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A low‐profile wideband planar phased array of cavity‐backed slot microstrip elements for two‐dimensional beam scanning applications
Author(s) -
Yang YaBing,
Zhang FuShun,
Zhao JiaoCheng,
Liao Yuan,
Li Ning
Publication year - 2021
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32689
Subject(s) - phased array , wideband , microstrip , planar , materials science , optics , planar array , beam (structure) , substrate (aquarium) , microstrip antenna , optoelectronics , engineering , electrical engineering , physics , computer science , antenna (radio) , computer graphics (images) , oceanography , geology
A low‐profile wideband planar phased array, working in X band and with two‐dimensional (2‐D) beam scanning characteristic is presented. In order to meet the requirements of wideband 2‐D beam scanning and low‐profile performance, a cavity‐backed slot stacked microstrip element is introduced. The array element is mainly composed of the open‐ended microstrip line printed on the bottom substrate, which backed by a rectangular metal cavity, and dual layer patches etched on the middle substrate and the top substrate, respectively. A vertical transition structure is used to feed the microstrip line and connect the active T/R module, which is similar to the coaxial probe. The thickness of the proposed element is only 4.5 mm (0.12 λ L , λ L is the wavelength of the lowest frequency). Based on the simulated design, an 8 × 8 planar phased array prototype has been fabricated and measured. The experimental results show that the proposed array have achieved the maximum scanning angle of ±45° in the H ‐plane and ± 30° in the E ‐plane across the frequency range of 8 ~ 12 GHz. Therefore, the proposed array can be used as a sub‐array of larger low‐profile wideband phased arrays for 2‐D beam scanning applications, and also validate the introduced design concept.