橋式串接高頻電容值量測電路

A Bridge Type Serial-Connected High Frequency Capacitance Measurement Circuit

王姵琪(Pei-Chi Wang) ； 曾振東(Jan-Dong Tseng)

《技術學刊》 25卷4期 (2010/12) Pp. 261-267

https://doi.org/10.29507/JT.201012.0002

摘要

本文提出一種傳輸線的橋式結構，可應用在表面黏著元件電容值的量測。電路結構因具有對稱性，電路特性以奇偶模分析方式進行以求得。文中並分析不同阻抗及電氣長度之傳輸線和負載電容值，對散射參數S11、S21的影響。本電路可應用在高頻的電容值量測。電路特性並以電磁模擬軟體Microwave Office V2.66及IE3D進行模擬驗證且使用MATLAB驗證推導公式之正確性，實際電路以FR-4雙面板製作。由模擬與實際電路量測結果顯示，本電容值測定器之模擬與量測結果均具有良好的一致性。

關鍵字

傳輸線 ； 橋式 ； 電容量測

並列摘要

A novel transmission line bridge planar type circuit for surface mount device capacitance measurement in microwave frequency bands is proposed. The circuit possesses a symmetrical structure and can be used for even-odd mode analysis to obtain two-port scattering parameters in terms of physical parameters. The influences of various transmission line impedance values, electrical lengths and load capacitances on the scattering parameters are widely investigated. The analysed results are helpful for actual circuit design. One prototype circuit has been designed at 1 GHz, simulated by Microwave Office V2.66 and IE3D microwave simulators, and fabricated on FR-4 substrate. The simulated and experimental results show good agreement in the frequency of interest.

並列關鍵字

transmission line ； bridge type ； capacitance measurement