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A simple microwave moisture meter for grain was introduced to with reduction of size and volume of the instrument by means of 2 2 microstrip patch array antennas. The attenuation and phase shift produced by Korean short-grain rough rice, brown rice and barley were analyzed to estimate the relationships between moisture density in the grain and the attenuation and phase shift. Second and third-order polynomial attenuation models were a better measure of moisture density than were phase-shift models. A prototype grain moisture meter consisting of a 10.5 GHz oscillator, patch array antennas, isolator, detector and digital voltmeter provided a coefficient of determination, standard error of prediction (SEP) and bias of 0.975, 0.62% moisture content and 0.05% moisture content, respectively