- 标题
- 摘要
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- 实验方案
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Mm-Wave Beam-Steering Focal Plane Arrays with Microfluidically Switched Feed Networks
摘要： Micro?uidically switched feed networks are introduced to realize millimeter-wave beam-steering focal plane arrays (FPAs). Switching functionality is achieved by a selectively metallized plate (SMP) repositionable within a micro?uidic channel that is brought in close proximity to the microstrip line feed network of an FPA. The feed network is strategically designed to exhibit gap discontinuities that are sequentially overlapped by the SMP metallizations. The capacitive couplings between the SMP metallizations and the gap discontinuities are designed to achieve wideband (～20 GHz) switching functionality with low insertion loss (IL < 0.2 dB). Transmission line theory is utilized to demonstrate that the feed network offers 38% fractional bandwidth with ≤7 dB IL for linear arrays of 32 elements. This performance constitutes a signi?cant improvement over the recently reported resonant feed network based realization of micro?uidic beam-steering FPAs (MFPAs). Experimental veri?cation is carried out through the design and fabrication of a 30 GHz eight-element FPA. The FPA exhibits measured gains ranging between 20.2 and 22.6 dBi. Loss budget breakdown con?rms the low-loss performance of the micro?uidically switched feed networks (≤3 dB). The required micro?uidic actuation range is 4.2 mm and 10× lower than that of the prior work. This allows to achieve a faster beam-steering speed (0.27 s versus 5.25 s of previous designs). An integrated sensing approach for detecting the SMP position is also presented for the ?rst time to facilitate the use of presented MFPAs with closed-loop position control.
关键词： milimeter-wave,micro?uidics,focal plane arrays (FPAs),Ka-band,recon?gurable antenna,Beam-steering
更新于2025-09-23 15:21:01
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[IEEE NAECON 2018 - IEEE National Aerospace and Electronics Conference - Dayton, OH, USA (2018.7.23-2018.7.26)] NAECON 2018 - IEEE National Aerospace and Electronics Conference - Towards fabrication of mid-IR FPAs with enhanced sensitivity and reduced dark current by using integration with microspherical arrays
摘要： It was demonstrated previously that the efficiency of light collection by individual pixels of mid-wave infrared (MWIR) focal plane arrays (FPAs) can be enhanced by using dielectric microspheres, which provide concentration of light with large angle-of-view. This approach allows miniaturizing photodetector mesas to reduce their thermal current that, in turn, helps increasing the operating temperature of FPAs. In this work, we develop a technology of parallel integration of thousands of microspheres with the pixels. We fabricated microhole arrays and used them as suction grippers for microspheres. It is shown that in large-scale arrays formed by microspheres with several tenths microns in diameter, the fabrication errors below ~1% can be obtained. The fabrication errors can be significantly reduced in arrays formed by larger (>100 microns) microspheres.
关键词： Thermal (uncooled) IR detectors,Imaging,Infrared imaging,Focal plane arrays,Photodetectors
更新于2025-09-09 09:28:46
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Diffusive-Probabilistic Model for Inter-Pixel Crosstalk in HgCdTe Focal Plane Arrays
摘要： A closed-form probabilistic model for inter-pixel crosstalk in planar HgCdTe focal plane arrays is presented, providing simple expressions of crosstalk as function of device parameters like the pixel pitch, the absorber thickness, and the extension of the carrier depleted region. The method is effective in particular for performing parameter sensitivity studies on inter-pixel crosstalk, as an alternative to large-scale numerical simulations. The model is validated against three-dimensional combined optical and electrical numerical simulations, considering realistic, non-monochromatic illumination.
关键词： infrared detectors,crosstalk,non-monochromatic simulations,Focal plane arrays
更新于2025-09-04 15:30:14