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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >Millimeter-wave dielectric properties of single-crystal ferroelectric and dielectric materials
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Millimeter-wave dielectric properties of single-crystal ferroelectric and dielectric materials

机译：单晶铁电和介电材料的毫米波介电特性

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摘要

Transmittance measurements on various single crystal ferroelectric and dielectric materials, BaTiO3, SrTiO3, LiNbO3, LiTaO3, (PbMg1/3Nb2/3O3)0.73-(PbTiO3)0.27, LaAlO3, and Bi4Ge3O12,, over a broad millimeter-wave (MMW) frequency range have been performed. Frequency dependence of the complex dielectric permittivity has been measured in the MMW region using high-power sources for the first time, using a free-space, quasi-optical MMW spectrometer equipped with high-power backward wave oscillators (BWOs) as sources of coherent radiation, tunable in the range from 30 to 120 and 180 to 260 GHz. These results are compared with MMW permittivity of these materials obtained by other methods as well as to RF, microwave, and optical frequency permittivities for all the materials tested. The effects of both crystallographic orientation and quality of the surface polishing of the crystals have been examined. Uncertainties and possible sources of instrumentation and measurement errors related to the freespace MMW technique are discussed. This work demonstrates that precise MMW permittivity data can be obtained even on relatively small and thin crystals of different surface conditions and orientations using the high-power BWO-based quasioptical approach.
机译：在宽毫米波（MMW）频率范围内，对各种单晶铁电体和介电材料BaTiO3，SrTiO3，LiNbO3，LiTaO3，（PbMg1 / 3Nb2 / 3O3）0.73-（PbTiO3）0.27，LaAlO3和Bi4Ge3O12的透射率进行测量已经执行了。首次使用高功率源在MMW区域中测量了复介电常数的频率相关性，使用配备有高功率反向波振荡器（BWO）作为相干源的自由空间准光学MMW光谱仪辐射，可在30至120 GHz和180至260 GHz范围内可调。将这些结果与通过其他方法获得的这些材料的MMW介电常数以及所有测试材料的RF，微波和光频率介电常数进行比较。已经研究了晶体学取向和晶体表面抛光质量的影响。讨论了与自由空间MMW技术有关的不确定性以及可能出现的仪器和测量误差。这项工作表明，使用基于BWO的高功率准光学方法，即使在不同表面条件和取向的相对较小和较薄的晶体上，也可以获得精确的MMW介电常数数据。

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