A refrigerator comprising: a compressor configured to compress a refrigerant; an evaporator configured to perform heat exchange using the refrigerant compressed by the compressor ; a radio frequency (RF) output device configured to output a RF signal to the evaporator for removing frost on the evaporator ; wherein the RF output device comprises a first plate (AND) and a second plate (CAT), wherein the evaporator is positioned between the first plate (AND) and the second plate (CAT); wherein a height (ha) of the first plate (AND) and/or a height of the second plate (CAT) is less than a height of the evaporator ; and wherein the first plate (AND) and/or the second plate (CAT) is positioned at an area corresponding to the lower portion of the evaporator ; and a controller configured to control the RF output device , wherein the controller is configured to: based on the RF signal, control the frost to phase change into a liquid by heat radiated from a plurality of metal fins of the evaporator ; and after the phase change, control temperature of the phase changed liquid to increase by a water molecule movement based on the RF signal; and wherein the controller is configured to control the RF output device during a defrost section (t3). a compressor configured to compress a refrigerant; an evaporator configured to perform heat exchange using the refrigerant compressed by the compressor ; a radio frequency (RF) output device configured to output a RF signal to the evaporator for removing frost on the evaporator ; wherein the RF output device comprises a first plate (AND) and a second plate (CAT), wherein the evaporator is positioned between the first plate (AND) and the second plate (CAT); wherein a height (ha) of the first plate (AND) and/or a height of the second plate (CAT) is less than a height of the evaporator ; and wherein the first plate (AND) and/or the second plate (CAT) is positioned at an area corresponding to the lower portion of the evaporator ; and wherein the RF output device comprises a first plate (AND) and a second plate (CAT), wherein the evaporator is positioned between the first plate (AND) and the second plate (CAT); wherein a height (ha) of the first plate (AND) and/or a height of the second plate (CAT) is less than a height of the evaporator ; and wherein the first plate (AND) and/or the second plate (CAT) is positioned at an area corresponding to the lower portion of the evaporator ; and a controller configured to control the RF output device , wherein the controller is configured to: based on the RF signal, control the frost to phase change into a liquid by heat radiated from a plurality of metal fins of the evaporator ; and after the phase change, control temperature of the phase changed liquid to increase by a water molecule movement based on the RF signal; and based on the RF signal, control the frost to phase change into a liquid by heat radiated from a plurality of metal fins of the evaporator ; and after the phase change, control temperature of the phase changed liquid to increase by a water molecule movement based on the RF signal; and wherein the controller is configured to control the RF output device during a defrost section (t3). <EOS>