Near-field microwave location of a spherical object

• Published in: Journal of communications technology & electronics Vol. 54; no. 3; pp. 259 - 269
• Main Authors: Galin, M. A., Reznik, A. N.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.03.2009; Springer Nature B.V
• Subjects: Antennas; Communications Engineering; Electrodynamics and Wave Propagation; Electromagnetism; Engineering; Investigations; Microwaves; Networks; Radiation; Studies; Tumors; 68.37.Uv; 84.40.Xb
• ISSN: 1064-2269; 1555-6557
• DOI: 10.1134/S1064226909030024

A theory of near-field (NF) location of a spherical object, which allows the recordable response of the NF locator (NFL) to be calculated for an arbitrary position of the object with respect to the antenna, has been developed. It is shown that the NFL response as a function of distance between the antenna and the sought object is characterized by two scales: quasi-static scale h qs and wave scale h w , with h w > h qs . Two-dimensional spatial distributions that are recorded by the NFL during scanning of the object are calculated. Specific features related to the excitation of the wave fields are discovered in these distributions. It has been found that the NFL resolution can be several times higher if the appropriate informative parameter is chosen. The prospects of detection of 3D contrast formations (tumors) in a human body with the aid of the NFL are studied. It is shown that tumors as small as 0.5–0.75 cm and located at a depth of up to 1 cm can be detected at optimized parameters of the device.