| 王友保,鲍岩,张天豪,马君鑫.恒定带宽的高选择性平衡可调带通滤波器[J].电子测量与仪器学报,2025,39(4):26-33 |
| 恒定带宽的高选择性平衡可调带通滤波器 |
| Constant bandwidth highly selective balanced tunable bandpass filter |
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| DOI： |
| 中文关键词: 可调滤波器 恒定带宽 高频率选择性 传输零点 |
| 英文关键词:tunable bandpass filter constant bandwidth high-frequency selective transmission zero |
| 基金项目:国家自然科学基金（62301262）项目资助 |
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| Author | Institution |
| Wang Youbao | School of Electronics and Information Engineer, Nanjing University of Information Science & Technology, Nanjing 210044,China |
| Bao Yan | School of Electronics and Information Engineer, Nanjing University of Information Science & Technology, Nanjing 210044,China |
| Zhang Tianhao | School of Electronics and Information Engineer, Nanjing University of Information Science & Technology, Nanjing 210044,China |
| Ma Junxin | School of Electronics and Information Engineer, Nanjing University of Information Science & Technology, Nanjing 210044,China |
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| 摘要点击次数: 69 |
| 全文下载次数: 106 |
| 中文摘要: |
| 针对传统可调滤波器在中心频率调谐过程中难以维持恒定带宽的技术难题，设计了一款新的中心频率可调、带宽恒定、高频率选择特性的平衡带通滤波器。该滤波器基于谐振器之间存在的电磁耦合，采用4个可调谐振器来构成3个耦合结构，并在馈电电路上引入源与负载的耦合，以便在通带两侧各产生2个传输零点；仅使用同一个直流偏置电压加载于变容二极管，实现了滤波器的中心频率的可调；采用奇偶模分析理论，以及利用耦合系数、外部品质因数分别随谐振频率变化的目标曲线，实现了滤波器的带宽恒定、插损小、带外抑制好的设计目标。滤波器的仿真和实测性能基本一致，其可调中心频率范围为788~978 MHz，而在此可调中心频率范围内维持3 dB带宽为(43±1.2 MHz)不变。与现有技术相比，该设计在保持恒定带宽的同时，通过谐振器结构的优化折叠，有效减小了器件尺寸，为高性能可调滤波器的实现提供了一种可行的解决方案。 |
| 英文摘要: |
| To address the technical challenge of maintaining a constant bandwidth during the center frequency tuning process in traditional tunable filters, a new balanced bandpass filter with adjustable center frequency, constant bandwidth and high frequency selection performance is designed. Based on the electromagnetic coupling between the resonators, three coupling structures are formed through four tunable oscillators, and the coupling between the source and the load on the feed circuit is introduced, so that two transmission zeros are generated on each side of the filter passband. Using only the same DC bias voltage to load on the transformer diode, the center frequency of the filter is adjustable. Utilizing odd-even mode analysis theory and the target curve of coupling coefficient and external quality factor varying with the resonance frequency, the design objectives of constant bandwidth, low insertion loss and good out-of-band suppression are achieved. The simulated and measured features of the filter are in good agreement, with an adjustable central frequency range from 788 to 978 MHz, while sustaining a 3 dB bandwidth of (43±1.2 MHz) throughout this range. Compared to existing technologies, this design effectively reduces device size through optimized folding of resonator structures while maintaining constant bandwidth, providing a feasible solution for the realization of high-performance tunable filters. |
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