Title :
Integrated multibeam dual-polarised planar array
Author :
Gao, S.C. ; Li, L.W. ; Leong, M.S. ; Yeo, T.S.
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore
fDate :
6/1/2001 12:00:00 AM
Abstract :
A novel four-beam dual-polarised microstrip antenna array at the 10 GHz band is presented. By using a multilayered structure and multiport slot-coupled microstrip lines, two Butler matrix microstrip circuits corresponding to two orthogonal polarisations can be located on different substrate layers (above and below the ground plane) and integrated with a patch array. The antenna has eight input ports corresponding to two orthogonal polarisations and four beams. The theoretical design is based on the finite-difference time-domain (FDTD) method. The measured return loss and isolation characteristics exceed 10 and 23 dB, respectively, in the 9.7-10.3 GHz band. The radiation pattern is close to an ideal Butler pattern and the cross-polarisation level is lower than -18 dB in the beams. Details of the antenna and its characteristics are presented
Keywords :
antenna radiation patterns; electromagnetic wave polarisation; finite difference time-domain analysis; microstrip antenna arrays; multibeam antennas; multiport networks; planar antenna arrays; 9.7 to 10.3 GHz; Butler matrix microstrip circuits; FDTD method; H-plane patterns; cross-polarisation level; finite-difference time-domain method; four-beam microstrip antenna array; ideal Butler pattern; integrated multibeam dual-polarised planar array; isolation characteristics; multilayered structure; multiport slot-coupled microstrip lines; orthogonal polarisations; patch array; radiation pattern; return loss; stacked microstrip patches; substrate layers;
Journal_Title :
Microwaves, Antennas and Propagation, IEE Proceedings
DOI :
10.1049/ip-map:20010497
