Abstract
In this paper, a stacked patch antenna with UHF/ISM dual band was presented. The antenna is stacked in a dual-layer configuration that the lower-layer substrate is smaller than the upper-layer one, which can result in a reduced antenna Q quality factor. Two resistors having small resistance value are connected to a U-shaped and a rectangular patch, respectively. The two resistors have an effect on the impedance matching. Also, both contribute to extend the current path for lower frequency and bring an array-like current distribution having three array elements with a low mutual coupling. The U-shaped and rectangular patches mainly contribute to the lower frequency and higher frequency band, respectively. The electromagnetic coupling between the patches brings wideband and unique current mode. Simulations were conducted and shown that the |S <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> |<-10 dB frequency band is 0.83-0.9GHz and 2.3-2.6 GHz. The antenna gain can be up to 1.55 and 10.87 dBi for the lower and higher band, respectively, which demonstrates a high gain in the higher band. The antenna size is 0.21λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> ×0.19λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> ×0.016λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> , where λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> is the free-space wavelength at the lowest operation frequency. The antenna has a simple structure and is suitable for RFID applications at UHF and ISM band.
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