupled resonator pairs were proposed for synthesizing various filter responses. An experimental second-order helical filter was fabricated using low-temperature cofired ceramic technology. The measurement results of this second-order filter showed the center frequency to be 0.976 GHz, with two TZs located at 0.8 and 1.4 GHz. The insertion loss was lower than 1.96 dB, and the return loss was 25 dB at f0. The size of this filter was only 5.7 mm × 3.4 mm (0.051 λg × 0.031 λg), which is highly compact compared with filters from other published studies. In addition, the proposed coupled pairs have potential in the construction of high-order filters with superior frequency selectivity by cascading multiple coupled helical pairs.