| Summary: | Microstrip antennas are one ions in communication systems. However, microstrip antenna experiences imbalance impedance, which in turn affects the performance of the antenna with narrow bandwidth as well as reducing the radiation emission of the radio wave. Therefore, this paper presents are configuration method of impedance matching utilizing a ¼ λ transformer for a double stub feeding in microstrip antenna array. The double stub feeding is proposed for a dual-frequency band, in which at 2.4 GHz and 5.2 GHz, respectively with identical dimension of antenna patch elements. This proposed structure is placed on the main supply of the microstrip antenna, specifically to match the antenna impedance with the transmission line impedance. From the simulation results, the appropriate impedance (Z) parameter values of 52Ω at frequency of 2.4 GHz and 47Ωat 5.2 GHz were correspondingly obtained. The return loss (RL)of-34 dB at 2.4 GHz and-29 dBat 5.2 GHZ were also achieved. The voltage standing wave ratio(VSWR) has shown the best value of1.0 and 1.1 respectively at 2.4 GHz and 5.2 GHz. This antenna design has similar gain frequency capability as in the reference antenna that has been customized at a frequency of 5.8 GHz. Therefore, the proposed antenna can be used in Wireless Local-Area Network (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX) frequency bands.
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