elliptical ring meaning in English

椭圆环
椭圆形隔框

To study the resonant characteristics of eccentric circular and concentric circular - elliptical ring microstrip antennas , the method , which is connected with the concentric ring microstrip antenna and based on the perturbation , is employed to calculate resonant wave numbers . comparisons of calculations with reference for the fundamental mode are also presented , agreement is very good for small eccentricity
为研究偏心圆环及同心圆-椭圆环微带天线的谐振特性，运用了一种以对同心圆环微扰为基础的计算方法，计算的谐振波数值与参考文献作了比较，在小偏心率的情况下，一致性很好。