Pico-second time domain reflectometry response of a microstripline embedded in various liquids
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - Trang 329-332
Tóm tắt
A microstripline having 50 ohms characteristic impedance has been delineated on PCB type FR-4 board material, by using standard three layer dry film lamination and chemical photo-etching technology. The dielectric constant and dissipation factor for FR-4 substrate material is 4.6 and 0.018 at 1 MHz respectively. The fringing fields arising from free end of a microstripline have been employed to observe its free-end-dip liquid response. The microstripline has been vertically dipped in various liquids at different successive lengths. The response due to 40 pico second rise time pulse from free-end-dip of a microstripline in a liquid is observed on the TDR equipment in reflection mode at room temperature. The response waveform obtained is similar to the conventional co-axial transmission line connected to precision SMA cell containing liquid. The data analysis is carried out by standard Fourier transformation techniques. The microstripline of suitable length embedded in a liquid can be used as substitute to the SMA cell to determine the dielectric properties of various liquids.
Từ khóa
#Reflectometry #Microstrip #Liquids #Dielectric materials #Chemical technology #Impedance #Optical films #Lamination #Dielectric constant #Dielectric substratesTài liệu tham khảo
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