In this paper, efficient, high gain and pencil beam grid antenna array is proposed for hyperthermia breast cancer therapy system. The proposed
antenna bandwidth extends from 4.8 GHz to 4.9 GHz at resonant frequency of 4.86 GHz. This frequency band has been reported for
the breast cancer hyperthermia therapy. The grid long and short sides are responsible for
the undesired cross-polarized radiation and desired copolarized radiation,
respectively. The unsuitability of the conventional grid antenna array is
ensured by investigating its radiation properties. The proposed grid antenna
array short side width is varied and its long side width is kept wide as
possible to enhance the radiation properties and to reduce the losses. Also, a
reflector has been used for gain enhancement purpose. The proposed grid antenna array achieves side lobe level and 3 dB beam width of —27.9 dB and 25.9° for the E-plane and —27.9 dB and 26.3° for the H-plane, respectively. The breast phantom is irradiated by both proposed and conventional grid
antenna arrays for 10 minutes. The proposed grid antenna array achieves 8°C temperature increase within the breast phantom area compared to 2°C
temperature increase for conventional one. The proposed grid antenna array is highly efficient, high gain and light weight, and it has a very suitable
radiation property for hyperthermia breast
cancer therapy.
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