Performance Analysis of Reconfigurable Bandpass Filters With Continuously Tunable Center Frequency and Bandwidth
Performance Analysis of Reconfigurable Bandpass Filters With Continuously Tunable Center Frequency and Bandwidth
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DOI：
10.1109/tmtt.2017.2742479
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发表时间：
2017-08
影响因子：
4.3
通讯作者：
C. Schuster;A. Wiens;Florian Schmidt;M. Nickel;M. Schüßler;R. Jakoby;H. Maune
中科院分区：
文献类型：
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作者：
C. Schuster;A. Wiens;Florian Schmidt;M. Nickel;M. Schüßler;R. Jakoby;H. Maune
本文对利用半导体变容二极管、市售钛酸锶(BST)薄膜和丝网印刷BST厚膜变容二极管实现可调谐滤光片的三种不同技术进行了比较和性能评价。为了确定最适合应用于低功率接收到高功率发射级的技术，使用相同的可调发夹滤波器设计进行了性能评估。所提出的可调谐滤波器结构的中心频率通过加载滤波器谐振器的变容管来调谐，而带宽则由相邻谐振器之间的耦合变容管来控制。这些滤波器设计的中心频率范围从700 MHz到1 GHz，带宽调谐范围从60 MHz到150 MHz。评估和比较了这些可调谐滤波器的可调性、品质因数、线性度(三阶互调产物)和功率处理能力。总而言之，基于半导体变容二极管的可调发夹滤波器提供了最大的中心频率调谐范围390 MHz，透过率在−1.5和−7分贝之间，而基于薄膜和厚膜变容二极管的滤波器表现出高度的线性，IIP3值在39到60 dBm之间。此外，大信号表征表明，基于BST厚膜变容二极管的滤波器结构具有高达41dBm的最佳功率处理能力。
This paper presents a comparison and performance evaluation of three different technologies for the implementation of tunable filters utilizing semiconductor varactors, commercially available barium strontium titanate (BST) thin film and screen-printed BST thick-film varactors. To identify the most suitable technology for applications in low power receiving up to high-power transmitting stages, the performance evaluation is carried out with the same tunable hairpin filter design. While the center frequency of the proposed tunable filter structure is tuned by varactors loading the filter resonators, the bandwidth is controlled by coupling varactors between adjacent resonators. The filters are designed for a center frequency range from 700 MHz to 1 GHz and for bandwidth tuning from 60 to 150 MHz. The tunable filters are evaluated and compared with regard to their tunability, quality factor, linearity (intermodulation products of third order), and power handling capability. In conclusion, the tunable hairpin filter based on semiconductor varactor diodes offers the largest center frequency tuning range of 390 MHz with a transmission between −1.5 and −7 dB, whereas the BST thin- and thick-film-varactors-based filters exhibit high linearity with an IIP3 between 39 and 60 dBm. Moreover, large signal characterization reveals that the BST thick-film-varactors-based filter structure has the best power handling capability of up to 41dBm.