Phase Error Analysis of Discrete Dielectric Lens With Experimental Results at 94 GHz

被引:11
作者
Al-Nuaimi, Mustafa K. Taher [1 ]
Hong, Wei [1 ]
机构
[1] Southeast Univ, Sch Informat Sci & Engn, State Key Lab Millimeter Waves, Nanjing 210096, Jiangsu, Peoples R China
关键词
Aperture efficiency; lens antennas; phase error; BAND; ANTENNA; REFLECTARRAY; DESIGN; ARRAYS;
D O I
10.1109/TAP.2015.2456978
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper presents the phase error analysis of a single-layer discrete dielectric lens that uses nonresonant unit cell and can he fabricated using low-cost PCB technology. An extensive detailed study of the nonresonant unit cell is performed to understand the phase error loss mechanism and to find the best periodicity (unit cell size or interelement spacing) that produces almost the same phase response not only at different frequencies but also for both normal and oblique incidence which leads to lower oblique phase error (OPE) loss across the lens aperture and higher aperture efficiency. Unit cells of 0.47 lambda(94) (GHz), <= periodicity <= 0.68 lambda(94) (GHz) are studied and the optimum periodicity is addressed. Based on this study, three lenses of identical aperture area (100 x 100 x 6.35 mm(3)) but different unit cell sizes (0.5 lambda(94) (GHz), 0.53 lambda(94) (GHz), and 0.62 lambda(94) (GHz)) are designed, fabricated, and tested. It is found that the maximum OPE is reduced from about 65 degrees to less than 25 degrees, aperture efficiency is improved by about 13.4% at 94 GHz, and the total number of unit cells is reduced by about 42.6% when periodicity changed from 0.47 lambda(94) (GHz), to 0.62 lambda(94) (GHz), respectively. Furthermore, lens of 0.62 lambda(94) (GHz) periodicity will have the highest aperture efficiency of 48.7%, gain = 37.8 dB at 94 GHz, beamwidth approximate to 1.2 degrees, F/B ratio approximate to 37.5 dB, measured broken vertical bar S-11 broken vertical bar < -10 dB, cross-pol < -27 dB and otTers SLLH < -24.3 dB, and SLLE < -18.5 dB.
引用
收藏
页码:4400 / 4407
页数:8
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