本研究的目的為改變低溫共燒陶瓷的燒結溫度對於改變天線的性能影響，實驗中以Ba0.88(Nd1.40Bi0.42La0.30)Ti4O12,(B(NBL)T)微波介電陶瓷中添加55 vol.%鹼金族硼矽玻璃，以不同燒結溫度800℃至950℃，持溫時間30至90分鐘探討其介電性質，再以此材料作為基材與網印的銀膠線路共燒製成晶片天線後，分別以網路分析儀和無反射室量測其反射損失及場型。實驗結果發現，燒結溫度由800℃提升至950℃時，其介電常數由19.2提升至23.3，造成此現象是因B(NBL)T相溶解於玻璃造成結晶形態改變而提高其介電常數，此種因晶形改變而提高其介電常數現象嚴重發生在燒結溫度從800至850℃之間。此晶片天線具有7×4×1mm3微小型體積，因燒結溫度升高時提高介電常數造成天線中心頻率往低頻偏移，這種現象可用於控制天線因網卡外蓋高度不同所造成不同程度的中心頻率偏移，可將已偏離的中心頻率調整至可使用的範圍內，以符合藍芽及IEEE 802.11 b/g規範。

The main purpose of this research is to vary the antenna’s center frequency by using ceramic substrates of different dielectric constants for different environments. Microwave dielectric ceramic Ba0.88(Nd1.40Bi0.42La0.30)Ti4O12,(B(NBL)T) was mixed with 55 vol.% alkali-borosilicate glass as sintering additive then sintered at temperatures ranging from 800℃ to 950℃ for holding times ranging from 30 to 90 minutes, applied to investigate its dielectric properties. Subsequently, the composite was applied as antenna’s substrate that was co-fired with silver paste meander line, by screen printing. Its reflection loss and far-field patterns were then measured by network analyzer and Anechoic Chamber.
Increasing the sintering temperature from 800℃ to 950℃ varies the dielectric constant from 19.2 to 23.3. This phenomenon was caused by the dissolved of B(NBL)T phase in glass, resulting in the increase of dielectric constant due to the change of crystalline morphology, particularly from 800 to 850℃. This antenna has a size as small as 4.7x7x1 mm3. The center frequency shifted to lower one when the dielectric constant increases, which can be used to adjust the center frequency, which was affected by LAN card housing, and make it to fulfill Bluetooth and IEEE 802.11 b/g standards.

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