《Table 1 Performance properties of the OLWAs with different gold layers and different mediums filled

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《基于四层等离子激元结构的椭球孔阵列光学漏波天线（英文）》

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where，FBLLis the maximum amplitude of the highest BL in three planes.By carefully observing Fig.5，for the TDSTA-air-OLWA，BLL is obtained as-1.2dB in the yz plane；but for the TDSTA-Si3N4-OLWA，it is-0.86dB in the xz plane.In the two OLWAs，the HPBWs in the three planes are calculated and given in Table.1.It is further found from Fig.5thatθ1dandθ2dare 70°（HPBW1）and 105°（HPBW3），respectively.By calculating Eq.（9），we obtain the directivity D as 5.61dBi in the TDSTA-Si3N4-OLWA.Similar，D is 4.47dBi in the TDSTA-air-OLWA，whereθ1d=98°andθ2d=94°.These results indicate that the TDSTA-air-OLWA has less BLL and better directivity than the TDSTA-Si3N4-OLWA.