An investigation was made into dielectric properties of quartz crystals, brown-clay, grey-clay, whitish-clay and some rocks found in Uganda under temperatures of about 25oC and pressure of approximately 66.0 cm of mercury. This study was conducted at Makerere University in Uganda some time back and revisited in 2009. The analysed materials were provided by the Department of Geology Entebbe, Ministry of Survey and Natural Resources Uganda. Measurements were carried out in the frequency range of 8.2-12.4 GHz, using circular cavities energized in the TM01n family of modes; the signal frequency had no effect on, n, as this was not in the axis of propagation. The relation D = cxn / (πfc √∈r) was used to calculate the dielectric constant ∈r for cut-off frequency fc, xn is the nth root of the first kind of the Bessel function J1(x) = 0 and c is the velocity of light. The study revealed that in Uganda there are: (i) crystals of dielectric constant 0r in the range ∈r = 4.48 - 4.57 and these values of ∈r are close to that of Piezo-electric crystal whose ∈r = 4.6, (ii) clays and black rock whose dielectric constants ∈r = 1. The study revealed that when a raw material is put in a cavity its dielectric constant can be determined by observing the resonance or (absorption frequency). Material with higher dielectric constants had correspondingly lower frequency than those with lower dielectric constants.
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机译：将研究进行了石英晶体，棕色粘土，灰色粘土，白色粘土的介电性质，在乌干达的温度下在约25oC和汞的压力下发现的一些岩石中发现的一些岩石。这项研究在乌干达的Makerere大学进行了一段时间，并于2009年重新审视。分析的材料由地质恩特贝，调查部和自然资源乌干达的地质部提供。测量在8.2-12.4GHz的频率范围内进行，使用在TM 01N 系列系列中激励的圆形腔;信号频率对N没有影响，N，因为这不是在传播轴上。关系d = cx n （πf c √∈ R ）来计算介电常数∈ r 对于截止频率f c ，x n 是第一种贝塞尔函数J 1的n th 根（x）= 0，c是光的速度。该研究表明，在乌干达中，存在：（i）介电常数0r的晶体在范围内∈ r = 4.48-4.57，这些值∈ r 接近该值压电晶体的∈<亚> r = 4.6，（ii）粘土和黑色岩石，其介电常数∈ r = 1。该研究表明，当原料放置时在腔中，可以通过观察谐振或（吸收频率）来确定其介电常数。具有较高介电常数的材料相应地低于具有较低介电常数的频率。
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