Synthesis Methodology Applied to a Tunable Patch Filter With Independent Frequency and Bandwidth Control

被引:50
作者
Caniato Serrano, Ariana Lacorte [1 ,2 ]
Correra, Fatima Salete [1 ]
Vuong, Tan-Phu [3 ]
Ferrari, Philippe [3 ,4 ,5 ,6 ]
机构
[1] Univ Sao Paulo, Lab Microelect, Polytech Sch, BR-05424970 Sao Paulo, Brazil
[2] Grenoble Inst Technol, Inst Microelect Electromagnetism & Photon Microwa, F-38016 Grenoble, France
[3] Grenoble Inst Technol INPG, Inst Microelect Electromagnetism & Photon Microwa, F-38016 Grenoble, France
[4] Univ Grenoble 1, F-38041 Grenoble, France
[5] Univ Savoy, F-73000 Chambery, France
[6] CNRS, F-75700 Paris, France
关键词
Bandpass filters; dual-mode patch filter; microwave filters; tunable filters; BANDPASS FILTER; RESONATOR;
D O I
10.1109/TMTT.2011.2181533
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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 +14.5 dB.
引用
收藏
页码:484 / 493
页数:10
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