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从具有介质覆盖层的微带电流元的Sommerfeld积分精确表达式出发,推导出了简单的近场近似公式。并将近似公式和计算积分的结果作了比较。近似公式适用于ρ/λ较小的情况,对介质层厚度和损耗没有限制。
Starting from the accurate expression of Sommerfeld integral of the microstrip current element with dielectric coating, a simple near-field approximation formula is deduced. The approximate formula is compared with the result of calculating the integral. The approximate formula is suitable for smaller ρ / λ, with no restrictions on the thickness and loss of the dielectric layer.