Synthesis Methodology Applied to a Tunable Patch Filter With Independent Frequency and Bandwidth Control
Synthesis Methodology Applied to a Tunable Patch Filter With Independent Frequency and Bandwidth Control
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DOI：
10.1109/tmtt.2011.2181533
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发表时间：
2012-01
影响因子：
4.3
通讯作者：
Ariana Lacorte Caniato Serrano;F. Salete Correra;T. Vuong;P. Ferrari
中科院分区：
文献类型：
--
作者：
Ariana Lacorte Caniato Serrano;F. Salete Correra;T. Vuong;P. Ferrari
提出了一种新的可调谐贴片滤波器的合成方法。该方法有助于设计人员通过耦合矩阵对滤波器进行理论分析，该耦合矩阵包括用于调谐滤波器的调谐元件的影响。这种一般的方法占任何调谐参数所需的，并应用于可调谐双模贴片滤波器的设计与独立控制的中心频率和带宽（BW）。带通滤波器采用一个三角形谐振器，两个蚀刻槽分裂基本简并模式，形成滤波器通带。跨槽组装的变容二极管用于独立地改变每个简并基模的频率，由于滤波器的耦合方案的性质，这是可行的。变容二极管模型中使用的模拟，他们的组装，直流偏置配置，和测量结果。理论结果进行了比较，模拟和测量显示出很好的协议，并验证所提出的方法。所制造的滤波器呈现出椭圆响应与20%的中心频率调谐范围约3.2 GHz和分数带宽变化从4%到12%，低插入损耗和高功率处理与1 dB的压缩点高于。
A new methodology for the synthesis of tunable patch filters is presented. The methodology helps the designer to perform a theoretical analysis of the filter through a coupling matrix that includes the effect of the tuning elements used to tune the filter. This general methodology accounts for any tuning parameter desired and was applied to the design of a tunable dual-mode patch filter with independent control of center frequency and bandwidth (BW). The bandpass filter uses a single triangular resonator with two etched slots that split the fundamental degenerate modes and form the filter passband. Varactor diodes assembled across the slots are used to vary the frequency of each degenerate fundamental mode independently, which is feasible due to the nature of the coupling scheme of the filter. The varactor diode model used in simulations, their assembling, the dc bias configuration, and measured results are presented. The theory results are compared to the simulations and to measurements showing a very good agreement and validating the proposed methodology. The fabricated filter presents an elliptic response with 20% of center frequency tuning range around 3.2 GHz and a fractional BW variation from 4% to 12% with low insertion loss and high power handling with a 1-dB compression point higher than .