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 Journal of the Korean Institute of Electromagnetic and Science 2001;1(1):43-47.
 Compact Size Wideband Microstrip Antenna Element for Repeater and Base Stations at 2 GHz Young-Min Choi, Bom-son Lee Department of Radio Engineering, Kyunghee University Abstract A compact size microstrip antenna element using FR-4 substrate is proposed for use in repeater and base stations. Two stacked patches are aperture-coupled by two split feedlines. Rectangular stubs on the split feedlines are laid under the aperture and have the effect of considerably lowing the magnitude of $S_{11}$ [dB] and broadening impedance bandwidth. The designed structure has been fabricated and measured. Based on 20 dB, the return loss bandwidth is about 16.8% (1.86 GHz~2.20 GHz), which covers the frequency range assigned for IMT-2000 with a large margin. The overall dimension of the proposed antenna structure is 37 mm$times$41 mm$times$19mm (very compact). The antenna gain is more than 7.5 dBi over the required frequency range.

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