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In this paper, a compact monopole microstrip antenna is presented for dual-band WLAN mobile modules operating in 2.4GHz and 5.2GHz bands. The proposed antenna design is based on direct connection of two separate microstrip resonators, one of which is in the form of spiral resonator loaded ring resonator while the other resonator is the conventional λ/4 L-shaped strip resonator. The overall size of the antenna is 0.08λ0 x 0.16λ0 at 2.4GHz resonance frequency. The reflection coefficient, S11 of the antenna is smaller than 10dB between 2.37GHz and 2.43GHz with 60MHz bandwidth in the lower frequency band, and between 5.01GHz and 5.41GHz with 400MHz bandwidth in the higher frequency band. The radiation efficiencies are 46%and 95% at 2.4GHz and 5.2GHz, respectively with the omnidirectional radiation pattern. The proposed antenna can be integrated into compact wireless modules operating 2.4GHz and 5.2

Compact WLAN Monopole Antenna with L-shaped Strip Line and Spiral Line Loaded Ring Resonator