Zeyu Wang, Chenchen Li, YiQiang Gao, Hao Sun, Minghui Yang, Xiaowei Sun. Optimal Design of Heterojunction AlGaAs/GaAs PIN Diode Millimeter-Wave Switch and Its Imaging Application[J]. Laser & Optoelectronics Progress, 2021, 58(22): 2209001
- Laser & Optoelectronics Progress
- Vol. 58, Issue 22, 2209001 (2021)
Fig. 1. Structure of millimeter wave security inspection imaging system. (a) Core components; (b) transmitting front-end module
Fig. 2. Transmission line models and performance curves of grounded coplanar waveguides and microstrip structures. (a) Three-dimensional simulation structure; (b) comparison of simulation results of S parameters
Fig. 3. Two-port equivalent circuit. (a) Bonding wires; (b) equivalent “T” type network with compensation of high-low impedance line
Fig. 4. Schematic and performance curves of transmission line before and after high-low impedance line compensation. (a) Before compensation; (b) after compensation; (c) comparison of simulation results of S parameters
Fig. 5. Switch chip evaluation board. (a) SP4T switch; (b) SPDT switch
Fig. 6. Simulation and measurement results of S parameters of different chips. (a) SPDT switch chip evaluation board; (b) SP4T switch chip evaluation board
Fig. 7. Layout and performance curves of 8-channel switch subcircuits. (a) Actual assembly photograph; (b) simulation results of S parameters under different channels
Fig. 8. Octave frequency multiplier structure and spectrum simulation curves. (a) Chain block diagram; (b) harmonic simulation results
Fig. 9. Schematic and performance curves of wideband bandpass filter. (a) 3D models and; (b) Simulation results of S parameters
Fig. 10. Test framework for transmitting front-end
Fig. 11. Measured results of transmitting front-end module. (a) Output power of each channel and isolation between channels; (b) harmonic rejection
Fig. 12. Schematic of imaging experiment and experimental results. (a) Schematic of imaging scene; (b) original image of active millimeter wave imaging
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Table 1. Overall performance of SPDT and SP4T switches
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