FDTD를 이용한 TWPD의 마이크로파 특성 분석

초록

In this paper, we present microwave characteristics of traveling-wave photodetectors (TWPD) using the finite-difference time-domain method (FDTD). Current and voltage in the time domain are calculated by the FDTD. Also, characteristic impedance and propagation constant in frequency domain are obtained from the time-domain data. As the thickness of i-layer gets thicker and the waveguide width gets narrower, TWPD's show less microwave loss and higher velocity. The 50 Ω impedance matching design is achieved for 2.4 ㎛ waveguide width and 1.2 ㎛ thickness of i-layer at 100 GHz.

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