High-Gain Electrically Large Air-Cavity-Backed Patch Antenna Element and Array

IEEE Access

Wenfang Peng¹  Wenquan Cao¹  Zuping Qian¹ 

[1]Department of Communications Engineering, Army Engineering University of PLA, Nanjing, China

关键词: Array antenna;    differential feeding network;    electrically large property (ELP);    high-aperture efficiency;    high-gain;    high-order mode;   

DOI  :  10.1109/ACCESS.2018.2884029

来源: DOAJ

【 摘 要 】

In this paper, single high-gain patch antenna element with electrical large property (ELP) based on TM₃₀ mode is presented. Stable field distribution of the TM₃₀-mode is maintained by using one TE₂₀-mode substrate integrated waveguide (SIW) slot-coupling feed structure. Furthermore, air-cavitybacked structure and metal pins are introduced to expand the antenna bandwidth. The ELP element resonates at 22 GHz with simulated -10-dB impedance bandwidth of 6.9% and maximum gain of 14.2 dBi. Then, in order to correct the asymmetrical field distribution in TE₂₀-mode SIW, differential feed technology is introduced in the array design. The feeding network consists of two TE₁₀-TE₂₀ mode planar transducers and one anti-phase power divider. The working principle and design procedure of the ELP array are given in detail accordingly. Finally, a 2 × 2 ELP array is optimized and fabricated for verification. The measured results show that the array antenna has -10-dB impedance bandwidth of 9% and maximum gain of 18.9 dBi. Furthermore, it owns merit of excellent radiation performance with high aperture efficiency of about 90%.

【 授权许可】

Unknown