Investigation of Six Array Geometries for Focused Array Hyperthermia Applications

Abstract

Abstract-The focusing properties of six array configurations in the form of square, square with interlaced elements, square ring, cross (+) shape, cross (X) shape, and square ring plus diagonals shape arrays are investigated. The performance parameters, such as field distribution in the focal region, size of the focal spot, depth of field, level of field at focal point, and sidelobe structure, are compared. Computer simulations using MTALAB environment are performed in the investigations. The square ring and square ring plus diagonals configurations show favorable focusing properties. The resultant field patterns will help to find the arrays usefulness for hyperthermia and imaging applications.

Technologies for Near-Field Focused Microwave Antennas

“…All the considered arrays occupy an area of 4.5 × 4.5 , and the focal point is at 5 from the array surface. A similar numerical analysis can be found in [4] for additional array geometries.…”

“…The total size of the array is around 10 × 10 cm 2 , and it exhibits a peak of the electric field at around 15 cm from the antenna Figure 2: The −3 dB spot diameter (spot size in the transverse plane at the focal distance) as a function of the array size, / = / , for 0.1 < < 0.5 (see Figure 9 in [2]). The markers denote the performance of NFF arrays described in [4,7,8,12,15,16,20,22,33]; the circles and squares are related to simulated and measured results, respectively; for each referenced paper, the empty markers indicate results given by the authors and the filled markers are results extracted from figures. is the focal distance normalized to the radius of the far-field region boundary (2 2 / ).…”

A cubic dual band near‐field focused array antenna using composite right/left handed transmission lines

“…Figure 5a shows the circuit model of a dual-band CRLH transmission line applied. The parameters L L and C L are calculated by Equations ( 6) and (7). Equations (4), ( 5), ( 8)-( 13) are used for calculations of RH TL parameters (length and width of microstrip line).…”

“…2 NFF antennas have been widely used for medical applications, namely the wireless heart rate and respiration systems such as wireless non-contact detection of heartbeat and respiration 3 and remote sensing of heart rate, 4 vital life-detection systems such as non-contact vital sign monitoring system for ambulances, 5 the ventricular pressure monitoring systems such as pulse pressure monitoring through non-contact cardiac motion detection 6 and the cancerous tumors treatment systems to increase the temperature of the cancerous tissue such as microwave-induced hyperthermia. 7 They can be also used in many industrial applications such as soil moisture approximation by ground penetrating radar, 8 for X-band applications, non-contact industrial inspections, 9 the radiometric temperature to monitor the temperature of cooked meat products in the food industry as an alternative to infrared measurements, 10 reader antenna of radio frequency identification (RFID) system 11 and the wireless power transmission that has been proposed as a means to provide virtually continuous power without the use of transmission wires. Their application for wireless transmission can be divided into two terrestrial and space categories.…”

A Circular Array with Improved Focusing Properties

“…The elements of the arrays were placed in a cross, rectangular ring, and the conventional lattice, and the focusing properties of the three array geometries were compared. The focusing properties of six different array configurations in the form of a square, square with interlaced elements, square ring, cross (+) shape, cross (X) shape, and square ring plus diagonals shape arrays were investigated, and their performances were compared in [8]. The compared performance parameters were field distribution in the focal region, size of the focal spot, depth of field, level of the field at the focal point, and sidelobe structure.…”