Gain optimization of a near-field focusing array for hyperthermia applications

Optimal Design of Focused Antenna Arrays

“…For noncontact microwave sensing, a narrow beam pattern is needed so that the radiated energy of antenna can be focused to a small spot for a precise sensing [10]- [12]. For a medical application such as microwave-induced hyperthermia, it is desired to maximize the power deposition at a prescribed spot to heat the unhealthy biological tissue [17], [18]. The focused antenna may also be used in the wireless power transmission systems [19]- [21].…”

Investigation of Six Array Geometries for Focused Array Hyperthermia Applications

“…One of the applications is into non-contact microwave sensing where a confined focused beam is needed for precise sensing in industrial [1] and ground penetration radar applications [2]. Microwave local hyperthermia has been an important theme in medical applications, where localizing power in the tumor region without overheating surrounding normal tissues is to be achieved [3][4][5][6]. Another development incentive of this kind of antennas comes from the concept of wireless power transmission [7].…”

Adaptive radiofrequency hyperthermia-phased array system for improved cancer therapy: phantom target measurements

“…Electromagnetic transmitting arrays in the frequency band 60-2000 MHz are used to localize heating of malignant tumors within a target body. Many studies have been conducted to produce improved therapeutic field distributions with hyperthermia phased arrays [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Phase control can be used to synthesize improved RF radiation patterns without adaptive control of the transmit-array weights (15)(16)(17)(18)(19)(20).…”

“…Phase control can be used to synthesize improved RF radiation patterns without adaptive control of the transmit-array weights (15)(16)(17)(18)(19)(20). Array transmit weights can be adaptively controlled to maximize the tumor temperature (or RF power delivered to the tumor) while minimizing the surrounding tissue temperature (or RF power delivered to the surrounding tissue) [21][22][23][24][25][26][27][28][29][30][31][32]. All other studies require invasive techniques to optimize the radiation pattern [21][22][23][24][25][26][27][28][29][30][31][32].…”

“…Array transmit weights can be adaptively controlled to maximize the tumor temperature (or RF power delivered to the tumor) while minimizing the surrounding tissue temperature (or RF power delivered to the surrounding tissue) [21][22][23][24][25][26][27][28][29][30][31][32]. All other studies require invasive techniques to optimize the radiation pattern [21][22][23][24][25][26][27][28][29][30][31][32]. A previous report [31 and several conference articles [4][5][6] investigate the theoretical benefit of using adaptive nulling with noninvasive auxiliary dipole sensors to reduce the field intensity at selected positions in the target body while maintaining a desired focus at a tumor.…”