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High Quality Factor, Ultralow Sintering Temperature Li6B4O9 Microwave Dielectric Ceramics with Ultralow Density for Antenna Substrates
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-07-16 00:00:00 , DOI: 10.1021/acssuschemeng.8b02755 Di Zhou 1, 2 , Li-Xia Pang 1, 3 , Da-Wei Wang 1 , Ze-Ming Qi 4 , Ian M. Reaney 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-07-16 00:00:00 , DOI: 10.1021/acssuschemeng.8b02755 Di Zhou 1, 2 , Li-Xia Pang 1, 3 , Da-Wei Wang 1 , Ze-Ming Qi 4 , Ian M. Reaney 1
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Dense Li6B4O9 microwave dielectric ceramics were synthesized at low temperature via solid-state reaction using Li2CO3 and LiBO2. Optimum permittivity ∼ 5.95, quality factor ∼ 41 800 GHz and temperature coefficient of resonant frequency ∼ – 72 ppm/°C were obtained in ceramics sintered at 640 °C with a ultrasmall bulk density ∼2.003 g/cm3 (∼95% relative density, the smallest among all the reported microwave dielectric ceramics). Li6B4O9 ceramics were shown to be chemically compatible with silver electrodes but reacted with aluminum forming Li3AlB2O6 and Li2AlBO4 secondary phases. A prototype patch antenna was fabricated by tape casting and screen printing. The antenna resonated at 4.255 GHz with a bandwidth ∼279 MHz at −10 dB transmission loss (S11) in agreement with simulated results. The Li6B4O9 microwave dielectric ceramic possesses similar microwave dielectric properties to the commercial materials but much lower density and could be a good candidate for both antenna substrate and low-temperature cofired ceramics technology.
中文翻译：
高品质因数，超低烧结温度Li 6 B 4 O 9天线基板用超低密度微波介电陶瓷
利用Li 2 CO 3和LiBO 2，通过固相反应在低温下合成了致密的Li 6 B 4 O 9微波介电陶瓷。在640°C烧结的陶瓷中，具有极小的堆积密度〜2.003 g / cm 3（相对密度〜95％），可获得最佳介电常数〜5.95，品质因数〜41 800 GHz和谐振频率的温度系数〜– 72 ppm /°C。，是所有已报道的微波介电陶瓷中最小的）。Li 6 B 4 O 9陶瓷与银电极化学相容，但与铝反应形成Li 3 AlB2 O 6和Li 2 AlBO 4次级相。原型贴片天线是通过流延和丝网印刷制成的。天线在4.255 GHz处以〜279 MHz的带宽在-10 dB的传输损耗（S 11）下谐振，与模拟结果一致。Li 6 B 4 O 9微波介电陶瓷具有与市售材料相似的微波介电性能，但密度低得多，并且可能是天线基板和低温共烧陶瓷技术的良好候选者。
更新日期：2018-07-16
中文翻译：
高品质因数，超低烧结温度Li 6 B 4 O 9天线基板用超低密度微波介电陶瓷
利用Li 2 CO 3和LiBO 2，通过固相反应在低温下合成了致密的Li 6 B 4 O 9微波介电陶瓷。在640°C烧结的陶瓷中，具有极小的堆积密度〜2.003 g / cm 3（相对密度〜95％），可获得最佳介电常数〜5.95，品质因数〜41 800 GHz和谐振频率的温度系数〜– 72 ppm /°C。，是所有已报道的微波介电陶瓷中最小的）。Li 6 B 4 O 9陶瓷与银电极化学相容，但与铝反应形成Li 3 AlB2 O 6和Li 2 AlBO 4次级相。原型贴片天线是通过流延和丝网印刷制成的。天线在4.255 GHz处以〜279 MHz的带宽在-10 dB的传输损耗（S 11）下谐振，与模拟结果一致。Li 6 B 4 O 9微波介电陶瓷具有与市售材料相似的微波介电性能，但密度低得多，并且可能是天线基板和低温共烧陶瓷技术的良好候选者。
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