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Analysis and Design of a Compact Dual-Band Directional Antenna

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4 Author(s)
XuLin Quan ; Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China ; RongLin Li ; YueHui Cui ; Tentzeris, M.M.

A new type of compact dual-band directional antenna is proposed for 2.4/5-GHz wireless access point and RFID reader applications. The dual-band antenna consists of a longer dipole for the lower band and a pair of shorter dipoles for the upper band. A simple coupling microstrip line is employed to excite the dipoles. Both the dual-band antenna and the feeding microstrip line are printed on the same substrate, leading to a fully planar structure. The length of the dipole for the lower band is shortened by a capacitive loading at each end of the dipole, offering a compact antenna configuration. The compact dual-band antenna achieves a desirable directional radiation pattern with an antenna gain of near 8 dBi for the lower band and 9-10 dBi for the upper band. An equivalent circuit analysis for the design of the dual-band directional antenna is presented.

Published in:

Antennas and Wireless Propagation Letters, IEEE  (Volume:11 )