Electric-field distribution near rectangular microstrip radiators for hyperthermia heating: Theory versus experiment in water

Journal Article · Sat Feb 01 04:00:00 EST 1992 · IEEE Transactions on Bio-Medical Engineering (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/10.121645· OSTI ID:7174915

Underwood, H R ^[1]; Peterson, A F ^[2]; Magin, R L ^[3]

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1. Wheaton College, IL (United States)
2. Georgia Institute of Technology, Atlanta (United States)
3. University of Illinois, Urbana (United States)

A rectangular microstrip antenna radiator is investigated for its near-zone radiation characteristics in water. Calculations of a cavity model theory are compared with the electric-field measurements of a miniature nonperturbing diode dipole E-field probe whose 3 mm tip was positioned by an automatic three-axis scanning system. These comparisons have implications for the use of microstrip antennas in a multielement microwave hyperthermia applicator. Half-wavelength rectangular microstrip patches were designed to radiate in water at 915 MHz. Both low ([epsilon][sub r] = 10) and high ([epsilon][sub r] = 85) dielectric constant substrates were tested. Normal and tangential components of the near-zone radiated electric field were discriminated by appropriate orientation of the E-field probe. Low normal to transverse electric-field ratios ar 3.0 cm depth indicate that the radiators may be useful for hyperthermia heating with an intervening water bolus. Electric-field pattern addition from a three-element linear array of these elements in water indicates that phase and amplitude adjustment can achieve some limited control over the distribution of radiated power.

• OSTI ID: 7174915
• Journal Information: IEEE Transactions on Bio-Medical Engineering (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Bio-Medical Engineering (Institute of Electrical and Electronics Engineers); (United States) Vol. 39:2; ISSN IEBEAX; ISSN 0018-9294
• Country of Publication: United States
• Language: English

Related Subjects

560400* -- Other Environmental Pollutant Effects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
BODY TEMPERATURE
DISEASES
ELECTROMAGNETIC RADIATION
FREQUENCY RANGE
HYPERTHERMIA
MHZ RANGE
MHZ RANGE 100-1000
NEOPLASMS
RADIATIONS
THERAPY