COMPACT DUAL-BAND ANNULAR-RING SLOT ANTENNA WITH MEANDERED GROUNDED STRIP

Abstract

COMPACT DUAL-BAND ANNULAR-RING SLOTANTENNA WITH MEANDERED GROUNDED STRIPJ.-Y. SzeDepartment of Electrical and Electronic EngineeringChung Cheng Institute of TechnologyNational Defense University190 Sanyuan 1st. St., Dasi Township, Taoyuan County 33508, Taiwan,R.O.C.T.-H. Hu and T.-J. ChenDepartment of Electrical EngineeringDayeh University168 University Rd., Dacun, Changhua County 51591, Taiwan, R.O.C.Abstract|A compact dual-band annular-ring slot antenna (ARSA) isproposed for use in 2.4/5GHz wireless local-area networks (WLANs).With a meandered grounded strip embedded in the ring slot, threeresonant modes were excited. With a pair of notches properly etchedin the inner circular patch, the third resonant band was su–cientlylowered so that the second and third resonant bands are combinedto form a wider upper operating band. If scaled to the same loweroperating-band center frequency, the proposed ARSA measures only53.6% the area of a conventional microstrip-line-fed ARSA. Measuredand simulated results were found to agree reasonably well with eachother.1. INTRODUCTIONDue to the advantages of large impedance bandwidths and low proflles,printed slot antennas (PSAs) have received much attention in recentyears. Some PSAs were designed to generate circularly polarizedwaves with desired handed senses [1{3]; some were further enhancedin their bandwidths [4{6]; others were developed to support dual-band operations [7{17]. For those microstrip-line-fed PSAs designedfor dual-band operations, many of them are designed to cover the